import sys

import requests

REPOSITORY = "https://github.com/freedomofpress/dangerzone/"
TEMPLATE = "- {title} ([#{number}]({url}))"


def get_prs_since_last_release(owner, repo):
    session = requests.Session()
    session.headers["Accept"] = "application/vnd.github.v3+json"

    # Try to get latest release
    response = session.get(
        f"https://api.github.com/repos/{owner}/{repo}/releases/latest"
    )
    since = None
    if response.ok:
        since = response.json()["published_at"]

    # Get merged PRs
    response = session.get(
        f"https://api.github.com/repos/{owner}/{repo}/pulls",
        params={
            "state": "closed",
            "sort": "updated",
            "direction": "desc",
            "per_page": 100,
        },
    )
    response.raise_for_status()

    prs = []
    for pr in response.json():
        if not pr["merged_at"]:
            continue
        if since and pr["merged_at"] <= since:
            break

        prs.append(
            TEMPLATE.format(title=pr["title"], number=pr["number"], url=pr["html_url"])
        )

    return prs


def main():
    try:
        url_path = REPOSITORY.rstrip("/").split("github.com/")[1]
        owner, repo = url_path.split("/")[-2:]
    except (ValueError, IndexError):
        print("Error: Invalid GitHub URL", file=sys.stderr)
        sys.exit(1)

    try:
        notes = get_prs_since_last_release(owner, repo)
        print("\n".join(notes))
    except requests.exceptions.HTTPError as e:
        print(f"Error: {e.response.json().get('message', str(e))}", file=sys.stderr)
        sys.exit(1)
    except Exception as e:
        print(f"Error: {e}", file=sys.stderr)
        sys.exit(1)


if __name__ == "__main__":
    main()