<template>
  <div class="mpvue-picker">
    <div :class="{'pickerMask':showPicker}" @click="maskClick" catchtouchmove="true"></div>
    <div class="mpvue-picker-content " :class="{'mpvue-picker-view-show':showPicker}">
      <div class="mpvue-picker__hd" catchtouchmove="true">
        <div class="mpvue-picker__action" @click="pickerCancel">取消</div>
        <div class="mpvue-picker__action" :style="{color:themeColor}" @click="pickerConfirm">确定</div>
      </div>
      <picker-view indicator-style="height: 40px;" class="mpvue-picker-view" :value="pickerValue" @change="pickerChange">
        <block>
			<picker-view-column>
			    <view class="picker-item" v-for="(item,index) in years" :key="index">{{item.label}}年</view>
			</picker-view-column>
			<picker-view-column>
			    <view class="picker-item" v-for="(item,index) in months" :key="index">{{item.label}}月</view>
			</picker-view-column>
			<picker-view-column>
			    <view class="picker-item" v-for="(item,index) in days" :key="index">{{item.label}}日</view>
			</picker-view-column>
        </block>
      </picker-view>
    </div>
  </div>
</template>

<script>
//import provinceData from './city-data/province.js';
//import cityData from './city-data/city.js';
//import areaData from './city-data/area.js';

var addMonth=function(date, months) {
	let y = date.getFullYear();
	let m = date.getMonth();
	var d = date.getDate();

//		console.log('add month y' + y + ' m:' + m + ' d: ' + d + ' month: ' + months);
	y += Math.floor((m + 1 + months) / 12); //计算年
	m = Math.floor((m + 1 + months) % 12) - 1; //计算月
	let _date = new Date(y,m,d);
//		console.log('result y:' + y + ' m: ' + m + '_date:' + _date);
	return _date;
};
var addDay=function(date, days) {
	var _date = new Date(date.getTime() + 24*60*60*1000*days) 
	return _date;
};
export default {
  data() {
	  const date = new Date()
	  const years = []
	  const year = date.getFullYear()
	  const months = []
	  const month = date.getMonth() + 1
	  const days = []
	  const day = date.getDate()
	  
	  let index = 0;
	  for (let i = 1990; i <= date.getFullYear(); i++) {
		  let data = { value: index++,label:i};
	      years.push(data)
	  }
	  index = 0;
	  for (let i = 1; i <= 12; i++) {
		  let data = { value: index++,label:i};
	      months.push(data)
	  }
	  index = 0;
	  for (let i = 1; i <= 31; i++) {
		  let data = { value: index++,label:i};
	      days.push(data)
	  }
    return { 
      pickerValue: [0, 0, 0],
		 years,
		 year,
		 months,
		 month,
		 days,
		 day,
		/* 是否显示控件 */
		showPicker: false,
    };
  },
  created() {
//	console.log('mpvueCityPicker created')
	 
    this.init()
  },
  props: {
    /* 默认值 */
    pickerValueDefault: {
      type: Array,
      default(){
				return [0, 0 , 0]
			}
    },
    /* 主题色 */
    themeColor: String
  },
	watch:{
		pickerValueDefault(){
			this.init();
		}
	},
  methods: {
		init() {
//			console.log('mpvueCityPicker init')
			if(this.pickerValueDefault.length == 0)
				this.pickerValueDefault  = [0,0, 0];
			 
			//console.log('ageDownLimit'+JSON.stringify(this.ageDownLimitDataList))
			//console.log('ageUpLimit'+JSON.stringify(this.ageUpLimitDataList))
			//this.handPickValueDefault(); // 对 pickerValueDefault 做兼容处理
			
			 
			this.pickerValue = this.pickerValueDefault;
		},
    show() {
      setTimeout(() => {
        this.showPicker = true;
      }, 0);
    },
    maskClick() {
      this.pickerCancel();
    },
    pickerCancel() {
      this.showPicker = false;
      this._$emit('onCancel');
    },
    pickerConfirm(e) {
      this.showPicker = false;
      this._$emit('onConfirm');
    },
    showPickerView() {
      this.showPicker = true;
    },
    handPickValueDefault() {
	
      //console.log('mpvueCityPicker handPickValueDefault')
	  console.log('默认树'+JSON.stringify(this.pickerValueDefault))
	  //console.log('省'+JSON.stringify(this.pickerValueDefault))
	  	  
       
        if (this.pickerValueDefault[0] > this.years.length - 1) {
          this.pickerValueDefault[0] = this.years.length - 1;
		   
        } 	
		if (this.pickerValueDefault[1] > this.months.length - 1) {
		  this.pickerValueDefault[1] = this.months.length - 1;
		   
		} 
		if (this.pickerValueDefault[2] > this.days.length - 1) {
		  this.pickerValueDefault[2] = this.days.length - 1;		   
		} 
    },
    pickerChange(e) {
      let changePickerValue = e.mp.detail.value;
      if (this.pickerValue[0] !== changePickerValue[0]) {
        // 第一级发生滚动   
		 
		//this.cityDataList = cityData[changePickerValue[0]];
        //this.areaDataList = areaData[changePickerValue[0]][0];
        changePickerValue[1] = 0; 
		console.log('第一级滚动')
        console.log('date'+JSON.stringify(this.years[changePickerValue[0]]) +'-'+JSON.stringify(this.months[changePickerValue[1]]))
      } 
	  else if (this.pickerValue[1] !== changePickerValue[1]) {
        // 第二级滚动
		console.log('第二级滚动')
		let year = this.years[changePickerValue[0]].label;
		let month = this.months[changePickerValue[1]].label; 
        console.log('date'+JSON.stringify(this.years[changePickerValue[0]]) +'-'+JSON.stringify(this.months[changePickerValue[1]]))
		let date = new Date(year,month-1,1);
		let nextMonth = addMonth(date,1);
		let currentMonth = addDay(nextMonth,-1);
		
		console.log('下月日期'+JSON.stringify(nextMonth))
		console.log('当前日期'+JSON.stringify(currentMonth))
		const day = currentMonth.getDate()
		console.log('day'+JSON.stringify(day))
		let index = 0;
		this.days =[];
		for (let i = 1; i <= day; i++) {
				  let data = { value: index++,label:i};
		    this.days.push(data)
		}
        changePickerValue[2] = 0;
      } 
      this.pickerValue = changePickerValue;
      this._$emit('onChange');
    },
    _$emit(emitName) {
      let pickObj = {
        label: this._getLabel(),
        value: this.pickerValue
      };
      this.$emit(emitName, pickObj);
    },
    _getLabel() {
      let pcikerLabel = 
        this.years[this.pickerValue[0]].label +
        '-' +
        this.months[this.pickerValue[1]].label+
		'-'+
		this.days[this.pickerValue[2]].label;
      return pcikerLabel;
    } 
  }
};
</script>

<style>
.pickerMask {
  position: fixed;
  z-index: 1000;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
}
.mpvue-picker-content {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  transition: all 0.3s ease;
  transform: translateY(100%);
  z-index: 3000;
}
.mpvue-picker-view-show {
  transform: translateY(0);
}
.mpvue-picker__hd {
  display: flex;
  padding: 9px 15px;
  background-color: #fff;
  position: relative;
  text-align: center;
  font-size: 17px;
}
.mpvue-picker__hd:after {
  content: ' ';
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  height: 1px;
  border-bottom: 1px solid #e5e5e5;
  color: #e5e5e5;
  transform-origin: 0 100%;
  transform: scaleY(0.5);
}
.mpvue-picker__action {
  display: block;
  flex: 1;
  color: #1aad19;
}
.mpvue-picker__action:first-child {
  text-align: left;
  color: #888;
}
.mpvue-picker__action:last-child {
  text-align: right;
}
.picker-item {
  text-align: center;
  line-height: 40px;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 16px;
}
.mpvue-picker-view {
  position: relative;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 238px;
  background-color: rgba(255, 255, 255, 1);
}
</style>
