from typing import Dict, Any, Optional
from datetime import datetime
import html
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 _escape_md(text: str) -> str:
        """Escape literal Markdown-special chars in dynamic text (e.g. usernames) for legacy Telegram Markdown"""
        if not text:
            return text
        for ch in ('_', '*', '`', '['):
            text = text.replace(ch, '\\' + ch)
        return text

    @staticmethod
    def _format_accuracy(accuracy: Optional[float]) -> str:
        """Format accuracy percentage, or '-' if not available (game not analyzed)"""
        if accuracy is None:
            return "-"
        return f"{accuracy:.0f}%"

    @staticmethod
    def _format_row_outcome_circle(row: dict) -> str:
        """
        Colored circle for the tracked user's outcome in this row:
        🟢 win, 🔴 loss, ⚪ draw (or unknown side).
        """
        tracked_is_white = row.get('tracked_is_white')
        result = row.get('result', '')
        if tracked_is_white is None or result == "1/2-1/2":
            return "⚪"
        tracked_won = (result == "1-0" and tracked_is_white) or (result == "0-1" and not tracked_is_white)
        return "🟢" if tracked_won else "🔴"

    @staticmethod
    def _format_game_rows_block(rows: list) -> str:
        """
        Format a list of individual game rows as a column-aligned, monospace table:
        outcome | accuracy(tracked) | name(tracked)+color | rating(tracked) | vs | rating(opponent) | accuracy(opponent)

        Only the tracked player is named — the opponent is shown by rating/accuracy
        only, keeping the line short enough for mobile screens. A small circle right
        after the tracked player's name shows which color they played (⚪ white / ⚫ black).

        Column widths are computed from the actual data so every column lines up
        character-for-character. Caller is expected to wrap the result in a
        Markdown ``` code block ``` so Telegram renders it with a monospace font.
        """
        if not rows:
            return ""

        NAME_WIDTH = 7

        prepared = []
        for row in rows:
            circle = StatsFormatter._format_row_outcome_circle(row)
            tracked_is_white = row.get('tracked_is_white') is not False
            color_marker = "⚪" if tracked_is_white else "⚫"
            if tracked_is_white:
                tracked_name = row.get('white_name') or '?'
                tracked_rating = row.get('white_rating')
                tracked_accuracy = row.get('white_accuracy')
                opp_rating = row.get('black_rating')
                opp_accuracy = row.get('black_accuracy')
            else:
                tracked_name = row.get('black_name') or '?'
                tracked_rating = row.get('black_rating')
                tracked_accuracy = row.get('black_accuracy')
                opp_rating = row.get('white_rating')
                opp_accuracy = row.get('white_accuracy')
            name_field = f"{tracked_name[:NAME_WIDTH]}{color_marker}"
            tr_str = str(tracked_rating) if tracked_rating is not None else "-"
            or_str = str(opp_rating) if opp_rating is not None else "-"
            ta = StatsFormatter._format_accuracy(tracked_accuracy)
            oa = StatsFormatter._format_accuracy(opp_accuracy)
            prepared.append((circle, ta, name_field, tr_str, or_str, oa))

        acc_width = max(max(len(p[1]), len(p[5])) for p in prepared)
        name_width = NAME_WIDTH + 1  # +1 for the color marker glued to the name
        rating_width = max(max(len(p[3]), len(p[4])) for p in prepared)

        lines = []
        for circle, ta, name_field, tr_str, or_str, oa in prepared:
            lines.append(
                f"{circle} {ta:>{acc_width}} {name_field:<{name_width}} {tr_str:>{rating_width}} "
                f"- {or_str:>{rating_width}} {oa:>{acc_width}}"
            )
        return "\n".join(lines)

    @staticmethod
    def _format_mode_stats_block(rating, wins, losses, draws, lang: str) -> str:
        """
        Column-aligned monospace block for one game type's rating/wins/losses/draws,
        shown under the header line. Caller is expected to wrap the result in a
        Markdown ``` code block ``` for guaranteed monospace rendering.

        No accuracy row here: an average accuracy across several games isn't a
        meaningful stat (unlike the per-game accuracy shown in the game-rows table).

        Every label carries exactly one emoji prefix — Telegram's monospace font
        renders emoji wider than plain text of the same length() count, so a label
        with no emoji (unlike the other three) would visibly end up one column off
        despite matching character counts.
        """
        rows = [
            (t('stat_label_rating', lang), str(rating)),
            (t('stat_label_wins', lang), str(wins)),
            (t('stat_label_losses', lang), str(losses)),
            (t('stat_label_draws', lang), str(draws)),
        ]

        label_width = max(len(label) for label, _ in rows)
        value_width = max(len(value) for _, value in rows)
        return "\n".join(f"{label:<{label_width}} {value:>{value_width}}" for label, value in rows)

    @staticmethod
    def format_gamers_table(gamers_data: list) -> str:
        """
        Column-aligned monospace table for /getgamers: username, then bullet/blitz/rapid
        ratings, then the periodic-notification period suffix (e.g. "· 60m").

        Column widths are computed from the actual data so every column lines up
        character-for-character. Caller is expected to wrap the result in an HTML
        <pre> block so Telegram renders it with a monospace font (username can't be
        bolded there — pre/code entities can't contain other entities).
        """
        if not gamers_data:
            return ""

        rows = []
        for g in gamers_data:
            username = html.escape(str(g['username']))
            bullet = str(g['bullet'])
            blitz = str(g['blitz'])
            rapid = str(g['rapid'])
            period = (g.get('period') or '').strip()
            rows.append((username, bullet, blitz, rapid, period))

        name_width = max(len(r[0]) for r in rows)
        bullet_width = max(len(r[1]) for r in rows)
        blitz_width = max(len(r[2]) for r in rows)
        rapid_width = max(len(r[3]) for r in rows)

        lines = []
        for username, bullet, blitz, rapid, period in rows:
            line = (
                f"{username:<{name_width}}  "
                f"⚡{bullet:>{bullet_width}} 🔥{blitz:>{blitz_width}} 🐇{rapid:>{rapid_width}}"
            )
            if period:
                line += f" {period}"
            lines.append(line)
        return "\n".join(lines)

    @staticmethod
    def format_stats_response(data: Dict[str, Any], username: str, period: str, lang: str = 'en', accuracy_extra: Optional[Dict[str, Any]] = None) -> 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)
            # Filter out old "No active player" messages - this functionality is deprecated
            if 'No active player' in message or 'Нет активного игрока' in message or 'active player' in message.lower() or 'активного игрока' in message.lower():
                return 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)
        
        # Supplementary per-mode accuracy (+ per-game rows for today/yesterday), from a parallel
        # games-of-period fetch. Purely additive: absent/None just means no accuracy shown.
        accuracy_by_mode = (accuracy_extra.get('data') or {}) if accuracy_extra else {}

        # 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('game_type_header', lang,
                    emoji=emoji,
                    game_type=game_type_name,
                    games_count=games_count,
                    rating_change=rating_change_str
                )

                games_text += StatsFormatter._format_mode_stats_block(
                    rating, wins, losses, draws, lang
                ) + "\n\n"

        # Per-game row breakdown (today/yesterday only — week/lastYear stay aggregate-only)
        rows_text = ""
        if period in ("today", "yesterday"):
            for mode in ("blitz", "rapid", "classical"):
                rows = (accuracy_by_mode.get(mode) or {}).get('games') or []
                if not rows:
                    continue
                emoji = StatsFormatter._get_game_type_emoji(mode)
                rows_text += t('game_rows_heading', lang, emoji=emoji, game_type=mode.title())
                rows_text += StatsFormatter._format_game_rows_block(rows) + "\n\n"

        # Whole body goes into a single monospace code block so the message doesn't
        # alternate between plain-text headers and separately-fenced tables.
        body = t('stats_title', lang, username=username, date_range=date_range)
        body += task_text
        body += games_text.rstrip()
        if rows_text:
            body += "\n\n" + rows_text.rstrip()

        return "```\n" + body + "\n```"
    
    @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)
        has_puzzles_data = False
        if puzzles_data:
            # Check puzzles_in_period on top level first (priority)
            top_level_puzzles = puzzles_data.get('puzzles_in_period', 0)
            # Also check data.total_attempts
            if 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)
                
                effective_puzzles = top_level_puzzles if top_level_puzzles > 0 else total_puzzles
                
                # Only show tasks section if there's actual activity (not all zeros)
                if effective_puzzles > 0 or solved > 0 or failed > 0:
                    has_puzzles_data = True
                    result += t('period_puzzles_section', lang, total=effective_puzzles, solved=solved, failed=failed)
        
        # Format games
        has_games_data = False
        if games_data and games_data.get('data'):
            games_info = games_data['data']
            # Check games_count on top level first (priority)
            top_level_games_count = games_data.get('games_count', 0)
            # Also check data.total.games_played
            total_games = games_info.get('total', {}).get('games_played', 0)
            
            # Use top-level games_count if available, otherwise use total.games_played
            effective_games_count = top_level_games_count if top_level_games_count > 0 else total_games
            
            # Show details for each game type if there were games
            rows_text = ""
            if effective_games_count > 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:
                        has_games_data = True  # Only set to True if we actually add game data
                        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', 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()

                        # Точность в шапку не выводим — она всегда дублируется построчным
                        # разбором партий ниже (периодическая проверка — короткий период).
                        result += t('game_type_header', lang,
                            emoji=emoji,
                            game_type=game_type_name,
                            games_count=games_count,
                            rating_change=rating_change_str
                        )
                        result += StatsFormatter._format_mode_stats_block(rating, wins, losses, draws, lang) + "\n\n"

                        if game_type in ('blitz', 'rapid', 'classical'):
                            rows = game_data.get('games') or []
                            if rows:
                                rows_text += t('game_rows_heading', lang, emoji=emoji, game_type=game_type_name)
                                rows_text += StatsFormatter._format_game_rows_block(rows) + "\n\n"
            if rows_text:
                result += rows_text

        # If no activity at all
        if not has_games_data and not has_puzzles_data:
            result += t('no_activity', lang)

        # Whole body goes into a single monospace code block so the message doesn't
        # alternate between plain-text headers and separately-fenced tables.
        return "```\n" + result.rstrip() + "\n```"

    @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"\n\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"\n\nPeriod: {start_str}–{end_str}"

        # Collect per-mode rows
        rows = []
        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
            # Strip the variation selector some emoji include (e.g. bullet/classical) —
            # it's invisible but counts as an extra character, which would throw off
            # the column padding below even though it doesn't add any visual width.
            emoji = StatsFormatter._get_game_type_emoji(mode).replace('️', '')
            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 = mode_stats.get('rating')
            accuracy_str = "-"
            if mode in ("blitz", "rapid", "classical"):
                accuracy_str = StatsFormatter._format_accuracy(mode_stats.get('accuracy'))
            rows.append((
                f"{emoji} {mode.title()}",
                str(games_played),
                StatsFormatter._format_rating_change(rating_change),
                str(rating) if rating is not None else "—",
                str(wins),
                str(losses),
                str(draws),
                accuracy_str,
            ))

        if not rows:
            return f"{header}\n\n📭 No data"

        label_w = max(len(r[0]) for r in rows)
        games_w = max(len(r[1]) for r in rows)
        change_w = max(len(r[2]) for r in rows)
        rating_w = max(len(r[3]) for r in rows)
        wins_w = max(len(r[4]) for r in rows)
        losses_w = max(len(r[5]) for r in rows)
        draws_w = max(len(r[6]) for r in rows)
        acc_w = max((len(r[7]) for r in rows), default=0)

        lines = []
        for label, games, change, rating, wins, losses, draws, acc in rows:
            line = (
                f"{label:<{label_w}} {games:>{games_w}}  {change:<{change_w}}  "
                f"R{rating:>{rating_w}}  ✅{wins:>{wins_w}} ❌{losses:>{losses_w}} 🤝{draws:>{draws_w}}"
            )
            if acc_w:
                line += f"  🎯{acc:>{acc_w}}"
            lines.append(line)

        body = "\n".join(lines)
        return f"{header}\n\n```\n{body}\n```"