import XCTest
import SwiftyJSON

class TestingConstants {
    static let userJsonExample = "{\"username\": \"testusername\",\"name\" : \"juan\", \"lastname\" : \"perez\", \"email\" : \"email@address.com\", \"birthDate\" : \"01-01-1980\"}"
}

class LoginViewMock {

}

class LoginServiceMock : LoginService{

    var didCallGetUserList = false

    override func login(username : String, password : String, completion: @escaping (User?,Error?) -> Void) {
        // Given
        let jsonString = TestingConstants.userJsonExample
        let jsonData = jsonString.data(using: .utf8)!
        let jsonResponse = try! JSON.init(data: jsonData)
        let user = User.init(json: jsonResponse)

        // Verify
        XCTAssert(user.username == "testusername")
        XCTAssert(user.name == "juan")
        XCTAssert(user.lastname == "perez")
        XCTAssert(user.email == "email@address.com")
        completion(user,nil)
    }


    override func getUserList(token : String, completion: @escaping (UserFeed?,Error?) -> Void) {
        didCallGetUserList = true
    }
}



class LoginTests: XCTestCase {

    var loginService : LoginServiceMock?
    var loginPresenter : LoginPresenter?

    override func setUp() {
        super.setUp()
        loginService = LoginServiceMock()
        loginPresenter = LoginPresenter.init(loginService:loginService!)
    }

    override func tearDown() {
        super.tearDown()
    }


    func testLoginFlow() {
        // Given
        let username =  "testusername"
        let password = "123456"
        let expectation = self.expectation(description: "loginUser")

        // When
        loginPresenter?.loginUserSaveSessionAndGetUserList(username:username, password: password, completion: { (error) in
            expectation.fulfill()
        })

        waitForExpectations(timeout: 15, handler: nil)

        // Verify
        XCTAssert(loginService?.didCallGetUserList == true, "getUserList should have been called")
    }



}