from argparse import ArgumentParser
from pathlib import Path
import time
import urllib.error
import urllib.request


def download_tile(zoom: int, x: int, y: int, tile_path: Path):
    osm_timeout = 3
    http_code_ok = 200

    request = urllib.request.Request(f'https://tile.openstreetmap.org/{zoom}/{x}/{y}.png')
    request.add_header('User-Agent', 'Mozilla/5.0 (X11; Linux x86_64; rv:138.0) Gecko/20100101 Firefox/138.0')
    request.add_header('Accept', 'image/avif,image/webp,image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5')
    request.add_header('Accept-Language', 'en-US,en;q=0.5')
    request.add_header('Accept-Encoding', 'gzip, deflate, br, zstd')
    try:
        with urllib.request.urlopen(request, timeout=osm_timeout) as response:
            if response.status != http_code_ok:
                raise RuntimeError(
                    f'tile.openstreetmap.org answer is not OK (status: {response.status}) : {response.read()}')
            tile_path.write_bytes(response.read())
    except urllib.error.URLError as error:
        raise RuntimeError(f'Cannot retrieve tile: {error}') from error


def main():
    parser = ArgumentParser()
    parser.add_argument('data', type=Path, help='Path to tile data to consolidate')
    arguments = parser.parse_args()

    data_path: Path = arguments.data
    del arguments

    zoom_levels = sorted([int(p.name) for p in data_path.iterdir()])
    download_time = 0.2
    try:
        for zoom in zoom_levels:
            x_min = 10_000_000
            x_max = -10_000_000
            y_min = 10_000_000
            y_max = -10_000_000
            tile_count = 0
            for tile_path in (data_path / str(zoom)).rglob('*.png'):
                x_value = int(tile_path.parent.name)
                x_min = min(x_min, x_value)
                x_max = max(x_max, x_value)
                y_value = int(tile_path.stem)
                y_min = min(y_min, y_value)
                y_max = max(y_max, y_value)
                tile_count += 1
            total_tile_count = (x_max - x_min + 1) * (y_max - y_min + 1)
            print(f'{zoom=} x in [{x_min}, {x_max}], y in [{y_min}, {y_max}]:'
                f' {tile_count} files out of {total_tile_count} -> {total_tile_count - tile_count} to download')
            start_download = time.monotonic()
            for x in range(x_min, x_max + 1):
                for y in range(y_min, y_max + 1):
                    tile_path = Path(data_path / str(zoom) / str(x) / f'{y}.png')
                    if tile_path.exists():
                        continue
                    try:
                        if not tile_path.parent.exists():
                            tile_path.parent.mkdir(parents=True, exist_ok=True)
                        download_tile(zoom=zoom, x=x, y=y, tile_path=tile_path)
                        time.sleep(0.1)
                    except RuntimeError as error:
                        print(error)
                        continue
                    tile_count += 1
                    if tile_count % 5 == 0 or tile_count == total_tile_count:
                        download_time = 0.99 * download_time + (0.01 * (time.monotonic() - start_download) / 5)
                        remaining_time = int((total_tile_count - tile_count) * download_time)
                        remaining_hours = remaining_time // 3600
                        remaining_time -= 3600 * remaining_hours
                        remaining_minutes = remaining_time // 60
                        remaining_time -= 60 * remaining_minutes
                        print(f'Downloading tiles {tile_count} / {total_tile_count}'
                              f' ({remaining_hours:02d}:{remaining_minutes:02d}:{remaining_time:02d} remaining)',
                              end='\r')
                        start_download = time.monotonic()
        print()
    except KeyboardInterrupt:
        print('\rDo')


if __name__ == '__main__':
    main()