"""When people are free.

Two calendars that share a shape without sharing a purpose: a player's
weekly availability blocks, and a coach's bookable slots for one-on-one
sessions.
"""

from datetime import datetime, timedelta

from flask import flash, jsonify, redirect, render_template, request, url_for
from flask_babel import gettext as _
from flask_login import current_user, login_required

from app.api import json_endpoint
from app.extensions import db
from app.models import Coach, CoachAvailability, PlayerDisponibility, User
from app.routes.users.blueprint import users_bp

DAY_NAMES = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']


def add_30_minutes(t):
    return (datetime.combine(datetime.today(), t) + timedelta(minutes=30)).time()


@users_bp.route('/disponibilities')
@json_endpoint
@login_required
def get_disponibilities():
    """API endpoint to get all player disponibilities for scheduling."""
    if not current_user.can_manage_teams() and not current_user.can_schedule_matches():
        return jsonify({'error': 'Unauthorized'}), 403

    players = (
        User.query.filter_by(role='player', is_active_account=True).order_by(User.username).all()
    )
    result = {}
    for player in players:
        disponibilities = list(player.disponibilities)
        result[player.id] = {
            'username': player.username,
            'disponibilities': [
                {
                    'id': d.id,
                    'day_of_week': d.day_of_week,
                    'day_name': DAY_NAMES[d.day_of_week],
                    'start_time': d.start_time.strftime('%H:%M'),
                    'end_time': d.end_time.strftime('%H:%M'),
                }
                for d in disponibilities
            ],
        }
    return jsonify(result)


@users_bp.route('/disponibilities/my')
@json_endpoint
@login_required
def get_my_disponibilities():
    """API endpoint for players to get their own disponibilities."""
    disponibilities = PlayerDisponibility.query.filter_by(player_id=current_user.id).all()
    result = {}
    for d in disponibilities:
        day = d.day_of_week
        if day not in result:
            result[day] = []
        result[day].append(
            {
                'id': d.id,
                'day_of_week': d.day_of_week,
                'day_name': DAY_NAMES[d.day_of_week],
                'start_time': d.start_time.strftime('%H:%M'),
                'end_time': d.end_time.strftime('%H:%M'),
            }
        )
    return jsonify(result)


@users_bp.route('/disponibilities/add', methods=['POST'])
@json_endpoint
@login_required
def add_disponibility():
    """Add a disponibility block for the current player."""
    day_of_week = request.form.get('day_of_week', type=int)
    start_time_str = request.form.get('start_time')
    if day_of_week is None or day_of_week < 0 or day_of_week > 6:
        return jsonify({'error': 'Invalid day of week'}), 400
    try:
        start_time = datetime.strptime(start_time_str, '%H:%M').time()
    except (ValueError, TypeError):
        return jsonify({'error': 'Invalid time format'}), 400

    end_time = add_30_minutes(start_time)
    disponibility = PlayerDisponibility(
        player_id=current_user.id,
        day_of_week=day_of_week,
        start_time=start_time,
        end_time=end_time,
    )
    db.session.add(disponibility)
    db.session.commit()
    return jsonify(
        {
            'id': disponibility.id,
            'day_of_week': disponibility.day_of_week,
            'day_name': DAY_NAMES[disponibility.day_of_week],
            'start_time': disponibility.start_time.strftime('%H:%M'),
            'end_time': disponibility.end_time.strftime('%H:%M'),
        }
    )


@users_bp.route('/disponibilities/add_bulk', methods=['POST'])
@json_endpoint
@login_required
def add_disponibilities_bulk():
    """Add multiple disponibility blocks at once."""
    data = request.get_json()
    slots = data.get('slots', [])
    created = []
    for slot in slots:
        day_of_week = slot.get('day_of_week')
        start_time_str = slot.get('start_time')
        if day_of_week is None or day_of_week < 0 or day_of_week > 6:
            continue
        try:
            start_time = datetime.strptime(start_time_str, '%H:%M').time()
        except (ValueError, TypeError):
            continue

        end_time = add_30_minutes(start_time)
        existing = PlayerDisponibility.query.filter_by(
            player_id=current_user.id,
            day_of_week=day_of_week,
            start_time=start_time,
        ).first()
        if not existing:
            disponibility = PlayerDisponibility(
                player_id=current_user.id,
                day_of_week=day_of_week,
                start_time=start_time,
                end_time=end_time,
            )
            db.session.add(disponibility)
            db.session.flush()
            created.append(
                {
                    'id': disponibility.id,
                    'day_of_week': disponibility.day_of_week,
                    'day_name': DAY_NAMES[disponibility.day_of_week],
                    'start_time': disponibility.start_time.strftime('%H:%M'),
                }
            )
    db.session.commit()
    return jsonify({'success': True, 'created': created})


@users_bp.route('/disponibilities/clear', methods=['POST'])
@json_endpoint
@login_required
def clear_disponibilities():
    """Clear all disponibilities for the current player."""
    PlayerDisponibility.query.filter_by(player_id=current_user.id).delete()
    db.session.commit()
    return jsonify({'success': True})


@users_bp.route('/disponibilities/<int:disponibility_id>/delete', methods=['POST'])
@json_endpoint
@login_required
def delete_disponibility(disponibility_id):
    """Delete a disponibility block."""
    disponibility = PlayerDisponibility.query.get_or_404(disponibility_id)
    if disponibility.player_id != current_user.id:
        return jsonify({'error': 'Unauthorized'}), 403
    db.session.delete(disponibility)
    db.session.commit()
    return jsonify({'success': True})


@users_bp.route('/coach-availability', methods=['GET', 'POST'])
@json_endpoint
@login_required
def manage_coach_availability():
    """Manage coach availability for One on One sessions."""
    if not isinstance(current_user, Coach):
        flash(_('Only coaches can manage availability.'), 'danger')
        return redirect(url_for('main.dashboard'))

    if request.method == 'POST':
        data = request.get_json()
        slots = data.get('slots', []) if data else []

        # Clear existing availability
        CoachAvailability.query.filter_by(coach_id=current_user.id).delete()

        # Add new slots
        for slot in slots:
            day_of_week = slot.get('day_of_week')
            start_time_str = slot.get('start_time')
            if day_of_week is None or day_of_week < 0 or day_of_week > 6:
                continue
            try:
                start_time = datetime.strptime(start_time_str, '%H:%M').time()
                end_time = (
                    datetime.combine(datetime.today(), start_time) + timedelta(minutes=30)
                ).time()
            except (ValueError, TypeError):
                continue

            availability = CoachAvailability(
                coach_id=current_user.id,
                day_of_week=day_of_week,
                start_time=start_time,
                end_time=end_time,
            )
            db.session.add(availability)

        db.session.commit()
        return jsonify({'success': True})

    existing_availability = CoachAvailability.query.filter_by(
        coach_id=current_user.id,
    ).all()

    return render_template(
        'pages/coach_availability.html', existing_availability=existing_availability
    )


@users_bp.route('/coach-availability/clear', methods=['POST'])
@json_endpoint
@login_required
def clear_coach_availability():
    """Clear all coach availability slots."""
    if not isinstance(current_user, Coach):
        return jsonify({'error': 'Unauthorized'}), 403

    CoachAvailability.query.filter_by(coach_id=current_user.id).delete()
    db.session.commit()
    return jsonify({'success': True})