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//! [GET /_matrix/client/r0/rooms/{roomId}/context/{eventId}](https://matrix.org/docs/spec/client_server/r0.6.0#get-matrix-client-r0-rooms-roomid-context-eventid)

use js_int::UInt;
use ruma_api::ruma_api;
use ruma_events::{collections::only, EventJson};
use ruma_identifiers::{EventId, RoomId};

use crate::r0::filter::RoomEventFilter;

ruma_api! {
    metadata {
        description: "Get the events immediately preceding and following a given event.",
        method: GET,
        path: "/_matrix/client/r0/rooms/:room_id/context/:event_id",
        name: "get_context",
        rate_limited: false,
        requires_authentication: true,
    }

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

        /// The event to get context around.
        #[ruma_api(path)]
        pub event_id: 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(skip_serializing_if = "Option::is_none")]
        pub filter: Option<RoomEventFilter>,
    }

    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<EventJson<only::RoomEvent>>,

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

        /// 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<EventJson<only::RoomEvent>>,

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

    error: crate::Error
}

fn default_limit() -> UInt {
    UInt::from(10u32)
}

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