# -*- coding: utf-8 -*-
"""
Utility functions and decorators for the bot.
"""
import os
import functools
import logging
from telegram import Update
from telegram.ext import ContextTypes

logger = logging.getLogger(__name__)


def create_progress_bar(current: int, maximum: int, length: int = 10, filled_char: str = "█", empty_char: str = "░") -> str:
    """
    Create a visual progress bar.
    
    Args:
        current: Current value
        maximum: Maximum value
        length: Length of the bar in characters (default 10)
        filled_char: Character for filled portion (default █)
        empty_char: Character for empty portion (default ░)
    
    Returns:
        String representation of progress bar
        
    Examples:
        >>> create_progress_bar(75, 100)
        "███████░░░"
        >>> create_progress_bar(0, 100)
        "░░░░░░░░░░"
        >>> create_progress_bar(100, 100)
        "██████████"
    """
    if maximum <= 0:
        return empty_char * length
    
    percentage = min(1.0, max(0.0, current / maximum))
    filled_length = int(length * percentage)
    empty_length = length - filled_length
    
    return filled_char * filled_length + empty_char * empty_length


def format_stat_bar(label: str, emoji: str, current: int, maximum: int, bar_length: int = 10) -> str:
    """
    Format a stat (HP, Stamina, etc.) with visual progress bar.
    
    Args:
        label: Stat label (e.g., "HP", "Stamina")
        emoji: Emoji to display (e.g., "❤️", "⚡")
        current: Current value
        maximum: Maximum value
        bar_length: Length of the progress bar
    
    Returns:
        Formatted string with bar and percentage
        
    Examples:
        >>> format_stat_bar("HP", "❤️", 75, 100)
        "❤️ HP: ███████░░░ 75% (75/100)"
        >>> format_stat_bar("Stamina", "⚡", 50, 100)
        "⚡ Stamina: █████░░░░░ 50% (50/100)"
    """
    bar = create_progress_bar(current, maximum, bar_length)
    percentage = int((current / maximum * 100)) if maximum > 0 else 0
    
    return f"{emoji} {label}: {bar} {percentage}% ({current}/{maximum})"


def get_admin_ids():
    """Get the list of admin user IDs from environment variable."""
    admin_ids_str = os.getenv("ADMIN_IDS", "")
    if not admin_ids_str:
        logger.warning("ADMIN_IDS not set in .env file. No admins configured.")
        return set()
    
    try:
        # Parse comma-separated list of IDs
        admin_ids = set(int(id.strip()) for id in admin_ids_str.split(",") if id.strip())
        return admin_ids
    except ValueError as e:
        logger.error(f"Error parsing ADMIN_IDS: {e}")
        return set()


def admin_only(func):
    """
    Decorator that restricts command to admin users only.
    
    Usage:
        @admin_only
        async def my_admin_command(update: Update, context: ContextTypes.DEFAULT_TYPE):
            ...
    """
    @functools.wraps(func)
    async def wrapper(update: Update, context: ContextTypes.DEFAULT_TYPE, *args, **kwargs):
        user_id = update.effective_user.id
        admin_ids = get_admin_ids()
        
        if user_id not in admin_ids:
            await update.message.reply_html(
                "🚫 <b>Access Denied</b>\n\n"
                "This command is restricted to administrators only."
            )
            logger.warning(f"User {user_id} attempted to use admin command: {func.__name__}")
            return
        
        # User is admin, execute the command
        return await func(update, context, *args, **kwargs)
    
    return wrapper


def is_admin(user_id: int) -> bool:
    """Check if a user ID is an admin."""
    admin_ids = get_admin_ids()
    return user_id in admin_ids