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//! Types for the *m.room.canonical_alias* event.

use ruma_events_macros::ruma_event;
use ruma_identifiers::RoomAliasId;

ruma_event! {
    /// Informs the room as to which alias is the canonical one.
    CanonicalAliasEvent {
        kind: StateEvent,
        event_type: "m.room.canonical_alias",
        content: {
            /// The canonical alias.
            ///
            /// Rooms with `alias: None` should be treated the same as a room
            /// with no canonical alias.
            #[serde(
                default, deserialize_with = "ruma_serde::empty_string_as_none",
                skip_serializing_if = "Option::is_none"
            )]
            pub alias: Option<RoomAliasId>,
        },
    }
}

#[cfg(test)]
mod tests {
    use std::{
        convert::TryFrom,
        time::{Duration, UNIX_EPOCH},
    };

    use ruma_identifiers::{EventId, RoomAliasId, UserId};
    use serde_json::{from_value as from_json_value, json, to_value as to_json_value};

    use super::{CanonicalAliasEvent, CanonicalAliasEventContent};
    use crate::{EventJson, UnsignedData};

    #[test]
    fn serialization_with_optional_fields_as_none() {
        let canonical_alias_event = CanonicalAliasEvent {
            content: CanonicalAliasEventContent {
                alias: Some(RoomAliasId::try_from("#somewhere:localhost").unwrap()),
            },
            event_id: EventId::try_from("$h29iv0s8:example.com").unwrap(),
            origin_server_ts: UNIX_EPOCH + Duration::from_millis(1),
            prev_content: None,
            room_id: None,
            sender: UserId::try_from("@carl:example.com").unwrap(),
            state_key: "".to_string(),
            unsigned: UnsignedData::default(),
        };

        let actual = to_json_value(&canonical_alias_event).unwrap();
        let expected = json!({
            "content": {
                "alias": "#somewhere:localhost"
            },
            "event_id": "$h29iv0s8:example.com",
            "origin_server_ts": 1,
            "sender": "@carl:example.com",
            "state_key": "",
            "type": "m.room.canonical_alias"
        });

        assert_eq!(actual, expected);
    }

    #[test]
    fn absent_field_as_none() {
        let json_data = json!({
            "content": {},
            "event_id": "$h29iv0s8:example.com",
            "origin_server_ts": 1,
            "sender": "@carl:example.com",
            "state_key": "",
            "type": "m.room.canonical_alias"
        });

        assert_eq!(
            from_json_value::<EventJson<CanonicalAliasEvent>>(json_data)
                .unwrap()
                .deserialize()
                .unwrap()
                .content
                .alias,
            None
        );
    }

    #[test]
    fn null_field_as_none() {
        let json_data = json!({
            "content": {
                "alias": null
            },
            "event_id": "$h29iv0s8:example.com",
            "origin_server_ts": 1,
            "sender": "@carl:example.com",
            "state_key": "",
            "type": "m.room.canonical_alias"
        });
        assert_eq!(
            from_json_value::<EventJson<CanonicalAliasEvent>>(json_data)
                .unwrap()
                .deserialize()
                .unwrap()
                .content
                .alias,
            None
        );
    }

    #[test]
    fn empty_field_as_none() {
        let json_data = json!({
            "content": {
                "alias": ""
            },
            "event_id": "$h29iv0s8:example.com",
            "origin_server_ts": 1,
            "sender": "@carl:example.com",
            "state_key": "",
            "type": "m.room.canonical_alias"
        });
        assert_eq!(
            from_json_value::<EventJson<CanonicalAliasEvent>>(json_data)
                .unwrap()
                .deserialize()
                .unwrap()
                .content
                .alias,
            None
        );
    }

    #[test]
    fn nonempty_field_as_some() {
        let alias = Some(RoomAliasId::try_from("#somewhere:localhost").unwrap());
        let json_data = json!({
            "content": {
                "alias": "#somewhere:localhost"
            },
            "event_id": "$h29iv0s8:example.com",
            "origin_server_ts": 1,
            "sender": "@carl:example.com",
            "state_key": "",
            "type": "m.room.canonical_alias"
        });
        assert_eq!(
            from_json_value::<EventJson<CanonicalAliasEvent>>(json_data)
                .unwrap()
                .deserialize()
                .unwrap()
                .content
                .alias,
            alias
        );
    }
}