<?php

namespace App\Clients;

use Aliyun_Log_Client;
use Aliyun_Log_Models_GetLogsRequest;
use Aliyun_Log_Models_GetHistogramsRequest;
use Aliyun_Log_Exception;
use RuntimeException;

class SlsClient
{
    private ?Aliyun_Log_Client $client = null;
    private string $project;
    private array $logstores;

    public function __construct()
    {
        $config = config('services.sls');

        if (empty($config['endpoint']) || empty($config['access_key_id']) || empty($config['access_key_secret'])) {
            return;
        }

        $this->project = $config['project'] ?? '';

        // 解析 logstore 配置，支持逗号分隔的多个 logstore
        $logstoreConfig = $config['logstore'] ?? '';
        if (!empty($logstoreConfig)) {
            // 如果包含逗号，说明是多个 logstore
            if (str_contains($logstoreConfig, ',')) {
                $this->logstores = array_map('trim', explode(',', $logstoreConfig));
            } else {
                $this->logstores = [$logstoreConfig];
            }
        } else {
            $this->logstores = [];
        }

        $this->client = new Aliyun_Log_Client(
            $config['endpoint'],
            $config['access_key_id'],
            $config['access_key_secret'],
            $config['security_token'] ?: ''
        );
    }

    public function isConfigured(): bool
    {
        // 只要有 client、project，并且至少有一个 logstore 就算配置完成
        return $this->client !== null
            && !empty($this->project)
            && !empty($this->logstores);
    }

    /**
     * 获取配置的所有 logstore
     */
    public function getLogstores(): array
    {
        return $this->logstores;
    }

    /**
     * 获取默认的 logstore（第一个）
     */
    private function getDefaultLogstore(): string
    {
        if (empty($this->logstores)) {
            throw new RuntimeException('没有配置可用的 logstore');
        }

        return $this->logstores[0];
    }

    /**
     * 查询日志
     *
     * @param int $from 开始时间戳
     * @param int $to 结束时间戳
     * @param string|null $query SLS 查询语句
     * @param int $offset 偏移量
     * @param int $limit 返回数量
     * @param string|null $logstore 可选的 logstore，不传则使用默认
     * @return array{logs: array, count: int, complete: bool}
     */
    public function getLogs(
        int $from,
        int $to,
        ?string $query = null,
        int $offset = 0,
        int $limit = 100,
        ?string $logstore = null
    ): array {
        $this->ensureConfigured();

        $request = new Aliyun_Log_Models_GetLogsRequest(
            $this->project,
            $logstore ?? $this->getDefaultLogstore(),
            $from,
            $to,
            '',
            $query ?? '*',
            $limit,
            $offset,
            false
        );

        try {
            $response = $this->client->getLogs($request);

            $logs = [];
            foreach ($response->getLogs() as $log) {
                $logs[] = $log->getContents();
            }

            return [
                'logs' => $logs,
                'count' => $response->getCount(),
                'complete' => $response->isCompleted(),
            ];
        } catch (Aliyun_Log_Exception $e) {
            throw new RuntimeException(
                "SLS 查询失败: [{$e->getErrorCode()}] {$e->getErrorMessage()}",
                0,
                $e
            );
        }
    }

    /**
     * 获取日志分布直方图
     *
     * @param int $from 开始时间戳
     * @param int $to 结束时间戳
     * @param string|null $query SLS 查询语句
     * @param string|null $logstore 可选的 logstore
     * @return array{histograms: array, count: int, complete: bool}
     */
    public function getHistograms(
        int $from,
        int $to,
        ?string $query = null,
        ?string $logstore = null
    ): array {
        $this->ensureConfigured();

        $request = new Aliyun_Log_Models_GetHistogramsRequest(
            $this->project,
            $logstore ?? $this->getDefaultLogstore(),
            $from,
            $to,
            '',
            $query ?? '*'
        );

        try {
            $response = $this->client->getHistograms($request);

            $histograms = [];
            foreach ($response->getHistograms() as $histogram) {
                $histograms[] = [
                    'from' => $histogram->getFrom(),
                    'to' => $histogram->getTo(),
                    'count' => $histogram->getCount(),
                    'complete' => $histogram->isCompleted(),
                ];
            }

            return [
                'histograms' => $histograms,
                'count' => $response->getTotalCount(),
                'complete' => $response->isCompleted(),
            ];
        } catch (Aliyun_Log_Exception $e) {
            throw new RuntimeException(
                "SLS 直方图查询失败: [{$e->getErrorCode()}] {$e->getErrorMessage()}",
                0,
                $e
            );
        }
    }

    /**
     * 分页获取所有日志
     *
     * @param int $from 开始时间戳
     * @param int $to 结束时间戳
     * @param string|null $query SLS 查询语句
     * @param int $maxLogs 最大返回日志数
     * @param string|null $logstore 可选的 logstore
     * @return array
     */
    public function getAllLogs(
        int $from,
        int $to,
        ?string $query = null,
        int $maxLogs = 1000,
        ?string $logstore = null
    ): array {
        $allLogs = [];
        $offset = 0;
        $batchSize = 100;

        while (count($allLogs) < $maxLogs) {
            $result = $this->getLogs($from, $to, $query, $offset, $batchSize, $logstore);

            $allLogs = array_merge($allLogs, $result['logs']);

            // 如果返回的日志数量小于批次大小，说明没有更多数据了
            if (count($result['logs']) < $batchSize) {
                break;
            }

            $offset += $batchSize;
        }

        return array_slice($allLogs, 0, $maxLogs);
    }

    /**
     * 测试连接
     */
    public function testConnection(): bool
    {
        if (!$this->isConfigured()) {
            return false;
        }

        try {
            $now = time();
            $this->getLogs($now - 60, $now, '*', 0, 1);
            return true;
        } catch (\Exception $e) {
            return false;
        }
    }

    /**
     * 从多个 logstore 获取日志
     *
     * @param int $from 开始时间戳
     * @param int $to 结束时间戳
     * @param string|null $query SLS 查询语句
     * @param int $maxLogs 最大返回日志数
     * @param array|null $logstores 要查询的 logstore 列表，不传则使用配置的所有 logstore
     * @return array 按 logstore 分组的日志数据 ['logstore_name' => ['logs' => [...], 'count' => 100]]
     */
    public function getAllLogsFromMultipleStores(
        int $from,
        int $to,
        ?string $query = null,
        int $maxLogs = 1000,
        ?array $logstores = null
    ): array {
        $this->ensureConfigured();

        $targetLogstores = $logstores ?? $this->getLogstores();

        if (empty($targetLogstores)) {
            throw new RuntimeException('没有配置可用的 logstore');
        }

        $results = [];

        foreach ($targetLogstores as $logstore) {
            try {
                $logs = $this->getAllLogs($from, $to, $query, $maxLogs, $logstore);
                $results[$logstore] = [
                    'logs' => $logs,
                    'count' => count($logs),
                    'success' => true,
                ];
            } catch (\Exception $e) {
                $results[$logstore] = [
                    'logs' => [],
                    'count' => 0,
                    'success' => false,
                    'error' => $e->getMessage(),
                ];
            }
        }

        return $results;
    }

    private function ensureConfigured(): void
    {
        if (!$this->isConfigured()) {
            throw new RuntimeException('SLS 客户端未配置，请检查 .env 中的 SLS_* 配置项');
        }
    }
}