#include "googleTile.h"
#include <opencv2/imgcodecs.hpp>
#include <opencv2/imgproc.hpp>
#include <iostream>
#include <fstream>
#include <cmath>
#include <filesystem>

using std::string;

#define M_PI 3.1415926

googleTile::googleTile()
{

}

googleTile::~googleTile()
{
}

void googleTile::ExportGeoPng(cv::Mat _pan, TileInfo info, std::string dir, std::string name)
{
    // 保存全景图
    string png_path = dir + "/" + name + ".png";
    cv::imwrite(png_path, _pan);


    // 写入kml
    string kml_path = dir + "/" + name + ".kml";
    std::ofstream kml_file(kml_path);

    // 写入 KML 文件的头部
    kml_file << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" << std::endl;
    kml_file << "<kml xmlns=\"http://www.opengis.net/kml/2.2\">" << std::endl;
    kml_file << "<Document>" << std::endl;

    // 写入 GroundOverlay 元素
    kml_file << "<GroundOverlay>" << std::endl;
    kml_file << "  <name>My Panoramic Image</name>" << std::endl;
    kml_file << "  <Icon>" << std::endl;
    kml_file << "    <href>" << name + ".png" << "</href>" << std::endl;
    kml_file << "  </Icon>" << std::endl;

    // 使用四个角点计算 LatLonBox
    kml_file << "  <LatLonBox>" << std::endl;
    kml_file << "    <north>" << info.north << "</north>" << std::endl;  // 经度范围
    kml_file << "    <south>" << info.south << "</south>" << std::endl;
    kml_file << "    <east>" << info.east << "</east>" << std::endl;  // 纬度范围
    kml_file << "    <west>" << info.west << "</west>" << std::endl;
    kml_file << "  </LatLonBox>" << std::endl;

    // 写入 KML 文件的尾部
    kml_file << "</GroundOverlay>" << std::endl;
    kml_file << "</Document>" << std::endl;
    kml_file << "</kml>" << std::endl;

    kml_file.close();
}

void googleTile::ExportTile(cv::Mat _pan, TileInfo info, std::string dir, std::string name)
{
    // 计算四至的瓦片编号
    TileIndex westNorth = LatLonToTile(info.west, info.north, 10);
    int a = 0;
}

TileIndex googleTile::LatLonToTile(double latitude, double longitude, int zoomLevel)
{
    // 将纬度转换为墨卡托投影
    double latRad = latitude * M_PI / 180.0;
    double sinLat = sin(latRad);

    // 计算经度的瓦片编号（0-2^zoomLevel）
    int xTile = static_cast<int>((longitude + 180.0) / 360.0 * pow(2.0, zoomLevel));

    // 计算纬度的瓦片编号（0-2^zoomLevel）
    int yTile = static_cast<int>((1.0 - log((1.0 + sinLat) / (1.0 - sinLat)) / (2.0 * M_PI)) / 2.0 * pow(2.0, zoomLevel));

    return TileIndex{ xTile, yTile, zoomLevel };
}