import os
import json
from github import Github
from dotenv import load_dotenv


LABELS_DIR = "labels"


def _get_repo():
    load_dotenv(override=True)
    repo_name = os.getenv("GITHUB_REPO")
    if not repo_name:
        raise RuntimeError("GITHUB_REPO env var is not set")
    g = Github(os.getenv("GITHUB_TOKEN"))
    return g.get_repo(repo_name)


def list_completed_keys() -> set:
    """Session keys ("{pid}_{sid}") that already have a submitted label file
    in the GitHub repo's labels/ directory. Returns an empty set (rather than
    raising) if the repo/labels dir isn't reachable yet, so the app still
    works before it's configured or if the directory doesn't exist yet."""
    try:
        repo = _get_repo()
        contents = repo.get_contents(LABELS_DIR, ref="main")
        return {os.path.splitext(c.name)[0] for c in contents}
    except Exception:
        return set()


def upload_label(key: str, payload: dict):
    """Create labels/{key}.json in the GitHub repo. Uses create (not update)
    so a second submission for an already-completed session fails loudly
    instead of silently overwriting someone else's labels."""
    path = f"{LABELS_DIR}/{key}.json"
    content = json.dumps(payload, ensure_ascii=False, indent=2)
    try:
        repo = _get_repo()
        try:
            repo.get_contents(path, ref="main")
            return False, "⚠️ 이미 다른 사람이 이 세션을 완료했습니다. 새 세션을 받아주세요."
        except Exception:
            pass
        repo.create_file(path, f"feat: add labels for {key}", content, branch="main")
        return True, "✅ 제출 완료! 감사합니다."
    except Exception as e:
        return False, f"❌ 업로드 실패: {e}"