using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

using Amazon.CloudFormation.Model;
using Amazon.Common.DotNetCli.Tools;
using Amazon.Common.DotNetCli.Tools.Options;
using ThirdParty.Json.LitJson;

namespace Amazon.Lambda.Tools.Commands
{

    /// <summary>
    /// List all the CloudFormation Stacks deployed as AWS Serverless applications.
    /// AWS Serverless applications are identified by the tag AWSServerlessAppNETCore which 
    /// was automatically assigned to the stacks by the deploy-serverless command.
    /// </summary>
    public class ListServerlessCommand : LambdaBaseCommand
    {
        public const string COMMAND_NAME = "list-serverless";
        public const string COMMAND_DESCRIPTION = "Command to list all your AWS Serverless applications";


        public static readonly IList<CommandOption> ListCommandOptions = BuildLineOptions(new List<CommandOption>
        {
        });

      
        public ListServerlessCommand(IToolLogger logger, string workingDirectory, string[] args)
            : base(logger, workingDirectory, ListCommandOptions, args)
        {
        }

        /// <summary>
        /// Parse the CommandOptions into the Properties on the command.
        /// </summary>
        /// <param name="values"></param>
        protected override void ParseCommandArguments(CommandOptions values)
        {
            base.ParseCommandArguments(values);   
        }

        protected override async Task<bool> PerformActionAsync()
        {
            const int TIMESTAMP_WIDTH = 20;
            const int STACK_NAME_WIDTH = 30;
            const int STACK_STATUS_WIDTH = 20;

            this.Logger.WriteLine("Name".PadRight(STACK_NAME_WIDTH) + " " + 
                "Status".PadRight(STACK_STATUS_WIDTH) + " " +
                "Created".PadRight(TIMESTAMP_WIDTH) + " " +
                "Last Modifed".PadRight(TIMESTAMP_WIDTH)
                );
            this.Logger.WriteLine($"{new string('-', STACK_NAME_WIDTH)} {new string('-', STACK_STATUS_WIDTH)} {new string('-', TIMESTAMP_WIDTH)} {new string('-', TIMESTAMP_WIDTH)}");

            var request = new DescribeStacksRequest();
            DescribeStacksResponse response = null;
            do
            {
                if (response != null)
                    request.NextToken = response.NextToken;

                try
                {
                    response = await this.CloudFormationClient.DescribeStacksAsync(request);
                }
                catch (Exception e)
                {
                    throw new LambdaToolsException("Error listing AWS Serverless applications: " + e.Message, LambdaToolsException.LambdaErrorCode.CloudFormationDescribeStack, e);
                }

                foreach (var stack in response.Stacks)
                {
                    if (stack.Tags.Any(x => string.Equals(x.Key, LambdaConstants.SERVERLESS_TAG_NAME)))
                    {
                        this.Logger.WriteLine(
                            stack.StackName.PadRight(STACK_NAME_WIDTH) + " " + 
                            stack.StackStatus.ToString().PadRight(STACK_STATUS_WIDTH) + " " + 
                            stack.CreationTime.ToString("g").PadRight(STACK_STATUS_WIDTH) + " " +
                            stack.LastUpdatedTime.ToString("g").PadRight(TIMESTAMP_WIDTH)
                            );
                    }
                }

            } while (!string.IsNullOrEmpty(response.NextToken));

            return true;
        }
        
        protected override void SaveConfigFile(JsonData data)
        {
            
        }
    }
}