@extends('layouts.app')

@section('content')
<div class="container-fluid">
    <div class="row">
        <div class="col-md-8 offset-md-2">
            <div class="card">
                <div class="card-header d-flex justify-content-between align-items-center">
                    <h4 class="mb-0">Edit Subject: {{ $subject->code }}</h4>
                    <a href="{{ route('subjects.show', $subject->id) }}" class="btn btn-info">
                        <i class="fas fa-eye"></i> View
                    </a>
                </div>
                <div class="card-body">
                    <form id="editSubjectForm" action="{{ route('subjects.update', $subject->id) }}" method="POST">
                        @csrf
                        @method('PUT')
                        
                        <div class="row">
                            <div class="col-md-6">
                                <div class="mb-3">
                                    <label for="code" class="form-label">Subject Code *</label>
                                    <input type="text" class="form-control" id="code" name="code" 
                                           value="{{ old('code', $subject->code) }}" required maxlength="50">
                                    <div class="invalid-feedback" id="codeError"></div>
                                </div>
                            </div>
                            <div class="col-md-6">
                                <div class="mb-3">
                                    <label for="credit_hours" class="form-label">Credit Hours *</label>
                                    <input type="number" class="form-control" id="credit_hours" name="credit_hours" 
                                           value="{{ old('credit_hours', $subject->credit_hours) }}" min="0" max="10" required>
                                    <div class="invalid-feedback" id="creditHoursError"></div>
                                </div>
                            </div>
                        </div>

                        <div class="mb-3">
                            <label for="title" class="form-label">Subject Title *</label>
                            <input type="text" class="form-control" id="title" name="title" 
                                   value="{{ old('title', $subject->title) }}" required maxlength="160">
                            <div class="invalid-feedback" id="titleError"></div>
                        </div>

                        <div class="mb-3">
                            <label for="description" class="form-label">Description</label>
                            <textarea class="form-control" id="description" name="description" 
                                      rows="4" maxlength="500">{{ old('description', $subject->description) }}</textarea>
                            <div class="form-text">Maximum 500 characters</div>
                            <div class="invalid-feedback" id="descriptionError"></div>
                        </div>

                        <div class="d-flex justify-content-between">
                            <a href="{{ route('subjects.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 Subject
                            </button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>
@endsection

@push('scripts')
<script>
$(document).ready(function() {
    $('#editSubjectForm').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('');
        
        $.ajax({
            url: $(this).attr('action'),
            type: 'POST',
            data: $(this).serialize(),
            success: function(response) {
                window.location.href = '{{ route("subjects.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}"]`);
                        const errorDiv = $(`#${field}Error`);
                        
                        input.addClass('is-invalid');
                        errorDiv.text(errors[field][0]);
                    });
                } else {
                    alert('Error updating subject. Please try again.');
                }
            }
        });
    });
});
</script>
@endpush