"""Persistent user configuration: the configured stream.jw.org link and the
autostart-at-login toggle."""
import json
import os
import re
import shutil

XDG_CONFIG_HOME = os.environ.get("XDG_CONFIG_HOME", os.path.expanduser("~/.config"))
CONFIG_DIR = os.path.join(XDG_CONFIG_HOME, "assembly-player")
CONFIG_PATH = os.path.join(CONFIG_DIR, "config.json")

AUTOSTART_DIR = os.path.join(XDG_CONFIG_HOME, "autostart")
AUTOSTART_PATH = os.path.join(AUTOSTART_DIR, "assembly-player.desktop")

DEFAULT_URL = "https://stream.jw.org/9021-8224-3277-8078"

_URL_RE = re.compile(r"^https://stream\.jw\.org/[A-Za-z0-9-]+/?$")


def is_valid_stream_url(url):
    return bool(_URL_RE.match(url.strip()))


def assembly_code(url):
    """Extract the trailing code (e.g. 9021-8224-3277-8078) used as a state key."""
    return url.strip().rstrip("/").rsplit("/", 1)[-1]


def load():
    if not os.path.exists(CONFIG_PATH):
        return {"url": DEFAULT_URL, "autostart": False, "start_minimized": False, "start_fullscreen": False}
    with open(CONFIG_PATH, "r", encoding="utf-8") as f:
        data = json.load(f)
    data.setdefault("url", DEFAULT_URL)
    data.setdefault("autostart", False)
    data.setdefault("start_minimized", False)
    data.setdefault("start_fullscreen", False)
    return data


def save(config):
    os.makedirs(CONFIG_DIR, exist_ok=True)
    tmp_path = CONFIG_PATH + ".tmp"
    with open(tmp_path, "w", encoding="utf-8") as f:
        json.dump(config, f, indent=2, ensure_ascii=False)
    os.replace(tmp_path, CONFIG_PATH)


def _find_installed_desktop_file():
    """Locate the installed launcher .desktop file so autostart uses the exact
    same Exec= / Icon= the user installed (user prefix or system prefix)."""
    candidates = [
        os.path.expanduser("~/.local/share/applications/assembly-player.desktop"),
        "/usr/local/share/applications/assembly-player.desktop",
        "/usr/share/applications/assembly-player.desktop",
    ]
    for path in candidates:
        if os.path.exists(path):
            return path
    return None


def set_autostart(enabled):
    if not enabled:
        if os.path.exists(AUTOSTART_PATH):
            os.remove(AUTOSTART_PATH)
        return

    os.makedirs(AUTOSTART_DIR, exist_ok=True)
    source = _find_installed_desktop_file()
    if source is None:
        raise RuntimeError(
            "Aucun fichier .desktop installé n'a été trouvé. "
            "Lancez d'abord 'make install' avant d'activer le démarrage automatique."
        )
    with open(source, "r", encoding="utf-8") as f:
        content = f.read()
    # Start hidden in the tray and silently resume playback, instead of
    # popping a window in the user's face right after login.
    content = content.replace("Exec=assembly-player", "Exec=assembly-player --minimized")
    content += "X-GNOME-Autostart-enabled=true\n"
    with open(AUTOSTART_PATH, "w", encoding="utf-8") as f:
        f.write(content)


def is_autostart_enabled():
    return os.path.exists(AUTOSTART_PATH)