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use std::sync::atomic::{AtomicU64, Ordering};

use matrix_sdk::{media::MediaEventContent, ruma::events::room::MediaSource};
use matrix_sdk_ui::timeline::{MsgLikeKind, TimelineItem as SdkTimelineItem, TimelineItemContent};
use ruma::{
    OwnedMxcUri,
    events::{
        room::{
            ImageInfo, ThumbnailInfo,
            message::{FileInfo, MessageType, VideoInfo},
        },
        sticker::{StickerEventContent, StickerMediaSource},
    },
};

use super::link_preview::sender_previews;
use crate::{MediaDescriptor, MediaId, MediaKind};

static NEXT_MEDIA_SCOPE: AtomicU64 = AtomicU64::new(1);

/// Per-timeline-session nonce namespacing recycled SDK unique IDs.
///
/// SDK 0.18 recycles [`SdkTimelineItem::unique_id`] across the local-to-remote
/// echo replacement, while transaction IDs disappear. Scoping the recycled ID
/// by a process-wide nonce keeps media IDs stable across replacement without
/// colliding across rooms, threads, or reopened sessions.
#[derive(Clone, Debug)]
pub(crate) struct MediaScope {
    nonce: u64,
}

impl MediaScope {
    pub(crate) fn new() -> Self {
        Self {
            nonce: NEXT_MEDIA_SCOPE.fetch_add(1, Ordering::Relaxed),
        }
    }

    pub(crate) fn owns(&self, id: &MediaId) -> bool {
        id.as_str()
            .split_once('#')
            .is_some_and(|(nonce, _)| nonce.parse() == Ok(self.nonce))
    }
}

#[derive(Clone)]
pub(crate) struct MediaRegistration {
    pub(crate) id: MediaId,
    pub(crate) kind: MediaKind,
    pub(crate) full: MediaSourceInfo,
    pub(crate) thumbnail: Option<MediaSourceInfo>,
}

#[derive(Clone)]
pub(crate) struct MediaSourceInfo {
    pub(crate) source: MediaSource,
    pub(crate) mimetype: Option<String>,
    pub(crate) declared_size: Option<u64>,
}

pub(super) fn media_registrations_for_item(
    item: &SdkTimelineItem,
    scope: &MediaScope,
) -> Vec<MediaRegistration> {
    let Some(event) = item.as_event() else {
        return Vec::new();
    };
    let identity = media_identity(item, scope);
    let TimelineItemContent::MsgLike(content) = event.content() else {
        return Vec::new();
    };
    match &content.kind {
        MsgLikeKind::Message(message) => media_registration(&identity, message.msgtype())
            .into_iter()
            .chain(
                sender_previews(Some(&identity), message.msgtype())
                    .into_iter()
                    .filter_map(|(_, registration)| registration),
            )
            .collect(),
        MsgLikeKind::Sticker(sticker) => media_sticker_registration(&identity, sticker.content())
            .into_iter()
            .collect(),
        _ => Vec::new(),
    }
}

pub(super) fn media_identity(item: &SdkTimelineItem, scope: &MediaScope) -> String {
    format!("{}#{}", scope.nonce, item.unique_id().0)
}

pub(super) fn media_from_message(identity: &str, message: &MessageType) -> Option<MediaDescriptor> {
    let descriptor =
        |kind, source: &MediaSource, filename: &str, caption: Option<&str>| MediaDescriptor {
            id: media_id(identity, "media"),
            kind,
            mxc: plain_mxc(source),
            filename: filename.to_owned(),
            caption: caption.map(str::to_owned),
            mimetype: None,
            size_bytes: None,
            width: None,
            height: None,
            duration_ms: None,
            blurhash: None,
            has_thumbnail: false,
        };
    let millis = |duration: std::time::Duration| u64::try_from(duration.as_millis()).ok();
    Some(match message {
        MessageType::Image(content) => {
            let info = content.info.as_deref();
            MediaDescriptor {
                mimetype: info.and_then(|info| info.mimetype.clone()),
                size_bytes: info.and_then(|info| info.size).map(u64::from),
                width: info.and_then(|info| info.width).map(u64::from),
                height: info.and_then(|info| info.height).map(u64::from),
                blurhash: info.and_then(|info| info.blurhash.clone()),
                has_thumbnail: info.is_some_and(|info| info.thumbnail_source.is_some()),
                ..descriptor(
                    MediaKind::Image,
                    &content.source,
                    content.filename(),
                    content.caption(),
                )
            }
        }
        MessageType::Video(content) => {
            let info = content.info.as_deref();
            MediaDescriptor {
                mimetype: info.and_then(|info| info.mimetype.clone()),
                size_bytes: info.and_then(|info| info.size).map(u64::from),
                width: info.and_then(|info| info.width).map(u64::from),
                height: info.and_then(|info| info.height).map(u64::from),
                duration_ms: info.and_then(|info| info.duration).and_then(millis),
                blurhash: info.and_then(|info| info.blurhash.clone()),
                has_thumbnail: info.is_some_and(|info| info.thumbnail_source.is_some()),
                ..descriptor(
                    MediaKind::Video,
                    &content.source,
                    content.filename(),
                    content.caption(),
                )
            }
        }
        MessageType::Audio(content) => {
            let info = content.info.as_deref();
            MediaDescriptor {
                mimetype: info.and_then(|info| info.mimetype.clone()),
                size_bytes: info.and_then(|info| info.size).map(u64::from),
                duration_ms: info.and_then(|info| info.duration).and_then(millis),
                ..descriptor(
                    MediaKind::Audio,
                    &content.source,
                    content.filename(),
                    content.caption(),
                )
            }
        }
        MessageType::File(content) => {
            let info = content.info.as_deref();
            MediaDescriptor {
                mimetype: info.and_then(|info| info.mimetype.clone()),
                size_bytes: info.and_then(|info| info.size).map(u64::from),
                has_thumbnail: info.is_some_and(|info| info.thumbnail_source.is_some()),
                ..descriptor(
                    MediaKind::File,
                    &content.source,
                    content.filename(),
                    content.caption(),
                )
            }
        }
        _ => return None,
    })
}

pub(super) fn media_descriptor_for_sticker(
    identity: &str,
    content: &StickerEventContent,
) -> MediaDescriptor {
    MediaDescriptor {
        id: media_id(identity, "sticker"),
        kind: MediaKind::Sticker,
        mxc: match &content.source {
            StickerMediaSource::Plain(uri) => Some(uri.clone()),
            _ => None,
        },
        filename: content.body.clone(),
        caption: None,
        mimetype: content.info.mimetype.clone(),
        size_bytes: content.info.size.map(u64::from),
        width: content.info.width.map(u64::from),
        height: content.info.height.map(u64::from),
        duration_ms: None,
        blurhash: content.info.blurhash.clone(),
        has_thumbnail: content.info.thumbnail_source.is_some(),
    }
}

fn plain_mxc(source: &MediaSource) -> Option<OwnedMxcUri> {
    match source {
        MediaSource::Plain(uri) => Some(uri.clone()),
        MediaSource::Encrypted(_) => None,
    }
}

pub(super) fn media_id(identity: &str, suffix: &str) -> MediaId {
    MediaId::new(format!("{identity}#{suffix}"))
}

fn media_sticker_registration(
    identity: &str,
    content: &StickerEventContent,
) -> Option<MediaRegistration> {
    Some(MediaRegistration {
        id: media_id(identity, "sticker"),
        kind: MediaKind::Sticker,
        full: MediaSourceInfo {
            source: content.source()?,
            mimetype: content.info.mimetype.clone(),
            declared_size: content.info.size.map(u64::from),
        },
        thumbnail: thumbnail_media_source(
            content.info.thumbnail_source.clone(),
            content.info.thumbnail_info.as_deref(),
        ),
    })
}

fn media_registration(identity: &str, message: &MessageType) -> Option<MediaRegistration> {
    match message {
        MessageType::Image(content) => media_registration_with_info(
            identity,
            MediaKind::Image,
            content.source(),
            content.info.as_deref(),
        ),
        MessageType::Video(content) => media_registration_with_info(
            identity,
            MediaKind::Video,
            content.source(),
            content.info.as_deref(),
        ),
        MessageType::File(content) => media_registration_with_info(
            identity,
            MediaKind::File,
            content.source(),
            content.info.as_deref(),
        ),
        MessageType::Audio(content) => media_registration_with_parts(
            identity,
            MediaKind::Audio,
            content.source(),
            content.info.as_ref().and_then(|info| info.mimetype.clone()),
            content
                .info
                .as_ref()
                .and_then(|info| info.size)
                .map(u64::from),
            None,
        ),
        _ => None,
    }
}

fn media_registration_with_info<T: MediaInfo>(
    identity: &str,
    kind: MediaKind,
    source: Option<MediaSource>,
    info: Option<&T>,
) -> Option<MediaRegistration> {
    media_registration_with_parts(
        identity,
        kind,
        source,
        info.and_then(MediaInfo::mimetype),
        info.and_then(MediaInfo::declared_size),
        info.and_then(MediaInfo::thumbnail),
    )
}

fn media_registration_with_parts(
    identity: &str,
    kind: MediaKind,
    source: Option<MediaSource>,
    mimetype: Option<String>,
    declared_size: Option<u64>,
    thumbnail: Option<MediaSourceInfo>,
) -> Option<MediaRegistration> {
    Some(MediaRegistration {
        id: media_id(identity, "media"),
        kind,
        full: MediaSourceInfo {
            source: source?,
            mimetype,
            declared_size,
        },
        thumbnail,
    })
}

trait MediaInfo {
    fn mimetype(&self) -> Option<String>;
    fn declared_size(&self) -> Option<u64>;
    fn thumbnail(&self) -> Option<MediaSourceInfo>;
}

macro_rules! impl_media_info {
    ($type:ty) => {
        impl MediaInfo for $type {
            fn mimetype(&self) -> Option<String> {
                self.mimetype.clone()
            }

            fn declared_size(&self) -> Option<u64> {
                self.size.map(u64::from)
            }

            fn thumbnail(&self) -> Option<MediaSourceInfo> {
                thumbnail_media_source(
                    self.thumbnail_source.clone(),
                    self.thumbnail_info.as_deref(),
                )
            }
        }
    };
}

impl_media_info!(ImageInfo);
impl_media_info!(VideoInfo);
impl_media_info!(FileInfo);

fn thumbnail_media_source(
    source: Option<MediaSource>,
    info: Option<&ThumbnailInfo>,
) -> Option<MediaSourceInfo> {
    source.map(|source| MediaSourceInfo {
        source,
        mimetype: info.and_then(|info| info.mimetype.clone()),
        declared_size: info.and_then(|info| info.size).map(u64::from),
    })
}

#[cfg(test)]
mod tests {
    use matrix_sdk::ruma::{
        events::room::{ImageInfo, message::ImageMessageEventContent},
        mxc_uri,
    };

    use super::*;

    #[test]
    fn image_messages_keep_media_metadata() {
        let mut info = ImageInfo::new();
        info.mimetype = Some("image/png".to_owned());
        info.size = Some(65_536_u32.into());
        info.width = Some(640_u32.into());
        info.height = Some(480_u32.into());
        let content = ImageMessageEventContent::plain(
            "screen.png".to_owned(),
            mxc_uri!("mxc://example.org/screen").to_owned(),
        )
        .info(Box::new(info));

        let media = media_from_message("$event:example.org", &MessageType::Image(content)).unwrap();
        assert_eq!(media.id.as_str(), "$event:example.org#media");
        assert_eq!(media.kind, MediaKind::Image);
        assert_eq!(media.filename, "screen.png");
        assert_eq!(media.caption, None);
        assert_eq!(media.mimetype.as_deref(), Some("image/png"));
        assert_eq!(media.size_bytes, Some(65_536));
        assert_eq!((media.width, media.height), (Some(640), Some(480)));
    }
}

1	use std::sync::atomic::{AtomicU64, Ordering};
2
3	use matrix_sdk::{media::MediaEventContent, ruma::events::room::MediaSource};
4	use matrix_sdk_ui::timeline::{MsgLikeKind, TimelineItem as SdkTimelineItem, TimelineItemContent};
5	use ruma::{
6	OwnedMxcUri,
7	events::{
8	room::{
9	ImageInfo, ThumbnailInfo,
10	message::{FileInfo, MessageType, VideoInfo},
11	},
12	sticker::{StickerEventContent, StickerMediaSource},
13	},
14	};
15
16	use super::link_preview::sender_previews;
17	use crate::{MediaDescriptor, MediaId, MediaKind};
18
19	static NEXT_MEDIA_SCOPE: AtomicU64 = AtomicU64::new(1);
20
21	/// Per-timeline-session nonce namespacing recycled SDK unique IDs.
22	///
23	/// SDK 0.18 recycles [`SdkTimelineItem::unique_id`] across the local-to-remote
24	/// echo replacement, while transaction IDs disappear. Scoping the recycled ID
25	/// by a process-wide nonce keeps media IDs stable across replacement without
26	/// colliding across rooms, threads, or reopened sessions.
27	#[derive(Clone, Debug)]
28	pub(crate) struct MediaScope {
29	nonce: u64,
30	}
31
32	impl MediaScope {
33	pub(crate) fn new() -> Self {
34	Self {
35	nonce: NEXT_MEDIA_SCOPE.fetch_add(1, Ordering::Relaxed),
36	}
37	}
38
39	pub(crate) fn owns(&self, id: &MediaId) -> bool {
40	id.as_str()
41	.split_once('#')
42	.is_some_and(\|(nonce, _)\| nonce.parse() == Ok(self.nonce))
43	}
44	}
45
46	#[derive(Clone)]
47	pub(crate) struct MediaRegistration {
48	pub(crate) id: MediaId,
49	pub(crate) kind: MediaKind,
50	pub(crate) full: MediaSourceInfo,
51	pub(crate) thumbnail: Option<MediaSourceInfo>,
52	}
53
54	#[derive(Clone)]
55	pub(crate) struct MediaSourceInfo {
56	pub(crate) source: MediaSource,
57	pub(crate) mimetype: Option<String>,
58	pub(crate) declared_size: Option<u64>,
59	}
60
61	pub(super) fn media_registrations_for_item(
62	item: &SdkTimelineItem,
63	scope: &MediaScope,
64	) -> Vec<MediaRegistration> {
65	let Some(event) = item.as_event() else {
66	return Vec::new();
67	};
68	let identity = media_identity(item, scope);
69	let TimelineItemContent::MsgLike(content) = event.content() else {
70	return Vec::new();
71	};
72	match &content.kind {
73	MsgLikeKind::Message(message) => media_registration(&identity, message.msgtype())
74	.into_iter()
75	.chain(
76	sender_previews(Some(&identity), message.msgtype())
77	.into_iter()
78	.filter_map(\|(_, registration)\| registration),
79	)
80	.collect(),
81	MsgLikeKind::Sticker(sticker) => media_sticker_registration(&identity, sticker.content())
82	.into_iter()
83	.collect(),
84	_ => Vec::new(),
85	}
86	}
87
88	pub(super) fn media_identity(item: &SdkTimelineItem, scope: &MediaScope) -> String {
89	format!("{}#{}", scope.nonce, item.unique_id().0)
90	}
91
92	pub(super) fn media_from_message(identity: &str, message: &MessageType) -> Option<MediaDescriptor> {
93	let descriptor =
94	\|kind, source: &MediaSource, filename: &str, caption: Option<&str>\| MediaDescriptor {
95	id: media_id(identity, "media"),
96	kind,
97	mxc: plain_mxc(source),
98	filename: filename.to_owned(),
99	caption: caption.map(str::to_owned),
100	mimetype: None,
101	size_bytes: None,
102	width: None,
103	height: None,
104	duration_ms: None,
105	blurhash: None,
106	has_thumbnail: false,
107	};
108	let millis = \|duration: std::time::Duration\| u64::try_from(duration.as_millis()).ok();
109	Some(match message {
110	MessageType::Image(content) => {
111	let info = content.info.as_deref();
112	MediaDescriptor {
113	mimetype: info.and_then(\|info\| info.mimetype.clone()),
114	size_bytes: info.and_then(\|info\| info.size).map(u64::from),
115	width: info.and_then(\|info\| info.width).map(u64::from),
116	height: info.and_then(\|info\| info.height).map(u64::from),
117	blurhash: info.and_then(\|info\| info.blurhash.clone()),
118	has_thumbnail: info.is_some_and(\|info\| info.thumbnail_source.is_some()),
119	..descriptor(
120	MediaKind::Image,
121	&content.source,
122	content.filename(),
123	content.caption(),
124	)
125	}
126	}
127	MessageType::Video(content) => {
128	let info = content.info.as_deref();
129	MediaDescriptor {
130	mimetype: info.and_then(\|info\| info.mimetype.clone()),
131	size_bytes: info.and_then(\|info\| info.size).map(u64::from),
132	width: info.and_then(\|info\| info.width).map(u64::from),
133	height: info.and_then(\|info\| info.height).map(u64::from),
134	duration_ms: info.and_then(\|info\| info.duration).and_then(millis),
135	blurhash: info.and_then(\|info\| info.blurhash.clone()),
136	has_thumbnail: info.is_some_and(\|info\| info.thumbnail_source.is_some()),
137	..descriptor(
138	MediaKind::Video,
139	&content.source,
140	content.filename(),
141	content.caption(),
142	)
143	}
144	}
145	MessageType::Audio(content) => {
146	let info = content.info.as_deref();
147	MediaDescriptor {
148	mimetype: info.and_then(\|info\| info.mimetype.clone()),
149	size_bytes: info.and_then(\|info\| info.size).map(u64::from),
150	duration_ms: info.and_then(\|info\| info.duration).and_then(millis),
151	..descriptor(
152	MediaKind::Audio,
153	&content.source,
154	content.filename(),
155	content.caption(),
156	)
157	}
158	}
159	MessageType::File(content) => {
160	let info = content.info.as_deref();
161	MediaDescriptor {
162	mimetype: info.and_then(\|info\| info.mimetype.clone()),
163	size_bytes: info.and_then(\|info\| info.size).map(u64::from),
164	has_thumbnail: info.is_some_and(\|info\| info.thumbnail_source.is_some()),
165	..descriptor(
166	MediaKind::File,
167	&content.source,
168	content.filename(),
169	content.caption(),
170	)
171	}
172	}
173	_ => return None,
174	})
175	}
176
177	pub(super) fn media_descriptor_for_sticker(
178	identity: &str,
179	content: &StickerEventContent,
180	) -> MediaDescriptor {
181	MediaDescriptor {
182	id: media_id(identity, "sticker"),
183	kind: MediaKind::Sticker,
184	mxc: match &content.source {
185	StickerMediaSource::Plain(uri) => Some(uri.clone()),
186	_ => None,
187	},
188	filename: content.body.clone(),
189	caption: None,
190	mimetype: content.info.mimetype.clone(),
191	size_bytes: content.info.size.map(u64::from),
192	width: content.info.width.map(u64::from),
193	height: content.info.height.map(u64::from),
194	duration_ms: None,
195	blurhash: content.info.blurhash.clone(),
196	has_thumbnail: content.info.thumbnail_source.is_some(),
197	}
198	}
199
200	fn plain_mxc(source: &MediaSource) -> Option<OwnedMxcUri> {
201	match source {
202	MediaSource::Plain(uri) => Some(uri.clone()),
203	MediaSource::Encrypted(_) => None,
204	}
205	}
206
207	pub(super) fn media_id(identity: &str, suffix: &str) -> MediaId {
208	MediaId::new(format!("{identity}#{suffix}"))
209	}
210
211	fn media_sticker_registration(
212	identity: &str,
213	content: &StickerEventContent,
214	) -> Option<MediaRegistration> {
215	Some(MediaRegistration {
216	id: media_id(identity, "sticker"),
217	kind: MediaKind::Sticker,
218	full: MediaSourceInfo {
219	source: content.source()?,
220	mimetype: content.info.mimetype.clone(),
221	declared_size: content.info.size.map(u64::from),
222	},
223	thumbnail: thumbnail_media_source(
224	content.info.thumbnail_source.clone(),
225	content.info.thumbnail_info.as_deref(),
226	),
227	})
228	}
229
230	fn media_registration(identity: &str, message: &MessageType) -> Option<MediaRegistration> {
231	match message {
232	MessageType::Image(content) => media_registration_with_info(
233	identity,
234	MediaKind::Image,
235	content.source(),
236	content.info.as_deref(),
237	),
238	MessageType::Video(content) => media_registration_with_info(
239	identity,
240	MediaKind::Video,
241	content.source(),
242	content.info.as_deref(),
243	),
244	MessageType::File(content) => media_registration_with_info(
245	identity,
246	MediaKind::File,
247	content.source(),
248	content.info.as_deref(),
249	),
250	MessageType::Audio(content) => media_registration_with_parts(
251	identity,
252	MediaKind::Audio,
253	content.source(),
254	content.info.as_ref().and_then(\|info\| info.mimetype.clone()),
255	content
256	.info
257	.as_ref()
258	.and_then(\|info\| info.size)
259	.map(u64::from),
260	None,
261	),
262	_ => None,
263	}
264	}
265
266	fn media_registration_with_info<T: MediaInfo>(
267	identity: &str,
268	kind: MediaKind,
269	source: Option<MediaSource>,
270	info: Option<&T>,
271	) -> Option<MediaRegistration> {
272	media_registration_with_parts(
273	identity,
274	kind,
275	source,
276	info.and_then(MediaInfo::mimetype),
277	info.and_then(MediaInfo::declared_size),
278	info.and_then(MediaInfo::thumbnail),
279	)
280	}
281
282	fn media_registration_with_parts(
283	identity: &str,
284	kind: MediaKind,
285	source: Option<MediaSource>,
286	mimetype: Option<String>,
287	declared_size: Option<u64>,
288	thumbnail: Option<MediaSourceInfo>,
289	) -> Option<MediaRegistration> {
290	Some(MediaRegistration {
291	id: media_id(identity, "media"),
292	kind,
293	full: MediaSourceInfo {
294	source: source?,
295	mimetype,
296	declared_size,
297	},
298	thumbnail,
299	})
300	}
301
302	trait MediaInfo {
303	fn mimetype(&self) -> Option<String>;
304	fn declared_size(&self) -> Option<u64>;
305	fn thumbnail(&self) -> Option<MediaSourceInfo>;
306	}
307
308	macro_rules! impl_media_info {
309	($type:ty) => {
310	impl MediaInfo for $type {
311	fn mimetype(&self) -> Option<String> {
312	self.mimetype.clone()
313	}
314
315	fn declared_size(&self) -> Option<u64> {
316	self.size.map(u64::from)
317	}
318
319	fn thumbnail(&self) -> Option<MediaSourceInfo> {
320	thumbnail_media_source(
321	self.thumbnail_source.clone(),
322	self.thumbnail_info.as_deref(),
323	)
324	}
325	}
326	};
327	}
328
329	impl_media_info!(ImageInfo);
330	impl_media_info!(VideoInfo);
331	impl_media_info!(FileInfo);
332
333	fn thumbnail_media_source(
334	source: Option<MediaSource>,
335	info: Option<&ThumbnailInfo>,
336	) -> Option<MediaSourceInfo> {
337	source.map(\|source\| MediaSourceInfo {
338	source,
339	mimetype: info.and_then(\|info\| info.mimetype.clone()),
340	declared_size: info.and_then(\|info\| info.size).map(u64::from),
341	})
342	}
343
344	#[cfg(test)]
345	mod tests {
346	use matrix_sdk::ruma::{
347	events::room::{ImageInfo, message::ImageMessageEventContent},
348	mxc_uri,
349	};
350
351	use super::*;
352
353	#[test]
354	fn image_messages_keep_media_metadata() {
355	let mut info = ImageInfo::new();
356	info.mimetype = Some("image/png".to_owned());
357	info.size = Some(65_536_u32.into());
358	info.width = Some(640_u32.into());
359	info.height = Some(480_u32.into());
360	let content = ImageMessageEventContent::plain(
361	"screen.png".to_owned(),
362	mxc_uri!("mxc://example.org/screen").to_owned(),
363	)
364	.info(Box::new(info));
365
366	let media = media_from_message("$event:example.org", &MessageType::Image(content)).unwrap();
367	assert_eq!(media.id.as_str(), "$event:example.org#media");
368	assert_eq!(media.kind, MediaKind::Image);
369	assert_eq!(media.filename, "screen.png");
370	assert_eq!(media.caption, None);
371	assert_eq!(media.mimetype.as_deref(), Some("image/png"));
372	assert_eq!(media.size_bytes, Some(65_536));
373	assert_eq!((media.width, media.height), (Some(640), Some(480)));
374	}
375	}