"""
Main handlers for the Telegram bot.
This module contains the core message routing and utility functions.
All specific action handlers are organized in separate modules.
"""
import logging
import os
import json
from telegram import Update, InlineKeyboardMarkup, InputMediaPhoto
from telegram.ext import ContextTypes
from telegram.error import BadRequest
from . import database, keyboards
from .utils import admin_only
from data.world_loader import game_world

# Import organized action handlers
from .action_handlers import (
    get_player_status_text,
    handle_inspect_area,
    handle_attack_wandering,
    handle_inspect_interactable,
    handle_action,
    handle_main_menu,
    handle_move_menu,
    handle_move
)
from .inventory_handlers import (
    handle_inventory_menu,
    handle_inventory_item,
    handle_inventory_use,
    handle_inventory_drop,
    handle_inventory_equip,
    handle_inventory_unequip
)
from .pickup_handlers import (
    handle_pickup_menu,
    handle_pickup
)
from .combat_handlers import (
    handle_combat_attack,
    handle_combat_flee,
    handle_combat_use_item_menu,
    handle_combat_use_item,
    handle_combat_back
)
from .profile_handlers import (
    handle_profile,
    handle_spend_points_menu,
    handle_spend_point
)
from .corpse_handlers import (
    handle_loot_player_corpse,
    handle_take_corpse_item,
    handle_scavenge_npc_corpse,
    handle_scavenge_corpse_item
)

logger = logging.getLogger(__name__)


# ============================================================================
# UTILITY FUNCTIONS
# ============================================================================

async def send_or_edit_with_image(query, text: str, reply_markup: InlineKeyboardMarkup, 
                                   image_path: str = None, parse_mode='HTML'):
    """
    Send a message with an image (as caption) or edit existing message.
    Uses edit_message_media for smooth transitions when changing images.
    """
    current_message = query.message
    has_photo = bool(current_message.photo)
    
    if image_path:
        # Get or upload image
        cached_file_id = await database.get_cached_image(image_path)
        
        if not cached_file_id and os.path.exists(image_path):
            # Upload new image
            try:
                with open(image_path, 'rb') as img_file:
                    temp_msg = await current_message.reply_photo(
                        photo=img_file,
                        caption=text,
                        reply_markup=reply_markup,
                        parse_mode=parse_mode
                    )
                if temp_msg.photo:
                    cached_file_id = temp_msg.photo[-1].file_id
                    await database.cache_image(image_path, cached_file_id)
                # Delete old message to keep chat clean
                try:
                    await current_message.delete()
                except:
                    pass
                return
            except Exception as e:
                logger.error(f"Error uploading image: {e}")
                cached_file_id = None
        
        if cached_file_id:
            # Check if current message has same photo
            if has_photo:
                current_file_id = current_message.photo[-1].file_id
                if current_file_id == cached_file_id:
                    # Same image, just edit caption
                    try:
                        await query.edit_message_caption(
                            caption=text,
                            reply_markup=reply_markup,
                            parse_mode=parse_mode
                        )
                        return
                    except BadRequest as e:
                        if "Message is not modified" in str(e):
                            return
                else:
                    # Different image - use edit_message_media for smooth transition
                    try:
                        media = InputMediaPhoto(
                            media=cached_file_id,
                            caption=text,
                            parse_mode=parse_mode
                        )
                        await query.edit_message_media(
                            media=media,
                            reply_markup=reply_markup
                        )
                        return
                    except Exception as e:
                        logger.error(f"Error editing message media: {e}")
            
            # Current message has no photo - need to delete and send new
            if not has_photo:
                try:
                    await current_message.delete()
                except:
                    pass
            
            try:
                await current_message.reply_photo(
                    photo=cached_file_id,
                    caption=text,
                    reply_markup=reply_markup,
                    parse_mode=parse_mode
                )
            except Exception as e:
                logger.error(f"Error sending cached image: {e}")
    else:
        # No image requested
        if has_photo:
            # Current message has photo, need to delete and send text-only
            try:
                await current_message.delete()
            except:
                pass
            await current_message.reply_html(text=text, reply_markup=reply_markup)
        else:
            # Both text-only, just edit
            try:
                await query.edit_message_text(text=text, reply_markup=reply_markup, parse_mode=parse_mode)
            except BadRequest as e:
                if "Message is not modified" not in str(e):
                    await current_message.reply_html(text=text, reply_markup=reply_markup)


# ============================================================================
# COMMAND HANDLERS
# ============================================================================

async def start(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Handle /start command - initialize or show player status."""
    user = update.effective_user
    player = await database.get_player(user.id)
    
    if not player:
        await database.create_player(user.id, user.first_name)
        await update.message.reply_html(
            f"Welcome, {user.mention_html()}! Your story is just beginning."
        )
    
    # Get player status and location image
    player = await database.get_player(user.id)
    status_text = await get_player_status_text(user.id)
    location = game_world.get_location(player['location_id'])
    
    # Send with image if available
    if location and location.image_path:
        cached_file_id = await database.get_cached_image(location.image_path)
        if cached_file_id:
            await update.message.reply_photo(
                photo=cached_file_id,
                caption=status_text,
                reply_markup=keyboards.main_menu_keyboard(),
                parse_mode='HTML'
            )
        elif os.path.exists(location.image_path):
            with open(location.image_path, 'rb') as img_file:
                msg = await update.message.reply_photo(
                    photo=img_file,
                    caption=status_text,
                    reply_markup=keyboards.main_menu_keyboard(),
                    parse_mode='HTML'
                )
            if msg.photo:
                await database.cache_image(location.image_path, msg.photo[-1].file_id)
        else:
            await update.message.reply_html(
                status_text,
                reply_markup=keyboards.main_menu_keyboard()
            )
    else:
        await update.message.reply_html(
            status_text,
            reply_markup=keyboards.main_menu_keyboard()
        )


@admin_only
async def export_map(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Export map data as JSON for external visualization."""
    from data.world_loader import export_map_data
    from io import BytesIO
    
    map_data = export_map_data()
    json_str = json.dumps(map_data, indent=2)
    
    # Send as text file
    file = BytesIO(json_str.encode('utf-8'))
    file.name = "map_data.json"
    
    await update.message.reply_document(
        document=file,
        filename="map_data.json",
        caption="🗺️ Game Map Data\n\nThis JSON file contains all locations, coordinates, and connections.\nYou can use it to visualize the game map in external tools."
    )


@admin_only
async def spawn_stats(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Show wandering enemy spawn statistics (debug command)."""
    from bot.spawn_manager import get_spawn_stats
    
    stats = await get_spawn_stats()
    
    text = "📊 <b>Wandering Enemy Statistics</b>\n\n"
    text += f"<b>Total Active Enemies:</b> {stats['total_active']}\n\n"
    
    if stats['by_location']:
        text += "<b>Enemies by Location:</b>\n"
        for loc_id, count in stats['by_location'].items():
            location = game_world.get_location(loc_id)
            loc_name = location.name if location else loc_id
            text += f"• {loc_name}: {count}\n"
    else:
        text += "<i>No wandering enemies currently active.</i>"
    
    await update.message.reply_html(text)


# ============================================================================
# BUTTON CALLBACK ROUTER
# ============================================================================

# Create handler mapping
ACTION_HANDLERS = {
    "inspect_area": handle_inspect_area,
    "attack_wandering": handle_attack_wandering,
    "inspect": handle_inspect_interactable,
    "action": handle_action,
    "inspect_area_menu": handle_inspect_area,
    "main_menu": handle_main_menu,
    "move_menu": handle_move_menu,
    "move": handle_move,
    "profile": handle_profile,
    "spend_points_menu": handle_spend_points_menu,
    "spend_point": handle_spend_point,
    "inventory_menu": handle_inventory_menu,
    "inventory_item": handle_inventory_item,
    "inventory_use": handle_inventory_use,
    "inventory_drop": handle_inventory_drop,
    "inventory_equip": handle_inventory_equip,
    "inventory_unequip": handle_inventory_unequip,
    "pickup_menu": handle_pickup_menu,
    "pickup": handle_pickup,
    "combat_attack": handle_combat_attack,
    "combat_flee": handle_combat_flee,
    "combat_use_item_menu": handle_combat_use_item_menu,
    "combat_use_item": handle_combat_use_item,
    "combat_back": handle_combat_back,
    "loot_player_corpse": handle_loot_player_corpse,
    "take_corpse_item": handle_take_corpse_item,
    "scavenge_npc_corpse": handle_scavenge_npc_corpse,
    "scavenge_corpse_item": handle_scavenge_corpse_item,
    "no_op": lambda query, user_id, player, data: query.answer()
}

async def button_handler(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """
    Main router for button callbacks.
    Delegates to specific handler functions based on action type.
    """
    query = update.callback_query
    user_id = query.from_user.id
    data = query.data.split(':')
    action_type = data[0]

    player = await database.get_player(user_id)
    if not player or player['is_dead']:
        await query.answer()
        await send_or_edit_with_image(
            query,
            text="💀 Your journey has ended. You died in the wasteland. Create a new character with /start to begin again.",
            reply_markup=None
        )
        return
    
    # Check if player is in combat - restrict most actions
    combat = await database.get_combat(user_id)
    allowed_in_combat = [
        'combat_attack', 'combat_flee', 'combat_use_item_menu',
        'combat_use_item', 'combat_back', 'no_op'
    ]
    if combat and action_type not in allowed_in_combat:
        await query.answer("You're in combat! Focus on the fight!", show_alert=False)
        return

    # Route to appropriate handler based on action type
    try:
        handler = ACTION_HANDLERS.get(action_type)
        if handler:
            await handler(query, user_id, player, data)
        else:
            logger.warning(f"Unknown action type: {action_type}")
            await query.answer("Unknown action", show_alert=False)
    
    except Exception as e:
        logger.error(f"Error handling button action {action_type}: {e}", exc_info=True)
        await query.answer("An error occurred. Please try again.", show_alert=True)