//! Blinks an LED when button GPIO is pulled high
//!
//! This assumes that a LED is connected to the pin assigned to `led`. (GPIO4)

#![no_std]
#![no_main]

// use esp_idf_sys as _; // If using the `binstart` feature of `esp-idf-sys`, always keep this module imported
use esp_backtrace as _;
use esp_println::println;
use hal::{
    clock::ClockControl,
    gpio::IO,
    peripherals::Peripherals,
    prelude::*, 
    timer::TimerGroup, Delay,
    Rtc,
};

#[entry]
fn main() -> ! {
    let peripherals = Peripherals::take();
    let mut system = peripherals.SYSTEM.split();
    let clocks = ClockControl::boot_defaults(system.clock_control).freeze();

    // Disable the RTC and TIMG watchdog timers
    let mut rtc = Rtc::new(peripherals.RTC_CNTL);
    let timer_group0 = TimerGroup::new(peripherals.TIMG0, &clocks);
    let mut wdt0 = timer_group0.wdt;
    let timer_group1 = TimerGroup::new(peripherals.TIMG1, &clocks);
    let mut wdt1 = timer_group1.wdt;
    rtc.rwdt.disable();
    wdt0.disable();
    wdt1.disable();
    println!("Hello world!");

    // Get GPIO
    let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
    // Set GPIO4 as an output
    let mut led = io.pins.gpio4.into_push_pull_output();
    // Set GPIO2 as an input
    let mut btn = io.pins.gpio2.into_pull_down_input().degrade();
    
    // Set LED low initially
    led.set_low().unwrap();

    // Initialize the Delay peripheral, and use it to toggle the LED state in a
    // loop.
    let mut delay = Delay::new(&clocks);

    // TODO: Detect button press with interrupt instead. 
    // see: https://esp-rs.github.io/book/writing-your-own-application/no-std-applications/interrupt.html
    loop {
        if btn.is_high().unwrap() {
            esp_println::println!("Button\r");
            //led.toggle().unwrap();
            led.set_high().unwrap();
        } else {
            led.set_low().unwrap();
        }
        
         delay.delay_ms(500u32);
    }
}