package com.se.simu.service;

import cn.hutool.json.JSONUtil;
import com.se.simu.config.PropertiesConfig;
import com.se.simu.domain.po.DataPo;
import com.se.simu.domain.po.SimuPo;
import com.se.simu.domain.vo.*;
import com.se.simu.helper.GdalHelper;
import lombok.extern.slf4j.Slf4j;
import org.gdal.gdal.Dataset;
import org.gdal.gdal.gdal;
import org.gdal.gdalconst.gdalconst;
import org.gdal.osr.SpatialReference;
import org.gdal.osr.osr;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.io.File;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * 内涝服务类
 *
 * @author WWW
 * @date   2024-07-16
 */
@Slf4j
@Service
@SuppressWarnings("ALL")
public class WaterService {
    @Resource
    PropertiesConfig config;

    /**
     * 获取元数据信息
     */
    public byte[] getson(String serviceName, String json) {
        try {
            String filePath = config.getOutPath() + File.separator + serviceName + File.separator + json;

            File dat = new File(filePath);
            if (!dat.exists()) {
                return null;
            }

            byte[] bytes = new byte[(int) dat.length()];

            FileInputStream fs = new FileInputStream(filePath);
            fs.read(bytes);
            fs.close();

            return bytes;
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            return null;
        }
    }

    /**
     * 获取地形高度图
     */
    public String getTerraMap(String serviceName, Integer width, Integer height) {
        return config.getOutPath() + File.separator + serviceName + File.separator + "terrain" + File.separator + width + "_" + height + ".png";
    }

    /**
     * 获取水面高度图
     */
    public String getWaterMap(String serviceName, Integer width, Integer height, Long timestamp) {
        return config.getOutPath() + File.separator + serviceName + File.separator + "waters" + File.separator + timestamp + File.separator + width + "_" + height + ".png";
    }

    /**
     * 获取水流向流速图
     */
    public String getFlowMap(String serviceName, Integer width, Integer height, Long timestamp) {
        return config.getOutPath() + File.separator + serviceName + File.separator + "flows" + File.separator + timestamp + File.separator + width + "_" + height + ".png";
    }

    /**
     * 获取图层 *
     */
    public Layer getLayer(String serviceName) {
        Layer layer = new Layer();
        layer.setVersion(config.getVer());
        layer.setDuration(new Duration(1719812810225L, 1719812810225L));
        layer.setExtension(new Extension(2.11062743358, 0.53812160220, 2.11070827834, 0.53819799453, 1.151, 38.83));

        List<Integer[]> sizes = new ArrayList<>();
        sizes.add(new Integer[]{64, 64});
        sizes.add(new Integer[]{128, 128});
        sizes.add(new Integer[]{256, 256});
        sizes.add(new Integer[]{512, 512});
        sizes.add(new Integer[]{1024, 1024});
        sizes.add(new Integer[]{2048, 2048});
        layer.setTerrain(new Terrain(sizes));

        List<Long> data = new ArrayList<>(Arrays.asList(1719812812225L, 1719812812225L, 1719812812225L, 1719812812225L, 1719812812225L, 1719812812225L));
        layer.setWaters(new Water(data));

        return layer;
    }

    /**
     * 根据坐标查询积水深度:gdalconst.GA_Update
     */
    public Double getWaterHeight(SimuPo simu, double x, double y, Long timestamp) {
        String filePath = config.getOutPath() + File.separator + simu.getServiceName() + File.separator + "waters"
                + File.separator + timestamp + File.separator + "water.tif";

        Dataset ds = null;
        try {
            ds = gdal.Open(filePath, gdalconst.GA_ReadOnly);
            if (null == ds || ds.getRasterCount() < 1) {
                return null;
            }
            if (null == ds.GetSpatialRef()) {
                ds.SetSpatialRef(getSpatialRef(simu));
            }

            double[] gt = ds.GetGeoTransform();
            double[] xy = GdalHelper.fromWgs84(ds.GetSpatialRef(), x, y);
            int[] XY = coordinates2ColRow(gt, xy[0], xy[1]);

            if (XY[0] < 0 || XY[1] < 0 || XY[0] > ds.getRasterXSize() || XY[1] > ds.getRasterYSize()) {
                return null;
            }

            double[] vals = new double[1];
            ds.GetRasterBand(1).ReadRaster(XY[0], XY[1], 1, 1, vals);

            return isValid(vals[0]) ? vals[0] : null;
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            return null;
        } finally {
            if (null != ds) ds.delete();
        }
    }

    private SpatialReference getSpatialRef(SimuPo simu) {
        DataPo data = JSONUtil.toBean(simu.getData(), DataPo.class);

        SpatialReference sr = new SpatialReference();
        sr.ImportFromEPSG(data.getEpsg());
        sr.SetAxisMappingStrategy(osr.OAMS_TRADITIONAL_GIS_ORDER);

        return sr;
    }

    /**
     * 将地图坐标转换为栅格像素坐标
     *
     * @param gt 仿射变换参数
     * @param x  横坐标
     * @param y  纵坐标
     * @return 像素坐标
     */
    public int[] coordinates2ColRow(double[] gt, double x, double y) {
        // 向下取整,如果向上取整会导致计算结果偏大，从而在后面读取到邻近像元的数据
        //Double col = Math.floor(((y - gt[3]) * gt[1] - (x - gt[0]) * gt[4]) / (gt[5] * gt[1] - gt[2] * gt[4]));
        Double col = Math.floor((y * gt[1] - x * gt[4] + gt[0] * gt[4] - gt[3] * gt[1]) / (gt[5] * gt[1] - gt[2] * gt[4]));
        Double row = Math.floor((x - gt[0] - col * gt[2]) / gt[1]);

        return new int[]{row.intValue(), col.intValue()};
    }

    public static boolean isValid(double val) {
        return !Double.isNaN(val) && val > Integer.MIN_VALUE;
    }
}