from typing import Dict, Any, Optional
from datetime import datetime
from i18n import t

class StatsFormatter:
    @staticmethod
    def _format_rating_change(rating_change: int) -> str:
        """Format rating change with colored circles"""
        if rating_change > 0:
            return f"🟢 +{rating_change}"
        elif rating_change < 0:
            return f"🔴 {rating_change}"
        else:
            return "⚪ 0"
    
    @staticmethod
    def format_stats_response(data: Dict[str, Any], username: str, period: str, lang: str = 'en') -> str:
        """Format statistics response according to the template"""
        if not data or data.get('data') is None:
            message = data.get('message', t('no_data', lang)) if data else t('no_data', lang)
            return f"📭 {message}"
        
        # Extract data from API response
        api_data = data.get('data', {})
        tasks = api_data.get('tasks', {})
        games = api_data.get('games', {})
        
        # Format date range
        date_range = StatsFormatter._get_date_range(period, lang)
        
        # Format tasks section
        task_text = ""
        if tasks and tasks.get('total', 0) > 0:
            total_tasks = tasks.get('total', 0)
            solved = tasks.get('solved', 0)
            unsolved = tasks.get('unsolved', 0)
            task_text = t('puzzles_section', lang, total=total_tasks, solved=solved, unsolved=unsolved)
        
        # Format games section
        games_text = ""
        if games:
            for game_type, game_data in games.items():
                if not game_data or game_data.get('games_played', 0) == 0:
                    continue
                    
                # Get game type emoji
                emoji = StatsFormatter._get_game_type_emoji(game_type)
                
                games_count = game_data.get('games_played', 0)
                rating_change = game_data.get('rating_change', 0)
                rating = game_data.get('final_rating', 0)
                wins = game_data.get('wins', 0)
                losses = game_data.get('losses', 0)
                draws = game_data.get('draws', 0)
                
                # Format rating change
                rating_change_str = StatsFormatter._format_rating_change(rating_change)
                
                # Get game type name (capitalize first letter)
                game_type_name = game_type.title()
                
                games_text += t('games_section', lang,
                    emoji=emoji,
                    game_type=game_type_name,
                    games_count=games_count,
                    rating_change=rating_change_str,
                    rating=rating,
                    wins=wins,
                    losses=losses,
                    draws=draws
                )
        
        # Combine all parts
        result = t('stats_title', lang, username=username, date_range=date_range)
        result += task_text
        result += games_text.rstrip()
        
        return result
    
    @staticmethod
    def _get_date_range(period: str, lang: str = 'en') -> str:
        """Get date range string for the period"""
        from datetime import datetime, timedelta
        
        today = datetime.now()
        
        if period == "today":
            return today.strftime("%d.%m.%Y")
        elif period == "yesterday":
            yesterday = today - timedelta(days=1)
            return yesterday.strftime("%d.%m.%Y")
        elif period == "week":
            week_ago = today - timedelta(days=7)
            return f"{week_ago.strftime('%d.%m.%Y')}–{today.strftime('%d.%m.%Y')}"
        else:
            return today.strftime("%d.%m.%Y")
    
    @staticmethod
    def _get_game_type_emoji(game_type: str) -> str:
        """Get emoji for game type"""
        emoji_map = {
            'bullet': '⚡️',
            'blitz': '🔥',
            'rapid': '🐇',
            'classical': '♟️',
            'correspondence': '📮'
        }
        return emoji_map.get(game_type.lower(), '🎯')
    
    @staticmethod
    def format_period_notification(username: str, games_data: Optional[Dict], puzzles_data: Optional[Dict], period_minutes: int, lang: str = 'en') -> str:
        """Format notification for periodic checks"""
        from datetime import datetime
        
        # Format period text
        if period_minutes == 1:
            period_text = t('period_1_minute', lang)
        elif period_minutes in [2, 3, 4]:
            period_text = t('period_2_3_4_minutes', lang, period=period_minutes)
        else:
            period_text = t('period_minutes_text', lang, period=period_minutes)
        
        result = t('period_notification_title', lang, username=username, period_text=period_text)
        
        # Format puzzles first (if available and there's actual activity)
        if puzzles_data and puzzles_data.get('data'):
            puzzles_info = puzzles_data['data']
            total_puzzles = puzzles_info.get('total_attempts', 0)
            solved = puzzles_info.get('solved', 0)
            failed = puzzles_info.get('failed', 0)
            
            # Only show tasks section if there's actual activity (not all zeros)
            if total_puzzles > 0 or solved > 0 or failed > 0:
                result += t('period_puzzles_section', lang, total=total_puzzles, solved=solved, failed=failed)
        
        # Format games
        if games_data and games_data.get('data'):
            games_info = games_data['data']
            total_games = games_info.get('total', {}).get('games_played', 0)
            
            # Show details for each game type if there were games
            if total_games > 0:
                for game_type, game_data in games_info.items():
                    if game_type != 'total' and game_data and game_data.get('games_played', 0) > 0:
                        emoji = StatsFormatter._get_game_type_emoji(game_type)
                        games_count = game_data.get('games_played', 0)
                        rating_change = game_data.get('rating_change', 0)
                        rating = game_data.get('rating', 0)
                        wins = game_data.get('wins', 0)
                        losses = game_data.get('losses', 0)
                        draws = game_data.get('draws', 0)
                        
                        rating_change_str = StatsFormatter._format_rating_change(rating_change)
                        game_type_name = game_type.title()
                        
                        result += t('period_games_section', lang,
                            emoji=emoji,
                            game_type=game_type_name,
                            games_count=games_count,
                            rating_change=rating_change_str,
                            rating=rating,
                            wins=wins,
                            losses=losses,
                            draws=draws
                        )
        
        # If no activity
        if not (games_data and games_data.get('data')) and not (puzzles_data and puzzles_data.get('data')):
            result += t('no_activity', lang)
        
        return result.rstrip()

    @staticmethod
    def format_last_year_or_1000(data: Dict[str, Any], username: str, lang: str = 'en') -> str:
        """
        Format response for last year or last 1000 games.
        Expects GamesOfPeriodResponse-like payload.
        """
        if not data:
            return "📭 No data"
        games_count = data.get('games_count', 0)
        period_start = data.get('period_start')
        period_end = data.get('period_end')
        stats = (data.get('data') or {})
        # Title and subheader
        if games_count >= 1000:
            header = f"📈 {username}: last 1000 rated games"
            earliest_ts = data.get('earliest_game_ts')
            if isinstance(earliest_ts, int):
                earliest = datetime.fromtimestamp(earliest_ts).strftime("%d.%m.%Y")
                header += f"\nStart of these 1000 games: {earliest}"
        else:
            header = f"📈 {username}: last year (rated), games: {games_count}"
            # Use earliest actual game date instead of naive 'year ago'
            earliest_ts = data.get('earliest_game_ts', period_start)
            if isinstance(earliest_ts, int) and isinstance(period_end, int):
                start_str = datetime.fromtimestamp(earliest_ts).strftime("%d.%m.%Y")
                end_str = datetime.fromtimestamp(period_end).strftime("%d.%m.%Y")
                header += f"\nPeriod: {start_str}–{end_str}"
        # Body per mode
        lines = []
        for mode in ["bullet", "blitz", "rapid", "classical", "correspondence"]:
            mode_stats = stats.get(mode)
            if not mode_stats:
                continue
            games_played = mode_stats.get('games_played', 0)
            if games_played == 0:
                continue
            emoji = StatsFormatter._get_game_type_emoji(mode)
            wins = mode_stats.get('wins', 0)
            losses = mode_stats.get('losses', 0)
            draws = mode_stats.get('draws', 0)
            rating_change = mode_stats.get('rating_change', 0)
            rating_change_str = StatsFormatter._format_rating_change(rating_change)
            rating = mode_stats.get('rating')
            rating_str = rating if rating is not None else "—"
            lines.append(
                f"{emoji} {mode.title()}: {games_played}  Δ {rating_change_str}  R {rating_str}  ✅ {wins}  ❌ {losses}  🤝 {draws}"
            )
        # Total
        # Do not print 'Итого' line per new requirement
        body = "\n".join(lines)
        return f"{header}\n{body}".rstrip()