using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using LibNoise.Xna;
using LibNoise.Xna.Generator;
using LibNoise.Xna.Operator;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System.IO;
using System.Threading;

namespace Cubetex
{

    class WorldGenSettings
    {
        /// <summary>
        /// The ammount of terrain change per pixel
        /// </summary>
        public float VerticalGradient = .3f;
        public float OceanLimit = .1f;

        public int Seed = 0;

        public volatile bool Generated = false;

        public string Path;

    }



    class WorldGenerator : IWorldGenerator
    {
        const int size = 1024;
        Noise2D noiseGenerator;


        public void ThreadedGenerate(object Context)
        {
            GenerateWorld((WorldGenSettings)Context);
        }


        public void GenerateWorld(WorldGenSettings settings)
        {


            ModuleBase Ocean = new Const(-1);


            ModuleBase flat_raw = new Const(.1);
            ModuleBase Flat = new Clamp(0, .1, flat_raw);



            //ModuleBase OceanSelector = new Voronoi(16, 2, 0, false);
            ModuleBase TerrainGenerator = new Perlin(1.5, 2.5, .5, 6, settings.Seed, QualityMode.Medium);
            ModuleBase abs = new Invert(TerrainGenerator);
            ModuleBase terrain_raw = new ScaleBias(settings.VerticalGradient, .1, abs);

            ModuleBase terrain_1 = new Clamp(.1, .8, terrain_raw);
            ModuleBase TerrainFinal = terrain_1;






            ModuleBase OceanSelector = new Perlin(1.5, 2.5, .5, 6, settings.Seed, QualityMode.Medium); // 1.png
            ModuleBase Ocean_1 = new Clamp(-1, .9, OceanSelector);
            ModuleBase OceanFinal = Ocean_1;



            ModuleBase terrain = new Select(.1, 1, 0, TerrainFinal, Ocean, OceanFinal);


            //
            //ModuleBase voronoi = new Voronoi(16, 2, 0, false);


            noiseGenerator = new Noise2D(size, terrain);

            noiseGenerator.GeneratePlanar(Noise2D.Left, Noise2D.Right, Noise2D.Top, Noise2D.Bottom);


            Texture2D tex = noiseGenerator.GetTexture(ArtManager.GraphicsDevice, Gradient.Terrain) ;

            string Path = FileSystem.GetWorldPath(settings.Path) ;
            string filename = "Terrain.png";

            using (Stream stream = File.Open(Path + filename, FileMode.OpenOrCreate))
            {

                tex.SaveAsPng(stream, size, size);
                GameConsole.ConsoleMessage("Screenshot saved as: " + filename);
            }
            lock (settings)
            {
                settings.Generated = true;
            }
        }
    }
}