using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Newtonsoft.Json;
using RecrownedAthenaeum.DataTypes;
using RecrownedAthenaeum.Pipeline.NinePatch;
using RecrownedAthenaeum.Pipeline.TextureAtlas;
using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RecrownedAthenaeum.Pipeline
{
    class TextureAtlasDataReader : ContentTypeReader<DataTypes.TextureAtlas>
    {
        protected override DataTypes.TextureAtlas Read(ContentReader input, DataTypes.TextureAtlas existingInstance)
        {
            int length = input.ReadInt32();
            byte[] compressedBytes = input.ReadBytes(length);
            byte[] decompressedBytes;
            using (MemoryStream inStream = new MemoryStream(compressedBytes))
            {
                using (GZipStream gZStream = new GZipStream(inStream, CompressionLevel.Optimal))
                {
                    using (MemoryStream outStream = new MemoryStream())
                    {
                        gZStream.CopyTo(outStream);
                        decompressedBytes = outStream.ToArray();
                    }
                }
            }
            TextureAtlasData atlasData = JsonConvert.DeserializeObject<TextureAtlasData>(Encoding.UTF8.GetString(decompressedBytes));

            DataTypes.TextureAtlas atlas;
            Texture2D atlasTexture = input.ContentManager.Load<Texture2D>(atlasData.textureName);
            DataTypes.TextureAtlas.TextureAtlasRegion[] regions = new DataTypes.TextureAtlas.TextureAtlasRegion[atlasData.regions.Length];

            for (int regionID = 0; regionID < regions.Length; regionID++)
            {
                TextureAtlasData.TextureAtlasRegion regionData = atlasData.regions[regionID];
                DataTypes.NinePatch nPatch = null;
                if (regionData.ninePatchData != null)
                {
                    NinePatchData nPatchData = regionData.ninePatchData;
                    nPatch = new DataTypes.NinePatch(atlasTexture, nPatchData.a, nPatchData.b, nPatchData.c, nPatchData.d);
                }

                regions[regionID] = new DataTypes.TextureAtlas.TextureAtlasRegion(regionData.name, regionData.location, nPatch, atlasTexture);
            }

            atlas = new DataTypes.TextureAtlas(atlasTexture, regions);

            return atlas;
        }
    }
}