use std::collections::HashMap;
use std::time::Duration;

#[derive(RustcDecodable, RustcEncodable, Debug, Clone)]
pub struct Params {
    pub fridge_setpoint: f32,
    pub fridge_difference: f32,
    pub overshoot_delay: u32,
    pub overshoot_factor: f32,
    pub disabled: bool,
    pub nowort: bool,
    pub fridge_range_lower: f32,
    pub fridge_range_upper: f32,
}

impl Params {
    pub fn defaults() -> Params {
        Params {
            fridge_setpoint: 16.0,
            fridge_difference: 0.2,
            overshoot_delay: 720, // 12 minutes
            overshoot_factor: 1.0,
            disabled: false,
            nowort: false,
            fridge_range_lower: 3.0,
            fridge_range_upper: 3.0,
            }
    }
}

#[derive(Debug)]
pub struct ParamHolder {
    pub p: Params,
    epoch: String, // XXX or a byte array?
}

impl ParamHolder {
    pub fn new() -> ParamHolder {
        ParamHolder {
            p: Params::defaults(),
            epoch: String::new(),
        }
    }
}

#[derive(Debug)]
pub struct Readings {
    temps: HashMap<String, Option<f32>>,
}

impl Readings {
    pub fn new() -> Readings {
        Readings {
            temps: HashMap::new(),
        }
    }

    pub fn add(&mut self, name: &str, v: Option<f32>) {
        if let Some(prev) = self.temps.insert(name.to_string(), v) {
            warn!("Replaced existing reading '{}' {:?} -> {:?}",
                name, prev, v);
        }
    }

    pub fn fridge(&self) -> Option<f32> {
        if let Some(t) = self.temps.get("fridge") {
            t.clone()
        } else {
            warn!("No fridge reading was added");
            None
        }
    }

    pub fn wort(&self) -> Option<f32> {
        if let Some(t) = self.temps.get("wort") {
            t.clone()
        } else {
            warn!("No wort reading was added");
            None
        }
    }
}