<?php
/**
 * Discord, via a channel webhook.
 *
 * @package ProfitEngine
 */

declare( strict_types=1 );

namespace ProfitEngine\Notifications\Channels;

defined( 'ABSPATH' ) || exit;

/**
 * Posts an embed to a Discord webhook.
 */
class DiscordChannel extends Channel {

	/**
	 * Embed accent colour per alert type.
	 *
	 * @var array<string,int>
	 */
	private const COLORS = array(
		'critical'     => 0xE11D48,
		'out_of_stock' => 0xE11D48,
		'warning'      => 0xF59E0B,
		'low_stock'    => 0xF59E0B,
		'po_overdue'   => 0xF59E0B,
	);

	/**
	 * Send a message.
	 *
	 * @param array<string,mixed> $message Message.
	 * @param array<string,mixed> $config  Channel config.
	 * @return true|\WP_Error
	 */
	public function send( array $message, array $config ) {
		$lines = array();
		if ( '' !== (string) ( $message['intro'] ?? '' ) ) {
			$lines[] = (string) $message['intro'];
		}
		foreach ( $this->item_lines( $message ) as $line ) {
			$lines[] = '• ' . $line;
		}

		return $this->post_json(
			(string) $config['webhook_url'],
			array(
				'username'         => 'ProfitEngine',
				// Never ping @everyone/@here or roles from product names.
				'allowed_mentions' => array( 'parse' => array() ),
				'embeds'           => array(
					array(
						'title'       => mb_substr( (string) $message['title'], 0, 250 ),
						'description' => mb_substr( implode( "\n", $lines ), 0, 4000 ),
						'url'         => esc_url_raw( (string) $message['url'] ),
						'color'       => self::COLORS[ (string) $message['event'] ] ?? 0x12B48A,
						'footer'      => array( 'text' => (string) $message['site'] ),
						'timestamp'   => gmdate( 'c' ),
					),
				),
			)
		);
	}
}