@extends('layouts.app')

@section('content')
<div class="container-fluid">
    <div class="row">
        <div class="col-md-8 offset-md-2">
            <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-edit me-2"></i> Edit Class Assignment
                    </h4>
                    <a href="{{ route('classes.show', ['class' => $class->id]) }}" class="btn btn-light btn-sm">
                        <i class="fas fa-eye"></i> View
                    </a>
                </div>

                <div class="card-body">
                    {{-- Validation Errors --}}
                    @if($errors->any())
                        <div class="alert alert-danger">
                            <ul class="mb-0">
                                @foreach($errors->all() as $error)
                                    <li>{{ $error }}</li>
                                @endforeach
                            </ul>
                        </div>
                    @endif

                    <form id="editClassForm"
                          action="{{ route('classes.update', ['class' => $class->id]) }}"
                          method="POST">
                        @csrf
                        @method('PUT')

                        {{-- Batch & Subject --}}
                        <div class="row">
                            <div class="col-md-6">
                                <div class="mb-3">
                                    <label for="batch_id" class="form-label">Batch *</label>
                                    <select class="form-select @error('batch_id') is-invalid @enderror"
                                            id="batch_id" name="batch_id" required>
                                        <option value="">Select Batch</option>
                                        @foreach($batches as $batch)
                                            <option value="{{ $batch->id }}"
                                                {{ old('batch_id', $class->batch_id) == $batch->id ? 'selected' : '' }}>
                                                {{ $batch->name }}
                                            </option>
                                        @endforeach
                                    </select>
                                    @error('batch_id') <div class="invalid-feedback">{{ $message }}</div> @enderror
                                    <div class="invalid-feedback" id="batchError"></div>
                                </div>
                            </div>

                            <div class="col-md-6">
                                <div class="mb-3">
                                    <label for="subject_id" class="form-label">Subject *</label>
                                    <select class="form-select @error('subject_id') is-invalid @enderror"
                                            id="subject_id" name="subject_id" required>
                                        <option value="">Select Subject</option>
                                        @foreach($subjects as $subject)
                                            <option value="{{ $subject->id }}"
                                                {{ old('subject_id', $class->subject_id) == $subject->id ? 'selected' : '' }}>
                                                {{ $subject->title }}
                                            </option>
                                        @endforeach
                                    </select>
                                    @error('subject_id') <div class="invalid-feedback">{{ $message }}</div> @enderror
                                    <div class="invalid-feedback" id="subjectError"></div>
                                </div>
                            </div>
                        </div>

                        {{-- Teacher & Room --}}
                        <div class="row">
                            <div class="col-md-6">
                                <div class="mb-3">
                                    <label for="teacher_id" class="form-label">Teacher</label>
                                    <select class="form-select @error('teacher_id') is-invalid @enderror"
                                            id="teacher_id" name="teacher_id">
                                        <option value="">Select Teacher</option>
                                        @foreach($teachers as $teacher)
                                            <option value="{{ $teacher->id }}"
                                                {{ old('teacher_id', $class->teacher_id) == $teacher->id ? 'selected' : '' }}>
                                                {{ $teacher->user->username ?? 'N/A' }}
                                                @if($teacher->user->email ?? false)
                                                    ({{ $teacher->user->email }})
                                                @endif
                                            </option>
                                        @endforeach
                                    </select>
                                    @error('teacher_id') <div class="invalid-feedback">{{ $message }}</div> @enderror
                                </div>
                            </div>

                            <div class="col-md-6">
                                <div class="mb-3">
                                    <label for="room_id" class="form-label">Room</label>
                                    <select class="form-select @error('room_id') is-invalid @enderror"
                                            id="room_id" name="room_id">
                                        <option value="">Select Room</option>
                                        @foreach($rooms as $room)
                                            <option value="{{ $room->id }}"
                                                {{ old('room_id', $class->room_id) == $room->id ? 'selected' : '' }}>
                                                {{ $room->name }} {{ $room->number ? '(' . $room->number . ')' : '' }}
                                            </option>
                                        @endforeach
                                    </select>
                                    @error('room_id') <div class="invalid-feedback">{{ $message }}</div> @enderror
                                </div>
                            </div>
                        </div>

                        {{-- Weekly Hours & Semester --}}
                        <div class="row">
                            <div class="col-md-6">
                                <div class="mb-3">
                                    <label for="weekly_hours" class="form-label">Weekly Hours *</label>
                                    <input type="number" class="form-control @error('weekly_hours') is-invalid @enderror"
                                           id="weekly_hours" name="weekly_hours"
                                           value="{{ old('weekly_hours', $class->weekly_hours) }}"
                                           min="1" max="40" required>
                                    @error('weekly_hours') <div class="invalid-feedback">{{ $message }}</div> @enderror
                                </div>
                            </div>

                            <div class="col-md-6">
                                <div class="mb-3">
                                    <label for="semester" class="form-label">Semester *</label>
                                    <input type="text" class="form-control @error('semester') is-invalid @enderror"
                                           id="semester" name="semester"
                                           value="{{ old('semester', $class->semester) }}"
                                           required maxlength="50">
                                    @error('semester') <div class="invalid-feedback">{{ $message }}</div> @enderror
                                </div>
                            </div>
                        </div>


{{-- Active Toggle --}}
                        <div class="mb-3">
                            <div class="form-check form-switch">
                                {{-- Hidden input always sends 0 --}}
                                <input type="hidden" name="active" value="0">
                                {{-- Checkbox with different name --}}
                                <input class="form-check-input @error('active') is-invalid @enderror"
                                    type="checkbox" id="active_checkbox" name="active_checkbox" value="1"
                                    {{ old('active', $class->active ?? false) ? 'checked' : '' }}
                                    onchange="document.getElementsByName('active')[0].value = this.checked ? '1' : '0'">
                                <label class="form-check-label" for="active_checkbox">Active Assignment</label>
                                @error('active') <div class="invalid-feedback">{{ $message }}</div> @enderror
                            </div>
                        </div>
                                                {{-- Submit --}}
                        <div class="d-flex justify-content-between">
                            <a href="{{ route('classes.index') }}" class="btn btn-secondary">
                                <i class="fas fa-arrow-left"></i> Cancel
                            </a>
                            <button type="submit" class="btn btn-primary" id="updateBtn">
                                <i class="fas fa-save"></i> Update Assignment
                            </button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>
@endsection

@push('scripts')
<script>
$(function() {
    $('#editClassForm').on('submit', function(e) {
        e.preventDefault();

        const updateBtn = $('#updateBtn');
        const originalText = updateBtn.html();

        updateBtn.prop('disabled', true).html('<i class="fas fa-spinner fa-spin"></i> Updating...');

        $('.is-invalid').removeClass('is-invalid');
        $('.invalid-feedback').text('');

        // Get form data
        const formData = $(this).serialize();

        // Add _method=PUT for Laravel
        const fullData = formData + '&_method=PUT';

        $.ajax({
            url: $(this).attr('action'),
            type: 'POST', // Important: Use POST for AJAX with Laravel
            data: fullData,
            headers: {
                'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
            },
            success: function(response) {
                // Handle successful response
                if (response.redirect) {
                    window.location.href = response.redirect;
                } else if (response.success) {
                    window.location.href = '{{ route("classes.index") }}';
                } else {
                    // If it's a regular redirect
                    window.location.href = '{{ route("classes.index") }}';
                }
            },
            error: function(xhr) {
                updateBtn.prop('disabled', false).html(originalText);

                if (xhr.status === 422) {
                    const errors = xhr.responseJSON.errors;
                    Object.keys(errors).forEach(field => {
                        const input = $(`[name="${field}"]`);
                        input.addClass('is-invalid');
                        // Try different selectors for error display
                        const errorDiv = $(`#${field}Error`);
                        if (errorDiv.length) {
                            errorDiv.text(errors[field][0]);
                        } else {
                            input.next('.invalid-feedback').text(errors[field][0]);
                        }
                    });
                    $('.is-invalid').first().focus();
                } else {
                    alert('Error updating class. Please try again. Status: ' + xhr.status);
                    console.error('AJAX Error:', xhr.responseText);
                }
            }
        });
    });
});
</script>
@endpush