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use std::time::Duration;

use source::buffered::Buffered;

use Sample;
use Source;

/// Internal function that builds a `Repeat` object.
pub fn repeat<I>(input: I) -> Repeat<I> where I: Source, I::Item: Sample {
    let input = input.buffered();
    Repeat { inner: input.clone(), next: input }
}

/// A source that repeats the given source.
#[derive(Clone)]
pub struct Repeat<I> where I: Source, I::Item: Sample {
    inner: Buffered<I>,
    next: Buffered<I>,
}

impl<I> Iterator for Repeat<I> where I: Source, I::Item: Sample {
    type Item = <I as Iterator>::Item;

    #[inline]
    fn next(&mut self) -> Option<<I as Iterator>::Item> {
        if let Some(value) = self.inner.next() {
            return Some(value);
        }

        self.inner = self.next.clone();
        self.inner.next()
    }

    #[inline]
    fn size_hint(&self) -> (usize, Option<usize>) {
        // infinite
        (0, None)
    }
}

impl<I> Source for Repeat<I> where I: Iterator + Source, I::Item: Sample {
    #[inline]
    fn get_current_frame_len(&self) -> Option<usize> {
        match self.inner.get_current_frame_len() {
            Some(0) => self.next.get_current_frame_len(),
            a => a
        }
    }

    #[inline]
    fn get_channels(&self) -> u16 {
        match self.inner.get_current_frame_len() {
            Some(0) => self.next.get_channels(),
            _ => self.inner.get_channels()
        }
    }

    #[inline]
    fn get_samples_rate(&self) -> u32 {
        match self.inner.get_current_frame_len() {
            Some(0) => self.next.get_samples_rate(),
            _ => self.inner.get_samples_rate()
        }
    }

    #[inline]
    fn get_total_duration(&self) -> Option<Duration> {
        None
    }
}