import XCTest

/// Comprehensive tests for authentication flows
final class AuthenticationUITests: BaseUITest {

    // MARK: - Login Tests

    func testLoginWithValidCredentials() {
        // Given: User is on login screen
        XCTAssertTrue(app.staticTexts["MyCrib"].exists)

        // When: User enters valid credentials and taps login
        login(username: "testuser", password: "TestPass123!")

        // Then: User should be navigated to main screen
        let residencesTab = app.tabBars.buttons["Residences"]
        XCTAssertTrue(residencesTab.waitForExistence(timeout: 10), "Should navigate to main tab view")
    }

    func testLoginWithInvalidCredentials() {
        // Given: User is on login screen
        XCTAssertTrue(app.staticTexts["MyCrib"].exists)

        // When: User enters invalid credentials
        login(username: "invaliduser", password: "WrongPassword!")

        // Then: Error message should be displayed
        let errorMessage = app.staticTexts.containing(NSPredicate(format: "label CONTAINS[c] 'Invalid username or password'"))
        XCTAssertTrue(errorMessage.firstMatch.waitForExistence(timeout: 5), "Should show error message")

        // And: User should remain on login screen
        XCTAssertTrue(app.staticTexts["MyCrib"].exists)
    }

    func testLoginWithEmptyFields() {
        // Given: User is on login screen
        let loginButton = app.buttons["Login"]

        // When: User taps login without entering credentials
        loginButton.tap()

        // Then: Validation error should be shown
        let usernameError = app.staticTexts.containing(NSPredicate(format: "label CONTAINS[c] 'Username is required'"))
        XCTAssertTrue(usernameError.firstMatch.waitForExistence(timeout: 3), "Should show username required error")
    }

    func testPasswordVisibilityToggle() {
        // Given: User has typed password
        let passwordField = app.secureTextFields["Password"]
        let textField = app.textFields["Password"]
        let toggleButton = app.buttons.matching(identifier: "eye").firstMatch

        passwordField.tap()
        passwordField.typeText("TestPassword")

        // When: User taps the visibility toggle
        toggleButton.tap()

        // Then: Password should be visible as text
        XCTAssertTrue(textField.exists, "Password should be visible")

        // When: User taps toggle again
        toggleButton.tap()

        // Then: Password should be hidden again
        XCTAssertTrue(passwordField.exists, "Password should be secure")
    }

    // MARK: - Registration Tests

    func testRegistrationWithValidData() {
        // Given: User is on login screen
        let signUpButton = app.buttons["Sign Up"]

        // When: User taps Sign Up
        signUpButton.tap()

        // Then: Registration screen should be displayed
        assertNavigatedTo(title: "Create Account", timeout: 3)

        // When: User fills in valid registration data
        let timestamp = Int(Date().timeIntervalSince1970)
        register(
            username: "newuser\(timestamp)",
            email: "newuser\(timestamp)@test.com",
            password: "TestPass123!",
            firstName: "Test",
            lastName: "User"
        )

        // Then: User should be registered and shown verification screen
        let verificationTitle = app.staticTexts.containing(NSPredicate(format: "label CONTAINS[c] 'Verify'"))
        XCTAssertTrue(verificationTitle.firstMatch.waitForExistence(timeout: 10), "Should show verification screen")
    }

    func testRegistrationWithExistingUsername() {
        // Given: User is on registration screen
        let signUpButton = app.buttons["Sign Up"]
        signUpButton.tap()

        // When: User registers with existing username
        register(
            username: "existinguser",
            email: "newemail@test.com",
            password: "TestPass123!"
        )

        // Then: Error message should be displayed
        let errorMessage = app.staticTexts.containing(NSPredicate(format: "label CONTAINS[c] 'username' OR label CONTAINS[c] 'already exists'"))
        XCTAssertTrue(errorMessage.firstMatch.waitForExistence(timeout: 5), "Should show username exists error")
    }

    func testRegistrationWithInvalidEmail() {
        // Given: User is on registration screen
        let signUpButton = app.buttons["Sign Up"]
        signUpButton.tap()

        // When: User enters invalid email
        let emailField = app.textFields["Email"]
        let registerButton = app.buttons["Register"]

        emailField.tap()
        emailField.typeText("invalidemail")

        registerButton.tap()

        // Then: Email validation error should be shown
        let errorMessage = app.staticTexts.containing(NSPredicate(format: "label CONTAINS[c] 'valid email'"))
        XCTAssertTrue(errorMessage.firstMatch.waitForExistence(timeout: 3), "Should show email validation error")
    }

    func testRegistrationWithWeakPassword() {
        // Given: User is on registration screen
        let signUpButton = app.buttons["Sign Up"]
        signUpButton.tap()

        // When: User enters weak password
        let timestamp = Int(Date().timeIntervalSince1970)
        let usernameField = app.textFields["Username"]
        let emailField = app.textFields["Email"]
        let passwordField = app.secureTextFields["Password"]
        let registerButton = app.buttons["Register"]

        usernameField.tap()
        usernameField.typeText("testuser\(timestamp)")

        emailField.tap()
        emailField.typeText("test\(timestamp)@test.com")

        passwordField.tap()
        passwordField.typeText("weak")

        registerButton.tap()

        // Then: Password validation error should be shown
        let errorMessage = app.staticTexts.containing(NSPredicate(format: "label CONTAINS[c] 'password' AND (label CONTAINS[c] 'strong' OR label CONTAINS[c] 'at least')"))
        XCTAssertTrue(errorMessage.firstMatch.waitForExistence(timeout: 3), "Should show password strength error")
    }

    // MARK: - Logout Tests

    func testLogoutFlow() {
        // Given: User is logged in
        login(username: "testuser", password: "TestPass123!")

        let residencesTab = app.tabBars.buttons["Residences"]
        XCTAssertTrue(residencesTab.waitForExistence(timeout: 10))

        // When: User logs out
        logout()

        // Then: User should be returned to login screen
        XCTAssertTrue(app.staticTexts["MyCrib"].waitForExistence(timeout: 5), "Should return to login screen")
        XCTAssertTrue(app.buttons["Login"].exists, "Login button should be visible")
    }

    func testLogoutClearsUserData() {
        // Given: User is logged in and has viewed some data
        login(username: "testuser", password: "TestPass123!")

        let residencesTab = app.tabBars.buttons["Residences"]
        XCTAssertTrue(residencesTab.waitForExistence(timeout: 10))

        navigateToTab("Residences")
        wait(seconds: 2) // Wait for data to load

        // When: User logs out
        logout()

        // And: User logs back in
        login(username: "testuser", password: "TestPass123!")

        // Then: Fresh data should be loaded (not cached)
        let loadingIndicator = app.activityIndicators.firstMatch
        XCTAssertTrue(loadingIndicator.exists || app.staticTexts.containing(NSPredicate(format: "label CONTAINS[c] 'Loading'")).firstMatch.exists,
                      "Should show loading state for fresh data")
    }

    // MARK: - Session Management Tests

    func testSessionPersistence() {
        // Given: User logs in
        login(username: "testuser", password: "TestPass123!")

        let residencesTab = app.tabBars.buttons["Residences"]
        XCTAssertTrue(residencesTab.waitForExistence(timeout: 10))

        // When: App is terminated and relaunched
        app.terminate()
        app.launch()

        // Then: User should still be logged in
        XCTAssertTrue(residencesTab.waitForExistence(timeout: 5), "User session should persist")
    }

    func testLoginRedirectsVerifiedUser() {
        // Given: Verified user logs in
        login(username: "verifieduser", password: "TestPass123!")

        // Then: User should go directly to main screen (not verification)
        let residencesTab = app.tabBars.buttons["Residences"]
        XCTAssertTrue(residencesTab.waitForExistence(timeout: 10), "Verified user should skip verification")
    }

    func testLoginRedirectsUnverifiedUser() {
        // Given: Unverified user logs in
        login(username: "unverifieduser", password: "TestPass123!")

        // Then: User should be shown verification screen
        let verificationTitle = app.staticTexts.containing(NSPredicate(format: "label CONTAINS[c] 'Verify'"))
        XCTAssertTrue(verificationTitle.firstMatch.waitForExistence(timeout: 10), "Unverified user should see verification screen")
    }

    // MARK: - Error Handling Tests

    func testLoginWithNetworkError() {
        // Note: This test requires network simulation or mocking
        // For now, it's a placeholder for future implementation

        // Given: Network is unavailable
        // When: User attempts to login
        // Then: Network error should be displayed
    }

    func testLoginRetryAfterError() {
        // Given: User encountered a login error
        login(username: "invaliduser", password: "WrongPassword!")

        let errorMessage = app.staticTexts.containing(NSPredicate(format: "label CONTAINS[c] 'Invalid'"))
        XCTAssertTrue(errorMessage.firstMatch.waitForExistence(timeout: 5))

        // When: User enters correct credentials
        let usernameField = app.textFields["Username"]
        let passwordField = app.secureTextFields["Password"]
        let loginButton = app.buttons["Login"]

        app.clearText(in: usernameField)
        usernameField.typeText("testuser")

        app.clearText(in: passwordField)
        passwordField.typeText("TestPass123!")

        loginButton.tap()

        // Then: Login should succeed
        let residencesTab = app.tabBars.buttons["Residences"]
        XCTAssertTrue(residencesTab.waitForExistence(timeout: 10), "Should login successfully after retry")
    }
}