package com.lf.server.helper;

import com.lf.server.entity.ctrl.MarkJsonEntity;
import com.lf.server.entity.ctrl.ShpRecordEntity;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.gdal.ogr.*;
import org.gdal.osr.SpatialReference;

import java.io.File;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * ShapeFile帮助类
 * @author WWW
 */
public class ShpHelper {
    private final static Log log = LogFactory.getLog(ShpHelper.class);

    /**
     * 读取Shp第一条记录的WKT
     */
    public static ShpRecordEntity readShpFirstRecord(String filePath) {
        try {
            org.gdal.ogr.Driver driver = ogr.GetDriverByName("ESRI shapefile");
            if (driver == null) {
                return null;
            }

            DataSource dataSource = driver.Open(filePath);
            Layer layer = dataSource.GetLayer(0);
            if (layer.GetFeatureCount() < 1) {
                return null;
            }

            SpatialReference spatialReference = layer.GetSpatialRef();
            String csid = spatialReference.GetAttrValue("AUTHORITY", 1);

            Feature feature = layer.GetFeature(0);
            String wkt = feature.GetGeometryRef().ExportToWkt();

            layer.delete();
            dataSource.delete();
            driver.delete();

            return new ShpRecordEntity(wkt, csid);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            return null;
        }
    }

    /**
     * 读取ShapeFile文件获取Mark实体类
     */
    public static List<MarkJsonEntity> readShpForMarks(String filePath) {
        try {
            org.gdal.ogr.Driver driver = ogr.GetDriverByName("ESRI shapefile");
            if (driver == null) {
                return null;
            }

            DataSource dataSource = driver.Open(filePath);
            Layer layer = dataSource.GetLayer(0);

            FeatureDefn featureDefn = layer.GetLayerDefn();
            Map<Integer, Field> fieldMap = new HashMap(5);
            for (int i = 0, count = featureDefn.GetFieldCount(); i < count; i++) {
                try {
                    FieldDefn fieldDefn = featureDefn.GetFieldDefn(i);
                    Field field = MarkJsonEntity.class.getDeclaredField(fieldDefn.GetName().toLowerCase());
                    field.setAccessible(true);
                    fieldMap.put(i, field);
                } catch (Exception e) {
                    //
                }
            }

            long count = layer.GetFeatureCount();
            if (count == 0 || fieldMap.size() == 0) {
                return null;
            }

            List<MarkJsonEntity> list = new ArrayList<MarkJsonEntity>();
            for (int i = 0; i < count; i++) {
                Feature f = layer.GetFeature(i);
                MarkJsonEntity me = new MarkJsonEntity(i + 1);
                for (Integer key : fieldMap.keySet()) {
                    Field field = fieldMap.get(key);
                    switch (field.getType().toString()) {
                        case "double":
                            field.set(me, f.GetFieldAsDouble(i));
                            break;
                        case "long":
                            field.set(me, f.GetFieldAsInteger64(i));
                            break;
                        case "int":
                            field.set(me, f.GetFieldAsInteger(i));
                            break;
                        default:
                            field.set(me, f.GetFieldAsString(i));
                            break;
                    }
                }
                me.setWkt(f.GetGeometryRef().ExportToWkt());

                list.add(me);
            }

            layer.delete();
            driver.delete();

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

    /**
     * 创建ShapeFile文件
     *
     * @param list 标绘JSON实体类集合
     * @param path 路径
     * @param type 类型：POINT,LINESTRING,POLYGON
     * @return ShapeFile文件名
     */
    public static String createShp(List<MarkJsonEntity> list, String path, String type) {
        try {
            org.gdal.ogr.Driver driver = ogr.GetDriverByName("ESRI shapefile");
            if (driver == null) {
                return null;
            }

            String filePath = path + File.separator + type.toLowerCase() + ".shp";
            // DataSource ds = driver.Open(filePath, 0)
            DataSource ds = driver.CreateDataSource(filePath, null);

            SpatialReference sr = new SpatialReference();
            sr.ImportFromEPSG(4326);

            int geoType = getGeometryType(type);
            Layer layer = ds.CreateLayer(type.toLowerCase(), sr, geoType);

            FieldDefn fdName = new FieldDefn("name", ogr.OFTString);
            fdName.SetWidth(50);
            layer.CreateField(fdName, 0);

            FieldDefn fdProps = new FieldDefn("props", ogr.OFTString);
            fdProps.SetWidth(1024);
            // layer.DeleteField(layer.FindFieldIndex("name", 1))
            layer.CreateField(fdProps, 1);

            FeatureDefn featureDefn = layer.GetLayerDefn();
            for (MarkJsonEntity mje : list) {
                Geometry geo = Geometry.CreateFromWkt(mje.getWkt());

                Feature f = new Feature(featureDefn);
                f.SetField(0, mje.getName());
                f.SetField(1, mje.getProps());
                f.SetGeometry(geo);

                layer.CreateFeature(f);
            }

            layer.delete();
            ds.delete();
            driver.delete();

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

    /**
     * 获取图形类型
     */
    private static int getGeometryType(String type) {
        switch (type) {
            case "POINT":
                return 1;
            case "LINESTRING":
                return 2;
            case "POLYGON":
                return 3;
            default:
                return -1;
        }
    }

    /**
     * 读取数据
     */
    public static <T> List<T> readData(Class clazz, String filePath) {
        List<T> list = new ArrayList<>();
        try {
            org.gdal.ogr.Driver driver = ogr.GetDriverByName("ESRI shapefile");
            if (null == driver) {
                return list;
            }

            DataSource dataSource = driver.Open(filePath);
            if (null == dataSource) {
                return list;
            }

            Layer layer = dataSource.GetLayer(0);

            GdbHelper.readLayer(clazz, layer, list);

            dataSource.delete();
            driver.delete();
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        }

        return list;
    }
}