@extends('layouts.app')

@section('title', 'Edit Topic')

@section('content')
    <div class="min-h-screen bg-gray-50 py-8">
        <div class="max-w-2xl mx-auto px-4 sm:px-6 lg:px-8">
            <!-- Header -->
            <div class="mb-8">
                <div class="flex items-center">
                    <a href="{{ url()->previous() }}"
                        class="inline-flex items-center text-sm font-medium text-gray-500 hover:text-gray-700 mr-4">
                        <svg class="w-4 h-4 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M10 19l-7-7m0 0l7-7m-7 7h18"></path>
                        </svg>
                        Back
                    </a>
                </div>
            </div>

            <div class="mb-8">
                <div class="flex items-center">
                    <div>
                        <h1 class="text-3xl font-bold text-gray-900">Edit Topic</h1>
                        <p class="mt-2 text-sm text-gray-600">Update the topic information and subject assignment</p>
                    </div>
                </div>
            </div>

            <!-- Form Card -->
            <div class="bg-white shadow-sm rounded-lg overflow-hidden">
                <div class="px-6 py-4 border-b border-gray-200 bg-gray-50">
                    <div class="flex items-center justify-between">
                        <div>
                            <h2 class="text-lg font-medium text-gray-900">Topic Details</h2>
                            <p class="mt-1 text-sm text-gray-500">Update the topic name and subject assignment</p>
                        </div>
                        <div class="flex items-center px-3 py-1 bg-blue-100 rounded-full">
                            <svg class="w-4 h-4 text-blue-600 mr-1" fill="none" stroke="currentColor"
                                viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                    d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z">
                                </path>
                            </svg>
                            <span class="text-sm font-medium text-blue-700">Editing</span>
                        </div>
                    </div>
                </div>

                <form action="{{ route('topics.update', $topic) }}" method="POST" class="p-6">
                    @csrf
                    @method('PUT')

                    <!-- Current Topic Information -->
                    <div class="mb-6 p-4 bg-gray-50 rounded-lg border border-gray-200">
                        <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
                            <div>
                                <p class="text-sm font-medium text-gray-500">Current Topic</p>
                                <p class="text-lg font-semibold text-gray-900 mt-1">{{ $topic->name }}</p>
                            </div>
                            <div>
                                <p class="text-sm font-medium text-gray-500">Current Subject</p>
                                <p class="text-lg font-semibold text-gray-900 mt-1">{{ $topic->subject->name }}</p>
                            </div>
                        </div>
                        <div class="mt-3 flex items-center text-sm text-gray-500">
                            <svg class="w-4 h-4 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                    d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z"></path>
                            </svg>
                            Created {{ $topic->created_at->diffForHumans() }}
                        </div>
                    </div>

                    <!-- Subject Selection -->
                    <div class="space-y-2 mb-6">
                        <label for="subject_id" class="block text-sm font-medium text-gray-700">
                            Change Subject <span class="text-red-500">*</span>
                        </label>
                        <div class="relative">
                            <select id="subject_id" name="subject_id"
                                class="block w-full px-4 py-3 border border-gray-300 rounded-lg shadow-sm focus:ring-2 focus:ring-blue-500 focus:border-blue-500 transition duration-150 ease-in-out @error('subject_id') border-red-300 focus:ring-red-500 focus:border-red-500 @enderror"
                                required>
                                <option value="">Select a subject</option>
                                @foreach ($subjects as $subject)
                                    <option value="{{ $subject->id }}"
                                        {{ old('subject_id', $topic->subject_id) == $subject->id ? 'selected' : '' }}>
                                        {{ $subject->name }}
                                    </option>
                                @endforeach
                            </select>
                            <div class="absolute inset-y-0 right-0 pr-3 flex items-center pointer-events-none">
                                <svg class="h-5 w-5 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                        d="M8 9l4-4 4 4m0 6l-4 4-4-4"></path>
                                </svg>
                            </div>
                        </div>

                        @error('subject_id')
                            <div class="flex items-center mt-1 text-sm text-red-600">
                                <svg class="w-4 h-4 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                        d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"></path>
                                </svg>
                                {{ $message }}
                            </div>
                        @enderror

                        <p class="text-xs text-gray-500 mt-1">
                            Choose which subject this topic should belong to
                        </p>
                    </div>

                    <!-- Topic Name -->
                    <div class="space-y-2">
                        <label for="name" class="block text-sm font-medium text-gray-700">
                            Topic Name <span class="text-red-500">*</span>
                        </label>
                        <div class="relative">
                            <input type="text" id="name" name="name" value="{{ old('name', $topic->name) }}"
                                placeholder="Enter updated topic name"
                                class="block w-full px-4 py-3 border border-gray-300 rounded-lg shadow-sm placeholder-gray-400 focus:ring-2 focus:ring-blue-500 focus:border-blue-500 transition duration-150 ease-in-out @error('name') border-red-300 focus:ring-red-500 focus:border-red-500 @enderror"
                                required autofocus>
                            <div class="absolute inset-y-0 right-0 pr-3 flex items-center pointer-events-none">
                                <svg class="h-5 w-5 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                        d="M7 8h10M7 12h4m1 8l-4-4H5a2 2 0 01-2-2V6a2 2 0 012-2h14a2 2 0 012 2v8a2 2 0 01-2 2h-3l-4 4z">
                                    </path>
                                </svg>
                            </div>
                        </div>

                        @error('name')
                            <div class="flex items-center mt-1 text-sm text-red-600">
                                <svg class="w-4 h-4 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                        d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"></path>
                                </svg>
                                {{ $message }}
                            </div>
                        @enderror

                        <p class="text-xs text-gray-500 mt-1">
                            Update the topic name as needed
                        </p>
                    </div>

                    <!-- Topic Status -->
                    <div class="space-y-2 mt-6">
                        <label for="status" class="block text-sm font-medium text-gray-700">
                            Topic Status <span class="text-red-500">*</span>
                        </label>
                        <div class="relative">
                            <select id="status" name="status"
                                class="block w-full px-4 py-3 border border-gray-300 rounded-lg shadow-sm focus:ring-2 focus:ring-blue-500 focus:border-blue-500 @error('status') border-red-300 focus:ring-red-500 focus:border-red-500 @enderror">
                                <option value="draft" {{ old('status', $topic->status) == 'draft' ? 'selected' : '' }}>
                                    Draft (Hidden)</option>
                                <option value="live" {{ old('status', $topic->status) == 'live' ? 'selected' : '' }}>
                                    Live (Visible to Students)</option>
                            </select>
                        </div>

                        @error('status')
                            <p class="text-sm text-red-600 mt-1">{{ $message }}</p>
                        @enderror

                        <p class="text-xs text-gray-500 mt-1">
                            Set the visibility of this topic. <strong>Live topics appear to students.</strong>
                        </p>
                    </div>

                    <!-- Change Indicator -->
                    <div id="changeIndicator" class="mt-6 p-4 bg-yellow-50 border border-yellow-200 rounded-lg hidden">
                        <div class="flex items-center">
                            <svg class="w-5 h-5 text-yellow-600 mr-3" fill="none" stroke="currentColor"
                                viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                    d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L4.35 16.5c-.77.833.192 2.5 1.732 2.5z">
                                </path>
                            </svg>
                            <div>
                                <p class="text-sm font-medium text-yellow-800">Changes detected</p>
                                <p class="text-sm text-yellow-700 mt-1" id="changesList"></p>
                            </div>
                        </div>
                    </div>

                    <!-- Selected Subject Preview -->
                    <div id="subjectPreview" class="mt-4 p-4 bg-blue-50 border border-blue-200 rounded-lg hidden">
                        <div class="flex items-center">
                            <svg class="w-5 h-5 text-blue-600 mr-3" fill="none" stroke="currentColor"
                                viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                    d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z">
                                </path>
                            </svg>
                            <div>
                                <p class="text-sm font-medium text-blue-800">New Subject Assignment</p>
                                <p id="selectedSubjectName" class="text-sm text-blue-600"></p>
                            </div>
                        </div>
                    </div>

                    <!-- Form Actions -->
                    <div
                        class="mt-8 pt-6 border-t border-gray-200 flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-3">
                        <a href="{{ url()->previous() }}"
                            class="mt-3 sm:mt-0 inline-flex justify-center items-center px-4 py-3 border border-gray-300 shadow-sm text-sm font-medium rounded-lg text-gray-700 bg-white hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 transition duration-150 ease-in-out">
                            <svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                    d="M6 18L18 6M6 6l12 12"></path>
                            </svg>
                            Cancel
                        </a>
                        <button type="submit" id="submitBtn"
                            class="inline-flex justify-center items-center px-6 py-3 border border-transparent text-sm font-medium rounded-lg shadow-sm text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 transition duration-150 ease-in-out">
                            <svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7">
                                </path>
                            </svg>
                            Update Topic
                        </button>
                    </div>
                </form>
            </div>

            <!-- Danger Zone -->
            <div class="mt-8 bg-white shadow-sm rounded-lg overflow-hidden border border-red-200">
                <div class="px-6 py-4 border-b border-red-200 bg-red-50">
                    <h2 class="text-lg font-medium text-red-900 flex items-center">
                        <svg class="w-5 h-5 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L4.35 16.5c-.77.833.192 2.5 1.732 2.5z">
                            </path>
                        </svg>
                        Danger Zone
                    </h2>
                </div>
                <div class="p-6">
                    <div class="flex flex-col sm:flex-row sm:items-center sm:justify-between">
                        <div class="mb-4 sm:mb-0">
                            <h3 class="text-sm font-medium text-red-800">Delete this topic</h3>
                            <p class="text-sm text-red-600 mt-1">Once deleted, this topic and all its associated data
                                cannot be recovered.</p>
                        </div>
                        <form action="{{ route('topics.destroy', $topic) }}" method="POST" class="inline">
                            @csrf
                            @method('DELETE')
                            <button type="button" onclick="confirmDelete()"
                                class="inline-flex items-center px-4 py-2 border border-transparent text-sm font-medium rounded-md text-white bg-red-600 hover:bg-red-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-red-500 transition duration-150 ease-in-out">
                                <svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                        d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16">
                                    </path>
                                </svg>
                                Delete
                            </button>
                        </form>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <!-- Delete Confirmation Modal -->
    <div id="deleteModal" class="fixed inset-0 bg-gray-600 bg-opacity-50 overflow-y-auto h-full w-full hidden z-50">
        <div class="relative top-20 mx-auto p-5 border w-96 shadow-lg rounded-md bg-white">
            <div class="mt-3 text-center">
                <div class="mx-auto flex items-center justify-center h-12 w-12 rounded-full bg-red-100">
                    <svg class="h-6 w-6 text-red-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                            d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L4.35 16.5c-.77.833.192 2.5 1.732 2.5z">
                        </path>
                    </svg>
                </div>
                <h3 class="text-lg leading-6 font-medium text-gray-900 mt-2">Delete Topic</h3>
                <div class="mt-2 px-7 py-3">
                    <p class="text-sm text-gray-500">
                        Are you sure you want to delete "<strong>{{ $topic->name }}</strong>"? This action cannot be
                        undone and all associated data will be permanently removed.
                    </p>
                </div>
                <div class="flex justify-center space-x-3 mt-4">
                    <button onclick="closeDeleteModal()"
                        class="px-4 py-2 bg-gray-300 text-gray-700 text-sm font-medium rounded-md hover:bg-gray-400 focus:outline-none focus:ring-2 focus:ring-gray-500">
                        Cancel
                    </button>
                    <form action="{{ route('topics.destroy', $topic) }}" method="POST" class="inline">
                        @csrf
                        @method('DELETE')
                        <button type="submit"
                            class="px-4 py-2 bg-red-600 text-white text-sm font-medium rounded-md hover:bg-red-700 focus:outline-none focus:ring-2 focus:ring-red-500">
                            Yes, Delete Topic
                        </button>
                    </form>
                </div>
            </div>
        </div>
    </div>

    <script>
        document.addEventListener('DOMContentLoaded', function() {
            const subjectSelect = document.getElementById('subject_id');
            const nameInput = document.getElementById('name');
            const changeIndicator = document.getElementById('changeIndicator');
            const changesList = document.getElementById('changesList');
            const subjectPreview = document.getElementById('subjectPreview');
            const selectedSubjectName = document.getElementById('selectedSubjectName');
            const submitBtn = document.getElementById('submitBtn');

            const originalSubjectId = "{{ $topic->subject_id }}";
            const originalName = "{{ $topic->name }}";
            const originalSubjectName = "{{ $topic->subject->name }}";

            function checkForChanges() {
                const currentSubjectId = subjectSelect.value;
                const currentName = nameInput.value;
                const changes = [];

                if (currentSubjectId !== originalSubjectId) {
                    changes.push('subject');
                }
                if (currentName !== originalName) {
                    changes.push('topic name');
                }

                if (changes.length > 0) {
                    changeIndicator.classList.remove('hidden');
                    changesList.textContent = `You've changed: ${changes.join(', ')}`;
                    submitBtn.innerHTML =
                        '<svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path></svg>Save Changes';
                } else {
                    changeIndicator.classList.add('hidden');
                    submitBtn.innerHTML =
                        '<svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path></svg>Update Topic';
                }
            }

            // Show selected subject preview when changed
            subjectSelect.addEventListener('change', function() {
                const selectedOption = this.options[this.selectedIndex];
                if (selectedOption.value && selectedOption.value !== originalSubjectId) {
                    selectedSubjectName.textContent = selectedOption.text;
                    subjectPreview.classList.remove('hidden');
                } else {
                    subjectPreview.classList.add('hidden');
                }
                checkForChanges();
            });

            // Check for changes on name input
            nameInput.addEventListener('input', checkForChanges);

            // Real-time validation for topic name
            nameInput.addEventListener('input', function() {
                const value = this.value;
                const isValid = value.length >= 2 && value.length <= 255;

                if (value.length > 0) {
                    if (isValid) {
                        this.classList.remove('border-red-300', 'focus:ring-red-500',
                            'focus:border-red-500');
                        this.classList.add('border-green-300', 'focus:ring-green-500',
                            'focus:border-green-500');
                    } else {
                        this.classList.remove('border-green-300', 'focus:ring-green-500',
                            'focus:border-green-500');
                        this.classList.add('border-red-300', 'focus:ring-red-500', 'focus:border-red-500');
                    }
                }
            });

            // Initialize check
            checkForChanges();
        });

        // Delete modal functions
        function confirmDelete() {
            document.getElementById('deleteModal').classList.remove('hidden');
        }

        function closeDeleteModal() {
            document.getElementById('deleteModal').classList.add('hidden');
        }

        // Close modal when clicking outside
        window.onclick = function(event) {
            const modal = document.getElementById('deleteModal');
            if (event.target === modal) {
                closeDeleteModal();
            }
        }
    </script>

    <style>
        /* Custom select styling */
        select {
            appearance: none;
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
            background-position: right 0.5rem center;
            background-repeat: no-repeat;
            background-size: 1.5em 1.5em;
            padding-right: 2.5rem;
        }

        select::-ms-expand {
            display: none;
        }

        .transition {
            transition: all 0.2s ease-in-out;
        }

        input:focus,
        select:focus {
            outline: none;
            ring: 2px;
        }
    </style>
@endsection