@extends('layouts.admin')

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

@section('breadcrumb')
    <li class="breadcrumb-item"><a href="{{ route('admin.products.index') }}">Products</a></li>
    <li class="breadcrumb-item active">Edit</li>
@endsection

@section('content')
<div class="row">
    <div class="col-md-12">
        <div class="card card-primary">
            <div class="card-header">
                <h3 class="card-title">Edit Product: {{ $product->name }}</h3>
            </div>
            <form action="{{ route('admin.products.update', $product) }}" method="POST" enctype="multipart/form-data">
                @csrf
                @method('PUT')
                <div class="card-body">
                    <div class="row">
                        <div class="col-md-8">
                            <div class="form-group">
                                <label for="name">Product Name</label>
                                <input type="text" name="name" class="form-control @error('name') is-invalid @enderror" id="name" placeholder="Enter product name" value="{{ old('name', $product->name) }}" required>
                                @error('name')
                                    <span class="invalid-feedback">{{ $message }}</span>
                                @enderror
                            </div>

                            <div class="form-group">
                                <label for="description">Description</label>
                                <textarea name="description" class="form-control @error('description') is-invalid @enderror" id="description" rows="5" placeholder="Enter product description">{{ old('description', $product->description) }}</textarea>
                                @error('description')
                                    <span class="invalid-feedback">{{ $message }}</span>
                                @enderror
                            </div>

                            <div class="row">
                                <div class="col-md-6">
                                    <div class="form-group">
                                        <label for="category_id">Category</label>
                                        <select name="category_id" class="form-control select2 @error('category_id') is-invalid @enderror" id="category_id">
                                            <option value="">Select Category</option>
                                            @foreach($categories as $category)
                                                <option value="{{ $category->id }}" {{ old('category_id', $product->category_id) == $category->id ? 'selected' : '' }}>{{ $category->name }}</option>
                                            @endforeach
                                        </select>
                                        @error('category_id')
                                            <span class="invalid-feedback">{{ $message }}</span>
                                        @enderror
                                    </div>
                                </div>
                                <div class="col-md-6">
                                    <div class="form-group">
                                        <label for="brand_id">Brand</label>
                                        <select name="brand_id" class="form-control select2 @error('brand_id') is-invalid @enderror" id="brand_id">
                                            <option value="">Select Brand</option>
                                            @foreach($brands as $brand)
                                                <option value="{{ $brand->id }}" {{ old('brand_id', $product->brand_id) == $brand->id ? 'selected' : '' }}>{{ $brand->name }}</option>
                                            @endforeach
                                        </select>
                                        @error('brand_id')
                                            <span class="invalid-feedback">{{ $message }}</span>
                                        @enderror
                                    </div>
                                </div>
                            </div>

                            <div class="row">
                                <div class="col-md-4">
                                    <div class="form-group">
                                        <label for="price">Selling Price</label>
                                        <div class="input-group">
                                            <div class="input-group-prepend">
                                                <span class="input-group-text">$</span>
                                            </div>
                                            <input type="number" name="price" class="form-control @error('price') is-invalid @enderror" id="price" step="0.01" value="{{ old('price', $product->price) }}" required>
                                            @error('price')
                                                <span class="invalid-feedback">{{ $message }}</span>
                                            @enderror
                                        </div>
                                    </div>
                                </div>
                                <div class="col-md-4">
                                    <div class="form-group">
                                        <label for="buy_price">Buy Price (Cost)</label>
                                        <div class="input-group">
                                            <div class="input-group-prepend">
                                                <span class="input-group-text">$</span>
                                            </div>
                                            <input type="number" name="buy_price" class="form-control @error('buy_price') is-invalid @enderror" id="buy_price" step="0.01" value="{{ old('buy_price', $product->buy_price) }}">
                                            @error('buy_price')
                                                <span class="invalid-feedback">{{ $message }}</span>
                                            @enderror
                                        </div>
                                    </div>
                                </div>
                                <div class="col-md-4">
                                    <div class="form-group">
                                        <label for="stock">Stock</label>
                                        <input type="number" name="stock" class="form-control @error('stock') is-invalid @enderror" id="stock" value="{{ old('stock', $product->stock) }}" required>
                                        @error('stock')
                                            <span class="invalid-feedback">{{ $message }}</span>
                                        @enderror
                                    </div>
                                </div>
                            </div>

                            <div class="row">
                                <div class="col-md-4">
                                    <div class="form-group">
                                        <label for="unit">Unit</label>
                                        <input type="text" name="unit" class="form-control @error('unit') is-invalid @enderror" id="unit" placeholder="e.g. Dozen, Box" value="{{ old('unit', $product->unit) }}">
                                        @error('unit')
                                            <span class="invalid-feedback">{{ $message }}</span>
                                        @enderror
                                    </div>
                                </div>
                                <div class="col-md-4">
                                    <div class="form-group">
                                        <label for="base_unit">Base Unit</label>
                                        <input type="text" name="base_unit" class="form-control @error('base_unit') is-invalid @enderror" id="base_unit" placeholder="e.g. Pcs, Kg" value="{{ old('base_unit', $product->base_unit) }}">
                                        @error('base_unit')
                                            <span class="invalid-feedback">{{ $message }}</span>
                                        @enderror
                                    </div>
                                </div>
                                <div class="col-md-4">
                                    <div class="form-group">
                                        <label for="unit_conversion">Conversion Rate</label>
                                        <input type="number" name="unit_conversion" class="form-control @error('unit_conversion') is-invalid @enderror" id="unit_conversion" step="0.01" placeholder="e.g. 12 (1 Unit = 12 Base)" value="{{ old('unit_conversion', $product->unit_conversion) }}">
                                        <small class="form-text text-muted">1 Unit = ? Base Units</small>
                                        @error('unit_conversion')
                                            <span class="invalid-feedback">{{ $message }}</span>
                                        @enderror
                                    </div>
                                </div>
                            </div>

                            <hr>
                            <h4 class="mb-3">Product Variants</h4>
                            <div id="variants-container">
                                <!-- Variants will be populated by JS -->
                            </div>
                            <button type="button" class="btn btn-success btn-sm mt-2" id="add-variant"><i class="fas fa-plus"></i> Add Variant</button>
                        </div>

                        <div class="col-md-4">
                             <div class="form-group">
                                <label for="is_active">Status</label>
                                <div class="custom-control custom-switch">
                                    <input type="checkbox" class="custom-control-input" id="is_active" name="is_active" value="1" {{ $product->is_active ? 'checked' : '' }}>
                                    <label class="custom-control-label" for="is_active">Active</label>
                                </div>
                            </div>

                            <div class="form-group">
                                <label for="image">Main Image</label>
                                <div class="input-group">
                                    <div class="custom-file">
                                        <input type="file" name="image" class="custom-file-input @error('image') is-invalid @enderror" id="image" onchange="previewImage(this, 'image-preview')">
                                        <label class="custom-file-label" for="image">Choose file</label>
                                    </div>
                                </div>
                                <div class="mt-2 text-center">
                                    @if($product->image)
                                        <img id="image-preview" src="{{ asset('storage/' . $product->image) }}" alt="Image Preview" style="max-width: 100%; max-height: 200px; border: 1px solid #ddd; padding: 5px;">
                                    @else
                                        <img id="image-preview" src="#" alt="Image Preview" style="max-width: 100%; max-height: 200px; display: none; border: 1px solid #ddd; padding: 5px;">
                                    @endif
                                </div>
                                @error('image')
                                    <span class="invalid-feedback d-block">{{ $message }}</span>
                                @enderror
                            </div>

                            <div class="form-group">
                                <label for="thumbnail">Thumbnail Image</label>
                                <div class="input-group">
                                    <div class="custom-file">
                                        <input type="file" name="thumbnail" class="custom-file-input @error('thumbnail') is-invalid @enderror" id="thumbnail" onchange="previewImage(this, 'thumbnail-preview')">
                                        <label class="custom-file-label" for="thumbnail">Choose file</label>
                                    </div>
                                </div>
                                <div class="mt-2 text-center">
                                    @if($product->thumbnail)
                                        <img id="thumbnail-preview" src="{{ asset('storage/' . $product->thumbnail) }}" alt="Thumbnail Preview" style="max-width: 100%; max-height: 150px; border: 1px solid #ddd; padding: 5px;">
                                    @else
                                        <img id="thumbnail-preview" src="#" alt="Thumbnail Preview" style="max-width: 100%; max-height: 150px; display: none; border: 1px solid #ddd; padding: 5px;">
                                    @endif
                                </div>
                                @error('thumbnail')
                                    <span class="invalid-feedback d-block">{{ $message }}</span>
                                @enderror
                            </div>

                            <div class="form-group">
                                <label for="images">Gallery Images</label>
                                <div class="input-group mb-2">
                                    <div class="custom-file">
                                        <input type="file" name="images[]" class="custom-file-input @error('images') is-invalid @enderror" id="images" multiple>
                                        <label class="custom-file-label" for="images">Choose files</label>
                                    </div>
                                </div>
                                
                                @if($product->images)
                                    <div class="row mt-2">
                                        @foreach($product->images as $img)
                                            <div class="col-4 mb-2 text-center position-relative">
                                                <img src="{{ asset('storage/' . $img) }}" class="img-fluid img-thumbnail" style="height: 80px; object-fit: cover;">
                                                <div class="mt-1">
                                                    <div class="icheck-danger d-inline">
                                                        <input type="checkbox" id="remove_img_{{ $loop->index }}" name="remove_images[]" value="{{ $img }}">
                                                        <label for="remove_img_{{ $loop->index }}">
                                                            Remove
                                                        </label>
                                                    </div>
                                                </div>
                                            </div>
                                        @endforeach
                                    </div>
                                @endif
                                @error('images')
                                    <span class="invalid-feedback d-block">{{ $message }}</span>
                                @enderror
                            </div>

                        </div>
                    </div>
                </div>
                <div class="card-footer">
                    <button type="submit" class="btn btn-primary">Update Product</button>
                    <a href="{{ route('admin.products.index') }}" class="btn btn-default float-right">Cancel</a>
                </div>
            </form>
        </div>
    </div>
</div>
@endsection

@section('scripts')
<script>
    function previewImage(input, previewId) {
        if (input.files && input.files[0]) {
            var reader = new FileReader();
            reader.onload = function(e) {
                $('#' + previewId).attr('src', e.target.result).show();
            }
            reader.readAsDataURL(input.files[0]);
        }
    }

    // Custom File Input
    $(function () {
        bsCustomFileInput.init();
    });

    // Variants Logic
    let variantIndex = {{ $product->variants ? count($product->variants) : 0 }};
    const existingVariants = @json($product->variants ?? []);

    function renderVariant(index, data = {}) {
        let html = `
            <div class="row variant-row mb-2" id="variant-${index}">
                <div class="col-md-2">
                    <input type="text" name="variants[${index}][color]" class="form-control" placeholder="Color" value="${data.color || ''}">
                </div>
                <div class="col-md-2">
                    <input type="text" name="variants[${index}][size]" class="form-control" placeholder="Size" value="${data.size || ''}">
                </div>
                <div class="col-md-3">
                    <input type="text" name="variants[${index}][origin]" class="form-control" placeholder="Origin" value="${data.origin || ''}">
                </div>
                <div class="col-md-2">
                    <input type="number" name="variants[${index}][price]" class="form-control" placeholder="Price (Optional)" step="0.01" value="${data.price || ''}">
                </div>
                <div class="col-md-2">
                    <input type="number" name="variants[${index}][stock]" class="form-control" placeholder="Stock" min="0" value="${data.stock || ''}">
                </div>
                <div class="col-md-1">
                    <button type="button" class="btn btn-danger btn-sm remove-variant" onclick="removeVariant(${index})"><i class="fas fa-trash"></i></button>
                </div>
            </div>
        `;
        $('#variants-container').append(html);
    }

    // Load existing variants
    if (existingVariants && existingVariants.length > 0) {
        existingVariants.forEach((variant, index) => {
            renderVariant(index, variant);
        });
    } else {
        // Optional: Add one empty row if no variants exist? No, keep clean.
    }

    $('#add-variant').click(function() {
        renderVariant(variantIndex);
        variantIndex++;
    });

    window.removeVariant = function(index) {
        $('#variant-' + index).remove();
    };
</script>
@endsection