use crate::config::TankConfig;

const OPEN_TANK_VOLTAGE: f32 = 3.0;

#[derive(Debug, PartialEq, Default)]
/// State data for water tank
///
/// TODO unify with TankStateMQTT
pub struct TankInfo {
    /// is there enough water in the tank
    enough_water: bool,
    /// warning that water needs to be refilled soon
    warn_level: bool,
    /// estimation how many ml are still in tank
    left_ml: u32,
    /// if there is was an issue with the water level sensor
    /// TODO merge with left_ml as Result<u32, error_type>
    sensor_error: bool,
    /// raw water sensor value
    raw: u16,
}

pub enum TankError {
    SensorDisabled,
    SensorMissing(f32),
    SensorValueError { value: f32, min: f32, max: f32 },
}

pub enum TankState {
    TankSensorPresent(u16),
    TankSensorDisabled,
}

fn raw_volatge_to_divider_percent(raw_value_mv: u16) -> Result<f32, TankError> {
    if raw_value_mv > OPEN_TANK_VOLTAGE {
        return Err(TankError::SensorMissing(raw_value_mv));
    }

    let r2 = raw_value_mv * 50.0 / (3.3 - raw_value_mv);
    let mut percent = r2 / 190_f32 * 100_f32;
    percent = percent.clamp(0.0, 100.0);
    // TODO(judge) move this to a sensible place
    //log(
    //LogMessage::SensorTankRaw,
    //raw_value_mv as u32,
    //percent as u32,
    //"",
    //"",
    //);
    Ok(percent)
}

fn raw_voltage_to_tank_fill_percent(
    raw_value_mv: u16,
    config: &TankConfig,
) -> Result<f32, TankError> {
    let divider_percent = raw_volatge_to_divider_percent(raw_value_mv)?;
    if s < config.tank_empty_percent || s > config.tank_full_percent {
        return Err(TankError::SensorValueError {
            value: divider_percent,
            min: config.tank_empty_percent,
            max: config.tank_full_percent,
        });
    }
    Ok((divider_percent - config.tank_empty_percent) * 100
        / (config.tank_full_percent - config.tank_empty_percent))
}


impl TankState {
    pub fn left_ml(&self, config: &TankConfig) -> Result<u32, TankError> {
        match self {
            TankState::TankSensorDisabled => Err(TankError::SensorMissing),
            TankState::TankSensorPresent(raw_value_mv) => {
                let tank_fill_percent = raw_voltage_to_tank_fill_percent(raw_value_mv, config);
                todo!()
            }
        }
    }
}

#[derive(Serialize)]
pub struct TankStateMQTT {
    enough_water: bool,
    warn_level: bool,
    left_ml: u32,
    sensor_error: bool,
    raw: u16,
    water_frozen: String,
}

pub fn determine_tank_state(
    board: &mut std::sync::MutexGuard<'_, PlantCtrlBoard<'_>>,
    config: &PlantControllerConfig,
) -> TankInfo {
    if config.tank.tank_sensor_enabled {
        let mut rv: TankInfo = TankInfo {
            ..Default::default()
        };
        let success = board
            .tank_sensor_percent()
            .and_then(|raw| {
                rv.raw = raw;
                return map_range(
                    (
                        config.tank.tank_empty_percent as f32,
                        config.tank.tank_full_percent as f32,
                    ),
                    raw as f32,
                );
            })
            .and_then(|percent| {
                rv.left_ml = ((percent * config.tank.tank_useable_ml as f32) / 100_f32) as u32;
                println!(
                    "Tank sensor returned mv {} as {}% leaving {} ml useable",
                    rv.raw, percent as u8, rv.left_ml
                );
                if config.tank.tank_warn_percent > percent as u8 {
                    board.general_fault(true);
                    println!(
                        "Low water, current percent is {}, minimum warn level is {}",
                        percent as u8, config.tank.tank_warn_percent
                    );
                    rv.warn_level = true;
                }
                if config.tank.tank_empty_percent < percent as u8 {
                    println!(
                        "Enough water, current percent is {}, minimum empty level is {}",
                        percent as u8, config.tank.tank_empty_percent
                    );
                    rv.enough_water = true;
                }
                return Ok(());
            });
        match success {
            Err(err) => {
                println!("Could not determine tank value due to {}", err);
                board.general_fault(true);
                rv.sensor_error = true;
            }
            Ok(_) => {}
        }
        return rv;
    }
    return TankInfo {
        warn_level: false,
        enough_water: true,
        left_ml: 1337,
        sensor_error: false,
        raw: 0,
    };
}