import os
import logging
from typing import Optional, List
from telethon import TelegramClient, events, Button
from db.models import Post, TargetChannel
from db.repository import Repository
from bot.keyboards import get_review_keyboard
from core.metrics import ADMIN_ACTIONS_TOTAL
from core.proxy import get_telegram_proxy

logger = logging.getLogger(__name__)

SESSION_DIR = os.getenv("SESSION_DIR", "/app/sessions" if os.path.exists("/app") else "/projects/telegram-bots/copykar/sessions")

class AdminBotService:
    def __init__(
        self,
        repo: Repository,
        bot_token: Optional[str] = None,
        api_id: Optional[int] = None,
        api_hash: Optional[str] = None,
        review_channel_id: Optional[int] = None,
        admin_user_ids: Optional[List[int]] = None,
        session_name: Optional[str] = None,
    ):
        self.repo = repo
        self.bot_token = bot_token or os.getenv("BOT_TOKEN", "")
        self.api_id = api_id or int(os.getenv("API_ID", "0"))
        self.api_hash = api_hash or os.getenv("API_HASH", "")
        self.review_channel_id = review_channel_id or int(os.getenv("REVIEW_CHANNEL_ID", "0"))
        raw_admins = os.getenv("ADMIN_USER_IDS", "")
        self.admin_user_ids = admin_user_ids or [int(x.strip()) for x in raw_admins.split(",") if x.strip()]
        self.session_name = session_name or os.path.join(SESSION_DIR, "admin_bot.session")
        os.makedirs(os.path.dirname(self.session_name), exist_ok=True)
        self.client = TelegramClient(self.session_name, self.api_id, self.api_hash, proxy=get_telegram_proxy())

    def is_admin(self, user_id: int) -> bool:
        return not self.admin_user_ids or user_id in self.admin_user_ids

    async def start(self):
        logger.info("Starting Admin Review Bot...")
        await self.client.start(bot_token=self.bot_token)
        logger.info("Admin Review Bot connected successfully.")
        self._register_handlers()

    def _register_handlers(self):
        @self.client.on(events.CallbackQuery)
        async def on_callback(event: events.CallbackQuery.Event):
            if not self.is_admin(event.sender_id):
                await event.answer("⛔ You are not authorized.", alert=True)
                return

            data = event.data.decode("utf-8")
            if data.startswith("appr:"):
                _, post_id_str, target_id_str = data.split(":")
                post_id = int(post_id_str)
                target_id = int(target_id_str)

                target = await self.repo.get_target_by_id(target_id)
                target_title = target.title if target else f"Target #{target_id}"

                await self.repo.approve_post(post_id, target_id)
                ADMIN_ACTIONS_TOTAL.labels(action="approved").inc()

                await event.edit(
                    f"{event.text}\n\n✅ <b>Approved for {target_title}</b> by admin.",
                    parse_mode="html",
                    buttons=None
                )
                await event.answer(f"Approved for {target_title}!")

            elif data.startswith("rej:"):
                _, post_id_str = data.split(":")
                post_id = int(post_id_str)

                await self.repo.reject_post(post_id)
                ADMIN_ACTIONS_TOTAL.labels(action="rejected").inc()

                await event.edit(
                    f"{event.text}\n\n❌ <b>Rejected</b> by admin.",
                    parse_mode="html",
                    buttons=None
                )
                await event.answer("Post rejected.")

        # --- Admin Commands ---
        @self.client.on(events.NewMessage(pattern="/sources"))
        async def cmd_sources(event: events.NewMessage.Event):
            if not self.is_admin(event.sender_id):
                return
            sources = await self.repo.get_active_sources()
            if not sources:
                await event.reply("No active source channels configured. Use /add_source <channel_id> <title> [username]")
                return
            lines = ["<b>Active Monitored Sources:</b>"]
            for s in sources:
                lines.append(f"• ID: <code>{s.channel_id}</code> | Title: <b>{s.title or 'N/A'}</b> (@{s.username or 'none'})")
            await event.reply("\n".join(lines), parse_mode="html")

        @self.client.on(events.NewMessage(pattern=r"/add_source\s+(-?\d+)\s+([^\s]+)(?:\s+([^\s]+))?"))
        async def cmd_add_source(event: events.NewMessage.Event):
            if not self.is_admin(event.sender_id):
                return
            ch_id = int(event.pattern_match.group(1))
            title = event.pattern_match.group(2)
            username = event.pattern_match.group(3)
            await self.repo.add_source(channel_id=ch_id, title=title, username=username)
            await event.reply(f"✅ Added source channel <b>{title}</b> (<code>{ch_id}</code>).", parse_mode="html")

        @self.client.on(events.NewMessage(pattern="/targets"))
        async def cmd_targets(event: events.NewMessage.Event):
            if not self.is_admin(event.sender_id):
                return
            targets = await self.repo.get_active_targets()
            if not targets:
                await event.reply("No target channels configured. Use /add_target <channel_id> <title> <interval_min> [username]")
                return
            lines = ["<b>Target Publishing Channels:</b>"]
            for t in targets:
                lines.append(f"• ID: <code>{t.id}</code> (Channel: <code>{t.channel_id}</code>) | <b>{t.title}</b> | Interval: <b>{t.post_interval_min}m</b>")
            await event.reply("\n".join(lines), parse_mode="html")

        @self.client.on(events.NewMessage(pattern=r"/add_target\s+(-?\d+)\s+([^\s]+)\s+(\d+)(?:\s+([^\s]+))?"))
        async def cmd_add_target(event: events.NewMessage.Event):
            if not self.is_admin(event.sender_id):
                return
            ch_id = int(event.pattern_match.group(1))
            title = event.pattern_match.group(2)
            interval_min = int(event.pattern_match.group(3))
            username = event.pattern_match.group(4)
            await self.repo.add_target(channel_id=ch_id, title=title, username=username, post_interval_min=interval_min)
            await event.reply(f"✅ Added target channel <b>{title}</b> with interval <b>{interval_min}m</b>.", parse_mode="html")

        @self.client.on(events.NewMessage(pattern=r"/set_interval\s+(\d+)\s+(\d+)"))
        async def cmd_set_interval(event: events.NewMessage.Event):
            if not self.is_admin(event.sender_id):
                return
            target_id = int(event.pattern_match.group(1))
            new_interval = int(event.pattern_match.group(2))
            target = await self.repo.get_target_by_id(target_id)
            if not target:
                await event.reply("Target channel not found.")
                return
            await self.repo.add_target(
                channel_id=target.channel_id,
                title=target.title,
                username=target.username,
                post_interval_min=new_interval
            )
            await event.reply(f"✅ Updated interval for <b>{target.title}</b> to <b>{new_interval} minutes</b>.", parse_mode="html")

        @self.client.on(events.NewMessage(pattern="/stats"))
        async def cmd_stats(event: events.NewMessage.Event):
            if not self.is_admin(event.sender_id):
                return
            pending_ai = len(await self.repo.get_posts_by_status("pending_ai", limit=1000))
            pending_review = len(await self.repo.get_posts_by_status("pending_review", limit=1000))
            approved = len(await self.repo.get_posts_by_status("approved", limit=1000))
            published = len(await self.repo.get_posts_by_status("published", limit=1000))

            text = (
                "📊 <b>Copykar Bot Statistics</b>\n\n"
                f"• ⏳ Pending AI: <b>{pending_ai}</b>\n"
                f"• 📋 Pending Admin Review: <b>{pending_review}</b>\n"
                f"• 🚀 Approved (Queued): <b>{approved}</b>\n"
                f"• ✅ Published: <b>{published}</b>\n"
            )
            await event.reply(text, parse_mode="html")

    async def send_review_post(self, post_id: int):
        post = await self.repo.get_post_by_id(post_id)
        if not post or not self.review_channel_id:
            return

        targets = await self.repo.get_active_targets()
        keyboard = get_review_keyboard(post.id, targets)

        tags_str = ", ".join(post.tags) if post.tags else "None"
        dup_warning = ""
        if post.is_duplicate:
            dup_warning = (
                f"⚠️ <b>[DUPLICATE DETECTED]</b>\n"
                f"<b>Reason:</b> {post.similarity_reason or 'Similar story already published'}\n"
                f"<b>Matched Post ID:</b> #{post.duplicate_of_id}\n\n"
            )

        caption = (
            f"📌 <b>Subject:</b> {post.subject or 'N/A'}\n"
            f"🏷 <b>Tags:</b> <code>{tags_str}</code>\n\n"
            f"{dup_warning}"
            f"📝 <b>Generated Post Draft:</b>\n"
            f"{post.ai_text or post.raw_text}\n\n"
            f"<i>Source: Channel <code>{post.source_channel_id}</code> | Msg #{post.source_message_id}</i>"
        )

        try:
            if post.media_path and os.path.exists(post.media_path):
                msg = await self.client.send_file(
                    self.review_channel_id,
                    file=post.media_path,
                    caption=caption,
                    parse_mode="html",
                    buttons=keyboard
                )
            else:
                msg = await self.client.send_message(
                    self.review_channel_id,
                    caption,
                    parse_mode="html",
                    buttons=keyboard
                )

            await self.repo.update_review_message_id(post.id, msg.id)
        except Exception as e:
            logger.error(f"Failed to send review post {post.id} to review channel: {e}", exc_info=True)

    async def stop(self):
        if self.client.is_connected():
            await self.client.disconnect()
            logger.info("Admin Review Bot disconnected.")