@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">
                    <h4 class="mb-0">
                        <i class="fas fa-plus-circle me-2"></i> Create Batch Subject Assignment
                    </h4>
                </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="createClassModelForm" action="{{ route('classes.store') }}" method="POST">
                        @csrf

                        {{-- Batch and 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') == $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') == $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 and 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') == $teacher->id ? 'selected' : '' }}>
                                                {{ $teacher->user->username }} ({{ $teacher->user->email }})
                                            </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') == $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" min="1" max="40"
                                           class="form-control @error('weekly_hours') is-invalid @enderror"
                                           id="weekly_hours" name="weekly_hours"
                                           value="{{ old('weekly_hours', 3) }}" required>
                                    @error('weekly_hours') <div class="invalid-feedback">{{ $message }}</div> @enderror
                                    <div class="invalid-feedback" id="weeklyHoursError"></div>
                                </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', 'Fall 2024') }}"
                                           placeholder="e.g., Fall 2024, Spring 2025"
                                           maxlength="50" required>
                                    @error('semester') <div class="invalid-feedback">{{ $message }}</div> @enderror
                                    <div class="invalid-feedback" id="semesterError"></div>
                                    <small class="text-muted">Enter the semester name (e.g., Fall 2024, Spring 2025)</small>
                                </div>
                            </div>
                        </div>

                        {{-- Active toggle --}}
                        <div class="mb-3">
                            <div class="form-check form-switch">
                                <input class="form-check-input @error('active') is-invalid @enderror" type="checkbox"
                                       id="active" name="active" value="1"
                                       {{ old('active', true) ? 'checked' : '' }}>
                                <label class="form-check-label" for="active">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> Back to List
                            </a>
                            <button type="submit" class="btn btn-primary" id="submitBtn">
                                <i class="fas fa-save"></i> Create Assignment
                            </button>
                        </div>
                    </form>
                </div>
            </div>

            {{-- Optional: Existing batch-subject list for reference --}}
            @if(isset($batchSubjects) && $batchSubjects->count())
                <div class="card mt-4">
                    <div class="card-header bg-light">
                        <strong>Existing Assignments</strong>
                    </div>
                    <div class="card-body p-0">
                        <table class="table table-sm table-striped mb-0">
                            <thead class="table-secondary text-center">
                                <tr>
                                    <th>#</th>
                                    <th>Batch</th>
                                    <th>Subject</th>
                                    <th>Semester</th>
                                </tr>
                            </thead>
                            <tbody>
                                @foreach($batchSubjects as $bs)
                                    <tr class="text-center">
                                        <td>{{ $loop->iteration }}</td>
                                        <td>{{ $bs->batch->name ?? '-' }}</td>
                                        <td>{{ $bs->subject->title ?? '-' }}</td>
                                        <td>{{ $bs->semester ?? 'Not Set' }}</td>
                                    </tr>
                                @endforeach
                            </tbody>
                        </table>
                    </div>
                </div>
            @endif
        </div>
    </div>
</div>
@endsection

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

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

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

        // Clear previous errors
        $('.is-invalid').removeClass('is-invalid');
        $('.invalid-feedback').text('');
        $('.alert-danger').remove();

        // Use FormData to ensure ALL form fields are captured
        const formData = new FormData(this);

        // Debug: Log all form data to console
        console.log('=== FORM DATA DEBUG ===');
        console.log('Semester field value before submit:', $('#semester').val());
        console.log('Semester field trimmed:', $('#semester').val().trim());

        for (let [key, value] of formData.entries()) {
            console.log(key + ': ' + value);
        }
        console.log('=== END DEBUG ===');

        $.ajax({
            url: $(this).attr('action'),
            type: 'POST',
            data: formData,
            processData: false, // Important: Don't process the data
            contentType: false, // Important: Don't set content type
            headers: {
                'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
            },
            success: function (response) {
                console.log('Success response:', response);
                if (response.success && response.redirect) {
                    window.location.href = response.redirect;
                } else {
                    window.location.href = '{{ route("classes.index") }}';
                }
            },
            error: function (xhr) {
                submitBtn.prop('disabled', false).html(originalText);
                console.log('Error response:', xhr);

                if (xhr.status === 422) {
                    const errors = xhr.responseJSON.errors;
                    console.log('Validation errors:', errors);

                    // Show error alert at top
                    let errorHtml = '<ul class="mb-0">';
                    Object.keys(errors).forEach(field => {
                        errors[field].forEach(message => {
                            errorHtml += `<li>${message}</li>`;
                        });
                    });
                    errorHtml += '</ul>';

                    $('.card-body').prepend('<div class="alert alert-danger">' + errorHtml + '</div>');

                    // Highlight individual fields
                    Object.keys(errors).forEach(field => {
                        const input = $(`[name="${field}"]`);
                        input.addClass('is-invalid');

                        // Try to find error display element
                        const errorDiv = $(`#${field}Error`);
                        if (errorDiv.length) {
                            errorDiv.text(errors[field][0]);
                        } else {
                            // Fallback to next invalid-feedback
                            input.next('.invalid-feedback').text(errors[field][0]);
                        }
                    });

                    // Scroll to first error
                    $('html, body').animate({
                        scrollTop: $('.is-invalid').first().offset().top - 100
                    }, 500);
                } else {
                    let errorMessage = 'Error creating assignment.';
                    if (xhr.responseJSON && xhr.responseJSON.message) {
                        errorMessage += ' ' + xhr.responseJSON.message;
                    }
                    alert(errorMessage);
                    console.error('AJAX Error:', xhr.responseText);
                }
            }
        });
    });

    // Debug: Monitor semester field changes
    $('#semester').on('input change blur', function() {
        console.log('Semester field updated:', $(this).val());
    });
});
</script>
@endpush