/**
 * @brief Command line processing callback function
 * @param[in] session Handle referencing an SCP session
 * @param[in] user NULL-terminated string that contains the user name
 * @param[in] path Canonical path of the file
 * @return Permissions for the specified file
 **/

error_t shellServerCommandLineCallback(ShellServerSession *session,
                                       char_t *commandLine) {
    error_t error;

    // Debug message
    TRACE_INFO("Shell server: Command line received\r\n");
    TRACE_INFO("  %s\r\n", commandLine);

    // Flag to control the continuous UART communication loop
    bool exitLoop = false;

    // Check command name
    if (!strcasecmp(commandLine, "hello")) {
        // Send response to the client
        error = shellServerWriteStream(session, "Hello World!\r\n", 14,
                                       NULL, 0);

        // UART output: Sending a hello message
        UARTCharPut(UART0_BASE, 'S');
        UARTCharPut(UART0_BASE, 'e');
        UARTCharPut(UART0_BASE, 'n');
        UARTCharPut(UART0_BASE, 'd');
        UARTCharPut(UART0_BASE, 'i');
        UARTCharPut(UART0_BASE, 'n');
        UARTCharPut(UART0_BASE, 'g');
        UARTCharPut(UART0_BASE, ' ');
        UARTCharPut(UART0_BASE, 'H');
        UARTCharPut(UART0_BASE, 'e');
        UARTCharPut(UART0_BASE, 'l');
        UARTCharPut(UART0_BASE, 'l');
        UARTCharPut(UART0_BASE, 'o');
        UARTCharPut(UART0_BASE, ' ');
        UARTCharPut(UART0_BASE, 'W');
        UARTCharPut(UART0_BASE, 'o');
        UARTCharPut(UART0_BASE, 'r');
        UARTCharPut(UART0_BASE, 'l');
        UARTCharPut(UART0_BASE, 'd');
        UARTCharPut(UART0_BASE, '!');
        UARTCharPut(UART0_BASE, '\r');
        UARTCharPut(UART0_BASE, '\n');

        // Continuous UART communication loop
        while (!exitLoop) {
            if (UARTCharsAvail(UART0_BASE)) {
                char receivedChar = UARTCharGet(UART0_BASE);

                // Check for exit command
                if (receivedChar == 'e' || receivedChar == 'E') {
                    // Check if the next characters match "exit" or "quit"
                    char nextChar1 = UARTCharGet(UART0_BASE);
                    char nextChar2 = UARTCharGet(UART0_BASE);
                    if ((nextChar1 == 'x' || nextChar1 == 'X') &&
                        (nextChar2 == 'i' || nextChar2 == 'I') &&
                        (UARTCharGet(UART0_BASE) == 't' || UARTCharGet(UART0_BASE) == 'T')) {
                        // Exit the loop
                        exitLoop = true;
                        break; // Exit the loop immediately
                    }
                }

                // Echo the received character back to UART
                UARTCharPut(UART0_BASE, receivedChar);

                // Relay UART input to SSH server
                shellServerWriteStream(session, &receivedChar;, 1, NULL, 0);
                }
              }
    } else if (!strcasecmp(commandLine, "exit") || !strcasecmp(commandLine, "quit")) {
        // Close shell session
        error = ERROR_END_OF_STREAM;
    } else {
        // Unknown command received
        error = shellServerWriteStream(session, "Unknown command!\r\n", 18,
                                       NULL, 0);
    }

    // Return status code
    return error;
}