"""Gitea-specific bot command handler."""

from __future__ import annotations

import asyncio
import logging
from collections.abc import Callable, Coroutine
from typing import Any

from ..database.models import (
    CommandConfig, CommandTracker, ServiceProvider, TelegramBot,
)
from ..services import make_gitea_provider
from ..services.http_session import get_http_session
from .base import CommandResponse, ProviderCommandHandler
from .command_utils import get_last_event_str, get_tracked_collection_ids, get_trackers_for_provider
from .handler import _render_cmd_template

_LOGGER = logging.getLogger(__name__)

_GITEA_COMMANDS = {"status", "repos", "issues", "prs", "commits"}


def _get_tracked_repos(
    provider: ServiceProvider,
    trackers: list,
) -> list[tuple[ServiceProvider, str, str]]:
    """Get (provider, owner, repo) tuples from tracked collection_ids."""
    if not provider.config.get("api_token"):
        return []
    collection_ids = get_tracked_collection_ids(provider, trackers)
    repos: list[tuple[ServiceProvider, str, str]] = []
    for full_name in collection_ids:
        parts = full_name.split("/", 1)
        if len(parts) == 2:
            repos.append((provider, parts[0], parts[1]))
    return repos


# ---------------------------------------------------------------------------
# Command dispatch table
# ---------------------------------------------------------------------------

_TEXT_COMMANDS: dict[str, Callable[..., Coroutine[Any, Any, dict[str, Any]]]] = {}


def _text_cmd(fn: Callable[..., Coroutine[Any, Any, dict[str, Any]]]) -> Callable[..., Coroutine[Any, Any, dict[str, Any]]]:
    """Register a function in the text command dispatch table."""
    name = fn.__name__.removeprefix("_cmd_")
    _TEXT_COMMANDS[name] = fn
    return fn


class GiteaCommandHandler(ProviderCommandHandler):
    """Handles Gitea-specific bot commands."""

    provider_type = "gitea"

    def get_provider_commands(self) -> set[str]:
        return _GITEA_COMMANDS

    def get_rate_categories(self) -> dict[str, str]:
        return {
            "repos": "api", "issues": "api",
            "prs": "api", "commits": "api",
        }

    async def handle(
        self,
        cmd: str,
        args: str,
        count: int,
        locale: str,
        response_mode: str,
        provider: ServiceProvider,
        cmd_templates: dict[str, dict[str, str]],
        bot: TelegramBot,
        tracker: CommandTracker,
        config: CommandConfig,
    ) -> CommandResponse | None:
        fn = _TEXT_COMMANDS.get(cmd)
        if fn is None:
            return None
        ctx = await fn(provider, count)
        return CommandResponse(text=_render_cmd_template(cmd_templates, cmd, locale, ctx))


@_text_cmd
async def _cmd_status(provider: ServiceProvider, count: int) -> dict[str, Any]:
    trackers = await get_trackers_for_provider(provider.id)
    tracked_repos = _get_tracked_repos(provider, trackers)

    # Get server version
    server_version = "unknown"
    if provider.config.get("api_token"):
        http = await get_http_session()
        gitea = make_gitea_provider(http, provider)
        version = await gitea.client.get_server_version()
        if version:
            server_version = version

    tracker_ids = [t.id for t in trackers]
    last_str = await get_last_event_str(tracker_ids)

    return {
        "repos_count": len(tracked_repos),
        "server_version": server_version,
        "last_event": last_str,
    }


@_text_cmd
async def _cmd_repos(provider: ServiceProvider, count: int) -> dict[str, Any]:
    trackers = await get_trackers_for_provider(provider.id)
    tracked_repos = _get_tracked_repos(provider, trackers)

    repos_data: list[dict[str, Any]] = []
    http = await get_http_session()

    async def _fetch_repo(prov: ServiceProvider, owner: str, repo: str) -> dict[str, Any]:
        gitea = make_gitea_provider(http, prov)
        # Use direct get_repo endpoint instead of listing all repos
        r = await gitea.client.get_repo(owner, repo)
        if r:
            return {
                "full_name": r.get("full_name", ""),
                "description": r.get("description", ""),
                "stars": r.get("stars_count", 0),
                "url": r.get("html_url", ""),
            }
        return {
            "full_name": f"{owner}/{repo}",
            "description": "",
            "stars": 0,
            "url": "",
        }

    tasks = [_fetch_repo(prov, owner, repo) for prov, owner, repo in tracked_repos]
    results = await asyncio.gather(*tasks, return_exceptions=True)
    for (prov, owner, repo), result in zip(tracked_repos, results):
        if isinstance(result, Exception):
            _LOGGER.warning("Failed to fetch repo %s/%s: %s", owner, repo, result)
            repos_data.append({
                "full_name": f"{owner}/{repo}",
                "description": "?",
                "stars": 0,
                "url": "",
            })
        else:
            repos_data.append(result)

    return {"repos": repos_data}


@_text_cmd
async def _cmd_issues(provider: ServiceProvider, count: int) -> dict[str, Any]:
    trackers = await get_trackers_for_provider(provider.id)
    tracked_repos = _get_tracked_repos(provider, trackers)

    all_issues: list[dict[str, Any]] = []
    http = await get_http_session()

    async def _fetch_issues(prov: ServiceProvider, owner: str, repo: str) -> list[dict[str, Any]]:
        gitea = make_gitea_provider(http, prov)
        return await gitea.client.get_repo_issues(owner, repo, limit=count)

    tasks = [_fetch_issues(prov, owner, repo) for prov, owner, repo in tracked_repos]
    results = await asyncio.gather(*tasks, return_exceptions=True)
    for (prov, owner, repo), result in zip(tracked_repos, results):
        if isinstance(result, Exception):
            _LOGGER.warning("Failed to fetch issues for %s/%s: %s", owner, repo, result)
            continue
        for issue in result:
            all_issues.append({
                "repo": f"{owner}/{repo}",
                "number": issue.get("number", 0),
                "title": issue.get("title", ""),
                "url": issue.get("html_url", ""),
                "user": issue.get("user", {}).get("login", ""),
                "state": issue.get("state", ""),
            })

    all_issues.sort(key=lambda i: i.get("number", 0), reverse=True)
    return {"issues": all_issues[:count]}


@_text_cmd
async def _cmd_prs(provider: ServiceProvider, count: int) -> dict[str, Any]:
    trackers = await get_trackers_for_provider(provider.id)
    tracked_repos = _get_tracked_repos(provider, trackers)

    all_prs: list[dict[str, Any]] = []
    http = await get_http_session()

    async def _fetch_prs(prov: ServiceProvider, owner: str, repo: str) -> list[dict[str, Any]]:
        gitea = make_gitea_provider(http, prov)
        return await gitea.client.get_repo_pulls(owner, repo, limit=count)

    tasks = [_fetch_prs(prov, owner, repo) for prov, owner, repo in tracked_repos]
    results = await asyncio.gather(*tasks, return_exceptions=True)
    for (prov, owner, repo), result in zip(tracked_repos, results):
        if isinstance(result, Exception):
            _LOGGER.warning("Failed to fetch PRs for %s/%s: %s", owner, repo, result)
            continue
        for pr in result:
            all_prs.append({
                "repo": f"{owner}/{repo}",
                "number": pr.get("number", 0),
                "title": pr.get("title", ""),
                "url": pr.get("html_url", ""),
                "user": pr.get("user", {}).get("login", ""),
                "state": pr.get("state", ""),
            })

    all_prs.sort(key=lambda p: p.get("number", 0), reverse=True)
    return {"prs": all_prs[:count]}


@_text_cmd
async def _cmd_commits(provider: ServiceProvider, count: int) -> dict[str, Any]:
    trackers = await get_trackers_for_provider(provider.id)
    tracked_repos = _get_tracked_repos(provider, trackers)

    all_commits: list[dict[str, Any]] = []
    http = await get_http_session()

    async def _fetch_commits(prov: ServiceProvider, owner: str, repo: str) -> list[dict[str, Any]]:
        gitea = make_gitea_provider(http, prov)
        return await gitea.client.get_repo_commits(owner, repo, limit=count)

    tasks = [_fetch_commits(prov, owner, repo) for prov, owner, repo in tracked_repos]
    results = await asyncio.gather(*tasks, return_exceptions=True)
    for (prov, owner, repo), result in zip(tracked_repos, results):
        if isinstance(result, Exception):
            _LOGGER.warning("Failed to fetch commits for %s/%s: %s", owner, repo, result)
            continue
        for c in result:
            commit_data = c.get("commit", {})
            all_commits.append({
                "repo": f"{owner}/{repo}",
                "short_id": c.get("sha", "")[:7],
                "message": commit_data.get("message", "").split("\n")[0][:80],
                "author": commit_data.get("author", {}).get("name", ""),
                "url": c.get("html_url", ""),
            })

    return {"commits": all_commits[:count]}