#!/usr/bin/env python3
"""Read a Gitea issue and print a compact Markdown summary."""

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) -> Any:
    request = urllib.request.Request(url, method=method)
    request.add_header("Authorization", f"token {token}")
    request.add_header("Accept", "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 issue_line(issue: dict[str, Any]) -> str:
    return f"#{issue['number']} {issue['title']} ({issue['state']}) - {issue['html_url']}"


def print_issue(issue: dict[str, Any], dependencies: list[dict[str, Any]], comments: list[dict[str, Any]] | None) -> None:
    labels = [label["name"] for label in issue.get("labels", [])]

    print(f"# Issue #{issue['number']}: {issue['title']}")
    print()
    print(f"- URL: {issue['html_url']}")
    print(f"- State: {issue['state']}")
    print(f"- Labels: {', '.join(labels) if labels else '(none)'}")
    print(f"- Created: {issue.get('created_at')}")
    print(f"- Updated: {issue.get('updated_at')}")
    print()
    print("## Body")
    print()
    print(issue.get("body") or "(empty)")
    print()
    print("## Dependencies")
    print()
    if dependencies:
        for dependency in sorted(dependencies, key=lambda item: item["number"]):
            print(f"- {issue_line(dependency)}")
    else:
        print("(none)")

    if comments is not None:
        print()
        print("## Comments")
        print()
        if comments:
            for comment in comments:
                user = comment.get("user", {}).get("login", "unknown")
                print(f"### Comment by {user} at {comment.get('created_at')}")
                print()
                print(comment.get("body") or "(empty)")
                print()
        else:
            print("(none)")


def main() -> int:
    parser = argparse.ArgumentParser(description="Read an issue in the configured Gitea repo.")
    parser.add_argument("--issue", type=int, required=True)
    parser.add_argument("--comments", action="store_true", help="Include issue comments.")
    parser.add_argument("--env-file", type=Path, default=DEFAULT_ENV_FILE)
    args = parser.parse_args()

    cfg = config(args.env_file.expanduser())
    issue = request_json(
        "GET",
        api_url(cfg["GITEA_BASE_URL"], cfg["GITEA_OWNER"], cfg["GITEA_REPO"], f"issues/{args.issue}"),
        cfg["GITEA_TOKEN"],
    )
    dependencies = request_json(
        "GET",
        api_url(
            cfg["GITEA_BASE_URL"],
            cfg["GITEA_OWNER"],
            cfg["GITEA_REPO"],
            f"issues/{args.issue}/dependencies?limit=1000",
        ),
        cfg["GITEA_TOKEN"],
    )
    comments = None
    if args.comments:
        comments = request_json(
            "GET",
            api_url(
                cfg["GITEA_BASE_URL"],
                cfg["GITEA_OWNER"],
                cfg["GITEA_REPO"],
                f"issues/{args.issue}/comments?limit=1000",
            ),
            cfg["GITEA_TOKEN"],
        )

    print_issue(issue, dependencies, comments)
    return 0


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