uzor-mobile 1.0.43

//! iOS-specific platform implementation
//!
//! This module provides iOS integration via Objective-C bindings.

use uzor::platform::{PlatformEvent, SystemTheme};
use crate::{HapticStyle, ScreenOrientation};

#[cfg(feature = "ios")]
use objc2::runtime::NSObject;

/// iOS-specific backend
pub struct IosBackend {
    #[cfg(feature = "ios")]
    _screen_scale: f64,

    // Stub fields for when ios feature is not enabled
    #[cfg(not(feature = "ios"))]
    _stub: (),
}

impl IosBackend {
    /// Create a new iOS backend
    ///
    /// # Errors
    ///
    /// Returns an error if the iOS runtime is not available.
    pub fn new() -> Result<Self, String> {
        #[cfg(feature = "ios")]
        {
            // TODO: Get UIScreen scale
            // For now, return a stub implementation
            Err("iOS backend not fully implemented yet".to_string())
        }

        #[cfg(not(feature = "ios"))]
        {
            Ok(Self { _stub: () })
        }
    }

    /// Get screen size in physical pixels
    pub fn screen_size(&self) -> (u32, u32) {
        #[cfg(feature = "ios")]
        {
            // TODO: Get from UIScreen.mainScreen.bounds
            // For now, return iPhone 14 Pro resolution
            (1179, 2556)
        }

        #[cfg(not(feature = "ios"))]
        {
            (1179, 2556)
        }
    }

    /// Get scale factor (retina scale)
    pub fn scale_factor(&self) -> f64 {
        #[cfg(feature = "ios")]
        {
            // TODO: Get from UIScreen.mainScreen.scale
            // Modern iPhones are typically 3x
            3.0
        }

        #[cfg(not(feature = "ios"))]
        {
            3.0
        }
    }

    /// Get safe area insets (for notch and home indicator)
    pub fn safe_area_insets(&self) -> (f64, f64, f64, f64) {
        #[cfg(feature = "ios")]
        {
            // TODO: Get from UIWindow.safeAreaInsets
            // iPhone 14 Pro typical values (in points, multiply by scale for pixels)
            let scale = self.scale_factor();
            let top = 59.0 * scale; // Status bar + notch
            let bottom = 34.0 * scale; // Home indicator
            (top, 0.0, bottom, 0.0)
        }

        #[cfg(not(feature = "ios"))]
        {
            (177.0, 0.0, 102.0, 0.0) // Typical values for iPhone with notch
        }
    }

    /// Get current screen orientation
    pub fn orientation(&self) -> ScreenOrientation {
        #[cfg(feature = "ios")]
        {
            // TODO: Get from UIDevice.currentDevice.orientation
            ScreenOrientation::Portrait
        }

        #[cfg(not(feature = "ios"))]
        {
            ScreenOrientation::Portrait
        }
    }

    /// Trigger haptic feedback
    pub fn haptic_feedback(&mut self, style: HapticStyle) {
        #[cfg(feature = "ios")]
        {
            // TODO: Use UIImpactFeedbackGenerator, UISelectionFeedbackGenerator,
            // or UINotificationFeedbackGenerator based on style
            let _ = style;
        }

        #[cfg(not(feature = "ios"))]
        {
            let _ = style;
        }
    }

    /// Poll for platform events
    pub fn poll_event(&mut self) -> Option<PlatformEvent> {
        #[cfg(feature = "ios")]
        {
            // TODO: Process iOS touch events from UIApplication
            None
        }

        #[cfg(not(feature = "ios"))]
        {
            None
        }
    }

    /// Set window title (no-op on iOS)
    pub fn set_title(&mut self, _title: &str) {
        // iOS apps don't have window titles
    }

    /// Get clipboard text
    pub fn get_clipboard_text(&self) -> Option<String> {
        #[cfg(feature = "ios")]
        {
            // TODO: Use UIPasteboard.generalPasteboard.string
            None
        }

        #[cfg(not(feature = "ios"))]
        {
            None
        }
    }

    /// Set clipboard text
    pub fn set_clipboard_text(&mut self, text: &str) -> Result<(), String> {
        #[cfg(feature = "ios")]
        {
            // TODO: Use UIPasteboard.generalPasteboard.string = text
            let _ = text;
            Err("iOS clipboard not implemented yet".to_string())
        }

        #[cfg(not(feature = "ios"))]
        {
            let _ = text;
            Err("iOS feature not enabled".to_string())
        }
    }

    /// Open URL in Safari
    pub fn open_url(&self, url: &str) -> Result<(), String> {
        #[cfg(feature = "ios")]
        {
            // TODO: Use UIApplication.sharedApplication.openURL
            let _ = url;
            Err("iOS URL opening not implemented yet".to_string())
        }

        #[cfg(not(feature = "ios"))]
        {
            let _ = url;
            Err("iOS feature not enabled".to_string())
        }
    }

    /// Get system theme
    pub fn system_theme(&self) -> Option<SystemTheme> {
        #[cfg(feature = "ios")]
        {
            // TODO: Check UITraitCollection.currentTraitCollection.userInterfaceStyle
            Some(SystemTheme::Light)
        }

        #[cfg(not(feature = "ios"))]
        {
            Some(SystemTheme::Light)
        }
    }

    /// Set IME position
    pub fn set_ime_position(&mut self, _x: f64, _y: f64) {
        // iOS handles keyboard positioning automatically
    }

    /// Show virtual keyboard
    pub fn show_keyboard(&mut self) {
        #[cfg(feature = "ios")]
        {
            // TODO: Call becomeFirstResponder on UITextField/UITextView
        }
    }

    /// Hide virtual keyboard
    pub fn hide_keyboard(&mut self) {
        #[cfg(feature = "ios")]
        {
            // TODO: Call resignFirstResponder on UITextField/UITextView
        }
    }
}

// =============================================================================
// Helper Functions (when ios feature is enabled)
// =============================================================================

#[cfg(feature = "ios")]
mod objc_helpers {
    use super::*;

    /// Get UIScreen main screen
    ///
    /// TODO: Implement using objc2 to call [UIScreen mainScreen]
    pub fn get_main_screen() -> Option<*mut NSObject> {
        // Placeholder
        None
    }

    /// Get UIWindow safe area insets
    ///
    /// TODO: Implement using objc2 to access window.safeAreaInsets
    pub fn get_safe_area_insets() -> (f64, f64, f64, f64) {
        // Placeholder
        (0.0, 0.0, 0.0, 0.0)
    }

    /// Trigger haptic feedback
    ///
    /// TODO: Implement using UIImpactFeedbackGenerator etc.
    pub fn trigger_haptic(_style: HapticStyle) {
        // Placeholder
    }

    /// Get CAMetalLayer for rendering
    pub fn get_metal_layer() -> Option<*mut NSObject> {
        // TODO: Create or get existing CAMetalLayer
        None
    }
}