from __future__ import annotations

from pathlib import Path
from typing import Any, Optional

import yaml
from appdirs import AppDirs


class Config:
    class _Directories:
        # default directories, do not modify here, set via config
        app_dirs = AppDirs("unshackle", False)
        core_dir = Path(__file__).resolve().parent
        namespace_dir = core_dir.parent
        commands = namespace_dir / "commands"
        services = [namespace_dir / "services"]
        vaults = namespace_dir / "vaults"
        fonts = namespace_dir / "fonts"
        user_configs = core_dir.parent
        data = core_dir.parent
        downloads = core_dir.parent.parent / "downloads"
        temp = core_dir.parent.parent / "temp"
        cache = data / "cache"
        cookies = data / "cookies"
        logs = data / "logs"
        wvds = data / "WVDs"
        prds = data / "PRDs"
        dcsl = data / "DCSL"

    class _Filenames:
        # default filenames, do not modify here, set via config
        log = "unshackle_{name}_{time}.log"  # Directories.logs
        config = "config.yaml"  # Directories.services / tag
        root_config = "unshackle.yaml"  # Directories.user_configs
        chapters = "Chapters_{title}_{random}.txt"  # Directories.temp
        subtitle = "Subtitle_{id}_{language}.srt"  # Directories.temp

    def __init__(self, **kwargs: Any):
        self.dl: dict = kwargs.get("dl") or {}
        self.aria2c: dict = kwargs.get("aria2c") or {}
        self.n_m3u8dl_re: dict = kwargs.get("n_m3u8dl_re") or {}
        self.cdm: dict = kwargs.get("cdm") or {}
        self.chapter_fallback_name: str = kwargs.get("chapter_fallback_name") or ""
        self.curl_impersonate: dict = kwargs.get("curl_impersonate") or {}
        self.remote_cdm: list[dict] = kwargs.get("remote_cdm") or []
        self.credentials: dict = kwargs.get("credentials") or {}
        self.subtitle: dict = kwargs.get("subtitle") or {}

        self.directories = self._Directories()
        for name, path in (kwargs.get("directories") or {}).items():
            if name.lower() in ("app_dirs", "core_dir", "namespace_dir", "user_configs", "data"):
                # these must not be modified by the user
                continue
            if name == "services" and isinstance(path, list):
                setattr(self.directories, name, [Path(p).expanduser() for p in path])
            else:
                setattr(self.directories, name, Path(path).expanduser())

        downloader_cfg = kwargs.get("downloader") or "requests"
        if isinstance(downloader_cfg, dict):
            self.downloader_map = {k.upper(): v for k, v in downloader_cfg.items()}
            self.downloader = self.downloader_map.get("DEFAULT", "requests")
        else:
            self.downloader_map = {}
            self.downloader = downloader_cfg

        self.filenames = self._Filenames()
        for name, filename in (kwargs.get("filenames") or {}).items():
            setattr(self.filenames, name, filename)

        self.headers: dict = kwargs.get("headers") or {}
        self.key_vaults: list[dict[str, Any]] = kwargs.get("key_vaults", [])
        self.muxing: dict = kwargs.get("muxing") or {}
        self.proxy_providers: dict = kwargs.get("proxy_providers") or {}
        self.serve: dict = kwargs.get("serve") or {}
        self.services: dict = kwargs.get("services") or {}
        decryption_cfg = kwargs.get("decryption") or {}
        if isinstance(decryption_cfg, dict):
            self.decryption_map = {k.upper(): v for k, v in decryption_cfg.items()}
            self.decryption = self.decryption_map.get("DEFAULT", "shaka")
        else:
            self.decryption_map = {}
            self.decryption = decryption_cfg or "shaka"

        self.set_terminal_bg: bool = kwargs.get("set_terminal_bg", False)
        self.tag: str = kwargs.get("tag") or ""
        self.tmdb_api_key: str = kwargs.get("tmdb_api_key") or ""
        self.update_checks: bool = kwargs.get("update_checks", True)
        self.update_check_interval: int = kwargs.get("update_check_interval", 24)
        self.scene_naming: bool = kwargs.get("scene_naming", True)

    @classmethod
    def from_yaml(cls, path: Path) -> Config:
        if not path.exists():
            raise FileNotFoundError(f"Config file path ({path}) was not found")
        if not path.is_file():
            raise FileNotFoundError(f"Config file path ({path}) is not to a file.")
        return cls(**yaml.safe_load(path.read_text(encoding="utf8")) or {})


# noinspection PyProtectedMember
POSSIBLE_CONFIG_PATHS = (
    # The unshackle Namespace Folder (e.g., %appdata%/Python/Python311/site-packages/unshackle)
    Config._Directories.namespace_dir / Config._Filenames.root_config,
    # The Parent Folder to the unshackle Namespace Folder (e.g., %appdata%/Python/Python311/site-packages)
    Config._Directories.namespace_dir.parent / Config._Filenames.root_config,
    # The AppDirs User Config Folder (e.g., %localappdata%/unshackle)
    Config._Directories.user_configs / Config._Filenames.root_config,
)


def get_config_path() -> Optional[Path]:
    """
    Get Path to Config from any one of the possible locations.

    Returns None if no config file could be found.
    """
    for path in POSSIBLE_CONFIG_PATHS:
        if path.exists():
            return path
    return None


config_path = get_config_path()
if config_path:
    config = Config.from_yaml(config_path)
else:
    config = Config()

__all__ = ("config",)