using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using CommandLine;
using CSharpx;

namespace agbidx
{
    [Verb("pokemon", HelpText = "Parse a combination of Pokémon front- and backsprite, and output two files respectively.")]
    class PokespriteOptions {
        [Option('i', "input-files", Required = true, HelpText = "Input images to be processed")]
        public IEnumerable<string> Input {get;set;}

        [Option('o', "output-directory", Default = ".", Required = false, HelpText = "Output directory for the processed images, defaults to current directory")]
        public string OutputDirectory{get;set;}

        [Option('v', "verbose", Default = false, Required = false, HelpText = "Show Verbose information")]
        public bool Verbose{get;set;}

        [Option('r', "recursive", Default = false, Required = false, HelpText = "Recursively scan directories for images, by default only one level is scanned, if an input argument is a directory")]
        public bool Recursive{get;set;}
    }
    class Program
    {
        static async Task<int> Main(string[] args)
        {
            return await CommandLine.Parser.Default.ParseArguments<PokespriteOptions>(args)
	            .MapResult(
	                async (PokespriteOptions opts) => await RunPokespritesAndReturnExitCode(opts),
	                async (IEnumerable<Error> errs) => await Task.Run<int>(() => 1));
        }

        static async Task<int> RunPokespritesAndReturnExitCode(PokespriteOptions opts)
        {
            try
            {
                if(!Directory.Exists(opts.OutputDirectory))
                    Directory.CreateDirectory(opts.OutputDirectory);
                    await Task.WhenAll(opts.Input.Select(s => ImageLib.BitmapProcessor.ProcessPokemonImage(opts.OutputDirectory, s, opts.Verbose, true, opts.Recursive)));
                return 0;
            }
            catch(Exception ex)
            {
                Console.WriteLine("An error occured: " + ex.Message);
                return 1;
            }

        }
    }
}