import asyncio
from pyrogram import Client, filters
import pyromod
from pyrogram.types import Message, InlineKeyboardMarkup, InlineKeyboardButton
import config
from utils.logger import Logger
from pathlib import Path

from utils.mongo_indexer import (
    index_channel_messages,
    index_channel_messages_with_iter,
    MongoNotConfiguredError,
)
from utils.clients import get_client

logger = Logger(__name__)

START_CMD = """🚀 **Welcome To TG Drive's Bot Mode**

You can use this bot to upload files to your TG Drive website directly instead of doing it from website.

🗄 **Commands:**
/set_folder - Set folder for file uploads
/current_folder - Check current folder

📤 **How To Upload Files:** Send a file to this bot and it will be uploaded to your TG Drive website. You can also set a folder for file uploads using /set_folder command.

Read more about [TG Drive's Bot Mode](https://github.com/TechShreyash/TGDrive#tg-drives-bot-mode)
"""

SET_FOLDER_PATH_CACHE = {}  # Cache to store folder path for each folder id
DRIVE_DATA = None
BOT_MODE = None

session_cache_path = Path(f"./cache")
session_cache_path.parent.mkdir(parents=True, exist_ok=True)

main_bot = Client(
    name="main_bot",
    api_id=config.API_ID,
    api_hash=config.API_HASH,
    bot_token=config.MAIN_BOT_TOKEN,
    sleep_threshold=config.SLEEP_THRESHOLD,
    workdir=session_cache_path,
)


@main_bot.on_message(
    filters.command(["start", "help"])
    & filters.private
    & filters.user(config.TELEGRAM_ADMIN_IDS),
)
async def start_handler(client: Client, message: Message):
    await message.reply_text(START_CMD)


# Lock to prevent concurrent indexing
_index_lock = asyncio.Lock()

@main_bot.on_message(
    filters.command("index")
    & filters.private
    & filters.user(config.TELEGRAM_ADMIN_IDS),
)
async def index_handler(client: Client, message: Message):
    """
    /index - Index channel messages to MongoDB
    
    Note: Requires STRING_SESSIONS (user accounts) - bots cannot index channels.
    
    Usage:
    - /index <channel_id> - Index from channel ID directly
    - /index - Then forward a message or send message link
    """
    if _index_lock.locked():
        await message.reply_text("⏳ Wait until the previous indexing process completes.")
        return

    # Check if string sessions are available (required for indexing)
    from utils.clients import get_client
    try:
        indexing_client = get_client(premium_required=True)
    except RuntimeError:
        await message.reply_text(
            "❌ **Indexing requires STRING_SESSIONS (user accounts).**\n\n"
            "Bots cannot access full message history. Please configure `STRING_SESSIONS` "
            "in your environment variables to enable indexing."
        )
        return

    try:
        # Check if channel ID was provided as command argument
        if len(message.command) > 1:
            raw_chat_id = message.command[1].strip()
            try:
                chat_id = int(raw_chat_id)
            except ValueError:
                chat_id = raw_chat_id

            # Verify it's a channel and get info (use string session client)
            try:
                chat = await indexing_client.get_chat(chat_id)
                # Check if it's a channel - handle both enum and string formats
                chat_type = getattr(chat, 'type', None)
                type_str = str(chat_type).lower()
                # Check for channel in various formats: "channel", "chattype.channel", enum name, etc.
                if "channel" not in type_str and not getattr(chat, 'is_channel', False):
                    await message.reply_text(f"❌ I can only index channels. Got type: {chat_type}")
                    return

                # Ask user to optionally send a message (forward or link) to specify last message ID
                # Or they can just send a number for skip count to use auto-detection
                i = await message.reply_text(
                    "📤 **Option 1:** Forward the last message from the channel, or send the last message link.\n"
                    "📊 **Option 2:** Just send a number (skip count, default: 0) to auto-detect last message.\n\n"
                    "_(Send a number or forward/link within 60 seconds)_"
                )
                msg_input = await client.listen(chat_id=message.chat.id, user_id=message.from_user.id, timeout=60)
                await i.delete()

                last_msg_id = None
                skip = 0

                # Check if it's a message link
                if msg_input.text and msg_input.text.startswith("https://t.me"):
                    try:
                        msg_link = msg_input.text.split("/")
                        last_msg_id = int(msg_link[-1])
                        # Verify it's from the same channel
                        chat_id_from_link = msg_link[-2]
                        if chat_id_from_link.isnumeric():
                            chat_id_from_link = int("-100" + chat_id_from_link)
                        if chat_id_from_link != chat_id:
                            await message.reply_text("❌ Message link is from a different channel!")
                            return
                    except Exception:
                        await message.reply_text("❌ Invalid message link!")
                        return
                # Check if it's a forwarded message (using new forward_origin API)
                elif msg_input.forward_origin:
                    from pyrogram.types import MessageOriginChannel
                    if isinstance(msg_input.forward_origin, MessageOriginChannel):
                        forward_chat = msg_input.forward_origin.chat
                        forward_chat_id = forward_chat.username if forward_chat else None
                        if not forward_chat_id:
                            forward_chat_id = msg_input.forward_origin.chat.id if msg_input.forward_origin.chat else None
                        if forward_chat_id != chat_id:
                            await message.reply_text("❌ Forwarded message is from a different channel!")
                            return
                        last_msg_id = msg_input.forward_origin.message_id
                    else:
                        await message.reply_text("❌ Please forward a message from a channel.")
                        return
                # Check if it's just a number (skip count)
                elif msg_input.text and msg_input.text.strip().isdigit():
                    skip = int(msg_input.text.strip())
                    # Auto-detect last message ID using get_chat_history (works with user accounts)
                    last_msg_id = None
                    try:
                        # Get the most recent message to find last_msg_id
                        async for msg in indexing_client.get_chat_history(chat_id, limit=1):
                            last_msg_id = msg.id
                            logger.info(f"Found last message ID: {last_msg_id}")
                            break
                        if last_msg_id is None:
                            await message.reply_text("❌ Could not find any messages in the channel.")
                            return
                    except Exception as e:
                        logger.warning(f"Could not find last message ID: {e}")
                        await message.reply_text(
                            f"⚠️ Could not automatically find the last message ID.\n\n"
                            f"Error: {e}\n\n"
                            "Please send a message link or forward a message instead."
                        )
                        return
                else:
                    await message.reply_text("❌ Please send a number (skip count), message link, or forward a message.")
                    return

                # Confirm indexing
                from pyrogram.types import InlineKeyboardMarkup, InlineKeyboardButton
                buttons = [
                    [InlineKeyboardButton("✅ YES", callback_data=f"index#yes#{chat_id}#{last_msg_id}#{skip}")],
                    [InlineKeyboardButton("❌ CANCEL", callback_data="index#cancel")]
                ]
                reply_markup = InlineKeyboardMarkup(buttons)
                
                await message.reply_text(
                    f"📋 Do you want to index **{chat.title}** channel?\n\n"
                    f"Last Message ID: `{last_msg_id}`\n"
                    f"Skip Count: `{skip}`",
                    reply_markup=reply_markup
                )
                return

            except Exception as e:
                await message.reply_text(f"❌ Error accessing channel: {e}")
                return

        # No channel ID provided, ask for forward/link
        i = await message.reply_text("📤 Forward the last message from the channel, or send the last message link.")
        msg = await client.listen(chat_id=message.chat.id, user_id=message.from_user.id, timeout=60)
        await i.delete()

        chat_id = None
        last_msg_id = None

        # Check if it's a message link
        if msg.text and msg.text.startswith("https://t.me"):
            try:
                msg_link = msg.text.split("/")
                last_msg_id = int(msg_link[-1])
                chat_id_str = msg_link[-2]
                if chat_id_str.isnumeric():
                    chat_id = int("-100" + chat_id_str)
                else:
                    chat_id = chat_id_str
            except Exception:
                await message.reply_text("❌ Invalid message link!")
                return
        # Check if it's a forwarded message (using new forward_origin API)
        elif msg.forward_origin:
            from pyrogram.types import MessageOriginChannel
            if isinstance(msg.forward_origin, MessageOriginChannel):
                forward_chat = msg.forward_origin.chat
                chat_type = getattr(forward_chat, 'type', None) if forward_chat else None
                type_str = str(chat_type).lower() if chat_type else ""
                if "channel" not in type_str and not getattr(forward_chat, 'is_channel', False) if forward_chat else False:
                    await message.reply_text("❌ Please forward a message from a channel.")
                    return
                last_msg_id = msg.forward_origin.message_id
                chat_id = forward_chat.username if forward_chat and forward_chat.username else (forward_chat.id if forward_chat else None)
                if chat_id is None:
                    await message.reply_text("❌ Could not determine channel from forwarded message.")
                    return
            else:
                await message.reply_text("❌ Please forward a message from a channel.")
                return
        else:
            await message.reply_text("❌ Please forward a message from a channel or send a message link.")
            return

        # Verify it's a channel (use string session client)
        try:
            chat = await indexing_client.get_chat(chat_id)
            chat_type = getattr(chat, 'type', None)
            type_str = str(chat_type).lower()
            # Check for channel in various formats: "channel", "chattype.channel", enum name, etc.
            if "channel" not in type_str and not getattr(chat, 'is_channel', False):
                await message.reply_text(f"❌ I can only index channels. Got type: {chat_type}")
                return
        except Exception as e:
            await message.reply_text(f"❌ Error: {e}")
            return

        # Ask for skip count
        s = await message.reply_text("📊 Send the number of messages to skip from the start (default: 0)")
        skip_msg = await client.listen(chat_id=message.chat.id, user_id=message.from_user.id, timeout=60)
        await s.delete()
        
        try:
            skip = int(skip_msg.text) if skip_msg.text.strip() else 0
        except ValueError:
            await message.reply_text("❌ Invalid number. Using 0 as default.")
            skip = 0

        # Confirm indexing
        from pyrogram.types import InlineKeyboardMarkup, InlineKeyboardButton
        buttons = [
            [InlineKeyboardButton("✅ YES", callback_data=f"index#yes#{chat_id}#{last_msg_id}#{skip}")],
            [InlineKeyboardButton("❌ CANCEL", callback_data="index#cancel")]
        ]
        reply_markup = InlineKeyboardMarkup(buttons)
        
        await message.reply_text(
            f"📋 Do you want to index **{chat.title}** channel?\n\n"
            f"Total Messages: `{last_msg_id}`\n"
            f"Skip Count: `{skip}`",
            reply_markup=reply_markup
        )

    except asyncio.TimeoutError:
        await message.reply_text("⏱️ Timeout. Please try again.")
    except Exception as e:
        await message.reply_text(f"❌ Error: {e}")


@main_bot.on_callback_query(filters.regex(r"^index#"))
async def index_callback_handler(client: Client, callback_query):
    """Handle index confirmation callback"""
    data = callback_query.data.split("#")
    
    if len(data) < 2:
        await callback_query.answer("Invalid callback data")
        return

    ident = data[1]
    
    if ident == "cancel":
        global _index_cancel
        _index_cancel = True
        await callback_query.message.edit("🛑 Trying to cancel indexing...")
        await callback_query.answer("Cancellation requested")
        return
    
    if ident == "yes" and len(data) >= 5:
        chat_id = data[2]
        last_msg_id = int(data[3])
        skip = int(data[4])
        
        try:
            chat_id_int = int(chat_id)
        except ValueError:
            chat_id_int = chat_id
        
        await callback_query.message.edit("🔄 Starting indexing...")
        await callback_query.answer("Indexing started")
        
        # Get string session client for indexing
        try:
            indexing_client = get_client(premium_required=True)
        except RuntimeError:
            await callback_query.message.edit(
                "❌ **Indexing requires STRING_SESSIONS (user accounts).**\n\n"
                "Bots cannot access full message history. Please configure `STRING_SESSIONS` "
                "in your environment variables to enable indexing."
            )
            await callback_query.answer("STRING_SESSIONS required")
            return
        
        # Run indexing in background
        asyncio.create_task(
            index_channel_messages_with_iter(
                indexing_client, chat_id_int, last_msg_id, skip, callback_query.message
            )
        )
    else:
        await callback_query.answer("Invalid callback data")


@main_bot.on_message(
    filters.command("set_folder")
    & filters.private
    & filters.user(config.TELEGRAM_ADMIN_IDS),
)
async def set_folder_handler(client: Client, message: Message):
    global SET_FOLDER_PATH_CACHE, DRIVE_DATA

    while True:
        try:
            folder_name = await client.ask(
                message.chat.id,
                "Send the folder name where you want to upload files\n\n/cancel to cancel",
                timeout=60,
                filters=filters.text,
            )
        except asyncio.TimeoutError:
            await message.reply_text("Timeout\n\nUse /set_folder to set folder again")
            return

        if folder_name.text.lower() == "/cancel":
            await message.reply_text("Cancelled")
            return

        folder_name = folder_name.text.strip()
        search_result = DRIVE_DATA.search_file_folder(folder_name)

        # Get folders from search result
        folders = {}
        for item in search_result.values():
            if item.type == "folder":
                folders[item.id] = item

        if len(folders) == 0:
            await message.reply_text(f"No Folder found with name {folder_name}")
        else:
            break

    buttons = []
    folder_cache = {}
    folder_cache_id = len(SET_FOLDER_PATH_CACHE) + 1

    for folder in search_result.values():
        path = folder.path.strip("/")
        folder_path = "/" + ("/" + path + "/" + folder.id).strip("/")
        folder_cache[folder.id] = (folder_path, folder.name)
        buttons.append(
            [
                InlineKeyboardButton(
                    folder.name,
                    callback_data=f"set_folder_{folder_cache_id}_{folder.id}",
                )
            ]
        )
    SET_FOLDER_PATH_CACHE[folder_cache_id] = folder_cache

    await message.reply_text(
        "Select the folder where you want to upload files",
        reply_markup=InlineKeyboardMarkup(buttons),
    )


@main_bot.on_callback_query(
    filters.user(config.TELEGRAM_ADMIN_IDS) & filters.regex(r"set_folder_")
)
async def set_folder_callback(client: Client, callback_query: Message):
    global SET_FOLDER_PATH_CACHE, BOT_MODE

    folder_cache_id, folder_id = callback_query.data.split("_")[2:]

    folder_path_cache = SET_FOLDER_PATH_CACHE.get(int(folder_cache_id))
    if folder_path_cache is None:
        await callback_query.answer("Request Expired, Send /set_folder again")
        await callback_query.message.delete()
        return

    folder_path, name = folder_path_cache.get(folder_id)
    del SET_FOLDER_PATH_CACHE[int(folder_cache_id)]
    BOT_MODE.set_folder(folder_path, name)

    await callback_query.answer(f"Folder Set Successfully To : {name}")
    await callback_query.message.edit(
        f"Folder Set Successfully To : {name}\n\nNow you can send / forward files to me and it will be uploaded to this folder."
    )


@main_bot.on_message(
    filters.command("current_folder")
    & filters.private
    & filters.user(config.TELEGRAM_ADMIN_IDS),
)
async def current_folder_handler(client: Client, message: Message):
    global BOT_MODE

    await message.reply_text(f"Current Folder: {BOT_MODE.current_folder_name}")


# Handling when any file is sent to the bot
@main_bot.on_message(
    filters.private
    & filters.user(config.TELEGRAM_ADMIN_IDS)
    & (
        filters.document
        | filters.video
        | filters.audio
        | filters.photo
        | filters.sticker
    )
)
async def file_handler(client: Client, message: Message):
    global BOT_MODE, DRIVE_DATA

    copied_message = await message.copy(config.STORAGE_CHANNEL)
    file = (
        copied_message.document
        or copied_message.video
        or copied_message.audio
        or copied_message.photo
        or copied_message.sticker
    )

    DRIVE_DATA.new_file(
        BOT_MODE.current_folder,
        file.file_name,
        copied_message.id,
        file.file_size,
    )

    await message.reply_text(
        f"""✅ File Uploaded Successfully To Your TG Drive Website
                             
**File Name:** {file.file_name}
**Folder:** {BOT_MODE.current_folder_name}
"""
    )


async def start_bot_mode(d, b):
    global DRIVE_DATA, BOT_MODE
    DRIVE_DATA = d
    BOT_MODE = b

    logger.info("Starting Main Bot")
    try:
        await main_bot.start()
    except Exception as e:
        # If the main bot fails to start (e.g. network issues), log and continue without bot mode
        logger.error(f"Failed to start Main Bot (Bot Mode will be disabled): {e}")
        return

    try:
        await main_bot.send_message(
            config.STORAGE_CHANNEL, "Main Bot Started -> TG Drive's Bot Mode Enabled"
        )
        logger.info("Main Bot Started")
        logger.info("TG Drive's Bot Mode Enabled")
    except Exception as e:
        logger.error(f"Main Bot started but failed to send startup message: {e}")