/*
 * Copyright (c) 2020-2021 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

use std::ops::Mul;

use crate::{IQSample, Scalar};
use super::Signal;
use super::Mixer;

pub struct Gain<T: Signal> {
    lhs: T,
    rhs: Scalar,
}

impl<T: Signal> Gain<T> {
    pub fn new(lhs: T, rhs: Scalar) -> Gain<T> {
        Gain {
            lhs: lhs,
            rhs: rhs,
        }
    }
}

impl<T: Signal> Signal for Gain<T> {
    fn sample_rate(&self) -> u64 {
        self.lhs.sample_rate()
    }

    fn sample_size(&self) -> usize {
        std::mem::size_of::<IQSample>()
    }

    fn sample_shift(&self) -> u64 {
        self.lhs.sample_shift()
    }

    fn freq(&self) -> u64 {
        self.lhs.freq()
    }
}

impl<T: Signal> Iterator for Gain<T> {
    type Item = IQSample;

    fn next(&mut self) -> Option<Self::Item> {
        self.lhs.next().map(|s| s * self.rhs)
    }
}

include!("math.rs");
signal_math!(Gain<Signal>);