@extends('layouts.app')

@section('content')
<div class="container-fluid">
    <div class="row">
        <div class="col-md-12">
            <div class="card">
                <div class="card-header d-flex justify-content-between align-items-center">
                    <h4 class="mb-0">Subjects Management</h4>
                    <a href="{{ route('subjects.create') }}" class="btn btn-primary">
                        <i class="fas fa-plus"></i> Add New Subject
                    </a>
                </div>
                <div class="card-body">
                    @if(session('success'))
                        <div class="alert alert-success alert-dismissible fade show" role="alert">
                            {{ session('success') }}
                            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
                        </div>
                    @endif

                    @if(session('error'))
                        <div class="alert alert-danger alert-dismissible fade show" role="alert">
                            {{ session('error') }}
                            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
                        </div>
                    @endif

                    <!-- Search Form -->
                    <div class="row mb-3">
                        <div class="col-md-6">
                            <form id="searchForm">
                                <div class="input-group">
                                    <input type="text" name="search" class="form-control" placeholder="Search by code or title..." 
                                           value="{{ request('search') }}" id="searchInput">
                                    <button type="submit" class="btn btn-outline-primary">
                                        <i class="fas fa-search"></i> Search
                                    </button>
                                </div>
                            </form>
                        </div>
                    </div>

                    <!-- Subjects Table -->
                    <div class="table-responsive">
                        <table class="table table-bordered table-striped table-hover">
                            <thead class="table-dark">
                                <tr>
                                    <th>Code</th>
                                    <th>Title</th>
                                    <th>Credit Hours</th>
                                    <th>Description</th>
                                    <th>Actions</th>
                                </tr>
                            </thead>
                            <tbody id="subjectsTable">
                                @include('subjects.partials.subjects-table', ['subjects' => $subjects])
                            </tbody>
                        </table>
                    </div>

                    <!-- Pagination -->
                    <div class="d-flex justify-content-between align-items-center">
                        <div>
                            Showing {{ $subjects->firstItem() }} to {{ $subjects->lastItem() }} of {{ $subjects->total() }} entries
                        </div>
                        <div id="paginationLinks">
                            @include('subjects.partials.pagination', ['subjects' => $subjects])
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<!-- Delete Confirmation Modal -->
<div class="modal fade" id="deleteModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title">Confirm Delete</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <div class="modal-body">
                <p>Are you sure you want to delete subject "<span id="subjectName"></span>"?</p>
                <p class="text-danger">This action cannot be undone.</p>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
                <button type="button" class="btn btn-danger" id="confirmDelete">Delete</button>
            </div>
        </div>
    </div>
</div>
@endsection

@push('scripts')
<script>
$(document).ready(function() {
    let deleteSubjectId = null;

    // AJAX Search
    $('#searchForm').on('submit', function(e) {
        e.preventDefault();
        performSearch();
    });

    $('#searchInput').on('keyup', function() {
        if ($(this).val().length === 0 || $(this).val().length >= 3) {
            performSearch();
        }
    });

    function performSearch() {
        const searchTerm = $('#searchInput').val();
        
        $.ajax({
            url: '{{ route("subjects.index") }}',
            type: 'GET',
            data: { search: searchTerm },
            success: function(response) {
                $('#subjectsTable').html(response.table);
                $('#paginationLinks').html(response.pagination);
            },
            error: function(xhr) {
                alert('Error searching subjects');
            }
        });
    }

    // Delete Subject - FIXED
    $(document).on('click', '.delete-subject', function() {
        deleteSubjectId = $(this).data('id');
        const subjectName = $(this).data('name');
        
        $('#subjectName').text(subjectName);
        $('#deleteModal').modal('show');
    });

    $('#confirmDelete').on('click', function() {
        if (!deleteSubjectId) return;

        $.ajax({
            url: `/subjects/${deleteSubjectId}`,
            type: 'DELETE',
            data: {
                _token: '{{ csrf_token() }}'
            },
            success: function(response) {
                if (response.success) {
                    $('#subject-' + deleteSubjectId).remove();
                    $('#deleteModal').modal('hide');
                    showAlert('Subject deleted successfully!', 'success');
                    
                    // Reload the table if empty
                    if ($('#subjectsTable tr').length === 1) {
                        performSearch();
                    }
                } else {
                    alert('Failed to delete subject');
                }
            },
            error: function(xhr) {
                if (xhr.status === 500) {
                    alert('Server error: Could not delete subject');
                } else if (xhr.status === 404) {
                    alert('Subject not found');
                } else {
                    alert('Error deleting subject: ' + (xhr.responseJSON?.message || 'Unknown error'));
                }
            }
        });
    });

    function showAlert(message, type) {
        const alertClass = type === 'success' ? 'alert-success' : 'alert-danger';
        const alertHtml = `
            <div class="alert ${alertClass} alert-dismissible fade show" role="alert">
                ${message}
                <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
            </div>
        `;
        $('.card-body').prepend(alertHtml);
        
        setTimeout(() => {
            $('.alert').alert('close');
        }, 5000);
    }
});
</script>
@endpush