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use crate::ADX;
use ta_common::fixed_queue::FixedQueue;
use ta_common::traits::Indicator;
#[doc(include = "../docs/adxr.md")]
pub struct ADXR {
    period: u32,
    adx: ADX,
    adx_history: FixedQueue<f64>,

}

impl ADXR {
    pub fn new(period: u32) -> ADXR {
        Self {
            adx: ADX::new(period),
            adx_history: FixedQueue::new(period),
            period,
        }
    }
}

impl Indicator<[f64; 3], Option<f64>> for ADXR {
    fn next(&mut self, input: [f64; 3]) -> Option<f64> {
        let adx = self.adx.next(input);
        match adx {
            None => (),
            Some(adx) => {
                self.adx_history.add(adx);

            },
        }
        return if self.adx_history.is_full() {
            let adxr = (adx.unwrap() + self.adx_history.at(0).unwrap()) / 2_f64;
            Some(adxr)
        } else {
            None
        }

    }

    fn reset(&mut self) {
        self.adx_history.clear();
        self.adx.reset();
    }
}

#[cfg(test)]
mod tests {

    use ta_common::traits::Indicator;
    use crate::adxr::ADXR;

    #[test]
    fn it_works() {
        let mut adxr = ADXR::new(5);
        assert_eq!(adxr.next([82.15, 81.29, 81.59]), None);
        assert_eq!(adxr.next([81.89, 80.64, 81.06]), None);
        assert_eq!(adxr.next([83.03, 81.31, 82.87]), None);
        assert_eq!(adxr.next([83.30, 82.65, 83.00]), None);
        assert_eq!(adxr.next([83.85, 83.07, 83.61]), None);
        assert_eq!(adxr.next([83.90, 83.11, 83.15]), None);
        assert_eq!(adxr.next([83.33, 82.49, 82.84]), None);
        assert_eq!(adxr.next([84.30, 82.30, 83.99]), None);
        assert_eq!(adxr.next([84.84, 84.15, 84.55]), None);
        assert_eq!(adxr.next([85.00, 84.11, 84.36]), None);
        assert_eq!(adxr.next([85.90, 84.03, 85.53]), None);
        assert_eq!(adxr.next([86.58, 85.39, 86.54]), None);
        assert_eq!(adxr.next([86.98, 85.76, 86.89]), Some(51.49047068971688));
        assert_eq!(adxr.next([88.00, 87.17, 87.77]), Some(55.63390965480972));
        assert_eq!(adxr.next([87.87, 87.01, 87.29]), Some(59.25861713224057));
    }
}