// Setting up embedded environment
#![no_std]
#![no_main]

// Error handler
use esp_backtrace as _;
// Accessing the embedded hal for embedded development
use esp_hal::{
    clock::CpuClock,
    delay::Delay,
    gpio::{Io, Level, Output},
    main,
};

enum TrafficLights {
  Red,
  Amber,
  Green,
  Hold,
}

// Creating the main function
#[main]
fn main() -> ! {
  // Accessing the in built clock component
    let clocks = esp_hal::Config::default().with_cpu_clock(CpuClock::max());
    // Linking peripeharels to the clock
    let components = esp_hal::init(clocks);

    // Setting the pins i want to access
    let mut Go = Output::new(components.GPIO4, Level::Low);
    let mut Stop = Output::new(components.GPIO26, Level::Low);
    let mut SlowDown = Output::new(components.GPIO22, Level::Low);
    // If a pedestrian wants to walk because of heavy traffic
    // let mut hold = Input::new(components.GPIO2, Pull::Down);

    // Setting up a new dalay
    let delay = Delay::new();

    // Creating ticks to time the led controlls
    let mut TrafficLightStatus = TrafficLights::Red;
    let mut TrafficLightTimeDelay;

    // Looping the led
    // State transition machine controls the Traffic Lights
    // Stop => Go => SlowDown => Stop...
    loop {
      // if hold.is_low() {
      //   TrafficLightStatus = TrafficLights::Hold;
      // }
      match TrafficLightStatus {
        TrafficLights::Red => {
          Stop.set_high();
          SlowDown.set_low();
          Go.set_low();
          TrafficLightTimeDelay = 3000;
          TrafficLightStatus = TrafficLights::Green;
        },
        TrafficLights::Amber => {
          Stop.set_low();
          SlowDown.set_high();
          Go.set_low();
          TrafficLightTimeDelay = 1000;
          TrafficLightStatus = TrafficLights::Red;
        },
        TrafficLights::Green => {
          Stop.set_low();
          SlowDown.set_low();
          Go.set_high();
          TrafficLightTimeDelay = 5000;
          TrafficLightStatus = TrafficLights::Amber;
        },
        TrafficLights::Hold => {
          stop.set_high();
          SlowDown.set_high();
          go.set_high();

          TrafficLightTimeDelay = 1000;
          TrafficLightStatus = TrafficLights::Red;
        }
      }
      delay.delay_millis(TrafficLightTimeDelay);
    }
}