"""Team match management routes for regular season matches.

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

from datetime import datetime

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

from app.api import json_endpoint
from app.extensions import db
from app.forms import flash_validation_errors, form_payload
from app.models import (
    Admin,
    Coach,
    Manager,
    OrgTeam,
    Player,
    TeamMatch,
    TeamMatchParticipant,
    TeamPlayer,
)
from app.pagination import paginate
from app.permissions import can_manage_org_team, coach_org_teams, visible_org_teams
from app.routes.matches import default_end_time
from app.services.scheduling import notify_participants, zip_participants
from app.validators import TeamMatchSchema

team_matches_bp = Blueprint('team_matches', __name__, url_prefix='/team-matches')


def can_manage_team_match(team):
    """Whether the current user can manage matches for this team.

    Same rule as administering the team itself, so it is the same call.
    This function used to restate it, and the restatement drifted.
    """
    return can_manage_org_team(current_user, team)


@team_matches_bp.route('')
@login_required
def list_matches():
    """List all team matches visible to the current user."""
    filter_team_id = request.args.get('team_id', type=int)

    # A manager administers every team, so the listing shows them all;
    # visible_org_teams() only reports the teams they are attached to.
    if isinstance(current_user, (Admin, Manager)):
        teams = OrgTeam.query.order_by(OrgTeam.name).all()
        matches_query = TeamMatch.query
    elif isinstance(current_user, (Coach, Player)):
        teams = visible_org_teams(current_user)
        team_ids = [t.id for t in teams]
        matches_query = (
            TeamMatch.query.filter(
                TeamMatch.org_team_id.in_(team_ids),
            )
            if team_ids
            else TeamMatch.query.filter(TeamMatch.id == -1)
        )
    else:
        teams = []
        matches_query = TeamMatch.query.filter(TeamMatch.id == -1)

    if filter_team_id:
        matches_query = matches_query.filter(TeamMatch.org_team_id == filter_team_id)

    # Pagination also bounds the per-match participant loop below, which is
    # the N+1 the constat pointed at (MNT-10 combined with MNT-14).
    matches_page = paginate(matches_query.order_by(TeamMatch.date.desc(), TeamMatch.id))
    matches = matches_page.items

    match_data = []
    for tm in matches:
        confirmed, total = tm.get_confirmed_count()
        participants = []
        for p in tm.participants.all():
            participants.append(
                {
                    'id': p.id,
                    'player': p.player,
                    'is_confirmed': p.is_confirmed,
                }
            )
        match_data.append(
            {
                'match': tm,
                'participants': participants,
                'confirmed_count': confirmed,
                'total_count': total,
            }
        )

    return render_template(
        'pages/team_matches.html',
        teams=teams,
        match_data=match_data,
        pagination=matches_page,
        now=datetime.utcnow(),
    )


@team_matches_bp.route('/<int:team_id>/create', methods=['GET', 'POST'])
@login_required
def create_match(team_id):
    """Create a new regular-season team match."""
    team = OrgTeam.query.get_or_404(team_id)
    if not can_manage_team_match(team):
        flash(_('You do not have permission to schedule matches for this team.'), 'danger')
        return redirect(url_for('team_matches.list_matches'))

    team_players = TeamPlayer.query.filter_by(org_team_id=team_id).all()
    prefill_date = request.args.get('date', '')
    is_practice = request.args.get('type') == 'practice'
    default_title = 'Practice' if is_practice else f'Team Match — {team.name}'

    if is_practice and request.method == 'GET':

        class TryoutProxy:
            def __init__(self, team_obj):
                self.id = 0
                self.title = team_obj.name
                self.date = ''
                self.game = ''
                self.target_org_team = team_obj

        proxy_tryout = TryoutProxy(team)
        all_players = [tp.player for tp in team_players if tp.player]

        return render_template(
            'pages/match_form.html',
            tryout=proxy_tryout,
            teams=[],
            all_players=all_players,
            prefill_date=prefill_date,
            is_practice=True,
            team_id=team_id,
            team=team,
        )

    if request.method == 'POST':
        payload = form_payload(list_fields=(), optional_blank=())
        # A practice has no opponent, whatever the form sent.
        payload.setdefault('title', default_title)
        if is_practice:
            payload.pop('opponent', None)

        try:
            data = TeamMatchSchema().load(payload)
        except ValidationError as err:
            flash_validation_errors(err)
            return render_template(
                'pages/team_match_form.html',
                team=team,
                team_players=team_players,
                prefill_date=prefill_date,
                is_practice=is_practice,
            )

        start_time = data['start_time']
        end_time = data['end_time'] or default_end_time(data['date'], start_time)

        team_match = TeamMatch(
            org_team_id=team_id,
            title=data['title'],
            description=data['description'],
            opponent=data['opponent'],
            date=data['date'],
            start_time=start_time,
            end_time=end_time,
            location=data['location'],
            created_by=current_user.id,
        )
        db.session.add(team_match)
        db.session.flush()

        notified_participant_ids = []
        for tp in team_players:
            participant = TeamMatchParticipant(
                team_match_id=team_match.id,
                player_id=tp.player_id,
            )
            db.session.add(participant)
            db.session.flush()
            notified_participant_ids.append(participant.id)

        db.session.commit()

        notify_participants(
            title=team_match.title,
            date=team_match.date,
            start_time=start_time,
            end_time=end_time,
            participants=zip_participants(
                [tp.player_id for tp in team_players], notified_participant_ids
            ),
            fallback_id=team_match.id,
        )

        flash(
            _('Team match "%(title)s" scheduled successfully!', title=team_match.title), 'success'
        )
        return redirect(url_for('team_matches.list_matches'))

    return render_template('pages/team_match_form.html', team=team, team_players=team_players)


@team_matches_bp.route('/<int:match_id>/edit', methods=['GET', 'POST'])
@login_required
def edit_match(match_id):
    """Edit an existing team match."""
    team_match = TeamMatch.query.get_or_404(match_id)
    team = team_match.org_team

    if not can_manage_team_match(team):
        flash(_('You do not have permission to edit this match.'), 'danger')
        return redirect(url_for('team_matches.list_matches'))

    if request.method == 'POST':
        # The three date and time fields used to be checked one at a time,
        # each flashing and redirecting on its own: a form with two mistakes
        # took two round trips to be told about both. One schema now, every
        # problem reported at once and in place.
        #
        # Known limit: the re-render reads the stored record, so what was
        # typed is not echoed back. Repopulating the form from the
        # submission is a separate change to the template.
        try:
            data = TeamMatchSchema().load(form_payload(list_fields=(), optional_blank=()))
        except ValidationError as err:
            flash_validation_errors(err)
            return render_template(
                'pages/team_match_form.html', match=team_match, team=team, team_players=[]
            )

        team_match.title = data['title']
        team_match.description = data['description']
        team_match.opponent = data['opponent']
        team_match.date = data['date']
        team_match.start_time = data['start_time']
        team_match.end_time = data['end_time'] or default_end_time(data['date'], data['start_time'])
        team_match.location = data['location']
        team_match.status = data['status']

        db.session.commit()
        flash(_('Match updated successfully!'), 'success')
        return redirect(url_for('team_matches.list_matches'))

    return render_template(
        'pages/team_match_form.html', match=team_match, team=team, team_players=[]
    )


@team_matches_bp.route('/<int:match_id>/delete', methods=['POST'])
@login_required
def delete_match(match_id):
    """Delete a team match."""
    team_match = TeamMatch.query.get_or_404(match_id)
    team = team_match.org_team
    if not can_manage_team_match(team):
        flash(_('You do not have permission to delete this match.'), 'danger')
        return redirect(url_for('team_matches.list_matches'))
    db.session.delete(team_match)
    db.session.commit()
    flash(_('Match deleted successfully.'), 'success')
    return redirect(url_for('team_matches.list_matches'))


@team_matches_bp.route('/api/manageable-teams')
@json_endpoint
@login_required
def api_manageable_teams():
    """API endpoint returning teams the current user can schedule matches for."""
    if not current_user.can_schedule_matches():
        return jsonify([])

    if isinstance(current_user, (Admin, Manager)):
        teams = OrgTeam.query.order_by(OrgTeam.name).all()
    elif isinstance(current_user, Coach):
        teams = coach_org_teams(current_user)
    else:
        return jsonify([])

    return jsonify([{'id': t.id, 'name': t.name} for t in teams])


@team_matches_bp.route('/<int:match_id>/toggle-presence/<int:participant_id>', methods=['POST'])
@json_endpoint
@login_required
def toggle_presence(match_id, participant_id):
    """Toggle is_confirmed for a team match participant."""
    team_match = TeamMatch.query.get_or_404(match_id)
    team = team_match.org_team

    participant = TeamMatchParticipant.query.get_or_404(participant_id)
    if participant.team_match_id != match_id:
        return jsonify({'error': 'Participant does not belong to this match'}), 400

    can_toggle = can_manage_team_match(team) or participant.player_id == current_user.id
    if not can_toggle:
        return jsonify({'error': 'Unauthorized'}), 403

    participant.is_confirmed = not participant.is_confirmed
    db.session.commit()
    return jsonify(
        {
            'participant_id': participant.id,
            'is_confirmed': participant.is_confirmed,
            'player_name': participant.player.username if participant.player else 'Unknown',
        }
    )