//! [GET /_matrix/federation/v1/backfill/{roomId}](https://matrix.org/docs/spec/server_server/r0.1.4#get-matrix-federation-v1-backfill-roomid)

use std::time::SystemTime;

use js_int::UInt;
use ruma_api::ruma_api;
use ruma_events::pdu::Pdu;
use ruma_identifiers::{EventId, RoomId, ServerNameBox};

ruma_api! {
    metadata: {
        description: "Request more history from another homeserver",
        name: "get_backfill",
        method: GET,
        path: "/_matrix/federation/v1/backfill/:room_id",
        rate_limited: false,
        requires_authentication: true,
    }

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

        /// The event IDs to backfill from.
        #[ruma_api(query)]
        pub v: &'a [EventId],

        /// The maximum number of PDUs to retrieve, including the given events.
        #[ruma_api(query)]
        pub limit: UInt,
    }

    response: {
        /// The `server_name` of the homeserver sending this transaction.
        pub origin: ServerNameBox,

        /// POSIX timestamp in milliseconds on originating homeserver when this transaction started.
        #[serde(with = "ruma_serde::time::ms_since_unix_epoch")]
        pub origin_server_ts: SystemTime,

        /// List of persistent updates to rooms.
        pub pdus: Vec<Pdu>,
    }
}

impl<'a> Request<'a> {
    /// Creates a new `Request` with:
    /// * the given room id.
    /// * the event IDs to backfill from.
    /// * the maximum number of PDUs to retrieve, including the given events.
    pub fn new(room_id: &'a RoomId, v: &'a [EventId], limit: UInt) -> Self {
        Self { room_id, v, limit }
    }
}

impl Response {
    /// Creates a new `Response` with:
    /// * the `server_name` of the homeserver.
    /// * the timestamp in milliseconds of when this transaction started.
    /// * the list of persistent updates to rooms.
    pub fn new(origin: ServerNameBox, origin_server_ts: SystemTime, pdus: Vec<Pdu>) -> Self {
        Self { origin, origin_server_ts, pdus }
    }
}