from __future__ import annotations

import json
from typing import Any, Callable
from urllib.request import Request, urlopen


Transport = Callable[..., dict[str, Any]]


class GiteaProvider:
    def __init__(
        self,
        *,
        base_url: str,
        token: str,
        transport: Transport | None = None,
    ) -> None:
        self.base_url = base_url.rstrip("/")
        self.token = token
        self.transport = transport

    def _request(
        self,
        *,
        method: str,
        path: str,
        body: dict[str, object] | None = None,
    ) -> dict[str, Any]:
        url = f"{self.base_url}{path}"
        headers = {
            "Authorization": f"token {self.token}",
            "Accept": "application/json",
            "Content-Type": "application/json",
        }

        if self.transport is not None:
            return self.transport(method=method, url=url, headers=headers, body=body)

        payload = None if body is None else json.dumps(body).encode("utf-8")
        request = Request(url, method=method, headers=headers, data=payload)
        with urlopen(request, timeout=30) as response:
            raw = response.read().decode("utf-8")
        return json.loads(raw) if raw else {}

    def get_issue(self, repo: str, issue_number: int) -> dict[str, Any]:
        return self._request(
            method="GET",
            path=f"/api/v1/repos/{repo}/issues/{issue_number}",
        )

    def post_issue_comment(
        self,
        repo: str,
        issue_number: int,
        body: str,
    ) -> dict[str, Any]:
        return self._request(
            method="POST",
            path=f"/api/v1/repos/{repo}/issues/{issue_number}/comments",
            body={"body": body},
        )

    def parse_issue_comment_event(self, payload: dict[str, Any]) -> dict[str, Any]:
        repository = payload.get("repository") or {}
        issue = payload.get("issue") or {}
        comment = payload.get("comment") or {}

        return {
            "repo": repository.get("full_name", ""),
            "issue_number": int(issue.get("number", 0)),
            "comment_body": str(comment.get("body", "")),
        }