#!/usr/bin/env python3
"""Create a Gitea issue using env vars or a local env file."""

from __future__ import annotations

import argparse
import json
import sys
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 request_json(method: str, url: str, token: str, payload: dict[str, Any] | None = None) -> Any:
    data = None if payload is None else json.dumps(payload).encode("utf-8")
    request = urllib.request.Request(url, data=data, method=method)
    request.add_header("Authorization", f"token {token}")
    request.add_header("Accept", "application/json")
    if payload is not None:
        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 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 get_label_ids(base_url: str, owner: str, repo: str, token: str, names: list[str]) -> list[int]:
    if not names:
        return []

    labels = request_json("GET", api_url(base_url, owner, repo, "labels?limit=1000"), token)
    by_name = {label["name"]: label["id"] for label in labels}
    missing = [name for name in names if name not in by_name]
    if missing:
        raise SystemExit(
            "Missing Gitea labels: "
            + ", ".join(missing)
            + "\nCreate those labels first, then rerun the issue creation."
        )
    return [by_name[name] for name in names]


def main() -> int:
    parser = argparse.ArgumentParser(description="Create an issue in the configured Gitea repo.")
    parser.add_argument("--title", required=True)
    parser.add_argument("--body", default="")
    parser.add_argument("--body-file", type=Path)
    parser.add_argument("--label", action="append", default=[])
    parser.add_argument("--env-file", type=Path, default=DEFAULT_ENV_FILE)
    args = parser.parse_args()

    cfg = config(args.env_file.expanduser())
    body = args.body
    if args.body_file:
        body = args.body_file.read_text(encoding="utf-8")

    label_ids = get_label_ids(
        cfg["GITEA_BASE_URL"],
        cfg["GITEA_OWNER"],
        cfg["GITEA_REPO"],
        cfg["GITEA_TOKEN"],
        args.label,
    )

    issue = request_json(
        "POST",
        api_url(cfg["GITEA_BASE_URL"], cfg["GITEA_OWNER"], cfg["GITEA_REPO"], "issues"),
        cfg["GITEA_TOKEN"],
        {"title": args.title, "body": body, "labels": label_ids},
    )
    print(issue.get("html_url") or issue.get("url") or json.dumps(issue, indent=2))
    return 0


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