use esp_idf_sys as _; // If using the `binstart` feature of `esp-idf-sys`, always keep this module imported
use esp_idf_sys::EspError;
use esp_idf_sys::esp;

use esp_idf_hal::rmt;
use esp_idf_hal::peripherals::Peripherals;


use std::thread::sleep;
use std::time::Duration;



fn led_tx(tx: &mut rmt::TxRmtDriver, data: &Vec<u8>) -> Result<(), EspError>  {
    use esp_idf_hal::rmt::Signal;
    use esp_idf_sys::rmt_item32_t;

    let bit1: [rmt::Pulse; 2] = [
        rmt::Pulse::new(rmt::PinState::High, rmt::PulseTicks::new(34).unwrap()),
        rmt::Pulse::new(rmt::PinState::Low,  rmt::PulseTicks::new(16).unwrap()),
    ];
                
    let bit0: [rmt::Pulse; 2] = [
        rmt::Pulse::new(rmt::PinState::High, rmt::PulseTicks::new(16).unwrap()),
        rmt::Pulse::new(rmt::PinState::Low,  rmt::PulseTicks::new(34).unwrap()),
    ];

    let mut signal = rmt::VariableLengthSignal::with_capacity(data.len() * 16);
    for v in data {
            
        for i in 0..u8::BITS {
            if v & (0b1000_0000 >> i) != 0 {
                signal.push(&bit1).unwrap();
            } else {
                signal.push(&bit0).unwrap();
            }
        }
    }
    tx.start_blocking(&signal)?;
    
    Ok(())
}

fn make_color(idx: u32) -> [u8; 3] {
  let clr = (idx % 255) as u8;
  let chn = idx / 255 % 3 as u32;
  match chn % 3{
    0 => [255 - clr, clr, 0],
    1 => [0, 255 - clr, clr],
    2 => [clr, 0, 255 - clr],
    _ => todo!(),
  }
}

fn main() {
    esp_idf_sys::link_patches();
    println!("Hello, world!");

    let config = rmt::config::TransmitConfig::new().mem_block_num(3).clock_divider(2);

    let peripherals = Peripherals::take().unwrap();
    let channel = peripherals.rmt.channel0;
    let pin = peripherals.pins.gpio21;

    // Create an RMT transmitter.
    let mut tx = rmt::TxRmtDriver::new(channel, pin, &config).unwrap();
    
    loop {

      for i in 0..9945 {
        let i = i * 13;
        let led = (i..(i+16)).flat_map(|v| make_color(v + (v - i) * 48)).collect();
        led_tx(&mut tx, &led).unwrap();
        sleep(Duration::from_micros(100));
      }

    }
       

    loop {}
}