@extends('layouts.app')

@section('title', 'Add New 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">Add New Topic</h1>
                    <p class="mt-2 text-sm text-gray-600">Create a new topic and assign it to a subject</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">
                <h2 class="text-lg font-medium text-gray-900">Topic Information</h2>
                <p class="mt-1 text-sm text-gray-500">Fill in the details below to create a new topic</p>
            </div>

            <form action="{{ route('topics.store') }}" method="POST" class="p-6">
                @csrf

                <!-- Subject Selection -->
                <div class="space-y-2 mb-6">
                    <label for="subject_id" class="block text-sm font-medium text-gray-700">
                        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') == $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 belongs 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') }}"
                               placeholder="Enter topic name (e.g., Algebra, Cell Biology, World War II)"
                               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">
                        Choose a clear and descriptive name for the topic
                    </p>
                </div>

                <!-- Selected Subject Preview -->
                <div id="subjectPreview" class="mt-6 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">Selected Subject</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" 
                            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>
                        Create Topic
                    </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 topics</h3>
                    <div class="mt-2 text-sm text-blue-700">
                        <ul class="list-disc list-inside space-y-1">
                            <li>Choose the appropriate subject for better organization</li>
                            <li>Use specific and descriptive topic names</li>
                            <li>Consider the learning sequence when naming topics</li>
                            <li>Keep topic names concise but meaningful</li>
                        </ul>
                    </div>
                </div>
            </div>
        </div>

        <!-- Subjects Overview -->
        @if($subjects->count() > 0)
        <div class="mt-8">
            <h3 class="text-lg font-medium text-gray-900 mb-4">Available Subjects</h3>
            <div class="grid grid-cols-1 sm:grid-cols-2 gap-4">
                @foreach($subjects as $subject)
                    <div class="bg-white border border-gray-200 rounded-lg p-4 hover:border-blue-300 transition-colors duration-150">
                        <div class="flex items-center">
                            <div class="flex-shrink-0 h-10 w-10 bg-blue-100 rounded-lg flex items-center justify-center">
                                <svg class="h-6 w-6 text-blue-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 6.253v13m0-13C10.832 5.477 9.246 5 7.5 5S4.168 5.477 3 6.253v13C4.168 18.477 5.754 18 7.5 18s3.332.477 4.5 1.253m0-13C13.168 5.477 14.754 5 16.5 5c1.747 0 3.332.477 4.5 1.253v13C19.832 18.477 18.247 18 16.5 18c-1.746 0-3.332.477-4.5 1.253"></path>
                                </svg>
                            </div>
                            <div class="ml-4">
                                <h4 class="text-sm font-medium text-gray-900">{{ $subject->name }}</h4>
                                <p class="text-sm text-gray-500">{{ $subject->topics_count ?? 0 }} topics</p>
                            </div>
                        </div>
                    </div>
                @endforeach
            </div>
        </div>
        @endif
    </div>
</div>

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

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

    // Initialize preview if subject is already selected
    if (subjectSelect.value && subjectSelect.value !== '') {
        const selectedOption = subjectSelect.options[subjectSelect.selectedIndex];
        selectedSubjectName.textContent = selectedOption.text;
        subjectPreview.classList.remove('hidden');
    }

    // 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');
            }
        } else {
            this.classList.remove('border-red-300', 'border-green-300', 'focus:ring-red-500', 'focus:ring-green-500', 'focus:border-red-500', 'focus:border-green-500');
            this.classList.add('border-gray-300', 'focus:ring-blue-500', 'focus:border-blue-500');
        }
    });

    // Form submission enhancement
    const form = document.querySelector('form');
    form.addEventListener('submit', function(e) {
        const subjectValue = subjectSelect.value;
        const nameValue = nameInput.value.trim();
        
        if (!subjectValue || !nameValue) {
            e.preventDefault();
            if (!subjectValue) {
                subjectSelect.focus();
            } else {
                nameInput.focus();
            }
            return false;
        }
    });
});
</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;
}

/* Remove default arrow in IE */
select::-ms-expand {
    display: none;
}

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

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