package api

import (
	"context"

	"github.com/matrix-org/gomatrixserverlib"

	asAPI "github.com/matrix-org/dendrite/appservice/api"
	fsAPI "github.com/matrix-org/dendrite/federationapi/api"
	userapi "github.com/matrix-org/dendrite/userapi/api"
)

// RoomserverInputAPI is used to write events to the room server.
type RoomserverInternalAPI interface {
	InputRoomEventsAPI
	QueryLatestEventsAndStateAPI
	QueryEventsAPI

	SyncRoomserverAPI
	AppserviceRoomserverAPI
	ClientRoomserverAPI

	// needed to avoid chicken and egg scenario when setting up the
	// interdependencies between the roomserver and other input APIs
	SetFederationAPI(fsAPI fsAPI.FederationInternalAPI, keyRing *gomatrixserverlib.KeyRing)
	SetAppserviceAPI(asAPI asAPI.AppServiceQueryAPI)
	SetUserAPI(userAPI userapi.UserInternalAPI)

	PerformInvite(
		ctx context.Context,
		req *PerformInviteRequest,
		res *PerformInviteResponse,
	) error

	PerformJoin(
		ctx context.Context,
		req *PerformJoinRequest,
		res *PerformJoinResponse,
	)

	PerformLeave(
		ctx context.Context,
		req *PerformLeaveRequest,
		res *PerformLeaveResponse,
	) error

	PerformPeek(
		ctx context.Context,
		req *PerformPeekRequest,
		res *PerformPeekResponse,
	)

	PerformUnpeek(
		ctx context.Context,
		req *PerformUnpeekRequest,
		res *PerformUnpeekResponse,
	)

	PerformPublish(
		ctx context.Context,
		req *PerformPublishRequest,
		res *PerformPublishResponse,
	)

	PerformInboundPeek(
		ctx context.Context,
		req *PerformInboundPeekRequest,
		res *PerformInboundPeekResponse,
	) error

	QueryPublishedRooms(
		ctx context.Context,
		req *QueryPublishedRoomsRequest,
		res *QueryPublishedRoomsResponse,
	) error

	// Query if we think we're still in a room.
	QueryServerJoinedToRoom(
		ctx context.Context,
		req *QueryServerJoinedToRoomRequest,
		res *QueryServerJoinedToRoomResponse,
	) error

	// Query whether a server is allowed to see an event
	QueryServerAllowedToSeeEvent(
		ctx context.Context,
		req *QueryServerAllowedToSeeEventRequest,
		res *QueryServerAllowedToSeeEventResponse,
	) error

	// Query missing events for a room from roomserver
	QueryMissingEvents(
		ctx context.Context,
		req *QueryMissingEventsRequest,
		res *QueryMissingEventsResponse,
	) error

	// Query to get state and auth chain for a (potentially hypothetical) event.
	// Takes lists of PrevEventIDs and AuthEventsIDs and uses them to calculate
	// the state and auth chain to return.
	QueryStateAndAuthChain(
		ctx context.Context,
		req *QueryStateAndAuthChainRequest,
		res *QueryStateAndAuthChainResponse,
	) error

	// QueryAuthChain returns the entire auth chain for the event IDs given.
	// The response includes the events in the request.
	// Omits without error for any missing auth events. There will be no duplicates.
	QueryAuthChain(
		ctx context.Context,
		req *QueryAuthChainRequest,
		res *QueryAuthChainResponse,
	) error

	// QueryRoomsForUser retrieves a list of room IDs matching the given query.
	QueryRoomsForUser(ctx context.Context, req *QueryRoomsForUserRequest, res *QueryRoomsForUserResponse) error
	// QueryServerBannedFromRoom returns whether a server is banned from a room by server ACLs.
	QueryServerBannedFromRoom(ctx context.Context, req *QueryServerBannedFromRoomRequest, res *QueryServerBannedFromRoomResponse) error

	// PerformRoomUpgrade upgrades a room to a newer version
	PerformRoomUpgrade(ctx context.Context, req *PerformRoomUpgradeRequest, resp *PerformRoomUpgradeResponse)

	// Asks for the default room version as preferred by the server.
	QueryRoomVersionCapabilities(
		ctx context.Context,
		req *QueryRoomVersionCapabilitiesRequest,
		res *QueryRoomVersionCapabilitiesResponse,
	) error

	// Asks for the room version for a given room.
	QueryRoomVersionForRoom(
		ctx context.Context,
		req *QueryRoomVersionForRoomRequest,
		res *QueryRoomVersionForRoomResponse,
	) error

	// Set a room alias
	SetRoomAlias(
		ctx context.Context,
		req *SetRoomAliasRequest,
		res *SetRoomAliasResponse,
	) error

	// Get the room ID for an alias
	GetRoomIDForAlias(
		ctx context.Context,
		req *GetRoomIDForAliasRequest,
		res *GetRoomIDForAliasResponse,
	) error

	// Get the user ID of the creator of an alias
	GetCreatorIDForAlias(
		ctx context.Context,
		req *GetCreatorIDForAliasRequest,
		res *GetCreatorIDForAliasResponse,
	) error

	// Remove a room alias
	RemoveRoomAlias(
		ctx context.Context,
		req *RemoveRoomAliasRequest,
		res *RemoveRoomAliasResponse,
	) error
}

type InputRoomEventsAPI interface {
	InputRoomEvents(
		ctx context.Context,
		req *InputRoomEventsRequest,
		res *InputRoomEventsResponse,
	)
}

// Query the latest events and state for a room from the room server.
type QueryLatestEventsAndStateAPI interface {
	QueryLatestEventsAndState(ctx context.Context, req *QueryLatestEventsAndStateRequest, res *QueryLatestEventsAndStateResponse) error
}

// QueryBulkStateContent does a bulk query for state event content in the given rooms.
type QueryBulkStateContentAPI interface {
	QueryBulkStateContent(ctx context.Context, req *QueryBulkStateContentRequest, res *QueryBulkStateContentResponse) error
}

type QueryEventsAPI interface {
	// Query a list of events by event ID.
	QueryEventsByID(
		ctx context.Context,
		req *QueryEventsByIDRequest,
		res *QueryEventsByIDResponse,
	) error
	// QueryCurrentState retrieves the requested state events. If state events are not found, they will be missing from
	// the response.
	QueryCurrentState(ctx context.Context, req *QueryCurrentStateRequest, res *QueryCurrentStateResponse) error
}

// API functions required by the syncapi
type SyncRoomserverAPI interface {
	QueryLatestEventsAndStateAPI
	QueryBulkStateContentAPI
	// QuerySharedUsers returns a list of users who share at least 1 room in common with the given user.
	QuerySharedUsers(ctx context.Context, req *QuerySharedUsersRequest, res *QuerySharedUsersResponse) error
	// Query a list of events by event ID.
	QueryEventsByID(
		ctx context.Context,
		req *QueryEventsByIDRequest,
		res *QueryEventsByIDResponse,
	) error
	// Query the membership event for an user for a room.
	QueryMembershipForUser(
		ctx context.Context,
		req *QueryMembershipForUserRequest,
		res *QueryMembershipForUserResponse,
	) error

	// Query the state after a list of events in a room from the room server.
	QueryStateAfterEvents(
		ctx context.Context,
		req *QueryStateAfterEventsRequest,
		res *QueryStateAfterEventsResponse,
	) error

	// Query a given amount (or less) of events prior to a given set of events.
	PerformBackfill(
		ctx context.Context,
		req *PerformBackfillRequest,
		res *PerformBackfillResponse,
	) error
}

type AppserviceRoomserverAPI interface {
	// Query a list of events by event ID.
	QueryEventsByID(
		ctx context.Context,
		req *QueryEventsByIDRequest,
		res *QueryEventsByIDResponse,
	) error
	// Query a list of membership events for a room
	QueryMembershipsForRoom(
		ctx context.Context,
		req *QueryMembershipsForRoomRequest,
		res *QueryMembershipsForRoomResponse,
	) error
	// Get all known aliases for a room ID
	GetAliasesForRoomID(
		ctx context.Context,
		req *GetAliasesForRoomIDRequest,
		res *GetAliasesForRoomIDResponse,
	) error
}

type ClientRoomserverAPI interface {
	InputRoomEventsAPI
	QueryLatestEventsAndStateAPI
	QueryBulkStateContentAPI
	QueryEventsAPI
	QueryMembershipForUser(ctx context.Context, req *QueryMembershipForUserRequest, res *QueryMembershipForUserResponse) error
	QueryMembershipsForRoom(ctx context.Context, req *QueryMembershipsForRoomRequest, res *QueryMembershipsForRoomResponse) error
	QueryRoomsForUser(ctx context.Context, req *QueryRoomsForUserRequest, res *QueryRoomsForUserResponse) error
	QueryStateAfterEvents(ctx context.Context, req *QueryStateAfterEventsRequest, res *QueryStateAfterEventsResponse) error
	// QueryKnownUsers returns a list of users that we know about from our joined rooms.
	QueryKnownUsers(ctx context.Context, req *QueryKnownUsersRequest, res *QueryKnownUsersResponse) error
	QueryRoomVersionForRoom(ctx context.Context, req *QueryRoomVersionForRoomRequest, res *QueryRoomVersionForRoomResponse) error
	QueryPublishedRooms(ctx context.Context, req *QueryPublishedRoomsRequest, res *QueryPublishedRoomsResponse) error
	QueryRoomVersionCapabilities(ctx context.Context, req *QueryRoomVersionCapabilitiesRequest, res *QueryRoomVersionCapabilitiesResponse) error

	GetRoomIDForAlias(ctx context.Context, req *GetRoomIDForAliasRequest, res *GetRoomIDForAliasResponse) error
	GetAliasesForRoomID(ctx context.Context, req *GetAliasesForRoomIDRequest, res *GetAliasesForRoomIDResponse) error

	// PerformRoomUpgrade upgrades a room to a newer version
	PerformRoomUpgrade(ctx context.Context, req *PerformRoomUpgradeRequest, resp *PerformRoomUpgradeResponse)
	PerformAdminEvacuateRoom(
		ctx context.Context,
		req *PerformAdminEvacuateRoomRequest,
		res *PerformAdminEvacuateRoomResponse,
	)
	PerformPeek(ctx context.Context, req *PerformPeekRequest, res *PerformPeekResponse)
	PerformUnpeek(ctx context.Context, req *PerformUnpeekRequest, res *PerformUnpeekResponse)
	PerformInvite(ctx context.Context, req *PerformInviteRequest, res *PerformInviteResponse) error
	PerformJoin(ctx context.Context, req *PerformJoinRequest, res *PerformJoinResponse)
	PerformLeave(ctx context.Context, req *PerformLeaveRequest, res *PerformLeaveResponse) error
	PerformPublish(ctx context.Context, req *PerformPublishRequest, res *PerformPublishResponse)
	// PerformForget forgets a rooms history for a specific user
	PerformForget(ctx context.Context, req *PerformForgetRequest, resp *PerformForgetResponse) error
	SetRoomAlias(ctx context.Context, req *SetRoomAliasRequest, res *SetRoomAliasResponse) error
	RemoveRoomAlias(ctx context.Context, req *RemoveRoomAliasRequest, res *RemoveRoomAliasResponse) error
}