import logging
from typing import List

import httpx
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.config import settings
from app.models import User, Participant, Marathon

logger = logging.getLogger(__name__)


class TelegramNotifier:
    """Service for sending Telegram notifications."""

    def __init__(self):
        self.bot_token = settings.TELEGRAM_BOT_TOKEN
        self.api_url = f"https://api.telegram.org/bot{self.bot_token}"

    async def send_message(
        self,
        chat_id: int,
        text: str,
        parse_mode: str = "HTML",
        reply_markup: dict | None = None
    ) -> bool:
        """Send a message to a Telegram chat."""
        if not self.bot_token:
            logger.warning("Telegram bot token not configured")
            return False

        try:
            async with httpx.AsyncClient() as client:
                payload = {
                    "chat_id": chat_id,
                    "text": text,
                    "parse_mode": parse_mode
                }
                if reply_markup:
                    payload["reply_markup"] = reply_markup

                response = await client.post(
                    f"{self.api_url}/sendMessage",
                    json=payload,
                    timeout=10.0
                )
                if response.status_code == 200:
                    return True
                else:
                    logger.error(f"Failed to send message: {response.text}")
                    return False
        except Exception as e:
            logger.error(f"Error sending Telegram message: {e}")
            return False

    async def send_photo(
        self,
        chat_id: int,
        photo: bytes,
        caption: str | None = None,
        parse_mode: str = "HTML",
        filename: str = "photo.jpg",
        content_type: str = "image/jpeg"
    ) -> bool:
        """Send a photo to a Telegram chat."""
        if not self.bot_token:
            logger.warning("Telegram bot token not configured")
            return False

        try:
            timeout = httpx.Timeout(connect=30.0, read=60.0, write=120.0, pool=30.0)
            async with httpx.AsyncClient(timeout=timeout) as client:
                data = {"chat_id": str(chat_id)}
                if caption:
                    data["caption"] = caption
                    data["parse_mode"] = parse_mode

                files = {"photo": (filename, photo, content_type)}

                response = await client.post(
                    f"{self.api_url}/sendPhoto",
                    data=data,
                    files=files,
                )
                if response.status_code == 200:
                    return True
                else:
                    logger.error(f"Failed to send photo to {chat_id}: {response.status_code} - {response.text}")
                    return False
        except Exception as e:
            logger.error(f"Error sending Telegram photo to {chat_id}: {type(e).__name__}: {e}")
            return False

    async def send_video(
        self,
        chat_id: int,
        video: bytes,
        caption: str | None = None,
        parse_mode: str = "HTML",
        filename: str = "video.mp4",
        content_type: str = "video/mp4"
    ) -> bool:
        """Send a video to a Telegram chat."""
        if not self.bot_token:
            logger.warning("Telegram bot token not configured")
            return False

        try:
            timeout = httpx.Timeout(connect=30.0, read=120.0, write=300.0, pool=30.0)
            async with httpx.AsyncClient(timeout=timeout) as client:
                data = {"chat_id": str(chat_id)}
                if caption:
                    data["caption"] = caption
                    data["parse_mode"] = parse_mode

                files = {"video": (filename, video, content_type)}

                response = await client.post(
                    f"{self.api_url}/sendVideo",
                    data=data,
                    files=files,
                )
                if response.status_code == 200:
                    return True
                else:
                    logger.error(f"Failed to send video to {chat_id}: {response.status_code} - {response.text}")
                    return False
        except Exception as e:
            logger.error(f"Error sending Telegram video to {chat_id}: {type(e).__name__}: {e}")
            return False

    async def send_media_group(
        self,
        chat_id: int,
        media_items: list[dict],
        caption: str | None = None,
        parse_mode: str = "HTML"
    ) -> bool:
        """
        Send a media group (multiple photos/videos) to a Telegram chat.

        media_items: list of dicts with keys:
            - type: "photo" or "video"
            - data: bytes
            - filename: str
            - content_type: str
        """
        if not self.bot_token:
            logger.warning("Telegram bot token not configured")
            return False

        if not media_items:
            return False

        try:
            import json
            # Use longer timeouts for file uploads
            timeout = httpx.Timeout(
                connect=30.0,
                read=120.0,
                write=300.0,  # 5 minutes for uploading files
                pool=30.0
            )
            async with httpx.AsyncClient(timeout=timeout) as client:
                # Build media array and files dict
                media_array = []
                files_dict = {}

                for i, item in enumerate(media_items):
                    attach_name = f"media{i}"
                    media_obj = {
                        "type": item["type"],
                        "media": f"attach://{attach_name}"
                    }
                    # Only first item gets the caption
                    if i == 0 and caption:
                        media_obj["caption"] = caption
                        media_obj["parse_mode"] = parse_mode

                    media_array.append(media_obj)
                    files_dict[attach_name] = (
                        item.get("filename", f"file{i}"),
                        item["data"],
                        item.get("content_type", "application/octet-stream")
                    )

                data = {
                    "chat_id": str(chat_id),
                    "media": json.dumps(media_array)
                }

                logger.info(f"Sending media group to {chat_id}: {len(media_items)} files")
                response = await client.post(
                    f"{self.api_url}/sendMediaGroup",
                    data=data,
                    files=files_dict,
                )
                if response.status_code == 200:
                    logger.info(f"Successfully sent media group to {chat_id}")
                    return True
                else:
                    logger.error(f"Failed to send media group to {chat_id}: {response.status_code} - {response.text}")
                    return False
        except Exception as e:
            logger.error(f"Error sending Telegram media group to {chat_id}: {type(e).__name__}: {e}")
            return False

    async def send_media_message(
        self,
        chat_id: int,
        text: str | None = None,
        media_type: str | None = None,
        media_data: bytes | None = None,
        media_items: list[dict] | None = None,
        parse_mode: str = "HTML"
    ) -> bool:
        """
        Send a message with optional media.

        For single media: use media_type and media_data
        For multiple media: use media_items list with dicts containing:
            - type: "photo" or "video"
            - data: bytes
            - filename: str (optional)
            - content_type: str (optional)
        """
        # Multiple media - use media group
        if media_items and len(media_items) > 1:
            return await self.send_media_group(chat_id, media_items, text, parse_mode)

        # Single media from media_items
        if media_items and len(media_items) == 1:
            item = media_items[0]
            if item["type"] == "photo":
                return await self.send_photo(
                    chat_id, item["data"], text, parse_mode,
                    item.get("filename", "photo.jpg"),
                    item.get("content_type", "image/jpeg")
                )
            elif item["type"] == "video":
                return await self.send_video(
                    chat_id, item["data"], text, parse_mode,
                    item.get("filename", "video.mp4"),
                    item.get("content_type", "video/mp4")
                )

        # Legacy single media support
        if media_data and media_type:
            if media_type == "photo":
                return await self.send_photo(chat_id, media_data, text, parse_mode)
            elif media_type == "video":
                return await self.send_video(chat_id, media_data, text, parse_mode)

        if text:
            return await self.send_message(chat_id, text, parse_mode)

        return False

    async def notify_user(
        self,
        db: AsyncSession,
        user_id: int,
        message: str,
        reply_markup: dict | None = None
    ) -> bool:
        """Send notification to a user by user_id."""
        result = await db.execute(
            select(User).where(User.id == user_id)
        )
        user = result.scalar_one_or_none()

        if not user:
            logger.warning(f"[Notify] User {user_id} not found")
            return False

        if not user.telegram_id:
            logger.warning(f"[Notify] User {user_id} ({user.nickname}) has no telegram_id")
            return False

        logger.info(f"[Notify] Sending to user {user.nickname} (telegram_id={user.telegram_id})")
        return await self.send_message(user.telegram_id, message, reply_markup=reply_markup)

    async def notify_marathon_participants(
        self,
        db: AsyncSession,
        marathon_id: int,
        message: str,
        exclude_user_id: int | None = None,
        check_setting: str | None = None
    ) -> int:
        """Send notification to all marathon participants with linked Telegram.

        Args:
            check_setting: If provided, only send to users with this setting enabled.
                           Options: 'notify_events', 'notify_disputes', 'notify_moderation'
        """
        result = await db.execute(
            select(User)
            .join(Participant, Participant.user_id == User.id)
            .where(
                Participant.marathon_id == marathon_id,
                User.telegram_id.isnot(None)
            )
        )
        users = result.scalars().all()

        sent_count = 0
        for user in users:
            if exclude_user_id and user.id == exclude_user_id:
                continue
            # Check notification setting if specified
            if check_setting and not getattr(user, check_setting, True):
                logger.info(f"[Notify] Skipping user {user.nickname} - {check_setting} is disabled")
                continue
            if await self.send_message(user.telegram_id, message):
                sent_count += 1

        return sent_count

    # Notification templates
    async def notify_event_start(
        self,
        db: AsyncSession,
        marathon_id: int,
        event_type: str,
        marathon_title: str
    ) -> int:
        """Notify participants about event start (respects notify_events setting)."""
        event_messages = {
            "golden_hour": f"🌟 <b>Начался Golden Hour</b> в «{marathon_title}»!\n\nВсе очки x1.5 в течение часа!",
            "jackpot": f"🎰 <b>JACKPOT</b> в «{marathon_title}»!\n\nОчки x3 за следующий сложный челлендж!",
            "double_risk": f"⚡ <b>Double Risk</b> в «{marathon_title}»!\n\nПоловина очков, но дропы бесплатны!",
            "common_enemy": f"👥 <b>Common Enemy</b> в «{marathon_title}»!\n\nВсе получают одинаковый челлендж. Первые 3 — бонус!",
            "swap": f"🔄 <b>Swap</b> в «{marathon_title}»!\n\nМожно поменяться заданием с другим участником!",
            "game_choice": f"🎲 <b>Выбор игры</b> в «{marathon_title}»!\n\nВыбери игру и один из 3 челленджей!"
        }

        message = event_messages.get(
            event_type,
            f"📌 Новое событие в «{marathon_title}»!"
        )

        return await self.notify_marathon_participants(
            db, marathon_id, message, check_setting='notify_events'
        )

    async def notify_event_end(
        self,
        db: AsyncSession,
        marathon_id: int,
        event_type: str,
        marathon_title: str
    ) -> int:
        """Notify participants about event end (respects notify_events setting)."""
        event_names = {
            "golden_hour": "Golden Hour",
            "jackpot": "Jackpot",
            "double_risk": "Double Risk",
            "common_enemy": "Common Enemy",
            "swap": "Swap",
            "game_choice": "Выбор игры"
        }

        event_name = event_names.get(event_type, "Событие")
        message = f"⏰ <b>{event_name}</b> в «{marathon_title}» завершён"

        return await self.notify_marathon_participants(
            db, marathon_id, message, check_setting='notify_events'
        )

    async def notify_marathon_start(
        self,
        db: AsyncSession,
        marathon_id: int,
        marathon_title: str
    ) -> int:
        """Notify participants about marathon start."""
        message = (
            f"🚀 <b>Марафон «{marathon_title}» начался!</b>\n\n"
            f"Время крутить колесо и получить первое задание!"
        )
        return await self.notify_marathon_participants(db, marathon_id, message)

    async def notify_marathon_finish(
        self,
        db: AsyncSession,
        marathon_id: int,
        marathon_title: str
    ) -> int:
        """Notify participants about marathon finish."""
        message = (
            f"🏆 <b>Марафон «{marathon_title}» завершён!</b>\n\n"
            f"Зайди на сайт, чтобы увидеть итоговую таблицу!"
        )
        return await self.notify_marathon_participants(db, marathon_id, message)

    async def notify_dispute_raised(
        self,
        db: AsyncSession,
        user_id: int,
        marathon_title: str,
        challenge_title: str,
        assignment_id: int
    ) -> bool:
        """Notify user about dispute raised on their assignment (respects notify_disputes setting)."""
        # Check user's notification settings
        result = await db.execute(select(User).where(User.id == user_id))
        user = result.scalar_one_or_none()
        if user and not user.notify_disputes:
            logger.info(f"[Dispute] Skipping user {user.nickname} - notify_disputes is disabled")
            return False

        logger.info(f"[Dispute] Sending notification to user_id={user_id} for assignment_id={assignment_id}")

        dispute_url = f"{settings.FRONTEND_URL}/assignments/{assignment_id}"
        logger.info(f"[Dispute] URL: {dispute_url}")

        # Telegram requires HTTPS for inline keyboard URLs
        use_inline_button = dispute_url.startswith("https://")

        if use_inline_button:
            message = (
                f"⚠️ <b>На твоё задание подан спор</b>\n\n"
                f"Марафон: {marathon_title}\n"
                f"Задание: {challenge_title}"
            )
            reply_markup = {
                "inline_keyboard": [[
                    {"text": "Открыть спор", "url": dispute_url}
                ]]
            }
        else:
            message = (
                f"⚠️ <b>На твоё задание подан спор</b>\n\n"
                f"Марафон: {marathon_title}\n"
                f"Задание: {challenge_title}\n\n"
                f"🔗 {dispute_url}"
            )
            reply_markup = None

        result = await self.notify_user(db, user_id, message, reply_markup=reply_markup)
        logger.info(f"[Dispute] Notification result: {result}")
        return result

    async def notify_dispute_resolved(
        self,
        db: AsyncSession,
        user_id: int,
        marathon_title: str,
        challenge_title: str,
        is_valid: bool
    ) -> bool:
        """Notify user about dispute resolution (respects notify_disputes setting)."""
        # Check user's notification settings
        result = await db.execute(select(User).where(User.id == user_id))
        user = result.scalar_one_or_none()
        if user and not user.notify_disputes:
            logger.info(f"[Dispute] Skipping user {user.nickname} - notify_disputes is disabled")
            return False

        if is_valid:
            message = (
                f"❌ <b>Спор признан обоснованным</b>\n\n"
                f"Марафон: {marathon_title}\n"
                f"Задание: {challenge_title}\n\n"
                f"Задание возвращено. Выполни его заново."
            )
        else:
            message = (
                f"✅ <b>Спор отклонён</b>\n\n"
                f"Марафон: {marathon_title}\n"
                f"Задание: {challenge_title}\n\n"
                f"Твоё выполнение засчитано!"
            )
        return await self.notify_user(db, user_id, message)

    async def notify_game_approved(
        self,
        db: AsyncSession,
        user_id: int,
        marathon_title: str,
        game_title: str
    ) -> bool:
        """Notify user that their proposed game was approved (respects notify_moderation setting)."""
        # Check user's notification settings
        result = await db.execute(select(User).where(User.id == user_id))
        user = result.scalar_one_or_none()
        if user and not user.notify_moderation:
            logger.info(f"[Moderation] Skipping user {user.nickname} - notify_moderation is disabled")
            return False

        message = (
            f"✅ <b>Твоя игра одобрена!</b>\n\n"
            f"Марафон: {marathon_title}\n"
            f"Игра: {game_title}\n\n"
            f"Теперь она доступна для всех участников."
        )
        return await self.notify_user(db, user_id, message)

    async def notify_game_rejected(
        self,
        db: AsyncSession,
        user_id: int,
        marathon_title: str,
        game_title: str
    ) -> bool:
        """Notify user that their proposed game was rejected (respects notify_moderation setting)."""
        # Check user's notification settings
        result = await db.execute(select(User).where(User.id == user_id))
        user = result.scalar_one_or_none()
        if user and not user.notify_moderation:
            logger.info(f"[Moderation] Skipping user {user.nickname} - notify_moderation is disabled")
            return False

        message = (
            f"❌ <b>Твоя игра отклонена</b>\n\n"
            f"Марафон: {marathon_title}\n"
            f"Игра: {game_title}\n\n"
            f"Ты можешь предложить другую игру."
        )
        return await self.notify_user(db, user_id, message)

    async def notify_challenge_approved(
        self,
        db: AsyncSession,
        user_id: int,
        marathon_title: str,
        game_title: str,
        challenge_title: str
    ) -> bool:
        """Notify user that their proposed challenge was approved (respects notify_moderation setting)."""
        # Check user's notification settings
        result = await db.execute(select(User).where(User.id == user_id))
        user = result.scalar_one_or_none()
        if user and not user.notify_moderation:
            logger.info(f"[Moderation] Skipping user {user.nickname} - notify_moderation is disabled")
            return False

        message = (
            f"✅ <b>Твой челлендж одобрен!</b>\n\n"
            f"Марафон: {marathon_title}\n"
            f"Игра: {game_title}\n"
            f"Задание: {challenge_title}\n\n"
            f"Теперь оно доступно для всех участников."
        )
        return await self.notify_user(db, user_id, message)

    async def notify_challenge_rejected(
        self,
        db: AsyncSession,
        user_id: int,
        marathon_title: str,
        game_title: str,
        challenge_title: str
    ) -> bool:
        """Notify user that their proposed challenge was rejected (respects notify_moderation setting)."""
        # Check user's notification settings
        result = await db.execute(select(User).where(User.id == user_id))
        user = result.scalar_one_or_none()
        if user and not user.notify_moderation:
            logger.info(f"[Moderation] Skipping user {user.nickname} - notify_moderation is disabled")
            return False

        message = (
            f"❌ <b>Твой челлендж отклонён</b>\n\n"
            f"Марафон: {marathon_title}\n"
            f"Игра: {game_title}\n"
            f"Задание: {challenge_title}\n\n"
            f"Ты можешь предложить другой челлендж."
        )
        return await self.notify_user(db, user_id, message)

    async def notify_admin_disputes_pending(
        self,
        db: AsyncSession,
        count: int
    ) -> bool:
        """Notify admin about disputes waiting for decision."""
        if not settings.TELEGRAM_ADMIN_ID:
            logger.warning("[Notify] No TELEGRAM_ADMIN_ID configured")
            return False

        admin_url = f"{settings.FRONTEND_URL}/admin/disputes"
        use_inline_button = admin_url.startswith("https://")

        if use_inline_button:
            message = (
                f"⚠️ <b>{count} оспаривани{'е' if count == 1 else 'й'} ожида{'ет' if count == 1 else 'ют'} решения</b>\n\n"
                f"Голосование завершено, требуется ваше решение."
            )
            reply_markup = {
                "inline_keyboard": [[
                    {"text": "Открыть оспаривания", "url": admin_url}
                ]]
            }
        else:
            message = (
                f"⚠️ <b>{count} оспаривани{'е' if count == 1 else 'й'} ожида{'ет' if count == 1 else 'ют'} решения</b>\n\n"
                f"Голосование завершено, требуется ваше решение.\n\n"
                f"🔗 {admin_url}"
            )
            reply_markup = None

        return await self.send_message(
            int(settings.TELEGRAM_ADMIN_ID),
            message,
            reply_markup=reply_markup
        )


# Global instance
telegram_notifier = TelegramNotifier()