@extends('layouts.app')

@section('title', 'Расписание преподавателя')

{{--
    Ports app/Views/schedule/teacher.php (legacy) — see the Phase 45 plan.
    Grid match is start-time-only (compares only the slot's start time
    against each schedule item's begin_time), not the full "HH:00 - HH:50"
    exact-string match TeacherController::show() uses (Phase 42) — a more
    lenient match, preserved verbatim. $timeSlots is also irregular (an
    initial "8:00 - 9:00" slot, then 50-minute slots) — not normalized.

    Styled to match admin/schedule/index.blade.php: discipline-coloured
    cells, badge-styled group link, classroom as the subtext line (where the
    admin grid shows the teacher), fixed-height centred cells, and the same
    html2canvas export button. The discipline colour map is its own copy of
    the one in the admin view's JS — keep the two in sync.
--}}

@push('styles')
<style>
#teacher-schedule-table {
    table-layout: auto;
    width: 100%;
}
#teacher-schedule-table th, #teacher-schedule-table td {
    text-align: center;
    vertical-align: middle;
    height: 70px;
    overflow: hidden;
    word-wrap: break-word;
    min-width: 130px;
}
#teacher-schedule-table th {
    white-space: nowrap;
}
#teacher-schedule-table th.ax-today {
    background-color: var(--ax-primary);
    color: #fff;
}
/* Cells are always light (discipline colours), so keep the subtext dark in both themes. */
#teacher-schedule-table .ax-lesson-teacher {
    color: #333;
}
</style>
@endpush

@section('content')
@php
    $colors = [
        'Математика' => '#90EE90',
        'Физика' => '#ADD8E6',
        'Химия' => '#F08080',
        'Казахский язык' => '#FFFFE0',
        'История' => '#FFB6C1',
        'Биология' => '#D3D3D3',
        'Английский язык' => '#FFFFE0',
        'География' => '#FFA500',
        'Русский язык' => '#008000',
        'Информатика' => '#FF0000',
        'Всемирная история' => '#FFA500',
    ];

    // Build grid[slotStart][dayIndex] = [lesson, ...] once, instead of
    // rescanning every group for every cell.
    $grid = [];
    foreach ($teacherInfo as $group) {
        foreach ($group['schedule'] as $scheduleItem) {
            $scheduleStart = date('H:i', strtotime($scheduleItem['begin_time']));
            foreach ($daysOfWeek as $index => $day) {
                if (($scheduleItem['weekdays'] & (1 << $index)) !== 0) {
                    $grid[$scheduleStart][$index][] = [
                        'group_id' => $group['id'],
                        'group_name' => $group['group_name'],
                        'discipline_name' => $group['discipline_name'] ?? '',
                        'classroom_name' => $scheduleItem['classroom_name'] ?? '',
                    ];
                }
            }
        }
    }

    // ISO weekday: Monday = 1 … Sunday = 7, matching $daysOfWeek's 0-based order.
    $todayIndex = (int) date('N') - 1;
@endphp
<div class="container-fluid">
    <div class="ax-page-header">
        <h1 class="mb-0">Расписание преподавателя</h1>
        <button class="btn btn-success" id="exportBtn">Экспорт в изображение</button>
    </div>

    <div class="table-responsive">
        <table class="table table-bordered" id="teacher-schedule-table">
            <thead>
                <tr>
                    <th>Время</th>
                    @foreach ($daysOfWeek as $index => $day)
                        <th @class(['ax-today' => $index === $todayIndex])>{{ $day }}</th>
                    @endforeach
                </tr>
            </thead>
            <tbody>
                @foreach ($timeSlots as $timeSlot)
                    @php $slotStart = explode(' - ', $timeSlot)[0]; @endphp
                    <tr>
                        <td>{{ $timeSlot }}</td>
                        @foreach ($daysOfWeek as $index => $day)
                            @php
                                $lessons = $grid[$slotStart][$index] ?? [];
                                $cellColor = $lessons ? ($colors[$lessons[0]['discipline_name']] ?? '#ffffff') : null;
                            @endphp
                            <td class="ax-lesson-cell" @if ($cellColor) style="background-color: {{ $cellColor }}" @endif>
                                @foreach ($lessons as $lesson)
                                    <div class="d-flex flex-column align-items-center justify-content-center">
                                        <span class="badge text-truncate w-100"
                                              style="background-color: {{ $colors[$lesson['discipline_name']] ?? '#ffffff' }}; color: #000;">
                                            <a href="/group_admin_info.php?group_id={{ $lesson['group_id'] }}"
                                               style="color: inherit; text-decoration: none;">
                                                {{ $lesson['group_name'] }}
                                            </a>
                                        </span>
                                        @if ($lesson['classroom_name'] !== '')
                                            <span class="ax-lesson-teacher">{{ $lesson['classroom_name'] }}</span>
                                        @endif
                                    </div>
                                @endforeach
                            </td>
                        @endforeach
                    </tr>
                @endforeach
            </tbody>
        </table>
    </div>
</div>
@endsection

@push('scripts')
<script>
document.getElementById('exportBtn').addEventListener('click', () => {
    const scheduleTable = document.getElementById('teacher-schedule-table');

    html2canvas(scheduleTable, { scale: 2 }).then(canvas => {
        const link = document.createElement('a');
        link.download = `teacher_schedule_${new Date().toISOString().slice(0,10)}.png`;
        link.href = canvas.toDataURL();
        link.click();
    }).catch(err => {
        console.error('Ошибка при экспорте:', err);
        alert('Не удалось экспортировать расписание.');
    });
});
</script>
<script src="https://cdn.jsdelivr.net/npm/html2canvas@1.4.1/dist/html2canvas.min.js"></script>
@endpush