/*
 * decaffeinate suggestions:
 * 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
 */
const sinon = require("sinon");
const chai = require("chai");
chai.should();
const { expect } = chai;
const mongojs = require("../../../app/js/mongojs");
const { db } = mongojs;
const { ObjectId } = mongojs;
const Settings = require("settings-sharelatex");

const TrackChangesApp = require("./helpers/TrackChangesApp");
const TrackChangesClient = require("./helpers/TrackChangesClient");
const MockDocUpdaterApi = require("./helpers/MockDocUpdaterApi");
const MockWebApi = require("./helpers/MockWebApi");

describe("Getting a diff", function() {

	beforeEach(function(done) {
		sinon.spy(MockDocUpdaterApi, "getDoc");

		this.now = Date.now();
		this.from = this.now - 100000000;
		this.to = this.now;
		this.user_id = ObjectId().toString();
		this.doc_id = ObjectId().toString();
		this.project_id = ObjectId().toString();
		MockWebApi.projects[this.project_id] = {features: {versioning: true}};

		MockWebApi.users[this.user_id] = (this.user = {
			email: "user@sharelatex.com",
			first_name: "Leo",
			last_name: "Lion",
			id: this.user_id
		});
		sinon.spy(MockWebApi, "getUserInfo");

		const twoMinutes = 2 * 60 * 1000;

		this.updates = [{
			op: [{ i: "one ", p: 0 }],
			meta: { ts: this.from - twoMinutes, user_id: this.user_id },
			v: 3
		}, {
			op: [{ i: "two ", p: 4 }],
			meta: { ts: this.from + twoMinutes, user_id: this.user_id },
			v: (this.fromVersion = 4)
		}, {
			op: [{ i: "three ", p: 8 }],
			meta: { ts: this.to - twoMinutes, user_id: this.user_id },
			v: (this.toVersion = 5)
		}, {
			op: [{ i: "four", p: 14 }],
			meta: { ts: this.to + twoMinutes, user_id: this.user_id },
			v: 6
		}];
		this.lines = ["one two three four"];
		this.expected_diff = [
			{ u: "one " },
			{ i: "two three ", meta: { start_ts: this.from + twoMinutes, end_ts: this.to - twoMinutes, user: this.user } }
		];

		MockDocUpdaterApi.docs[this.doc_id] = {
			lines: this.lines,
			version: 7
		};
		TrackChangesApp.ensureRunning(() => {
			return TrackChangesClient.pushRawUpdates(this.project_id, this.doc_id, this.updates, error => {
				if (error != null) { throw error; }
				return TrackChangesClient.getDiff(this.project_id, this.doc_id, this.fromVersion, this.toVersion, (error, diff) => {
					if (error != null) { throw error; }
					this.diff = diff.diff;
					return done();
				});
			});
		});
		return null;
	});

	afterEach(function() {
		MockDocUpdaterApi.getDoc.restore();
		MockWebApi.getUserInfo.restore();
		return null;
	});

	it("should return the diff", function() {
		return expect(this.diff).to.deep.equal(this.expected_diff);
	});

	return it("should get the doc from the doc updater", function() {
		MockDocUpdaterApi.getDoc
			.calledWith(this.project_id, this.doc_id)
			.should.equal(true);
		return null;
	});
});