use crate::config::{self, PlantControllerConfig, 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<f32, TankError> {
        match self {
            TankState::TankSensorDisabled => Err(TankError::SensorDisabled),
            TankState::TankSensorPresent(raw_value_mv) => {
                let tank_fill_percent = raw_voltage_to_tank_fill_percent(raw_value_mv, config)?;
                //TODO(judge) move logging to more sensible place
                //println!(
                    //"Tank sensor returned mv {} as {}% leaving {} ml useable",
                    //rv.raw, percent as u8, rv.left_ml
                //);
                Ok(config.tank_useable_ml as f32 * tank_fill_percent / 100.)
            }
        }
    }
    pub fn enough_water(&self, config: &TankConfig) -> Result<bool, TankError> {
        match self {
            TankState::TankSensorDisabled => Err(TankError::SensorDisabled),
            TankState::TankSensorPresent(raw_value_mv) => {
                let tank_fill_percent = raw_voltage_to_tank_fill_percent(raw_value_mv, config)?;
                if tank_fill_percent > config.tank_empty_percent {
                    //TODO(judge) move logging to more sensible place
                    //println!(
                        //"Enough water, current percent is {}, minimum empty level is {}",
                        //percent as u8, config.tank.tank_empty_percent
                    //);
                    Ok(true)
                } else {
                    Ok(false)
                }
            },
        }
    }

    pub fn warn_level(&self, config: &TankConfig) -> Result<bool, TankError> {
        match self {
            TankState::TankSensorDisabled => Err(TankError::SensorDisabled),
            TankState::TankSensorPresent(raw_value_mv) => {
                let tank_fill_percent = raw_voltage_to_tank_fill_percent(raw_value_mv, config)?;
                if tank_fill_percent < config.tank_warn_percent {
                    //TODO(judge) move logging to more sensible place
                    //println!(
                        //"Low water, current percent is {}, minimum warn level is {}",
                        //percent as u8, config.tank.tank_warn_percent
                    //);
                    // TODO(judge) move board fault setting
                    // board.general_fault(true);
                    Ok(true)
                } else {
                    Ok(false)
                }
            },
        }
    }
}

#[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,
) -> TankState {
    if config.tank.tank_sensor_enabled {
        let raw_sensor_value_mv = board.tank_sensor_voltage();
        TankState::TankSensorPresent(raw_sensor_value_mv)
    } else {
        TankState::TankSensorDisabled
    }
}