from __future__ import annotations

from pathlib import Path

from ..config import BASE_DIR, USE_OFFLINE_LIBS

# Notatka: jeden manifest utrzymuje spójne adresy CDN i ścieżki lokalne dla trybu offline.
LIBS_STATIC_DIR = "libs"
LIBS_DIR = BASE_DIR / "pytorrent" / "static" / LIBS_STATIC_DIR
BOOTSTRAP_VERSION = "5.3.3"
BOOTSWATCH_VERSION = "5.3.3"
FONTAWESOME_VERSION = "6.5.2"
FLAG_ICONS_VERSION = "7.2.3"
SWAGGER_UI_VERSION = "5"
SOCKET_IO_VERSION = "4.7.5"

BOOTSTRAP_THEMES = (
    "default",
    "flatly",
    "litera",
    "lumen",
    "minty",
    "sketchy",
    "solar",
    "spacelab",
    "united",
    "zephyr",
)

STATIC_ASSETS = {
    "bootstrap_js": {
        "local": f"{LIBS_STATIC_DIR}/bootstrap/{BOOTSTRAP_VERSION}/js/bootstrap.bundle.min.js",
        "cdn": f"https://cdn.jsdelivr.net/npm/bootstrap@{BOOTSTRAP_VERSION}/dist/js/bootstrap.bundle.min.js",
    },
    "fontawesome_css": {
        "local": f"{LIBS_STATIC_DIR}/fontawesome/{FONTAWESOME_VERSION}/css/all.min.css",
        "cdn": f"https://cdnjs.cloudflare.com/ajax/libs/font-awesome/{FONTAWESOME_VERSION}/css/all.min.css",
    },
    "flag_icons_css": {
        "local": f"{LIBS_STATIC_DIR}/flag-icons/{FLAG_ICONS_VERSION}/css/flag-icons.min.css",
        "cdn": f"https://cdn.jsdelivr.net/gh/lipis/flag-icons@{FLAG_ICONS_VERSION}/css/flag-icons.min.css",
    },
    "socket_io_js": {
        "local": f"{LIBS_STATIC_DIR}/socket.io/{SOCKET_IO_VERSION}/socket.io.min.js",
        "cdn": f"https://cdn.socket.io/{SOCKET_IO_VERSION}/socket.io.min.js",
    },
    "swagger_css": {
        "local": f"{LIBS_STATIC_DIR}/swagger-ui/{SWAGGER_UI_VERSION}/swagger-ui.css",
        "cdn": f"https://cdn.jsdelivr.net/npm/swagger-ui-dist@{SWAGGER_UI_VERSION}/swagger-ui.css",
    },
    "swagger_js": {
        "local": f"{LIBS_STATIC_DIR}/swagger-ui/{SWAGGER_UI_VERSION}/swagger-ui-bundle.js",
        "cdn": f"https://cdn.jsdelivr.net/npm/swagger-ui-dist@{SWAGGER_UI_VERSION}/swagger-ui-bundle.js",
    },
}


def bootstrap_css_asset(theme: str | None = None) -> dict[str, str]:
    theme = theme if theme in BOOTSTRAP_THEMES else "default"
    if theme == "default":
        return {
            "local": f"{LIBS_STATIC_DIR}/bootstrap/{BOOTSTRAP_VERSION}/css/bootstrap.min.css",
            "cdn": f"https://cdn.jsdelivr.net/npm/bootstrap@{BOOTSTRAP_VERSION}/dist/css/bootstrap.min.css",
        }
    return {
        "local": f"{LIBS_STATIC_DIR}/bootswatch/{BOOTSWATCH_VERSION}/{theme}/bootstrap.min.css",
        "cdn": f"https://cdn.jsdelivr.net/npm/bootswatch@{BOOTSWATCH_VERSION}/dist/{theme}/bootstrap.min.css",
    }


def asset_path(key: str) -> str:
    return STATIC_ASSETS[key]["local" if USE_OFFLINE_LIBS else "cdn"]


def bootstrap_css_path(theme: str | None = None) -> str:
    return bootstrap_css_asset(theme)["local" if USE_OFFLINE_LIBS else "cdn"]


def required_offline_paths() -> list[Path]:
    paths = [LIBS_DIR.parent / item["local"] for item in STATIC_ASSETS.values()]
    paths.extend(LIBS_DIR.parent / bootstrap_css_asset(theme)["local"] for theme in BOOTSTRAP_THEMES)
    return paths


def missing_offline_paths() -> list[Path]:
    missing = [path for path in required_offline_paths() if not path.is_file() or path.stat().st_size <= 0]
    # Notatka: sprawdzane są też zasoby referencjonowane przez CSS, np. fonty ikon i pliki flag.
    required_dirs = [
        LIBS_DIR / f"fontawesome/{FONTAWESOME_VERSION}/webfonts",
        LIBS_DIR / f"flag-icons/{FLAG_ICONS_VERSION}/flags/4x3",
        LIBS_DIR / f"flag-icons/{FLAG_ICONS_VERSION}/flags/1x1",
    ]
    for directory in required_dirs:
        if not directory.is_dir() or not any(directory.iterdir()):
            missing.append(directory)
    return missing


def validate_offline_assets() -> None:
    # Notatka: aplikacja zatrzymuje start, gdy tryb offline jest aktywny, a pliki nie są zainstalowane.
    if not USE_OFFLINE_LIBS:
        return
    missing = missing_offline_paths()
    if missing:
        preview = "\n".join(f"- {path.relative_to(BASE_DIR)}" for path in missing[:20])
        extra = "" if len(missing) <= 20 else f"\n- ... and {len(missing) - 20} more"
        raise RuntimeError(
            "PYTORRENT_USE_OFFLINE_LIBS=true, but frontend libraries are missing. "
            "Run: ./scripts/download_frontend_libs.py or ./install.sh\n"
            f"Missing files:\n{preview}{extra}"
        )