#!/usr/bin/env
# -*- coding: utf-8 -*-


import os
import sys
import time

sys.path.append(r"C:\Program Files\QGIS 3.16\apps\qgis-ltr\python\plugins")
import math
import argparse
from qgis.core import *
from qgis.gui import *
from qgis.PyQt.QtGui import *
from qgis.PyQt.QtCore import *
from qgis.PyQt.QtWidgets import *
from processing.core.Processing import Processing


# 获取完整路径
def get_full_path():
    return os.path.split(sys.argv[0])[0]


# 获取参数
def get_args():
    print("argv = ", sys.argv[1:])
    parser = argparse.ArgumentParser(description='ArgUtils')
    parser.add_argument("-src", type=str, default=get_full_path(), required=False)
    parser.add_argument("-qgz", type=str, default=r"xyz.qgz", required=False)
    parser.add_argument("-file", type=str, default=r"D:\xyz\dom0.2m\tif.txt", required=False)
    parser.add_argument("-out", type=str, default=r"D:\xyz\dom0.2m\png", required=False)
    parser.add_argument("-min", type=int, default=12, required=False)
    parser.add_argument("-max", type=int, default=15, required=False)
    parser.add_argument("-noData", type=int, default=0, required=False)

    return parser.parse_args()


# 读取文本文件
def read_txt(path):
    f = open(path, encoding="utf-8")
    lines = f.readlines()
    f.close()

    for i in range(0, len(lines)):
        lines[i] = lines[i].replace('\n', '')

    return lines


# 加载图层
def load_layers(prj, args):
    for layer in prj.mapLayers().values():
        prj.removeMapLayer(layer)

    args.crs = None
    lines = read_txt(args.file)
    for i in range(0, len(lines)):
        if len(lines[i]) == 0:
            continue

        print("layer_" + str(i) + ": " + lines[i])
        layer = QgsRasterLayer(lines[i], "layer_" + str(i))
        if not layer.isValid() or layer.crs() is None:
            print("layer_" + str(i) + ": failed to load!")
            continue

        if len(prj.mapLayers()) == 0:
            args.crs = layer.crs()
            print("authid: " + args.crs.authid())
            prj.setCrs(layer.crs())

        for j in range(1, layer.bandCount() + 1):
            try:
                layer.dataProvider().setNoDataValue(j, args.noData)
            except Exception as e:
                print(e)

        prj.addMapLayer(layer)


# 边界类
class Rectangle:
    def __init__(self, xmin, xmax, ymin, ymax):
        self.xmin = xmin
        self.xmax = xmax
        self.ymin = ymin
        self.ymax = ymax


# 获取边界
def get_extent(prj, args):
    ex = None
    for layer in prj.mapLayers().values():
        rect = layer.extent()
        if ex is None:
            # print(layer.extent().asWktCoordinates()); geo = QgsGeometry.fromWkt(layer.extent().asWktPolygon())
            ex = Rectangle(rect.xMinimum(), rect.xMaximum(), rect.yMinimum(), rect.yMaximum())
            continue

        if args.crs.authid() != layer.crs().authid():
            transform = QgsCoordinateTransform(layer.crs(), args.crs, prj)
            min = QgsPoint(rect.xMinimum(), rect.yMinimum())
            max = QgsPoint(rect.xMaximum(), rect.yMaximum())
            min.transform(transform)
            max.transform(transform)

            set_rect_bound(ex, min.x(), min.y(), max.x(), max.y())

        else:
            set_rect_bound(ex, rect.xMinimum(), rect.yMinimum(), rect.xMaximum(), rect.yMaximum())

    # 123543.6722,2730986.0671,2732253.9315,3552923.0518 [EPSG:32643]
    # return '38400309.1314,38403253.7083,3559920.4768,3561690.3144 [CGCS2000 / 3-degree Gauss-Kruger zone 38]'
    return str(ex.xmin) + "," + str(ex.xmax) + "," + str(ex.ymin) + "," + str(ex.ymax) + ' [' + args.crs.authid() + "]"


# 设置矩形边界
def set_rect_bound(ex, xmin, ymin, xmax, ymax):
    if xmin < ex.xmin:
        ex.xmin = xmin
    if ymin < ex.ymin:
        ex.ymin = ymin
    if xmax > ex.xmax:
        ex.xmax = xmax
    if ymax > ex.ymax:
        ex.ymax = ymax


# 获取XYZ参数
def get_xyz_ops(args):
    ops = {
        'BACKGROUND_COLOR': QColor(0, 0, 0, 0),
        'DPI': 96,
        'EXTENT': args.ext,
        'METATILESIZE': 4,
        'OUTPUT_DIRECTORY': args.out,
        # 'OUTPUT_HTML': 'TEMPORARY_OUTPUT',
        'OUTPUT_HTML': args.out + "\\view.html",
        'QUALITY': 100,
        'TILE_FORMAT': 0,
        'TILE_HEIGHT': 256,
        'TILE_WIDTH': 256,
        'TMS_CONVENTION': False,
        'ZOOM_MAX': args.max,
        'ZOOM_MIN': args.min
    }
    print(ops)

    return ops


# 创建XYZ瓦片
def create_xyz(args):
    import processing

    ops = get_xyz_ops(args)
    processing.run("qgis:tilesxyzdirectory", ops)


# 初始化
def init():
    # QgsApplication.setPrefixPath("C:\Program Files\QGIS 3.16", True)
    qgs = QgsApplication([], False)
    qgs.initQgis()
    Processing.initialize()

    args = get_args()
    prj = QgsProject.instance()
    prj.read(os.path.join(args.src, args.qgz))
    # prj.read(args.qgz)
    print("FileName: " + prj.fileName())

    load_layers(prj, args)
    # prj.write(args.file.replace(".txt", ".qgz"))

    args.ext = get_extent(prj, args)
    create_xyz(args)

    qgs.exitQgis()


# main
if __name__ == '__main__':
    timer = time.time()
    init()
    print(f'耗时:{time.time() - timer:.2f}s')