1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
// Take a look at the license at the top of the repository in the LICENSE file.

use std::{boxed::Box as Box_, fmt, mem::transmute};

use glib::{
    object::ObjectType as ObjectType_,
    signal::{connect_raw, SignalHandlerId},
    translate::*,
};

use crate::{Stream, StreamCollection};

#[derive(Debug)]
pub struct Iter<'a> {
    collection: &'a StreamCollection,
    idx: usize,
    size: usize,
}

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

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.stream(self.idx as u32).unwrap();
        self.idx += 1;

        Some(item)
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        let remaining = self.size - self.idx;

        (remaining, Some(remaining))
    }

    fn count(self) -> usize {
        self.size - self.idx
    }

    fn nth(&mut self, n: usize) -> Option<Self::Item> {
        let (end, overflow) = self.idx.overflowing_add(n);
        if end >= self.size || overflow {
            self.idx = self.size;
            None
        } else {
            self.idx = end + 1;
            Some(self.collection.stream(end as u32).unwrap())
        }
    }

    fn last(self) -> Option<Self::Item> {
        if self.idx == self.size {
            None
        } else {
            Some(self.collection.stream(self.size as u32 - 1).unwrap())
        }
    }
}

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

        self.size -= 1;
        Some(self.collection.stream(self.size as u32).unwrap())
    }

    fn nth_back(&mut self, n: usize) -> Option<Self::Item> {
        let (end, overflow) = self.size.overflowing_sub(n);
        if end <= self.idx || overflow {
            self.idx = self.size;
            None
        } else {
            self.size = end - 1;
            Some(self.collection.stream(self.size as u32).unwrap())
        }
    }
}

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

impl<'a> std::iter::FusedIterator for Iter<'a> {}

#[derive(Debug, Clone)]
#[must_use = "The builder must be built to be used"]
pub struct StreamCollectionBuilder(StreamCollection);

impl StreamCollectionBuilder {
    #[doc(alias = "gst_stream_collection_add_stream")]
    pub fn stream(self, stream: Stream) -> Self {
        unsafe {
            ffi::gst_stream_collection_add_stream(
                (self.0).to_glib_none().0,
                stream.into_glib_ptr(),
            );
        }

        self
    }

    pub fn streams(self, streams: impl IntoIterator<Item = Stream>) -> Self {
        for stream in streams.into_iter() {
            unsafe {
                ffi::gst_stream_collection_add_stream(
                    (self.0).to_glib_none().0,
                    stream.into_glib_ptr(),
                );
            }
        }

        self
    }

    #[must_use = "Building the stream collection without using it has no effect"]
    pub fn build(self) -> StreamCollection {
        self.0
    }
}

impl StreamCollection {
    #[doc(alias = "gst_stream_collection_new")]
    pub fn builder(upstream_id: Option<&str>) -> StreamCollectionBuilder {
        assert_initialized_main_thread!();
        let upstream_id = upstream_id.to_glib_none();
        let collection = unsafe { from_glib_full(ffi::gst_stream_collection_new(upstream_id.0)) };

        StreamCollectionBuilder(collection)
    }

    #[doc(alias = "stream-notify")]
    pub fn connect_stream_notify<
        F: Fn(&Self, &Stream, &glib::ParamSpec) + Send + Sync + 'static,
    >(
        &self,
        detail: Option<&str>,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn stream_notify_trampoline<
            F: Fn(&StreamCollection, &Stream, &glib::ParamSpec) + Send + Sync + 'static,
        >(
            this: *mut ffi::GstStreamCollection,
            object: *mut ffi::GstStream,
            p0: *mut glib::gobject_ffi::GParamSpec,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(
                &from_glib_borrow(this),
                &from_glib_borrow(object),
                &from_glib_borrow(p0),
            )
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            let detailed_signal_name = detail.map(|name| format!("stream-notify::{name}\0"));
            let signal_name: &[u8] = detailed_signal_name
                .as_ref()
                .map_or(&b"stream-notify\0"[..], |n| n.as_bytes());
            connect_raw(
                self.as_ptr() as *mut _,
                signal_name.as_ptr() as *const _,
                Some(transmute::<*const (), unsafe extern "C" fn()>(
                    stream_notify_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

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

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

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

    pub fn debug(&self) -> Debug {
        Debug(self)
    }
}

impl<'a> IntoIterator for &'a StreamCollection {
    type IntoIter = Iter<'a>;
    type Item = Stream;

    fn into_iter(self) -> Self::IntoIter {
        self.iter()
    }
}

pub struct Debug<'a>(&'a StreamCollection);

impl<'a> fmt::Debug for Debug<'a> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        struct Streams<'a>(&'a StreamCollection);

        impl<'a> fmt::Debug for Streams<'a> {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                let mut f = f.debug_list();

                for stream in self.0.iter() {
                    f.entry(&stream.debug());
                }

                f.finish()
            }
        }

        let streams = Streams(self.0);

        f.debug_struct("StreamCollection")
            .field("streams", &streams)
            .finish()
    }
}