// 判断当前月份的总天数
const thisMonthLenth = (year, month) => {
  let len
  if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
    len = 31
  } else if (month == 4 || month == 6 || month == 9 || month == 11) {
    len = 30
  } else if (month == 2) {
    if (((year % 4) == 0) && ((year % 100) != 0) || ((year % 400) == 0)) {
      len = 29
    } else {
      len = 28
    }
  }
  return len
}

// 获取最小的日期
const startDate = res => {
  if (res.length > 0) {
    let date = res[0]
    for (let i in res) {
      date = new Date(res[i]['date'].replace(/\-/g, "/")) < new Date(date['date'].replace(/\-/g, "/")) ? res[i] : date
    }
    return date
  }
}

// 判断是否是最大的日期
const isMaxDate = (date, data) => {
  let isSame = false
  let index = null
  if (data.length > 0) {
    for (let i in data) {
      if (new Date(date.replace(/\-/g, "/")).getTime() >= new Date(data[i]['date'].replace(/\-/g, "/")).getTime()) {
        isSame = true
        index = i
        break
      }
    }
  }
  return { isSame, index }
}

// 判断是否是相同的星期
const isSameWeek = (week, data) => {
  let isSame = false
  let index = null
  if (data.length > 0) {
    for (let i in data) {
      if (data[i]['week'] == week) {
        isSame = true
        index = i
        break
      }
    }
  }
  return { isSame, index }
}

// 判断是否是相同的星期 并且 传参日期要大于 当下日期
const isSameWeekTwo = (week, date, data) => {
  let isSame = false
  let index = null
  if (data.length > 0) {
    for (let i in data) {
      if (data[i]['week'] == week && new Date(date.replace(/\-/g, "/")).getTime() >= new Date(data[i]['date'].replace(/\-/g, "/")).getTime()) {
        isSame = true
        index = i
        break
      }
    }
  }
  return { isSame, index }
}

// 判断是否是相同的一天
const isSameDate = (date, data) => {
  let isSame = false
  let index = null
  if (data.length > 0) {
    for (let i in data) {
      if (data[i]['date'] == date) {
        isSame = true
        index = i
        break
      }
    }
  }
  return { isSame, index }
}

module.exports = {
  thisMonthLenth,
  startDate,
  isMaxDate,
  isSameWeek,
  isSameWeekTwo,
  isSameDate
}