//! Template project for Rust on ESP32-C3 (`no_std`) based on [`esp-hal`](https://github.com/esp-rs/esp-hal)
//!
//! Useful resources:
//! - [The Rust on ESP Book](https://docs.esp-rs.org/book/)
//! - [Embedded Rust (no_std) on Espressif](https://docs.esp-rs.org/no_std-training/)
//! - [Matrix channel](https://matrix.to/#/#esp-rs:matrix.org)

#![no_std]
#![no_main]

use esp_backtrace as _;
use esp_hal::{clock::CpuClock, delay::Delay, main, analog::adc::{AdcConfig, Attenuation, Adc}, gpio::{Output, Level}};
use log::info;
use libm::log;

const BETA: f64 = 3_950_f64; // should match the Beta Coefficient of the thermistor

#[main]
fn main() -> ! {
    esp_println::logger::init_logger_from_env();

    // Common Setup Code
    let config = esp_hal::Config::default().with_cpu_clock(CpuClock::max());
    let peripherals = esp_hal::init(config);
    let delay = Delay::new();
    // End Common Setup Code

    let analog_pin = peripherals.GPIO0;
    let mut adc_config = AdcConfig::new();
    let mut pin = adc_config.enable_pin(analog_pin, Attenuation::_11dB,);
    
    let mut adc = Adc::new(peripherals.ADC1, adc_config);

    let mut output_pins = [
      Output::new(peripherals.GPIO10, Level::Low),
      Output::new(peripherals.GPIO9, Level::Low),
      Output::new(peripherals.GPIO8, Level::Low),
      Output::new(peripherals.GPIO7, Level::Low),
      Output::new(peripherals.GPIO6, Level::Low),
      Output::new(peripherals.GPIO5, Level::Low),
      Output::new(peripherals.GPIO4, Level::Low),
      Output::new(peripherals.GPIO3, Level::Low),
      Output::new(peripherals.GPIO2, Level::Low),
      Output::new(peripherals.GPIO1, Level::Low),
    ];

    let min = -24.0_f64;
    let max = 89.0_f64;

    loop {
      let reading: f64 = nb::block!(adc.read_oneshot(&mut pin)).unwrap() as f64;
      let celsius = 1.0 / (log(1.0 / (4_095.0 / reading - 1.0)) / BETA + 1.0 / 298.15) - 273.15;
      info!("Reading: {reading}, Temp: {celsius} C");
      let leds_lit_up = (((celsius - min) / (max - min)) * (output_pins.len() + 1) as f64) as usize;
      info!("Leds Lit Up {leds_lit_up}");
      for led in &mut output_pins[..leds_lit_up] {
        led.set_high();
      }
      for led in &mut output_pins[leds_lit_up..] {
        led.set_low();
      }
      delay.delay_millis(100);
    }
}