#!/usr/bin/env python3
"""Make one Gitea issue depend on another issue."""

from __future__ import annotations

import argparse
import json
import urllib.error
import urllib.parse
import urllib.request
from pathlib import Path
from typing import Any

from gitea_common import DEFAULT_ENV_FILE, config


def api_url(base_url: str, owner: str, repo: str, suffix: str) -> str:
    encoded_owner = urllib.parse.quote(owner, safe="")
    encoded_repo = urllib.parse.quote(repo, safe="")
    return f"{base_url.rstrip('/')}/api/v1/repos/{encoded_owner}/{encoded_repo}/{suffix.lstrip('/')}"


def request_json(method: str, url: str, token: str, payload: dict[str, Any]) -> Any:
    request = urllib.request.Request(url, data=json.dumps(payload).encode("utf-8"), method=method)
    request.add_header("Authorization", f"token {token}")
    request.add_header("Accept", "application/json")
    request.add_header("Content-Type", "application/json")

    try:
        with urllib.request.urlopen(request, timeout=30) as response:
            body = response.read().decode("utf-8")
    except urllib.error.HTTPError as exc:
        error_body = exc.read().decode("utf-8", errors="replace")
        raise SystemExit(f"Gitea API request failed: HTTP {exc.code}\n{error_body}") from exc
    except urllib.error.URLError as exc:
        raise SystemExit(f"Gitea API request failed: {exc.reason}") from exc

    return json.loads(body) if body else None


def main() -> int:
    parser = argparse.ArgumentParser(description="Make a Gitea issue depend on another issue.")
    parser.add_argument("--parent", type=int, required=True, help="Issue number that is blocked.")
    parser.add_argument("--child", type=int, required=True, help="Issue number the parent depends on.")
    parser.add_argument("--child-owner", help="Owner of the child issue repo. Defaults to GITEA_OWNER.")
    parser.add_argument("--child-repo", help="Repo of the child issue. Defaults to GITEA_REPO.")
    parser.add_argument("--env-file", type=Path, default=DEFAULT_ENV_FILE)
    args = parser.parse_args()

    cfg = config(args.env_file.expanduser())
    child_owner = args.child_owner or cfg["GITEA_OWNER"]
    child_repo = args.child_repo or cfg["GITEA_REPO"]

    issue = request_json(
        "POST",
        api_url(
            cfg["GITEA_BASE_URL"],
            cfg["GITEA_OWNER"],
            cfg["GITEA_REPO"],
            f"issues/{args.parent}/dependencies",
        ),
        cfg["GITEA_TOKEN"],
        {"owner": child_owner, "repo": child_repo, "index": args.child},
    )
    print(issue.get("html_url") or issue.get("url") or json.dumps(issue, indent=2))
    return 0


if __name__ == "__main__":
    raise SystemExit(main())