#!/bin/bash

DEVICE=/dev/ttyOUT2
BAUD=115200

# Function to setup device communication parameters
setup_device() {
    stty -F $DEVICE cs8 $BAUD ignbrk -brkint -icrnl -imaxbel \
        -opost -onlcr -isig -icanon -iexten -echo -echoe -echok \
        -echoctl -echoke noflsh -ixon -crtscts
}

# Function to send AT command and capture the output
send_at_command() {
    local command="$1"
    
    # Clear the device buffer before sending a new command
    echo -n > $DEVICE

    # Send the AT command, preserving the integrity of the input
    echo -e "$command\r" > $DEVICE

    # Use a temporary file to capture the command output
    tmpfile=$(mktemp)
    
    # Start reading the device output to the temporary file
    cat $DEVICE > "$tmpfile" &
    CAT_PID=$!

    # Monitor the output file for "OK" or "ERROR"
    while ! grep -qe "OK" -e "ERROR" "$tmpfile"; do
        sleep 1
    done

    # Kill the `cat` process after capturing the response
    kill $CAT_PID
    wait $CAT_PID 2>/dev/null

    # Display the response
    cat "$tmpfile" | while IFS= read -r line; do
        echo -e "\033[0;32m$line\033[0m"
    done

    # Clean up
    rm "$tmpfile"
}

# Prepare the device for communication
setup_device

# Check if an AT command is provided as an argument
if [ $# -gt 0 ]; then
    # Concatenate all arguments to handle commands with spaces and/or quotes correctly
    FULL_CMD="$*"
    send_at_command "$FULL_CMD"
else
    echo -e "\033[0;36mType 'exit' to end the session.\033[0m"
    while true; do
        echo -en "\033[0;36mEnter AT Command: \033[0m"
        read user_input

        if [[ "$user_input" == "exit" ]]; then
            echo -e "\033[0;32mExiting...\033[0m"
            break
        fi

        send_at_command "$user_input"
    done
fi