@extends('teacher.teacher_dashboard')

@section('admin')
<div class="content-body">
    <div class="container-fluid">
        <div class="row page-titles">
            <div class="col-md-9">
                <ol class="breadcrumb">
                    <li class="breadcrumb-item"><a href="javascript:void(0)">Home</a></li>
                    <li class="breadcrumb-item"><a href="{{ route('teacher.syllabus.index') }}">Syllabus</a></li>
                    <li class="breadcrumb-item active">Edit Syllabus</li>
                </ol>
            </div>
        </div>

        {{-- 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

        @if(session('error'))
            <div class="alert alert-danger">{{ session('error') }}</div>
        @endif

        <div class="row">
            <div class="col-12">
                <div class="card">
                    <div class="card-header">
                        <h4 class="card-title">Edit Syllabus Draft</h4>
                    </div>
                    <div class="card-body">
                        <form action="{{ route('teacher.syllabus.update', $syllabus->id) }}" method="POST">
                            @csrf
                            <div class="row">
                                <div class="mb-3 col-md-4">
                                    <label class="form-label">Academic Session <span class="text-danger">*</span></label>
                                    <select name="session_id" id="session_id" class="default-select form-control wide" required>
                                        <option value="">Select session...</option>
                                        @foreach ($session as $s)
                                            <option value="{{ $s->id }}" {{ (old('session_id', $syllabus->academic_session_id) == $s->id) ? 'selected' : '' }}>
                                                {{ $s->name }}
                                            </option>
                                        @endforeach
                                    </select>
                                    @error('session_id')
                                        <span class="text-danger">{{ $message }}</span>
                                    @enderror
                                </div>

                                <div class="mb-3 col-md-4">
                                    <label class="form-label">Class <span class="text-danger">*</span></label>
                                    <select name="class_id" id="class_id" class="default-select form-control wide" required>
                                        <option value="">Select class...</option>
                                        {{-- Will be loaded dynamically --}}
                                    </select>
                                    @error('class_id')
                                        <span class="text-danger">{{ $message }}</span>
                                    @enderror
                                </div>

                                <div class="mb-3 col-md-4">
                                    <label class="form-label">Subject <span class="text-danger">*</span></label>
                                    <select name="subject_id" id="subject_id" class="default-select form-control wide" required>
                                        <option value="">Select subject...</option>
                                        {{-- Will be loaded dynamically --}}
                                    </select>
                                    @error('subject_id')
                                        <span class="text-danger">{{ $message }}</span>
                                    @enderror
                                </div>

                                <div class="mb-3 col-md-4">
                                    <label class="form-label">Full Marks <span class="text-danger">*</span></label>
                                    <input type="number" name="full_marks" class="form-control" placeholder="Enter full marks" value="{{ old('full_marks', $syllabus->full_marks) }}" required>
                                    @error('full_marks')
                                        <span class="text-danger">{{ $message }}</span>
                                    @enderror
                                </div>

                                <div class="mb-3 col-md-12">
                                    <label class="form-label">Marks Distribution <span class="text-danger">*</span></label>
                                    @php
                                        $marksContent = old('marks_distribution', $syllabus->marks_distribution);
                                        // Remove backslash escaping first
                                        $marksContent = stripslashes($marksContent);
                                        // Decode unicode escape sequences (u09ac format without backslash)
                                        if (strpos($marksContent, 'u0') !== false) {
                                            $marksContent = preg_replace_callback('/u([0-9a-fA-F]{4})/', function ($match) {
                                                return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE');
                                            }, $marksContent);
                                        }
                                    @endphp
                                    <textarea id="marks_distribution_editor" name="marks_distribution" class="form-control" rows="4">{{ $marksContent }}</textarea>
                                    @error('marks_distribution')
                                        <span class="text-danger">{{ $message }}</span>
                                    @enderror
                                </div>

                                <div class="mb-3 col-md-12">
                                    <label class="form-label">Detailed Syllabus <span class="text-danger">*</span></label>
                                    @php
                                        $syllabusContent = old('detailed_syllabus', $syllabus->detailed_syllabus);
                                        // Remove backslash escaping first
                                        $syllabusContent = stripslashes($syllabusContent);
                                        // Decode unicode escape sequences (u09ac format without backslash)
                                        if (strpos($syllabusContent, 'u0') !== false) {
                                            $syllabusContent = preg_replace_callback('/u([0-9a-fA-F]{4})/', function ($match) {
                                                return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE');
                                            }, $syllabusContent);
                                        }
                                    @endphp
                                    <textarea id="detailed_syllabus_editor" name="detailed_syllabus" class="form-control" rows="8">{{ $syllabusContent }}</textarea>
                                    @error('detailed_syllabus')
                                        <span class="text-danger">{{ $message }}</span>
                                    @enderror
                                </div>
                            </div>

                            <div class="row" style="text-align: right;">
                                <div class="mb-3 col-md-12">
                                    <a href="{{ route('teacher.syllabus.show', $syllabus->id) }}" class="btn btn-secondary">
                                        <i class="fas fa-times"></i> Cancel
                                    </a>
                                    <button type="submit" class="btn btn-primary">
                                        <i class="fas fa-save"></i> Update Draft
                                    </button>
                                </div>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>
@endsection

@section('customjs')
    <!-- SunEditor -->
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/suneditor@latest/dist/css/suneditor.min.css">
    <script src="https://cdn.jsdelivr.net/npm/suneditor@latest/dist/suneditor.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/suneditor@latest/src/lang/en.js"></script>

    <!-- Light Lavender Theme -->
    <style>
        .sun-editor {
            background-color: #f8f4fb !important;
            border-radius: 8px;
        }
        .sun-editor .se-toolbar {
            background-color: #f1e6fa !important;
        }
    </style>

    <script>
        document.addEventListener("DOMContentLoaded", function () {

            const existingSessionId = "{{ $syllabus->academic_session_id }}";
            const existingClassId = "{{ $syllabus->class_id }}";
            const existingSubjectId = "{{ $syllabus->subject_id }}";

            // Load classes when Session changes
            document.getElementById('session_id').addEventListener('change', function(){
                loadClasses(this.value, null);
            });

            // Load subjects when Class changes
            document.getElementById('class_id').addEventListener('change', function(){
                const sessionId = document.getElementById('session_id').value;
                loadSubjects(sessionId, this.value, null);
            });

            // Function to load classes
            function loadClasses(sessionId, selectedClassId) {
                const classSelect = document.getElementById('class_id');
                const subjectSelect = document.getElementById('subject_id');
                
                classSelect.innerHTML = '<option value="">Select class...</option>';
                subjectSelect.innerHTML = '<option value="">Select subject...</option>';
                
                if (!sessionId) return;
                
                fetch("{{ route('teacher.syllabus.getClasses') }}", {
                    method: "POST",
                    headers: {
                        "Content-Type": "application/json",
                        "X-CSRF-TOKEN": document.querySelector('meta[name="csrf-token"]').content
                    },
                    body: JSON.stringify({ session_id: sessionId })
                })
                .then(res => res.json())
                .then(data => {
                    let options = '<option value="">Select class...</option>';
                    data.forEach(item => {
                        const selected = (selectedClassId && item.id == selectedClassId) ? 'selected' : '';
                        options += `<option value="${item.id}" ${selected}>${item.name}</option>`;
                    });
                    classSelect.innerHTML = options;
                    
                    // If we have a selected class, load subjects
                    if (selectedClassId) {
                        loadSubjects(sessionId, selectedClassId, existingSubjectId);
                    }
                })
                .catch(err => {
                    console.error('Error loading classes:', err);
                    classSelect.innerHTML = '<option value="">Error loading classes</option>';
                });
            }

            // Function to load subjects
            function loadSubjects(sessionId, classId, selectedSubjectId) {
                const subjectSelect = document.getElementById('subject_id');
                
                subjectSelect.innerHTML = '<option value="">Select subject...</option>';
                
                if (!sessionId || !classId) return;
                
                fetch("{{ route('teacher.syllabus.getSubjects') }}", {
                    method: "POST",
                    headers: {
                        "Content-Type": "application/json",
                        "X-CSRF-TOKEN": document.querySelector('meta[name="csrf-token"]').content
                    },
                    body: JSON.stringify({ 
                        session_id: sessionId,
                        class_id: classId 
                    })
                })
                .then(res => res.json())
                .then(data => {
                    let options = '<option value="">Select subject...</option>';
                    data.forEach(item => {
                        const selected = (selectedSubjectId && item.id == selectedSubjectId) ? 'selected' : '';
                        options += `<option value="${item.id}" ${selected}>${item.name}</option>`;
                    });
                    subjectSelect.innerHTML = options;
                })
                .catch(err => {
                    console.error('Error loading subjects:', err);
                    subjectSelect.innerHTML = '<option value="">Error loading subjects</option>';
                });
            }

            // Load existing data on page load
            if (existingSessionId) {
                loadClasses(existingSessionId, existingClassId);
            }

            // SunEditor for Marks Distribution
            const marksEditor = SUNEDITOR.create(document.getElementById('marks_distribution_editor'), {
                height: '200px',
                buttonList: [
                    ['undo', 'redo'],
                    ['font', 'fontSize'],
                    ['bold', 'italic', 'underline'],
                    ['fontColor', 'hiliteColor'],
                    ['align', 'list', 'lineHeight'],
                    ['table', 'link'],
                    ['removeFormat']
                ],
                lang: SUNEDITOR_LANG['en']
            });

            // SunEditor for Detailed Syllabus
            const syllabusEditor = SUNEDITOR.create(document.getElementById('detailed_syllabus_editor'), {
                height: '400px',
                buttonList: [
                    ['undo', 'redo'],
                    ['font', 'fontSize'],
                    ['bold', 'italic', 'underline', 'strike'],
                    ['fontColor', 'hiliteColor'],
                    ['align', 'list', 'lineHeight'],
                    ['table', 'link', 'image'],
                    ['fullScreen', 'showBlocks', 'codeView'],
                    ['preview', 'print']
                ],
                lang: SUNEDITOR_LANG['en']
            });

            // Sync SunEditor before submitting
            const syllabusForm = document.querySelector('form');
            syllabusForm.addEventListener('submit', function (e) {
                const marksHtml = marksEditor.getContents().trim();
                const syllabusHtml = syllabusEditor.getContents().trim();

                if (marksHtml === '' || marksHtml === '<p><br></p>') {
                    e.preventDefault();
                    alert('Please enter marks distribution.');
                    return;
                }

                if (syllabusHtml === '' || syllabusHtml === '<p><br></p>') {
                    e.preventDefault();
                    alert('Please enter detailed syllabus.');
                    return;
                }

                document.getElementById('marks_distribution_editor').value = marksHtml;
                document.getElementById('detailed_syllabus_editor').value = syllabusHtml;
            });
        });
    </script>
@endsection