@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-chalkboard-teacher me-2"></i> Teachers Management
                    </h4>
                    <a href="{{ route('teachers.create') }}" class="btn btn-light btn-sm">
                        <i class="fas fa-plus"></i> Add New Teacher
                    </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 --}}
                    <div class="row mb-4">
                        <div class="col-md-5">
                            <form id="searchForm" class="d-flex">
                                <input type="text" name="search" class="form-control me-2"
                                       placeholder="Search by username or email..."
                                       value="{{ request('search') }}">
                                <button type="submit" class="btn btn-outline-primary">
                                    <i class="fas fa-search"></i> Search
                                </button>
                            </form>
                        </div>

                        <div class="col-md-4">
                            <select class="form-select" id="departmentFilter">
                                <option value="">All Departments</option>
                                @foreach($departments ?? [] as $dept)
                                    <option value="{{ $dept }}" {{ request('department') == $dept ? 'selected' : '' }}>
                                        {{ $dept }}
                                    </option>
                                @endforeach
                            </select>
                        </div>

                        <div class="col-md-3">
                            <a href="{{ route('teachers.index') }}" class="btn btn-outline-secondary w-100">
                                <i class="fas fa-undo"></i> Reset
                            </a>
                        </div>
                    </div>

                    {{-- 📋 Teachers Table --}}
                    <div class="table-responsive">
                        <table class="table table-bordered table-striped table-hover align-middle">
                            <thead class="table-dark text-center">
                                <tr>
                                    <th>Employee Code</th>
                                    <th>Teacher</th>
                                    <th>Department</th>
                                    <th>Join Date</th>
                                    <th>Active Subjects</th>
                                    <th>Status</th>
                                    <th>Actions</th>
                                </tr>
                            </thead>
                            <tbody id="teachersTable">
                                @forelse($teachers as $teacher)
                                    <tr id="teacher-{{ $teacher->id }}" class="text-center">
                                        <td><strong>{{ $teacher->employee_code ?? '—' }}</strong></td>

                                        <td class="text-start">
                                            <div class="d-flex align-items-center">
                                                <div class="avatar-sm me-3">
                                                    <div class="avatar-title bg-primary rounded-circle text-white">
                                                        {{ strtoupper(substr($teacher->user->username ?? $teacher->user->name ?? 'U', 0, 1)) }}
                                                    </div>
                                                </div>
                                                <div>
                                                    <h6 class="mb-0">{{ $teacher->user->username ?? $teacher->user->name }}</h6>
                                                    <small class="text-muted">{{ $teacher->user->email ?? 'N/A' }}</small>
                                                </div>
                                            </div>
                                        </td>

                                        <td>
                                            @if($teacher->department)
                                                <span class="badge bg-info">{{ $teacher->department }}</span>
                                            @else
                                                <span class="text-muted">Not Set</span>
                                            @endif
                                        </td>

                                        <td>
                                            {{ $teacher->joined_at ? $teacher->joined_at->format('M d, Y') : '—' }}
                                        </td>

                                        <td>
                                            <span class="badge bg-primary">
                                                {{ $teacher->classes->where('active', true)->count() }} Classes
                                            </span>
                                        </td>

                                        <td>
                                            @if($teacher->user->is_active)
                                                <span class="badge bg-success">Active</span>
                                            @else
                                                <span class="badge bg-secondary">Inactive</span>
                                            @endif
                                        </td>

                                        <td>
                                            <div class="btn-group btn-group-sm" role="group">
                                                <a href="{{ route('teachers.show', $teacher->id) }}"
                                                   class="btn btn-info" title="View">
                                                    <i class="fas fa-eye"></i>
                                                </a>
                                                <a href="{{ route('teachers.edit', $teacher->id) }}"
                                                   class="btn btn-warning" title="Edit">
                                                    <i class="fas fa-edit"></i>
                                                </a>
                                                {{-- <a href="{{ route('teachers.classes', $teacher->id) }}"
                                                   class="btn btn-primary" title="View Classes">
                                                    <i class="fas fa-calendar-alt"></i>
                                                </a> --}}
                                                <button class="btn btn-danger delete-teacher"
                                                        data-id="{{ $teacher->id }}"
                                                        data-name="{{ $teacher->user->username ?? $teacher->user->username }}"
                                                        title="Delete">
                                                    <i class="fas fa-trash"></i>
                                                </button>
                                            </div>
                                        </td>
                                    </tr>
                                @empty
                                    <tr>
                                        <td colspan="7" class="text-center text-muted">No teachers found.</td>
                                    </tr>
                                @endforelse
                            </tbody>
                        </table>
                    </div>

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

{{-- 🗑 Delete Confirmation Modal --}}
<div class="modal fade" id="deleteModal" tabindex="-1" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header bg-danger text-white">
                <h5 class="modal-title"><i class="fas fa-exclamation-triangle me-2"></i> 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 teacher <strong><span id="teacherName"></span></strong>?</p>
                <p class="text-danger">This action cannot be undone and will remove all associated data.</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>
$(function() {
    let deleteTeacherId = null;

    /** --------------------------
     *  Search + Filter AJAX
     * -------------------------- */
    $('#searchForm').on('submit', function(e) {
        e.preventDefault();
        reloadTeachers();
    });

    $('#departmentFilter').on('change', function() {
        reloadTeachers();
    });

    function reloadTeachers() {
        const search = $('input[name="search"]').val();
        const department = $('#departmentFilter').val();

        $.ajax({
            url: '{{ route("teachers.index") }}',
            type: 'GET',
            data: { search, department },
            success: function(response) {
                const newRows = $(response).find('#teachersTable').html();
                const pagination = $(response).find('#paginationLinks').html();
                $('#teachersTable').html(newRows);
                $('#paginationLinks').html(pagination);
            },
            error: () => alert('Error loading teachers.')
        });
    }

    /** --------------------------
     *  Delete Teacher
     * -------------------------- */
    $('.delete-teacher').on('click', function() {
        deleteTeacherId = $(this).data('id');
        const teacherName = $(this).data('name');
        $('#teacherName').text(teacherName);
        $('#deleteModal').modal('show');
    });

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

        $.ajax({
            url: `/teachers/${deleteTeacherId}`,
            type: 'DELETE',
            data: { _token: '{{ csrf_token() }}' },
            success: function() {
                $(`#teacher-${deleteTeacherId}`).fadeOut(300, function() { $(this).remove(); });
                $('#deleteModal').modal('hide');
                showAlert('Teacher deleted successfully!', 'success');
            },
            error: function(xhr) {
                showAlert(xhr.responseJSON?.message || 'Error deleting teacher', 'danger');
                $('#deleteModal').modal('hide');
            }
        });
    });

    /** --------------------------
     *  Flash alert helper
     * -------------------------- */
    function showAlert(message, type) {
        const html = `
            <div class="alert alert-${type} alert-dismissible fade show mt-3" role="alert">
                ${message}
                <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
            </div>`;
        $('.card-body').prepend(html);
        setTimeout(() => $('.alert').alert('close'), 4000);
    }

    /** --------------------------
     *  Load Department Options
     * -------------------------- */
    $.get('{{ route("ajax.teacher-departments") }}', function(response) {
        const departments = response.data;
        let options = '<option value="">All Departments</option>';
        departments.forEach(dept => {
            const selected = '{{ request("department") }}' === dept ? 'selected' : '';
            options += `<option value="${dept}" ${selected}>${dept}</option>`;
        });
        $('#departmentFilter').html(options);
    });
});
</script>

<style>
.avatar-sm {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1rem;
}
.avatar-title {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}
</style>
@endpush