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use async_trait::async_trait;
use log::warn;
use serde::{Deserialize, Deserializer};
use std::collections::HashMap;
use std::fmt::{Display, Formatter};

pub mod database;
pub mod dummy;
pub mod file;

#[derive(Debug, PartialEq, Eq, Hash, Clone)]
pub enum Sensor {
    TKTP,
    TKEN,
    TKEX,
    TKBT,
    HPFL,
    HPRT,
    TKFL,
    TKRT,
    HXOF,
    HXOR,
    HXIF,
    HXIR,
    Other(SensorId),
}

impl Display for Sensor {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        if let Sensor::Other(id) = &self {
            return write!(f, "{}", id.id);
        }
        write!(f, "{:?}", &self)
    }
}

impl From<&str> for Sensor {
    fn from(s: &str) -> Self {
        let lower = s.to_ascii_lowercase();
        match lower.as_str() {
            "tktp" => Sensor::TKTP,
            "tken" => Sensor::TKEN,
            "tkex" => Sensor::TKEX,
            "tkbt" => Sensor::TKBT,
            "hprt" => Sensor::HPRT,
            "hpfl" => Sensor::HPFL,
            "tkfl" => Sensor::TKFL,
            "tkrt" => Sensor::TKRT,
            "hxof" => Sensor::HXOF,
            "hxor" => Sensor::HXOR,
            "hxif" => Sensor::HXIF,
            "hxir" => Sensor::HXIR,
            _ => Sensor::Other(SensorId::new(lower)),
        }
    }
}

impl<'de> Deserialize<'de> for Sensor {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        let sensor = String::deserialize(deserializer)?.as_str().into();
        if let Sensor::Other(v) = &sensor {
            warn!(
                "Warning, custom sensor id: {} specified somewhere in config.",
                v
            );
        }
        Ok(sensor)
    }
}

#[derive(Debug, PartialEq, Eq, Hash, Clone)]
pub struct SensorId {
    id: String,
}

impl SensorId {
    /// If looking to construct a sensor, use Sensor::from()
    fn new(id: String) -> SensorId {
        assert!(id.is_ascii(), "Id must be ascii");
        SensorId {
            id: id.to_ascii_lowercase(),
        }
    }
}

impl Display for SensorId {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.id)
    }
}

#[async_trait]
pub trait TemperatureManager {
    async fn retrieve_sensors(&mut self) -> Result<(), String>;

    async fn retrieve_temperatures(&self) -> Result<HashMap<Sensor, f32>, String>;
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::io::temperatures::Sensor::Other;

    #[test]
    fn sanity() {
        let sensors = [
            Sensor::TKTP,
            Sensor::TKEN,
            Sensor::TKEX,
            Sensor::TKBT,
            Sensor::HPFL,
            Sensor::HPRT,
            Sensor::TKFL,
            Sensor::TKRT,
            Sensor::HXOF,
            Sensor::HXOR,
            Sensor::HXIF,
            Sensor::HXIR,
            Other(SensorId::new("dumb_sensor".to_owned())),
        ];
        for sensor in sensors {
            let same_sensor = sensor.to_string().as_str().into();
            assert_eq!(
                &sensor, &same_sensor,
                "Expected sensor '{}' to transform back into itself.",
                sensor
            );
        }
    }
}