diff --git a/.gitignore b/.gitignore
index 4dc88fb..9e9b000 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,39 +1,13 @@
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-#!.vscode/launch.json
-#!.vscode/extensions.json
-#!.vscode/*.code-snippets
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-# Go: https://github.com/github/gitignore/blob/e5323759e387ba347a9d50f8b0ddd16502eb71d4/Go.gitignore
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-#
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-vendor/
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index 0000000..54312d3
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..6558f01
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "acos"
+version = "0.1.0"
+edition = "2021"
+description = "An interactive CLI tool to retrieve and show your AWS costs"
+license = "Apache-2.0"
+
+[dependencies]
+aws-config = { version = "1", features = ["behavior-version-latest"] }
+aws-sdk-costexplorer = "1"
+aws-sdk-organizations = "1"
+aws-sdk-sts = "1"
+aws-sdk-iam = "1"
+tokio = { version = "1", features = ["full"] }
+clap = { version = "4", features = ["derive"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+chrono = { version = "0.4", features = ["serde"] }
+dialoguer = "0.11"
+comfy-table = "7"
+anyhow = "1"
diff --git a/Makefile b/Makefile
index 82e88a4..3298a79 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,4 @@
 BIN=acos
-#COMMIT_SHA=$(shell git rev-parse --short HEAD)
 
 .PHONY: help
 ## help: prints this help message
@@ -11,26 +10,33 @@ help:
 ## build: build the application
 build: clean
 	@echo "Building..."
-	@go build -o ./dist/${BIN} ./cmd/acos
+	@cargo build --release
+	@mkdir -p ./dist
+	@cp ./target/release/${BIN} ./dist/${BIN}
 
 .PHONY: run
-## run: runs go run ./cmd/acos
+## run: runs the application
 run:
-	go run -race ./cmd/acos
+	cargo run
 
 .PHONY: clean
 ## clean: cleans the binary
 clean:
 	@echo "Cleaning"
-	@go clean
+	@cargo clean
+	@rm -rf ./dist
 
-.PHONE: test
-## test: runs go test with default values
+.PHONY: test
+## test: runs tests
 test:
-	go test -v -count=1 -race ./...
+	cargo test
 
-.PHONY: setup
-## setup: setup go modules
-setup:
-	@go mod tidy \
-		&& go mod vendor
+.PHONY: fmt
+## fmt: formats the code
+fmt:
+	cargo fmt
+
+.PHONY: lint
+## lint: runs clippy linter
+lint:
+	cargo clippy -- -D warnings
diff --git a/README.md b/README.md
index cce05fb..4d93cba 100644
--- a/README.md
+++ b/README.md
@@ -21,25 +21,37 @@ With the `--ou` option, it requires `organizations:ListAccountsForParent` IAM pe
 
 ## Installation
 
+### From source
+
 ```shell
-$ go install github.com/toricls/acos/cmd/acos@latest
+$ cargo install --git https://github.com/toricls/acos
+```
+
+### Build locally
+
+```shell
+$ git clone https://github.com/toricls/acos.git
+$ cd acos
+$ make build
+$ ./dist/acos --help
 ```
 
 ## Usage
 
 ```shell
 $ acos --help
-Usage of acos:
-  -accountIds string
-    	Optional - Comma-separated AWS account IDs to retrieve costs. The interactive account selector is skipped when this flag is set.
-  -asOf string
-    	Optional - The date to retrieve the cost data. The format should be 'YYYY-MM-DD'. The default value is today in UTC.
-  -comparedTo string
-    	Optional - The cost of this month will be compared to either one of 'YESTERDAY' or 'LAST_WEEK'. This flag is ignored when the -json flag is set. (default "YESTERDAY")
-  -json
-    	Optional - Print JSON instead of a table.
-  -ou string
-    	Optional - The ID of an AWS Organizational Unit (OU) or Root to list direct-children AWS accounts. It must start with 'ou-' or 'r-' prefix. This flag is ignored when the -accountIds flag is set.
+An interactive CLI tool to retrieve and show your AWS costs
+
+Usage: acos [OPTIONS]
+
+Options:
+      --ou <OU>                  The ID of an AWS Organizational Unit (OU) or Root to list direct-children AWS accounts
+      --as-of <AS_OF>            The date to retrieve the cost data. The format should be 'YYYY-MM-DD'
+      --compared-to <COMPARED_TO>  The cost of this month will be compared to either 'YESTERDAY' or 'LAST_WEEK' [default: YESTERDAY]
+      --json                     Print JSON instead of table
+      --account-ids <ACCOUNT_IDS>  Comma-separated AWS account IDs to retrieve costs
+  -h, --help                     Print help
+  -V, --version                  Print version
 ```
 
 ### Accounts within AWS Organization
@@ -48,62 +60,60 @@ Usage of acos:
 $ acos
 ? Select accounts: 567890123456 - my-prod, 123456789012 - my-sandbox
 +--------------+--------------+----------------+------------------+----------------+
-|  ACCOUNT ID  | ACCOUNT NAME | THIS MONTH ($) | VS YESTERDAY ($) | LAST MONTH ($) |
+|  Account ID  | Account Name | This Month ($) | vs Yesterday ($) | Last Month ($) |
 +--------------+--------------+----------------+------------------+----------------+
 | 123456789012 | my-sandbox   |       0.038331 |       + 0.002255 |       0.127884 |
 | 567890123456 | my-prod      |    5820.334869 |     + 324.526062 |   10765.384186 |
 +--------------+--------------+----------------+------------------+----------------+
-|                       TOTAL |    5820.373201 |     + 324.528317 |   10765.512070 |
+|              | Total        |    5820.373201 |     + 324.528317 |   10765.512070 |
 +--------------+--------------+----------------+------------------+----------------+
 As of 2023-07-18.
 ```
 
 ### Accounts under specific AWS Organizational Unit (OU)
 
-Use `--ou` option to filter selectable AWS accounts by specific OU. Note that the `--ou` option is ignored when the `--accountIds` option is set.
-
-```shell
+Use `--ou` option to filter selectable AWS accounts by specific OU. Note that the `--ou` option is ignored when the `--account-ids` option is set.
 
 ```shell
 $ acos --ou ou-xxxx-12345678
 Retrieving AWS accounts under the OU 'ou-xxxx-12345678'...
 ? Select accounts: 234567890123 - my-dev, 123456789012 - my-sandbox
 +--------------+--------------+----------------+------------------+----------------+
-|  ACCOUNT ID  | ACCOUNT NAME | THIS MONTH ($) | VS YESTERDAY ($) | LAST MONTH ($) |
+|  Account ID  | Account Name | This Month ($) | vs Yesterday ($) | Last Month ($) |
 +--------------+--------------+----------------+------------------+----------------+
 | 123456789012 | my-sandbox   |       0.038331 |       + 0.002255 |       0.127884 |
 | 234567890123 | my-dev       |     420.102431 |      + 25.801012 |     980.440598 |
 +--------------+--------------+----------------+------------------+----------------+
-|                       TOTAL |     420.140762 |      + 25.803267 |     980.568482 |
+|              | Total        |     420.140762 |      + 25.803267 |     980.568482 |
 +--------------+--------------+----------------+------------------+----------------+
 As of 2023-07-18.
 ```
 
 ### Specific AWS accounts
 
-Use `--accountIds` option to retrieve costs for specific AWS accounts.
+Use `--account-ids` option to retrieve costs for specific AWS accounts.
 
 ```shell
-% ./dist/acos --accountIds 123456789012,567890123456
+$ acos --account-ids 123456789012,567890123456
 Account IDs specified. Retrieving accounts information...
 +--------------+--------------+----------------+------------------+----------------+
-|  ACCOUNT ID  | ACCOUNT NAME | THIS MONTH ($) | VS YESTERDAY ($) | LAST MONTH ($) |
+|  Account ID  | Account Name | This Month ($) | vs Yesterday ($) | Last Month ($) |
 +--------------+--------------+----------------+------------------+----------------+
 | 123456789012 | my-sandbox   |       0.038331 |       + 0.002255 |       0.127884 |
 | 567890123456 | my-prod      |    5820.334869 |     + 324.526062 |   10765.384186 |
 +--------------+--------------+----------------+------------------+----------------+
-|                       TOTAL |    5820.373201 |     + 324.528317 |   10765.512070 |
+|              | Total        |    5820.373201 |     + 324.528317 |   10765.512070 |
 +--------------+--------------+----------------+------------------+----------------+
 As of 2023-07-18.
 ```
 
-The `--json` option would be the best fit here because the `--accountIds` option skips the interactive account selector. You may use this combination of options to retrieve costs in a machine-readable format on a cron'd regular basis for example.
+The `--json` option would be the best fit here because the `--account-ids` option skips the interactive account selector. You may use this combination of options to retrieve costs in a machine-readable format on a cron'd regular basis for example.
 
 ```shell
-# Using --accountIds and --json options
-% ./dist/acos --accountIds 123456789012,567890123456 --json | jq .
+# Using --account-ids and --json options
+$ acos --account-ids 123456789012,567890123456 --json | jq .
 {
-  "AsOf": "2023-07-18T14:18:00.182227402Z",
+  "AsOf": "2023-07-18T00:00:00Z",
   "Costs": [
     {
       "AccountID": "123456789012",
@@ -127,7 +137,6 @@ The `--json` option would be the best fit here because the `--accountIds` option
 
 ## Todo
 
-- Add some tests
 - ~Support OU-based accounts listing~ done
 - ~Support command arguments~, configuration file, and/or env vars for repeated use
 - ~Support JSON format output for piped commands chaining~ done
diff --git a/cmd/acos/account.go b/cmd/acos/account.go
deleted file mode 100644
index 7e93ee6..0000000
--- a/cmd/acos/account.go
+++ /dev/null
@@ -1,158 +0,0 @@
-package main
-
-import (
-	"context"
-	"fmt"
-	"os"
-
-	"github.com/AlecAivazis/survey/v2"
-	"github.com/toricls/acos"
-)
-
-const ERR_AWS_ORGANIZATION_NOT_ENABLED = "This AWS account is not part of AWS Organizations organization. "
-const ERR_INFUFFICIENT_IAM_PERMISSIONS = "Failed to perform \"%s\".  Make sure you have sufficient IAM permissions. See https://github.com/toricls/acos#prerequisites for the details.\n"
-
-type GetAccountsOption struct {
-	AccountIds []string
-	OuId       string
-}
-
-// getAccounts returns a list of AWS accounts which the caller has access to.
-func getAccounts(ctx context.Context, opt GetAccountsOption) (acos.Accounts, error) {
-	var availableAccnts acos.Accounts
-	var err error
-
-	if len(opt.AccountIds) > 0 {
-		fmt.Fprintln(os.Stderr, "Account IDs specified. Retrieving accounts information...")
-		availableAccnts, err = getAccountsByIds(ctx, opt.AccountIds)
-		if !acos.IsOrganizationEnabled(err) {
-			fmt.Fprint(os.Stderr, ERR_AWS_ORGANIZATION_NOT_ENABLED)
-		} else if !acos.HasPermissionToOrganizationsApi(err) {
-			fmt.Fprintf(os.Stderr, ERR_INFUFFICIENT_IAM_PERMISSIONS, "organizations:ListAccounts")
-		}
-	} else if len(opt.OuId) > 0 {
-		fmt.Fprintf(os.Stderr, "Retrieving AWS accounts under the OU '%s'...\n", opt.OuId)
-		availableAccnts, err = getAccountsByOu(ctx, opt.OuId)
-		if !acos.OuExists(err) {
-			// To avoid duplicated error messages, we override the AWS error by our own.
-			err = fmt.Errorf("error the OU \"%s\" doesn't exist", opt.OuId)
-			// Stop the process here and we don't fall back to using the "getCallerAccount" func
-			// because the specified OU ID is not just valid.
-			return nil, err
-		} else if !acos.IsOrganizationEnabled(err) {
-			fmt.Fprint(os.Stderr, ERR_AWS_ORGANIZATION_NOT_ENABLED)
-		} else if !acos.HasPermissionToOrganizationsApi(err) {
-			fmt.Fprintf(os.Stderr, ERR_INFUFFICIENT_IAM_PERMISSIONS, "organizations:ListAccountsForParent")
-		}
-	} else {
-		availableAccnts, err = getAccountsInOrg(ctx)
-		if !acos.IsOrganizationEnabled(err) {
-			fmt.Fprint(os.Stderr, ERR_AWS_ORGANIZATION_NOT_ENABLED)
-		} else if !acos.HasPermissionToOrganizationsApi(err) {
-			fmt.Fprintf(os.Stderr, ERR_INFUFFICIENT_IAM_PERMISSIONS, "organizations:ListAccounts")
-		}
-	}
-
-	if err != nil {
-		fmt.Fprintln(os.Stderr, "Falling back to using \"sts:GetCallerIdentity\" and \"iam:ListAccountAliases\" to obtain your AWS account information... ")
-		availableAccnts, err = getCallerAccount(ctx)
-	}
-	return availableAccnts, err
-}
-
-func getAccountsByIds(ctx context.Context, accountIds []string) (acos.Accounts, error) {
-	accounts, err := acos.ListAccounts(ctx)
-	if err != nil {
-		return nil, err
-	}
-	availableAccnts := make(acos.Accounts, len(accountIds))
-	for _, id := range accountIds {
-		if len(id) == 0 {
-			continue
-		}
-		if a, ok := accounts[id]; ok {
-			availableAccnts[id] = acos.Account{
-				Id:   a.Id,
-				Name: a.Name,
-			}
-		} else {
-			fmt.Fprintf(os.Stderr, "Account ID '%s' is not found in your AWS organization\n", id)
-		}
-	}
-	return availableAccnts, nil
-}
-
-func getAccountsByOu(ctx context.Context, ouId string) (acos.Accounts, error) {
-	// Should regex the ouId before calling the API?
-	// Doc - https://docs.aws.amazon.com/organizations/latest/APIReference/API_ListAccountsForParent.html#organizations-ListAccountsForParent-request-ParentId
-	return acos.ListAccountsByOu(ctx, ouId)
-}
-
-func getAccountsInOrg(ctx context.Context) (acos.Accounts, error) {
-	return acos.ListAccounts(ctx)
-}
-
-// getCallerAccount returns the AWS account information of the caller.
-//
-// This function expects to be used when the caller is not part of AWS Organizations organization,
-// or when the caller doesn't have IAM permissions to perform "organizations:ListAccounts".
-func getCallerAccount(ctx context.Context) (acos.Accounts, error) {
-	accnt, err := acos.GetCallerAccount(ctx)
-	if err != nil {
-		return nil, err
-	}
-	acosAccounts := make(acos.Accounts)
-	acosAccounts[accnt[0]] = acos.Account{
-		Id:   &accnt[0],
-		Name: &accnt[1],
-	}
-	return acosAccounts, nil
-}
-
-// promptAccountsSelection prompts the user to select AWS accounts to retrieve costs.
-// It returns an error if the `accnts` arg doesn't contain any Account.
-// If the `accnts` arg contains only one Account, it never prompts the user.
-func promptAccountsSelection(accnts acos.Accounts) (acos.Accounts, error) {
-	if len(accnts) == 0 {
-		return nil, fmt.Errorf("error no accounts found")
-	} else if len(accnts) == 1 {
-		// No need to prompt the user to select accounts if there is only one account.
-		return accnts, nil
-	}
-
-	opts := make([]string, len(accnts))
-	accntIds := make([]string, len(accnts))
-	i := 0
-	for _, a := range accnts {
-		opts[i] = fmt.Sprintf("%s - %s", *a.Id, *a.Name)
-		accntIds[i] = *a.Id
-		i++
-	}
-	q := &survey.MultiSelect{
-		Message:  "Select accounts:",
-		Options:  opts,
-		PageSize: 10,
-	}
-
-	var selIdx []int
-	err := survey.AskOne(
-		q,
-		&selIdx,
-		survey.WithPageSize(10),
-		survey.WithKeepFilter(true), // Assuming people often use prefix/suffix to group related AWS account names like "myproduct-prod", "myproduct-dev".
-		survey.WithStdio(os.Stdin, os.Stderr, os.Stderr), // Use stderr for the prompt message to avoid messing up the JSON output.
-	)
-	if err != nil {
-		return nil, err
-	}
-	if len(selIdx) == 0 {
-		return nil, fmt.Errorf("error no accounts selected")
-	}
-
-	result := make(acos.Accounts)
-	for _, v := range selIdx {
-		accntId := accntIds[v]
-		result[accntId] = accnts[accntId]
-	}
-	return result, nil
-}
diff --git a/cmd/acos/account_test.go b/cmd/acos/account_test.go
deleted file mode 100644
index f0518f8..0000000
--- a/cmd/acos/account_test.go
+++ /dev/null
@@ -1,63 +0,0 @@
-package main
-
-import (
-	"reflect"
-	"testing"
-
-	"github.com/toricls/acos"
-)
-
-func toPointer(s string) *string {
-	return &s
-}
-
-func Test_selectAccounts(t *testing.T) {
-	type args struct {
-		accnts acos.Accounts
-	}
-	tests := []struct {
-		name    string
-		args    args
-		want    acos.Accounts
-		wantErr bool
-	}{
-		{
-			name: "error when empty accounts",
-			args: args{
-				accnts: acos.Accounts{},
-			},
-			want:    nil,
-			wantErr: true,
-		},
-		{
-			name: "no prompts when only one account",
-			args: args{
-				accnts: acos.Accounts{
-					"123456789012": acos.Account{
-						Id:   toPointer("123456789012"),
-						Name: toPointer("test"),
-					},
-				},
-			},
-			want: acos.Accounts{
-				"123456789012": acos.Account{
-					Id:   toPointer("123456789012"),
-					Name: toPointer("test"),
-				},
-			},
-			wantErr: false,
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			got, err := promptAccountsSelection(tt.args.accnts)
-			if (err != nil) != tt.wantErr {
-				t.Errorf("selectAccounts() error = %v, wantErr %v", err, tt.wantErr)
-				return
-			}
-			if !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("selectAccounts() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
diff --git a/cmd/acos/main.go b/cmd/acos/main.go
deleted file mode 100644
index 2610c79..0000000
--- a/cmd/acos/main.go
+++ /dev/null
@@ -1,155 +0,0 @@
-package main
-
-import (
-	"context"
-	"encoding/json"
-	"flag"
-	"fmt"
-	"os"
-	"sort"
-	"strings"
-	"time"
-
-	"github.com/olekukonko/tablewriter"
-
-	"github.com/toricls/acos"
-)
-
-func main() {
-	// Flags
-	var ouId, asOfStr, comparedTo, commaSeparatedAccountIds string
-	var useJson bool
-	flag.StringVar(&ouId, "ou", "", "Optional - The ID of an AWS Organizational Unit (OU) or Root to list direct-children AWS accounts. It must start with 'ou-' or 'r-' prefix. This flag is ignored when the -accountIds flag is set.")
-	flag.StringVar(&asOfStr, "asOf", "", "Optional - The date to retrieve the cost data. The format should be 'YYYY-MM-DD'. The default value is today in UTC.")
-	flag.StringVar(&comparedTo, "comparedTo", "YESTERDAY", "Optional - The cost of this month will be compared to either one of 'YESTERDAY' or 'LAST_WEEK'. This flag is ignored when the -json flag is set.")
-	flag.BoolVar(&useJson, "json", false, "Optional - Print JSON instead of table.")
-	flag.StringVar(&commaSeparatedAccountIds, "accountIds", "", "Optional - Comma-separated AWS account IDs to retrieve costs. The interactive account selector is skipped when this flag is set.")
-	flag.Parse()
-
-	var asOf time.Time
-	if len(asOfStr) > 0 {
-		if t, err := time.Parse("2006-01-02", asOfStr); err != nil {
-			fmt.Fprintln(os.Stderr, "error invalid date format for the --asOf flag. It should be 'YYYY-MM-DD'.")
-			os.Exit(1)
-		} else {
-			asOf = t
-		}
-	} else {
-		asOf = time.Now().UTC()
-	}
-
-	switch comparedTo {
-	case "YESTERDAY":
-	case "LAST_WEEK":
-		break
-	default:
-		fmt.Fprintln(os.Stderr, "error invalid value for the -comparedTo flag. It should be either 'YESTERDAY' or 'LAST_WEEK'.")
-		os.Exit(2)
-	}
-
-	var accountIds []string
-	if len(commaSeparatedAccountIds) > 0 {
-		accountIds = strings.Split(commaSeparatedAccountIds, ",")
-	}
-
-	// Choose AWS accounts to show costs
-	ctx := context.Background()
-	var candidateAccounts, selectedAccounts acos.Accounts
-	var err error
-	candidateAccounts, err = getAccounts(ctx, GetAccountsOption{
-		AccountIds: accountIds,
-		OuId:       ouId,
-	})
-	if err != nil {
-		fmt.Fprintln(os.Stderr, err.Error())
-		os.Exit(3)
-	}
-	if len(accountIds) > 0 {
-		// Skip the interactive account selector when the -accountIds flag is set.
-		selectedAccounts = candidateAccounts
-	} else {
-		selectedAccounts, err = promptAccountsSelection(candidateAccounts)
-	}
-	if err != nil {
-		fmt.Fprintln(os.Stderr, err.Error())
-		os.Exit(4)
-	}
-
-	// Get costs
-	var costs acos.Costs
-	if costs, err = acos.GetCosts(ctx, selectedAccounts, acos.NewGetCostsOption(asOf)); err != nil {
-		fmt.Fprintln(os.Stderr, err.Error())
-		os.Exit(5)
-	}
-
-	// Sort map keys by AWS Account ID
-	keys := make([]string, 0, len(costs))
-	for k := range costs {
-		keys = append(keys, k)
-	}
-	sort.Strings(keys)
-	// Map to array
-	costArray := make([]acos.Cost, 0, len(costs))
-	for _, k := range keys {
-		costArray = append(costArray, (costs)[k])
-	}
-
-	if useJson {
-		if err := printJson(costArray, asOf); err != nil {
-			fmt.Fprintln(os.Stderr, err.Error())
-			os.Exit(6)
-		}
-	} else {
-		// Print table
-		printTable(costArray, comparedTo, asOf)
-	}
-}
-
-func printJson(costs []acos.Cost, asOf time.Time) error {
-	jsonStr, err := json.Marshal(struct {
-		AsOf  time.Time
-		Costs []acos.Cost
-	}{asOf, costs})
-	if err != nil {
-		return err
-	}
-	fmt.Println(string(jsonStr))
-	return nil
-}
-
-func printTable(costs []acos.Cost, comparedTo string, asOf time.Time) {
-	t := tablewriter.NewWriter(os.Stdout)
-	incrHeaderTxt := "vs Yesterday ($)"
-	if comparedTo == "LAST_WEEK" {
-		incrHeaderTxt = "vs Last Week ($)"
-	}
-	t.SetHeader([]string{"Account ID", "Account Name", "This Month ($)", incrHeaderTxt, "Last Month ($)"})
-	t.SetColumnAlignment([]int{tablewriter.ALIGN_LEFT, tablewriter.ALIGN_LEFT, tablewriter.ALIGN_RIGHT, tablewriter.ALIGN_RIGHT, tablewriter.ALIGN_RIGHT})
-	totalThisMonth, totalIncrease, totalLastMonth := 0.0, 0.0, 0.0
-	for _, c := range costs {
-		thisMonth := fmt.Sprintf("%f", c.AmountThisMonth)
-		incr := c.LatestDailyCostIncrease
-		if comparedTo == "LAST_WEEK" {
-			incr = c.LatestWeeklyCostIncrease
-		}
-		incrStr := fmt.Sprintf("%s %f", getAmountPrefix(incr), incr)
-		lastMonth := fmt.Sprintf("%f", c.AmountLastMonth)
-		t.Append([]string{c.AccountID, c.AccountName, thisMonth, incrStr, lastMonth})
-		totalThisMonth += c.AmountThisMonth
-		totalIncrease += incr
-		totalLastMonth += c.AmountLastMonth
-	}
-	t.SetFooter([]string{"", "Total", fmt.Sprintf("%f", totalThisMonth), fmt.Sprintf("%s %f", getAmountPrefix(totalIncrease), totalIncrease), fmt.Sprintf("%f", totalLastMonth)})
-	t.SetFooterAlignment(tablewriter.ALIGN_RIGHT)
-	t.SetCaption(true, fmt.Sprintf("As of %s.", asOf.Format("2006-01-02")))
-	t.Render()
-}
-
-func getAmountPrefix(amount float64) string {
-	if amount > 0.0 {
-		return "+"
-	} else if amount < 0.0 {
-		return "-"
-	}
-	return ""
-}
diff --git a/config.go b/config.go
deleted file mode 100644
index e706ade..0000000
--- a/config.go
+++ /dev/null
@@ -1,19 +0,0 @@
-package acos
-
-import (
-	"context"
-	"log"
-
-	"github.com/aws/aws-sdk-go-v2/aws"
-	"github.com/aws/aws-sdk-go-v2/config"
-)
-
-var cfg aws.Config
-
-func init() {
-	var err error
-	cfg, err = config.LoadDefaultConfig(context.TODO())
-	if err != nil {
-		log.Fatalf("unable to load AWS SDK config, %v", err)
-	}
-}
diff --git a/cost.go b/cost.go
deleted file mode 100644
index 559b2a6..0000000
--- a/cost.go
+++ /dev/null
@@ -1,252 +0,0 @@
-package acos
-
-import (
-	"context"
-	"fmt"
-	"strconv"
-	"time"
-
-	"github.com/aws/aws-sdk-go-v2/aws"
-
-	"github.com/aws/aws-sdk-go-v2/service/costexplorer"
-	"github.com/aws/aws-sdk-go-v2/service/costexplorer/types"
-)
-
-type CeGetCostAndUsageAPI interface {
-	GetCostAndUsage(ctx context.Context, params *costexplorer.GetCostAndUsageInput, optFns ...func(*costexplorer.Options)) (*costexplorer.GetCostAndUsageOutput, error)
-}
-
-var (
-	// AWS clients
-	ceClient CeGetCostAndUsageAPI
-)
-
-func init() {
-	ceClient = costexplorer.NewFromConfig(cfg)
-}
-
-const (
-	ceDataGranularity = "DAILY"
-	ceCostMetric      = "UnblendedCost"
-	ceCostGroupBy     = "LINKED_ACCOUNT"
-)
-
-// AcosGetCostsOption represents options for GetCosts. The default values are:
-// - ExcludeCredit : true
-// - ExcludeUpfront: true
-// - ExcludeRefund : false
-// - ExcludeSupport: false
-type AcosGetCostsOption struct {
-	ExcludeCredit  bool
-	ExcludeUpfront bool
-	ExcludeRefund  bool
-	ExcludeSupport bool
-
-	// acos requires the following dates to show - THIS_MONTH, vs YESTERDAY, vs LAST_WEEK, and LAST_MONTH
-	dates struct {
-		asOf                string
-		oneWeekAgo          string
-		firstDayOfLastMonth string
-		firstDayOfThisMonth string // Just for flagging within the sum-up logic
-	}
-}
-
-func NewGetCostsOption(asOfInUTC time.Time) AcosGetCostsOption {
-	opt := AcosGetCostsOption{
-		ExcludeCredit:  true,
-		ExcludeUpfront: true,
-		ExcludeRefund:  false,
-		ExcludeSupport: false,
-	}
-
-	oneWeekAgo := asOfInUTC.Add(time.Duration(-7) * 24 * time.Hour)
-	year, month, _ := asOfInUTC.Date()
-	firstDayOfThisMonth := time.Date(year, month, 1, 0, 0, 0, 0, asOfInUTC.Location())
-	firstDayOfLastMonth := time.Date(year, month-1, 1, 0, 0, 0, 0, asOfInUTC.Location())
-
-	dateFmt := "2006-01-02" // Use the same format as the AWS API response, "types.ResultByTime.TimePeriod.Start/End".
-	opt.dates.asOf = asOfInUTC.Format(dateFmt)
-	opt.dates.oneWeekAgo = oneWeekAgo.Format(dateFmt)
-	opt.dates.firstDayOfThisMonth = firstDayOfThisMonth.Format(dateFmt)
-	opt.dates.firstDayOfLastMonth = firstDayOfLastMonth.Format(dateFmt)
-	return opt
-}
-
-// Cost represents a cost for a given account.
-type Cost struct {
-	AccountID                string
-	AccountName              string
-	LatestDailyCostIncrease  float64
-	LatestWeeklyCostIncrease float64
-	AmountLastMonth          float64
-	AmountThisMonth          float64
-}
-
-// Costs represents a map of Cost. The map key is the account ID of the respective Cost.
-type Costs map[string]Cost // map[accountId]Cost
-
-// Group wraps up AWS Organization Group struct.
-type Group types.Group
-
-func (g *Group) getAccountId() string {
-	return g.Keys[0]
-}
-
-func (g *Group) getAmount() float64 {
-	if f, err := strconv.ParseFloat(*g.Metrics[ceCostMetric].Amount, 32); err == nil {
-		return f
-	}
-	// TODO: debug log the error
-	return 0
-}
-
-// GetCosts returns the costs for given accounts.
-// It raises an error when the `accounts` arg doesn't contain any account.
-func GetCosts(ctx context.Context, accounts Accounts, opt AcosGetCostsOption) (Costs, error) {
-	accountIds := accounts.AccountIds()
-	if len(accountIds) == 0 {
-		return nil, fmt.Errorf("error no account to retrieve cost: GetCosts requires at least one account in Accounts")
-	}
-	ceOpt := acosOptToCostExplorerOpt(opt, accountIds)
-
-	// The following GetCostAndUsage API won't return any result in some cases (e.g. when the account is newly created).
-	// We create and fill the result map with the account IDs and names first, and then fill the amount later,
-	// to make sure the result map always contains all the accounts.
-	costs := make(map[string]Cost)
-	for _, a := range accounts {
-		costs[*a.Id] = Cost{
-			AccountID:                *a.Id,
-			AccountName:              *a.Name,
-			LatestDailyCostIncrease:  0,
-			LatestWeeklyCostIncrease: 0,
-			AmountLastMonth:          0,
-			AmountThisMonth:          0,
-		}
-	}
-
-	var nextToken *string
-	for {
-		ceOpt.NextPageToken = nextToken
-
-		out, err := ceClient.GetCostAndUsage(ctx, &ceOpt)
-		if err != nil {
-			return nil, err
-		}
-
-		thisMonth := false
-		lastWeek := false
-		for _, r := range out.ResultsByTime {
-
-			if *r.TimePeriod.Start == opt.dates.firstDayOfThisMonth {
-				// We assume that the AWS API returns sorted "out.ResultsByTime" slice items
-				// by "r.TimePeriod.Start".
-				// So we can assume that the rest of the items are also for this month, when
-				// the "r.TimePeriod.Start" equals to the "first day of this month".
-				//
-				// See the official doc for more details about the response data structure:
-				// https://docs.aws.amazon.com/aws-cost-management/latest/APIReference/API_GetCostAndUsage.html#API_GetCostAndUsage_ResponseSyntax
-				thisMonth = true
-			}
-			// Flag "lastWeek" if the first week has passed of this month.
-			if thisMonth && *r.TimePeriod.Start == opt.dates.oneWeekAgo {
-				lastWeek = true
-			}
-
-			for _, g := range r.Groups {
-				grp := Group(g)
-				accntId := grp.getAccountId()
-				amount := grp.getAmount()
-
-				c := costs[accntId]
-				if thisMonth {
-					c.AmountThisMonth += amount
-				} else {
-					c.AmountLastMonth += amount
-				}
-
-				// Store yesterday's cost as the "latest daily cost increase".
-				//
-				// The types.ResultByTime item, that represents yesterday's cost, should has
-				// today's date in "r.TimePeriod.End", and yesterday's date in "r.TimePeriod.Start".
-				// We only check the "r.TimePeriod.End" value here, because we we called the AWS API
-				// with the "DAILY" granularity.
-				if *r.TimePeriod.End == opt.dates.asOf {
-					if opt.dates.asOf != opt.dates.firstDayOfThisMonth { // Unless today is the first day of month.
-						c.LatestDailyCostIncrease = amount
-					}
-				}
-
-				// Add the cost onto the "latest weekly cost increase".
-				if lastWeek {
-					c.LatestWeeklyCostIncrease += amount
-				}
-
-				costs[accntId] = c
-			}
-		}
-
-		nextToken = out.NextPageToken
-		if nextToken == nil {
-			break
-		}
-	}
-
-	return costs, nil
-}
-
-// acosOptToCostExplorerOpt returns the AWS Cost Explorer's GetCostAndUsageInput param built from the acos options.
-func acosOptToCostExplorerOpt(opt AcosGetCostsOption, accountIds []string) costexplorer.GetCostAndUsageInput {
-	// Base input parameter
-	in := costexplorer.GetCostAndUsageInput{
-		Granularity: ceDataGranularity,
-		Metrics:     []string{ceCostMetric},
-		TimePeriod: &types.DateInterval{
-			// Get the cost for the last month and this month
-			Start: aws.String(opt.dates.firstDayOfLastMonth),
-			End:   aws.String(opt.dates.asOf),
-		},
-		GroupBy: []types.GroupDefinition{
-			{
-				Type: types.GroupDefinitionTypeDimension,
-				Key:  aws.String(ceCostGroupBy),
-			},
-		},
-		Filter: &types.Expression{
-			And: []types.Expression{
-				{
-					Dimensions: &types.DimensionValues{
-						Key:    ceCostGroupBy,
-						Values: accountIds,
-					},
-				},
-			},
-		},
-	}
-
-	// Exclude options
-	v := []string{}
-	if opt.ExcludeCredit {
-		v = append(v, "Credit")
-	}
-	if opt.ExcludeUpfront {
-		v = append(v, "Upfront")
-	}
-	if opt.ExcludeRefund {
-		v = append(v, "Refund")
-	}
-	if opt.ExcludeSupport {
-		v = append(v, "Support")
-	}
-	if len(v) > 0 {
-		in.Filter.And = append(in.Filter.And, types.Expression{
-			Not: &types.Expression{
-				Dimensions: &types.DimensionValues{
-					Key:    "RECORD_TYPE",
-					Values: v,
-				},
-			},
-		})
-	}
-
-	return in
-}
diff --git a/cost_test.go b/cost_test.go
deleted file mode 100644
index 50ec7c5..0000000
--- a/cost_test.go
+++ /dev/null
@@ -1,115 +0,0 @@
-package acos
-
-import (
-	"context"
-	"reflect"
-	"testing"
-	"time"
-
-	"github.com/aws/aws-sdk-go-v2/service/costexplorer"
-	"github.com/aws/aws-sdk-go-v2/service/costexplorer/types"
-)
-
-func TestGetCosts(t *testing.T) {
-	type args struct {
-		ctx      context.Context
-		accounts Accounts
-		opt      AcosGetCostsOption
-	}
-	tests := []struct {
-		name    string
-		args    args
-		want    Costs
-		wantErr bool
-	}{
-		{
-			name: "error when empty accounts",
-			args: args{
-				ctx:      context.Background(),
-				accounts: Accounts{},
-				opt:      NewGetCostsOption(time.Now().UTC()),
-			},
-			want:    nil,
-			wantErr: true,
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			got, err := GetCosts(tt.args.ctx, tt.args.accounts, tt.args.opt)
-			if (err != nil) != tt.wantErr {
-				t.Errorf("GetCosts() error = %v, wantErr %v", err, tt.wantErr)
-				return
-			}
-			if !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("GetCosts() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
-
-type mockGetCostAndUsageAPI func(ctx context.Context, params *costexplorer.GetCostAndUsageInput, optFns ...func(*costexplorer.Options)) (*costexplorer.GetCostAndUsageOutput, error)
-
-func (m mockGetCostAndUsageAPI) GetCostAndUsage(ctx context.Context, params *costexplorer.GetCostAndUsageInput, optFns ...func(*costexplorer.Options)) (*costexplorer.GetCostAndUsageOutput, error) {
-	return m(ctx, params, optFns...)
-}
-
-func TestWithMock_GetCosts(t *testing.T) {
-	ceClient = mockGetCostAndUsageAPI(func(ctx context.Context, params *costexplorer.GetCostAndUsageInput, optFns ...func(*costexplorer.Options)) (*costexplorer.GetCostAndUsageOutput, error) {
-		t.Helper()
-		out := &costexplorer.GetCostAndUsageOutput{
-			ResultsByTime:            []types.ResultByTime{},
-			GroupDefinitions:         []types.GroupDefinition{},
-			DimensionValueAttributes: []types.DimensionValuesWithAttributes{},
-		}
-		return out, nil
-	})
-
-	type args struct {
-		ctx      context.Context
-		accounts Accounts
-		opt      AcosGetCostsOption
-	}
-	tests := []struct {
-		name    string
-		args    args
-		want    Costs
-		wantErr bool
-	}{
-		{
-			name: "selected account must exists in result", // even GetCostAndUsage API returns no result. This is because newly created account has no billed cost in most cases.
-			args: args{
-				ctx: context.Background(),
-				accounts: Accounts{
-					"123456789012": Account{
-						Id:   toPointer("123456789012"),
-						Name: toPointer("test"),
-					},
-				},
-				opt: NewGetCostsOption(time.Now().UTC()),
-			},
-			want: Costs{
-				"123456789012": Cost{
-					AccountID:                "123456789012",
-					AccountName:              "test",
-					LatestDailyCostIncrease:  0,
-					LatestWeeklyCostIncrease: 0,
-					AmountLastMonth:          0,
-					AmountThisMonth:          0,
-				},
-			},
-			wantErr: false,
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			got, err := GetCosts(tt.args.ctx, tt.args.accounts, tt.args.opt)
-			if (err != nil) != tt.wantErr {
-				t.Errorf("GetCosts() error = %v, wantErr %v", err, tt.wantErr)
-				return
-			}
-			if !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("GetCosts() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
diff --git a/go.mod b/go.mod
deleted file mode 100644
index 6172cd2..0000000
--- a/go.mod
+++ /dev/null
@@ -1,35 +0,0 @@
-module github.com/toricls/acos
-
-go 1.20
-
-require (
-	github.com/AlecAivazis/survey/v2 v2.3.6
-	github.com/aws/aws-sdk-go-v2 v1.19.0
-	github.com/aws/aws-sdk-go-v2/config v1.18.28
-	github.com/aws/aws-sdk-go-v2/service/costexplorer v1.25.13
-	github.com/aws/aws-sdk-go-v2/service/iam v1.21.1
-	github.com/aws/aws-sdk-go-v2/service/organizations v1.19.9
-	github.com/aws/aws-sdk-go-v2/service/sts v1.19.3
-	github.com/olekukonko/tablewriter v0.0.5
-)
-
-require (
-	github.com/aws/aws-sdk-go-v2/credentials v1.13.27 // indirect
-	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.13.5 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.35 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.29 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/ini v1.3.36 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.29 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.12.13 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.14.13 // indirect
-	github.com/aws/smithy-go v1.13.5 // indirect
-	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
-	github.com/mattn/go-colorable v0.1.2 // indirect
-	github.com/mattn/go-isatty v0.0.8 // indirect
-	github.com/mattn/go-runewidth v0.0.9 // indirect
-	github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b // indirect
-	github.com/stretchr/testify v1.7.2 // indirect
-	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
-	golang.org/x/term v0.0.0-20210503060354-a79de5458b56 // indirect
-	golang.org/x/text v0.3.8 // indirect
-)
diff --git a/go.sum b/go.sum
deleted file mode 100644
index 78b5d65..0000000
--- a/go.sum
+++ /dev/null
@@ -1,79 +0,0 @@
-github.com/AlecAivazis/survey/v2 v2.3.6 h1:NvTuVHISgTHEHeBFqt6BHOe4Ny/NwGZr7w+F8S9ziyw=
-github.com/AlecAivazis/survey/v2 v2.3.6/go.mod h1:4AuI9b7RjAR+G7v9+C4YSlX/YL3K3cWNXgWXOhllqvI=
-github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2 h1:+vx7roKuyA63nhn5WAunQHLTznkw5W8b1Xc0dNjp83s=
-github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2/go.mod h1:HBCaDeC1lPdgDeDbhX8XFpy1jqjK0IBG8W5K+xYqA0w=
-github.com/aws/aws-sdk-go-v2 v1.19.0 h1:klAT+y3pGFBU/qVf1uzwttpBbiuozJYWzNLHioyDJ+k=
-github.com/aws/aws-sdk-go-v2 v1.19.0/go.mod h1:uzbQtefpm44goOPmdKyAlXSNcwlRgF3ePWVW6EtJvvw=
-github.com/aws/aws-sdk-go-v2/config v1.18.28 h1:TINEaKyh1Td64tqFvn09iYpKiWjmHYrG1fa91q2gnqw=
-github.com/aws/aws-sdk-go-v2/config v1.18.28/go.mod h1:nIL+4/8JdAuNHEjn/gPEXqtnS02Q3NXB/9Z7o5xE4+A=
-github.com/aws/aws-sdk-go-v2/credentials v1.13.27 h1:dz0yr/yR1jweAnsCx+BmjerUILVPQ6FS5AwF/OyG1kA=
-github.com/aws/aws-sdk-go-v2/credentials v1.13.27/go.mod h1:syOqAek45ZXZp29HlnRS/BNgMIW6uiRmeuQsz4Qh2UE=
-github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.13.5 h1:kP3Me6Fy3vdi+9uHd7YLr6ewPxRL+PU6y15urfTaamU=
-github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.13.5/go.mod h1:Gj7tm95r+QsDoN2Fhuz/3npQvcZbkEf5mL70n3Xfluc=
-github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.35 h1:hMUCiE3Zi5AHrRNGf5j985u0WyqI6r2NULhUfo0N/No=
-github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.35/go.mod h1:ipR5PvpSPqIqL5Mi82BxLnfMkHVbmco8kUwO2xrCi0M=
-github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.29 h1:yOpYx+FTBdpk/g+sBU6Cb1H0U/TLEcYYp66mYqsPpcc=
-github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.29/go.mod h1:M/eUABlDbw2uVrdAn+UsI6M727qp2fxkp8K0ejcBDUY=
-github.com/aws/aws-sdk-go-v2/internal/ini v1.3.36 h1:8r5m1BoAWkn0TDC34lUculryf7nUF25EgIMdjvGCkgo=
-github.com/aws/aws-sdk-go-v2/internal/ini v1.3.36/go.mod h1:Rmw2M1hMVTwiUhjwMoIBFWFJMhvJbct06sSidxInkhY=
-github.com/aws/aws-sdk-go-v2/service/costexplorer v1.25.13 h1:8ni3fNbaB68IQkiaxRRcp84xbj+8IFI279obk4Y80bY=
-github.com/aws/aws-sdk-go-v2/service/costexplorer v1.25.13/go.mod h1:xwe/PIa8Vj9cPclzL+WwslzsY2VCc8RJTaPaGBTbSVk=
-github.com/aws/aws-sdk-go-v2/service/iam v1.21.1 h1:VTCWgsrromZqnlRgfziqqWWcW7LFkQLwJVYgf/5zgWA=
-github.com/aws/aws-sdk-go-v2/service/iam v1.21.1/go.mod h1:LBsjrFczXiQLASO6FtDGTeHuZh6oHuIH6VKaOozFghg=
-github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.29 h1:IiDolu/eLmuB18DRZibj77n1hHQT7z12jnGO7Ze3pLc=
-github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.29/go.mod h1:fDbkK4o7fpPXWn8YAPmTieAMuB9mk/VgvW64uaUqxd4=
-github.com/aws/aws-sdk-go-v2/service/organizations v1.19.9 h1:zGbv0aBHnx6LAZeClqK9fpO1C8IIGyToP0u62pEQiBA=
-github.com/aws/aws-sdk-go-v2/service/organizations v1.19.9/go.mod h1:OvoCgJ4TLrd6ADYbUcWMc58RfeY6SM/2V1l5WqTkQUs=
-github.com/aws/aws-sdk-go-v2/service/sso v1.12.13 h1:sWDv7cMITPcZ21QdreULwxOOAmE05JjEsT6fCDtDA9k=
-github.com/aws/aws-sdk-go-v2/service/sso v1.12.13/go.mod h1:DfX0sWuT46KpcqbMhJ9QWtxAIP1VozkDWf8VAkByjYY=
-github.com/aws/aws-sdk-go-v2/service/ssooidc v1.14.13 h1:BFubHS/xN5bjl818QaroN6mQdjneYQ+AOx44KNXlyH4=
-github.com/aws/aws-sdk-go-v2/service/ssooidc v1.14.13/go.mod h1:BzqsVVFduubEmzrVtUFQQIQdFqvUItF8XUq2EnS8Wog=
-github.com/aws/aws-sdk-go-v2/service/sts v1.19.3 h1:e5mnydVdCVWxP+5rPAGi2PYxC7u2OZgH1ypC114H04U=
-github.com/aws/aws-sdk-go-v2/service/sts v1.19.3/go.mod h1:yVGZA1CPkmUhBdA039jXNJJG7/6t+G+EBWmFq23xqnY=
-github.com/aws/smithy-go v1.13.5 h1:hgz0X/DX0dGqTYpGALqXJoRKRj5oQ7150i5FdTePzO8=
-github.com/aws/smithy-go v1.13.5/go.mod h1:Tg+OJXh4MB2R/uN61Ko2f6hTZwB/ZYGOtib8J3gBHzA=
-github.com/creack/pty v1.1.17 h1:QeVUsEDNrLBW4tMgZHvxy18sKtr6VI492kBhUfhDJNI=
-github.com/creack/pty v1.1.17/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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diff --git a/organization.go b/organization.go
deleted file mode 100644
index 6428a2f..0000000
--- a/organization.go
+++ /dev/null
@@ -1,100 +0,0 @@
-package acos
-
-import (
-	"context"
-	"errors"
-
-	"github.com/aws/aws-sdk-go-v2/service/organizations"
-	"github.com/aws/aws-sdk-go-v2/service/organizations/types"
-)
-
-var (
-	// AWS clients
-	organizationsClient *organizations.Client
-)
-
-func init() {
-	organizationsClient = organizations.NewFromConfig(cfg)
-}
-
-// Account wraps up AWS Organization Account struct.
-type Account types.Account
-
-type Accounts map[string]Account // map[accountId]Account
-
-// AccountIds returns a list of account IDs.
-func (a *Accounts) AccountIds() []string {
-	accountIds := make([]string, len(*a))
-	i := 0
-	for key := range *a {
-		accountIds[i] = key
-		i++
-	}
-	return accountIds
-}
-
-// ListAccounts returns a list of AWS accounts within an AWS Organization organization.
-func ListAccounts(ctx context.Context) (Accounts, error) {
-	var nextToken *string
-	accnts := make(map[string]Account)
-	for {
-		out, err := organizationsClient.ListAccounts(
-			ctx,
-			&organizations.ListAccountsInput{
-				NextToken: nextToken,
-			},
-		)
-		if err != nil {
-			return nil, err
-		}
-		for _, acc := range out.Accounts {
-			accnts[*acc.Id] = Account(acc)
-		}
-		nextToken = out.NextToken
-		if nextToken == nil {
-			break
-		}
-	}
-	return accnts, nil
-}
-
-// ListAccountsByOu returns a list of direct-children AWS accounts of an AWS Organization OU.
-func ListAccountsByOu(ctx context.Context, ouId string) (Accounts, error) {
-	var nextToken *string
-	accnts := make(map[string]Account)
-	for {
-		out, err := organizationsClient.ListAccountsForParent(
-			ctx,
-			&organizations.ListAccountsForParentInput{
-				ParentId:  &ouId,
-				NextToken: nextToken,
-			},
-		)
-		if err != nil {
-			return nil, err
-		}
-		for _, acc := range out.Accounts {
-			accnts[*acc.Id] = Account(acc)
-		}
-		nextToken = out.NextToken
-		if nextToken == nil {
-			break
-		}
-	}
-	return accnts, nil
-}
-
-func IsOrganizationEnabled(err error) bool {
-	var errType *types.AWSOrganizationsNotInUseException
-	return !errors.As(err, &errType)
-}
-
-func HasPermissionToOrganizationsApi(err error) bool {
-	var errType *types.AccessDeniedException
-	return !errors.As(err, &errType)
-}
-
-func OuExists(err error) bool {
-	var errType *types.ParentNotFoundException
-	return !errors.As(err, &errType)
-}
diff --git a/organization_test.go b/organization_test.go
deleted file mode 100644
index 17ce7ba..0000000
--- a/organization_test.go
+++ /dev/null
@@ -1,41 +0,0 @@
-package acos
-
-import (
-	"reflect"
-	"testing"
-)
-
-func toPointer(s string) *string {
-	return &s
-}
-
-func TestAccounts_AccountIds(t *testing.T) {
-	tests := []struct {
-		name string
-		a    *Accounts
-		want []string
-	}{
-		{
-			name: "empty",
-			a:    &Accounts{},
-			want: []string{},
-		},
-		{
-			name: "one",
-			a: &Accounts{
-				"123456789012": Account{
-					Id:   toPointer("123456789012"),
-					Name: toPointer("test"),
-				},
-			},
-			want: []string{"123456789012"},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if got := tt.a.AccountIds(); !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("Accounts.GetAccountIds() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..ec9d23d
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,6 @@
+use aws_config::SdkConfig;
+
+/// Load the default AWS SDK configuration.
+pub async fn load_aws_config() -> SdkConfig {
+    aws_config::load_defaults(aws_config::BehaviorVersion::latest()).await
+}
diff --git a/src/cost.rs b/src/cost.rs
new file mode 100644
index 0000000..522f2a2
--- /dev/null
+++ b/src/cost.rs
@@ -0,0 +1,247 @@
+use std::collections::HashMap;
+
+use anyhow::{bail, Result};
+use aws_sdk_costexplorer::types::{
+    DateInterval, DimensionValues, Expression, GroupDefinition, GroupDefinitionType,
+};
+use aws_sdk_costexplorer::Client as CeClient;
+use chrono::{Datelike, NaiveDate};
+use serde::Serialize;
+
+use crate::organization::{Accounts, AccountsExt};
+
+const CE_DATA_GRANULARITY: aws_sdk_costexplorer::types::Granularity =
+    aws_sdk_costexplorer::types::Granularity::Daily;
+const CE_COST_METRIC: &str = "UnblendedCost";
+const CE_COST_GROUP_BY: &str = "LINKED_ACCOUNT";
+
+/// Options for GetCosts.
+#[derive(Debug, Clone)]
+pub struct GetCostsOption {
+    pub exclude_credit: bool,
+    pub exclude_upfront: bool,
+    pub exclude_refund: bool,
+    pub exclude_support: bool,
+
+    pub as_of: String,
+    pub one_week_ago: String,
+    pub first_day_of_last_month: String,
+    pub first_day_of_this_month: String,
+}
+
+impl GetCostsOption {
+    pub fn new(as_of_date: NaiveDate) -> Self {
+        let one_week_ago = as_of_date - chrono::Duration::days(7);
+        let first_day_of_this_month =
+            NaiveDate::from_ymd_opt(as_of_date.year(), as_of_date.month(), 1).unwrap();
+
+        let (prev_year, prev_month) = if as_of_date.month() == 1 {
+            (as_of_date.year() - 1, 12)
+        } else {
+            (as_of_date.year(), as_of_date.month() - 1)
+        };
+        let first_day_of_last_month = NaiveDate::from_ymd_opt(prev_year, prev_month, 1).unwrap();
+
+        let fmt = "%Y-%m-%d";
+        Self {
+            exclude_credit: true,
+            exclude_upfront: true,
+            exclude_refund: false,
+            exclude_support: false,
+            as_of: as_of_date.format(fmt).to_string(),
+            one_week_ago: one_week_ago.format(fmt).to_string(),
+            first_day_of_this_month: first_day_of_this_month.format(fmt).to_string(),
+            first_day_of_last_month: first_day_of_last_month.format(fmt).to_string(),
+        }
+    }
+}
+
+/// Represents a cost for a given account.
+#[derive(Debug, Clone, Serialize)]
+pub struct Cost {
+    #[serde(rename = "AccountID")]
+    pub account_id: String,
+    #[serde(rename = "AccountName")]
+    pub account_name: String,
+    #[serde(rename = "LatestDailyCostIncrease")]
+    pub latest_daily_cost_increase: f64,
+    #[serde(rename = "LatestWeeklyCostIncrease")]
+    pub latest_weekly_cost_increase: f64,
+    #[serde(rename = "AmountLastMonth")]
+    pub amount_last_month: f64,
+    #[serde(rename = "AmountThisMonth")]
+    pub amount_this_month: f64,
+}
+
+/// A map of account ID -> Cost.
+pub type Costs = HashMap<String, Cost>;
+
+/// Get costs for the given accounts.
+pub async fn get_costs(
+    client: &CeClient,
+    accounts: &Accounts,
+    opt: &GetCostsOption,
+) -> Result<Costs> {
+    let account_ids = accounts.account_ids();
+    if account_ids.is_empty() {
+        bail!("error no account to retrieve cost: GetCosts requires at least one account in Accounts");
+    }
+
+    // Initialize costs map with all accounts (some may have no billing data yet)
+    let mut costs: Costs = HashMap::new();
+    for (id, acc) in accounts {
+        costs.insert(
+            id.clone(),
+            Cost {
+                account_id: acc.id.clone(),
+                account_name: acc.name.clone(),
+                latest_daily_cost_increase: 0.0,
+                latest_weekly_cost_increase: 0.0,
+                amount_last_month: 0.0,
+                amount_this_month: 0.0,
+            },
+        );
+    }
+
+    let ce_input = build_cost_explorer_input(opt, &account_ids);
+
+    let mut next_token: Option<String> = None;
+    loop {
+        let mut req = client
+            .get_cost_and_usage()
+            .granularity(CE_DATA_GRANULARITY)
+            .set_metrics(Some(vec![CE_COST_METRIC.to_string()]))
+            .time_period(ce_input.time_period.clone())
+            .set_group_by(Some(ce_input.group_by.clone()))
+            .set_filter(Some(ce_input.filter.clone()));
+
+        if let Some(token) = &next_token {
+            req = req.next_page_token(token);
+        }
+
+        let output = req.send().await?;
+
+        let mut this_month = false;
+        let mut last_week = false;
+
+        for r in output.results_by_time() {
+            let period = r.time_period().unwrap();
+            let start = period.start();
+            let end = period.end();
+
+            if start == opt.first_day_of_this_month {
+                this_month = true;
+            }
+            if this_month && start == opt.one_week_ago {
+                last_week = true;
+            }
+
+            for g in r.groups() {
+                let account_id = g.keys().first().map(|s| s.as_str()).unwrap_or_default();
+                let amount: f64 = g
+                    .metrics()
+                    .and_then(|m| m.get(CE_COST_METRIC))
+                    .and_then(|v| v.amount())
+                    .and_then(|a| a.parse::<f64>().ok())
+                    .unwrap_or(0.0);
+
+                if let Some(c) = costs.get_mut(account_id) {
+                    if this_month {
+                        c.amount_this_month += amount;
+                    } else {
+                        c.amount_last_month += amount;
+                    }
+
+                    // Yesterday's cost
+                    if end == opt.as_of && opt.as_of != opt.first_day_of_this_month {
+                        c.latest_daily_cost_increase = amount;
+                    }
+
+                    // Weekly cost increase
+                    if last_week {
+                        c.latest_weekly_cost_increase += amount;
+                    }
+                }
+            }
+        }
+
+        next_token = output.next_page_token().map(|s| s.to_string());
+        if next_token.is_none() {
+            break;
+        }
+    }
+
+    Ok(costs)
+}
+
+struct CeInput {
+    time_period: DateInterval,
+    group_by: Vec<GroupDefinition>,
+    filter: Expression,
+}
+
+fn build_cost_explorer_input(opt: &GetCostsOption, account_ids: &[String]) -> CeInput {
+    let time_period = DateInterval::builder()
+        .start(&opt.first_day_of_last_month)
+        .end(&opt.as_of)
+        .build()
+        .unwrap();
+
+    let group_by = vec![GroupDefinition::builder()
+        .r#type(GroupDefinitionType::Dimension)
+        .key(CE_COST_GROUP_BY)
+        .build()];
+
+    // Build filter: account IDs AND exclude record types
+    let account_filter = Expression::builder()
+        .dimensions(
+            DimensionValues::builder()
+                .key(aws_sdk_costexplorer::types::Dimension::LinkedAccount)
+                .set_values(Some(account_ids.to_vec()))
+                .build(),
+        )
+        .build();
+
+    let mut and_expressions = vec![account_filter];
+
+    // Exclude record types
+    let mut exclude_values = Vec::new();
+    if opt.exclude_credit {
+        exclude_values.push("Credit".to_string());
+    }
+    if opt.exclude_upfront {
+        exclude_values.push("Upfront".to_string());
+    }
+    if opt.exclude_refund {
+        exclude_values.push("Refund".to_string());
+    }
+    if opt.exclude_support {
+        exclude_values.push("Support".to_string());
+    }
+
+    if !exclude_values.is_empty() {
+        let exclude_expr = Expression::builder()
+            .not(
+                Expression::builder()
+                    .dimensions(
+                        DimensionValues::builder()
+                            .key(aws_sdk_costexplorer::types::Dimension::RecordType)
+                            .set_values(Some(exclude_values))
+                            .build(),
+                    )
+                    .build(),
+            )
+            .build();
+        and_expressions.push(exclude_expr);
+    }
+
+    let filter = Expression::builder()
+        .set_and(Some(and_expressions))
+        .build();
+
+    CeInput {
+        time_period,
+        group_by,
+        filter,
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..e86e06c
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,354 @@
+mod config;
+mod cost;
+mod organization;
+mod sts;
+
+use std::io::Write;
+use std::process;
+
+use anyhow::Result;
+use aws_sdk_costexplorer::Client as CeClient;
+use aws_sdk_iam::Client as IamClient;
+use aws_sdk_organizations::Client as OrganizationsClient;
+use aws_sdk_sts::Client as StsClient;
+use chrono::NaiveDate;
+use clap::Parser;
+use comfy_table::{Attribute, Cell, CellAlignment, ContentArrangement, Table};
+use dialoguer::MultiSelect;
+use serde::Serialize;
+
+use cost::{Cost, GetCostsOption};
+use organization::{Account, Accounts};
+
+const ERR_AWS_ORGANIZATION_NOT_ENABLED: &str =
+    "This AWS account is not part of AWS Organizations organization. ";
+const ERR_INSUFFICIENT_IAM_PERMISSIONS: &str =
+    "Failed to perform \"{}\".  Make sure you have sufficient IAM permissions. See https://github.com/toricls/acos#prerequisites for the details.";
+
+/// An interactive CLI tool to retrieve and show your AWS costs.
+#[derive(Parser, Debug)]
+#[command(name = "acos", version, about)]
+struct Cli {
+    /// The ID of an AWS Organizational Unit (OU) or Root to list direct-children AWS accounts.
+    /// It must start with 'ou-' or 'r-' prefix. This flag is ignored when --account-ids is set.
+    #[arg(long = "ou", default_value = "")]
+    ou: String,
+
+    /// The date to retrieve the cost data. The format should be 'YYYY-MM-DD'.
+    /// The default value is today in UTC.
+    #[arg(long = "as-of", default_value = "")]
+    as_of: String,
+
+    /// The cost of this month will be compared to either one of 'YESTERDAY' or 'LAST_WEEK'.
+    /// This flag is ignored when --json is set.
+    #[arg(long = "compared-to", default_value = "YESTERDAY")]
+    compared_to: String,
+
+    /// Print JSON instead of table.
+    #[arg(long = "json", default_value_t = false)]
+    json: bool,
+
+    /// Comma-separated AWS account IDs to retrieve costs.
+    /// The interactive account selector is skipped when this flag is set.
+    #[arg(long = "account-ids", default_value = "")]
+    account_ids: String,
+}
+
+#[tokio::main]
+async fn main() {
+    if let Err(e) = run().await {
+        eprintln!("{}", e);
+        process::exit(1);
+    }
+}
+
+async fn run() -> Result<()> {
+    let cli = Cli::parse();
+
+    // Parse as_of date
+    let as_of = if cli.as_of.is_empty() {
+        chrono::Utc::now().date_naive()
+    } else {
+        match NaiveDate::parse_from_str(&cli.as_of, "%Y-%m-%d") {
+            Ok(d) => d,
+            Err(_) => {
+                eprintln!(
+                    "error invalid date format for the --as-of flag. It should be 'YYYY-MM-DD'."
+                );
+                process::exit(1);
+            }
+        }
+    };
+
+    // Validate compared_to
+    match cli.compared_to.as_str() {
+        "YESTERDAY" | "LAST_WEEK" => {}
+        _ => {
+            eprintln!("error invalid value for the --compared-to flag. It should be either 'YESTERDAY' or 'LAST_WEEK'.");
+            process::exit(2);
+        }
+    }
+
+    // Parse account IDs
+    let account_ids: Vec<String> = if cli.account_ids.is_empty() {
+        vec![]
+    } else {
+        cli.account_ids
+            .split(',')
+            .map(|s| s.trim().to_string())
+            .filter(|s| !s.is_empty())
+            .collect()
+    };
+
+    // Load AWS config and create clients
+    let aws_cfg = config::load_aws_config().await;
+    let org_client = OrganizationsClient::new(&aws_cfg);
+    let sts_client = StsClient::new(&aws_cfg);
+    let iam_client = IamClient::new(&aws_cfg);
+    let ce_client = CeClient::new(&aws_cfg);
+
+    // Get candidate accounts
+    let candidate_accounts = get_accounts(
+        &org_client,
+        &sts_client,
+        &iam_client,
+        &account_ids,
+        &cli.ou,
+    )
+    .await?;
+
+    // Select accounts
+    let selected_accounts = if !account_ids.is_empty() {
+        // Skip interactive selector when account IDs are explicitly provided
+        candidate_accounts
+    } else {
+        prompt_accounts_selection(&candidate_accounts)?
+    };
+
+    // Get costs
+    let opt = GetCostsOption::new(as_of);
+    let costs = cost::get_costs(&ce_client, &selected_accounts, &opt).await?;
+
+    // Sort by account ID
+    let mut cost_array: Vec<Cost> = costs.into_values().collect();
+    cost_array.sort_by(|a, b| a.account_id.cmp(&b.account_id));
+
+    if cli.json {
+        print_json(&cost_array, &as_of)?;
+    } else {
+        print_table(&cost_array, &cli.compared_to, &as_of);
+    }
+
+    Ok(())
+}
+
+async fn get_accounts(
+    org_client: &OrganizationsClient,
+    sts_client: &StsClient,
+    iam_client: &IamClient,
+    account_ids: &[String],
+    ou_id: &str,
+) -> Result<Accounts> {
+    let result = if !account_ids.is_empty() {
+        eprintln!("Account IDs specified. Retrieving accounts information...");
+        get_accounts_by_ids(org_client, account_ids).await
+    } else if !ou_id.is_empty() {
+        eprintln!(
+            "Retrieving AWS accounts under the OU '{}'...",
+            ou_id
+        );
+        let r = organization::list_accounts_by_ou(org_client, ou_id).await;
+        if let Err(ref e) = r {
+            if organization::ou_not_found(e) {
+                anyhow::bail!("error the OU \"{}\" doesn't exist", ou_id);
+            }
+        }
+        r
+    } else {
+        organization::list_accounts(org_client).await
+    };
+
+    match result {
+        Ok(accounts) => Ok(accounts),
+        Err(ref e) => {
+            if organization::is_organization_not_enabled(e) {
+                eprint!("{}", ERR_AWS_ORGANIZATION_NOT_ENABLED);
+            } else if organization::has_no_permission_to_organizations_api(e) {
+                eprintln!(
+                    "{}",
+                    ERR_INSUFFICIENT_IAM_PERMISSIONS.replace("{}", "organizations:ListAccounts")
+                );
+            }
+            eprintln!("Falling back to using \"sts:GetCallerIdentity\" and \"iam:ListAccountAliases\" to obtain your AWS account information... ");
+            get_caller_account(sts_client, iam_client).await
+        }
+    }
+}
+
+async fn get_accounts_by_ids(
+    org_client: &OrganizationsClient,
+    account_ids: &[String],
+) -> Result<Accounts> {
+    let all_accounts = organization::list_accounts(org_client).await?;
+    let mut result = Accounts::new();
+
+    for id in account_ids {
+        if id.is_empty() {
+            continue;
+        }
+        if let Some(acc) = all_accounts.get(id) {
+            result.insert(id.clone(), acc.clone());
+        } else {
+            eprintln!("Account ID '{}' is not found in your AWS organization", id);
+        }
+    }
+
+    Ok(result)
+}
+
+async fn get_caller_account(sts_client: &StsClient, iam_client: &IamClient) -> Result<Accounts> {
+    let (account_id, account_name) = sts::get_caller_account(sts_client, iam_client).await?;
+    let mut accounts = Accounts::new();
+    accounts.insert(
+        account_id.clone(),
+        Account {
+            id: account_id,
+            name: account_name,
+        },
+    );
+    Ok(accounts)
+}
+
+fn prompt_accounts_selection(accounts: &Accounts) -> Result<Accounts> {
+    if accounts.is_empty() {
+        anyhow::bail!("error no accounts found");
+    }
+
+    if accounts.len() == 1 {
+        return Ok(accounts.clone());
+    }
+
+    // Sort accounts for consistent ordering
+    let mut sorted_accounts: Vec<(&String, &Account)> = accounts.iter().collect();
+    sorted_accounts.sort_by_key(|(id, _)| id.to_string());
+
+    let options: Vec<String> = sorted_accounts
+        .iter()
+        .map(|(_, acc)| format!("{} - {}", acc.id, acc.name))
+        .collect();
+
+    let selections = MultiSelect::new()
+        .with_prompt("Select accounts")
+        .items(&options)
+        .interact_on(&dialoguer::console::Term::stderr())?;
+
+    if selections.is_empty() {
+        anyhow::bail!("error no accounts selected");
+    }
+
+    let mut result = Accounts::new();
+    for idx in selections {
+        let (id, acc) = &sorted_accounts[idx];
+        result.insert(id.to_string(), (*acc).clone());
+    }
+
+    Ok(result)
+}
+
+#[derive(Serialize)]
+struct JsonOutput {
+    #[serde(rename = "AsOf")]
+    as_of: String,
+    #[serde(rename = "Costs")]
+    costs: Vec<Cost>,
+}
+
+fn print_json(costs: &[Cost], as_of: &NaiveDate) -> Result<()> {
+    let output = JsonOutput {
+        as_of: format!("{}T00:00:00Z", as_of.format("%Y-%m-%d")),
+        costs: costs.to_vec(),
+    };
+    let json_str = serde_json::to_string(&output)?;
+    println!("{}", json_str);
+    Ok(())
+}
+
+fn print_table(costs: &[Cost], compared_to: &str, as_of: &NaiveDate) {
+    let incr_header = if compared_to == "LAST_WEEK" {
+        "vs Last Week ($)"
+    } else {
+        "vs Yesterday ($)"
+    };
+
+    let mut table = Table::new();
+    table.set_content_arrangement(ContentArrangement::Dynamic);
+    table.set_header(vec![
+        Cell::new("Account ID"),
+        Cell::new("Account Name"),
+        Cell::new("This Month ($)").set_alignment(CellAlignment::Right),
+        Cell::new(incr_header).set_alignment(CellAlignment::Right),
+        Cell::new("Last Month ($)").set_alignment(CellAlignment::Right),
+    ]);
+
+    let mut total_this_month = 0.0_f64;
+    let mut total_increase = 0.0_f64;
+    let mut total_last_month = 0.0_f64;
+
+    for c in costs {
+        let incr = if compared_to == "LAST_WEEK" {
+            c.latest_weekly_cost_increase
+        } else {
+            c.latest_daily_cost_increase
+        };
+
+        let incr_str = format!("{} {:.6}", get_amount_prefix(incr), incr.abs());
+
+        table.add_row(vec![
+            Cell::new(&c.account_id),
+            Cell::new(&c.account_name),
+            Cell::new(format!("{:.6}", c.amount_this_month)).set_alignment(CellAlignment::Right),
+            Cell::new(&incr_str).set_alignment(CellAlignment::Right),
+            Cell::new(format!("{:.6}", c.amount_last_month)).set_alignment(CellAlignment::Right),
+        ]);
+
+        total_this_month += c.amount_this_month;
+        total_increase += incr;
+        total_last_month += c.amount_last_month;
+    }
+
+    // Footer row
+    let total_incr_str = format!(
+        "{} {:.6}",
+        get_amount_prefix(total_increase),
+        total_increase.abs()
+    );
+    table.add_row(vec![
+        Cell::new("").add_attribute(Attribute::Bold),
+        Cell::new("Total").add_attribute(Attribute::Bold),
+        Cell::new(format!("{:.6}", total_this_month))
+            .set_alignment(CellAlignment::Right)
+            .add_attribute(Attribute::Bold),
+        Cell::new(&total_incr_str)
+            .set_alignment(CellAlignment::Right)
+            .add_attribute(Attribute::Bold),
+        Cell::new(format!("{:.6}", total_last_month))
+            .set_alignment(CellAlignment::Right)
+            .add_attribute(Attribute::Bold),
+    ]);
+
+    println!("{table}");
+    println!("As of {}.", as_of.format("%Y-%m-%d"));
+
+    // Flush stdout
+    let _ = std::io::stdout().flush();
+}
+
+fn get_amount_prefix(amount: f64) -> &'static str {
+    if amount > 0.0 {
+        "+"
+    } else if amount < 0.0 {
+        "-"
+    } else {
+        ""
+    }
+}
diff --git a/src/organization.rs b/src/organization.rs
new file mode 100644
index 0000000..43f9ff7
--- /dev/null
+++ b/src/organization.rs
@@ -0,0 +1,102 @@
+use std::collections::HashMap;
+
+use anyhow::Result;
+use aws_sdk_organizations::Client as OrganizationsClient;
+
+/// Represents an AWS account with its ID and name.
+#[derive(Debug, Clone)]
+pub struct Account {
+    pub id: String,
+    pub name: String,
+}
+
+/// A map of account ID -> Account.
+pub type Accounts = HashMap<String, Account>;
+
+/// Extension trait for Accounts to get account IDs.
+pub trait AccountsExt {
+    fn account_ids(&self) -> Vec<String>;
+}
+
+impl AccountsExt for Accounts {
+    fn account_ids(&self) -> Vec<String> {
+        self.keys().cloned().collect()
+    }
+}
+
+/// List all accounts in the AWS Organization.
+pub async fn list_accounts(client: &OrganizationsClient) -> Result<Accounts> {
+    let mut accounts = HashMap::new();
+    let mut next_token: Option<String> = None;
+
+    loop {
+        let mut req = client.list_accounts();
+        if let Some(token) = &next_token {
+            req = req.next_token(token);
+        }
+
+        let output = req.send().await?;
+
+        for acc in output.accounts() {
+            let id = acc.id().unwrap_or_default().to_string();
+            let name = acc.name().unwrap_or_default().to_string();
+            accounts.insert(id.clone(), Account { id, name });
+        }
+
+        next_token = output.next_token().map(|s| s.to_string());
+        if next_token.is_none() {
+            break;
+        }
+    }
+
+    Ok(accounts)
+}
+
+/// List accounts under a specific OU (Organizational Unit).
+pub async fn list_accounts_by_ou(
+    client: &OrganizationsClient,
+    ou_id: &str,
+) -> Result<Accounts> {
+    let mut accounts = HashMap::new();
+    let mut next_token: Option<String> = None;
+
+    loop {
+        let mut req = client.list_accounts_for_parent().parent_id(ou_id);
+        if let Some(token) = &next_token {
+            req = req.next_token(token);
+        }
+
+        let output = req.send().await?;
+
+        for acc in output.accounts() {
+            let id = acc.id().unwrap_or_default().to_string();
+            let name = acc.name().unwrap_or_default().to_string();
+            accounts.insert(id.clone(), Account { id, name });
+        }
+
+        next_token = output.next_token().map(|s| s.to_string());
+        if next_token.is_none() {
+            break;
+        }
+    }
+
+    Ok(accounts)
+}
+
+/// Check if the error indicates that AWS Organizations is not enabled.
+pub fn is_organization_not_enabled(err: &anyhow::Error) -> bool {
+    let err_str = format!("{:?}", err);
+    err_str.contains("AWSOrganizationsNotInUseException")
+}
+
+/// Check if the error indicates insufficient permissions for Organizations API.
+pub fn has_no_permission_to_organizations_api(err: &anyhow::Error) -> bool {
+    let err_str = format!("{:?}", err);
+    err_str.contains("AccessDeniedException")
+}
+
+/// Check if the error indicates the OU does not exist.
+pub fn ou_not_found(err: &anyhow::Error) -> bool {
+    let err_str = format!("{:?}", err);
+    err_str.contains("ParentNotFoundException")
+}
diff --git a/src/sts.rs b/src/sts.rs
new file mode 100644
index 0000000..b131173
--- /dev/null
+++ b/src/sts.rs
@@ -0,0 +1,23 @@
+use anyhow::Result;
+use aws_sdk_iam::Client as IamClient;
+use aws_sdk_sts::Client as StsClient;
+
+/// Get the caller's account ID and name (alias).
+/// Returns (account_id, account_name).
+pub async fn get_caller_account(
+    sts_client: &StsClient,
+    iam_client: &IamClient,
+) -> Result<(String, String)> {
+    let identity = sts_client.get_caller_identity().send().await?;
+    let account_id = identity.account().unwrap_or_default().to_string();
+
+    // Try to fetch human-readable account name via IAM alias
+    let aliases_output = iam_client.list_account_aliases().send().await?;
+    let account_name = if let Some(first) = aliases_output.account_aliases().first() {
+        first.clone()
+    } else {
+        "Name not configured".to_string()
+    };
+
+    Ok((account_id, account_name))
+}
diff --git a/sts.go b/sts.go
deleted file mode 100644
index 2c2ed8f..0000000
--- a/sts.go
+++ /dev/null
@@ -1,40 +0,0 @@
-package acos
-
-import (
-	"context"
-
-	"github.com/aws/aws-sdk-go-v2/service/iam"
-	"github.com/aws/aws-sdk-go-v2/service/sts"
-)
-
-var (
-	// AWS clients
-	stsClient *sts.Client
-	iamClient *iam.Client
-)
-
-func init() {
-	stsClient = sts.NewFromConfig(cfg)
-	iamClient = iam.NewFromConfig(cfg)
-}
-
-// GetCallerAccount returns the account ID and name for the current user session.
-func GetCallerAccount(ctx context.Context) ([]string, error) {
-	res := make([]string, 2)
-	out, err := stsClient.GetCallerIdentity(ctx, &sts.GetCallerIdentityInput{})
-	if err != nil {
-		return res, err
-	}
-	res[0] = *out.Account // Account ID
-	// Try to fetch human-readable account name
-	out2, err := iamClient.ListAccountAliases(ctx, &iam.ListAccountAliasesInput{})
-	if err != nil {
-		return res, err
-	}
-	if len(out2.AccountAliases) > 0 {
-		res[1] = out2.AccountAliases[0] // Alias as account name
-	} else {
-		res[1] = "Name not configured"
-	}
-	return res, nil
-}