"""Evaluation routes for assessing player performance during tryouts.

Uses polymorphic isinstance checks instead of role-string comparisons.
"""

from flask import Blueprint, render_template, redirect, url_for, flash, request
from flask_login import login_required, current_user
from app.extensions import db
from app.models import (
    Admin, Coach, Manager, Player,
    User, Tryout, Evaluation, TryoutRegistration,
    OrgTeam, GAME_POSITIONS,
)
from sqlalchemy import func
from sqlalchemy.orm import aliased

evaluations_bp = Blueprint('evaluations', __name__, url_prefix='/evaluations')


def validate_score(score_value):
    """Validate that a score is between 1 and 10."""
    if score_value is None:
        return None
    try:
        score = int(score_value)
        if 1 <= score <= 10:
            return score
        return None
    except (ValueError, TypeError):
        return None


@evaluations_bp.route('')
@login_required
def list_evaluations():
    """List all evaluations accessible to the current user."""
    user = current_user

    if isinstance(user, Player):
        flash('You do not have permission to view evaluations.', 'danger')
        return redirect(url_for('main.dashboard'))

    sort_column = request.args.get('sort', 'created_at')
    sort_order = request.args.get('order', 'desc')
    if sort_order not in ('asc', 'desc'):
        sort_order = 'desc'

    player_alias = aliased(User, name='eval_player')
    evaluator_alias = aliased(User, name='eval_evaluator')

    sort_map = {
        'tryout': Tryout.title,
        'player': player_alias.username,
        'evaluator': evaluator_alias.username,
        'mecanics_score': Evaluation.mecanics_score,
        'cohesion_score': Evaluation.cohesion_score,
        'communication_score': Evaluation.communication_score,
        'gamesense_score': Evaluation.gamesense_score,
        'versatility_score': Evaluation.versatility_score,
        'discipline_score': Evaluation.discipline_score,
        'analysis_score': Evaluation.analysis_score,
        'sport_ethics_score': Evaluation.sport_ethics_score,
        'mental_score': Evaluation.mental_score,
        'overall_score': Evaluation.overall_score,
        'position_recommendation': Evaluation.position_recommendation,
        'created_at': Evaluation.created_at,
    }

    sort_expr = sort_map.get(sort_column, Evaluation.created_at)
    if sort_order == 'asc':
        sort_expr = sort_expr.asc()
    else:
        sort_expr = sort_expr.desc()

    if isinstance(user, Admin):
        evaluations = Evaluation.query \
            .outerjoin(Tryout, Evaluation.tryout_id == Tryout.id) \
            .outerjoin(player_alias, Evaluation.player_id == player_alias.id) \
            .outerjoin(evaluator_alias, Evaluation.evaluator_id == evaluator_alias.id) \
            .order_by(sort_expr).all()
        avg_scores = db.session.query(
            Evaluation.player_id,
            func.count(Evaluation.id).label('eval_count'),
            func.avg(Evaluation.overall_score).label('avg_score'),
        ).group_by(Evaluation.player_id).all()
        player_scores = {}
        for row in avg_scores:
            p = User.query.get(row.player_id)
            if p:
                player_scores[p.id] = {
                    'player': p, 'count': row.eval_count,
                    'avg': round(row.avg_score, 1) if row.avg_score else 0,
                }
    elif user.can_evaluate():
        evaluations = Evaluation.query \
            .outerjoin(Tryout, Evaluation.tryout_id == Tryout.id) \
            .outerjoin(player_alias, Evaluation.player_id == player_alias.id) \
            .outerjoin(evaluator_alias, Evaluation.evaluator_id == evaluator_alias.id) \
            .filter(Evaluation.evaluator_id == user.id) \
            .order_by(sort_expr).all()
        player_scores = {}
    else:
        evaluations = Evaluation.query \
            .outerjoin(Tryout, Evaluation.tryout_id == Tryout.id) \
            .outerjoin(player_alias, Evaluation.player_id == player_alias.id) \
            .outerjoin(evaluator_alias, Evaluation.evaluator_id == evaluator_alias.id) \
            .filter(Evaluation.player_id == user.id) \
            .order_by(sort_expr).all()
        player_scores = {}

    return render_template('pages/evaluations.html',
                           evaluations=evaluations, player_scores=player_scores,
                           sort_column=sort_column, sort_order=sort_order)


@evaluations_bp.route('/<int:tryout_id>/<int:player_id>', methods=['GET', 'POST'])
@login_required
def evaluate_player(tryout_id, player_id):
    """Evaluate a specific player in a tryout."""
    if not current_user.can_evaluate():
        flash('You do not have permission to evaluate players.', 'danger')
        return redirect(url_for('main.dashboard'))

    tryout = Tryout.query.get_or_404(tryout_id)
    if not current_user.can_manage_this_tryout(tryout):
        flash('You do not have permission to evaluate players in this tryout.', 'danger')
        return redirect(url_for('tryouts.list_tryouts'))

    is_registered = TryoutRegistration.query.filter_by(
        tryout_id=tryout_id, player_id=player_id,
    ).first() is not None
    if not is_registered:
        flash('Player is not registered for this tryout.', 'danger')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    player = User.query.get_or_404(player_id)
    if not isinstance(player, Player):
        flash('Can only evaluate players.', 'danger')
        return redirect(url_for('tryouts.view_tryout', tryout_id=tryout_id))

    existing_eval = Evaluation.query.filter_by(
        tryout_id=tryout_id, player_id=player_id, evaluator_id=current_user.id,
    ).first()

    if request.method == 'POST':
        mecanics = validate_score(request.form.get('mecanics_score'))
        cohesion = validate_score(request.form.get('cohesion_score'))
        communication = validate_score(request.form.get('communication_score'))
        gamesense = validate_score(request.form.get('gamesense_score'))
        versatility = validate_score(request.form.get('versatility_score'))
        discipline = validate_score(request.form.get('discipline_score'))
        analysis = validate_score(request.form.get('analysis_score'))
        sport_ethics = validate_score(request.form.get('sport_ethics_score'))
        mental = validate_score(request.form.get('mental_score'))
        comments = request.form.get('comments')
        position = request.form.get('position_recommendation')

        scores = [s for s in [mecanics, cohesion, communication, gamesense,
                              versatility, discipline, analysis, sport_ethics, mental]
                  if s is not None]
        overall = sum(scores) / len(scores) if scores else None

        if existing_eval:
            existing_eval.mecanics_score = mecanics
            existing_eval.cohesion_score = cohesion
            existing_eval.communication_score = communication
            existing_eval.gamesense_score = gamesense
            existing_eval.versatility_score = versatility
            existing_eval.discipline_score = discipline
            existing_eval.analysis_score = analysis
            existing_eval.sport_ethics_score = sport_ethics
            existing_eval.mental_score = mental
            existing_eval.overall_score = overall
            existing_eval.comments = comments
            existing_eval.position_recommendation = position
            flash('Evaluation updated!', 'success')
        else:
            evaluation = Evaluation(
                tryout_id=tryout_id, player_id=player_id,
                evaluator_id=current_user.id,
                mecanics_score=mecanics, cohesion_score=cohesion,
                communication_score=communication, gamesense_score=gamesense,
                versatility_score=versatility, discipline_score=discipline,
                analysis_score=analysis, sport_ethics_score=sport_ethics,
                mental_score=mental, overall_score=overall,
                comments=comments, position_recommendation=position,
            )
            db.session.add(evaluation)
            flash('Evaluation submitted successfully!', 'success')

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

    evaluators = None
    if isinstance(current_user, Admin):
        all_evaluations = Evaluation.query.filter_by(
            tryout_id=tryout_id, player_id=player_id,
        ).all()
        evaluators = [{'evaluator': User.query.get(e.evaluator_id), 'eval': e}
                      for e in all_evaluations]

    return render_template('pages/evaluate_player.html',
                           tryout=tryout, player=player,
                           existing_eval=existing_eval,
                           evaluators=evaluators,
                           game_positions=GAME_POSITIONS)


@evaluations_bp.route('/<int:tryout_id>/players')
@login_required
def players_to_evaluate(tryout_id):
    """List players that need evaluation in a specific tryout."""
    if not current_user.can_evaluate():
        flash('Permission denied.', 'danger')
        return redirect(url_for('main.dashboard'))

    tryout = Tryout.query.get_or_404(tryout_id)
    if not current_user.can_manage_this_tryout(tryout):
        flash('You do not have permission to evaluate players in this tryout.', 'danger')
        return redirect(url_for('tryouts.list_tryouts'))

    registrations = TryoutRegistration.query.filter_by(tryout_id=tryout_id).all()
    players = []
    for reg in registrations:
        p = User.query.get(reg.player_id)
        if p and isinstance(p, Player):
            existing = Evaluation.query.filter_by(
                tryout_id=tryout_id, player_id=p.id, evaluator_id=current_user.id,
            ).first()
            players.append({'player': p, 'evaluated': existing is not None,
                            'registration': reg})

    return render_template('pages/players_to_evaluate.html', tryout=tryout, players=players)