package com.lf.server.helper;

import com.lf.server.entity.all.StaticData;
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) {
        Driver driver = null;
        DataSource dataSource = null;
        Layer layer = null;
        try {
            driver = ogr.GetDriverByName("ESRI shapefile");
            if (null == driver) {
                return null;
            }

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

            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();

            return new ShpRecordEntity(wkt, csid);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            return null;
        } finally {
            GdbHelper.delete(layer, dataSource, driver);
        }
    }

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

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

            layer = dataSource.GetLayer(0);
            if (layer.GetFeatureCount() == 0) {
                return null;
            }

            Map<Integer, Field> fields = getShpFields(layer);

            return setMarkJsonEntity(layer, fields);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            return null;
        } finally {
            GdbHelper.delete(layer, dataSource, driver);
        }
    }

    /**
     * 获取shp字段信息
     */
    private static Map<Integer, Field> getShpFields(Layer layer) {
        FeatureDefn featureDefn = layer.GetLayerDefn();

        Map<Integer, Field> fields = new HashMap(3);
        for (int i = 0, count = featureDefn.GetFieldCount(); i < count; i++) {
            try {
                FieldDefn fieldDefn = featureDefn.GetFieldDefn(i);
                Field field = MarkJsonEntity.class.getDeclaredField(fieldDefn.GetName());
                field.setAccessible(true);

                fields.put(i, field);
            } catch (Exception e) {
                //
            }
        }

        return fields;
    }

    /**
     * 设置标绘实体类
     */
    private static List<MarkJsonEntity> setMarkJsonEntity(Layer layer, Map<Integer, Field> fieldMap) throws Exception {
        List<MarkJsonEntity> list = new ArrayList<>();
        for (int i = 0; i < layer.GetFeatureCount(); i++) {
            Feature f = layer.GetFeature(i);

            MarkJsonEntity me = new MarkJsonEntity(i + 1);
            for (Integer key : fieldMap.keySet()) {
                Field field = fieldMap.get(key);
                GdbHelper.setValue(me, f, field, key);
            }
            me.setWkt(f.GetGeometryRef().ExportToWkt());

            list.add(me);
        }

        return list;
    }

    /**
     * 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) {
        Driver driver = null;
        DataSource dataSource = null;
        Layer layer = null;
        try {
            driver = ogr.GetDriverByName("ESRI shapefile");
            if (null == driver) {
                return null;
            }

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

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

            int geoType = getGeometryType(type);
            layer = dataSource.CreateLayer(type.toLowerCase(), sr, geoType);
            if (null == layer) {
                return null;
            }

            List<Field> fields = new ArrayList<>();
            GdbHelper.getFields(MarkJsonEntity.class, fields, StaticData.MARK_EXCLUDE_FIELDS);
            GdbHelper.addLayerField(layer, fields);

            FeatureDefn featureDefn = layer.GetLayerDefn();
            for (MarkJsonEntity t : list) {
                Feature f = new Feature(featureDefn);
                GdbHelper.setFeatureData(f, fields, t);

                Geometry geo = Geometry.CreateFromWkt(t.getWkt());
                f.SetGeometry(geo);

                layer.CreateFeature(f);
            }

            return filePath;
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            return null;
        } finally {
            GdbHelper.delete(layer, dataSource, driver);
        }
    }

    /**
     * 获取图形类型
     */
    private static int getGeometryType(String type) {
        switch (type) {
            case "POINT":
                return ogr.wkbPoint;
            case "LINESTRING":
                return ogr.wkbLineString;
            case "POLYGON":
                return ogr.wkbPolygon;
            default:
                return ogr.wkbUnknown;
        }
    }

    /**
     * 读取数据
     */
    public static <T> List<T> readData(Class clazz, String filePath) {
        List<T> list = new ArrayList<>();

        Driver driver = null;
        DataSource dataSource = null;
        try {
            driver = ogr.GetDriverByName("ESRI shapefile");
            if (null == driver) {
                return list;
            }

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

            Layer layer = dataSource.GetLayer(0);
            GdbHelper.readLayer(clazz, layer, list);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        } finally {
            GdbHelper.delete(dataSource, driver);
        }

        return list;
    }
}