<?php
/**
 * @package AKSRT
 */

namespace AKSRT\Settings;

defined('ABSPATH') || exit;

class Mail {

    /** 所有邮件事件类型常量 */
    public const EMAIL_EVENTS = [
        'reg_verify_link',
        'reg_verify_code',
        'reg_success',
        'password_reset',
        'change_code',
        'change_notice',
    ];

    /**
     * 获取邮件事件配置
     *
     * @param string $event 事件类型，留空返回全部
     * @return array
     */
    public static function get_email_event_config(string $event = ''): array {
        $s = Settings::get_all();

        $global = [
            'footer_text'   => sanitize_text_field((string) ($s['email_footer_text'] ?? '')),
            'site_branding' => !isset($s['email_site_branding']) || !empty($s['email_site_branding']),
            'template_mode' => in_array($s['email_template_mode'] ?? 'plain', ['plain', 'html'], true)
                ? ($s['email_template_mode'] ?? 'plain') : 'plain',
        ];

        if ($event === '') {
            $events = [];
            foreach (self::EMAIL_EVENTS as $ev) {
                $events[$ev] = self::build_email_event_entry($s, $ev);
            }
            return ['global' => $global, 'events' => $events];
        }

        if (!in_array($event, self::EMAIL_EVENTS, true)) {
            return ['enabled' => true, 'subject' => '', 'content' => '', 'html' => false, 'global' => $global];
        }

        return array_merge(self::build_email_event_entry($s, $event), ['global' => $global]);
    }

    /**
     * 邮件事件是否启用
     */
    public static function is_email_event_enabled(string $event): bool {
        if (!in_array($event, self::EMAIL_EVENTS, true)) {
            return true;
        }
        $s = Settings::get_all();
        return !isset($s["email_{$event}_enabled"]) || !empty($s["email_{$event}_enabled"]);
    }

    /**
     * 通过邮件事件体系发送邮件
     */
    public static function send_event_email(
        string $event,
        string $to,
        string $default_subject,
        string $default_content,
        array $placeholders = []
    ): bool {
        if (!self::is_email_event_enabled($event)) {
            return false;
        }

        $cfg = self::get_email_event_config($event);

        $subject = ($cfg['subject'] !== '') ? $cfg['subject'] : $default_subject;
        $subject = strtr($subject, $placeholders);

        $content = ($cfg['content'] !== '') ? $cfg['content'] : $default_content;
        $content = strtr($content, $placeholders);

        $branding = Settings::get_mail_branding();
        $footer = $cfg['global']['footer_text'];
        if ($footer === '' && $branding['description'] !== '') {
            $footer = $branding['description'];
        }
        if ($footer === '') {
            $footer = get_bloginfo('name');
        }
        if ($footer !== '') {
            $content .= "\n\n— " . $footer;
            if ($branding['description'] !== '' && $footer !== $branding['description']) {
                $content .= "\n" . $branding['description'];
            }
        }

        $is_html = $cfg['html'] || ($cfg['global']['template_mode'] === 'html');
        $headers = [$is_html ? 'Content-Type: text/html; charset=UTF-8' : 'Content-Type: text/plain; charset=UTF-8'];

        return wp_mail($to, $subject, $content, $headers);
    }

    /**
     * 构建单个邮件事件条目
     */
    private static function build_email_event_entry(array $s, string $event): array {
        return [
            'enabled' => !isset($s["email_{$event}_enabled"]) || !empty($s["email_{$event}_enabled"]),
            'subject' => sanitize_text_field((string) ($s["email_{$event}_subject"] ?? '')),
            'content' => sanitize_textarea_field((string) ($s["email_{$event}_content"] ?? '')),
            'html'    => !empty($s["email_{$event}_html"]),
        ];
    }
}