"""Tryout management routes for creating, viewing, and managing tryout events.

This module handles CRUD operations for tryouts and player registrations.
"""

from flask import Blueprint, render_template, redirect, url_for, flash, request
from flask_login import login_required, current_user
from extensions import db
from models import User, Tryout, TryoutRegistration, Evaluation, Team, TeamMember, OrgTeam, Match, MatchParticipant, ESPORT_GAMES, GAME_POSITIONS
from datetime import datetime

tryouts_bp = Blueprint('tryouts', __name__, url_prefix='/tryouts')


def can_manage():
    """Check if current user can manage tryouts.

    Returns:
        bool: True if user is president or manager.
    """
    return current_user.role in ['president', 'manager']


@tryouts_bp.route('')
@login_required
def list_tryouts():
    """List all tryouts visible to the current user.

    Shows tryouts filtered by user's role:
        - President: All tryouts
        - Manager: Only their created tryouts
        - Coach: Tryouts targeting their org team
        - Player: Only tryouts they are registered for or participating in

    Returns:
        Response: Rendered tryouts list template.
    """
    if current_user.role == 'president':
        tryouts = Tryout.query.order_by(Tryout.date.desc()).all()
    elif current_user.role == 'manager':
        tryouts = Tryout.query.filter_by(created_by=current_user.id).order_by(Tryout.date.desc()).all()
    elif current_user.role == 'coach':
        # Coaches see tryouts targeting their org team
        org_team = OrgTeam.query.filter_by(coach_id=current_user.id).first()
        if org_team:
            tryouts = Tryout.query.filter_by(target_org_team_id=org_team.id).order_by(Tryout.date.desc()).all()
        else:
            tryouts = []
    elif current_user.role == 'player':
        # Players only see tryouts they are registered for or participating in matches
        from routes.matches import get_visible_tryouts_for_user
        tryouts = get_visible_tryouts_for_user()
    else:
        tryouts = Tryout.query.order_by(Tryout.date.desc()).all()
    return render_template('pages/tryouts.html', tryouts=tryouts, now=datetime.utcnow())


@tryouts_bp.route('/create', methods=['GET', 'POST'])
@login_required
def create_tryout():
    """Create a new tryout event.

    GET: Render the tryout creation form.
    POST: Create a tryout with the submitted details.

    Requires president or manager role.

    Returns:
        Response: Create form or redirect to the new tryout.
    """
    if not can_manage():
        flash('You do not have permission to create tryouts.', 'danger')
        return redirect(url_for('tryouts.list_tryouts'))

    org_teams = OrgTeam.query.order_by(OrgTeam.name).all()
    managers = User.query.filter_by(role='manager', is_active_account=True).order_by(User.full_name).all()
    coaches = User.query.filter_by(role='coach', is_active_account=True).order_by(User.full_name).all()

    if request.method == 'POST':
        title = request.form.get('title')
        description = request.form.get('description')
        game = request.form.get('game')
        date_str = request.form.get('date')
        location = request.form.get('location')
        max_players = request.form.get('max_players')
        target_org_team_id = request.form.get('target_org_team_id')
        manager_id = request.form.get('manager_id')
        coach_id = request.form.get('coach_id')

        try:
            date_obj = datetime.strptime(date_str, '%Y-%m-%d').date()
        except (ValueError, TypeError):
            flash('Invalid date format.', 'danger')
            return render_template('pages/tryout_form.html', tryout=None, org_teams=org_teams, managers=managers, coaches=coaches, esport_games=ESPORT_GAMES)

        tryout = Tryout(
            title=title,
            description=description,
            game=game,
            date=date_obj,
            location=location,
            max_players=int(max_players) if max_players else None,
            created_by=current_user.id,
            status='upcoming',
            target_org_team_id=int(target_org_team_id) if target_org_team_id else None,
            manager_id=int(manager_id) if manager_id else None,
            coach_id=int(coach_id) if coach_id else None
        )
        db.session.add(tryout)
        db.session.commit()
        flash('Tryout created successfully!', 'success')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout.id))

    return render_template('pages/tryout_form.html', tryout=None, org_teams=org_teams, managers=managers, coaches=coaches, esport_games=ESPORT_GAMES)


@tryouts_bp.route('/<int:tryout_id>/edit', methods=['GET', 'POST'])
@login_required
def edit_tryout(tryout_id):
    """Edit an existing tryout event.

    GET: Render the tryout edit form with current data.
    POST: Update the tryout with submitted changes.

    Permission based on can_manage_this_tryout check.

    Args:
        tryout_id: The ID of the tryout to edit.

    Returns:
        Response: Edit form or redirect to tryout view.
    """
    tryout = Tryout.query.get_or_404(tryout_id)

    # Permission: president, manager (own tryouts), or coach (targets their team)
    if not current_user.can_manage_this_tryout(tryout):
        flash('You do not have permission to edit this tryout.', 'danger')
        return redirect(url_for('tryouts.list_tryouts'))

    org_teams = OrgTeam.query.order_by(OrgTeam.name).all()
    managers = User.query.filter_by(role='manager', is_active_account=True).order_by(User.full_name).all()
    coaches = User.query.filter_by(role='coach', is_active_account=True).order_by(User.full_name).all()

    if request.method == 'POST':
        title = request.form.get('title')
        description = request.form.get('description')
        game = request.form.get('game')
        date_str = request.form.get('date')
        location = request.form.get('location')
        max_players = request.form.get('max_players')
        target_org_team_id = request.form.get('target_org_team_id')
        manager_id = request.form.get('manager_id')
        coach_id = request.form.get('coach_id')

        try:
            date_obj = datetime.strptime(date_str, '%Y-%m-%d').date()
        except (ValueError, TypeError):
            flash('Invalid date format.', 'danger')
            return render_template('pages/tryout_form.html', tryout=tryout, org_teams=org_teams, managers=managers, coaches=coaches, esport_games=ESPORT_GAMES)

        tryout.title = title
        tryout.description = description
        tryout.game = game
        tryout.date = date_obj
        tryout.location = location
        tryout.max_players = int(max_players) if max_players else None
        tryout.target_org_team_id = int(target_org_team_id) if target_org_team_id else None
        tryout.manager_id = int(manager_id) if manager_id else None
        tryout.coach_id = int(coach_id) if coach_id else None
        db.session.commit()
        flash('Tryout updated successfully!', 'success')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout.id))

    return render_template('pages/tryout_form.html', tryout=tryout, org_teams=org_teams, managers=managers, coaches=coaches, esport_games=ESPORT_GAMES)


@tryouts_bp.route('/<int:tryout_id>')
@login_required
def view_tryout(tryout_id):
    """View a specific tryout with all details.

    Displays tryout information, registered players, evaluations, teams,
    matches, and evaluation status information.

    Args:
        tryout_id: The ID of the tryout to view.

    Returns:
        Response: Rendered tryout detail template.
    """
    tryout = Tryout.query.get_or_404(tryout_id)

    # Check if user has permission to view this tryout
    can_view = False
    if current_user.role == 'president':
        can_view = True
    elif current_user.role == 'manager' and tryout.created_by == current_user.id:
        can_view = True
    elif current_user.role == 'coach':
        org_team = OrgTeam.query.filter_by(coach_id=current_user.id).first()
        if org_team and tryout.target_org_team_id == org_team.id:
            can_view = True
    elif current_user.role == 'player':
        is_registered = TryoutRegistration.query.filter_by(
            tryout_id=tryout_id, player_id=current_user.id
        ).first() is not None
        player_in_match = MatchParticipant.query.join(Match).filter(
            MatchParticipant.player_id == current_user.id,
            Match.tryout_id == tryout_id
        ).first() is not None
        can_view = is_registered or player_in_match
    elif current_user.role == 'scout':
        can_view = True

    if not can_view:
        flash('You do not have permission to view this tryout.', 'danger')
        return redirect(url_for('tryouts.list_tryouts'))

    registrations = TryoutRegistration.query.filter_by(tryout_id=tryout_id).all()
    registered_players = [User.query.get(r.player_id) for r in registrations if r.player_id]
    evaluations = Evaluation.query.filter_by(tryout_id=tryout_id).all()

    evaluator_ids = set(e.evaluator_id for e in evaluations)
    player_ids_with_eval = set(e.player_id for e in evaluations)

    # Check if current user has evaluated each player
    player_eval_status = {}
    if current_user.can_evaluate():
        for p in registered_players:
            existing = Evaluation.query.filter_by(
                tryout_id=tryout_id,
                player_id=p.id,
                evaluator_id=current_user.id
            ).first()
            player_eval_status[p.id] = existing is not None

    is_registered = TryoutRegistration.query.filter_by(
        tryout_id=tryout_id, player_id=current_user.id
    ).first() is not None

    teams = Team.query.filter_by(tryout_id=tryout_id).all()
    team_data = []
    for team in teams:
        members = TeamMember.query.filter_by(team_id=team.id).all()
        team_data.append({
            'team': team,
            'members': [{'player': User.query.get(m.player_id), 'position': m.position} for m in members]
        })

    # Determine if current user can edit this tryout
    can_edit = current_user.can_manage_this_tryout(tryout)

    # Determine if current user can view the calendar (managers/coaches can always see it)
    # Players need to be registered or participating in a match
    can_view_calendar = can_edit
    if current_user.role == 'player':
        # Check if player is participating in any matches for this tryout
        player_in_match = MatchParticipant.query.join(Match).filter(
            MatchParticipant.player_id == current_user.id,
            Match.tryout_id == tryout_id
        ).first() is not None

        can_view_calendar = is_registered or player_in_match

    # Only expose all_players to users who can manage players in this tryout
    all_players = None
    if can_edit:
        all_players = User.query.filter_by(role='player').order_by(User.full_name).all()

    # Get matches for this tryout with participant info
    matches = Match.query.filter_by(tryout_id=tryout_id).order_by(Match.date, Match.start_time).all()
    match_data = []
    for match in matches:
        if match.match_type == 'team_vs_team':
            participants = {
                'team1': match.team1.name if match.team1 else 'TBD',
                'team2': match.team2.name if match.team2 else 'TBD',
                'team1_players': [{'name': m.player.full_name, 'position': m.position} for m in match.team1.members.all()] if match.team1 else [],
                'team2_players': [{'name': m.player.full_name, 'position': m.position} for m in match.team2.members.all()] if match.team2 else []
            }
        elif match.match_type == 'player_vs_player':
            team1_players = [{'name': p.player.full_name, 'position': p.position} for p in match.participants.filter_by(team_side=1).all() if p.player]
            team2_players = [{'name': p.player.full_name, 'position': p.position} for p in match.participants.filter_by(team_side=2).all() if p.player]
            participants = {
                'team1': 'Team 1',
                'team2': 'Team 2',
                'team1_players': team1_players,
                'team2_players': team2_players
            }
        else:
            participants = [p.player.full_name for p in match.participants.all()]
        match_data.append({
            'match': match,
            'participants': participants
        })

    return render_template('pages/view_tryout.html',
                         tryout=tryout,
                         registered_players=registered_players,
                         evaluations=evaluations,
                         player_eval_status=player_eval_status,
                         is_registered=is_registered,
                         registrations=registrations,
                         team_data=team_data,
                         can_edit=can_edit,
                         can_view_calendar=can_view_calendar,
                         all_players=all_players,
                         matches=matches,
                         match_data=match_data,
                         game_positions=GAME_POSITIONS,
                         now=datetime.utcnow())


@tryouts_bp.route('/<int:tryout_id>/register', methods=['POST'])
@login_required
def register_for_tryout(tryout_id):
    """Register a player for a tryout.

    Allows players to register for tryouts. Validates that the tryout
    is accepting registrations and not at capacity.

    Args:
        tryout_id: The ID of the tryout to register for.

    Returns:
        Response: Redirect to tryout view with status message.
    """
    tryout = Tryout.query.get_or_404(tryout_id)
    if current_user.role != 'player':
        flash('Only players can register for tryouts.', 'danger')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    if tryout.status not in ['upcoming', 'in_progress']:
        flash('This tryout is not accepting registrations.', 'danger')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    existing = TryoutRegistration.query.filter_by(tryout_id=tryout_id, player_id=current_user.id).first()
    if existing:
        flash('You are already registered for this tryout.', 'info')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    if tryout.max_players:
        count = TryoutRegistration.query.filter_by(tryout_id=tryout_id).count()
        if count >= tryout.max_players:
            flash('This tryout is full.', 'danger')
            return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    registration = TryoutRegistration(tryout_id=tryout_id, player_id=current_user.id)
    db.session.add(registration)
    db.session.commit()
    flash('Successfully registered for tryout!', 'success')
    return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))


@tryouts_bp.route('/<int:tryout_id>/status', methods=['POST'])
@login_required
def update_status(tryout_id):
    """Update the status of a tryout.

    Changes tryout status between upcoming, in_progress, and completed.

    Args:
        tryout_id: The ID of the tryout to update.

    Returns:
        Response: Redirect to tryout view.
    """
    tryout = Tryout.query.get_or_404(tryout_id)
    if not current_user.can_manage_this_tryout(tryout):
        flash('Permission denied.', 'danger')
        return redirect(url_for('tryouts.list_tryouts'))
    new_status = request.form.get('status')
    if new_status in ['upcoming', 'in_progress', 'completed']:
        tryout.status = new_status
        db.session.commit()
        flash(f'Tryout status updated to {new_status}.', 'success')
    return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))


@tryouts_bp.route('/<int:tryout_id>/registration/<int:player_id>/status', methods=['POST'])
@login_required
def update_registration_status(tryout_id, player_id):
    """Update the attendance status of a tryout registration.

    Args:
        tryout_id: The ID of the tryout.
        player_id: The ID of the player whose status to update.

    Returns:
        Response: Redirect to tryout view.
    """
    tryout = Tryout.query.get_or_404(tryout_id)
    if not current_user.can_manage_this_tryout(tryout):
        flash('Permission denied.', 'danger')
        return redirect(url_for('tryouts.list_tryouts'))

    registration = TryoutRegistration.query.filter_by(tryout_id=tryout_id, player_id=player_id).first_or_404()
    new_status = request.form.get('status')
    if new_status in ['registered', 'attended', 'no_show']:
        registration.status = new_status
        db.session.commit()
        flash('Registration status updated.', 'success')
    return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))


@tryouts_bp.route('/<int:tryout_id>/register_player', methods=['POST'])
@login_required
def register_player(tryout_id):
    """Manually register a player for a tryout (by managers/coaches).

    Allows authorized users to register players on their behalf.

    Args:
        tryout_id: The ID of the tryout.

    Returns:
        Response: Redirect to tryout view with status message.
    """
    tryout = Tryout.query.get_or_404(tryout_id)
    if not current_user.can_manage_this_tryout(tryout):
        flash('Permission denied.', 'danger')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))
    player_id = request.form.get('player_id')

    if not player_id:
        flash('Please select a player.', 'danger')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    player = User.query.get_or_404(int(player_id))
    if player.role != 'player':
        flash('Can only register players.', 'danger')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    existing = TryoutRegistration.query.filter_by(tryout_id=tryout_id, player_id=player.id).first()
    if existing:
        flash(f'{player.full_name} is already registered for this tryout.', 'info')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    if tryout.max_players:
        count = TryoutRegistration.query.filter_by(tryout_id=tryout_id).count()
        if count >= tryout.max_players:
            flash('This tryout is full.', 'danger')
            return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    registration = TryoutRegistration(tryout_id=tryout_id, player_id=player.id)
    db.session.add(registration)
    db.session.commit()
    flash(f'{player.full_name} registered for tryout!', 'success')
    return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))


@tryouts_bp.route('/<int:tryout_id>/team/create', methods=['POST'])
@login_required
def create_team(tryout_id):
    """Create a tryout-specific team.

    Args:
        tryout_id: The ID of the tryout to create the team for.

    Returns:
        Response: Redirect to tryout view with status message.
    """
    tryout = Tryout.query.get_or_404(tryout_id)
    if not current_user.can_manage_this_tryout(tryout):
        flash('Permission denied.', 'danger')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    team_name = request.form.get('team_name')
    if team_name:
        team = Team(tryout_id=tryout_id, name=team_name, created_by=current_user.id)
        db.session.add(team)
        db.session.commit()
        flash(f'Team "{team_name}" created!', 'success')
    return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))


@tryouts_bp.route('/<int:tryout_id>/team/<int:team_id>/add', methods=['POST'])
@login_required
def add_to_team(tryout_id, team_id):
    """Add a player to a tryout team.

    Args:
        tryout_id: The ID of the tryout.
        team_id: The ID of the team to add the player to.

    Returns:
        Response: Redirect to tryout view with status message.
    """
    team = Team.query.get_or_404(team_id)
    tryout = Tryout.query.get_or_404(tryout_id)
    if not current_user.can_manage_this_tryout(tryout):
        flash('Permission denied.', 'danger')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    player_id = request.form.get('player_id')
    position = request.form.get('position', '')

    existing = TeamMember.query.filter_by(team_id=team_id, player_id=player_id).first()
    if existing:
        flash('Player is already on this team.', 'info')
    else:
        member = TeamMember(team_id=team_id, player_id=int(player_id), position=position)
        db.session.add(member)
        db.session.commit()
        flash('Player added to team!', 'success')

    return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))