"use strict";

const required = require("@validatem/required");
const isString = require("@validatem/is-string");
const isInteger = require("@validatem/is-integer");
const isPlainObject = require("@validatem/is-plain-object");

const isEvent = require("../is-event");
const isMatrixID = require("../is-matrix-id");
const isEventID = require("../is-event-id");
const isRoomID = require("../is-room-id");
const optionalObject = require("../optional-object");
const isPaginatedChunkOf = require("../is-paginated-chunk-of");

module.exports = {
	... isEvent,
	event_id: [ required, isString ],
	sender: [ required, isMatrixID ],
	origin_server_ts: [ required, isInteger ],
	// In spec, but missing from Room Event format: https://github.com/matrix-org/matrix-doc/issues/2684
	redacts: isEventID, // FIXME: Make required when redaction-type event
	// Spec omission: https://github.com/matrix-org/matrix-doc/issues/2685
	age_ts: isInteger,
	room_id: [ isRoomID ], // FIXME: Not present on /sync, but will need to be required-checked for event validation elsewhere
	// Synapse bug: https://github.com/matrix-org/synapse/issues/7925
	age: isInteger,
	// Synapse bug: https://github.com/matrix-org/synapse/issues/7924
	user_id: isMatrixID,
	// Synapse bug: https://github.com/matrix-org/synapse/issues/7925#issuecomment-662089208
	replaces_state: isEventID,
	// Synapse bug: https://github.com/matrix-org/synapse/issues/7925#issuecomment-663247760
	redacted_because: isPlainObject,
	// Obsolete field originating from a now-defunct Synapse fork running on ponies.im
	origin_server_ipts: [ isInteger ],
	unsigned: optionalObject({
		age: isInteger,
		transaction_id: isString,
		redacted_because: isPlainObject, // FIXME: Cannot do recursion with isRoomEvent (/isStateEvent) -- fixable via `dynamic` wrapper, so that the rules are only generated *after* the validator has finished being declared?
		// Spec omission: https://github.com/matrix-org/matrix-doc/issues/2690
		redacted_by: isEventID,
		// Spec omission: https://github.com/matrix-org/matrix-doc/issues/1167
		replaces_state: isEventID,
		// Spec omission and/or Synapse bug: https://github.com/matrix-org/matrix-doc/issues/877
		prev_content: isPlainObject,
		// Spec omission: https://github.com/matrix-org/matrix-doc/issues/684
		prev_sender: isMatrixID,
		// MSC 1849, not merged yet: https://github.com/matrix-org/matrix-doc/blob/matthew/msc1849/proposals/1849-aggregations.md
		"m.relations": {
			"m.annotation": isPaginatedChunkOf({
				type: [ required, isString ],
				key: [ required, isString ],
				// Should be required according to MSC, but currently missing in Synapse: https://github.com/matrix-org/synapse/issues/7941#issuecomment-663238820
				origin_server_ts: [ /* required, */ isInteger ],
				count: [ required, isInteger ]
			}),
			"m.reference": isPaginatedChunkOf({
				// Should be required according to MSC, but currently missing in Synapse: https://github.com/matrix-org/synapse/issues/7941
				type: [ /* required, */ isString ],
				event_id: [ required, isEventID ]
			}),
			"m.replace": {
				event_id: [ required, isEventID ],
				origin_server_ts: [ required, isInteger ],
				sender: [ required, isMatrixID ]
			}
		}
	})
};