/*
Copyright 2016-2020 Balena

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import * as _ from 'lodash';
import { getBalenaSdk, getVisuals } from '../utils/lazy';
import * as dockerUtils from '../utils/docker';

const isCurrent = (commit) => commit === 'latest' || commit === 'current';

let allDeviceTypes;
const getDeviceTypes = function () {
	const Bluebird = require('bluebird');
	if (allDeviceTypes !== undefined) {
		return Bluebird.resolve(allDeviceTypes);
	}
	const balena = getBalenaSdk();
	return balena.models.config
		.getDeviceTypes()
		.then((deviceTypes) => _.sortBy(deviceTypes, 'name'))
		.tap((dt) => {
			allDeviceTypes = dt;
		});
};

const getDeviceTypesWithSameArch = function (deviceTypeSlug) {
	return getDeviceTypes().then(function (deviceTypes) {
		const deviceType = _.find(deviceTypes, { slug: deviceTypeSlug });
		return _(deviceTypes).filter({ arch: deviceType.arch }).map('slug').value();
	});
};

const getApplicationsWithSuccessfulBuilds = function (deviceType) {
	const balenaPreload = require('balena-preload');
	const balena = getBalenaSdk();

	return getDeviceTypesWithSameArch(deviceType).then((deviceTypes) => {
		/** @type {import('balena-sdk').PineOptionsFor<import('balena-sdk').Application>} */
		const options = {
			$filter: {
				device_type: {
					$in: deviceTypes,
				},
				owns__release: {
					$any: {
						$alias: 'r',
						$expr: {
							r: {
								status: 'success',
							},
						},
					},
				},
			},
			$expand: balenaPreload.applicationExpandOptions,
			$select: [
				'id',
				'app_name',
				'device_type',
				'commit',
				'should_track_latest_release',
			],
			$orderby: 'app_name asc',
		};
		return balena.pine.get({
			resource: 'my_application',
			options,
		});
	});
};

const selectApplication = function (deviceType) {
	const visuals = getVisuals();
	const form = require('resin-cli-form');
	const { exitWithExpectedError } = require('../errors');

	const applicationInfoSpinner = new visuals.Spinner(
		'Downloading list of applications and releases.',
	);
	applicationInfoSpinner.start();

	return getApplicationsWithSuccessfulBuilds(deviceType).then(function (
		applications,
	) {
		applicationInfoSpinner.stop();
		if (applications.length === 0) {
			exitWithExpectedError(
				`You have no apps with successful releases for a '${deviceType}' device type.`,
			);
		}
		return form.ask({
			message: 'Select an application',
			type: 'list',
			choices: applications.map((app) => ({
				name: app.app_name,
				value: app,
			})),
		});
	});
};

const selectApplicationCommit = function (releases) {
	const form = require('resin-cli-form');
	const { exitWithExpectedError } = require('../errors');

	if (releases.length === 0) {
		exitWithExpectedError('This application has no successful releases.');
	}
	const DEFAULT_CHOICE = { name: 'current', value: 'current' };
	const choices = [DEFAULT_CHOICE].concat(
		releases.map((release) => ({
			name: `${release.end_timestamp} - ${release.commit}`,
			value: release.commit,
		})),
	);
	return form.ask({
		message: 'Select a release',
		type: 'list',
		default: 'current',
		choices,
	});
};

const offerToDisableAutomaticUpdates = function (
	application,
	commit,
	pinDevice,
) {
	const Promise = require('bluebird');
	const balena = getBalenaSdk();
	const form = require('resin-cli-form');

	if (
		isCurrent(commit) ||
		!application.should_track_latest_release ||
		pinDevice
	) {
		return Promise.resolve();
	}
	const message = `\

This application is set to automatically update all devices to the current version.
This might be unexpected behavior: with this enabled, the preloaded device will still
download and install the current release once it is online.

Do you want to disable automatic updates for this application?

Warning: To re-enable this requires direct api calls,
see https://balena.io/docs/reference/api/resources/device/#set-device-to-release

Alternatively you can pass the --pin-device-to-release flag to pin only this device to the selected release.\
`;
	return form
		.ask({
			message,
			type: 'confirm',
		})
		.then(function (update) {
			if (!update) {
				return;
			}
			return balena.pine.patch({
				resource: 'application',
				id: application.id,
				body: {
					should_track_latest_release: false,
				},
			});
		});
};

const preloadOptions = dockerUtils.appendConnectionOptions([
	{
		signature: 'app',
		parameter: 'appId',
		description: 'id of the application to preload',
		alias: 'a',
	},
	{
		signature: 'commit',
		parameter: 'hash',
		description: `\
The commit hash for a specific application release to preload, use "current" to specify the current
release (ignored if no appId is given). The current release is usually also the latest, but can be
manually pinned using https://github.com/balena-io-projects/staged-releases .\
`,
		alias: 'c',
	},
	{
		signature: 'splash-image',
		parameter: 'splashImage.png',
		description: 'path to a png image to replace the splash screen',
		alias: 's',
	},
	{
		signature: 'dont-check-arch',
		boolean: true,
		description:
			'Disables check for matching architecture in image and application',
	},
	{
		signature: 'pin-device-to-release',
		boolean: true,
		description:
			'Pin the preloaded device to the preloaded release on provision',
		alias: 'p',
	},
	{
		signature: 'add-certificate',
		parameter: 'certificate.crt',
		description: `\
Add the given certificate (in PEM format) to /etc/ssl/certs in the preloading container.
The file name must end with '.crt' and must not be already contained in the preloader's
/etc/ssl/certs folder.
Can be repeated to add multiple certificates.\
`,
	},
]);
// Remove dockerPort `-p` alias as it conflicts with pin-device-to-release
delete _.find(preloadOptions, { signature: 'dockerPort' }).alias;

export const preload = {
	signature: 'preload <image>',
	description: 'preload an app on a disk image (or Edison zip archive)',
	help: `\
Preload a balena application release (app images/containers), and optionally
a balenaOS splash screen, in a previously downloaded '.img' balenaOS image file
in the local disk (a zip file is only accepted for the Intel Edison device type).
After preloading, the balenaOS image file can be flashed to a device's SD card.
When the device boots, it will not need to download the application, as it was
preloaded.

Warning: "balena preload" requires Docker to be correctly installed in
your shell environment. For more information (including Windows support)
check: https://github.com/balena-io/balena-cli/blob/master/INSTALL.md

Examples:

	$ balena preload balena.img --app 1234 --commit e1f2592fc6ee949e68756d4f4a48e49bff8d72a0 --splash-image image.png
	$ balena preload balena.img\
`,
	permission: 'user',
	primary: true,
	options: preloadOptions,
	action(params, options, done) {
		let certificates;
		const Promise = require('bluebird');
		const balena = getBalenaSdk();
		const balenaPreload = require('balena-preload');
		const visuals = getVisuals();
		const nodeCleanup = require('node-cleanup');
		const { exitWithExpectedError } = require('../errors');

		const progressBars = {};

		const progressHandler = function (event) {
			let progressBar = progressBars[event.name];
			if (!progressBar) {
				progressBar = progressBars[event.name] = new visuals.Progress(
					event.name,
				);
			}
			return progressBar.update({ percentage: event.percentage });
		};

		const spinners = {};

		const spinnerHandler = function (event) {
			let spinner = spinners[event.name];
			if (!spinner) {
				spinner = spinners[event.name] = new visuals.Spinner(event.name);
			}
			if (event.action === 'start') {
				return spinner.start();
			} else {
				console.log();
				return spinner.stop();
			}
		};

		options.commit = isCurrent(options.commit) ? 'latest' : options.commit;
		options.image = params.image;
		options.appId = options.app;
		delete options.app;

		options.splashImage = options['splash-image'];
		delete options['splash-image'];

		options.dontCheckArch = options['dont-check-arch'] || false;
		delete options['dont-check-arch'];
		if (options.dontCheckArch && !options.appId) {
			exitWithExpectedError(
				'You need to specify an app id if you disable the architecture check.',
			);
		}

		options.pinDevice = options['pin-device-to-release'] || false;
		delete options['pin-device-to-release'];

		if (Array.isArray(options['add-certificate'])) {
			certificates = options['add-certificate'];
		} else if (options['add-certificate'] === undefined) {
			certificates = [];
		} else {
			certificates = [options['add-certificate']];
		}
		for (let certificate of certificates) {
			if (!certificate.endsWith('.crt')) {
				exitWithExpectedError('Certificate file name must end with ".crt"');
			}
		}

		// Get a configured dockerode instance
		return dockerUtils.getDocker(options).then(function (docker) {
			const preloader = new balenaPreload.Preloader(
				balena,
				docker,
				options.appId,
				options.commit,
				options.image,
				options.splashImage,
				options.proxy,
				options.dontCheckArch,
				options.pinDevice,
				certificates,
			);

			let gotSignal = false;

			nodeCleanup(function (_exitCode, signal) {
				if (signal) {
					gotSignal = true;
					nodeCleanup.uninstall(); // don't call cleanup handler again
					preloader.cleanup().then(() => {
						// calling process.exit() won't inform parent process of signal
						process.kill(process.pid, signal);
					});
					return false;
				}
			});

			if (process.env.DEBUG) {
				preloader.stderr.pipe(process.stderr);
			}

			preloader.on('progress', progressHandler);
			preloader.on('spinner', spinnerHandler);

			return new Promise(function (resolve, reject) {
				preloader.on('error', reject);

				return preloader
					.prepare()
					.then(() => {
						// If no appId was provided, show a list of matching apps
						if (!preloader.appId) {
							return selectApplication(
								preloader.config.deviceType,
							).then((application) => preloader.setApplication(application));
						}
					})
					.then(() => {
						// Use the commit given as --commit or show an interactive commit selection menu
						if (options.commit) {
							if (isCurrent(options.commit) && preloader.application.commit) {
								// handle `--commit current` (and its `--commit latest` synonym)
								return 'latest';
							}
							const release = _.find(preloader.application.owns__release, (r) =>
								r.commit.startsWith(options.commit),
							);
							if (!release) {
								exitWithExpectedError(
									'There is no release matching this commit',
								);
							}
							return release.commit;
						}
						return selectApplicationCommit(preloader.application.owns__release);
					})
					.then(function (commit) {
						if (isCurrent(commit)) {
							preloader.commit = preloader.application.commit;
						} else {
							preloader.commit = commit;
						}

						// Propose to disable automatic app updates if the commit is not the current release
						return offerToDisableAutomaticUpdates(
							preloader.application,
							commit,
							options.pinDevice,
						);
					})
					.then(() =>
						// All options are ready: preload the image.
						preloader.preload(),
					)
					.catch(balena.errors.BalenaError, exitWithExpectedError)
					.then(resolve)
					.catch(reject);
			})
				.then(done)
				.finally(function () {
					if (!gotSignal) {
						return preloader.cleanup();
					}
				});
		});
	},
};