/*
 * 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 Settings = require('settings-sharelatex');
const rclient_project_history = require("redis-sharelatex").createClient(Settings.redis.project_history);
const ProjectHistoryKeys = Settings.redis.project_history.key_schema;

const MockProjectHistoryApi = require("./helpers/MockProjectHistoryApi");
const MockWebApi = require("./helpers/MockWebApi");
const DocUpdaterClient = require("./helpers/DocUpdaterClient");
const DocUpdaterApp = require("./helpers/DocUpdaterApp");

describe("Applying updates to a project's structure", function() {
	before(function() {
		this.user_id = 'user-id-123';
		return this.version = 1234;
	});

	describe("renaming a file", function() {
		before(function(done) {
			this.project_id = DocUpdaterClient.randomId();
			this.fileUpdate = {
				id: DocUpdaterClient.randomId(),
				pathname: '/file-path',
				newPathname: '/new-file-path'
			};
			this.fileUpdates = [ this.fileUpdate ];
			return DocUpdaterApp.ensureRunning(error => {
				if (error != null) { throw error; }
				return DocUpdaterClient.sendProjectUpdate(this.project_id, this.user_id, [], this.fileUpdates, this.version, function(error) {
					if (error != null) { throw error; }
					return setTimeout(done, 200);
				});
			});
		});

		return it("should push the applied file renames to the project history api", function(done) {
			rclient_project_history.lrange(ProjectHistoryKeys.projectHistoryOps({project_id: this.project_id}), 0, -1, (error, updates) => {
				if (error != null) { throw error; }

				const update = JSON.parse(updates[0]);
				update.file.should.equal(this.fileUpdate.id);
				update.pathname.should.equal('/file-path');
				update.new_pathname.should.equal('/new-file-path');
				update.meta.user_id.should.equal(this.user_id);
				update.meta.ts.should.be.a('string');
				update.version.should.equal(`${this.version}.0`);

				return done();
			});
			return null;
		});
	});

	describe("renaming a document", function() {
		before(function() {
			this.docUpdate = {
				id: DocUpdaterClient.randomId(),
				pathname: '/doc-path',
				newPathname: '/new-doc-path'
			};
			return this.docUpdates = [ this.docUpdate ];});

		describe("when the document is not loaded", function() {
			before(function(done) {
				this.project_id = DocUpdaterClient.randomId();
				DocUpdaterClient.sendProjectUpdate(this.project_id, this.user_id, this.docUpdates, [], this.version, function(error) {
					if (error != null) { throw error; }
					return setTimeout(done, 200);
				});
				return null;
			});

			return it("should push the applied doc renames to the project history api", function(done) {
				rclient_project_history.lrange(ProjectHistoryKeys.projectHistoryOps({project_id: this.project_id}), 0, -1, (error, updates) => {
					if (error != null) { throw error; }

					const update = JSON.parse(updates[0]);
					update.doc.should.equal(this.docUpdate.id);
					update.pathname.should.equal('/doc-path');
					update.new_pathname.should.equal('/new-doc-path');
					update.meta.user_id.should.equal(this.user_id);
					update.meta.ts.should.be.a('string');
					update.version.should.equal(`${this.version}.0`);

					return done();
				});
				return null;
			});
		});

		return describe("when the document is loaded", function() {
			before(function(done) {
				this.project_id = DocUpdaterClient.randomId();
				MockWebApi.insertDoc(this.project_id, this.docUpdate.id, {});
				DocUpdaterClient.preloadDoc(this.project_id, this.docUpdate.id, error => {
					if (error != null) { throw error; }
					sinon.spy(MockWebApi, "getDocument");
					return DocUpdaterClient.sendProjectUpdate(this.project_id, this.user_id, this.docUpdates, [], this.version, function(error) {
						if (error != null) { throw error; }
						return setTimeout(done, 200);
					});
				});
				return null;
			});

			after(() => MockWebApi.getDocument.restore());

			it("should update the doc", function(done) {
				DocUpdaterClient.getDoc(this.project_id, this.docUpdate.id, (error, res, doc) => {
					doc.pathname.should.equal(this.docUpdate.newPathname);
					return done();
				});
				return null;
			});

			return it("should push the applied doc renames to the project history api", function(done) {
				rclient_project_history.lrange(ProjectHistoryKeys.projectHistoryOps({project_id: this.project_id}), 0, -1, (error, updates) => {
					if (error != null) { throw error; }

					const update = JSON.parse(updates[0]);
					update.doc.should.equal(this.docUpdate.id);
					update.pathname.should.equal('/doc-path');
					update.new_pathname.should.equal('/new-doc-path');
					update.meta.user_id.should.equal(this.user_id);
					update.meta.ts.should.be.a('string');
					update.version.should.equal(`${this.version}.0`);

					return done();
				});
				return null;
			});
		});
	});

	describe("renaming multiple documents and files", function() {
		before(function() {
			this.docUpdate0 = {
				id: DocUpdaterClient.randomId(),
				pathname: '/doc-path0',
				newPathname: '/new-doc-path0'
			};
			this.docUpdate1 = {
				id: DocUpdaterClient.randomId(),
				pathname: '/doc-path1',
				newPathname: '/new-doc-path1'
			};
			this.docUpdates = [ this.docUpdate0, this.docUpdate1 ];
			this.fileUpdate0 = {
				id: DocUpdaterClient.randomId(),
				pathname: '/file-path0',
				newPathname: '/new-file-path0'
			};
			this.fileUpdate1 = {
				id: DocUpdaterClient.randomId(),
				pathname: '/file-path1',
				newPathname: '/new-file-path1'
			};
			return this.fileUpdates = [ this.fileUpdate0, this.fileUpdate1 ];});

		return describe("when the documents are not loaded", function() {
			before(function(done) {
				this.project_id = DocUpdaterClient.randomId();
				DocUpdaterClient.sendProjectUpdate(this.project_id, this.user_id, this.docUpdates, this.fileUpdates, this.version, function(error) {
					if (error != null) { throw error; }
					return setTimeout(done, 200);
				});
				return null;
			});

			return it("should push the applied doc renames to the project history api", function(done) {
				rclient_project_history.lrange(ProjectHistoryKeys.projectHistoryOps({project_id: this.project_id}), 0, -1, (error, updates) => {
					if (error != null) { throw error; }

					let update = JSON.parse(updates[0]);
					update.doc.should.equal(this.docUpdate0.id);
					update.pathname.should.equal('/doc-path0');
					update.new_pathname.should.equal('/new-doc-path0');
					update.meta.user_id.should.equal(this.user_id);
					update.meta.ts.should.be.a('string');
					update.version.should.equal(`${this.version}.0`);

					update = JSON.parse(updates[1]);
					update.doc.should.equal(this.docUpdate1.id);
					update.pathname.should.equal('/doc-path1');
					update.new_pathname.should.equal('/new-doc-path1');
					update.meta.user_id.should.equal(this.user_id);
					update.meta.ts.should.be.a('string');
					update.version.should.equal(`${this.version}.1`);

					update = JSON.parse(updates[2]);
					update.file.should.equal(this.fileUpdate0.id);
					update.pathname.should.equal('/file-path0');
					update.new_pathname.should.equal('/new-file-path0');
					update.meta.user_id.should.equal(this.user_id);
					update.meta.ts.should.be.a('string');
					update.version.should.equal(`${this.version}.2`);

					update = JSON.parse(updates[3]);
					update.file.should.equal(this.fileUpdate1.id);
					update.pathname.should.equal('/file-path1');
					update.new_pathname.should.equal('/new-file-path1');
					update.meta.user_id.should.equal(this.user_id);
					update.meta.ts.should.be.a('string');
					update.version.should.equal(`${this.version}.3`);

					return done();
				});
				return null;
			});
		});
	});


	describe("adding a file", function() {
		before(function(done) {
			this.project_id = DocUpdaterClient.randomId();
			this.fileUpdate = {
				id: DocUpdaterClient.randomId(),
				pathname: '/file-path',
				url: 'filestore.example.com'
			};
			this.fileUpdates = [ this.fileUpdate ];
			DocUpdaterClient.sendProjectUpdate(this.project_id, this.user_id, [], this.fileUpdates, this.version, function(error) {
				if (error != null) { throw error; }
				return setTimeout(done, 200);
			});
			return null;
		});

		return it("should push the file addition to the project history api", function(done) {
			rclient_project_history.lrange(ProjectHistoryKeys.projectHistoryOps({project_id: this.project_id}), 0, -1, (error, updates) => {
				if (error != null) { throw error; }

				const update = JSON.parse(updates[0]);
				update.file.should.equal(this.fileUpdate.id);
				update.pathname.should.equal('/file-path');
				update.url.should.equal('filestore.example.com');
				update.meta.user_id.should.equal(this.user_id);
				update.meta.ts.should.be.a('string');
				update.version.should.equal(`${this.version}.0`);

				return done();
			});
			return null;
		});
	});

	describe("adding a doc", function() {
		before(function(done) {
			this.project_id = DocUpdaterClient.randomId();
			this.docUpdate = {
				id: DocUpdaterClient.randomId(),
				pathname: '/file-path',
				docLines: 'a\nb'
			};
			this.docUpdates = [ this.docUpdate ];
			DocUpdaterClient.sendProjectUpdate(this.project_id, this.user_id, this.docUpdates, [], this.version, function(error) {
				if (error != null) { throw error; }
				return setTimeout(done, 200);
			});
			return null;
		});

		return it("should push the doc addition to the project history api", function(done) {
			rclient_project_history.lrange(ProjectHistoryKeys.projectHistoryOps({project_id: this.project_id}), 0, -1, (error, updates) => {
				if (error != null) { throw error; }

				const update = JSON.parse(updates[0]);
				update.doc.should.equal(this.docUpdate.id);
				update.pathname.should.equal('/file-path');
				update.docLines.should.equal('a\nb');
				update.meta.user_id.should.equal(this.user_id);
				update.meta.ts.should.be.a('string');
				update.version.should.equal(`${this.version}.0`);

				return done();
			});
			return null;
		});
	});

	describe("with enough updates to flush to the history service", function() {
		before(function(done) {
			this.project_id = DocUpdaterClient.randomId();
			this.user_id = DocUpdaterClient.randomId();
			this.version0 = 12345;
			this.version1 = this.version0 + 1;
			const updates = [];
			for (let v = 0; v <= 599; v++) { // Should flush after 500 ops
				updates.push({
					id: DocUpdaterClient.randomId(),
					pathname: '/file-' + v,
					docLines: 'a\nb'
				});
			}

			sinon.spy(MockProjectHistoryApi, "flushProject");

			// Send updates in chunks to causes multiple flushes
			const projectId = this.project_id;
			const userId = this.project_id;
			DocUpdaterClient.sendProjectUpdate(projectId, userId, updates.slice(0, 250), [], this.version0, function(error) {
				if (error != null) { throw error; }
				return DocUpdaterClient.sendProjectUpdate(projectId, userId, updates.slice(250), [], this.version1, function(error) {
					if (error != null) { throw error; }
					return setTimeout(done, 2000);
				});
			});
			return null;
		});

		after(() => MockProjectHistoryApi.flushProject.restore());

		return it("should flush project history", function() {
			return MockProjectHistoryApi.flushProject.calledWith(this.project_id).should.equal(true);
		});
	});

	return describe("with too few updates to flush to the history service", function() {
		before(function(done) {
			this.project_id = DocUpdaterClient.randomId();
			this.user_id = DocUpdaterClient.randomId();
			this.version0 = 12345;
			this.version1 = this.version0 + 1;

			const updates = [];
			for (let v = 0; v <= 42; v++) { // Should flush after 500 ops
				updates.push({
					id: DocUpdaterClient.randomId(),
					pathname: '/file-' + v,
					docLines: 'a\nb'
				});
			}

			sinon.spy(MockProjectHistoryApi, "flushProject");

			// Send updates in chunks
			const projectId = this.project_id;
			const userId = this.project_id;
			DocUpdaterClient.sendProjectUpdate(projectId, userId, updates.slice(0, 10), [], this.version0, function(error) {
				if (error != null) { throw error; }
				return DocUpdaterClient.sendProjectUpdate(projectId, userId, updates.slice(10), [], this.version1, function(error) {
					if (error != null) { throw error; }
					return setTimeout(done, 2000);
				});
			});
			return null;
		});

		after(() => MockProjectHistoryApi.flushProject.restore());

		return it("should not flush project history", function() {
			return MockProjectHistoryApi.flushProject.calledWith(this.project_id).should.equal(false);
		});
	});
});