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use sma_rs::SMA;
use ta_common::traits::Indicator;
use ta_common::helpers::trend;
use ta_common::fixed_queue::FixedQueue;

pub struct CMO {
    period: u32,
    sma_up: SMA,
    sma_down: SMA,
    history: FixedQueue<f64>,
    prev: Option<f64>,
}


impl CMO {
    pub fn new(period: u32) -> CMO {
        Self {
            period,
            sma_up: SMA::new(period),
            sma_down: SMA::new(period),
            history: FixedQueue::new(period),
            prev: None,
        }
    }
}

impl Indicator<f64, Option<f64>> for CMO {
    fn next(&mut self, input: f64) -> Option<f64> {

        self.history.add(input);
        let res = match self.prev {
            None => None,
            Some(pre) => {
                let trend = trend(pre, input);
                self.sma_up.next(trend[0]);
                self.sma_down.next(trend[1]);
                return if self.history.is_full() {
                    let up_total=self.sma_up.get_total();
                    let down_total=self.sma_down.get_total();
                    let cmo = ((up_total - down_total) / (up_total + down_total) ) as f64 * 100.0;
                    println!("cmo:{},up_total:{},down_total:{} trendup:{} trenddown:{}", cmo, up_total, down_total, trend[0], trend[1]);
                    Some(cmo)
                } else {
                    None
                };
            }
        };
        self.prev = Some(input);
        res
    }

    fn reset(&mut self) {
        self.sma_down.reset();
        self.history.clear();
        self.sma_up.reset();
        self.prev = None;
    }
}


#[cfg(test)]
mod tests {
    use crate::CMO;
    use ta_common::traits::Indicator;

    #[test]
    fn it_works() {
        let mut cmo = CMO::new(5);
        assert_eq!(cmo.next(81.59), None);
        assert_eq!(cmo.next(81.06), None);
        assert_eq!(cmo.next(82.87), None);
        assert_eq!(cmo.next(83.00), None);
        assert_eq!(cmo.next(83.61), Some(79.77099236641216));
        assert_eq!(cmo.next(83.15), Some(84.4117647058823));
        assert_eq!(cmo.next(82.84), Some(100.0));
        assert_eq!(cmo.next(83.99), Some(100.0));
        assert_eq!(cmo.next(84.55), Some(100.0));
        assert_eq!(cmo.next(84.36), Some(100.0));
        assert_eq!(cmo.next(85.53), Some(100.0));
        assert_eq!(cmo.next(86.54), Some(100.0));
        assert_eq!(cmo.next(86.89), Some(100.0));
        assert_eq!(cmo.next(87.77), Some(100.0));
        assert_eq!(cmo.next(87.29), Some(100.0));
    }
}