#![no_std]
#![no_main]

use panic_halt as _;

use embedded_graphics::mono_font::{
    ascii::FONT_5X8,
    MonoTextStyleBuilder,
};
use embedded_graphics::pixelcolor::Rgb565;
use embedded_graphics::prelude::*;
use embedded_graphics::primitives::{Rectangle, PrimitiveStyle};
use embedded_graphics::text::Text;
use longan_nano::hal::{pac, prelude::*};
use longan_nano::{lcd, lcd_pins};
use riscv_rt::entry;

#[entry]
fn main() -> ! {
    let dp = pac::Peripherals::take().unwrap();

    // Configure clocks
    let mut rcu = dp
        .RCU
        .configure()
        .ext_hf_clock(8.mhz())
        .sysclk(108.mhz())
        .freeze();
    let mut afio = dp.AFIO.constrain(&mut rcu);

    let gpioa = dp.GPIOA.split(&mut rcu);
    let gpiob = dp.GPIOB.split(&mut rcu);

    let lcd_pins = lcd_pins!(gpioa, gpiob);
    let mut lcd = lcd::configure(dp.SPI0, lcd_pins, &mut afio, &mut rcu);
    let (width, height) = (lcd.size().width as i32, lcd.size().height as i32);

    // Clear screen
    Rectangle::new(Point::new(0, 0), Size::new(width as u32, height as u32))
        .into_styled(PrimitiveStyle::with_fill(Rgb565::BLACK))
        .draw(&mut lcd)
        .unwrap();

    let style = MonoTextStyleBuilder::new()
        .font(&FONT_5X8)
        .text_color(Rgb565::BLACK)
        .background_color(Rgb565::GREEN)
        .build();

    // Create a text at position (20, 30) and draw it using style defined above
    Text::new(" Hello Rust! ", Point::new(40, 35), style)
        .draw(&mut lcd)
        .unwrap();

    loop {}
}