extern "C" {
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
}

#include <expected>
#include <string>
#include <vector>
#include <span>
#include <iostream>

#include <tcpclient.hpp>

TCPClient::TCPClient() {
        sock = 0;
}

std::expected<void, std::string> TCPClient::conn(const std::string address, const int port) {
        sock = socket(AF_INET, SOCK_STREAM, 0);
        if (sock < 0) {
                return std::unexpected("Error opening socket");
        }
        struct sockaddr_in serv_addr;
        memset(&serv_addr, 0, sizeof(serv_addr));

        serv_addr.sin_family = AF_INET;
        serv_addr.sin_port = htons(port);
        const char* addr = address.data();
        if (inet_pton(AF_INET, addr, &serv_addr.sin_addr) <= 0) {
                return std::unexpected("Invalid server IP address");
        }

        struct timeval timeout;
        timeout.tv_sec = 3;
        timeout.tv_usec = 0;

        if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof timeout) < 0) {
                return std::unexpected("Set timeout error");
        }
        if (setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof timeout) < 0) {
                return std::unexpected("Set timeout error");
        }
        if (connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) < 0) {
                return std::unexpected("Connecting error");
        }
        return {};
}


std::expected<int, std::string> TCPClient::writeBytes(std::span<const std::byte> payload) {
        int n = 0;
        if ((n = write(sock, payload.data(), payload.size())) < 0) {
                return std::unexpected("Write error");
        }
        return n;
}

std::expected<int, std::string> TCPClient::writeBytes(std::string payload) {
        int n = 0;
        if ((n = write(sock, payload.data(), payload.size())) < 0) {
                return std::unexpected("Write error");
        }
        return n;
}

std::expected<int, std::string> TCPClient::readBytes(std::vector<std::byte>* buffer) {
        int n = 0;
        if ((n = read(sock, buffer->data(), buffer->size())) < 0) {
                return std::unexpected("Read error");
        }
        return n;
}

std::expected<int, std::string> TCPClient::readBytes(std::vector<uint8_t>* buffer) {
        return read(sock, buffer->data(), buffer->size());
}