use anyhow::{anyhow, Result};
use embedded_hal::digital::blocking::OutputPin;
use embedded_hal_0_2::adc::OneShot;
use esp_idf_hal::{
    adc::{Atten11dB, PoweredAdc, ADC1},
    gpio::{Gpio1, Gpio2},
};
use log::*;
use std::{
    sync::mpsc,
    thread,
    time::{Duration, SystemTime},
};

use crate::{beep::ringtone, dc_out_controller::DcOutController, screen::Screen};

type AdapterGpio = Gpio1<Atten11dB<ADC1>>;
type BatteryGpio = Gpio2<Atten11dB<ADC1>>;

pub struct Manager<C>
where
    C: OutputPin + Send,
{
    dc_out_controller: DcOutController<C>,
    screen: Screen,
    adc: PoweredAdc<ADC1>,
    adapter_pin: AdapterGpio,
    battery_pin: BatteryGpio,
    tx: mpsc::Sender<ringtone::Type>,
    adapter_downed_at: Option<SystemTime>,
}

impl<C> Manager<C>
where
    C: OutputPin + Send,
    C: 'static,
    C: std::marker::Sync,
{
    pub fn new(
        dc_out_controller: DcOutController<C>,
        screen: Screen,
        adc1: ADC1,
        adapter_pin: AdapterGpio,
        battery_pin: BatteryGpio,
        tx: mpsc::Sender<ringtone::Type>,
    ) -> Result<Self> {
        let adc = PoweredAdc::new(
            adc1,
            esp_idf_hal::adc::config::Config::new().calibration(true),
        )
        .map_err(|err| anyhow!("Can not init Adc: {}", err))?;
        return Ok(Manager {
            dc_out_controller,
            screen,
            adc,
            adapter_pin,
            battery_pin,
            tx,
            adapter_downed_at: None,
        });
    }

    pub fn get_adapter_voltage(&mut self) -> Result<f32> {
        return Ok(self
            .adc
            .read(&mut self.adapter_pin)
            .map_err(|err| anyhow!("Can not read adapter voltage. {:?}", err))?
            as f32);
    }
    pub fn get_battery_voltage(&mut self) -> Result<f32> {
        return Ok(self
            .adc
            .read(&mut self.battery_pin)
            .map_err(|err| anyhow!("Can not read battery voltage. {:?}", err))?
            as f32);
    }

    pub fn handling_once(&mut self) -> Result<()> {
        let mut adapter = 0.0_f32;
        let mut battery = 0.0_f32;
        for _ in 0..10 {
            adapter += self.get_adapter_voltage()?;
            battery += self.get_battery_voltage()?;
            thread::sleep(Duration::from_millis(10));
        }

        adapter /= 10.0_f32;
        battery /= 10.0_f32;

        if is_adapter_down(adapter) {
            if self.dc_out_controller.get_status().is_off() {
                self.tx
                    .send(ringtone::SILENCE)
                    .map_err(|err| anyhow!("Can not send silence to Beep. {:?}", err))?;
            } else if is_battery_down(battery) {
                self.tx
                    .send(ringtone::BATTERY_LOW)
                    .expect("Can not send message");
            } else if is_battery_low(battery) {
                self.dc_out_controller.shutdown();
                if self.adapter_downed_at.is_none() {
                    info!("Recording adapter downed at: {:?}", SystemTime::now());
                    self.adapter_downed_at = Some(SystemTime::now());
                } else if self
                    .adapter_downed_at
                    .is_some_and(|at| at.elapsed().is_ok_and(|dur| *dur > Duration::from_secs(5)))
                {
                    self.tx
                        .send(ringtone::SHUTDOWN)
                        .map_err(|err| anyhow!("Can not send shutdown to Beep. {:?}", err))?;
                }
            } else {
                self.tx
                    .send(ringtone::ADAPTER_DOWN)
                    .map_err(|err| anyhow!("Can not send adapter down to Beep. {:?}", err))?;
                self.dc_out_controller
                    .stop_shutdown()
                    .map_err(|err| anyhow!("Can not stop shutdown. {:?}", err))?;
                self.adapter_downed_at = None;
            }
        } else {
            self.dc_out_controller
                .stop_shutdown()
                .expect("Can not stop shutdown");
            self.tx.send(ringtone::SILENCE).map_err(|err| anyhow!("Can not send silence to Beep. {:?}", err))?;
            self.adapter_downed_at = None;
            self.dc_out_controller.open()?;
        }
        self.screen
            .draw_voltage(adapter, battery)
            .map_err(|err| anyhow!("Can not draw voltage. {:?}", err))?;

        Ok(())
    }
}

fn is_battery_low(battery: f32) -> bool {
    battery < 1500.0
}

fn is_battery_down(battery: f32) -> bool {
    battery < 500.0
}

fn is_adapter_down(adapter: f32) -> bool {
    adapter < 1000.0
}