Window and Platform Management

/**
 * Creates a single window application.
 */
@Composable
fun singleWindowApplication(
    state: WindowState = rememberWindowState(),
    visible: Boolean = true,
    title: String = "Untitled",
    icon: Painter? = null,
    undecorated: Boolean = false,
    transparent: Boolean = false,
    resizable: Boolean = true,
    enabled: Boolean = true,
    focusable: Boolean = true,
    alwaysOnTop: Boolean = false,
    onPreviewKeyEvent: (KeyEvent) -> Boolean = { false },
    onKeyEvent: (KeyEvent) -> Boolean = { false },
    content: @Composable WindowScope.() -> Unit
)

/**
 * Creates a window application with multiple windows.
 */
@Composable
fun application(
    exitProcessOnExit: Boolean = true,
    content: @Composable ApplicationScope.() -> Unit
)

/**
 * Creates a window within an application.
 */
@Composable
fun ApplicationScope.Window(
    onCloseRequest: () -> Unit,
    state: WindowState = rememberWindowState(),
    visible: Boolean = true,
    title: String = "Untitled",
    icon: Painter? = null,
    undecorated: Boolean = false,
    transparent: Boolean = false,
    resizable: Boolean = true,
    enabled: Boolean = true,
    focusable: Boolean = true,
    alwaysOnTop: Boolean = false,
    onPreviewKeyEvent: (KeyEvent) -> Boolean = { false },
    onKeyEvent: (KeyEvent) -> Boolean = { false },
    content: @Composable WindowScope.() -> Unit
)

/**
 * State holder for window properties.
 */
@Stable
class WindowState(
    placement: WindowPlacement = WindowPlacement.Floating,
    isMinimized: Boolean = false,
    position: WindowPosition = WindowPosition.PlatformDefault,
    size: DpSize = DpSize.Unspecified
) {
    /**
     * Current window placement mode.
     */
    var placement: WindowPlacement by mutableStateOf(placement)
    
    /**
     * Whether the window is minimized.
     */
    var isMinimized: Boolean by mutableStateOf(isMinimized)
    
    /**
     * Current window position.
     */
    var position: WindowPosition by mutableStateOf(position)
    
    /**
     * Current window size.
     */
    var size: DpSize by mutableStateOf(size)
}

/**
 * Remember a WindowState across recompositions.
 */
@Composable
fun rememberWindowState(
    placement: WindowPlacement = WindowPlacement.Floating,
    isMinimized: Boolean = false,
    position: WindowPosition = WindowPosition.PlatformDefault,
    size: DpSize = DpSize.Unspecified
): WindowState

/**
 * Window placement modes.
 */
enum class WindowPlacement {
    Floating, Maximized, Fullscreen
}

/**
 * Window position specification.
 */
sealed class WindowPosition {
    object PlatformDefault : WindowPosition()
    data class Absolute(val x: Dp, val y: Dp) : WindowPosition()
    data class Aligned(val alignment: Alignment) : WindowPosition()
}

/**
 * Size specification for windows.
 */
@Immutable
data class DpSize(
    val width: Dp,
    val height: Dp
) {
    companion object {
        val Unspecified: DpSize = DpSize(Dp.Unspecified, Dp.Unspecified)
        val Zero: DpSize = DpSize(0.dp, 0.dp)
    }
}

/**
 * Scope for window content.
 */
interface WindowScope {
    /**
     * The current window state.
     */
    val window: ComposeWindow
}

/**
 * Scope for application content.
 */
interface ApplicationScope {
    /**
     * Exit the application.
     */
    fun exitApplication()
}

// Single window application
fun main() = singleWindowApplication(
    title = "My Desktop App",
    state = rememberWindowState(
        placement = WindowPlacement.Floating,
        size = DpSize(800.dp, 600.dp),
        position = WindowPosition.Aligned(Alignment.Center)
    ),
    resizable = true,
    icon = painterResource("app_icon.png")
) {
    Column(
        modifier = Modifier.fillMaxSize().padding(16.dp)
    ) {
        Text("Desktop Application")
        Button(onClick = { 
            window.close() 
        }) {
            Text("Close Window")
        }
    }
}

// Multi-window application
fun main() = application {
    var isSecondWindowVisible by remember { mutableStateOf(false) }
    
    Window(
        onCloseRequest = ::exitApplication,
        title = "Main Window",
        state = rememberWindowState(size = DpSize(600.dp, 400.dp))
    ) {
        Column(modifier = Modifier.fillMaxSize().padding(16.dp)) {
            Text("Main Window")
            Button(onClick = { isSecondWindowVisible = true }) {
                Text("Open Second Window")
            }
        }
    }
    
    if (isSecondWindowVisible) {
        Window(
            onCloseRequest = { isSecondWindowVisible = false },
            title = "Second Window",
            state = rememberWindowState(
                position = WindowPosition.Absolute(100.dp, 100.dp),
                size = DpSize(400.dp, 300.dp)
            )
        ) {
            Column(modifier = Modifier.fillMaxSize().padding(16.dp)) {
                Text("Second Window")
                Button(onClick = { isSecondWindowVisible = false }) {
                    Text("Close")
                }
            }
        }
    }
}

// Window with custom properties
fun main() = singleWindowApplication(
    title = "Custom Window",
    undecorated = true,
    transparent = true,
    alwaysOnTop = true,
    state = rememberWindowState(
        placement = WindowPlacement.Floating,
        size = DpSize(300.dp, 200.dp)
    )
) {
    Box(
        modifier = Modifier
            .fillMaxSize()
            .background(
                Color.Black.copy(alpha = 0.8f),
                RoundedCornerShape(8.dp)
            )
    ) {
        Text(
            text = "Custom Window",
            color = Color.White,
            modifier = Modifier.align(Alignment.Center)
        )
    }
}

/**
 * Creates a UIViewController that hosts Compose content.
 */
fun ComposeUIViewController(
    configure: ComposeUIViewControllerConfiguration = ComposeUIViewControllerConfiguration(),
    content: @Composable () -> Unit
): UIViewController

/**
 * Configuration for Compose UIViewController.
 */
class ComposeUIViewControllerConfiguration {
    /**
     * Whether the view controller should automatically adjust for safe areas.
     */
    var automaticallyAdjustForSafeArea: Boolean = true
    
    /**
     * Background color for the view controller.
     */
    var backgroundColor: UIColor? = null
    
    /**
     * Whether to use system gestures.
     */
    var systemGestures: Boolean = true
    
    /**
     * Status bar style preference.
     */
    var statusBarStyle: UIStatusBarStyle? = null
}

/**
 * Access to iOS-specific platform features.
 */
object IOSPlatform {
    /**
     * Get the current safe area insets.
     */
    val safeAreaInsets: EdgeInsets
    
    /**
     * Whether the device is in dark mode.
     */
    val isDarkMode: Boolean
    
    /**
     * Current device orientation.
     */
    val deviceOrientation: DeviceOrientation
    
    /**
     * Show/hide the status bar.
     */
    fun setStatusBarHidden(hidden: Boolean, animated: Boolean = true)
    
    /**
     * Present a native iOS alert.
     */
    suspend fun showAlert(
        title: String,
        message: String,
        primaryButton: String = "OK",
        secondaryButton: String? = null
    ): Boolean
}

/**
 * Device orientation states.
 */
enum class DeviceOrientation {
    Portrait, PortraitUpsideDown, LandscapeLeft, LandscapeRight, Unknown
}

/**
 * Edge insets for safe areas.
 */
@Immutable
data class EdgeInsets(
    val top: Dp,
    val leading: Dp,
    val bottom: Dp,
    val trailing: Dp
)

/**
 * CompositionLocal for accessing iOS platform features.
 */
val LocalIOSPlatform: ProvidableCompositionLocal<IOSPlatform>

// Basic iOS integration
fun createMainViewController() = ComposeUIViewController(
    configure = ComposeUIViewControllerConfiguration().apply {
        automaticallyAdjustForSafeArea = true
        backgroundColor = UIColor.systemBackgroundColor
        statusBarStyle = UIStatusBarStyle.UIStatusBarStyleDefault
    }
) {
    IOSApp()
}

@Composable
fun IOSApp() {
    val platform = LocalIOSPlatform.current
    val safeAreaInsets = platform.safeAreaInsets
    
    Column(
        modifier = Modifier
            .fillMaxSize()
            .padding(
                top = safeAreaInsets.top,
                bottom = safeAreaInsets.bottom,
                start = safeAreaInsets.leading,
                end = safeAreaInsets.trailing
            )
    ) {
        Text("iOS Application")
        
        Button(onClick = {
            // Show native iOS alert
            coroutineScope.launch {
                val result = platform.showAlert(
                    title = "Confirmation",
                    message = "Are you sure?",
                    primaryButton = "Yes",
                    secondaryButton = "No"
                )
                if (result) {
                    // User tapped "Yes"
                }
            }
        }) {
            Text("Show Alert")
        }
        
        Text("Dark mode: ${platform.isDarkMode}")
        Text("Orientation: ${platform.deviceOrientation}")
    }
}

// Custom iOS view controller integration
class CustomIOSViewController : UIViewController {
    private val composeView = ComposeUIViewController {
        MyComposeContent()
    }
    
    override fun viewDidLoad() {
        super.viewDidLoad()
        
        // Add Compose content as child view controller
        addChild(composeView)
        view.addSubview(composeView.view)
        composeView.didMove(toParent = this)
        
        // Setup constraints
        composeView.view.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate(listOf(
            composeView.view.topAnchor.constraint(equalTo = view.safeAreaLayoutGuide.topAnchor),
            composeView.view.leadingAnchor.constraint(equalTo = view.leadingAnchor),
            composeView.view.trailingAnchor.constraint(equalTo = view.trailingAnchor),
            composeView.view.bottomAnchor.constraint(equalTo = view.safeAreaLayoutGuide.bottomAnchor)
        ))
    }
}

/**
 * Creates a Compose application for the web platform.
 */
fun CanvasBasedWindow(
    canvasElementId: String? = null,
    title: String = "Compose Application",
    content: @Composable () -> Unit
)

/**
 * Access to web-specific platform features.
 */
object WebPlatform {
    /**
     * The current browser window.
     */
    val window: Window
    
    /**
     * The current document.
     */
    val document: Document
    
    /**
     * Current viewport size.
     */
    val viewportSize: IntSize
    
    /**
     * Whether the page is loaded via HTTPS.
     */
    val isSecure: Boolean
    
    /**
     * Current page URL.
     */
    val currentUrl: String
    
    /**
     * Navigate to a new URL.
     */
    fun navigateTo(url: String)
    
    /**
     * Show a browser alert dialog.
     */
    fun alert(message: String)
    
    /**
     * Show a browser confirmation dialog.
     */
    fun confirm(message: String): Boolean
    
    /**
     * Download a file.
     */
    fun downloadFile(data: ByteArray, fileName: String, mimeType: String = "application/octet-stream")
    
    /**
     * Copy text to clipboard.
     */
    suspend fun copyToClipboard(text: String): Boolean
    
    /**
     * Read text from clipboard.
     */
    suspend fun readFromClipboard(): String?
}

/**
 * Browser storage access.
 */
object WebStorage {
    /**
     * Local storage operations.
     */
    object Local {
        fun setItem(key: String, value: String)
        fun getItem(key: String): String?
        fun removeItem(key: String)
        fun clear()
        val length: Int
    }
    
    /**
     * Session storage operations.
     */
    object Session {
        fun setItem(key: String, value: String)
        fun getItem(key: String): String?
        fun removeItem(key: String)
        fun clear()
        val length: Int
    }
}

/**
 * CompositionLocal for accessing web platform features.
 */
val LocalWebPlatform: ProvidableCompositionLocal<WebPlatform>

// Web application setup
fun main() {
    CanvasBasedWindow(
        canvasElementId = "ComposeTarget",
        title = "My Web App"
    ) {
        WebApp()
    }
}

@Composable
fun WebApp() {
    val platform = LocalWebPlatform.current
    var viewportSize by remember { mutableStateOf(platform.viewportSize) }
    var clipboardContent by remember { mutableStateOf("") }
    
    // Update viewport size on window resize
    LaunchedEffect(Unit) {
        // Listen for window resize events
        platform.window.addEventListener("resize") {
            viewportSize = platform.viewportSize
        }
    }
    
    Column(
        modifier = Modifier
            .fillMaxSize()
            .padding(16.dp)
    ) {
        Text("Web Application")
        Text("Viewport: ${viewportSize.width} x ${viewportSize.height}")
        Text("URL: ${platform.currentUrl}")
        Text("Secure: ${platform.isSecure}")
        
        Spacer(modifier = Modifier.height(16.dp))
        
        Row {
            Button(onClick = {
                platform.alert("Hello from Compose!")
            }) {
                Text("Show Alert")
            }
            
            Spacer(modifier = Modifier.width(8.dp))
            
            Button(onClick = {
                val confirmed = platform.confirm("Are you sure?")
                if (confirmed) {
                    platform.alert("Confirmed!")
                }
            }) {
                Text("Show Confirm")
            }
        }
        
        Spacer(modifier = Modifier.height(16.dp))
        
        // Clipboard operations
        TextField(
            value = clipboardContent,
            onValueChange = { clipboardContent = it },
            label = { Text("Clipboard content") },
            modifier = Modifier.fillMaxWidth()
        )
        
        Row {
            Button(onClick = {
                coroutineScope.launch {
                    platform.copyToClipboard(clipboardContent)
                }
            }) {
                Text("Copy to Clipboard")
            }
            
            Spacer(modifier = Modifier.width(8.dp))
            
            Button(onClick = {
                coroutineScope.launch {
                    val content = platform.readFromClipboard()
                    if (content != null) {
                        clipboardContent = content
                    }
                }
            }) {
                Text("Read from Clipboard")
            }
        }
        
        Spacer(modifier = Modifier.height(16.dp))
        
        // File download
        Button(onClick = {
            val data = "Hello, World!".toByteArray()
            platform.downloadFile(data, "hello.txt", "text/plain")
        }) {
            Text("Download File")
        }
        
        // Local storage operations
        Button(onClick = {
            WebStorage.Local.setItem("myKey", clipboardContent)
            platform.alert("Saved to local storage!")
        }) {
            Text("Save to Local Storage")
        }
        
        Button(onClick = {
            val stored = WebStorage.Local.getItem("myKey")
            if (stored != null) {
                clipboardContent = stored
            }
        }) {
            Text("Load from Local Storage")
        }
    }
}

/**
 * A modal dialog window.
 */
@Composable
fun Dialog(
    onDismissRequest: () -> Unit,
    properties: DialogProperties = DialogProperties(),
    content: @Composable () -> Unit
)

/**
 * Properties for configuring dialog behavior.
 */
@Immutable
data class DialogProperties(
    val dismissOnBackPress: Boolean = true,
    val dismissOnClickOutside: Boolean = true,
    val securePolicy: SecureFlagPolicy = SecureFlagPolicy.Inherit,
    val usePlatformDefaultWidth: Boolean = true,
    val decorFitsSystemWindows: Boolean = true
)

/**
 * Security policies for dialog windows.
 */
enum class SecureFlagPolicy {
    Inherit, SecureOn, SecureOff
}

/**
 * A popup window positioned relative to its parent.
 */
@Composable
fun Popup(
    alignment: Alignment = Alignment.TopStart,
    offset: IntOffset = IntOffset.Zero,
    onDismissRequest: (() -> Unit)? = null,
    properties: PopupProperties = PopupProperties(),
    content: @Composable () -> Unit
)

/**
 * Properties for configuring popup behavior.
 */
@Immutable
data class PopupProperties(
    val focusable: Boolean = false,
    val dismissOnBackPress: Boolean = true,
    val dismissOnClickOutside: Boolean = true,
    val securePolicy: SecureFlagPolicy = SecureFlagPolicy.Inherit,
    val excludeFromSystemGesture: Boolean = true,
    val clippingEnabled: Boolean = true,
    val usePlatformDefaultWidth: Boolean = false
)

/**
 * Desktop-specific file dialogs.
 */
object FileDialog {
    /**
     * Show a file chooser dialog.
     */
    suspend fun openFileDialog(
        title: String = "Open File",
        allowedExtensions: List<String> = emptyList(),
        allowMultiSelection: Boolean = false,
        initialDirectory: String? = null
    ): List<String>?
    
    /**
     * Show a save file dialog.
     */
    suspend fun saveFileDialog(
        title: String = "Save File",
        allowedExtensions: List<String> = emptyList(),
        initialFileName: String? = null,
        initialDirectory: String? = null
    ): String?
    
    /**
     * Show a directory chooser dialog.
     */
    suspend fun openDirectoryDialog(
        title: String = "Choose Directory",
        initialDirectory: String? = null
    ): String?
}

// Basic dialog usage
@Composable
fun DialogExample() {
    var showDialog by remember { mutableStateOf(false) }
    
    Column {
        Button(onClick = { showDialog = true }) {
            Text("Show Dialog")
        }
        
        if (showDialog) {
            Dialog(
                onDismissRequest = { showDialog = false },
                properties = DialogProperties(
                    dismissOnBackPress = true,
                    dismissOnClickOutside = true
                )
            ) {
                Card(
                    modifier = Modifier
                        .fillMaxWidth()
                        .padding(16.dp),
                    shape = RoundedCornerShape(16.dp)
                ) {
                    Column(
                        modifier = Modifier.padding(24.dp),
                        verticalArrangement = Arrangement.spacedBy(16.dp)
                    ) {
                        Text(
                            text = "Dialog Title",
                            style = MaterialTheme.typography.h6
                        )
                        
                        Text("This is the dialog content.")
                        
                        Row(
                            modifier = Modifier.fillMaxWidth(),
                            horizontalArrangement = Arrangement.End
                        ) {
                            TextButton(onClick = { showDialog = false }) {
                                Text("Cancel")
                            }
                            TextButton(onClick = { showDialog = false }) {
                                Text("OK")
                            }
                        }
                    }
                }
            }
        }
    }
}

// Popup window example
@Composable
fun PopupExample() {
    var showPopup by remember { mutableStateOf(false) }
    
    Box {
        Button(onClick = { showPopup = !showPopup }) {
            Text("Toggle Popup")
        }
        
        if (showPopup) {
            Popup(
                alignment = Alignment.TopEnd,
                offset = IntOffset(0, 40),
                onDismissRequest = { showPopup = false }
            ) {
                Card(
                    modifier = Modifier.size(200.dp, 150.dp),
                    elevation = 8.dp
                ) {
                    Column(
                        modifier = Modifier.padding(16.dp),
                        verticalArrangement = Arrangement.spacedBy(8.dp)
                    ) {
                        Text("Popup Content")
                        Text("Click outside to dismiss")
                        Button(onClick = { showPopup = false }) {
                            Text("Close")
                        }
                    }
                }
            }
        }
    }
}

// File dialog example (Desktop)
@Composable
fun FileDialogExample() {
    var selectedFiles by remember { mutableStateOf<List<String>>(emptyList()) }
    var saveLocation by remember { mutableStateOf<String?>(null) }
    val coroutineScope = rememberCoroutineScope()
    
    Column(verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Button(onClick = {
            coroutineScope.launch {
                val files = FileDialog.openFileDialog(
                    title = "Select Images",
                    allowedExtensions = listOf("jpg", "png", "gif"),
                    allowMultiSelection = true
                )
                if (files != null) {
                    selectedFiles = files
                }
            }
        }) {
            Text("Open Files")
        }
        
        if (selectedFiles.isNotEmpty()) {
            Text("Selected files:")
            selectedFiles.forEach { file ->
                Text("• $file", style = MaterialTheme.typography.body2)
            }
        }
        
        Button(onClick = {
            coroutineScope.launch {
                val location = FileDialog.saveFileDialog(
                    title = "Save Document",
                    allowedExtensions = listOf("txt", "md"),
                    initialFileName = "document.txt"
                )
                saveLocation = location
            }
        }) {
            Text("Save File")
        }
        
        saveLocation?.let { location ->
            Text("Save location: $location")
        }
        
        Button(onClick = {
            coroutineScope.launch {
                val directory = FileDialog.openDirectoryDialog(
                    title = "Choose Output Directory"
                )
                if (directory != null) {
                    // Handle directory selection
                }
            }
        }) {
            Text("Choose Directory")
        }
    }
}