<?php
namespace Zadex\Dynamic\Tags;

defined('ABSPATH') || exit;

use Zadex\Dynamic\Context;
use Zadex\Dynamic\Tag;

/**
 * Manual excerpt, or the first `length` words of the content. Never calls get_the_excerpt(): without a manual
 * excerpt WordPress would run `the_content` on the post, which renders the Zadex document again (recursion).
 */
final class PostExcerpt extends Tag
{
    public function name(): string
    {
        return 'post-excerpt';
    }

    public function title(): string
    {
        return __('Post excerpt', 'zadex');
    }

    public function controls(): array
    {
        return [
            ['id' => 'length', 'type' => 'number', 'label' => __('Length (words)', 'zadex'), 'default' => 55, 'min' => 0],
        ];
    }

    public function render(array $settings, Context $ctx)
    {
        $post = $ctx->post();
        if (!$post) {
            return '';
        }
        $length = isset($settings['length']) && is_numeric($settings['length']) ? max(0, (int) $settings['length']) : 55;
        $excerpt = trim((string) ($post->post_excerpt ?? ''));
        if ($excerpt === '') {
            $content = (string) ($post->post_content ?? '');
            if (function_exists('strip_shortcodes')) {
                $content = strip_shortcodes($content);
            }
            $excerpt = trim((string) preg_replace('/\s+/', ' ', wp_strip_all_tags($content)));
        }
        if ($length > 0) {
            $words = preg_split('/\s+/u', $excerpt, -1, PREG_SPLIT_NO_EMPTY) ?: [];
            if (count($words) > $length) {
                $excerpt = implode(' ', array_slice($words, 0, $length)) . '…';
            }
        }
        return $excerpt;
    }
}