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//! `GET /_matrix/client/*/rooms/{roomId}/context/{eventId}`

pub mod v3 {
    //! `/v3/` ([spec])
    //!
    //! [spec]: https://spec.matrix.org/v1.2/client-server-api/#get_matrixclientv3roomsroomidcontexteventid

    use js_int::{uint, UInt};
    use ruma_common::{
        api::ruma_api,
        events::{AnyRoomEvent, AnyStateEvent},
        serde::Raw,
        EventId, RoomId,
    };

    use crate::filter::{IncomingRoomEventFilter, RoomEventFilter};

    ruma_api! {
        metadata: {
            description: "Get the events immediately preceding and following a given event.",
            method: GET,
            r0_path: "/_matrix/client/r0/rooms/:room_id/context/:event_id",
            stable_path: "/_matrix/client/v3/rooms/:room_id/context/:event_id",
            name: "get_context",
            rate_limited: false,
            authentication: AccessToken,
            added: 1.0,
        }

        request: {
            /// The room to get events from.
            #[ruma_api(path)]
            pub room_id: &'a RoomId,

            /// The event to get context around.
            #[ruma_api(path)]
            pub event_id: &'a EventId,

            /// The maximum number of events to return.
            ///
            /// Defaults to 10.
            #[ruma_api(query)]
            #[serde(default = "default_limit", skip_serializing_if = "is_default_limit")]
            pub limit: UInt,

            /// A RoomEventFilter to filter returned events with.
            #[ruma_api(query)]
            #[serde(
                with = "ruma_common::serde::json_string",
                default,
                skip_serializing_if = "RoomEventFilter::is_empty"
            )]
            pub filter: RoomEventFilter<'a>,
        }

        #[derive(Default)]
        response: {
            /// A token that can be used to paginate backwards with.
            #[serde(skip_serializing_if = "Option::is_none")]
            pub start: Option<String>,

            /// A token that can be used to paginate forwards with.
            #[serde(skip_serializing_if = "Option::is_none")]
            pub end: Option<String>,

            /// A list of room events that happened just before the requested event,
            /// in reverse-chronological order.
            #[serde(default, skip_serializing_if = "Vec::is_empty")]
            pub events_before: Vec<Raw<AnyRoomEvent>>,

            /// Details of the requested event.
            #[serde(skip_serializing_if = "Option::is_none")]
            pub event: Option<Raw<AnyRoomEvent>>,

            /// A list of room events that happened just after the requested event,
            /// in chronological order.
            #[serde(default, skip_serializing_if = "Vec::is_empty")]
            pub events_after: Vec<Raw<AnyRoomEvent>>,

            /// The state of the room at the last event returned.
            #[serde(default, skip_serializing_if = "Vec::is_empty")]
            pub state: Vec<Raw<AnyStateEvent>>,
        }

        error: crate::Error
    }

    impl<'a> Request<'a> {
        /// Creates a new `Request` with the given room id and event id.
        pub fn new(room_id: &'a RoomId, event_id: &'a EventId) -> Self {
            Self { room_id, event_id, limit: default_limit(), filter: RoomEventFilter::default() }
        }
    }

    impl Response {
        /// Creates an empty `Response`.
        pub fn new() -> Self {
            Default::default()
        }
    }

    fn default_limit() -> UInt {
        uint!(10)
    }

    #[allow(clippy::trivially_copy_pass_by_ref)]
    fn is_default_limit(val: &UInt) -> bool {
        *val == default_limit()
    }
}