/* eslint-disable
    camelcase,
    handle-callback-err,
    no-unused-vars,
*/
// TODO: This file was created by bulk-decaffeinate.
// Fix any style issues and re-enable lint.
/*
 * decaffeinate suggestions:
 * DS101: Remove unnecessary use of Array.from
 * DS102: Remove unnecessary code created because of implicit returns
 * DS207: Consider shorter variations of null checks
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
let TrackChangesClient;
const async = require('async');
const zlib = require('zlib');
const request = require("request");
const Settings = require("settings-sharelatex");
const rclient = require("redis-sharelatex").createClient(Settings.redis.history); // Only works locally for now
const Keys = Settings.redis.history.key_schema;
const {db, ObjectId} = require("../../../../app/js/mongojs");

const aws = require("aws-sdk");
const s3 = new aws.S3({
	accessKeyId: Settings.trackchanges.s3.key,
	secretAccessKey: Settings.trackchanges.s3.secret,
	endpoint: Settings.trackchanges.s3.endpoint,
	s3ForcePathStyle: Settings.trackchanges.s3.pathStyle
});
const S3_BUCKET = Settings.trackchanges.stores.doc_history;

module.exports = (TrackChangesClient = {
	flushAndGetCompressedUpdates(project_id, doc_id, callback) {
		if (callback == null) { callback = function(error, updates) {}; }
		return TrackChangesClient.flushDoc(project_id, doc_id, (error) => {
			if (error != null) { return callback(error); }
			return TrackChangesClient.getCompressedUpdates(doc_id, callback);
		});
	},

	flushDoc(project_id, doc_id, callback) {
		if (callback == null) { callback = function(error) {}; }
		return request.post({
			url: `http://localhost:3015/project/${project_id}/doc/${doc_id}/flush`
		}, (error, response, body) => {
			response.statusCode.should.equal(204);
			return callback(error);
		});
	},

	flushProject(project_id, callback) {
		if (callback == null) { callback = function(error) {}; }
		return request.post({
			url: `http://localhost:3015/project/${project_id}/flush`
		}, (error, response, body) => {
			response.statusCode.should.equal(204);
			return callback(error);
		});
	},

	getCompressedUpdates(doc_id, callback) {
		if (callback == null) { callback = function(error, updates) {}; }
		return db.docHistory
			.find({doc_id: ObjectId(doc_id)})
			.sort({"meta.end_ts": 1})
			.toArray(callback);
	},

	getProjectMetaData(project_id, callback) {
		if (callback == null) { callback = function(error, updates) {}; }
		return db.projectHistoryMetaData
			.find({
				project_id: ObjectId(project_id)
			},
			(error, projects) => callback(error, projects[0]));
	},

	setPreserveHistoryForProject(project_id, callback) {
		if (callback == null) { callback = function(error) {}; }
		return db.projectHistoryMetaData.update({
			project_id: ObjectId(project_id)
			}, {
				$set: { preserveHistory: true }
			}, {
				upsert: true
			}, callback);
	},

	pushRawUpdates(project_id, doc_id, updates, callback) {
		if (callback == null) { callback = function(error) {}; }
		return rclient.sadd(Keys.docsWithHistoryOps({project_id}), doc_id, (error) => {
			if (error != null) { return callback(error); }
			return rclient.rpush(Keys.uncompressedHistoryOps({doc_id}), ...Array.from(((Array.from(updates).map((u) => JSON.stringify(u))))), callback);
		});
	},

	getDiff(project_id, doc_id, from, to, callback) {
		if (callback == null) { callback = function(error, diff) {}; }
		return request.get({
			url: `http://localhost:3015/project/${project_id}/doc/${doc_id}/diff?from=${from}&to=${to}`
		}, (error, response, body) => {
			response.statusCode.should.equal(200);
			return callback(null, JSON.parse(body));
		});
	},

	getUpdates(project_id, options, callback) {
		if (callback == null) { callback = function(error, body) {}; }
		return request.get({
			url: `http://localhost:3015/project/${project_id}/updates?before=${options.before}&min_count=${options.min_count}`
		}, (error, response, body) => {
			response.statusCode.should.equal(200);
			return callback(null, JSON.parse(body));
		});
	},

	restoreDoc(project_id, doc_id, version, user_id, callback) {
		if (callback == null) { callback = function(error) {}; }
		return request.post({
			url: `http://localhost:3015/project/${project_id}/doc/${doc_id}/version/${version}/restore`,
			headers: {
				"X-User-Id": user_id
			}
		}, (error, response, body) => {
			response.statusCode.should.equal(204);
			return callback(null);
		});
	},

	pushDocHistory(project_id, doc_id, callback) {
		if (callback == null) { callback = function(error) {}; }
		return request.post({
			url: `http://localhost:3015/project/${project_id}/doc/${doc_id}/push`
		}, (error, response, body) => {
			response.statusCode.should.equal(204);
			return callback(error);
		});
	},

	pullDocHistory(project_id, doc_id, callback) {
		if (callback == null) { callback = function(error) {}; }
		return request.post({
			url: `http://localhost:3015/project/${project_id}/doc/${doc_id}/pull`
		}, (error, response, body) => {
			response.statusCode.should.equal(204);
			return callback(error);
		});
	},

	waitForS3(done, retries) {
		if (retries == null) { retries = 42; }
		if (!Settings.trackchanges.s3.endpoint) {
			return done();
		}

		return request.get(`${Settings.trackchanges.s3.endpoint}/`, (err, res) => {
			if (res && (res.statusCode < 500)) {
				return done();
			}

			if (retries === 0) {
				return done(err || new Error(`s3 returned ${res.statusCode}`));
			}

			return setTimeout(() => TrackChangesClient.waitForS3(done, --retries)
			, 1000);
		});
	},

	getS3Doc(project_id, doc_id, pack_id, callback) {
		if (callback == null) { callback = function(error, body) {}; }
		const params = {
			Bucket: S3_BUCKET,
			Key: `${project_id}/changes-${doc_id}/pack-${pack_id}`
		};

		return s3.getObject(params, (error, data) => {
			if (error != null) { return callback(error); }
			const body = data.Body;
			if ((body == null)) { return callback(new Error("empty response from s3")); }
			return zlib.gunzip(body, (err, result) => {
				if (err != null) { return callback(err); }
				return callback(null, JSON.parse(result.toString()));
			});
		});
	},

	removeS3Doc(project_id, doc_id, callback) {
		if (callback == null) { callback = function(error, res, body) {}; }
		let params = {
			Bucket: S3_BUCKET,
			Prefix: `${project_id}/changes-${doc_id}`
		};

		return s3.listObjects(params, (error, data) => {
			if (error != null) { return callback(error); }

			params = {
				Bucket: S3_BUCKET,
				Delete: {
					Objects: data.Contents.map(s3object => ({Key: s3object.Key}))
				}
			};

			return s3.deleteObjects(params, callback);
		});
	}
});