import { EARTH_RADIUS } from '@/constants';

export function distance(latLng1, latLng2) {
    const lat1 = (latLng1[0] * Math.PI) / 180;
    const lng1 = (latLng1[1] * Math.PI) / 180;

    const lat2 = (latLng2[0] * Math.PI) / 180;
    const lng2 = (latLng2[1] * Math.PI) / 180;

    const a = (
        (Math.sin((lat2 - lat1) / 2.0) ** 2)
        + (Math.cos(lat1) * Math.cos(lat2) * (Math.sin((lng2 - lng1) / 2.0) ** 2))
    );
    const c = 2.0 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));

    return EARTH_RADIUS * c;
}

export function mockLocation() {
    // Over Paris
    /*
    const LAT_MIN = 48.854031;
    const LNG_MIN = 2.281279;
    const LAT_MAX = 48.886123;
    const LNG_MAX = 2.392742;
    */

    // Over small area
    const LAT_MIN = 48.81788;
    const LNG_MIN = 2.31723;
    const LAT_MAX = 48.81952;
    const LNG_MAX = 2.32077;

    const newLocation = {
        coords: {
            accuracy: 10, // In meters
            latitude: (Math.random() * (LAT_MAX - LAT_MIN)) + LAT_MIN,
            longitude: (Math.random() * (LNG_MAX - LNG_MIN)) + LNG_MIN,
            heading: null, // 20 * (Math.PI / 180),
        },
        timestamp: new Date().getTime(),
    };
    console.log('New mock location: ', newLocation);
    return newLocation;
}

export function storageAvailable(type) {
    let storage;
    try {
        storage = window[type];
        const x = '__storage_test__';
        storage.setItem(x, x);
        storage.removeItem(x);
        return true;
    } catch (e) {
        return e instanceof DOMException && (
            // everything except Firefox
            e.code === 22
            // Firefox
            || e.code === 1014
            // test name field too, because code might not be present
            // everything except Firefox
            || e.name === 'QuotaExceededError'
            // Firefox
            || e.name === 'NS_ERROR_DOM_QUOTA_REACHED'
        )
        // acknowledge QuotaExceededError only if there's something already stored
        && storage.length !== 0;
    }
}