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// Copyright (C) 2017 Sebastian Dröge <sebastian@centricular.com>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use ffi;
use glib::translate::*;
use Stream;
use StreamCollection;

pub struct Iter<'a> {
    collection: &'a StreamCollection,
    idx: u32,
    size: u32,
}

impl<'a> Iter<'a> {
    fn new(collection: &'a StreamCollection) -> Iter<'a> {
        skip_assert_initialized!();
        Iter {
            collection,
            idx: 0,
            size: collection.len() as u32,
        }
    }
}

impl<'a> Iterator for Iter<'a> {
    type Item = Stream;

    fn next(&mut self) -> Option<Self::Item> {
        if self.idx >= self.size {
            return None;
        }

        let item = self.collection.get_stream(self.idx);
        self.idx += 1;

        item
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        if self.idx == self.size {
            return (0, Some(0));
        }

        let remaining = (self.size - self.idx) as usize;

        (remaining, Some(remaining))
    }
}

impl<'a> DoubleEndedIterator for Iter<'a> {
    fn next_back(&mut self) -> Option<Self::Item> {
        if self.idx == self.size {
            return None;
        }

        self.size -= 1;
        self.collection.get_stream(self.size)
    }
}

impl<'a> ExactSizeIterator for Iter<'a> {}

impl StreamCollection {
    /// Create a new `StreamCollection`.
    ///
    /// Feature: `v1_10`
    ///
    /// ## `upstream_id`
    /// The stream id of the parent stream
    ///
    /// # Returns
    ///
    /// The new `StreamCollection`.
    pub fn new<'a, P: Into<Option<&'a str>>>(upstream_id: P) -> StreamCollection {
        assert_initialized_main_thread!();
        let upstream_id = upstream_id.into();
        let upstream_id = upstream_id.to_glib_none();
        let (major, minor, _, _) = ::version();
        if (major, minor) > (1, 12) {
            unsafe { from_glib_full(ffi::gst_stream_collection_new(upstream_id.0)) }
        } else {
            // Work-around for 1.14 switching from transfer-floating to transfer-full
            unsafe { from_glib_none(ffi::gst_stream_collection_new(upstream_id.0)) }
        }
    }

    pub fn iter(&self) -> Iter {
        Iter::new(self)
    }

    pub fn len(&self) -> usize {
        self.get_size() as usize
    }

    pub fn is_empty(&self) -> bool {
        self.len() == 0
    }
}