<?php
/**
 * AKSRT SMS Provider — 自定义 HTTP 接口
 *
 * 支持用户自定义短信发送 HTTP 接口。
 * 可配置请求 URL、方法、鉴权方式、Header、Body 字段映射和成功判定规则。
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_SMS_Provider_Custom implements AKSRT_SMS_Provider {

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

    public function get_label(): string {
        return __('自定义接口', 'aksrt');
    }

    public function validate_config(array $config): array {
        $missing = [];
        if (empty($config['sms_custom_url'])) $missing[] = 'sms_custom_url';
        return $missing;
    }

    public function send_code(string $phone, string $code, array $config): array {
        $url         = (string) ($config['sms_custom_url'] ?? '');
        $method      = strtoupper((string) ($config['sms_custom_method'] ?? 'POST'));
        $auth_type   = (string) ($config['sms_custom_auth_type'] ?? 'header');
        $auth_key    = (string) ($config['sms_custom_auth_key'] ?? '');
        $auth_value  = (string) ($config['sms_custom_auth_value'] ?? '');
        $headers_raw = (string) ($config['sms_custom_headers'] ?? '');
        $body_tpl    = (string) ($config['sms_custom_body'] ?? '');
        $success_rule = (string) ($config['sms_custom_success_rule'] ?? '');

        if ($url === '') {
            return ['success' => false, 'message' => __('自定义接口 URL 未配置', 'aksrt'), 'transport' => 'custom_http'];
        }

        // 替换模板变量
        $replacements = [
            '{phone}'   => $phone,
            '{code}'    => $code,
            '{time}'    => (string) time(),
        ];

        $body = str_replace(array_keys($replacements), array_values($replacements), $body_tpl);

        // 解析自定义 headers
        $headers = ['Accept' => 'application/json'];
        if ($headers_raw !== '') {
            foreach (explode("\n", $headers_raw) as $line) {
                $line = trim($line);
                if ($line === '') continue;
                $parts = explode(':', $line, 2);
                if (count($parts) === 2) {
                    $headers[trim($parts[0])] = trim(str_replace(array_keys($replacements), array_values($replacements), $parts[1]));
                }
            }
        }

        // 鉴权
        if ($auth_key !== '' && $auth_value !== '') {
            $replaced_value = str_replace(array_keys($replacements), array_values($replacements), $auth_value);
            if ($auth_type === 'header') {
                $headers[$auth_key] = $replaced_value;
            }
        }

        $args = [
            'timeout' => 10,
            'headers' => $headers,
        ];

        if (in_array($method, ['POST', 'PUT', 'PATCH'], true)) {
            $args['body'] = $body;
            $result = wp_remote_request($url, array_merge($args, ['method' => $method]));
        } else {
            // GET — append body as query params
            $url_with_params = add_query_arg(json_decode($body, true) ?: [], $url);
            $result = wp_remote_get($url_with_params, $args);
        }

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

        $status_code = wp_remote_retrieve_response_code($result);
        $response_body = wp_remote_retrieve_body($result);

        // 判定成功规则
        if ($success_rule !== '') {
            $matched = $this->check_success_rule($success_rule, $status_code, $response_body);
            if ($matched) {
                $this->log('sent', $phone, "status={$status_code}");
                return ['success' => true, 'message' => __('验证码已发送', 'aksrt'), 'transport' => 'custom_http'];
            }
            $this->log('error', $phone, "status={$status_code}, rule not matched");
            return ['success' => false, 'message' => sprintf(__('自定义接口返回异常 (HTTP %d)', 'aksrt'), $status_code), 'transport' => 'custom_http'];
        }

        // 默认：HTTP 2xx 视为成功
        if ($status_code >= 200 && $status_code < 300) {
            $this->log('sent', $phone, "status={$status_code}");
            return ['success' => true, 'message' => __('验证码已发送', 'aksrt'), 'transport' => 'custom_http'];
        }

        $this->log('error', $phone, "status={$status_code}");
        return ['success' => false, 'message' => sprintf(__('自定义接口返回 HTTP %d', 'aksrt'), $status_code), 'transport' => 'custom_http'];
    }

    public function get_status(array $config): array {
        $missing = $this->validate_config($config);
        return [
            'provider'       => $this->get_key(),
            'configured'     => empty($missing),
            'available'      => !empty($config['sms_enabled']) && empty($missing),
            'verified'       => !empty($config['sms_custom_verified']),
            'transport'      => 'custom_http',
            'missing_fields' => $missing,
        ];
    }

    /**
     * 校验成功规则
     *
     * 支持格式：
     * - "status:200" — HTTP 状态码匹配
     * - "json:code=0" — JSON 响应中字段匹配
     * - "contains:success" — 响应体包含字符串
     */
    private function check_success_rule(string $rule, int $status_code, string $body): bool {
        $parts = explode(':', $rule, 2);
        if (count($parts) < 2) return false;

        $type  = trim($parts[0]);
        $value = trim($parts[1]);

        switch ($type) {
            case 'status':
                return (string) $status_code === $value;

            case 'json':
                $json = json_decode($body, true);
                if (!is_array($json)) return false;
                $kv = explode('=', $value, 2);
                if (count($kv) !== 2) return false;
                $key = trim($kv[0]);
                $expected = trim($kv[1]);
                return (string) ($json[$key] ?? '') === $expected;

            case 'contains':
                return strpos($body, $value) !== false;

            default:
                return false;
        }
    }

    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] [custom] [%s] Phone: %s — %s', $level, $masked, $message));
    }
}