import { expect } from 'chai';
import { stub, SinonStub } from 'sinon';
import * as Docker from 'dockerode';
import * as request from 'supertest';
import { setTimeout } from 'timers/promises';

import * as deviceState from '~/src/device-state';
import * as deviceApi from '~/src/device-api';
import * as actions from '~/src/device-api/actions';
import { cleanupDocker } from '~/test-lib/docker-helper';

describe('regenerates API keys', () => {
	// Stub external dependency - current state report should be tested separately.
	// API key related methods are tested in api-keys.spec.ts.
	beforeEach(() => stub(deviceState, 'reportCurrentState'));
	afterEach(() => (deviceState.reportCurrentState as SinonStub).restore());

	it("communicates new key to cloud if it's a global key", async () => {
		const originalGlobalKey = await deviceApi.getGlobalApiKey();
		const newKey = await actions.regenerateKey(originalGlobalKey);
		expect(originalGlobalKey).to.not.equal(newKey);
		expect(newKey).to.equal(await deviceApi.getGlobalApiKey());
		expect(deviceState.reportCurrentState as SinonStub).to.have.been.calledOnce;
		expect(
			(deviceState.reportCurrentState as SinonStub).firstCall.args[0],
		).to.deep.equal({
			api_secret: newKey,
		});
	});

	it("doesn't communicate new key if it's a service key", async () => {
		const originalScopedKey = await deviceApi.generateScopedKey(111, 'main');
		const newKey = await actions.regenerateKey(originalScopedKey);
		expect(originalScopedKey).to.not.equal(newKey);
		expect(newKey).to.not.equal(await deviceApi.getGlobalApiKey());
		expect(deviceState.reportCurrentState as SinonStub).to.not.have.been.called;
	});
});

// TODO: test all the container stop / start / recreate / purge related actions
// together here to avoid repeated setup of containers and images.
describe('manages application lifecycle', () => {
	const BASE_IMAGE = 'alpine:latest';
	const BALENA_SUPERVISOR_ADDRESS =
		process.env.BALENA_SUPERVISOR_ADDRESS || 'http://balena-supervisor:48484';
	const APP_ID = 1;
	const docker = new Docker();

	const getSupervisorTarget = async () =>
		await request(BALENA_SUPERVISOR_ADDRESS)
			.get('/v2/local/target-state')
			.expect(200)
			.then(({ body }) => body.state.local);

	const setSupervisorTarget = async (
		target: Awaited<ReturnType<typeof generateTarget>>,
	) =>
		await request(BALENA_SUPERVISOR_ADDRESS)
			.post('/v2/local/target-state')
			.set('Content-Type', 'application/json')
			.send(JSON.stringify(target))
			.expect(200);

	const generateTargetApps = ({
		serviceCount,
		appId,
		serviceNames,
	}: {
		serviceCount: number;
		appId: number;
		serviceNames: string[];
	}) => {
		// Populate app services
		const services: Dictionary<any> = {};
		for (let i = 1; i <= serviceCount; i++) {
			services[i] = {
				environment: {},
				image: BASE_IMAGE,
				imageId: `${i}`,
				labels: {
					'io.balena.testing': '1',
				},
				restart: 'unless-stopped',
				running: true,
				serviceName: serviceNames[i - 1],
				serviceId: `${i}`,
				volumes: ['data:/data'],
				command: 'sleep infinity',
				// Kill container immediately instead of waiting for 10s
				stop_signal: 'SIGKILL',
			};
		}

		return {
			[appId]: {
				name: 'localapp',
				commit: 'localcommit',
				releaseId: '1',
				services,
				volumes: {
					data: {},
				},
			},
		};
	};

	const generateTarget = async ({
		serviceCount,
		appId = APP_ID,
		serviceNames = ['server', 'client'],
	}: {
		serviceCount: number;
		appId?: number;
		serviceNames?: string[];
	}) => {
		const { name, config } = await getSupervisorTarget();
		return {
			local: {
				// We don't want to change name or config as this may result in
				// unintended reboots. We just want to test state changes in containers.
				name,
				config,
				apps:
					serviceCount === 0
						? {}
						: generateTargetApps({
								serviceCount,
								appId,
								serviceNames,
						  }),
			},
		};
	};

	// Wait until containers are in a ready state prior to testing assertions
	const waitForSetup = async (
		targetState: Dictionary<any>,
		isWaitComplete: (ctns: Docker.ContainerInspectInfo[]) => boolean = (ctns) =>
			ctns.every((ctn) => ctn.State.Running),
	) => {
		// Get expected number of containers from target state
		const expected = Object.keys(
			targetState.local.apps[`${APP_ID}`].services,
		).length;

		// Wait for engine until number of containers are reached.
		// This test suite will timeout if anything goes wrong, since
		// we don't have any way of knowing whether Docker has finished
		// setting up containers or not.
		while (true) {
			const containers = await docker.listContainers({ all: true });
			const containerInspects = await Promise.all(
				containers.map(({ Id }) => docker.getContainer(Id).inspect()),
			);
			if (expected === containers.length && isWaitComplete(containerInspects)) {
				return containerInspects;
			} else {
				await setTimeout(500);
			}
		}
	};

	// Get NEW container inspects. This function should be passed to waitForSetup
	// when checking a container has started or been recreated. This is necessary
	// because waitForSetup may erroneously return the existing 2 containers
	// in its while loop if stopping them takes some time.
	const startTimesChanged = (startedAt: string[]) => {
		return (ctns: Docker.ContainerInspectInfo[]) =>
			ctns.every(({ State }) => !startedAt.includes(State.StartedAt));
	};

	before(async () => {
		// Images are ignored in local mode so we need to pull the base image
		await docker.pull(BASE_IMAGE);
		// Wait for base image to finish pulling
		while (true) {
			const images = await docker.listImages();
			if (images.length > 0) {
				break;
			}
			await setTimeout(500);
		}
	});

	after(async () => {
		// Reset Supervisor to state from before lifecycle tests
		await setSupervisorTarget(await generateTarget({ serviceCount: 0 }));

		// Remove any leftover engine artifacts
		await cleanupDocker(docker);
	});

	describe('manages single container application lifecycle', () => {
		const serviceCount = 1;
		const serviceNames = ['server'];
		let targetState: Awaited<ReturnType<typeof generateTarget>>;
		let containers: Docker.ContainerInspectInfo[];

		before(async () => {
			targetState = await generateTarget({
				serviceCount,
				serviceNames,
			});
		});

		beforeEach(async () => {
			// Create a single-container application in local mode
			await setSupervisorTarget(targetState);
		});

		// Make sure the app is running and correct before testing more assertions
		it('should setup a single container app (sanity check)', async () => {
			containers = await waitForSetup(targetState);
			// Containers should have correct metadata;
			// Testing their names should be sufficient.
			containers.forEach((ctn) => {
				expect(serviceNames.some((name) => new RegExp(name).test(ctn.Name))).to
					.be.true;
			});
		});

		it('should restart an application by recreating containers', async () => {
			containers = await waitForSetup(targetState);
			const isRestartSuccessful = startTimesChanged(
				containers.map((ctn) => ctn.State.StartedAt),
			);

			await actions.doRestart(APP_ID);

			const restartedContainers = await waitForSetup(
				targetState,
				isRestartSuccessful,
			);

			// Technically the wait function above should already verify that the two
			// containers have been restarted, but verify explcitly with an assertion
			expect(isRestartSuccessful(restartedContainers)).to.be.true;

			// Containers should have different Ids since they're recreated
			expect(restartedContainers.map(({ Id }) => Id)).to.not.have.members(
				containers.map((ctn) => ctn.Id),
			);
		});

		// This test should be ordered last in this `describe` block, because the test compares
		// the `CreatedAt` timestamps of volumes to determine whether purge was successful. Thus,
		// ordering the assertion last will ensure some time has passed between the first `CreatedAt`
		// and the `CreatedAt` extracted from the new volume to pass this assertion.
		it('should purge an application by removing services then removing volumes', async () => {
			containers = await waitForSetup(targetState);
			const isRestartSuccessful = startTimesChanged(
				containers.map((ctn) => ctn.State.StartedAt),
			);

			// Get volume metadata. As the name stays the same, we just need to check that the volume
			// has been deleted & recreated. We can use the CreatedAt timestamp to determine this.
			const volume = (await docker.listVolumes()).Volumes.find((vol) =>
				/data/.test(vol.Name),
			);
			if (!volume) {
				expect.fail('Expected initial volume with name matching "data"');
			}
			// CreatedAt is a valid key but isn't typed properly
			const createdAt = (volume as any).CreatedAt;

			// Calling actions.doPurge won't work as intended because purge relies on
			// setting and applying intermediate state before applying target state again,
			// but target state is set in the balena-supervisor container instead of sut.
			// NOTE: if running ONLY this test, it has a chance of failing since the first and
			// second volume creation happen in quick succession (sometimes in the same second).
			await request(BALENA_SUPERVISOR_ADDRESS)
				.post('/v1/purge')
				.set('Content-Type', 'application/json')
				.send(JSON.stringify({ appId: 1 }));

			const restartedContainers = await waitForSetup(
				targetState,
				isRestartSuccessful,
			);

			// Technically the wait function above should already verify that the two
			// containers have been restarted, but verify explcitly with an assertion
			expect(isRestartSuccessful(restartedContainers)).to.be.true;

			// Containers should have different Ids since they're recreated
			expect(restartedContainers.map(({ Id }) => Id)).to.not.have.members(
				containers.map((ctn) => ctn.Id),
			);

			// Volume should be recreated
			const newVolume = (await docker.listVolumes()).Volumes.find((vol) =>
				/data/.test(vol.Name),
			);
			if (!volume) {
				expect.fail('Expected recreated volume with name matching "data"');
			}
			expect((newVolume as any).CreatedAt).to.not.equal(createdAt);
		});
	});

	describe('manages multi-container application lifecycle', () => {
		const serviceCount = 2;
		const serviceNames = ['server', 'client'];
		let targetState: Awaited<ReturnType<typeof generateTarget>>;
		let containers: Docker.ContainerInspectInfo[];

		before(async () => {
			targetState = await generateTarget({
				serviceCount,
				serviceNames,
			});
		});

		beforeEach(async () => {
			// Create a multi-container application in local mode
			await setSupervisorTarget(targetState);
		});

		// Make sure the app is running and correct before testing more assertions
		it('should setup a multi-container app (sanity check)', async () => {
			containers = await waitForSetup(targetState);
			// Containers should have correct metadata;
			// Testing their names should be sufficient.
			containers.forEach((ctn) => {
				expect(serviceNames.some((name) => new RegExp(name).test(ctn.Name))).to
					.be.true;
			});
		});

		it('should restart an application by recreating containers', async () => {
			containers = await waitForSetup(targetState);
			const isRestartSuccessful = startTimesChanged(
				containers.map((ctn) => ctn.State.StartedAt),
			);

			await actions.doRestart(APP_ID);

			const restartedContainers = await waitForSetup(
				targetState,
				isRestartSuccessful,
			);

			// Technically the wait function above should already verify that the two
			// containers have been restarted, but verify explcitly with an assertion
			expect(isRestartSuccessful(restartedContainers)).to.be.true;

			// Containers should have different Ids since they're recreated
			expect(restartedContainers.map(({ Id }) => Id)).to.not.have.members(
				containers.map((ctn) => ctn.Id),
			);
		});

		// This test should be ordered last in this `describe` block, because the test compares
		// the `CreatedAt` timestamps of volumes to determine whether purge was successful. Thus,
		// ordering the assertion last will ensure some time has passed between the first `CreatedAt`
		// and the `CreatedAt` extracted from the new volume to pass this assertion.
		it('should purge an application by removing services then removing volumes', async () => {
			containers = await waitForSetup(targetState);
			const isRestartSuccessful = startTimesChanged(
				containers.map((ctn) => ctn.State.StartedAt),
			);

			// Get volume metadata. As the name stays the same, we just need to check that the volume
			// has been deleted & recreated. We can use the CreatedAt timestamp to determine this.
			const volume = (await docker.listVolumes()).Volumes.find((vol) =>
				/data/.test(vol.Name),
			);
			if (!volume) {
				expect.fail('Expected initial volume with name matching "data"');
			}
			// CreatedAt is a valid key but isn't typed properly
			const createdAt = (volume as any).CreatedAt;

			// Calling actions.doPurge won't work as intended because purge relies on
			// setting and applying intermediate state before applying target state again,
			// but target state is set in the balena-supervisor container instead of sut.
			// NOTE: if running ONLY this test, it has a chance of failing since the first and
			// second volume creation happen in quick succession (sometimes in the same second).
			await request(BALENA_SUPERVISOR_ADDRESS)
				.post('/v1/purge')
				.set('Content-Type', 'application/json')
				.send(JSON.stringify({ appId: 1 }));

			const restartedContainers = await waitForSetup(
				targetState,
				isRestartSuccessful,
			);

			// Technically the wait function above should already verify that the two
			// containers have been restarted, but verify explcitly with an assertion
			expect(isRestartSuccessful(restartedContainers)).to.be.true;

			// Containers should have different Ids since they're recreated
			expect(restartedContainers.map(({ Id }) => Id)).to.not.have.members(
				containers.map((ctn) => ctn.Id),
			);

			// Volume should be recreated
			const newVolume = (await docker.listVolumes()).Volumes.find((vol) =>
				/data/.test(vol.Name),
			);
			if (!volume) {
				expect.fail('Expected recreated volume with name matching "data"');
			}
			expect((newVolume as any).CreatedAt).to.not.equal(createdAt);
		});
	});
});