/*
 *计算每个月有几周
 */
const weekMethods = (date) => {
  let fristDay = date;
  let endDay = getCurrentMonthLastDay(fristDay).getDate();
  let dayArr = [];
  let week = fristDay.getDay();
  if (week == 0) {
    dayArr = test(endDay, 6, dayArr);
  } else if (week == 1) {
    dayArr = test(endDay, 5, dayArr);
  } else if (week == 2) {
    dayArr = test(endDay, 4, dayArr);
  } else if (week == 3) {
    dayArr = test(endDay, 3, dayArr);
  } else if (week == 4) {
    dayArr = test(endDay, 2, dayArr);
  } else if (week == 5) {
    dayArr = test(endDay, 1, dayArr);
  } else if (week == 6) {
    dayArr = test(endDay, 0, dayArr);
  }
  return dayArr;
};

const test = (endDay, num, arr) => {
  if (num != 6) {
    arr.push({
      startDay: "01",
      endDay: "0" + (1 + num)
    })
  } else {
    arr.push({
      startDay: "01",
      endDay: "07"
    })
  }

  for (let i = 1 + num + 1; i < endDay + 1; i = i + 7) {
    let obj = {};
    if (i == endDay) {
      obj = {
        startDay: i,
        endDay: i
      };
    } else if (i + 6 > endDay) {
      obj = {
        startDay: i,
        endDay: endDay
      };

    } else {
      obj = {
        startDay: i > 10 ? i : "0" + i,
        endDay: i + 6 > 10 ? i + 6 : "0" + (i + 6)
      };
    }
    arr.push(obj);
  }
  arr.forEach((item, index) => {
    item.text = "第" + (index + 1) + "周(" + item.startDay + "-" + item.endDay + ")"
    item.value = index + 1
  })

  return arr;
};

/**
 * 获取当前月的最后一天
 * */
const getCurrentMonthLastDay = (date) => {
  // let date = new Date();
  let currentMonth = date.getMonth();
  let nextMonth = ++currentMonth;
  let nextMonthFirstDay = new Date(date.getFullYear(), nextMonth, 1);
  let oneDay = 1000 * 60 * 60 * 24;
  let lastTime = new Date(nextMonthFirstDay - oneDay);
  return lastTime;
};

/**
 * 年循环
 */
// export const yearLoop = (minDate, maxDate) => {
//   let yearArr = [];
//   if (!minDate) {
//     minDate = new Date().getFullYear() - 5;
//   }
//   if (!maxDate) {
//     maxDate = minDate + 10;
//   }
//   for (let i = minDate; i < maxDate; i++) {
//     yearArr.push({
//       text: i + "年",
//       value: i,
//       children: monthLoop(i),
//     });
//   }
//   return yearArr
// };
/***
 * 根据月循环
 */

const monthLoop = (year) => {
  let month = [];
  for (let i = 1; i < 13; i++) {
    month.push({
      text: i + "月",
      value: i >9 ? i : '0' + i
    });
  }
  month.forEach((item, index) => {
    let date = new Date(year, index, 1);
    item.children = weekMethods(date);
  });
  return month
};
/** * 格式化时间为：yyyy-MM-dd HH:mm:ss * @param date * @returns {string} */
function jsDateFormatter (date,type) {
  var seperator1 = "-";
  var seperator2 = ":";
  var month = date.getMonth() + 1;
  var strDate = date.getDate();
  if (month >= 1 && month <= 9) {
    month = "0" + month;
  }
  if (strDate >= 0 && strDate <= 9) {
    strDate = "0" + strDate;
  }
  if(type == 'date'){
    var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate;
    return currentdate;
  }
  var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate + " " + date.getHours() + seperator2 + date.getMinutes()+ seperator2 + date.getSeconds();
  return currentdate;
}
function getDiffDay(date_1, date_2) {
  // 计算两个日期之间的差值
  let totalDays,diffDate
  let myDate_1 = Date.parse(date_1)
  let myDate_2 = Date.parse(date_2)
  // 将两个日期都转换为毫秒格式，然后做差
  diffDate = Math.abs(myDate_1 - myDate_2) // 取相差毫秒数的绝对值

  totalDays = Math.floor(diffDate / (1000 * 3600 * 24)) // 向下取整
  // console.log(totalDays)

  return totalDays    // 相差的天数
}

export const getWeekDays = (start,end) => {
  let arr = []
  let days = getDiffDay(start,end)
  let startDate = new Date(start)
  for (let i = 0; i <= days;i++) {
    let itemDate = new Date(startDate)
    itemDate.setDate(startDate.getDate()+(i));
    itemDate = new Date(itemDate)
    let weekDayName = getWeekdayName(itemDate.getDay(),itemDate)
    arr.push({
      day: itemDate.getDate(),
      weekday: itemDate.getDay(),
      weekdayName: weekDayName,
      date: itemDate,
      str: `${itemDate.getFullYear()}${itemDate.getMonth()}${itemDate.getDate()}`,
      isActive: weekDayName == '今日'
    })
  }
  return arr
}

export const getWeekdayName = (weekday,date) => {
  let current = new Date()
  let diff = getDiffDay(jsDateFormatter(date,'date'),jsDateFormatter(current,'date'))
  if(diff == 0)
    return '今日'
  switch (weekday) {
    case 1: return '一'
    case 2: return '二'
    case 3: return '三'
    case 4: return '四'
    case 5: return '五'
    case 6: return '六'
    case 0: return '日'
    default: return  '未知'
  }
}
export const getCurrentWeekByDate = (date) => {
  if(!date) date = (new Date()).toDateString()
  let dateObj = new Date(date)
  let weekIndex = dateObj.getDay()
  if(weekIndex == 0) weekIndex = 7
  let leftDayCount = weekIndex - 1;
  let rightDayCount = 7 - weekIndex;
  let leftDateList = []
  let rightDateList = []
  for (let i = leftDayCount;i>0;i--){
    let newDate = new Date(dateObj.toDateString())
    newDate = newDate.setDate(newDate.getDate() - i)
    newDate = new Date(newDate)
    leftDateList.push(newDate)
  }
  for (let i = 1;i<= rightDayCount;i++){
    let newDate = new Date(dateObj.toDateString())
    newDate = newDate.setDate(newDate.getDate() + i)
    newDate = new Date(newDate)
    rightDateList.push(newDate)
  }
  return [...leftDateList,dateObj,...rightDateList]
}

export const getDateFormatOfCN = (date) => {
  date = new Date(date)
  let year = date.getFullYear()
  let month = date.getMonth() + 1
  let day = date.getDate()
  return `${year}年${month}月${day}日`
}
export const  dateFormater = (formater, t)=>{
    let date = t ? new Date(t) : new Date(),
        Y = date.getFullYear() + '',
        M = date.getMonth() + 1,
        D = date.getDate(),
        H = date.getHours(),
        m = date.getMinutes(),
        s = date.getSeconds();
    return formater.replace(/YYYY|yyyy/g,Y)
        .replace(/YY|yy/g,Y.substring(2,2))
        .replace(/MM/g,(M<10?'0':'') + M)
        .replace(/DD/g,(D<10?'0':'') + D)
        .replace(/HH|hh/g,(H<10?'0':'') + H)
        .replace(/mm/g,(m<10?'0':'') + m)
        .replace(/ss/g,(s<10?'0':'') + s)
}