<template>
  <a-skeleton active :loading="loading" :paragraph="{rows: 17}">
    <a-card>
      <!-- Redis 信息实时监控 -->
      <a-row :gutter="8">
        <a-col :sm="24" :xl="12">
          <area-chart-ty v-bind="memory"/>
        </a-col>
        <a-col :sm="24" :xl="12">
          <area-chart-ty v-bind="key"/>
        </a-col>
      </a-row>

      <h3>Redis 详细信息</h3>
      <a-table
        :loading="tableLoading"
        :columns="columns"
        :dataSource="redisInfo"
        :pagination="false"/>

    </a-card>
  </a-skeleton>
</template>
<script>
import moment from 'moment'
import {getAction} from '@/api/manage'
import AreaChartTy from '@/components/chart/AreaChartTy'

export default {
  name: 'RedisInfo',
  components: {
    AreaChartTy
  },
  data() {
    return {
      loading: true,
      tableLoading: true,
      // 定时器ID
      timer: null,
      // 定时器周期
      millisec: 3000,
      // Key 实时数量
      key: {
        title: 'Redis Key 实时数量（个）',
        dataSource: [],
        y: '数量（个）',
        height: 340,
        min: 0,
        max: 100,
        color: '#FF6987',
        lineSize: 8,
        lineColor: '#DC143C'
      },
      // 内存实时占用情况
      memory: {
        title: 'Redis 内存实时占用情况（KB）',
        dataSource: [],
        y: '内存（KB）',
        min: 0,
        max: 3000,
        height: 340,
        lineSize: 8
      },
      redisInfo: [],
      columns: [{
        title: 'Key',
        align: 'center',
        dataIndex: 'key'
      }, {
        title: 'Description',
        align: 'left',
        dataIndex: 'description'
      }, {
        title: 'Value',
        align: 'center',
        dataIndex: 'value'
      }],
      url: {
        keysSize: '/sys/actuator/redis/keysSize',
        memoryInfo: '/sys/actuator/redis/memoryInfo',
        info: '/sys/actuator/redis/info'
      },
      path: '/monitor/redis/info'
    }
  },
  mounted() {
    this.openTimer()
    this.loadRedisInfo()
    setTimeout(() => {
      this.loadData()
    }, 1000)
  },
  beforeDestroy() {
    this.closeTimer()
  },
  methods: {

    /** 开启定时器 */
    openTimer() {
      this.loadData()
      this.closeTimer()
      this.timer = setInterval(() => {
        if (this.$route.path === this.path) {
          this.loadData()
        }
      }, this.millisec)
    },

    /** 关闭定时器 */
    closeTimer() {
      if (this.timer) clearInterval(this.timer)
    },

    /** 查询数据 */
    loadData() {
      Promise.all([
        getAction(this.url.keysSize),
        getAction(this.url.memoryInfo)
      ]).then((res) => {
        let time = moment().format('hh:mm:ss')

        let [{dbSize: currentSize}, memoryInfo] = res
        let currentMemory = memoryInfo.used_memory / 1000

        // push 数据
        this.key.dataSource.push({x: time, y: currentSize})
        this.memory.dataSource.push({x: time, y: currentMemory})
        // 最大长度为6
        if (this.key.dataSource.length > 6) {
          this.key.dataSource.splice(0, 1)
          this.memory.dataSource.splice(0, 1)
        }

        // 计算 Key 最大最小值
        let keyPole = this.getMaxAndMin(this.key.dataSource, 'y')
        this.key.max = Math.floor(keyPole[0]) + 10
        this.key.min = Math.floor(keyPole[1]) - 10
        if (this.key.min < 0) this.key.min = 0

        // 计算 Memory 最大最小值
        let memoryPole = this.getMaxAndMin(this.memory.dataSource, 'y')
        this.memory.max = Math.floor(memoryPole[0]) + 100
        this.memory.min = Math.floor(memoryPole[1]) - 100
        if (this.memory.min < 0) this.memory.min = 0

      }).catch((e) => {
        console.error(e)
        this.closeTimer()
        this.$message.error('获取 Redis 信息失败')
      }).finally(() => {
        this.loading = false
      })

    },

    // 获取一组数据中最大和最小的值
    getMaxAndMin(dataSource, field) {
      let maxValue = null, minValue = null
      dataSource.forEach(item => {
        let value = Number.parseInt(item[field])
        // max
        if (maxValue == null) {
          maxValue = value
        } else if (value > maxValue) {
          maxValue = value
        }
        // min
        if (minValue == null) {
          minValue = value
        } else if (value < minValue) {
          minValue = value
        }
      })
      return [maxValue, minValue]
    },

    loadRedisInfo() {
      this.tableLoading = true
      getAction(this.url.info).then((res) => {
        this.redisInfo = res.result
      }).finally(() => {
        this.tableLoading = false
      })
    }

  }
}
</script>
<style></style>