baseball_organisator/team_stats/views.py

from django.shortcuts import render, get_object_or_404
from django.contrib.auth.decorators import login_required
from django.http import HttpResponseForbidden
from clubs.models import Team
from calendars.models import Game, EventParticipation

def _calculate_statistics(team, season=None):
    """
    Calculates statistics for a given team and season.
    """
    games_query = Game.objects.filter(team=team, result__isnull=False).prefetch_related('opened_for_teams')
    if season:
        games_query = games_query.filter(season=season)
    
    games = games_query.order_by('start_time')

    wins = 0
    losses = 0
    runs_scored = 0
    runs_allowed = 0
    inning_runs = {i: 0 for i in range(1, 10)}
    streak_counter = 0
    last_game_result = None
    
    games_with_supporters = 0
    total_supporter_player_percentage = 0

    for game in games:
        # Supporter stats
        if game.opened_for_teams.exists():
            games_with_supporters += 1
            
            attending_players = EventParticipation.objects.filter(event=game, status='attending').select_related('user__team')
            total_attendees = attending_players.count()
            
            if total_attendees > 0:
                supporter_players_count = attending_players.exclude(user__team=game.team).count()
                supporter_percentage = (supporter_players_count / total_attendees) * 100
                total_supporter_player_percentage += supporter_percentage

        # Standard game stats
        result = game.result
        
        sorted_items = sorted(result.inning_results.items(), key=lambda x: int(x[0].split('_')[1]))
        home_innings = [
            item[1].get('home') 
            for item in sorted_items 
            if isinstance(item[1].get('home'), int)
        ]
        away_innings = [
            item[1].get('guest') 
            for item in sorted_items 
            if isinstance(item[1].get('guest'), int)
        ]
        home_score = sum(home_innings)
        away_score = sum(away_innings)

        if game.is_home_game:
            team_score = home_score
            opponent_score = away_score
        else:
            team_score = away_score
            opponent_score = home_score
            
        runs_scored += team_score
        runs_allowed += opponent_score

        if team_score > opponent_score:
            wins += 1
            if last_game_result == 'win':
                streak_counter += 1
            else:
                streak_counter = 1
            last_game_result = 'win'
        elif team_score < opponent_score:
            losses += 1
            if last_game_result == 'loss':
                streak_counter += 1
            else:
                streak_counter = 1
            last_game_result = 'loss'
            
        team_innings = home_innings if game.is_home_game else away_innings
        for i, runs in enumerate(team_innings):
            if i + 1 in inning_runs:
                inning_runs[i + 1] += runs

    total_games = wins + losses
    pct = (wins / total_games) * 100 if total_games > 0 else 0

    if last_game_result == 'win':
        streak_str = f"Won {streak_counter}"
    elif last_game_result == 'loss':
        streak_str = f"Lost {streak_counter}"
    else:
        streak_str = "N/A"
        
    if runs_scored > 0 or runs_allowed > 0:
        pythagorean_pct = (runs_scored**2 / (runs_scored**2 + runs_allowed**2)) * 100
    else:
        pythagorean_pct = 0
        
    avg_supporter_player_percentage = (total_supporter_player_percentage / games_with_supporters) if games_with_supporters > 0 else 0

    return {
        'team': team,
        'wins': wins,
        'losses': losses,
        'pct': pct,
        'streak': streak_str,
        'runs_scored': runs_scored,
        'runs_allowed': runs_allowed,
        'pythagorean_pct': pythagorean_pct,
        'inning_runs': inning_runs,
        'total_games': total_games,
        'games_with_supporters': games_with_supporters,
        'avg_supporter_player_percentage': avg_supporter_player_percentage,
    }

@login_required
def team_statistics(request, team_id):
    team = get_object_or_404(Team, pk=team_id)
    
    # User must be the head coach of the parent team to view the stats
    if request.user != team.head_coach:
        return HttpResponseForbidden("You are not authorized to view this page.")

    selected_season = request.GET.get('season')

    # Create a list of the parent team and all its child teams
    teams_to_display = [team] + list(team.child_teams.all())

    # Calculate statistics for each team
    teams_stats = []
    for t in teams_to_display:
        stats = _calculate_statistics(t, selected_season)
        teams_stats.append(stats)

    # Get all available seasons for the filter dropdown
    available_seasons = Game.objects.values_list('season', flat=True).distinct().order_by('season')

    context = {
        'team': team, # Primary team for page header/auth
        'teams_stats': teams_stats,
        'available_seasons': available_seasons,
        'selected_season': selected_season,
    }

    return render(request, 'team_stats/team_statistics.html', context)