"""Main bridge: Telegram <-> Tracker."""

import asyncio
import logging
import httpx
from telegram import Update, Bot
from telegram.ext import (
    Application,
    MessageHandler,
    CommandHandler,
    ContextTypes,
    filters,
)

from config import Config
from topic_map import TopicMap
from tracker_client import TrackerClient

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(name)s] %(levelname)s: %(message)s",
)
logger = logging.getLogger(__name__)

config = Config()
config.validate()
topic_map = TopicMap()


# --- Tracker -> Telegram ---

async def on_tracker_event(event: dict):
    """Forward Tracker events to Telegram topics."""
    event_type = event.get("type", "")

    if event_type == "message.new":
        msg = event.get("message", {})
        author = msg.get("author", {})

        # Skip messages from bridge itself (avoid echo)
        if author.get("slug") == "bridge":
            return

        project_id = msg.get("project_id")
        if not project_id:
            return

        topic_id = topic_map.get_topic(project_id)
        if not topic_id:
            return

        author_name = author.get("name", author.get("slug", "???"))
        text = msg.get("text", "")
        if not text:
            return

        # Format: "Author: message"
        tg_text = f"<b>{_escape_html(author_name)}</b>: {_escape_html(text)}"
        await _send_to_topic(topic_id, tg_text)

    elif event_type == "task.created":
        task = event.get("task", {})
        project_id = task.get("project_id")
        topic_id = topic_map.get_topic(project_id) if project_id else None
        if not topic_id:
            return

        key = task.get("key", "?")
        title = task.get("title", "")
        tg_text = f"📋 Новая задача <b>{_escape_html(key)}</b>: {_escape_html(title)}"
        await _send_to_topic(topic_id, tg_text)


tracker = TrackerClient(config, on_message=on_tracker_event)


# --- Telegram -> Tracker ---

async def handle_telegram_message(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Forward Telegram messages to Tracker project chat."""
    message = update.effective_message
    if not message or not message.text:
        return

    # Only process messages from the configured group
    if message.chat_id != config.group_id:
        return

    thread_id = message.message_thread_id
    if not thread_id:
        return  # General topic — skip or handle separately

    project_uuid = topic_map.get_project(thread_id)
    if not project_uuid:
        logger.debug("No mapping for topic %d, ignoring", thread_id)
        return

    user = message.from_user
    sender = user.full_name if user else "Unknown"
    text = f"[{sender}] {message.text}"

    await tracker.send_message(project_uuid, text)
    logger.info("TG->Tracker: topic=%d project=%s", thread_id, project_uuid[:8])


async def cmd_link(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """/link <project_slug> — link current topic to a project."""
    message = update.effective_message
    if not message or message.chat_id != config.group_id:
        return

    thread_id = message.message_thread_id
    if not thread_id:
        await message.reply_text("⚠️ Эту команду можно использовать только в топике.")
        return

    args = context.args
    if not args:
        await message.reply_text("Использование: /link <project_slug>")
        return

    slug = args[0]

    # Look up project UUID by slug
    project_uuid = await _resolve_project(slug)
    if not project_uuid:
        await message.reply_text(f"❌ Проект '{slug}' не найден.")
        return

    topic_map.set(thread_id, project_uuid)
    await message.reply_text(f"✅ Топик привязан к проекту <b>{_escape_html(slug)}</b>", parse_mode="HTML")
    logger.info("Linked topic %d -> project %s (%s)", thread_id, slug, project_uuid[:8])


async def cmd_unlink(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """/unlink — unlink current topic from project."""
    message = update.effective_message
    if not message or message.chat_id != config.group_id:
        return

    thread_id = message.message_thread_id
    if not thread_id:
        await message.reply_text("⚠️ Эту команду можно использовать только в топике.")
        return

    topic_map.remove_by_topic(thread_id)
    await message.reply_text("✅ Привязка снята.")


async def cmd_status(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """/bridge_status — show bridge status and mappings."""
    message = update.effective_message
    if not message:
        return

    mappings = topic_map.all()
    if not mappings:
        await message.reply_text("Нет привязанных топиков.")
        return

    lines = ["<b>Привязки топик → проект:</b>"]
    for tid, puuid in mappings.items():
        lines.append(f"• topic {tid} → {puuid[:8]}...")
    await message.reply_text("\n".join(lines), parse_mode="HTML")


# --- Helpers ---

_bot: Bot | None = None


async def _send_to_topic(topic_id: int, text: str):
    """Send a message to a specific Telegram topic."""
    global _bot
    if _bot is None:
        _bot = Bot(config.bot_token)

    try:
        await _bot.send_message(
            chat_id=config.group_id,
            message_thread_id=topic_id,
            text=text,
            parse_mode="HTML",
        )
    except Exception as e:
        logger.error("Failed to send to topic %d: %s", topic_id, e)


def _escape_html(text: str) -> str:
    return text.replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")


async def _resolve_project(slug: str) -> str | None:
    """Look up project UUID by slug via Tracker API."""
    try:
        async with httpx.AsyncClient() as client:
            resp = await client.get(
                f"{config.tracker_url}/api/v1/projects",
                headers={"Authorization": f"Bearer {config.bridge_token}"},
            )
            if resp.status_code != 200:
                return None
            projects = resp.json()
            for p in projects:
                if p.get("slug") == slug:
                    return p.get("id")
    except Exception as e:
        logger.error("Failed to resolve project '%s': %s", slug, e)
    return None


# --- Main ---

async def main():
    """Start both Telegram bot and Tracker WS client."""
    app = Application.builder().token(config.bot_token).build()

    app.add_handler(CommandHandler("link", cmd_link))
    app.add_handler(CommandHandler("unlink", cmd_unlink))
    app.add_handler(CommandHandler("bridge_status", cmd_status))
    app.add_handler(MessageHandler(filters.TEXT & ~filters.COMMAND, handle_telegram_message))

    # Start Telegram polling in background
    await app.initialize()
    await app.start()
    await app.updater.start_polling(drop_pending_updates=True)

    logger.info("Bridge started! Telegram polling + Tracker WS")

    # Run Tracker WS client (blocks until stopped)
    try:
        await tracker.connect()
    finally:
        tracker.stop()
        await app.updater.stop()
        await app.stop()
        await app.shutdown()


if __name__ == "__main__":
    asyncio.run(main())