const { exec } = require('child_process');

// List of pins for toggling
const togglePins = [7, 13];
// List of pins for sensing
const sensePins = [16, 22];

// Function to toggle a pin on-then-off
function togglePin(pin, callback) {
    exec(`python3 src/python/gpio_interface.py toggle ${pin}`, (error, stdout, stderr) => {
        if (error) {
            console.error(`Error toggling pin ${pin}: ${error.message}`);
            return callback(error);
        }
        if (stderr) {
            console.error(`Stderr while toggling pin ${pin}: ${stderr}`);
            return callback(new Error(stderr));
        }
        console.log(`Successfully toggled pin ${pin}`);
        // Wait for 1 second before turning it off
        setTimeout(() => {
            exec(`python3 gpio_control.py toggle ${pin}`, (error, stdout, stderr) => {
                if (error) {
                    console.error(`Error turning off pin ${pin}: ${error.message}`);
                    return callback(error);
                }
                if (stderr) {
                    console.error(`Stderr while turning off pin ${pin}: ${stderr}`);
                    return callback(new Error(stderr));
                }
                console.log(`Successfully turned off pin ${pin}`);
                callback(null);
            });
        }, 1000); // 1-second delay to ensure the pin is toggled
    });
}

// Function to sense a pin state
function sensePin(pin, callback) {
    exec(`python3 gpio_control.py sense ${pin}`, (error, stdout, stderr) => {
        if (error) {
            console.error(`Error sensing pin ${pin}: ${error.message}`);
            return callback(error);
        }
        if (stderr) {
            console.error(`Stderr while sensing pin ${pin}: ${stderr}`);
            return callback(new Error(stderr));
        }
        console.log(`Pin ${pin} state: ${stdout.trim()}`);
        callback(null);
    });
}

// Toggle pins sequentially and then sense pin states
function controlPins() {
    let index = 0;

    // Toggle all pins
    function toggleNextPin() {
        if (index >= togglePins.length) {
            console.log('All toggle pins processed.');
            // Proceed to sensing pins
            senseNextPin();
        } else {
            togglePin(togglePins[index], (err) => {
                if (err) {
                    process.exit(1); // Exit with error
                } else {
                    index++;
                    toggleNextPin();
                }
            });
        }
    }

    // Sense all pins
    function senseNextPin() {
        index = 0;
        function sensePinNext() {
            if (index >= sensePins.length) {
                console.log('All sense pins processed.');
                process.exit(0); // Exit successfully
            } else {
                sensePin(sensePins[index], (err) => {
                    if (err) {
                        process.exit(1); // Exit with error
                    } else {
                        index++;
                        sensePinNext();
                    }
                });
            }
        }
        sensePinNext();
    }

    // Start with toggling pins
    toggleNextPin();
}

// Start the process
controlPins();