@extends('layouts.app')

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

@section('content')
<div class="min-h-screen bg-gray-50 py-8">
    <div class="max-w-4xl 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 to questions
                </a>
            </div>
        </div>

        <div class="mb-8">
            <div class="flex items-center">
                <div>
                    <h1 class="text-3xl font-bold text-gray-900">Edit question</h1>
                    <p class="mt-2 text-sm text-gray-600">Update the question question, options, and correct answer</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">question Details</h2>
                        <p class="mt-1 text-sm text-gray-500">Update the question content and configuration</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('questions.update', $question) }}" method="POST" class="p-6">
                @csrf
                @method('PUT')

                <!-- Current question Info -->
                <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">{{ $question->topic->name }}</p>
                            <p class="text-sm text-gray-600">{{ $question->topic->subject->name }}</p>
                        </div>
                        <div>
                            <p class="text-sm font-medium text-gray-500">Question Preview</p>
                            <p class="text-sm text-gray-900 mt-1 line-clamp-2">{{ $question->question }}</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 {{ $question->created_at->diffForHumans() }}
                    </div>
                </div>

                <!-- Topic Selection -->
                <div class="space-y-2 mb-6">
                    <label for="topic_id" class="block text-sm font-medium text-gray-700">
                        Topic <span class="text-red-500">*</span>
                    </label>
                    <div class="relative">
                        <select id="topic_id" 
                                name="topic_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('topic_id') border-red-300 focus:ring-red-500 focus:border-red-500 @enderror"
                                required>
                            <option value="">Select a topic</option>
                            @foreach($topics as $topic)
                                <option value="{{ $topic->id }}" {{ old('topic_id', $question->topic_id) == $topic->id ? 'selected' : '' }}>
                                    {{ $topic->subject->name }} → {{ $topic->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('topic_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 the topic this question question belongs to
                    </p>
                </div>

                <!-- Question -->
                <div class="space-y-2 mb-6">
                    <label for="question" class="block text-sm font-medium text-gray-700">
                        Question <span class="text-red-500">*</span>
                    </label>
                    <div class="relative">
                        <textarea id="question" 
                                  name="question" 
                                  rows="4"
                                  placeholder="Enter the question question..."
                                  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('question') border-red-300 focus:ring-red-500 focus:border-red-500 @enderror"
                                  required>{{ old('question', $question->question) }}</textarea>
                        <div class="absolute bottom-3 right-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="M8.228 9c.549-1.165 2.03-2 3.772-2 2.21 0 4 1.343 4 3 0 1.4-1.278 2.575-3.006 2.907-.542.104-.994.54-.994 1.093m0 3h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"></path>
                            </svg>
                        </div>
                    </div>
                    
                    @error('question')
                        <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">
                        Write a clear and concise question for the question
                    </p>
                </div>

                <!-- Options Section -->
                <div class="mb-6">
                    <div class="flex items-center justify-between mb-4">
                        <h3 class="text-lg font-medium text-gray-900">Answer Options</h3>
                        <span class="text-sm text-gray-500 bg-gray-100 px-2 py-1 rounded">Select one correct answer</span>
                    </div>

                    <div class="space-y-4">
                        @foreach($question->options as $index => $option)
                        <div class="option-card p-4 border border-gray-200 rounded-lg hover:border-blue-300 transition-colors duration-150 {{ $option->is_correct ? 'bg-green-50 border-green-200' : '' }}">
                            <div class="flex items-start space-x-4">
                                <!-- Option Number -->
                                <div class="flex-shrink-0">
                                    <div class="h-8 w-8 rounded-full bg-blue-100 flex items-center justify-center {{ $option->is_correct ? 'bg-green-100' : '' }}">
                                        <span class="text-sm font-medium {{ $option->is_correct ? 'text-green-700' : 'text-blue-700' }}">
                                            {{ $index + 1 }}
                                        </span>
                                    </div>
                                </div>
                                
                                <!-- Option Input -->
                                <div class="flex-1">
                                    <label class="block text-sm font-medium text-gray-700 mb-2">
                                        Option {{ $index + 1 }}
                                    </label>
                                    <input type="text" 
                                           name="options[{{ $index }}][text]" 
                                           value="{{ old("options.$index.text", $option->option_text) }}"
                                           placeholder="Enter option text..."
                                           class="block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:ring-2 focus:ring-blue-500 focus:border-blue-500 transition duration-150 ease-in-out"
                                           required>
                                </div>
                                
                                <!-- Correct Option Radio -->
                                <div class="flex-shrink-0">
                                    <div class="flex items-center h-14">
                                        <label class="flex items-center cursor-pointer">
                                            <input type="radio" 
                                                   name="correct_option" 
                                                   value="{{ $index }}"
                                                   {{ $option->is_correct ? 'checked' : '' }}
                                                   class="h-4 w-4 text-blue-600 focus:ring-blue-500 border-gray-300">
                                            <span class="ml-2 text-sm font-medium text-gray-700">
                                                Correct
                                            </span>
                                        </label>
                                    </div>
                                </div>
                            </div>
                            
                            <!-- Correct Answer Badge -->
                            @if($option->is_correct)
                            <div class="mt-2 flex items-center text-green-600 text-sm">
                                <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="M5 13l4 4L19 7"></path>
                                </svg>
                                Currently marked as correct answer
                            </div>
                            @endif
                        </div>
                        @endforeach
                    </div>
                    
                    @error('correct_option')
                        <div class="flex items-center mt-3 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
                </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>

                <!-- 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 question
                    </button>
                </div>
            </form>
        </div>

        <!-- Help Section -->
        <div class="mt-8 bg-blue-50 rounded-lg p-6">
            <div class="flex">
                <div class="flex-shrink-0">
                    <svg class="h-5 w-5 text-blue-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"></path>
                    </svg>
                </div>
                <div class="ml-3">
                    <h3 class="text-sm font-medium text-blue-800">Tips for creating effective questions</h3>
                    <div class="mt-2 text-sm text-blue-700">
                        <ul class="list-disc list-inside space-y-1">
                            <li>Ensure questions are clear and unambiguous</li>
                            <li>Make sure only one correct answer is selected</li>
                            <li>Use plausible distractors for wrong options</li>
                            <li>Keep option lengths similar to avoid giving hints</li>
                        </ul>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<script>
document.addEventListener('DOMContentLoaded', function() {
    const topicSelect = document.getElementById('topic_id');
    const questionTextarea = document.getElementById('question');
    const optionInputs = document.querySelectorAll('input[name^="options"]');
    const correctOptionRadios = document.querySelectorAll('input[name="correct_option"]');
    const changeIndicator = document.getElementById('changeIndicator');
    const changesList = document.getElementById('changesList');
    const submitBtn = document.getElementById('submitBtn');

    const originalTopicId = "{{ $question->topic_id }}";
    const originalQuestion = `{{ $question->question }}`;
    const originalOptions = JSON.parse(`{!! addslashes(json_encode($question->options->pluck('option_text'))) !!}`);
    const originalCorrectOption = "{{ $question->options->search(function($option) { return $option->is_correct; }) }}";

    function checkForChanges() {
        const currentTopicId = topicSelect.value;
        const currentQuestion = questionTextarea.value;
        const changes = [];

        // Check topic change
        if (currentTopicId !== originalTopicId) {
            changes.push('topic');
        }

        // Check question change
        if (currentQuestion !== originalQuestion) {
            changes.push('question');
        }

        // Check options changes
        let optionsChanged = false;
        optionInputs.forEach((input, index) => {
            if (input.value !== originalOptions[index]) {
                optionsChanged = true;
            }
        });
        if (optionsChanged) {
            changes.push('options');
        }

        // Check correct option change
        let currentCorrectOption = null;
        correctOptionRadios.forEach(radio => {
            if (radio.checked) {
                currentCorrectOption = radio.value;
            }
        });
        if (currentCorrectOption !== originalCorrectOption) {
            changes.push('correct answer');
        }

        // Update UI
        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';
            
            // Update option card styles based on current selection
            updateOptionCards();
        } 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 question';
        }
    }

    function updateOptionCards() {
        const optionCards = document.querySelectorAll('.option-card');
        optionCards.forEach((card, index) => {
            const radio = card.querySelector('input[type="radio"]');
            if (radio.checked) {
                card.classList.add('bg-green-50', 'border-green-200');
                card.classList.remove('bg-white', 'border-gray-200');
            } else {
                card.classList.remove('bg-green-50', 'border-green-200');
                card.classList.add('bg-white', 'border-gray-200');
            }
        });
    }

    // Event listeners
    topicSelect.addEventListener('change', checkForChanges);
    questionTextarea.addEventListener('input', checkForChanges);
    optionInputs.forEach(input => input.addEventListener('input', checkForChanges));
    correctOptionRadios.forEach(radio => radio.addEventListener('change', checkForChanges));

    // Real-time validation for question
    questionTextarea.addEventListener('input', function() {
        const value = this.value;
        if (value.length > 0) {
            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');
        }
    });

    // Initialize
    checkForChanges();
    updateOptionCards();
});
</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;
}

/* Smooth transitions */
.transition {
    transition: all 0.2s ease-in-out;
}

/* Custom focus styles */
input:focus, select:focus, textarea:focus {
    outline: none;
    ring: 2px;
}

/* Line clamp utility */
.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Option card hover effects */
.option-card {
    transition: all 0.2s ease-in-out;
}
</style>
@endsection