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package com.yixan.tools.common.util;

import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.TimeZone;
import java.util.regex.Pattern;

/**
 * 格式转换工具
 *
 * @author zhaohuihua
 * @version V1.0 2015年12月21日
 */
public abstract class ConvertUtil {

    @SuppressWarnings("unchecked")
    public static  T[] toArray(List list) {
        return list == null ? null : (T[]) list.toArray();
    }

    @SafeVarargs
    public static  List toList(T... array) {
        return array == null ? null : Arrays.asList(array);
    }

    /**
     * 对象转换为字符串

     * 与String.valueOf()的区别是如果对象为null则返回null
     *
     * @param object 对象
     * @return 字符串
     */
    public static String toString(Object object) {
        return object == null ? null : String.valueOf(object);
    }

    /**
     * 转换为数字
     *
     * @param value 源字符串, 支持乘法
     * @return 数字
     */
    public static int toInteger(String value) {
        return (int) toLong(value);
    }

    /**
     * 转换为数字
     *
     * @param value 源字符串, 支持乘法
     * @return 数字
     */
    public static long toLong(String value) throws NumberFormatException {
        if (VerifyUtil.isBlank(value)) {
            return 0;
        }

        value = value.trim();
        if (StringUtil.isDigit(value)) {
            return Long.valueOf(value);
        }

        if (value.contains("*")) {
            Pattern ptn = Pattern.compile("\\*");
            String[] values = ptn.split(value);
            long number = 1;
            boolean success = true;
            for (String string : values) {
                string = string.trim();
                if (VerifyUtil.isNotBlank(string) && StringUtil.isDigit(string)) {
                    number *= Long.valueOf(string);
                } else {
                    success = false;
                }
            }
            if (success) {
                return number;
            }
        }

        throw new NumberFormatException(value);
    }

    /**
     * 转换为持续字符串

     * 8000=00:00:08

     * 488000=00:08:08

     * 11288000=03:08:08

     * 97688000=1天03:08:08

     * 31536000000=365天00:00:00

     *
     * @author zhaohuihua
     * @param time 持续时间
     * @return 持续字符串
     */
    public static String toDuration(long time) {
        long day = 24 * 60 * 60 * 1000;
        SimpleDateFormat fmt = new SimpleDateFormat("HH:mm:ss", Locale.US);
        fmt.setTimeZone(TimeZone.getTimeZone("GMT+0"));
        String string = fmt.format(new Date(time));
        if (time > day) {
            string = (time / day) + "天" + string;
        }
        return string;
    }

    /**
     * 转换为Byte描述字符串
     *
     * @author zhaohuihua
     * @param size B
     * @return B/KB/MB/GB
     */
    public static String toByteString(long size) {
        double kb = 1024.0;
        double mb = kb * kb;
        double gb = mb * kb;
        DecimalFormat df = new DecimalFormat("0.##");
        if (size < kb) {
            return df.format(size) + "B";
        } else if (size < mb) {
            return df.format(size / kb) + "KB";
        } else if (size < gb) {
            return df.format(size / mb) + "MB";
        } else {
            return df.format(size / gb) + "GB";
        }
    }
}