// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
// snippet-start:[dynamodb.go.list_all_tables]
package main

// snippet-start:[dynamodb.go.list_all_tables.imports]
import (
	"flag"
	"fmt"

	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/dynamodb"
)

// snippet-end:[dynamodb.go.list_all_tables.imports]

// GetTables retrieves a list of your Amazon DynamoDB tables
// Inputs:
//
//	sess is the current session, which provides configuration for the SDK's service clients
//	limit is the maximum number of tables to return
//
// Output:
//
//	If success, a list of the tables and nil
//	Otherwise, nil and an error from the call to ListTables
func GetTables(sess *session.Session, limit *int64) ([]*string, error) {
	// snippet-start:[dynamodb.go.list_all_tables.call]
	svc := dynamodb.New(sess)

	result, err := svc.ListTables(&dynamodb.ListTablesInput{
		Limit: limit,
	})
	// snippet-end:[dynamodb.go.list_all_tables.call]
	if err != nil {
		return nil, err
	}

	return result.TableNames, nil
}

func main() {
	// snippet-start:[dynamodb.go.list_all_tables.args]
	limit := flag.Int64("l", 100, "How many tables to return")
	flag.Parse()

	if *limit < int64(0) {
		*limit = int64(10)
	}
	// snippet-end:[dynamodb.go.list_all_tables.args]

	// snippet-start:[dynamodb.go.list_all_tables.session]
	sess := session.Must(session.NewSessionWithOptions(session.Options{
		SharedConfigState: session.SharedConfigEnable,
	}))
	// snippet-end:[dynamodb.go.list_all_tables.session]

	tables, err := GetTables(sess, limit)
	if err != nil {
		fmt.Println("Got an error retrieving table names:")
		fmt.Println(err)
		return
	}

	// Get up to limit tables
	for _, n := range tables {
		fmt.Println(*n)
	}
}

// snippet-end:[dynamodb.go.list_all_tables]
