import { Dimensions, Platform } from 'react-native';
import { initialWindowMetrics } from 'react-native-safe-area-context';
import { isNavigationBarTranslucent } from '../nativeModulesHelpers/UNNavigationBarHelper';

const isAndroid = Platform.OS === 'android';
const isAndroid10To14 = isAndroid && Platform.Version >= 29 && Platform.Version < 35;
const isAndroid15AndAbove = isAndroid && Platform.Version >= 35;

const insets = initialWindowMetrics?.insets ?? { top: 0, bottom: 0, left: 0, right: 0 };
const windowHeight = Dimensions.get('window').height;
const screenHeight = Dimensions.get('screen').height;

// Detect edge-to-edge on API 35+ by comparing window to screen height
const heightDifference = Math.abs(screenHeight - windowHeight);
const isEdgeToEdgeActive = isAndroid15AndAbove && heightDifference < 10;

// Resolved once at module load time; defaults to false until resolved.
// The native call is fast (reads a window flag), so it resolves before
// any bottom sheet is opened.
let _navBarTranslucent = false;

if (isAndroid) {
  isNavigationBarTranslucent().then((result) => {
    _navBarTranslucent = result;
  });
}

const calculateFullScreenHeight = (): number => {
  if (isAndroid15AndAbove) {
    return isEdgeToEdgeActive ? screenHeight : windowHeight;
  } else if (isAndroid10To14) {
    // screenHeight is stable even when translucent status bar alters windowHeight
    return screenHeight;
  }
  return windowHeight;
};

const fullScreenHeight = calculateFullScreenHeight();

const calculateContentHeight = (): number => {
  if (isAndroid15AndAbove && !isEdgeToEdgeActive) {
    return windowHeight;
  }
  if (isAndroid10To14) {
    return fullScreenHeight - insets.top - insets.bottom;
  }
  return fullScreenHeight - insets.top;
};

const contentHeight = calculateContentHeight();

export const useSafeAreaDimensions = () => {
  const shouldApplyBottomInset = isEdgeToEdgeActive || _navBarTranslucent;
  const effectiveBottomInset = shouldApplyBottomInset ? insets.bottom : 0;

  return {
    insets,
    fullScreenHeight,
    contentHeight,
    isAndroid10AndAbove: isAndroid && Platform.Version >= 29,
    isEdgeToEdgeActive,
    effectiveBottomInset,
  };
};