<?php
add_action( 'save_post_product', 'caz_ai_product_tagging_woocommerce', 20, 2 );

function caz_ai_product_tagging_woocommerce( int $post_id, WP_Post $post ): void {
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return;
    if ( wp_is_post_revision( $post_id ) ) return;

    // Only tag if no tags exist (preserve manual tags)
    $existing_tags = wp_get_post_terms( $post_id, 'product_tag', ['fields' => 'names'] );
    if ( ! empty( $existing_tags ) ) return;

    $product    = wc_get_product( $post_id );
    $name       = $product->get_name();
    $desc       = wp_strip_all_tags( $product->get_short_description() ?: $product->get_description() );
    $categories = wp_list_pluck( $product->get_category_ids() ? get_the_terms( $post_id, 'product_cat' ) : [], 'name' );

    // Get existing store tags to guide AI product tagging WooCommerce consistency
    $existing_store_tags = get_terms(['taxonomy' => 'product_tag', 'fields' => 'names', 'number' => 50]);

    $prompt = "Generate product tags for a WooCommerce product.
Product name: {$name}
Description: " . substr( $desc, 0, 300 ) . "
Categories: " . implode( ', ', $categories ) . "
Existing store tags (use these if relevant): " . implode( ', ', array_slice( $existing_store_tags, 0, 30 ) ) . "

Rules for AI product tagging WooCommerce:
- Generate 5 to 8 tags maximum
- Use lowercase, hyphenated format (e.g. 'free-delivery', 'machine-washable')
- Prefer existing store tags when they fit
- Avoid generic tags like 'product' or 'item'
- Focus on material, use case, audience, and key features
Return only a JSON array of tag strings, nothing else.";

    $tags = caz_ai_generate_tags( $prompt );

    if ( ! empty( $tags ) ) {
        wp_set_post_terms( $post_id, $tags, 'product_tag', false );
    }
}

function caz_ai_generate_tags( string $prompt ): array {
    $response = wp_remote_post( 'https://api.openai.com/v1/chat/completions', [
        'headers' => [
            'Authorization' => 'Bearer ' . get_option( 'caz_openai_key' ),
            'Content-Type'  => 'application/json',
        ],
        'body' => wp_json_encode([
            'model'      => 'gpt-4o-mini',
            'max_tokens' => 120,
            'messages'   => [[ 'role' => 'user', 'content' => $prompt ]],
        ]),
        'timeout' => 15,
    ]);

    if ( is_wp_error( $response ) ) return [];
    $body    = json_decode( wp_remote_retrieve_body( $response ), true );
    $content = $body['choices'][0]['message']['content'] ?? '[]';
    $tags    = json_decode( trim( $content ), true );
    // Validate and sanitise each tag for AI product tagging WooCommerce
    return is_array( $tags ) ? array_map( 'sanitize_title', array_slice( $tags, 0, 8 ) ) : [];
}

# Register the bulk AI product tagging WooCommerce command
# Add to functions.php or a custom plugin

# Run from server command line:
wp caz tag-products --dry-run    # Preview without saving
wp caz tag-products              # Run bulk AI product tagging WooCommerce

# Expected output:
# Tagged product #1042: blue-cotton-hoodie, mens-casual, machine-washable...
# Tagged product #1043: leather-wallet, bifold, slim-design, gift-idea...
# Skipped product #1044: already has 6 tags
# Completed: 487 tagged, 23 skipped, 2 errors