<?php
namespace App\Services;

use GuzzleHttp\Client;

class PrometheusService
{
    protected $client;
    protected $baseUri = 'http://127.0.0.1:9090/api/v1/'; // Prometheus 的默认地址

    public function __construct()
    {
        $this->client = new Client(['base_uri' => $this->baseUri]);
    }

    /**
     * 执行 Prometheus 实时查询
     *
     * @param string $query PromQL 查询语句
     * @return array 返回查询结果
     */
    public function query($query)
    {
        try {
            $response = $this->client->get('query', [
                'query' => ['query' => $query],
            ]);
            return json_decode($response->getBody()->getContents(), true);
        } catch (\Exception $e) {
            // 处理异常，记录日志或返回错误信息
            error_log('Query failed: ' . $e->getMessage());
            return ['error' => 'Failed to execute query', 'message' => $e->getMessage()];
        }
    }


    /**
     * 执行 Prometheus 区间查询
     *
     * @param string $query PromQL 查询语句
     * @param int $start 开始时间（时间戳，单位秒）
     * @param int $end 结束时间（时间戳，单位秒）
     * @param int $step 时间间隔（单位秒）
     * @return array 返回查询结果
     */
    public function queryRange($query, $start, $end, $step)
    {
        try {
            $response = $this->client->get('query_range', [
                'query' => [
                    'query' => $query,
                    'start' => $start,
                    'end' => $end,
                    'step' => $step,
                ],
            ]);
            return json_decode($response->getBody()->getContents(), true);
        } catch (\Exception $e) {
            // 处理异常，记录日志或返回错误信息
            error_log('Query range failed: ' . $e->getMessage());
            return ['error' => 'Failed to execute query range', 'message' => $e->getMessage()];
        }
    }


    /**
     * 获取 Prometheus 监控的所有目标
     *
     * @return array 返回目标信息
     */
    public function getTargets()
    {
        $response = $this->client->get('targets');
        return json_decode($response->getBody()->getContents(), true);
    }
}