#![no_std]
#![no_main]
// original source:
// https://esp32.implrust.com/lcd/index.html

use embassy_executor::Spawner;
use embassy_time::{Duration, Timer};
use esp_hal::clock::CpuClock;
use esp_hal::timer::timg::TimerGroup;
use hd44780_driver::memory_map::MemoryMap1602;
use hd44780_driver::setup::DisplayOptionsI2C;
use hd44780_driver::HD44780;

#[panic_handler]
fn panic(_: &core::panic::PanicInfo) -> ! {
    loop {}
}

#[esp_hal_embassy::main]
async fn main(spawner: Spawner) {
    // generator version: 0.3.1

    let config = esp_hal::Config::default().with_cpu_clock(CpuClock::max());
    let peripherals = esp_hal::init(config);

    let timer0 = TimerGroup::new(peripherals.TIMG1);
    esp_hal_embassy::init(timer0.timer0);

    // TODO: Spawn some tasks
    let _ = spawner;

    let i2c_bus =
        esp_hal::i2c::master::I2c::new(peripherals.I2C0, esp_hal::i2c::master::Config::default())
            .unwrap()
            .with_scl(peripherals.GPIO18)
            .with_sda(peripherals.GPIO23)
            .into_async();

    let i2c_address = 0x27;
    let Ok(mut lcd) = HD44780::new(
        DisplayOptionsI2C::new(MemoryMap1602::new()).with_i2c_bus(i2c_bus, i2c_address),
        &mut embassy_time::Delay,
    ) else {
        panic!("failed to initialize display");
    };

    // Unshift display and set cursor to 0
    lcd.reset(&mut embassy_time::Delay).unwrap();

    // Clear existing characters
    lcd.clear(&mut embassy_time::Delay).unwrap();

    // Display the following string
    lcd.write_str("impl Rust", &mut embassy_time::Delay)
        .unwrap();

    // Move the cursor to the second line
    lcd.set_cursor_xy((0, 1), &mut embassy_time::Delay).unwrap();

    // Display the following string on the second line
    lcd.write_str("Hello, Ferris!", &mut embassy_time::Delay)
        .unwrap();

    loop {
        Timer::after(Duration::from_secs(1)).await;
    }
}