<?php
/**
 * Email rendering.
 *
 * @package HostKhata
 */

namespace HostKhata\Domain\Email;

defined( 'ABSPATH' ) || exit;

use HostKhata\Settings\Settings;
use HostKhata\Support\View;

/**
 * Turns a template and its values into a subject, an HTML body and a plain-text body.
 *
 * Values are escaped as part of the whole message, so a customer name or a note
 * can never inject markup into an email.
 *
 * @since 0.1.0
 */
final class EmailRenderer {

	/**
	 * Templates.
	 *
	 * @var EmailTemplates
	 */
	private $templates;

	/**
	 * Settings.
	 *
	 * @var Settings
	 */
	private $settings;

	/**
	 * Constructor.
	 *
	 * @param EmailTemplates $templates Templates.
	 * @param Settings       $settings  Settings.
	 */
	public function __construct( EmailTemplates $templates, Settings $settings ) {
		$this->templates = $templates;
		$this->settings  = $settings;
	}

	/**
	 * Renders a template.
	 *
	 * @since 0.1.0
	 *
	 * @param string                $key      Template key.
	 * @param array<string, scalar> $vars     Merge tag values.
	 * @param array<string, string> $override Optional `subject` and `body` to use instead of the stored ones (for previews).
	 * @return array{subject: string, html: string, text: string}|null Null for an unknown template.
	 */
	public function render( string $key, array $vars, array $override = array() ): ?array {
		$template = $this->templates->get( $key );

		if ( null === $template ) {
			return null;
		}

		$subject = isset( $override['subject'] ) && '' !== $override['subject'] ? $override['subject'] : $template['subject'];
		$body    = isset( $override['body'] ) && '' !== $override['body'] ? $override['body'] : $template['body'];

		$subject = trim( preg_replace( '/\s+/', ' ', wp_strip_all_tags( MergeTags::apply( $subject, $vars ) ) ) );
		$text    = trim( preg_replace( "/\n{3,}/", "\n\n", MergeTags::apply( $body, $vars ) ) );
		$content = make_clickable( wpautop( esc_html( $text ) ) );

		$html = View::render(
			'emails/layout',
			array(
				'subject'  => $subject,
				'content'  => $content,
				'business' => (string) $this->settings->get( 'business_name' ),
				'logo'     => (string) $this->settings->get( 'business_logo_url' ),
				'footer'   => (string) $this->settings->get( 'invoice_footer' ),
			)
		);

		return array(
			'subject' => $subject,
			'html'    => $html,
			'text'    => $text,
		);
	}
}