import XCTest
@testable import StudyCK

class StudyCKTests: XCTestCase {
	
	var loginModel: LoginViewModel! = nil
    override func setUp() {
        super.setUp()
		loginModel = LoginViewModel()
    }
    
    override func tearDown() {
        // Put teardown code here. This method is called after the invocation of each test method in the class.
		loginModel = nil
        super.tearDown()
    }
	
	func testStartLogin() {
		let startExpectation = expectation(description: "login state changed to true")
		let endExpectation = expectation(description: "login state changed to false")
		loginModel.loginStateChanged = {(state: Bool) in
			if state {
				startExpectation.fulfill()
			} else {
				endExpectation.fulfill()
			}
		}
		loginModel.login()
		wait(for: [startExpectation, endExpectation], timeout: 10.0)
	}
    
    func testNoUsernameLogin() {
		loginModel.password = "aa"
		let expectation = XCTestExpectation(description: "no username")
		loginModel.showLoginFailedAlert = {(title: String, message: String) in
			if title == "錯誤" && message == "帳號不存在" {
				expectation.fulfill()
			}
		}
		loginModel.login()
		wait(for: [expectation], timeout: 10.0)
    }
	
	func testNoPasswordLogin() {
		loginModel.username = "ck1060535"
		let expectation = XCTestExpectation(description: "no password")
		loginModel.showLoginFailedAlert = {(title: String, message: String) in
			if title == "錯誤" && message.contains("密碼錯誤") {
				expectation.fulfill()
			}
		}
		loginModel.login()
		wait(for: [expectation], timeout: 10.0)
	}
	
	func testWrongPasswordLogin() {
		loginModel.username = "ck1060535"
		loginModel.password = "aa"
		let expectation = XCTestExpectation(description: "wrong password")
		loginModel.showLoginFailedAlert = {(title: String, message: String) in
			if title == "錯誤" && message.contains("密碼錯誤") {
				expectation.fulfill()
			}
		}
		loginModel.login()
		wait(for: [expectation], timeout: 10.0)
	}
	
	func testSuccessfulLogin() {
		loginModel.username = "tUsername"
		loginModel.password = "tPassword"
		let expectation = XCTestExpectation(description: "login successful")
		loginModel.loginSuccessfully = {
			expectation.fulfill()
		}
		loginModel.login()
		wait(for: [expectation], timeout: 10.0)
	}
    
}