import { Dimensions, Platform, StatusBar } from 'react-native';


export function isIphoneX() {
    const dimen = Dimensions.get('window');
    return (
        Platform.OS === 'ios' &&
        !Platform.isPad &&
        !Platform.isTVOS &&
        ((dimen.height === 812 || dimen.width === 812) || (dimen.height === 896 || dimen.width === 896))
    );
}

export function ifIphoneX(iphoneXStyle, regularStyle) {
    if (isIphoneX()) {
        return iphoneXStyle;
    }
    return regularStyle;
}

export function getStatusBarHeight(safe) {
    return Platform.select({
        ios: ifIphoneX(safe ? 44 : 30, 20),
        android: StatusBar.currentHeight
    });
}

export function getBottomSpace() {
    return isIphoneX() ? 34 : 0;
}

export function timeConverter(UNIX_timestamp) {
    var a = new Date(UNIX_timestamp * 1000);
    var year = a.getFullYear();
    var month = a.getMonth() + 1;
    var date = a.getDate();
    var hour = a.getHours();
    var min = a.getMinutes();
    var sec = a.getSeconds();
    var time = formatInt(hour) + ':' + formatInt(min) + ':' + formatInt(sec) + ' ' + formatInt(date) + '.' + formatInt(month) + '.' + year;
    return time;
}

function formatInt(num) {
    return ("00" + num).slice(-2)
}

export function calcCrow(lat1, lon1, lat2, lon2) 
    {
      var R = 6371; // km
      var dLat = toRad(lat2-lat1);
      var dLon = toRad(lon2-lon1);
      var lat1 = toRad(lat1);
      var lat2 = toRad(lat2);

      var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
        Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2); 
      var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
      var d = R * c;
      return d;
    }

    // Converts numeric degrees to radians
    function toRad(Value) 
    {
        return Value * Math.PI / 180;
    }