/*
 * decaffeinate suggestions:
 * DS102: Remove unnecessary code created because of implicit returns
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
const SandboxedModule = require('sandboxed-module');
const sinon = require('sinon');
require('chai').should();
const modulePath = require('path').join(__dirname, '../../../../app/js/HistoryManager');

describe("HistoryManager", function() {
	beforeEach(function() {
		this.HistoryManager = SandboxedModule.require(modulePath, { requires: {
			"request": (this.request = {}),
			"settings-sharelatex": (this.Settings = {
				apis: {
					project_history: {
						enabled: true,
						url: "http://project_history.example.com"
					},
					trackchanges: {
						url: "http://trackchanges.example.com"
					}
				}
			}),
			"logger-sharelatex": (this.logger = { log: sinon.stub(), error: sinon.stub(), debug: sinon.stub() }),
			"./DocumentManager": (this.DocumentManager = {}),
			"./HistoryRedisManager": (this.HistoryRedisManager = {}),
			"./RedisManager": (this.RedisManager = {}),
			"./ProjectHistoryRedisManager": (this.ProjectHistoryRedisManager = {}),
			"./Metrics": (this.metrics = {inc: sinon.stub()})
		}
	});
		this.project_id = "mock-project-id";
		this.doc_id = "mock-doc-id";
		return this.callback = sinon.stub();
	});

	describe("flushDocChangesAsync", function() {
		beforeEach(function() {
			return this.request.post = sinon.stub().callsArgWith(1, null, {statusCode: 204});
		});

		describe("when the project uses track changes", function() {
			beforeEach(function() {
				this.RedisManager.getHistoryType = sinon.stub().yields(null, 'track-changes');
				return this.HistoryManager.flushDocChangesAsync(this.project_id, this.doc_id);
			});

			return it("should send a request to the track changes api", function() {
				return this.request.post
					.calledWith(`${this.Settings.apis.trackchanges.url}/project/${this.project_id}/doc/${this.doc_id}/flush`)
					.should.equal(true);
			});
		});

		describe("when the project uses project history and double flush is not disabled", function() {
			beforeEach(function() {
				this.RedisManager.getHistoryType = sinon.stub().yields(null, 'project-history');
				return this.HistoryManager.flushDocChangesAsync(this.project_id, this.doc_id);
			});

			return it("should send a request to the track changes api", function() {
				return this.request.post
					.called
					.should.equal(true);
			});
		});

		return describe("when the project uses project history and double flush is disabled", function() {
			beforeEach(function() {
				this.Settings.disableDoubleFlush = true;
				this.RedisManager.getHistoryType = sinon.stub().yields(null, 'project-history');
				return this.HistoryManager.flushDocChangesAsync(this.project_id, this.doc_id);
			});

			return it("should not send a request to the track changes api", function() {
				return this.request.post
					.called
					.should.equal(false);
			});
		});
	});


	describe("flushProjectChangesAsync", function() {
		beforeEach(function() {
			this.request.post = sinon.stub().callsArgWith(1, null, {statusCode: 204});

			return this.HistoryManager.flushProjectChangesAsync(this.project_id);
		});

		return it("should send a request to the project history api", function() {
			return this.request.post
				.calledWith({url: `${this.Settings.apis.project_history.url}/project/${this.project_id}/flush`, qs:{background:true}})
				.should.equal(true);
		});
	});

	describe("flushProjectChanges", function() {

		describe("in the normal case", function() {
			beforeEach(function() {
				this.request.post = sinon.stub().callsArgWith(1, null, {statusCode: 204});
				return this.HistoryManager.flushProjectChanges(this.project_id, {background:true});});

			return it("should send a request to the project history api", function() {
				return this.request.post
					.calledWith({url: `${this.Settings.apis.project_history.url}/project/${this.project_id}/flush`, qs:{background:true}})
					.should.equal(true);
			});
		});

		return describe("with the skip_history_flush option", function() {
			beforeEach(function() {
				this.request.post = sinon.stub();
				return this.HistoryManager.flushProjectChanges(this.project_id, {skip_history_flush:true});});

			return it("should not send a request to the project history api", function() {
				return this.request.post
					.called
					.should.equal(false);
			});
		});
	});

	describe("recordAndFlushHistoryOps", function() {
		beforeEach(function() {
			this.ops = [ 'mock-ops' ];
			this.project_ops_length = 10;
			this.doc_ops_length = 5;

			this.HistoryManager.flushProjectChangesAsync = sinon.stub();
			this.HistoryRedisManager.recordDocHasHistoryOps = sinon.stub().callsArg(3);
			return this.HistoryManager.flushDocChangesAsync = sinon.stub();
		});

		describe("with no ops", function() {
			beforeEach(function() {
				return this.HistoryManager.recordAndFlushHistoryOps(
					this.project_id, this.doc_id, [], this.doc_ops_length, this.project_ops_length, this.callback
				);
			});

			it("should not flush project changes", function() {
				return this.HistoryManager.flushProjectChangesAsync.called.should.equal(false);
			});

			it("should not record doc has history ops", function() {
				return this.HistoryRedisManager.recordDocHasHistoryOps.called.should.equal(false);
			});

			it("should not flush doc changes", function() {
				return this.HistoryManager.flushDocChangesAsync.called.should.equal(false);
			});

			return it("should call the callback", function() {
				return this.callback.called.should.equal(true);
			});
		});

		describe("with enough ops to flush project changes", function() {
			beforeEach(function() {
				this.HistoryManager.shouldFlushHistoryOps = sinon.stub();
				this.HistoryManager.shouldFlushHistoryOps.withArgs(this.project_ops_length).returns(true);
				this.HistoryManager.shouldFlushHistoryOps.withArgs(this.doc_ops_length).returns(false);

				return this.HistoryManager.recordAndFlushHistoryOps(
					this.project_id, this.doc_id, this.ops, this.doc_ops_length, this.project_ops_length, this.callback
				);
			});

			it("should flush project changes", function() {
				return this.HistoryManager.flushProjectChangesAsync
					.calledWith(this.project_id)
					.should.equal(true);
			});

			it("should record doc has history ops", function() {
				return this.HistoryRedisManager.recordDocHasHistoryOps
					.calledWith(this.project_id, this.doc_id, this.ops);
			});

			it("should not flush doc changes", function() {
				return this.HistoryManager.flushDocChangesAsync.called.should.equal(false);
			});

			return it("should call the callback", function() {
				return this.callback.called.should.equal(true);
			});
		});

		describe("with enough ops to flush doc changes", function() {
			beforeEach(function() {
				this.HistoryManager.shouldFlushHistoryOps = sinon.stub();
				this.HistoryManager.shouldFlushHistoryOps.withArgs(this.project_ops_length).returns(false);
				this.HistoryManager.shouldFlushHistoryOps.withArgs(this.doc_ops_length).returns(true);

				return this.HistoryManager.recordAndFlushHistoryOps(
					this.project_id, this.doc_id, this.ops, this.doc_ops_length, this.project_ops_length, this.callback
				);
			});

			it("should not flush project changes", function() {
				return this.HistoryManager.flushProjectChangesAsync.called.should.equal(false);
			});

			it("should record doc has history ops", function() {
				return this.HistoryRedisManager.recordDocHasHistoryOps
					.calledWith(this.project_id, this.doc_id, this.ops);
			});

			it("should flush doc changes", function() {
				return this.HistoryManager.flushDocChangesAsync
					.calledWith(this.project_id, this.doc_id)
					.should.equal(true);
			});

			return it("should call the callback", function() {
				return this.callback.called.should.equal(true);
			});
		});

		describe("when recording doc has history ops errors", function() {
			beforeEach(function() {
				this.error = new Error("error");
				this.HistoryRedisManager.recordDocHasHistoryOps =
					sinon.stub().callsArgWith(3, this.error);

				return this.HistoryManager.recordAndFlushHistoryOps(
					this.project_id, this.doc_id, this.ops, this.doc_ops_length, this.project_ops_length, this.callback
				);
			});

			it("should not flush doc changes", function() {
				return this.HistoryManager.flushDocChangesAsync.called.should.equal(false);
			});

			return it("should call the callback with the error", function() {
				return this.callback.calledWith(this.error).should.equal(true);
			});
		});

		return describe("shouldFlushHistoryOps", function() {
			it("should return false if the number of ops is not known", function() {
				return this.HistoryManager.shouldFlushHistoryOps(null, ['a', 'b', 'c'].length, 1).should.equal(false);
			});

			it("should return false if the updates didn't take us past the threshold", function() {
				// Currently there are 14 ops
				// Previously we were on 11 ops
				// We didn't pass over a multiple of 5
				this.HistoryManager.shouldFlushHistoryOps(14, ['a', 'b', 'c'].length, 5).should.equal(false);

		  it("should return true if the updates took to the threshold", function() {});
				// Currently there are 15 ops
				// Previously we were on 12 ops
				// We've reached a new multiple of 5
				return this.HistoryManager.shouldFlushHistoryOps(15, ['a', 'b', 'c'].length, 5).should.equal(true);
			});

			return it("should return true if the updates took past the threshold", function() {
				// Currently there are 19 ops
				// Previously we were on 16 ops
				// We didn't pass over a multiple of 5
				return this.HistoryManager.shouldFlushHistoryOps(17, ['a', 'b', 'c'].length, 5).should.equal(true);
			});
		});
	});

	return describe("resyncProjectHistory", function() {
		beforeEach(function() {
			this.projectHistoryId = 'history-id-1234';
			this.docs = [{
				doc: this.doc_id,
				path: 'main.tex'
			}
			];
			this.files = [{
				file: 'mock-file-id',
				path: 'universe.png',
				url: `www.filestore.test/${this.project_id}/mock-file-id`
			}
			];
			this.ProjectHistoryRedisManager.queueResyncProjectStructure = sinon.stub().yields();
			this.DocumentManager.resyncDocContentsWithLock = sinon.stub().yields();
			return this.HistoryManager.resyncProjectHistory(this.project_id, this.projectHistoryId, this.docs, this.files, this.callback);
		});

		it("should queue a project structure reync", function() {
			return this.ProjectHistoryRedisManager.queueResyncProjectStructure
				.calledWith(this.project_id, this.projectHistoryId, this.docs, this.files)
				.should.equal(true);
		});

		it("should queue doc content reyncs", function() {
			return this.DocumentManager
				.resyncDocContentsWithLock
				.calledWith(this.project_id, this.doc_id)
				.should.equal(true);
		});

		return it("should call the callback", function() {
			return this.callback.called.should.equal(true);
		});
	});
});