#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>

// open ssl
#include <openssl/conf.h>
#include <openssl/evp.h>
#include <openssl/err.h>

#include <errno.h>  // error handling
#include <unistd.h> // for close()

#include <string>
#include <cstring>
#include <cstdlib> // for atoi()
#include <vector>

#include "helper.h"

int main(void)
{
    load_env(".env");
    // Declare variables
    const char *server_ip = std::getenv("SERVER_IP");
    const int server_port = std::atoi(std::getenv("SERVER_PORT"));
    printf("Connecting to server %s:%d\n", server_ip, server_port);

    char client_message[1024];
    char server_message[1024];
    const char *custom_message = "Zheyuan Wu: ";

    // Create socket:
    int client_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (client_socket == -1)
    {
        perror("Failed to create socket");
        return 1;
    }
    else
    {
        printf("Socket created successfully\n");
    }

    // Send connection request to server, be sure to set por tand IP the same as server-side
    struct sockaddr_in server_addr;
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(server_port);
    inet_pton(AF_INET, server_ip, &server_addr.sin_addr);

    if (connect(client_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1)
    {
        perror("Failed to connect to server");
        close(client_socket);
        return 1;
    }
    else
    {
        printf("Connected to server successfully\n");
    }

    // Get input from the user:
    printf("Enter message sent to the server (type \\quit to exit): ");
    // clean the buffer
    memset(client_message, 0, sizeof(client_message));
    if (fgets(client_message, sizeof(client_message), stdin) == NULL)
    {
        // EOF or error reading from stdin, exit the loop
        perror("Error reading from stdin");
        return 1;
    }

    while (strcmp(client_message, "\\quit\n") != 0)
    {

        // Send the message to server:
        // add my name in the front
        char buffer[2048];
        std::snprintf(buffer, sizeof(buffer), "%s%s", custom_message, client_message);
        printf("Message sent to server: %s, length: %d \n", byte_to_hex((unsigned char *)buffer, strlen(buffer)), (int)strlen(buffer));

        ssize_t sent = send(client_socket, buffer, strlen(buffer), 0);
        if (sent <= 0)
        {
            perror("No message sent to server");
            break;
        }
        // send hmac of the message
        unsigned char hmac[20];
        memset(hmac, 0, sizeof(hmac));
        cal_hmac(hmac, buffer);
        printf("HMAC sent to server: %s\n", byte_to_hex(hmac, 20));

        ssize_t sent_hmac = send(client_socket, hmac, strlen((char *)hmac), 0);
        if (sent_hmac <= 0)        {
            perror("No HMAC sent to server");
            break;
        }

        // Receive the server's response:
        // add terminator for string
        ssize_t recvd = recv(client_socket, server_message, sizeof(server_message) - 1, 0);
        if (recvd <= 0)
        {
            perror("No message received from server");
            break;
        }
        server_message[recvd] = '\0';

        printf("Server's response: %s\n", server_message);

        printf("Enter message sent to the server (type \\quit to exit): ");

        // clean the buffer
        memset(client_message, 0, sizeof(client_message));
        memset(server_message, 0, sizeof(server_message));

        if (fgets(client_message, sizeof(client_message), stdin) == NULL)
        {
            // EOF or error reading from stdin, exit the loop
            perror("Error reading from stdin");
            break;
        }
    }

    // Close the socket
    close(client_socket);

    return 0;
}