import asyncio
import logging
import sys
from datetime import datetime

from aiohttp import web
from aiogram import Bot, Dispatcher
from aiogram.client.default import DefaultBotProperties
from aiogram.enums import ParseMode
from aiogram.fsm.storage.memory import MemoryStorage
from aiogram.webhook.aiohttp_server import (
    SimpleRequestHandler,
    setup_application,
)

from config import config
from database.db import init_db
from handlers import admin, owner, user

# ─────────────────────────── LOGGING ─────────────────────────────────────

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s | %(levelname)-8s | %(name)s: %(message)s",
    datefmt="%Y-%m-%d %H:%M:%S",
    stream=sys.stdout,
)
logger = logging.getLogger(__name__)

BOT_STATUS = {"running": False, "started_at": None, "error": None}

# Webhook path — Telegram will POST updates here
WEBHOOK_PATH = "/webhook"


# ─────────────────────────── HEALTH ENDPOINTS ────────────────────────────

async def handle_root(request: web.Request) -> web.Response:
    status = "✅ running" if BOT_STATUS["running"] else "⏳ starting"
    error  = f"\n❌ Last error: {BOT_STATUS['error']}" if BOT_STATUS["error"] else ""
    # ملاحظة للمستخدم في الصفحة الرئيسية
    manual_notice = "\n\n💡 Note: Webhook is set manually to bypass HF outbound block."
    body = (
        f"🤖 Knowledge Base Bot — {status}\n"
        f"🕒 Server time : {datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S')} UTC\n"
        f"🚀 Bot started : {BOT_STATUS['started_at'] or 'not yet'}"
        f"{error}{manual_notice}"
    )
    return web.Response(text=body, content_type="text/plain", status=200)


async def handle_health(request: web.Request) -> web.Response:
    import json
    payload = {
        "status" : "ok" if BOT_STATUS["running"] else "starting",
        "bot_ok" : BOT_STATUS["running"],
        "started": BOT_STATUS["started_at"],
        "error"  : BOT_STATUS["error"],
    }
    return web.Response(
        text=json.dumps(payload),
        content_type="application/json",
        status=200,
    )


# ─────────────────────────── DISPATCHER ──────────────────────────────────

def build_dispatcher() -> Dispatcher:
    dp = Dispatcher(storage=MemoryStorage())
    dp.include_router(owner.router)
    dp.include_router(admin.router)
    dp.include_router(user.router)
    return dp


# ─────────────────────────── MAIN ────────────────────────────────────────

async def main() -> None:
    print(f"\n{'='*50}")
    print(f"  Startup at {datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S')} UTC")
    print(f"{'='*50}\n")

    # ── 1. Validate config ────────────────────────────────────
    try:
        config.validate()
    except EnvironmentError as e:
        logger.critical(str(e))
        BOT_STATUS["error"] = str(e)
        app = web.Application()
        app.router.add_get("/", handle_root)
        runner = web.AppRunner(app)
        await runner.setup()
        await web.TCPSite(runner, config.WEB_HOST, config.WEB_PORT).start()
        while True:
            await asyncio.sleep(3600)

    # ── 2. Database with retry ────────────────────────────────
    for attempt in range(1, 6):
        try:
            logger.info(f"🔌 DB connect attempt {attempt}/5…")
            await init_db()
            logger.info("✅ Database ready.")
            break
        except Exception as exc:
            BOT_STATUS["error"] = str(exc)
            logger.error(f"❌ DB failed: {exc}")
            if attempt < 5:
                await asyncio.sleep(5)
            else:
                logger.critical("💥 DB unavailable.")
                break

    # ── 3. Bot Setup ──────────────────────────────────────────
    bot = Bot(
        token=config.BOT_TOKEN,
        default=DefaultBotProperties(parse_mode=ParseMode.HTML),
    )

    dp = build_dispatcher()

    # ⚠️ تم تعطيل الحذف والتسجيل التلقائي للويب هوك هنا لتجنب حجب HF
    # التسجيل يتم يدوياً من المتصفح كما فعلت سابقاً
    logger.info("ℹ️ Skipping automatic webhook registration (HF compatibility mode).")
    
    BOT_STATUS["running"]    = True
    BOT_STATUS["started_at"] = datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S UTC")
    BOT_STATUS["error"]      = None

    # ── 4. aiohttp app with webhook handler ───────────────────
    app = web.Application()

    # Health endpoints
    app.router.add_get("/",       handle_root)
    app.router.add_get("/health", handle_health)

    # تسجيل معالج الويب هوك (هذا يجعل البوت "يسمع" للرسائل القادمة)
    SimpleRequestHandler(dispatcher=dp, bot=bot).register(app, path=WEBHOOK_PATH)
    setup_application(app, dp, bot=bot)

    # ── 5. Start server ───────────────────────────────────────
    runner = web.AppRunner(app)
    await runner.setup()
    site = web.TCPSite(runner, host=config.WEB_HOST, port=config.WEB_PORT)
    await site.start()
    
    logger.info(f"🚀 Server is UP on http://{config.WEB_HOST}:{config.WEB_PORT}/")
    logger.info(f"📡 Waiting for Telegram updates via: {config.WEBHOOK_URL}{WEBHOOK_PATH}")

    # Keep running forever
    while True:
        await asyncio.sleep(3600)


if __name__ == "__main__":
    try:
        asyncio.run(main())
    except KeyboardInterrupt:
        logger.info("👋 Shutdown by user.")