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

namespace AKSRT\Sms;

defined('ABSPATH') || exit;

class SMSProviderAliyun implements ProviderInterface {

    public function get_key(): string {
        return 'ali';
    }

    public function validate_config(array $config): array {
        $missing = [];
        if (empty($config['sms_ali_keyid'])) $missing[] = 'sms_ali_keyid';
        if (empty($config['sms_ali_keysecret'])) $missing[] = 'sms_ali_keysecret';
        if (empty($config['sms_ali_sign_name'])) $missing[] = 'sms_ali_sign_name';
        if (($config['sms_ali_api_type'] ?? 'sms') !== 'verify' && empty($config['sms_ali_template_code'])) {
            $missing[] = 'sms_ali_template_code';
        }
        return $missing;
    }

    public function send_code(string $phone, string $code, array $config): array {
        $access_key    = (string) ($config['sms_ali_keyid'] ?? '');
        $access_secret = (string) ($config['sms_ali_keysecret'] ?? '');
        $sign_name     = (string) ($config['sms_ali_sign_name'] ?? '');
        $region_id     = (string) ($config['sms_region_id'] ?? 'cn-hangzhou');
		$verify_api = ($config['sms_ali_api_type'] ?? 'sms') === 'verify';
		$action = $verify_api ? 'SendSmsVerifyCode' : 'SendSms';
		$params = [
			($verify_api ? 'PhoneNumber' : 'PhoneNumbers') => $phone,
			'SignName' => $sign_name,
			'TemplateCode' => $verify_api ? '100001' : (string) ($config['sms_ali_template_code'] ?? ''),
			'TemplateParam' => wp_json_encode($verify_api ? ['code' => $code, 'min' => '30'] : ['code' => $code]),
		];
		$domain = $verify_api ? 'dypnsapi.aliyuncs.com' : 'dysmsapi.aliyuncs.com';

		$result = $this->request($access_key, $access_secret, $region_id, $domain, $action, $params);

        if (is_wp_error($result)) {
            $this->log('error', $phone, $result->get_error_message());
            return ['success' => false, 'message' => $result->get_error_message(), 'transport' => 'signed_post'];
        }

        if (($verify_api && ($result['Code'] ?? '') === 'OK') || (!$verify_api && (!empty($result['BizId']) || ($result['Code'] ?? '') === 'OK'))) {
            $this->log('sent', $phone, 'OK');
            return ['success' => true, 'message' => __('验证码已发送', 'aksrt'), 'transport' => 'signed_post'];
        }

        $err_code = $result['Code'] ?? 'Unknown';
        $err_msg  = $result['Message'] ?? __('未知错误', 'aksrt');
        $this->log('error', $phone, "{$err_code}: {$err_msg}");
        return ['success' => false, 'message' => sprintf('阿里云: %s (%s)', $err_msg, $err_code), 'transport' => 'signed_post'];
    }

    public function get_status(array $config): array {
        $missing = $this->validate_config($config);
        return [
            'provider'       => $this->get_key(),
            'configured'     => empty($missing),
            'available'      => ($config['sms_sdk'] ?? 'null') === $this->get_key() && empty($missing),
            'verified'       => false,
            'transport'      => 'signed_post',
            'missing_fields' => $missing,
        ];
    }

    /**
     * 发送阿里云短信 API 请求（POST 方式）
     *
     * 对齐 legacy 的 SignatureHelper 实现：
     * - POST 到 https://dysmsapi.aliyuncs.com/
     * - body 为 Signature=xxx&Key=Value&... 格式
     * - 使用 x-sdk-client header
     *
     * @return array|\WP_Error
     */
    private function request(string $access_key, string $access_secret, string $region_id, string $domain, string $action, array $biz_params) {
        if (!class_exists('AKSRT\\Sms\\SMSSignatureHelper')) {
            return new \WP_Error('sms_helper_missing', '签名助手类未加载');
        }

        $helper = new SMSSignatureHelper();

        return $helper->request(
            $access_key,
            $access_secret,
            $domain,
            array_merge($biz_params, [
                'RegionId' => $region_id,
                'Action'   => $action,
                'Version'  => '2017-05-25',
            ]),
            true // HTTPS
        );
    }

    private function log(string $level, string $phone, string $message): void {
        if (!defined('WP_DEBUG') || !WP_DEBUG) return;
        $masked = substr($phone, 0, 3) . '****' . substr($phone, -4);
        error_log(sprintf('[AKSRT SMS] [aliyun] [%s] Phone: %s — %s', $level, $masked, $message));
    }
}