@extends('layouts.app')

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

@section('content')
<div class="max-w-3xl mx-auto px-4 sm:px-6 lg:px-8">
    <div class="mb-6 flex items-center justify-between">
        <h1 class="text-2xl font-bold">Edit Product</h1>
        <a href="{{ route('products.index') }}" class="text-gray-600 hover:text-gray-900 dark:text-gray-400 dark:hover:text-gray-200">
            ← Back to Products
        </a>
    </div>

    <form method="POST" action="{{ route('products.update', $product) }}" class="bg-white dark:bg-gray-800 shadow rounded-lg p-6">
        @csrf
        @method('PUT')

        <div class="space-y-6">
            <!-- Product Name -->
            <div>
                <label class="block text-sm font-medium mb-2">Product Name <span class="text-red-500">*</span></label>
                <input type="text" name="name" required
                       class="w-full px-3 py-2 rounded-md border border-gray-300 dark:border-gray-600 dark:bg-gray-700"
                       value="{{ old('name', $product->name) }}"
                       placeholder="e.g., Blue T-Shirt (L)">
                @error('name')
                    <p class="text-red-500 text-xs mt-1">{{ $message }}</p>
                @enderror
            </div>

            <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
                <!-- SKU -->
                <div>
                    <label class="block text-sm font-medium mb-2">SKU / Product Code</label>
                    <input type="text" name="sku"
                           class="w-full px-3 py-2 rounded-md border border-gray-300 dark:border-gray-600 dark:bg-gray-700"
                           value="{{ old('sku', $product->sku) }}"
                           placeholder="e.g., TS-BLU-L">
                    @error('sku')
                        <p class="text-red-500 text-xs mt-1">{{ $message }}</p>
                    @enderror
                </div>

                <!-- Barcode (UPC/EAN) -->
                <div>
                    <label class="block text-sm font-medium mb-2">Barcode (UPC/EAN)</label>
                    <input type="text" name="barcode"
                           class="w-full px-3 py-2 rounded-md border border-gray-300 dark:border-gray-600 dark:bg-gray-700"
                           value="{{ old('barcode', $product->barcode) }}"
                           placeholder="e.g., 8901234567890">
                    @error('barcode')
                        <p class="text-red-500 text-xs mt-1">{{ $message }}</p>
                    @enderror
                    <p class="text-xs text-gray-500 mt-1">Optional - for barcode scanning in POS</p>
                </div>
            </div>

            <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
                <!-- Product Type -->
                <div>
                    <label class="block text-sm font-medium mb-2">Product Type <span class="text-red-500">*</span></label>
                    <select name="product_type" id="product_type" required
                            class="w-full px-3 py-2 rounded-md border border-gray-300 dark:border-gray-600 dark:bg-gray-700">
                        <option value="single" {{ old('product_type', $product->product_type) == 'single' ? 'selected' : '' }}>Single Product</option>
                        <option value="bundle" {{ old('product_type', $product->product_type) == 'bundle' ? 'selected' : '' }}>Bundle / Package</option>
                    </select>
                    @error('product_type')
                        <p class="text-red-500 text-xs mt-1">{{ $message }}</p>
                    @enderror
                </div>
            </div>

            <!-- Bundle Items (shown only for bundles) -->
            <div id="bundle_section" class="{{ $product->isBundle() ? '' : 'hidden' }}">
                <label class="block text-sm font-medium mb-2">Bundle Items</label>
                <div class="space-y-2 mb-2" id="bundle_items">
                    @if($product->bundle_items)
                        @foreach($product->bundle_items as $index => $item)
                            <div class="flex gap-2 items-center" data-existing-item>
                                <select name="bundle_items[{{ $index }}][product_id]" required
                                        class="flex-1 rounded-md border-gray-300 dark:border-gray-600 dark:bg-gray-700 text-sm">
                                    <option value="">Select Product</option>
                                    @foreach(\App\Models\Product::where('product_type', 'single')->where('is_active', true)->orderBy('name')->get() as $prod)
                                        <option value="{{ $prod->id }}"
                                                data-sku="{{ $prod->sku }}"
                                                data-name="{{ $prod->name }}"
                                                {{ ($item['product_id'] ?? null) == $prod->id ? 'selected' : '' }}>
                                            {{ $prod->name }} {{ $prod->sku ? '('.$prod->sku.')' : '' }}
                                        </option>
                                    @endforeach
                                </select>
                                <input type="hidden" name="bundle_items[{{ $index }}][sku]" value="{{ $item['sku'] ?? '' }}">
                                <input type="hidden" name="bundle_items[{{ $index }}][name]" value="{{ $item['name'] ?? '' }}">
                                <input type="number" name="bundle_items[{{ $index }}][quantity]"
                                       value="{{ $item['quantity'] ?? 1 }}"
                                       placeholder="Qty" min="1" required
                                       class="w-24 rounded-md border-gray-300 dark:border-gray-600 dark:bg-gray-700 text-sm">
                                <button type="button" onclick="removeBundleItem(this)"
                                        class="text-red-600 hover:text-red-800 text-sm font-medium">
                                    Remove
                                </button>
                            </div>
                        @endforeach
                    @endif
                </div>
                <button type="button" onclick="addBundleItem()"
                        class="text-sm text-blue-600 hover:text-blue-800">
                    + Add Item to Bundle
                </button>
                <p class="text-xs text-gray-500 mt-1">Select products and quantities that make up this bundle</p>
            </div>

            <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
                <!-- Price -->
                <div>
                    <label class="block text-sm font-medium mb-2">Price (RM) <span class="text-red-500">*</span></label>
                    <input type="number" name="price" required min="0" step="0.01"
                           class="w-full px-3 py-2 rounded-md border border-gray-300 dark:border-gray-600 dark:bg-gray-700"
                           value="{{ old('price', $product->price) }}"
                           placeholder="0.00">
                    @error('price')
                        <p class="text-red-500 text-xs mt-1">{{ $message }}</p>
                    @enderror
                </div>

            <!-- Stock -->
            <div>
                <label class="block text-sm font-medium mb-2">Stock Quantity</label>
                <input type="number" name="stock" min="0" id="stock_input"
                       class="w-full px-3 py-2 rounded-md border border-gray-300 dark:border-gray-600 dark:bg-gray-700"
                       value="{{ old('stock', $product->stock) }}"
                       placeholder="Leave empty if not tracking stock">
                @error('stock')
                    <p class="text-red-500 text-xs mt-1">{{ $message }}</p>
                @enderror
            </div>
            </div>

            <!-- Inventory Tracking Section -->
            <div class="border border-gray-200 dark:border-gray-700 rounded-lg p-4 bg-gray-50 dark:bg-gray-900">
                <div class="flex items-center mb-4">
                    <input type="checkbox" name="track_inventory" id="track_inventory" value="1"
                           {{ old('track_inventory', $product->track_inventory) ? 'checked' : '' }}
                           class="rounded border-gray-300 dark:border-gray-600 dark:bg-gray-700 text-blue-600 focus:ring-blue-500">
                    <label for="track_inventory" class="ml-2 text-sm font-medium">
                        Track Inventory
                    </label>
                </div>
                <p class="text-xs text-gray-500 mb-4">Enable to enforce stock limits. Customers cannot purchase if out of stock.</p>

                <div id="inventory_options" class="{{ old('track_inventory', $product->track_inventory) ? '' : 'hidden' }}">
                    <!-- Inventory Source -->
                    <div class="mb-4">
                        <label class="block text-sm font-medium mb-2">Stock Source</label>
                        <div class="space-y-2">
                            <label class="flex items-center">
                                <input type="radio" name="inventory_source" value="local"
                                       {{ old('inventory_source', $product->inventory_source ?? 'local') == 'local' ? 'checked' : '' }}
                                       class="border-gray-300 dark:border-gray-600 text-blue-600 focus:ring-blue-500">
                                <span class="ml-2 text-sm">Local - Use stock quantity above</span>
                            </label>
                            <label class="flex items-center">
                                <input type="radio" name="inventory_source" value="production"
                                       {{ old('inventory_source', $product->inventory_source) == 'production' ? 'checked' : '' }}
                                       class="border-gray-300 dark:border-gray-600 text-blue-600 focus:ring-blue-500">
                                <span class="ml-2 text-sm">Sync with warehouse</span>
                            </label>
                        </div>
                        @error('inventory_source')
                            <p class="text-red-500 text-xs mt-1">{{ $message }}</p>
                        @enderror
                    </div>

                    <!-- Warehouse Selection (for production source) -->
                    <div id="warehouse_section" class="{{ old('inventory_source', $product->inventory_source) == 'production' ? '' : 'hidden' }}">
                        <label class="block text-sm font-medium mb-2">Select Warehouse <span class="text-red-500">*</span></label>
                        <select name="warehouse_id" id="warehouse_id"
                                class="w-full px-3 py-2 rounded-md border border-gray-300 dark:border-gray-600 dark:bg-gray-700">
                            <option value="">-- Select Warehouse --</option>
                            @isset($warehouses)
                                @foreach($warehouses as $warehouse)
                                    <option value="{{ $warehouse->id }}"
                                            {{ old('warehouse_id', $product->warehouse_id) == $warehouse->id ? 'selected' : '' }}>
                                        {{ $warehouse->name }} ({{ $warehouse->code }})
                                        @if($warehouse->city) - {{ $warehouse->city }} @endif
                                    </option>
                                @endforeach
                            @endisset
                        </select>
                        @error('warehouse_id')
                            <p class="text-red-500 text-xs mt-1">{{ $message }}</p>
                        @enderror
                        @if(empty($warehouses))
                            <p class="text-xs text-amber-600 mt-1">No warehouses available. Please contact admin or use local stock.</p>
                        @endif
                    </div>

                    <!-- Low Stock Threshold -->
                    <div class="mt-4">
                        <label class="block text-sm font-medium mb-2">Low Stock Threshold</label>
                        <input type="number" name="low_stock_threshold" min="0"
                               class="w-full px-3 py-2 rounded-md border border-gray-300 dark:border-gray-600 dark:bg-gray-700"
                               value="{{ old('low_stock_threshold', $product->low_stock_threshold ?? 5) }}"
                               placeholder="5">
                        @error('low_stock_threshold')
                            <p class="text-red-500 text-xs mt-1">{{ $message }}</p>
                        @enderror
                        <p class="text-xs text-gray-500 mt-1">Show "Limited Stock!" warning when stock is at or below this value.</p>
                    </div>
                </div>
            </div>

            <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
            <!-- Description -->
            <div>
                <label class="block text-sm font-medium mb-2">Description</label>
                <textarea name="description" rows="3"
                          class="w-full px-3 py-2 rounded-md border border-gray-300 dark:border-gray-600 dark:bg-gray-700"
                          placeholder="Optional product description or notes">{{ old('description', $product->description) }}</textarea>
                @error('description')
                    <p class="text-red-500 text-xs mt-1">{{ $message }}</p>
                @enderror
            </div>

            <!-- Active Status -->
            <div class="flex items-center">
                <input type="checkbox" name="is_active" id="is_active" value="1"
                       {{ old('is_active', $product->is_active) ? 'checked' : '' }}
                       class="rounded border-gray-300 dark:border-gray-600 dark:bg-gray-700 text-blue-600 focus:ring-blue-500">
                <label for="is_active" class="ml-2 text-sm font-medium">
                    Active (available for checkout)
                </label>
            </div>
        </div>

        <!-- Action Buttons -->
        <div class="mt-8 flex items-center justify-end gap-3">
            <a href="{{ route('products.index') }}"
               class="px-6 py-2 border border-gray-300 dark:border-gray-600 rounded-lg hover:bg-gray-50 dark:hover:bg-gray-700 transition-colors">
                Cancel
            </a>
            <button type="submit"
                    class="px-6 py-2 bg-blue-600 hover:bg-blue-700 text-white rounded-lg shadow hover:shadow-lg transition-all">
                Update Product
            </button>
        </div>
    </form>
</div>

<script>
let bundleItemIndex = {{ $product->bundle_items ? count($product->bundle_items) : 0 }};

// Toggle bundle section visibility
document.getElementById('product_type').addEventListener('change', function() {
    const bundleSection = document.getElementById('bundle_section');
    if (this.value === 'bundle') {
        bundleSection.classList.remove('hidden');
        if (document.getElementById('bundle_items').children.length === 0) {
            addBundleItem(); // Add first item automatically
        }
    } else {
        bundleSection.classList.add('hidden');
    }
});

async function addBundleItem() {
    const container = document.getElementById('bundle_items');

    // Fetch products if not already fetched
    if (!window.allProducts) {
        try {
            const response = await fetch('{{ route("products.search.api") }}?q=');
            window.allProducts = await response.json();
        } catch (error) {
            console.error('Error fetching products:', error);
            window.allProducts = [];
        }
    }

    const itemDiv = document.createElement('div');
    itemDiv.className = 'flex gap-2 items-center';

    // Create product select options
    const productOptions = window.allProducts
        .filter(p => !p.is_bundle) // Only show single products, not bundles
        .map(p => `<option value="${p.id}" data-sku="${p.sku || ''}" data-name="${p.name}">${p.display_name || p.name} ${p.sku ? '('+p.sku+')' : ''}</option>`)
        .join('');

    itemDiv.innerHTML = `
        <select name="bundle_items[${bundleItemIndex}][product_id]" required
                onchange="updateBundleItemData(this, ${bundleItemIndex})"
                class="flex-1 rounded-md border-gray-300 dark:border-gray-600 dark:bg-gray-700 text-sm">
            <option value="">Select Product</option>
            ${productOptions}
        </select>
        <input type="hidden" name="bundle_items[${bundleItemIndex}][sku]" id="sku_${bundleItemIndex}">
        <input type="hidden" name="bundle_items[${bundleItemIndex}][name]" id="name_${bundleItemIndex}">
        <input type="number" name="bundle_items[${bundleItemIndex}][quantity]"
               placeholder="Qty" min="1" value="1" required
               class="w-24 rounded-md border-gray-300 dark:border-gray-600 dark:bg-gray-700 text-sm">
        <button type="button" onclick="removeBundleItem(this)"
                class="text-red-600 hover:text-red-800 text-sm font-medium">
            Remove
        </button>
    `;
    container.appendChild(itemDiv);
    bundleItemIndex++;
}

function updateBundleItemData(selectElement, index) {
    const selectedOption = selectElement.options[selectElement.selectedIndex];
    const sku = selectedOption.dataset.sku || '';
    const name = selectedOption.dataset.name || '';

    const skuInput = document.getElementById(`sku_${index}`);
    const nameInput = document.getElementById(`name_${index}`);

    if (skuInput) skuInput.value = sku;
    if (nameInput) nameInput.value = name;
}

function removeBundleItem(button) {
    button.parentElement.remove();
}

// Toggle inventory options visibility
document.getElementById('track_inventory').addEventListener('change', function() {
    const inventoryOptions = document.getElementById('inventory_options');
    if (this.checked) {
        inventoryOptions.classList.remove('hidden');
    } else {
        inventoryOptions.classList.add('hidden');
    }
});

// Toggle warehouse section visibility based on inventory source
document.querySelectorAll('input[name="inventory_source"]').forEach(function(radio) {
    radio.addEventListener('change', function() {
        const warehouseSection = document.getElementById('warehouse_section');
        const stockInput = document.getElementById('stock_input');

        if (this.value === 'production') {
            warehouseSection.classList.remove('hidden');
            stockInput.placeholder = 'Stock managed at warehouse level';
            stockInput.disabled = true;
        } else {
            warehouseSection.classList.add('hidden');
            stockInput.placeholder = 'Leave empty if not tracking stock';
            stockInput.disabled = false;
        }
    });
});

// Initialize state on page load
document.addEventListener('DOMContentLoaded', function() {
    const inventorySource = document.querySelector('input[name="inventory_source"]:checked');
    if (inventorySource && inventorySource.value === 'production') {
        const stockInput = document.getElementById('stock_input');
        stockInput.placeholder = 'Stock managed at warehouse level';
        stockInput.disabled = true;
    }
});
</script>
@endsection