<?php
namespace App\Services;

use Illuminate\Support\Facades\Log;
use Exception;

class TcpSocketClient
{
    protected string $ip;
    protected int $port;
    protected int $timeout;

    public function __construct(string $ip, int $port, int $timeout = 5)
    {
        $this->ip = $ip;
        $this->port = $port;
        $this->timeout = $timeout;
    }

    public function send(string $data, string $breakOn = "\n"): string
    {
        $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
        if ($socket === false) {
            $err = socket_strerror(socket_last_error());
            Log::error("Socket create failed: {$err}");
            throw new Exception("Socket create failed: {$err}");
        }

        // 設定寫入超時（發送）
        socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, [
            'sec' => $this->timeout,
            'usec' => 0,
        ]);
        // 設定讀取超時（接收）
        socket_set_option($socket, SOL_SOCKET, SO_SNDTIMEO, [
            'sec' => $this->timeout,
            'usec' => 0,
        ]);

        $result = socket_connect($socket, $this->ip, $this->port);
        if ($result === false) {
            $err = socket_strerror(socket_last_error($socket));
            Log::error("Socket connect failed: {$err}");
            throw new Exception("Socket connect failed: {$err}");
        }

        $write = socket_write($socket, $data, strlen($data));
        if ($write === false) {
            $err = socket_strerror(socket_last_error($socket));
            Log::error("Socket write failed: {$err}");
            throw new Exception("Socket write failed: {$err}");
        }

        $response = '';
        while ($out = socket_read($socket, 2048)) {
            $response .= $out;
            if ($breakOn && strpos($response, $breakOn) !== false) {
                break;
            }
        }

        socket_close($socket);

        if ($response === '') {
            Log::warning('Socket read empty or timeout.');
        }

        return $response;
    }
}