@extends('layouts.app')

@section('content')
<div class="container-fluid">
    <div class="row">
        <div class="col-md-12">
            <div class="card shadow-sm border-0 rounded-3">
                <div class="card-header bg-primary text-white d-flex justify-content-between align-items-center">
                    <h4 class="mb-0">
                        <i class="fas fa-layer-group me-2"></i> Class Management Assignments
                    </h4>
                    <a href="{{ route('classes.create') }}" class="btn btn-light btn-sm">
                        <i class="fas fa-plus"></i> New Assignment
                    </a>
                </div>

                <div class="card-body">
                    {{-- ✅ Flash message --}}
                    @if(session('success'))
                        <div class="alert alert-success alert-dismissible fade show">
                            {{ session('success') }}
                            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
                        </div>
                    @endif

                    {{-- 🔍 Filters --}}
                    <form id="filterForm" class="row mb-4">
                        <div class="col-md-3">
                            <label for="batch_filter" class="form-label">Batch</label>
                            <select class="form-select" id="batch_filter" name="batch_id">
                                <option value="">All Batches</option>
                                @foreach($batches as $batch)
                                    <option value="{{ $batch->id }}" {{ request('batch_id') == $batch->id ? 'selected' : '' }}>
                                        {{ $batch->name }}
                                    </option>
                                @endforeach
                            </select>
                        </div>

                        <div class="col-md-3">
                            <label for="subject_filter" class="form-label">Subject</label>
                            <select class="form-select" id="subject_filter" name="subject_id">
                                <option value="">All Subjects</option>
                                @foreach($subjects as $subject)
                                    <option value="{{ $subject->id }}" {{ request('subject_id') == $subject->id ? 'selected' : '' }}>
                                        {{ $subject->code ?? '' }} {{ $subject->title }}
                                    </option>
                                @endforeach
                            </select>
                        </div>

                        <div class="col-md-2">
                            <label for="room_filter" class="form-label">Room</label>
                            <select class="form-select" id="room_filter" name="room_id">
                                <option value="">All Rooms</option>
                                @foreach($rooms as $room)
                                    <option value="{{ $room->id }}" {{ request('room_id') == $room->id ? 'selected' : '' }}>
                                        {{ $room->name }} {{ $room->number ? '(' . $room->number . ')' : '' }}
                                    </option>
                                @endforeach
                            </select>
                        </div>

                        <div class="col-md-2">
                            <label for="status_filter" class="form-label">Status</label>
                            <select class="form-select" id="status_filter" name="active">
                                <option value="all" {{ request('active') === 'all' ? 'selected' : '' }}>All</option>
                                <option value="1" {{ request('active') === '1' ? 'selected' : '' }}>Active</option>
                                <option value="0" {{ request('active') === '0' ? 'selected' : '' }}>Inactive</option>
                            </select>
                        </div>

                        <div class="col-md-2">
                            <label for="semester_filter" class="form-label">Semester</label>
                            <input type="text" class="form-control" id="semester_filter" name="semester"
                                   value="{{ request('semester') }}" placeholder="e.g. Fall 2025">
                        </div>

                        <div class="col-md-12 d-flex justify-content-end mt-3">
                            <button type="submit" class="btn btn-outline-primary me-2">
                                <i class="fas fa-filter"></i> Filter
                            </button>
                            <a href="{{ route('classes.index') }}" class="btn btn-outline-secondary" title="Reset Filters">
                                <i class="fas fa-undo"></i> Reset
                            </a>
                        </div>
                    </form>

                    {{-- 📋 Table --}}
                    <div class="table-responsive">
                        <table class="table table-bordered table-striped table-hover align-middle">
                            <thead class="table-dark text-center">
                                <tr>
                                    <th>#</th>
                                    <th>Batch</th>
                                    <th>Subject</th>
                                    <th>Teacher</th>
                                    <th>Room</th>
                                    <th>Semester</th>
                                    <th>Weekly Hours</th>
                                    <th>Status</th>
                                    <th>Actions</th>
                                </tr>
                            </thead>

                            <tbody>
                                @forelse($classes as $class)
                                    <tr class="text-center {{ $class->active ? '' : 'table-secondary text-muted' }}">
                                        <td>{{ $loop->iteration }}</td>
                                        <td>{{ $class->batch->name ?? '—' }}</td>
                                        <td>{{ $class->subject->title ?? '—' }}</td>
                                        <td>
                                            @if($class->teacher && $class->teacher->user)
                                                <strong>{{ $class->teacher->user->username }}</strong><br>
                                                <small class="text-muted">{{ $class->teacher->user->email }}</small>
                                            @else
                                                <span class="text-muted">Not Assigned</span>
                                            @endif
                                        </td>
                                        <td>
                                            {{ $class->room?->name ?? '—' }}
                                            @if($class->room && $class->room->number)
                                                <small class="text-muted d-block">({{ $class->room->number }})</small>
                                            @endif
                                        </td>
                                        <td>{{ $class->semester ?? '—' }}</td>
                                        <td>{{ $class->weekly_hours ?? 0 }} hrs/week</td>
                                        <td>
                                            <span class="badge bg-{{ $class->active ? 'success' : 'secondary' }}">
                                                {{ $class->active ? 'Active' : 'Inactive' }}
                                            </span>
                                        </td>
                                        <td>
                                            <div class="btn-group btn-group-sm" role="group">
                                                <a href="{{ route('classes.show', ['class' => $class->id]) }}"
                                                   class="btn btn-info" title="View">
                                                    <i class="fas fa-eye"></i>
                                                </a>
                                                <a href="{{ route('classes.edit', ['class' => $class->id]) }}"
                                                   class="btn btn-warning" title="Edit">
                                                    <i class="fas fa-edit"></i>
                                                </a>
                                                <form action="{{ route('classes.toggle-status', ['class' => $class->id]) }}"
                                                      method="POST" class="d-inline">
                                                    @csrf
                                                    <button type="submit"
                                                            class="btn btn-{{ $class->active ? 'secondary' : 'success' }}"
                                                            title="{{ $class->active ? 'Deactivate' : 'Activate' }}">
                                                        <i class="fas fa-{{ $class->active ? 'pause' : 'play' }}"></i>
                                                    </button>
                                                </form>
                                                <form action="{{ route('classes.destroy', ['class' => $class->id]) }}"
                                                      method="POST" class="d-inline delete-form">
                                                    @csrf
                                                    @method('DELETE')
                                                    <button type="submit" class="btn btn-danger" title="Delete">
                                                        <i class="fas fa-trash"></i>
                                                    </button>
                                                </form>
                                            </div>
                                        </td>
                                    </tr>
                                @empty
                                    <tr>
                                        <td colspan="9" class="text-center text-muted">
                                            No class assignments found.
                                        </td>
                                    </tr>
                                @endforelse
                            </tbody>
                        </table>
                    </div>

                    {{-- 📑 Pagination --}}
                    @if($classes->hasPages())
                        <div class="d-flex justify-content-between align-items-center mt-3">
                            <div>
                                Showing {{ $classes->firstItem() }} to {{ $classes->lastItem() }}
                                of {{ $classes->total() }} entries
                            </div>
                            <div>
                                {{ $classes->links() }}
                            </div>
                        </div>
                    @endif
                </div>
            </div>
        </div>
    </div>
</div>
@endsection

@push('scripts')
<script>
$(document).ready(function() {
    // 🔄 Auto-submit filters
    $('#batch_filter, #subject_filter, #status_filter, #room_filter').on('change', function() {
        $('#filterForm').submit();
    });

    // 🗑️ AJAX Delete Confirmation
    $('.delete-form').on('submit', function(e) {
        e.preventDefault();
        const form = $(this);

        if (confirm('Are you sure you want to delete this class?')) {
            $.ajax({
                url: form.attr('action'),
                type: 'POST',
                data: {
                    _token: form.find('input[name="_token"]').val(),
                    _method: 'DELETE'
                },
                success: function() {
                    form.closest('tr').fadeOut(300, function() {
                        $(this).remove();
                    });
                    showAlert('Class deleted successfully!', 'success');
                },
                error: function(xhr) {
                    let message = 'Error deleting class.';
                    if (xhr.responseJSON && xhr.responseJSON.message) {
                        message = xhr.responseJSON.message;
                    }
                    showAlert(message, 'error');
                }
            });
        }
    });

    function showAlert(message, type) {
        const alertClass = type === 'success' ? 'alert-success' : 'alert-danger';
        const alertHtml = `
            <div class="alert ${alertClass} alert-dismissible fade show mt-3" role="alert">
                ${message}
                <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
            </div>`;
        $('.card-body').prepend(alertHtml);
        setTimeout(() => $('.alert').alert('close'), 4000);
    }
});
</script>
@endpush