using Newtonsoft.Json;
using OSGeo.GDAL;
using OSGeo.OGR;
using SimuTools.Domain;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SimuTools.Tools
{
    public class Handle
    {
        public static readonly string BaseDir = AppDomain.CurrentDomain.BaseDirectory;

        /// <summary>
        /// 运行
        /// </summary>
        public static void Run(string terrainFile, string waterPath, string flowPath, string outPath)
        {
            Domain.Layer layer = new Domain.Layer();
            layer.duration = new Duration();
            layer.waters = new Water();

            CopeTerrain(terrainFile, outPath, layer);
            CopeWater(waterPath, outPath, layer);
            CopeFlow(flowPath, outPath, layer);
            CopeLayerJson(outPath, layer);
        }

        /// <summary>
        /// 处理地形
        /// </summary>
        private static void CopeTerrain(string terrainFile, string outPath, Domain.Layer layer)
        {
            Dataset ds = null;
            try
            {
                ds = Gdal.Open(terrainFile, Access.GA_ReadOnly);
                if (null == ds || 0 == ds.RasterCount || null == ds.GetSpatialRef()) return;

                SetTerrainInfo(ds, layer);
            }
            finally
            {
                if (null != ds) ds.Dispose();
            }
        }

        /// <summary>
        /// 设置地形信息
        /// </summary>
        private static void SetTerrainInfo(Dataset ds, Domain.Layer layer)
        {
            Geometry minPoint = GdalHelper.GetMinPoint(ds);
            Geometry maxPoint = GdalHelper.GetMaxPoint(ds);
            layer.extension = new Extension(minPoint.GetX(0), minPoint.GetY(0), maxPoint.GetX(0), maxPoint.GetY(0));

            Band band = ds.GetRasterBand(1);
            double[] mm = new double[2];
            band.ComputeRasterMinMax(mm, 0);
            layer.extension.SetHeight(mm[0], mm[1]);
        }

        /// <summary>
        /// 处理水面
        /// </summary>
        private static void CopeWater(string waterPath, string outPath, Domain.Layer layer)
        {

        }

        /// <summary>
        /// 处理流速流向
        /// </summary>
        private static void CopeFlow(string flowPath, string outPath, Domain.Layer layer)
        {

        }

        /// <summary>
        /// 处理元数据
        /// </summary>
        private static void CopeLayerJson(string outPath, Domain.Layer layer)
        {
            if (null == layer) return;

            String json = JsonConvert.SerializeObject(layer);

            string filePath = Path.Combine(outPath, "layer.json");
            using (StreamWriter sw = new StreamWriter(filePath))
            {
                sw.Write(json);
            }
        }
    }
}