"""A collection of functions which are triggered automatically by finder when
opencv-python package is included."""

import sys
from pathlib import Path

from ..common import TemporaryPath
from ..finder import ModuleFinder
from ..module import Module

DARWIN = sys.platform == "darwin"
WIN32 = sys.platform == "win32"

temp_path = TemporaryPath()


def load_cv2(finder: ModuleFinder, module: Module) -> None:
    """Versions of cv2 (opencv-python) above 4.5.3 require additional
    configuration files.

    Additionally, on Linux the opencv_python.libs directory is not
    copied across for versions above 4.5.3."""
    finder.include_package("numpy")
    if module.distribution is None:
        module.update_distribution("opencv-python")

    target_dir = Path("lib", "cv2")

    # conda-forge and msys2: cv2 4.6.0 is a extension module
    if module.path is None:
        # msys2 files is on share subdirectory
        source = Path(sys.base_prefix, "plugins/platforms")
        if not source.is_dir():
            source = Path(sys.base_prefix, "share/qt5/plugins/platforms")
        if source.is_dir():
            finder.include_files(source, target_dir / "plugins" / "platforms")
        source = Path(sys.base_prefix, "fonts")
        if not source.is_dir():
            source = Path(sys.base_prefix, "share/fonts")
        if source.is_dir():
            finder.include_files(source, target_dir / "fonts")
        qt_conf: Path = temp_path.path / "qt.conf"
        lines = ["[Paths]", f"Prefix = {target_dir.as_posix()}"]
        with qt_conf.open(mode="w", encoding="utf_8", newline="") as file:
            file.write("\n".join(lines))
        if DARWIN:
            target_qt_conf = "Contents/Resources/qt.conf"
        else:
            target_qt_conf = qt_conf.name
        finder.include_files(qt_conf, target_qt_conf)
        return

    # Use optmized mode
    module.in_file_system = 2
    finder.include_package("cv2")
    source_dir = module.path[0]
    for path in source_dir.glob("config*.py"):
        finder.include_files(path, target_dir / path.name)
    data_dir = source_dir / "data"
    if data_dir.exists():
        finder.include_files(data_dir, target_dir / "data")

    # Copy all binary files
    if WIN32:
        return
    if DARWIN:
        source_dylibs = source_dir / ".dylibs"
        if source_dylibs.exists():
            for file in source_dylibs.iterdir():
                finder.include_files(file, file.name)
        return

    # Linux and others
    libs_name = "opencv_python.libs"
    libs_dir = source_dir.parent / libs_name
    if libs_dir.exists():
        finder.include_files(libs_dir, target_dir.parent / libs_name)
    qt_files = source_dir / "qt"
    if qt_files.exists():
        finder.include_files(qt_files, target_dir / "qt")
