#![no_std]
#![no_main]

use neokey_trinkey as bsp;

#[cfg(not(feature = "use_semihosting"))]
use panic_halt as _;

#[cfg(feature = "use_semihosting")]
use panic_semihosting as _;

use bsp::entry;
use bsp::hal;
use hal::clock::GenericClockController;
use hal::delay::Delay;
use hal::pac::{CorePeripherals, Peripherals};
use hal::prelude::*;
use hal::timer::TimerCounter;

use smart_leds::{brightness, hsv::RGB8, SmartLedsWrite};
use ws2812_timer_delay::Ws2812;

#[entry]
fn main() -> ! {
    let mut peripherals = Peripherals::take().unwrap();
    let core = CorePeripherals::take().unwrap();
    let mut clocks = GenericClockController::with_internal_32kosc(
        peripherals.GCLK,
        &mut peripherals.PM,
        &mut peripherals.SYSCTRL,
        &mut peripherals.NVMCTRL,
    );

    let pins = bsp::Pins::new(peripherals.PORT);

    let gclk0 = clocks.gclk0();
    let timer_clock = clocks.tcc2_tc3(&gclk0).unwrap();
    let mut timer = TimerCounter::tc3_(&timer_clock, peripherals.TC3, &mut peripherals.PM);
    timer.start(3.mhz());
    let neo_pixel = pins.neo_pixel.into_push_pull_output();
    let mut ws2812 = Ws2812::new(timer, neo_pixel);

    let mut delay = Delay::new(core.SYST, &mut clocks);

    let mut data;

    loop {
        for j in 0..(256 * 5) {
            data = wheel(((j as u16) & 255) as u8);
            ws2812
                .write(brightness([data].iter().cloned(), 32))
                .unwrap();
            delay.delay_ms(2u8);
        }
    }
}

/// Input a value 0 to 255 to get a color value
/// The colours are a transition r - g - b - back to r.
fn wheel(mut wheel_pos: u8) -> RGB8 {
    wheel_pos = 255 - wheel_pos;
    if wheel_pos < 85 {
        return (255 - wheel_pos * 3, 0, wheel_pos * 3).into();
    }
    if wheel_pos < 170 {
        wheel_pos -= 85;
        return (0, wheel_pos * 3, 255 - wheel_pos * 3).into();
    }
    wheel_pos -= 170;
    (wheel_pos * 3, 255 - wheel_pos * 3, 0).into()
}