@extends('admin.layouts.app')

@section('title', 'Edit Product')
@section('page-title', 'Edit Product')

@section('content')
<div class="bg-white dark:bg-gray-950 border border-gray-200 dark:border-gray-800 rounded-lg p-6">
    <div class="mb-6 pb-4 border-b border-gray-200 dark:border-gray-800">
        <h3 class="text-lg font-semibold text-gray-900 dark:text-white mb-1">Edit Product</h3>
        <p class="text-sm text-gray-500 dark:text-gray-400">Update the product information below</p>
    </div>
    
    <form method="POST" action="{{ route('admin.products.update', $product) }}" enctype="multipart/form-data">
        @csrf
        @method('PUT')

        <div class="grid grid-cols-1 md:grid-cols-2 gap-4 md:gap-6">
            <div>
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Product Name <span class="text-red-500">*</span></label>
                <input type="text" name="name" value="{{ old('name', $product->name) }}" required
                       class="w-full px-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">
            </div>

            <div>
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Product Name (Khmer)</label>
                <input type="text" name="name_km" value="{{ old('name_km', $product->name_km) }}"
                       class="w-full px-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">
            </div>

            <div>
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Price <span class="text-red-500">*</span></label>
                <div class="relative">
                    <span class="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-500 dark:text-gray-400 text-sm">$</span>
                    <input type="number" step="0.01" name="price" value="{{ old('price', $product->price) }}" required
                           class="w-full pl-8 pr-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">
                </div>
            </div>

            <div>
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Original Price</label>
                <div class="relative">
                    <span class="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-500 dark:text-gray-400 text-sm">$</span>
                    <input type="number" step="0.01" name="original_price" value="{{ old('original_price', $product->original_price) }}"
                           class="w-full pl-8 pr-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">
                </div>
            </div>

            <div class="md:col-span-2">
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Category / Subcategory</label>
                <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
                    <div>
                        <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Category</label>
                        <select id="main_category" name="main_category_id" class="w-full px-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">
                            <option value="">Select Category</option>
                            @foreach($categories as $category)
                                <option value="{{ $category->id }}" 
                                        data-subcategories='@json($category->subcategories)'
                                        {{ old('main_category_id') == $category->id || ($product->categoryRelation && $product->categoryRelation->parent_id === null && $product->categoryRelation->id == $category->id) || ($product->categoryRelation && $product->categoryRelation->parent_id == $category->id) ? 'selected' : '' }}>
                                    {{ $category->name }}
                                </option>
                            @endforeach
                        </select>
                    </div>
                    <div>
                        <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Subcategory <span class="text-gray-400 dark:text-gray-600 text-xs">(Optional)</span></label>
                        <select id="subcategory" class="w-full px-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent" {{ ($product->categoryRelation && $product->categoryRelation->parent_id) ? '' : 'disabled' }}>
                            <option value="">Select Subcategory</option>
                            @if($product->categoryRelation && $product->categoryRelation->parent_id)
                                @foreach($categories as $category)
                                    @if($category->id == $product->categoryRelation->parent_id)
                                        @foreach($category->subcategories as $subcategory)
                                            <option value="{{ $subcategory->id }}" {{ old('category_id', $product->category_id) == $subcategory->id ? 'selected' : '' }}>
                                                {{ $subcategory->name }}
                                            </option>
                                        @endforeach
                                    @endif
                                @endforeach
                            @endif
                        </select>
                        <p class="text-xs text-gray-500 dark:text-gray-400 mt-1">
                            Select a category first to see subcategories
                        </p>
                    </div>
                </div>
                <input type="hidden" id="final_category_id" name="category_id" value="{{ old('category_id', $product->category_id) }}">

            <div>
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Category Code (Legacy)</label>
                <input type="text" name="category" value="{{ old('category', $product->category) }}"
                       class="w-full px-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">
            </div>

            <div class="md:col-span-2">
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Description</label>
                <textarea name="description" rows="4"
                          class="w-full px-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">{{ old('description', $product->description) }}</textarea>
            </div>

            <div class="md:col-span-2">
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Description (Khmer)</label>
                <textarea name="description_km" rows="4"
                          class="w-full px-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">{{ old('description_km', $product->description_km) }}</textarea>
            </div>

            <div>
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Short Description</label>
                <input type="text" name="short_description" value="{{ old('short_description', $product->short_description) }}"
                       class="w-full px-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">
            </div>

            <div>
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Short Description (Khmer)</label>
                <input type="text" name="short_description_km" value="{{ old('short_description_km', $product->short_description_km) }}"
                       class="w-full px-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">
            </div>

            <div>
                <label class="flex items-center cursor-pointer">
                    <input type="checkbox" name="in_stock" value="1" {{ old('in_stock', $product->in_stock) ? 'checked' : '' }} 
                           class="w-4 h-4 text-blue-600 bg-white dark:bg-gray-800 border-gray-300 dark:border-gray-700 rounded focus:ring-blue-500 dark:focus:ring-blue-400">
                    <span class="ml-3 text-sm font-medium text-gray-700 dark:text-gray-300">In Stock</span>
                </label>
            </div>

            <div>
                <label class="flex items-center cursor-pointer">
                    <input type="checkbox" name="on_sale" value="1" {{ old('on_sale', $product->on_sale) ? 'checked' : '' }} 
                           class="w-4 h-4 text-blue-600 bg-white dark:bg-gray-800 border-gray-300 dark:border-gray-700 rounded focus:ring-blue-500 dark:focus:ring-blue-400">
                    <span class="ml-3 text-sm font-medium text-gray-700 dark:text-gray-300">On Sale</span>
                </label>
            </div>

            <div>
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Rating</label>
                <input type="number" step="0.1" min="0" max="5" name="rating" value="{{ old('rating', $product->rating) }}"
                       class="w-full px-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">
            </div>

            <div>
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Reviews</label>
                <input type="number" min="0" name="reviews" value="{{ old('reviews', $product->reviews) }}"
                       class="w-full px-3 py-2 bg-white dark:bg-gray-900 border border-gray-200 dark:border-gray-800 rounded-lg text-sm text-gray-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500 dark:focus:ring-blue-400 focus:border-transparent">
            </div>

            <div class="md:col-span-2">
                <label class="block text-gray-700 text-sm font-semibold mb-2">
                    Product Images
                </label>
                        <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Gallery Images</label>
                        <input type="file" name="image_gallery_upload[]" id="image_gallery_upload" accept="image/*" multiple
                               class="block w-full text-sm text-gray-500 file:mr-4 file:py-2 file:px-4 file:rounded-lg file:border-0 file:text-sm file:font-semibold file:bg-blue-50 file:text-blue-700 hover:file:bg-blue-100 cursor-pointer"
                               onchange="previewGalleryImages(this)">
                        <div id="gallery_existing_preview" class="grid grid-cols-2 md:grid-cols-4 gap-4 mt-4">
                            @foreach($product->gallery_images as $index => $image)
                                @php $realIndex = $index + 1; @endphp
                                <div class="relative group" id="existing_image_container_{{ $realIndex }}">
                                    <img src="{{ $image }}" alt="Gallery {{ $realIndex }}" class="w-full h-32 object-cover rounded-lg border-2 border-gray-200 shadow-md">
                                    <button type="button" onclick="removeExistingImage({{ $realIndex }})"
                                            class="absolute -top-2 -right-2 bg-red-500 text-white rounded-full w-7 h-7 flex items-center justify-center text-xs hover:bg-red-600 shadow-lg transition-colors">
                                        <i class="fas fa-times"></i>
                                    </button>
                                    <input type="hidden" name="images[]" value="{{ $image }}" id="existing_image_{{ $realIndex }}">
                                </div>
                            @endforeach
                        </div>

                        <div id="gallery_new_preview" class="grid grid-cols-2 md:grid-cols-4 gap-4 mt-4"></div>
                    </div>
                </div>
            </div>
        </div>

        <div class="mt-8 flex flex-col sm:flex-row items-stretch sm:items-center justify-end gap-3 pt-6 border-t border-gray-200 dark:border-gray-800">
            <a href="{{ route('admin.products.index') }}" 
               class="px-4 md:px-6 py-2.5 md:py-3 bg-gray-100 dark:bg-gray-800 hover:bg-gray-200 dark:hover:bg-gray-700 text-gray-700 dark:text-gray-300 font-semibold rounded-lg transition-colors text-center">
                <i class="fas fa-times mr-2"></i>Cancel
            </a>
            <button type="submit" 
                    class="btn-primary text-white font-semibold py-2.5 md:py-3 px-6 md:px-8 rounded-lg shadow-lg hover:shadow-xl transition-all duration-200">
                <i class="fas fa-save mr-2"></i>Update Product
            </button>
        </div>
    </form>
</div>

<script>
let selectedGalleryImages = [];

function previewFeaturedImage(input) {
    const file = input.files && input.files[0] ? input.files[0] : null;
    if (!file || !file.type.startsWith('image/')) {
        return;
    }

    const reader = new FileReader();
    reader.onload = function(e) {
        document.getElementById('featured_preview_img').src = e.target.result;
        document.getElementById('featured_preview').classList.remove('hidden');
    };
    reader.readAsDataURL(file);
}

function clearFeaturedPreview() {
    const input = document.getElementById('image_profile_upload');
    input.value = '';
    document.getElementById('featured_preview_img').src = '';
    document.getElementById('featured_preview').classList.add('hidden');
}

function previewGalleryImages(input) {
    const files = Array.from(input.files || []);
    const gallery = document.getElementById('gallery_new_preview');
    gallery.innerHTML = '';
    selectedGalleryImages = [];

    files.forEach((file, index) => {
        if (!file || !file.type.startsWith('image/')) {
            return;
        }

        const reader = new FileReader();
        reader.onload = function(e) {
            const imageDiv = document.createElement('div');
            imageDiv.className = 'relative group';
            imageDiv.innerHTML = `
                <div class="relative">
                    <img src="${e.target.result}" alt="New Preview ${index + 1}" class="w-full h-32 object-cover rounded-lg border-2 border-green-300 shadow-md">
                    <button type="button" onclick="removeNewGalleryImage(${index})"
                            class="absolute -top-2 -right-2 bg-red-500 text-white rounded-full w-7 h-7 flex items-center justify-center text-xs hover:bg-red-600 shadow-lg transition-colors">
                        <i class="fas fa-times"></i>
                    </button>
                </div>
            `;
            gallery.appendChild(imageDiv);
            selectedGalleryImages.push({ file: file });
        };
        reader.readAsDataURL(file);
    });
}

function removeNewGalleryImage(index) {
    const input = document.getElementById('image_gallery_upload');
    const dt = new DataTransfer();

    Array.from(input.files).forEach((file, i) => {
        if (i !== index) {
            dt.items.add(file);
        }
    });

    input.files = dt.files;
    previewGalleryImages(input);
}

function removeExistingImage(index) {
    const imageInput = document.getElementById('existing_image_' + index);
    if (imageInput) {
        imageInput.remove();
    }
    const container = document.getElementById('existing_image_container_' + index);
    if (container) {
        container.remove();
    }
}

// Category and Subcategory handling
document.addEventListener('DOMContentLoaded', function() {
    const mainCategorySelect = document.getElementById('main_category');
    const subcategorySelect = document.getElementById('subcategory');
    const finalCategoryInput = document.getElementById('final_category_id');
    
    // Store all categories data
    const categoriesData = {};
    @foreach($categories as $category)
        categoriesData[{{ $category->id }}] = @json($category->subcategories);
    @endforeach
    
    // Handle main category change
    mainCategorySelect.addEventListener('change', function() {
        const categoryId = this.value;
        const subcategories = categoriesData[categoryId] || [];
        
        // Clear and populate subcategory select
        subcategorySelect.innerHTML = '<option value="">Select Subcategory</option>';
        
        if (subcategories.length > 0) {
            subcategorySelect.disabled = false;
            subcategories.forEach(function(subcategory) {
                const option = document.createElement('option');
                option.value = subcategory.id;
                option.textContent = subcategory.name;
                subcategorySelect.appendChild(option);
            });
        } else {
            subcategorySelect.disabled = true;
            // If no subcategories, use main category
            finalCategoryInput.value = categoryId;
        }
        
        // Reset subcategory selection if main category changed
        if (subcategorySelect.value && !subcategories.find(s => s.id == subcategorySelect.value)) {
            subcategorySelect.value = '';
            finalCategoryInput.value = categoryId;
        }
    });
    
    // Handle subcategory change
    subcategorySelect.addEventListener('change', function() {
        if (this.value) {
            finalCategoryInput.value = this.value;
        } else {
            // If no subcategory selected, use main category
            finalCategoryInput.value = mainCategorySelect.value || '';
        }
    });
    
    // Initialize on page load
    const currentCategoryId = {{ $product->category_id ?? 'null' }};
    if (currentCategoryId) {
        // Find which category this belongs to
        let foundCategory = null;
        let isSubcategory = false;
        
        @foreach($categories as $category)
            if ({{ $category->id }} == currentCategoryId) {
                foundCategory = {{ $category->id }};
                isSubcategory = false;
            }
            @foreach($category->subcategories as $subcategory)
                if ({{ $subcategory->id }} == currentCategoryId) {
                    foundCategory = {{ $category->id }};
                    isSubcategory = true;
                }
            @endforeach
        @endforeach
        
        if (foundCategory) {
            mainCategorySelect.value = foundCategory;
            mainCategorySelect.dispatchEvent(new Event('change'));
            
            if (isSubcategory) {
                setTimeout(() => {
                    subcategorySelect.value = currentCategoryId;
                    finalCategoryInput.value = currentCategoryId;
                }, 100);
            } else {
                finalCategoryInput.value = currentCategoryId;
            }
        }
    }
});
</script>
@endsection