#!/usr/bin/env python3
"""
Update Twitch channel info (game + title) for the broadcaster account.

  ./set-channel.py --game-id 517520 "Slayer is back — Nightmare run"
  ./set-channel.py "Doom Eternal" "..."          # exact-name lookup, fails if no exact hit
  ./set-channel.py --dry-run --game-id 517520 "..."

For free-form / fuzzy game queries, use search-game.py first to resolve the
id (loading.sh does this automatically). The /helix/games?name= fallback in
this script is exact-and-case-sensitive.

Loads `.env.ophi118` — see _twitch.py for the env contract. The token MUST
belong to the broadcaster (Twitch enforces broadcaster_id == token user_id
on PATCH /helix/channels), so this script intentionally targets that file
and not `.env` (which holds the chat-bot's account).
"""

import json
import sys
import urllib.parse

import _twitch as tw

TITLE_LIMIT = 140


def lookup_game_id(env: dict, name: str) -> str:
    qs = urllib.parse.urlencode({"name": name})
    status, body = tw.auth_call("GET", f"{tw.HELIX}/games?{qs}", env)
    if status != 200:
        raise RuntimeError(f"games lookup failed (status={status}): {body}")
    data = (body or {}).get("data") or []
    if not data:
        raise RuntimeError(
            f"no Twitch game matches {name!r} exactly. /helix/games?name= is "
            f"case-sensitive — use search-game.py for fuzzy lookup."
        )
    return data[0]["id"]


def patch_channel(env: dict, game_id: str, title: str) -> None:
    qs = urllib.parse.urlencode({"broadcaster_id": env["TWITCH_BROADCASTER_ID"]})
    payload = json.dumps({"game_id": game_id, "title": title})
    status, body = tw.auth_call("PATCH", f"{tw.HELIX}/channels?{qs}", env, body=payload)
    if status not in (200, 204):
        raise RuntimeError(f"channel update failed (status={status}): {body}")


def usage_and_die():
    print("usage: set-channel.py [--dry-run] (--game-id <id> | <game-name>) <title>",
          file=sys.stderr)
    sys.exit(2)


def main():
    args = sys.argv[1:]
    dry  = False
    if args and args[0] == "--dry-run":
        dry, args = True, args[1:]

    game_id = None
    if args and args[0] == "--game-id":
        if len(args) < 3:
            usage_and_die()
        game_id, args = args[1], args[2:]

    expected = 1 if game_id else 2
    if len(args) != expected:
        usage_and_die()

    if game_id:
        title = args[0][:TITLE_LIMIT]
    else:
        game_name = args[0]
        title     = args[1][:TITLE_LIMIT]

    env = tw.load_env()
    needed = ("TWITCH_ACCESS_TOKEN", "TWITCH_REFRESH_TOKEN",
              "TWITCH_CLIENT_ID", "TWITCH_BROADCASTER_ID")
    missing = [k for k in needed if not env.get(k)]
    if missing:
        print(f"[err] missing in {tw.ENV_FILE.name}: {', '.join(missing)}", file=sys.stderr)
        sys.exit(1)

    if game_id is None:
        game_id = lookup_game_id(env, game_name)

    if dry:
        print(f"  ✓ dry-run: would set game_id={game_id}, title={title!r} (no PATCH issued)")
        return

    patch_channel(env, game_id, title)
    print(f"  ✓ Twitch channel updated → game_id={game_id}, title={title!r}")


if __name__ == "__main__":
    try:
        main()
    except Exception as e:
        print(f"[err] {type(e).__name__}: {e}", file=sys.stderr)
        sys.exit(1)