import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import assert from "node:assert/strict";
import { Controller, HostRecord, InstanceRecord, UserRecord } from "@clusterio/controller";
import events, { EventEmitter } from "node:events";
import http from "node:http";
import express from "express";
import { fileURLToPath } from "node:url";

import {
	ControllerConfig, Address, RequestError,
	InstanceConfig, SystemInfo, Role, ModPack, AccountUpdateEvent,
	addPluginConfigFields,
} from "@clusterio/lib";

import "../setup_logging.js";

class MockEvent {}

class MockInstanceConfig extends EventEmitter {
	constructor(data = new Map()) {
		super();
		this._data = data;
	}

	get(field) {
		return this._data.get(field);
	}

	set(field, value) {
		const prev = this.get(field);
		this._data.set(field, value);
		this.emit("fieldChanged", field, value, prev);
	}
}

describe("controller/src/Controller", function() {
	describe("class Controller", async function() {
		/** @type {Controller} */
		let controller, mockInstanceConfig;
		const controllerVersion = (
			await import("@clusterio/controller/package.json", { with: { type: "json" }})
		).default.version;
		before(async function() {
			const controllerConfig = new ControllerConfig("controller", { "controller.version": controllerVersion });
			controller = new Controller({}, [], controllerConfig);
			mockInstanceConfig = new MockInstanceConfig(new Map([
				["instance.id", 100], ["instance.name", "test"], ["factorio.settings", []],
			]));
			await controller.instances.createInstance(mockInstanceConfig);
		});
		function check(list, ip, present = true) {
			if (present === false) {
				assert(!list.check(ip), `${ip} unexpectedly in list`);
			} else {
				assert(list.check(ip), `${ip} missing from list`);
			}
		}
		describe(".loadJsonObject()", function() {
			let dir;
			before(async function() {
				dir = await fs.mkdtemp(path.join(os.tmpdir(), "clusterio-load-json-"));
				await fs.writeFile(path.join(dir, "valid.json"), JSON.stringify({ "main.js": "main.123.js" }));
				await fs.writeFile(path.join(dir, "invalid.json"), "{ not json");
			});
			after(async function() {
				await fs.rm(dir, { recursive: true, force: true });
			});
			it("should parse an existing file", async function() {
				assert.deepEqual(
					await Controller.loadJsonObject(path.join(dir, "valid.json")),
					{ "main.js": "main.123.js" },
				);
			});
			it("should return an empty object for a missing file by default", async function() {
				assert.deepEqual(await Controller.loadJsonObject(path.join(dir, "missing.json")), {});
			});
			it("should throw for a missing file when throwOnMissing is set", async function() {
				await assert.rejects(
					Controller.loadJsonObject(path.join(dir, "missing.json"), true),
					{ code: "ENOENT" },
				);
			});
			it("should throw for invalid JSON", async function() {
				await assert.rejects(Controller.loadJsonObject(path.join(dir, "invalid.json")), SyntaxError);
			});
		});
		describe(".loggableHeaders()", function() {
			it("should redact credentials and keep other headers", function() {
				const headers = {
					"authorization": "Bearer secret",
					"x-access-token": "secret",
					"cookie": "a=secret",
					"user-agent": "test",
				};
				assert.deepEqual(Controller.loggableHeaders(headers), {
					"authorization": "[redacted]",
					"x-access-token": "[redacted]",
					"cookie": "[redacted]",
					"user-agent": "test",
				});
				assert.equal(headers["x-access-token"], "secret");
			});
		});

		describe(".serveWeb()", function() {
			let server, port;
			before(async function() {
				const app = express();
				app.locals.controller = { config: { get: () => "Test Cluster" } };
				app.locals.mainBundle = "static/main.abc.js";
				for (let route of ["/", "/instances/:id/view"]) {
					app.get(route, Controller.serveWeb(route));
				}
				server = http.createServer(app);
				server.listen(0, "localhost");
				await events.once(server, "listening");
				port = server.address().port;
			});
			after(function() {
				server.close();
			});
			it("should serve the root with static/ in staticRoot", async function() {
				const html = await (await fetch(`http://localhost:${port}/`)).text();
				assert(html.includes("<title>Test Cluster</title>"));
				assert(html.includes("src=\"./static/main.abc.js\""));
				assert(html.includes("new URL(\"./\", document.location)"));
				assert(html.includes("new URL(\"./static/\", document.location)"));
			});
			it("should use relative roots for nested routes", async function() {
				let html = await (await fetch(`http://localhost:${port}/instances/1/view`)).text();
				assert(html.includes("src=\"../../static/main.abc.js\""));
				assert(html.includes("new URL(\"../../\", document.location)"));
				assert(html.includes("new URL(\"../../static/\", document.location)"));
				html = await (await fetch(`http://localhost:${port}/instances/1/view/`)).text();
				assert(html.includes("src=\"../../../static/main.abc.js\""));
				assert(html.includes("new URL(\"../../../static/\", document.location)"));
			});
		});
		describe(".parseTrustedProxies()", function() {
			it("should parse addresses", function() {
				controller.config.set("controller.trusted_proxies", "10.0.0.1");
				let list = controller.parseTrustedProxies();
				check(list, "10.0.0.1");
				check(list, "10.0.0.2", false);
				controller.config.set("controller.trusted_proxies", "10.0.0.1, 10.0.0.2, 10.1.2.3");
				list = controller.parseTrustedProxies();
				check(list, "10.0.0.1");
				check(list, "10.0.0.2");
				check(list, "10.0.0.3", false);
			});
			it("should ignore invalid entries", function() {
				controller.config.set("controller.trusted_proxies", "10.0.0.1, invalid, 0.0.0.0/200, 10.0.0.2");
				const list = controller.parseTrustedProxies();
				check(list, "10.0.0.1");
				check(list, "10.0.0.2");
				check(list, "10.0.0.3", false);
			});
			it("should parse CIDR blocks", function() {
				controller.config.set("controller.trusted_proxies", "10.0.0.1/24, 192.168.0.16/31");
				const list = controller.parseTrustedProxies();
				check(list, "10.0.0.0");
				check(list, "10.0.0.1");
				check(list, "10.0.0.10");
				check(list, "10.0.0.255");
				check(list, "10.0.1.0", false);
				check(list, "192.168.0.15", false);
				check(list, "192.168.0.16");
				check(list, "192.168.0.17");
				check(list, "192.168.0.18", false);
			});
		});

		describe(".sendRequest()", function() {
			it("should error on loopback", function() {
				assert.throws(
					() => controller.sendRequest(new MockEvent(), Address.fromShorthand("controller")),
					new Error(`Message would return back to sender ${Address.fromShorthand("controller")}.`)
				);
			});
			it("should error on invalid controller", function() {
				assert.throws(
					() => controller.sendRequest(new MockEvent(), Address.fromShorthand({ controlId: 99 })),
					new RequestError("Target control connection does not exist.")
				);
			});
			it("should error on invalid instance", function() {
				assert.throws(
					() => controller.sendRequest(new MockEvent(), Address.fromShorthand({ instanceId: 99 })),
					new RequestError("Instance with ID 99 does not exist")
				);
			});
			it("should error on unassigned instance", function() {
				mockInstanceConfig.set("instance.assigned_host", null);
				assert.throws(
					() => controller.sendRequest(new MockEvent(), Address.fromShorthand({ instanceId: 100 })),
					new RequestError("Instance is not assigned to a host")
				);
			});
			it("should error on instance with disconnected host", function() {
				mockInstanceConfig.set("instance.assigned_host", 99);
				assert.throws(
					() => controller.sendRequest(new MockEvent(), Address.fromShorthand({ instanceId: 100 })),
					new RequestError("Host containing instance is not connected")
				);
			});
			it("should error on invalid host", function() {
				assert.throws(
					() => controller.sendRequest(new MockEvent(), Address.fromShorthand({ hostId: 99 })),
					new RequestError("Host is not connected")
				);
			});
			it("should error on invalid broadcast", function() {
				// This is different to sendEvent because requests do not support broadcasting
				assert.throws(
					() => controller.sendRequest(new MockEvent(), new Address(Address.broadcast, 99)),
					new Error(`Unknown address type ${Address.broadcast}`)
				);
			});
			it("should error on invalid address", function() {
				assert.throws(
					() => controller.sendRequest(new MockEvent(), new Address(99, 99)),
					new Error("Unknown address type 99")
				);
			});
		});

		describe(".sendEvent()", function() {
			it("should error on loopback", function() {
				assert.throws(
					() => controller.sendEvent(new MockEvent(), Address.fromShorthand("controller")),
					new Error(`Message would return back to sender ${Address.fromShorthand("controller")}.`)
				);
			});
			it("should error on invalid controller", function() {
				assert.throws(
					() => controller.sendEvent(new MockEvent(), Address.fromShorthand({ controlId: 99 })),
					new Error("Target control connection does not exist.")
				);
			});
			it("should error on invalid instance", function() {
				assert.throws(
					() => controller.sendEvent(new MockEvent(), Address.fromShorthand({ instanceId: 99 })),
					new Error("Instance with ID 99 does not exist")
				);
			});
			it("should error on unassigned instance", function() {
				mockInstanceConfig.set("instance.assigned_host", null);
				assert.throws(
					() => controller.sendEvent(new MockEvent(), Address.fromShorthand({ instanceId: 100 })),
					new Error("Instance is not assigned to a host")
				);
			});
			it("should error on instance with disconnected host", function() {
				mockInstanceConfig.set("instance.assigned_host", 99);
				assert.throws(
					() => controller.sendEvent(new MockEvent(), Address.fromShorthand({ instanceId: 100 })),
					new Error("Host containing instance is not connected")
				);
			});
			it("should error on invalid host", function() {
				assert.throws(
					() => controller.sendEvent(new MockEvent(), Address.fromShorthand({ hostId: 99 })),
					new Error("Host is not connected")
				);
			});
			it("should error on invalid broadcast", function() {
				assert.throws(
					() => controller.sendEvent(new MockEvent(), new Address(Address.broadcast, 99)),
					new Error("Unexpected broadcast target 99")
				);
			});
			it("should error on invalid address", function() {
				assert.throws(
					() => controller.sendEvent(new MockEvent(), new Address(99, 99)),
					new Error("Unknown address type 99")
				);
			});
		});

		function mockPermissionChanges() {
			const role = new Role(1, "Test", "", new Set(["core.log.follow"]));
			const otherRole = new Role(2, "Other", "", new Set());
			const user = { roles: new Set([role]) };
			const otherUser = { roles: new Set([otherRole]) };
			const sent = [];
			const checked = [];
			const connection = {
				user,
				logChecked: false,
				send(message) { sent.push(message); },
				checkLogPermission() { this.logChecked = true; },
			};
			const otherConnection = {
				user: otherUser,
				send(message) { sent.push(message); },
				checkLogPermission() {},
			};
			const originalWsServer = controller.wsServer;
			controller.wsServer = { controlConnections: new Map([[1, connection], [2, otherConnection]]) };
			controller.subscriptions.checkLinkPermissions = (link, linkUser) => checked.push([link, linkUser]);
			return {
				role, user, connection, sent, checked,
				restore() {
					controller.wsServer = originalWsServer;
					delete controller.subscriptions.checkLinkPermissions;
				},
			};
		}
		function assertAccountUpdate(sent, role) {
			assert.equal(sent.length, 1);
			assert(sent[0] instanceof AccountUpdateEvent);
			assert.deepEqual(sent[0].roles, [{ name: role.name, id: role.id, permissions: [...role.permissions] }]);
		}

		describe(".userPermissionsUpdated()", function() {
			let mocked;
			beforeEach(function() { mocked = mockPermissionChanges(); });
			afterEach(function() { mocked.restore(); });
			it("should send an account update to connections of the user", function() {
				controller.userPermissionsUpdated(mocked.user);
				assertAccountUpdate(mocked.sent, mocked.role);
			});
			it("should recheck subscriptions and log following of the user", function() {
				controller.userPermissionsUpdated(mocked.user);
				assert.deepEqual(mocked.checked, [[mocked.connection, mocked.user]]);
				assert(mocked.connection.logChecked, "log permission was not checked");
			});
		});

		describe(".rolesUpdated()", function() {
			let mocked;
			beforeEach(function() { mocked = mockPermissionChanges(); });
			afterEach(function() { mocked.restore(); });
			it("should send an account update to connections with the role", function() {
				controller.rolesUpdated([mocked.role]);
				assertAccountUpdate(mocked.sent, mocked.role);
			});
			it("should recheck subscriptions and log following of users with the role", function() {
				controller.rolesUpdated([mocked.role]);
				assert.deepEqual(mocked.checked, [[mocked.connection, mocked.user]]);
				assert(mocked.connection.logChecked, "log permission was not checked");
			});
		});

		describe(".instances", function() {
			it("should set the dirty flag if the config is updated", function() {
				controller.instances.records.dirty = false;
				mockInstanceConfig.set("instance.assigned_host", null);
				assert(controller.instances.records.dirty === true, "dirty flag was not set");
			});
		});
		describe(".checkRestartRequired()", function() {
			before(function() {
				addPluginConfigFields([{ name: "restart_test" }]);
			});
			beforeEach(function() {
				// Would not be needed if controller setup was beforeEach
				controller.config.set("controller.version", controllerVersion);
				controller.config.set("restart_test.load_plugin", true);
				controller.config.restartRequired = false;
				controller.pluginInfos[0] = {
					name: "restart_test",
					packagePath: fileURLToPath(import.meta.resolve("@clusterio/controller/package.json")),
					version: controllerVersion,
				};
			});
			it("returns false when no changes are present", async function() {
				controller.pluginInfos[0].webEntrypoint = true;
				controller.pluginInfos[0].controllerEntrypoint = true;
				const result = await controller.checkRestartRequired();
				assert.equal(result, false);
				assert.equal(controller.config.restartRequired, false);
			});
			it("returns false when an unloaded plugin version changes", async function() {
				controller.pluginInfos[0].version = "0.0.0";
				controller.pluginInfos[0].webEntrypoint = true;
				controller.pluginInfos[0].controllerEntrypoint = true;
				controller.config.set("restart_test.load_plugin", false);
				controller.config.restartRequired = false; // Setting load_plugin requires a restart
				const result = await controller.checkRestartRequired();
				assert.equal(result, false);
				assert.equal(controller.config.restartRequired, false);
			});
			it("returns true when the config flag is set", async function() {
				controller.config.restartRequired = true;
				const result = await controller.checkRestartRequired();
				assert.equal(result, true);
				assert.equal(controller.config.restartRequired, true);
			});
			it("returns true when clusterio version changes", async function() {
				controller.config.set("controller.version", "0.0.0");
				const result = await controller.checkRestartRequired();
				assert.equal(result, true);
				assert.equal(controller.config.restartRequired, true);
			});
			it("returns true when a controller plugin version changes", async function() {
				controller.pluginInfos[0].version = "0.0.0";
				controller.pluginInfos[0].controllerEntrypoint = true;
				const result = await controller.checkRestartRequired();
				assert.equal(result, true);
				assert.equal(controller.config.restartRequired, true);
			});
			it("returns true when a web plugin version changes", async function() {
				controller.pluginInfos[0].version = "0.0.0";
				controller.pluginInfos[0].webEntrypoint = true;
				const result = await controller.checkRestartRequired();
				assert.equal(result, true);
				assert.equal(controller.config.restartRequired, true);
			});
		});
		describe(".checkRestartDowngrade()", function() {
			it("returns null when the installed version matches", async function() {
				controller.config.set("controller.version", controllerVersion);
				assert.equal(await controller.checkRestartDowngrade(), null);
			});
			it("returns null when the installed version is newer", async function() {
				controller.config.set("controller.version", "0.0.0");
				assert.equal(await controller.checkRestartDowngrade(), null);
			});
			it("returns both versions when the installed version is older", async function() {
				controller.config.set("controller.version", "999.0.0");
				assert.deepEqual(await controller.checkRestartDowngrade(), {
					installedVersion: controllerVersion,
					runningVersion: "999.0.0",
				});
			});
		});

		describe(".factorioVersions", function() {
			const _fetch = global.fetch;
			const fetchCalls = [];
			before(function() {
				global.fetch = async (url) => {
					fetchCalls.push(url);
					return { ok: false, status: 503, statusText: "Service Unavailable" };
				};
			});
			it("should handle fetch failure", async function() {
				await assert.deepEqual(
					await controller.factorioVersions.get(0),
					[],
				);
				assert(fetchCalls.length === 1, "expected one fetch call");
				assert(fetchCalls[0].indexOf("/download") !== -1, "fetch call to be to a URL with /download in it");
			});
			after(function() {
				global.fetch = _fetch;
			});
		});
	});
	describe("finalise", function() {
		describe(".finaliseHosts()", function() {
			it("resets the connected state to false", function() {
				const hostInfo = new HostRecord(1, "", "", new Map(), true);
				Controller.finaliseHosts(hostInfo);
				assert.equal(hostInfo.connected, false);
				assert(hostInfo.updatedAtMs > 0, "updatedAtMs not incremented");
			});
			it("does not increment updatedAtMs when there are no changes", function() {
				const hostInfo = new HostRecord(1, "", "", new Map(), false);
				Controller.finaliseHosts(hostInfo);
				assert.equal(hostInfo.connected, false);
				assert(hostInfo.updatedAtMs === 0, "updatedAtMs incremented");
			});
		});
		describe(".finaliseInstances()", function() {
			it("resets the stats for assigned instances", function() {
				const instanceConfig = new InstanceConfig("controller", { "instance.assigned_host": 1 });
				const instanceRecord = new InstanceRecord(instanceConfig, "running");
				Controller.finaliseInstances(instanceRecord);
				assert.equal(instanceRecord.status, "unknown");
				assert(instanceRecord.updatedAtMs > 0, "updatedAtMs not incremented");
			});
			it("resets the status for unassigned instances", function() {
				const instanceConfig = new InstanceConfig("controller", { "instance.assigned_host": null });
				const instanceRecord = new InstanceRecord(instanceConfig, "running");
				Controller.finaliseInstances(instanceRecord);
				assert.equal(instanceRecord.status, "unassigned");
				assert(instanceRecord.updatedAtMs > 0, "updatedAtMs not incremented");
			});
			it("does not update updatedAtMs when there are no changes (assigned)", function() {
				const instanceConfig = new InstanceConfig("controller", { "instance.assigned_host": 1 });
				const instanceRecord = new InstanceRecord(instanceConfig, "unknown");
				Controller.finaliseInstances(instanceRecord);
				assert.equal(instanceRecord.status, "unknown");
				assert(instanceRecord.updatedAtMs === 0, "updatedAtMs incremented");
			});
			it("does not update updatedAtMs when there are no changes (unassigned)", function() {
				const instanceConfig = new InstanceConfig("controller", { "instance.assigned_host": null });
				const instanceRecord = new InstanceRecord(instanceConfig, "unassigned");
				Controller.finaliseInstances(instanceRecord);
				assert.equal(instanceRecord.status, "unassigned");
				assert(instanceRecord.updatedAtMs === 0, "updatedAtMs incremented");
			});
		});
		describe(".finaliseUsers()", function() {
			it("returns the user when there is no existing user", function() {
				const user = new UserRecord(0, "TestUser", new Set([1]));
				user.playerStats.onlineTimeMs = 100;

				const users = new Map();
				const result = Controller.finaliseUsers(user, users);
				assert.equal(users.size, 0);
				assert.equal(result, user);
			});
			it("does not merge users with different ids", function() {
				const existingUser = new UserRecord(0, "UserOne", new Set([1]));
				existingUser.playerStats.onlineTimeMs = 100;

				const otherUser = new UserRecord(0, "UserTwo", new Set([2]));
				otherUser.playerStats.onlineTimeMs = 50;

				const users = new Map([[existingUser.id, existingUser]]);
				const result = Controller.finaliseUsers(otherUser, users);
				assert.equal(users.size, 1);
				assert.equal(result, otherUser);
				assert(!result.roleIds.has(1), "users were merged");
			});
			it("merges into existing user when onlineTimeMs is lower", function() {
				const existingUser = new UserRecord(0, "TestUser", new Set([1]));
				existingUser.playerStats.onlineTimeMs = 100;

				const user = new UserRecord(0, "TestUser", new Set([2]));
				user.playerStats.onlineTimeMs = 50;

				const users = new Map([[existingUser.id, existingUser]]);
				const result = Controller.finaliseUsers(user, users);
				assert.equal(users.size, 1);
				assert.equal(result, existingUser);
				assert(result.roleIds.has(2), "other user not merged");
			});
			it("merges into existing user when onlineTimeMs is equal", function() {
				const existingUser = new UserRecord(0, "TestUser", new Set([1]));
				existingUser.playerStats.onlineTimeMs = 100;

				const user = new UserRecord(0, "TestUser", new Set([2]));
				user.playerStats.onlineTimeMs = 100;

				const users = new Map([[existingUser.id, existingUser]]);
				const result = Controller.finaliseUsers(user, users);
				assert.equal(users.size, 1);
				assert.equal(result, existingUser);
				assert(result.roleIds.has(2), "other user not merged");
			});
			it("merges existing user into new user when onlineTimeMs is higher", function() {
				const existingUser = new UserRecord(0, "TestUser", new Set([1]));
				existingUser.playerStats.onlineTimeMs = 50;

				const user = new UserRecord(0, "TestUser", new Set([2]));
				user.playerStats.onlineTimeMs = 100;

				const users = new Map([[existingUser.id, existingUser]]);
				const result = Controller.finaliseUsers(user, users);
				assert.equal(users.size, 1);
				assert.equal(result, user);
				assert(result.roleIds.has(1), "existing user not merged");
			});
		});
	});
	describe("migrations", function() {
		describe(".migrateSystems()", function() {
			it("migrates 'canRestart' from undefined to false", function() { // Alpha 17
				const result = Controller.migrateSystems([
					{}, { canRestart: true }, { canRestart: false },
				]);
				assert.equal(result[0].canRestart, false);
				assert.equal(result[1].canRestart, true);
				assert.equal(result[2].canRestart, false);
			});
			it("migrates 'restartRequired' from undefined to false", function() { // Alpha 21
				const result = Controller.migrateSystems([
					{}, { restartRequired: true }, { restartRequired: false },
				]);
				assert.equal(result[0].restartRequired, false);
				assert.equal(result[1].restartRequired, true);
				assert.equal(result[2].restartRequired, false);
			});
			it("migrates 'systemStartedAtMs' from undefined to Date.now", function() { // Alpha 23
				const result = Controller.migrateSystems([
					{}, { systemStartedAtMs: 0 }, { systemStartedAtMs: 500 },
				]);
				const now = Date.now();
				const r0 = result[0].systemStartedAtMs;
				assert.ok(r0 > now - 100 && r0 <= now);
				assert.equal(result[1].systemStartedAtMs, 0);
				assert.equal(result[2].systemStartedAtMs, 500);
			});
			it("migrates 'processStartedAtMs' from undefined to Date.now", function() { // Alpha 23
				const result = Controller.migrateSystems([
					{}, { processStartedAtMs: 0 }, { processStartedAtMs: 500 },
				]);
				const now = Date.now();
				const r0 = result[0].processStartedAtMs;
				assert.ok(r0 > now - 100 && r0 <= now);
				assert.equal(result[1].processStartedAtMs, 0);
				assert.equal(result[2].processStartedAtMs, 500);
			});
			it("does nothing for upto date data", function() {
				const systemInfo = new SystemInfo(
					1, "name", "n", "k", "m", "cm", "cr", "mc", "ma", "dc", "da", false, false, 0, 0, 0, false
				);
				const jsonString = JSON.stringify(systemInfo);
				const systemInfoJson = JSON.parse(jsonString);
				const systemInfoJsonCopy = JSON.parse(jsonString);
				const result = Controller.migrateSystems([
					systemInfoJson, systemInfoJson, systemInfoJson,
				]);
				assert.deepEqual(result, [
					systemInfoJsonCopy, systemInfoJsonCopy, systemInfoJsonCopy,
				]);
			});
		});
		describe(".migrateHosts()", function() {
			it("migrates to the new format", function() { // Alpha 19
				const result = Controller.migrateHosts([
					["", "foo"], ["", "bar"], ["", "baz"],
				]);
				assert.deepEqual(result, [
					"foo", "bar", "baz",
				]);
			});
			it("does nothing for upto date data", function() {
				const hostInfo = new HostRecord(1, "", "", new Map());
				const jsonString = JSON.stringify(hostInfo);
				const hostInfoJson = JSON.parse(jsonString);
				const hostInfoJsonCopy = JSON.parse(jsonString);
				const result = Controller.migrateHosts([
					hostInfoJson, hostInfoJson, hostInfoJson,
				]);
				assert.deepEqual(result, [
					hostInfoJsonCopy, hostInfoJsonCopy, hostInfoJsonCopy,
				]);
			});
		});
		describe(".migrateInstances()", function() {
			it("migrates to the new format", function() { // Alpha 14
				const result = Controller.migrateInstances([
					{ name: "foo" }, { name: "bar" }, { name: "baz" },
				]);
				assert.deepEqual(result, [
					{ config: { name: "foo" }, status: "running" },
					{ config: { name: "bar" }, status: "running" },
					{ config: { name: "baz" }, status: "running" },
				]);
			});
			it("does nothing for upto date data", function() {
				const instanceConfig = new InstanceConfig("controller");
				const instanceRecord = new InstanceRecord(instanceConfig, "unknown");
				const jsonString = JSON.stringify(instanceRecord);
				const instanceRecordJson = JSON.parse(jsonString);
				const instanceRecordJsonCopy = JSON.parse(jsonString);
				const result = Controller.migrateInstances([
					instanceRecordJson, instanceRecordJson, instanceRecordJson,
				]);
				assert.deepEqual(result, [
					instanceRecordJsonCopy, instanceRecordJsonCopy, instanceRecordJsonCopy,
				]);
			});
		});
		describe(".migrateModPacks()", function() {
			it("migrates builtin mod versions to X.Y.Z", function() {
				const modPacks = Controller.migrateModPacks([{
					id: 0,
					name: "name",
					factorio_version: "2.0",
					mods: [
						{ name: "base", version: "2.0" },
						{ name: "my-mod", version: "1.0.0" },
					],
				}]);
				assert.deepEqual(modPacks, [{
					id: 0,
					name: "name",
					factorio_version: "2.0",
					mods: [
						{ name: "base", version: "2.0.0" },
						{ name: "my-mod", version: "1.0.0" },
					],
				}]);
			});
			it("does nothing for upto date data", function() {
				const modPack = ModPack.fromJSON({
					id: 0,
					name: "name",
					factorio_version: "2.0",
					mods: [
						{ name: "base", version: "2.0.0" },
						{ name: "my-mod", version: "1.0.0" },
					],
				});
				const jsonString = JSON.stringify(modPack);
				const modPackJson = JSON.parse(jsonString);
				const modPackJsonCopy = JSON.parse(jsonString);
				const result = Controller.migrateModPacks([
					modPackJson, modPackJson, modPackJson,
				]);
				assert.deepEqual(result, [
					modPackJsonCopy, modPackJsonCopy, modPackJsonCopy,
				]);
			});
		});
		describe(".migrateRoles()", function() {
			it("migrates renamed permissions", function() { // Alpha 17
				const result = Controller.migrateRoles([
					{ permissions: ["foo", "bar", "core.instance.save.list.subscribe"] },
					{ permissions: ["bar", "core.instance.save.list.subscribe"] },
					{ permissions: ["core.instance.save.subscribe"] },
				]);
				assert.deepEqual(result, [
					{ permissions: ["foo", "bar", "core.instance.save.subscribe"] },
					{ permissions: ["bar", "core.instance.save.subscribe"] },
					{ permissions: ["core.instance.save.subscribe"] },
				]);
			});
			it("does nothing for upto date data", function() {
				const role = new Role(
					0, "n", "d", new Set("p1", "p2"), 0, false
				);
				const jsonString = JSON.stringify(role);
				const roleJson = JSON.parse(jsonString);
				const roleJsonCopy = JSON.parse(jsonString);
				const result = Controller.migrateRoles([
					roleJson, roleJson, roleJson,
				]);
				assert.deepEqual(result, [
					roleJsonCopy, roleJsonCopy, roleJsonCopy,
				]);
			});
		});
	});
});