<template>
    <div class="app-container">
      <div class="filter-container">

        <el-input
          v-model="listQuery.title"
          :placeholder="$t('table.title')"
          style="width: 200px;"
          class="filter-item"
          @keyup.enter.native="handleFilter"
        />
        <el-select
          v-model="listQuery.importance"
          :placeholder="$t('table.importance')"
          clearable
          style="width: 90px"
          class="filter-item"
        >
          <el-option
            v-for="item in importanceOptions"
            :key="item"
            :label="item"
            :value="item"
          />

        </el-select>

        <el-select
          v-model="listQuery.type"
          :placeholder="$t('table.type')"
          clearable
          class="filter-item"
          style="width: 130px"
        >
          <el-option
            v-for="item in calendarTypeOptions"
            :key="item.key"
            :label="item.display_name+'('+item.key+')'"
            :value="item.key"
          />

        </el-select>

        <el-select
          v-model="listQuery.sort"
          style="width: 140px"
          class="filter-item"
          @change="handleFilter"
        >
          <el-option
            v-for="item in sortOptions"
            :key="item.key"
            :label="item.label"
            :value="item.key"
          />

        </el-select>

        <el-button
          v-waves
          class="filter-item"
          type="primary"
          icon="el-icon-search"
          @click="handleFilter"
        >

          {{ $t('table.search') }}
        </el-button>

        <el-button
          class="filter-item"
          style="margin-left: 10px;"
          type="primary"
          icon="el-icon-edit"
          @click="handleCreate"
        >

          {{ $t('table.add') }}
        </el-button>

        <el-button
          v-waves
          :loading="downloadLoading"
          class="filter-item"
          type="primary"
          icon="el-icon-download"
          @click="handleDownload"
        >

          {{ $t('table.export') }}
        </el-button>

        <el-checkbox
          v-model="showReviewer"
          class="filter-item"
          style="margin-left:15px;"
          @change="tableKey=tableKey+1"
        >

          {{ $t('table.reviewer') }}
        </el-checkbox>
      </div>
  
      <el-table
        :key="tableKey"
        v-loading="listLoading"
        :data="list"
        border
        fit
        highlight-current-row
        style="width: 100%;"
        @sort-change="sortChange"
      >

        <el-table-column
          :label="$t('table.id')"
          prop="id"
          sortable="custom"
          align="center"
          width="80"
          :class-name="getSortClass('id')"
        >

          <template slot-scope="{row}">
            <span>{{ row.id }}</span>
          </template>
        </el-table-column>

        <el-table-column
          :label="$t('table.date')"
          width="150px"
          align="center"
        >

          <template slot-scope="{row}">
            <span>{{ row.timestamp | parseTime('{y}-{m}-{d} {h}:{i}') }}</span>
          </template>
        </el-table-column>

        <el-table-column
          :label="$t('table.title')"
          min-width="150px"
        >

          <template slot-scope="{row}">

            <span
              class="link-type"
              @click="handleUpdate(row)"
            >{{ row.title }}</span>

            <el-tag>{{ row.type | typeFilter }}</el-tag>
          </template>
        </el-table-column>

        <el-table-column
          :label="$t('table.author')"
          width="110px"
          align="center"
        >

          <template slot-scope="{row}">
            <span>{{ row.author }}</span>
          </template>
        </el-table-column>

        <el-table-column
          v-if="showReviewer"
          :label="$t('table.reviewer')"
          width="110px"
          align="center"
        >

          <template slot-scope="{row}">
            <span style="color:red;">{{ row.reviewer }}</span>
          </template>
        </el-table-column>

        <el-table-column
          :label="$t('table.importance')"
          width="80px"
        >

          <template slot-scope="{row}">

            <svg-icon
              v-for="n in +row.importance"
              :key="n"
              icon-class="star"
              class="meta-item__icon"
            />

          </template>
        </el-table-column>

        <el-table-column
          :label="$t('table.readings')"
          align="center"
          width="95"
        >

          <template slot-scope="{row}">

            <span
              v-if="row.pageviews"
              class="link-type"
              @click="handleFetchPv(row.pageviews)"
            >{{ row.pageviews }}</span>

            <span v-else>0</span>
          </template>
        </el-table-column>

        <el-table-column
          :label="$t('table.status')"
          class-name="status-col"
          width="100"
        >

          <template slot-scope="{row}">
            <el-tag :type="row.status | statusFilter">
              {{ row.status }}
            </el-tag>
          </template>
        </el-table-column>

        <el-table-column
          :label="$t('table.actions')"
          align="center"
          width="230"
          class-name="small-padding fixed-width"
        >

          <template slot-scope="{row,$index}">

            <el-button
              type="primary"
              size="mini"
              @click="handleUpdate(row)"
            >

              {{ $t('table.edit') }}
            </el-button>

            <el-button
              v-if="row.status!='published'"
              size="mini"
              type="success"
              @click="handleModifyStatus(row,'published')"
            >

              {{ $t('table.publish') }}
            </el-button>

            <el-button
              v-if="row.status!='draft'"
              size="mini"
              @click="handleModifyStatus(row,'draft')"
            >

              {{ $t('table.draft') }}
            </el-button>

            <el-button
              v-if="row.status!='deleted'"
              size="mini"
              type="danger"
              @click="handleDelete(row,$index)"
            >

              {{ $t('table.delete') }}
            </el-button>
          </template>
        </el-table-column>
      </el-table>

      <pagination
        v-show="total>0"
        :total="total"
        :page.sync="listQuery.page"
        :limit.sync="listQuery.limit"
        @pagination="getList"
      />

      <el-dialog
        :title="textMap[dialogStatus]"
        :visible.sync="dialogFormVisible"
      >
        <el-form
          ref="dataForm"
          :rules="rules"
          :model="temp"
          label-position="left"
          label-width="70px"
          style="width: 400px; margin-left:50px;"
        >
          <el-form-item
            :label="$t('table.type')"
            prop="type"
          >
            <el-select
              v-model="temp.type"
              class="filter-item"
              placeholder="Please select"
            >
              <el-option
                v-for="item in calendarTypeOptions"
                :key="item.key"
                :label="item.display_name"
                :value="item.key"
              />

            </el-select>
          </el-form-item>

          <el-form-item
            :label="$t('table.date')"
            prop="timestamp"
          >
            <el-date-picker
              v-model="temp.timestamp"
              type="datetime"
              placeholder="Please pick a date"
            />

          </el-form-item>

          <el-form-item
            :label="$t('table.title')"
            prop="title"
          >

            <el-input v-model="temp.title" />
          </el-form-item>
          <el-form-item :label="$t('table.status')">

            <el-select
              v-model="temp.status"
              class="filter-item"
              placeholder="Please select"
            >
              <el-option
                v-for="item in statusOptions"
                :key="item"
                :label="item"
                :value="item"
              />

            </el-select>
          </el-form-item>
          <el-form-item :label="$t('table.importance')">

            <el-rate
              v-model="temp.importance"
              :colors="['#99A9BF', '#F7BA2A', '#FF9900']"
              :max="3"
              style="margin-top:8px;"
            />

          </el-form-item>
          <el-form-item :label="$t('table.remark')">

            <el-input
              v-model="temp.remark"
              :autosize="{ minRows: 2, maxRows: 4}"
              type="textarea"
              placeholder="Please input"
            />

          </el-form-item>
        </el-form>

        <div
          slot="footer"
          class="dialog-footer"
        >

          <el-button @click="dialogFormVisible = false">
            {{ $t('table.cancel') }}
          </el-button>

          <el-button
            type="primary"
            @click="dialogStatus==='create'?createData():updateData()"
          >

            {{ $t('table.confirm') }}
          </el-button>
        </div>
      </el-dialog>

      <el-dialog
        :visible.sync="dialogPvVisible"
        title="Reading statistics"
      >
        <el-table
          :data="pvData"
          border
          fit
          highlight-current-row
          style="width: 100%"
        >
          <el-table-column
            prop="key"
            label="Channel"
          />
          <el-table-column
            prop="pv"
            label="Pv"
          />

        </el-table>

        <span
          slot="footer"
          class="dialog-footer"
        >
          <el-button
            type="primary"
            @click="dialogPvVisible = false"
          >{{ $t('table.confirm') }}</el-button>

        </span>
      </el-dialog>
    </div>
  </template>
  
  <script>

  import {
    fetchList,
    fetchPv,
    createArticle,
    updateArticle
  } from '@/api/article'

  import waves from '@/directive/waves' // waves directive
  import { parseTime } from '@/utils'
  import Pagination from '@/components/Pagination' // secondary package based on el-pagination
  
  const calendarTypeOptions = [
    { key: 'CN', display_name: 'China' },
    { key: 'US', display_name: 'USA' },
    { key: 'JP', display_name: 'Japan' },
    { key: 'EU', display_name: 'Eurozone' }
  ]
  
  // arr to obj, such as { CN : "China", US : "USA" }
  const calendarTypeKeyValue = calendarTypeOptions.reduce((acc, cur) => {
    acc[cur.key] = cur.display_name
    return acc
  }, {})
  
  export default {
    name: 'ComplexTable',
    components: { Pagination },
    directives: { waves },
    filters: {
      statusFilter(status) {
        const statusMap = {
          published: 'success',
          draft: 'info',
          deleted: 'danger'
        }
        return statusMap[status]
      },
      typeFilter(type) {
        return calendarTypeKeyValue[type]
      }
    },
    data() {
      return {
        tableKey: 0,
        list: null,
        total: 0,
        listLoading: true,
        listQuery: {
          page: 1,
          limit: 20,
          importance: undefined,
          title: undefined,
          type: undefined,
          sort: '+id'
        },
        importanceOptions: [1, 2, 3],
        calendarTypeOptions,

        sortOptions: [
          { label: 'ID Ascending', key: '+id' },
          { label: 'ID Descending', key: '-id' }
        ],

        statusOptions: ['published', 'draft', 'deleted'],
        showReviewer: false,
        temp: {
          id: undefined,
          importance: 1,
          remark: '',
          timestamp: new Date(),
          title: '',
          type: '',
          status: 'published'
        },
        dialogFormVisible: false,
        dialogStatus: '',
        textMap: {
          update: 'Edit',
          create: 'Create'
        },
        dialogPvVisible: false,
        pvData: [],
        rules: {

          type: [
            { required: true, message: 'type is required', trigger: 'change' }
          ],
          timestamp: [
            {
              type: 'date',
              required: true,
              message: 'timestamp is required',
              trigger: 'change'
            }
          ],
          title: [
            { required: true, message: 'title is required', trigger: 'blur' }
          ]

        },
        downloadLoading: false
      }
    },
    created() {
      this.getList()
    },
    methods: {
      getList() {
        this.listLoading = true
        fetchList(this.listQuery).then(response => {
          this.list = response.data.items
          this.total = response.data.total
  
          // Just to simulate the time of the request
          setTimeout(() => {
            this.listLoading = false
          }, 1.5 * 1000)
        })
      },
      handleFilter() {
        this.listQuery.page = 1
        this.getList()
      },
      handleModifyStatus(row, status) {
        this.$message({
          message: '操作成功',
          type: 'success'
        })
        row.status = status
      },
      sortChange(data) {
        const { prop, order } = data
        if (prop === 'id') {
          this.sortByID(order)
        }
      },
      sortByID(order) {
        if (order === 'ascending') {
          this.listQuery.sort = '+id'
        } else {
          this.listQuery.sort = '-id'
        }
        this.handleFilter()
      },
      resetTemp() {
        this.temp = {
          id: undefined,
          importance: 1,
          remark: '',
          timestamp: new Date(),
          title: '',
          status: 'published',
          type: ''
        }
      },
      handleCreate() {
        this.resetTemp()
        this.dialogStatus = 'create'
        this.dialogFormVisible = true
        this.$nextTick(() => {
          this.$refs['dataForm'].clearValidate()
        })
      },
      createData() {

        this.$refs['dataForm'].validate(valid => {

          if (valid) {
            this.temp.id = parseInt(Math.random() * 100) + 1024 // mock a id

            this.temp.author = '秀野堂主'

            createArticle(this.temp).then(() => {
              this.list.unshift(this.temp)
              this.dialogFormVisible = false
              this.$notify({
                title: '成功',
                message: '创建成功',
                type: 'success',
                duration: 2000
              })
            })
          }
        })
      },
      handleUpdate(row) {
        this.temp = Object.assign({}, row) // copy obj
        this.temp.timestamp = new Date(this.temp.timestamp)
        this.dialogStatus = 'update'
        this.dialogFormVisible = true
        this.$nextTick(() => {
          this.$refs['dataForm'].clearValidate()
        })
      },
      updateData() {

        this.$refs['dataForm'].validate(valid => {

          if (valid) {
            const tempData = Object.assign({}, this.temp)
            tempData.timestamp = +new Date(tempData.timestamp) // change Thu Nov 30 2017 16:41:05 GMT+0800 (CST) to 1512031311464
            updateArticle(tempData).then(() => {
              const index = this.list.findIndex(v => v.id === this.temp.id)
              this.list.splice(index, 1, this.temp)
              this.dialogFormVisible = false
              this.$notify({
                title: '成功',
                message: '更新成功',
                type: 'success',
                duration: 2000
              })
            })
          }
        })
      },
      handleDelete(row, index) {
        this.$notify({
          title: '成功',
          message: '删除成功',
          type: 'success',
          duration: 2000
        })
        this.list.splice(index, 1)
      },
      handleFetchPv(pv) {
        fetchPv(pv).then(response => {
          this.pvData = response.data.pvData
          this.dialogPvVisible = true
        })
      },
      handleDownload() {
        this.downloadLoading = true
        import('@/vendor/Export2Excel').then(excel => {
          const tHeader = ['timestamp', 'title', 'type', 'importance', 'status']

          const filterVal = [
            'timestamp',
            'title',
            'type',
            'importance',
            'status'
          ]

          const data = this.formatJson(filterVal)
          excel.export_json_to_excel({
            header: tHeader,
            data,
            filename: 'table-list'
          })
          this.downloadLoading = false
        })
      },
      formatJson(filterVal) {

        return this.list.map(v =>
          filterVal.map(j => {
            if (j === 'timestamp') {
              return parseTime(v[j])
            } else {
              return v[j]
            }
          })
        )

      },
      getSortClass: function(key) {
        const sort = this.listQuery.sort
        return sort === `+${key}` ? 'ascending' : 'descending'
      }
    }
  }
  </script>