// -防抖
export function debounce(fn: Function, wait: number) {
    let delay = wait || 500
    let timer: any = null;
    return function () {
        let args = arguments;
        if (timer) {
            clearTimeout(timer)
            console.log('debounce')
        }
        let callNow = !timer
        timer = setTimeout(() => {
            console.log('debounce send')
            timer = null
        }, delay)
        if (callNow) fn.apply(null, args)
    }
}

// -节流
export function throttle(fn: Function, wait: number) {
    let delay = wait || 500
    let timer: any = null;
    return function () {
        if (timer) {
            console.log('throttle');
            return
        }
        timer = setTimeout(() => {
            console.log('throttle send');
            fn.apply(null, arguments)
            timer = null
        }, delay)
    }
}

//计算坐标距离
export function calcMapDistance(lat1: number, lng1: number, lat2: number, lng2: number) {
    let radLat1 = (lat1 * Math.PI) / 180.0;
    let radLat2 = (lat2 * Math.PI) / 180.0;
    let a = radLat1 - radLat2;
    let b = (lng1 * Math.PI) / 180.0 - (lng2 * Math.PI) / 180.0;
    let s =
        2 *
        Math.asin(
            Math.sqrt(
                Math.pow(Math.sin(a / 2), 2) +
                Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)
            )
        );
    s = s * 6378.137; // EARTH_RADIUS;
    s = Math.round(s * 10000) / 10000;
    return s.toFixed(2);
}

export function groupByKey(elements: Array<any>, key: string) {
    return elements.reduce((groups, item) => {
        const groupKey = item[key];
        if (!groups[groupKey]) {
            groups[groupKey] = [];
        }
        groups[groupKey].push(item);
        return groups;
    }, {});
}

export function getDictName(code:string, value: string) {
    let dictStorage:any = uni.getStorageSync('dict');
    console.log(dictStorage)
    if(!dictStorage){
        return value;
    }

    let elements = dictStorage[code];
    if(elements){
        let ele = elements.find((k: any)=>k.value===value);
        if(ele){
            return ele.name;
        }
    }
    return value;
}