package com.se.simu.helper;

import com.se.simu.domain.LayerVo;
import lombok.extern.slf4j.Slf4j;
import org.gdal.gdal.Band;
import org.gdal.gdal.Dataset;
import org.gdal.gdal.gdal;
import org.gdal.gdalconst.gdalconst;
import org.gdal.ogr.Geometry;
import org.gdal.ogr.ogr;
import org.gdal.osr.SpatialReference;

import java.io.File;

/**
 * GDAL帮助类
 *
 * @author WWW
 * @date 2024-07-16
 */
@Slf4j
@SuppressWarnings("ALL")
public class GdalHelper {
    public final static int I4326 = 4326;

    public final static int I4490 = 4490;

    public static SpatialReference SR4326;

    public static SpatialReference SR4490;

    public final static String CGCS2000 = "CGCS2000";

    /**
     * 初始化
     */
    public static void init(String gdalPath) {
        // 支持中文路径
        gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "YES");
        // 属性表支持中文：CP936
        gdal.SetConfigOption("SHAPE_ENCODING", "");
        gdal.SetConfigOption("PGEO_DRIVER_TEMPLATE", "DRIVER=Microsoft Access Driver (*.mdb, *.accdb);DBQ=%s");
        gdal.SetConfigOption("MDB_DRIVER_TEMPLATE", "DRIVER=Microsoft Access Driver (*.mdb, *.accdb);DBQ=%s");

        // 配置环境变量
        if (!StringHelper.isEmpty(gdalPath)) {
            gdal.SetConfigOption("GDAL_DATA", gdalPath + "/gdal-data");
            gdal.SetConfigOption("PROJ_LIB", gdalPath + "/proj7/share");
            //System.setProperty("PROJ_LIB", gdalPath + "/proj7/share")
            gdal.SetConfigOption("GDAL_DRIVER_PATH", gdalPath + "/gdalplugins");

            String path = System.getenv("PATH");
            if (!path.contains(gdalPath)) {
                System.setProperty("PATH", path + ";" + gdalPath);
            }
        }

        // 注册所有的驱动
        gdal.AllRegister();
        ogr.RegisterAll();
        initSr();
    }

    /**
     * 初始化坐标系
     */
    public static void initSr() {
        try {
            SR4326 = new SpatialReference();
            SR4326.ImportFromEPSG(I4326);

            SR4490 = new SpatialReference();
            SR4490.ImportFromEPSG(I4490);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        }
    }

    /**
     * 读取DEM边界
     */
    public static LayerVo readDemExtent(String file) {
        LayerVo layer = new LayerVo();
        Dataset ds = null;

        try {
            File f = new File(file);
            if (!f.exists() || f.isDirectory()) {
                return null;
            }

            ds = gdal.Open(file, gdalconst.GA_ReadOnly);
            if (null == ds) {
                return null;
            }

            Band band = ds.GetRasterBand(1);
            double[] mm = new double[2];
            band.ComputeRasterMinMax(mm);

            Geometry minPoint = getMinPoint(ds);
            Geometry maxPoint = getMaxPoint(ds);

            layer.setExtension(new LayerVo.Extension(minPoint.GetX(), minPoint.GetY(), maxPoint.GetX(), maxPoint.GetY(), mm[0], mm[1]));
            layer.setTerrain(new LayerVo.Terrain(band.getXSize(), band.getYSize()));
            layer.setWater(new LayerVo.Water(band.getXSize(), band.getYSize(), null));
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        } finally {
            if (null != ds) {
                ds.delete();
            }
        }

        return layer;
    }

    /**
     * 获取Dataset的最小点
     */
    private static Geometry getMinPoint(Dataset ds) {
        double[] transform = new double[6];
        ds.GetGeoTransform(transform);

        double xMin = transform[0];
        double yMin = transform[3] - ds.getRasterYSize() * transform[1];

        Geometry point = new Geometry(ogr.wkbPoint);
        point.AddPoint(xMin, yMin, 0);

        return transform(ds, point);
    }

    /**
     * 获取Dataset的最大点
     */
    private static Geometry getMaxPoint(Dataset ds) {
        /*
         * transform[0] 左上角x坐标
         * transform[1] 东西方向分辨率
         * transform[2] 旋转角度, 0表示图像 "北方朝上"
         *
         * transform[3] 左上角y坐标
         * transform[4] 旋转角度, 0表示图像 "北方朝上"
         * transform[5] 南北方向分辨率
         */
        double[] transform = new double[6];
        ds.GetGeoTransform(transform);

        double xMax = transform[0] + (ds.getRasterXSize() * transform[1]);
        double yMax = transform[3];

        Geometry point = new Geometry(ogr.wkbPoint);
        point.AddPoint(xMax, yMax, 0);

        return transform(ds, point);
    }

    /**
     * 坐标转换
     */
    private static Geometry transform(Dataset ds, Geometry point) {
        point.AssignSpatialReference(ds.GetSpatialRef());
        if (ds.GetSpatialRef().IsGeographic() > 0) {
            return point;
        }

        String srsName = ds.GetSpatialRef().GetName();
        if (srsName.contains(CGCS2000)) {
            point.TransformTo(SR4490);
        } else {
            point.TransformTo(SR4326);
        }
        point.SwapXY();

        return point;
    }

    /**
     * 创建金字塔
     */
    public static void createPyramid(String file) {
        Dataset ds = null;
        try {
            File f = new File(file);
            if (!f.exists() || f.isDirectory()) {
                return;
            }

            ds = gdal.Open(file, gdalconst.GA_ReadOnly);
            if (null == ds) {
                return;
            }

            // 创建金字塔
            Band band = ds.GetRasterBand(1);
            if (0 == band.GetOverviewCount()) {
                ds.BuildOverviews("nearest", new int[]{2, 4, 6, 8, 16}, null);
            }
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        } finally {
            if (null != ds) {
                ds.delete();
            }
        }
    }
}