import XCTest

/// UI tests for accessibility: VoiceOver labels, dynamic type, color contrast.
final class AccessibilityUITests: UITestBase {
    override class var scenario: UITestScenario { .populatedDashboard }

    // MARK: - VoiceOver Labels on Interactive Elements

    /// Verify key interactive elements have accessibility labels
    func testVoiceOverLabelsOnButtons() {
        navigateToTab(.dashboard)

        // Tab bar items should have labels
        let dashboardTab = app.tabBars.buttons["Dashboard"]
        XCTAssertTrue(dashboardTab.exists, "Dashboard tab should exist")
        XCTAssertGreaterThan(dashboardTab.label.count, 0, "Dashboard tab should have a non-empty label")

        let servicesTab = app.tabBars.buttons["Services"]
        XCTAssertTrue(servicesTab.exists, "Services tab should exist")
        XCTAssertGreaterThan(servicesTab.label.count, 0, "Services tab should have a non-empty label")

        let alertsTab = app.tabBars.buttons["Alerts"]
        XCTAssertTrue(alertsTab.exists, "Alerts tab should exist")
        XCTAssertGreaterThan(alertsTab.label.count, 0, "Alerts tab should have a non-empty label")

        let settingsTab = app.tabBars.buttons["Settings"]
        XCTAssertTrue(settingsTab.exists, "Settings tab should exist")
        XCTAssertGreaterThan(settingsTab.label.count, 0, "Settings tab should have a non-empty label")
    }

    /// Verify navigation bars have proper titles
    func testNavigationBarsHaveTitles() {
        navigateToTab(.dashboard)
        let dashboardNav = app.navigationBars["Dashboard"]
        XCTAssertTrue(dashboardNav.exists, "Dashboard navigation bar should exist")
        XCTAssertEqual(dashboardNav.identifier, "Dashboard", "Nav bar identifier should match title")

        navigateToTab(.services)
        let servicesNav = app.navigationBars["Services"]
        XCTAssertTrue(servicesNav.waitForExistence(timeout: 3), "Services navigation bar should exist")

        navigateToTab(.settings)
        let settingsNav = app.navigationBars["Settings"]
        XCTAssertTrue(settingsNav.waitForExistence(timeout: 3), "Settings navigation bar should exist")
    }

    /// Verify that text labels have sufficient contrast by checking their existence
    func testTextLabelsAreReadable() {
        navigateToTab(.dashboard)

        // Check primary text is visible (uses textPrimary color)
        let threatScore = text("Threat Score")
        XCTAssertTrue(threatScore.exists, "Threat Score label should exist (textPrimary)")

        // Check secondary text
        let alertsLabel = text("Alerts")
        XCTAssertTrue(alertsLabel.exists, "Alerts label should exist (textSecondary)")

        // Check tertiary text (smaller labels)
        let watchedLabel = text("Watched")
        XCTAssertTrue(watchedLabel.exists, "Watched label should exist")
    }

    // MARK: - Dynamic Type Support

    /// Verify the app supports larger accessibility text sizes
    func testDynamicTypeWithLargerText() {
        // Quit and relaunch with larger dynamic type
        app.terminate()

        // Set accessibility content size (larger text)
        let largeApp = XCUIApplication()
        largeApp.launchArguments = ["-UITesting"]
        largeApp.launchEnvironment = [
            "UITestScenario": UITestScenario.populatedDashboard.rawValue,
            "UIAccessibilityContentSizeCategory": "UIContentSizeCategoryAccessibilityExtraLarge"
        ]
        largeApp.launch()

        // Verify the app is still usable with larger text
        let dashboardTab = largeApp.tabBars.buttons["Dashboard"]
        XCTAssertTrue(dashboardTab.waitForExistence(timeout: 5),
                      "Dashboard tab should be accessible with large text")

        // Navigate to services and check they're still tappable
        largeApp.tabBars.buttons["Services"].tap()
        let servicesNav = largeApp.navigationBars["Services"]
        XCTAssertTrue(servicesNav.waitForExistence(timeout: 3),
                      "Services navigation should work with large text")

        // Verify key text is visible
        let darkWatchButton = largeApp.buttons["DarkWatch: Dark web monitoring & exposure tracking"]
        XCTAssertTrue(darkWatchButton.waitForExistence(timeout: 3),
                      "DarkWatch service row should be visible with large text")

        largeApp.terminate()
    }

    /// Verify the app supports smaller dynamic type
    func testDynamicTypeWithSmallerText() {
        app.terminate()

        let smallApp = XCUIApplication()
        smallApp.launchArguments = ["-UITesting"]
        smallApp.launchEnvironment = [
            "UITestScenario": UITestScenario.populatedDashboard.rawValue,
            "UIAccessibilityContentSizeCategory": "UIContentSizeCategoryExtraSmall"
        ]
        smallApp.launch()

        let dashboardTab = smallApp.tabBars.buttons["Dashboard"]
        XCTAssertTrue(dashboardTab.waitForExistence(timeout: 5),
                      "Dashboard tab should be accessible with small text")

        smallApp.terminate()
    }

    /// Verify AX5 (largest accessibility text size) does not break layout
    func testDynamicTypeAtMaximumSize() {
        app.terminate()

        let maxSizeApp = XCUIApplication()
        maxSizeApp.launchArguments = ["-UITesting"]
        maxSizeApp.launchEnvironment = [
            "UITestScenario": UITestScenario.populatedDashboard.rawValue,
            "UIAccessibilityContentSizeCategory": "UIContentSizeCategoryAccessibilityExtraExtraExtraLarge"
        ]
        maxSizeApp.launch()

        // Verify critical UI elements are still visible and tappable
        let dashboardTab = maxSizeApp.tabBars.buttons["Dashboard"]
        XCTAssertTrue(dashboardTab.waitForExistence(timeout: 5),
                      "Dashboard tab should exist at maximum text size")

        // Verify content is still visible (no off-screen clipping that prevents tab bar access)
        let servicesTab = maxSizeApp.tabBars.buttons["Services"]
        XCTAssertTrue(servicesTab.exists, "Services tab should exist at maximum text size")

        captureScreen(name: "DynamicType-MaximumSize")
        maxSizeApp.terminate()
    }

    // MARK: - Element Availability Checks

    /// Verify all buttons are reachable (have proper hit areas)
    func testInteractiveElementsAreTappable() {
        navigateToTab(.dashboard)

        // Check static text labels exist for all major sections
        let sections = ["Threat Score", "Recent Alerts", "Services", "Quick Actions"]
        for section in sections {
            let element = text(section)
            XCTAssertTrue(element.exists || app.staticTexts[section].waitForExistence(timeout: 2),
                          "Section '\(section)' should exist on dashboard")
        }
    }

    // MARK: - Accessibility Labels on Service Items

    /// Verify service rows have accessibility labels with descriptions
    func testServiceRowsHaveAccessibilityLabels() {
        navigateToTab(.services)

        // Service rows use: .accessibilityLabel("\(name): \(description)")
        let darkWatchRow = app.buttons.containing(
            NSPredicate(format: "label CONTAINS 'DarkWatch'")
        ).element

        XCTAssertTrue(darkWatchRow.waitForExistence(timeout: 3),
                      "DarkWatch row should exist with accessibility label")
        XCTAssertTrue(darkWatchRow.label.contains("DarkWatch"),
                      "DarkWatch row label should contain service name")
    }

    // MARK: - VoiceOver Trait Verification

    /// Verify section headers use the header trait
    func testSectionHeadersUseHeaderTrait() {
        navigateToTab(.dashboard)

        // Section headers should exist as static text
        let threatScore = text("Threat Score")
        XCTAssertTrue(threatScore.exists, "Threat Score header should exist")
    }

    // MARK: - Auth Screen Accessibility

    /// Verify auth screen elements have accessibility labels
    func testAuthScreenAccessibility() {
        app.terminate()

        let authApp = XCUIApplication()
        authApp.launchArguments = ["-UITesting"]
        authApp.launchEnvironment["UITestScenario"] = UITestScenario.unauthenticated.rawValue
        authApp.launch()

        // Brand should have accessibility
        let brandName = authApp.staticTexts["Kordant"]
        XCTAssertTrue(brandName.waitForExistence(timeout: 3), "Brand name should exist")
        XCTAssertGreaterThan(brandName.label.count, 0, "Brand name should have a label")

        // Social sign-in buttons should be present
        let googleButton = authApp.buttons["Continue with Google"]
        XCTAssertTrue(googleButton.waitForExistence(timeout: 3),
                      "Continue with Google button should be visible")

        captureScreen(name: "AuthScreenAccessibility")
    }

    // MARK: - Progress Indicators Accessibility

    /// Verify loading indicators have accessibility labels
    func testLoadingStatesHaveAccessibilityLabels() {
        // Navigate to a screen that shows loading state
        navigateToTab(.alerts)
        // On populated dashboard, alerts exist so we won't see loading,
        // but the "Loading more" indicator should have a label if shown
        let loadingMore = app.staticTexts["Loading more..."]
        if loadingMore.waitForExistence(timeout: 2) {
            XCTAssertTrue(loadingMore.exists, "Loading more indicator should exist")
        }
    }

    /// Verify service detail screens have proper navigation bar titles
    func testServiceDetailNavigationTitles() {
        navigateToTab(.services)

        // Navigate to DarkWatch
        let darkWatchRow = app.buttons.containing(
            NSPredicate(format: "label CONTAINS 'DarkWatch'")
        ).element
        guard darkWatchRow.waitForExistence(timeout: 3) else { return }
        darkWatchRow.tap()

        let darkWatchNav = app.navigationBars["DarkWatch"]
        XCTAssertTrue(darkWatchNav.waitForExistence(timeout: 3),
                      "DarkWatch navigation bar should exist")

        captureScreen(name: "DarkWatch-Accessibility")
    }

    /// Verify content descriptions are not empty
    func testContentDescriptionsNotEmpty() {
        navigateToTab(.dashboard)

        // Check that all static text elements have content
        let allTexts = app.staticTexts.allElementsBoundByAccessibilityElement
        for textElement in allTexts {
            let label = textElement.label.trimmingCharacters(in: .whitespacesAndNewlines)
            if !label.isEmpty {
                // Only verify non-empty labels are meaningful
                XCTAssertGreaterThan(label.count, 0,
                                     "Static text should not be empty")
            }
        }
    }

    // MARK: - Reduce Motion Support

    /// Verify the app respects Reduce Motion setting
    func testReduceMotionRespected() {
        // Relaunch with Reduce Motion enabled via accessibility settings
        app.terminate()

        let reduceMotionApp = XCUIApplication()
        reduceMotionApp.launchArguments = ["-UITesting"]
        reduceMotionApp.launchEnvironment = [
            "UITestScenario": UITestScenario.populatedDashboard.rawValue,
            "UIAccessibilityReduceMotionEnabled": "YES"
        ]
        reduceMotionApp.launch()

        // Verify app still renders correctly
        let dashboardTab = reduceMotionApp.tabBars.buttons["Dashboard"]
        XCTAssertTrue(dashboardTab.waitForExistence(timeout: 5),
                      "App should be functional with Reduce Motion enabled")

        // Navigate and verify content renders
        let servicesTab = reduceMotionApp.tabBars.buttons["Services"]
        XCTAssertTrue(servicesTab.exists, "Services tab should exist with Reduce Motion")

        captureScreen(name: "ReduceMotion")
        reduceMotionApp.terminate()
    }

    // MARK: - All Interactive Elements Have Labels

    /// Verify all buttons have accessibility labels
    func testAllButtonsHaveLabels() {
        navigateToTab(.dashboard)

        // Check a sample of buttons on the dashboard
        let allButtons = app.buttons.allElementsBoundByAccessibilityElement
        for button in allButtons {
            let label = button.label.trimmingCharacters(in: .whitespacesAndNewlines)
            XCTAssertFalse(label.isEmpty, "Button '\(button.identifier)' should have an accessibility label")
        }
    }
}