export default {
  data: () => ({
    viewStatus: {},
    showSystemFields: false,
    fieldFilter: '',
    filtersKey: 0,
    filters: [],
    sortList: [],
    showFields: {},
    // fieldList: [],
    // meta: {},
    data: []
  }),
  methods: {
    mapFieldsAndShowFields() {
      // this.fieldList = this.availableColumns.map(c => c._cn);
      this.showFields = this.fieldList.reduce((obj, k) => {
        obj[k] = k in this.showFields ? this.showFields[k] : true
        return obj
      }, {})
    },
    syncDataDebounce() {
      // not implemented
    },
    onKeyDown(e) {
      if (this.selected.col === null || this.selected.row === null) {
        return
      }
      switch (e.keyCode) {
        // left
        case 37:
          if (this.selected.col > 0) {
            this.selected.col--
          }
          break
        // right
        case 39:
          if (this.selected.col < this.colLength - 1) {
            this.selected.col++
          }
          break
        // up
        case 38:
          if (this.selected.row > 0) {
            this.selected.row--
          }
          break
        // down
        case 40:
          if (this.selected.row < this.rowLength - 1) {
            this.selected.row++
          }
          break
        // enter
        case 13:
          this.makeEditable(this.selected.col, this.selected.row)
          break
      }
    }
  },
  computed: {
    isLocked() {
      return this.viewStatus && this.viewStatus.type === 'locked'
    },
    fieldList() {
      return this.availableColumns.map((c) => {
        return c.alias
      })
    },
    realFieldList() {
      return this.availableRealColumns.map((c) => {
        return c._cn
      })
    },
    availableRealColumns() {
      return this.availableColumns && this.availableColumns.filter(c => !c.virtual)
    },
    availableColumns() {
      let columns = []

      // todo: generate hideCols based on default values
      const hideCols = ['created_at', 'updated_at']

      if (this.showSystemFields) {
        columns = this.meta.columns || []
      } else if (this.data && this.data.length) {
        columns = (this.meta.columns.filter(c => !(c.pk && c.ai) &&
          !((this.meta.v || []).some(v => v.bt && v.bt.cn === c.cn)) &&
          !hideCols.includes(c.cn))) || []
      } else {
        columns = (this.meta && this.meta.columns && this.meta.columns.filter(c => !(c.pk && c.ai) && !hideCols.includes(c.cn))) || []
      }

      if (this.meta && this.meta.v) {
        columns = [...columns, ...this.meta.v.map(v => ({ ...v, virtual: 1 }))]
      }

      {
        const _ref = {}
        columns.forEach((c) => {
          if (c.virtual && c.lookup) {
            c.alias = `${c._cn} (from ${c._tn})`
          } else {
            c.alias = c._cn
          }
          if (c.alias in _ref) {
            c.alias += _ref[c.alias]++
          } else {
            _ref[c.alias] = 1
          }
        })
      }
      if (this.fieldsOrder.length) {
        return [...columns].sort((c1, c2) => {
          const i1 = this.fieldsOrder.indexOf(c1.alias)
          const i2 = this.fieldsOrder.indexOf(c2.alias)
          return (i1 === -1 ? Infinity : i1) - (i2 === -1 ? Infinity : i2)
        })
      }

      return columns
    },
    concatenatedXWhere() {
      let where = ''
      if (this.searchField && this.searchQuery.trim()) {
        if (['text', 'string'].includes(this.sqlUi.getAbstractType(this.availableColumns.find(({ _cn }) => _cn === this.searchField) || this.availableColumns[0]))) {
          where = `(${this.searchField},like,%${this.searchQuery.trim()}%)`
        } else {
          where = `(${this.searchField},eq,${this.searchQuery.trim()})`
        }
      }

      if (!where) {
        return this.xWhere
      }

      return this.xWhere ? where + `~and(${this.xWhere})` : where
    },
    nestedAndRollupColumnParams() {
      // generate params for nested columns
      const nestedFields = ((this.meta && this.meta.v && this.meta.v) || []).reduce((obj, vc) => {
        if (vc.hm) {
          obj.hm.push(vc.hm.tn)
        } else if (vc.bt) {
          obj.bt.push(vc.bt.rtn)
        } else if (vc.mm) {
          obj.mm.push(vc.mm.rtn)
        }
        return obj
      }, { hm: [], bt: [], mm: [] })

      // todo: handle if virtual column missing
      // construct fields args based on lookup columns
      const fieldsObj = ((this.meta && this.meta.v && this.meta.v) || []).reduce((obj, vc) => {
        if (!vc.lookup) {
          return obj
        }

        let key
        let index
        let column

        switch (vc.type) {
          case 'mm':
            index = nestedFields.mm.indexOf(vc.tn) + 1
            key = `mfields${index}`
            column = vc.cn
            break
          case 'hm':
            index = nestedFields.hm.indexOf(vc.tn) + 1
            key = `hfields${index}`
            column = vc.cn
            break
          case 'bt':
            index = nestedFields.bt.indexOf(vc.tn) + 1
            key = `bfields${index}`
            column = vc.cn
            break
        }

        if (index && column) {
          obj[key] = `${obj[key] ? `${obj[key]},` : ''}${column}`
        }

        return obj
      }, {})
      return {
        ...Object.entries(nestedFields).reduce((ro, [k, a]) => ({ ...ro, [k]: a.join(',') }), {}),
        ...fieldsObj
      }
    },
    queryParams() {
      return {
        limit: this.size,
        offset: this.size * (this.page - 1),
        // condition: this.condition,
        where: this.concatenatedXWhere,
        sort: this.sort,
        ...this.nestedAndRollupColumnParams
        // ...Object.entries(nestedFields).reduce((ro, [k, a]) => ({ ...ro, [k]: a.join(',') })),
        // ...fieldsObj
      }
    },
    colLength() {
      return (this.availableColumns && this.availableColumns.length) || 0
    },
    visibleColLength() {
      return (this.availableColumns && this.availableColumns.length) || 0
    },
    rowLength() {
      return (this.data && this.data.length) || 0
    },
    edited() {
      return this.data && this.data.some(r => r.rowMeta && (r.rowMeta.new || r.rowMeta.changed))
    },
    hasMany() {
      // todo: use cn alias
      return this.meta && this.meta.hasMany
        ? this.meta.hasMany.reduce((hm, o) => {
          const _rcn = this.meta.columns.find(c => c.cn === o.rcn)._cn
          hm[_rcn] = hm[_rcn] || []
          hm[_rcn].push(o)
          return hm
        }, {})
        : {}
    },
    haveHasManyrelation() {
      return !!Object.keys(this.hasMany).length
    },
    belongsTo() {
      return this.meta && this.meta.belongsTo
        ? this.meta.belongsTo.reduce((bt, o) => {
          const _cn = (this.meta.columns.find(c => c.cn === o.cn) || {})._cn
          bt[_cn] = o
          return bt
        }, {})
        : {}
    },
    table() {
      if (this.relationType === 'hm') {
        return this.relation.tn
      } else if (this.relationType === 'bt') {
        return this.relation.rtn
      }

      return this.nodes.tn || this.nodes.view_name
    },
    primaryValueColumn() {
      if (!this.meta || !this.availableColumns || !this.availableColumns.length) {
        return ''
      }
      return (this.availableColumns.find(col => col.pv) || { _cn: '' })._cn
    }
  },
  watch: {
    'viewStatus.type'() {
      if (!this.loadingMeta || !this.loadingData) {
        this.syncDataDebounce(this)
      }
    },
    showFields: {
      handler(v) {
        if (!this.loadingMeta || !this.loadingData) {
          this.syncDataDebounce(this)
        }
      },
      deep: true
    },
    fieldsOrder: {
      handler(v) {
        if (!this.loadingMeta || !this.loadingData) {
          this.syncDataDebounce(this)
        }
      },
      deep: true
    },
    filters: {
      async handler(filter) {
        let defaultQuery = ''
        let j = 0
        const xWhere = filter.reduce((condition, filt, k) => {
          if (filt.readOnly) {
            defaultQuery += `(${filt.field},eq,${filt.value})`
            j++
            return condition
          }
          const i = k - j

          if (i && !filt.logicOp) {
            return condition
          }
          if (!(filt.field && filt.op)) {
            return condition
          }

          condition += (i ? `~${filt.logicOp}` : '')
          switch (filt.op) {
            case 'is equal':
              return condition + `(${filt.field},eq,${filt.value})`
            case 'is not equal':
              return condition + `~not(${filt.field},eq,${filt.value})`
            case 'is like':
              return condition + `(${filt.field},like,%${filt.value}%)`
            case 'is not like':
              return condition + `~not(${filt.field},like,%${filt.value}%)`
            case 'is empty':
              return condition + `(${filt.field},in,)`
            case 'is not empty':
              return condition + `~not(${filt.field},in,)`
            case 'is null':
              return condition + `(${filt.field},is,null)`
            case 'is not null':
              return condition + `~not(${filt.field},is,null)`
            case '<':
              return condition + `(${filt.field},lt,${filt.value})`
            case '<=':
              return condition + `(${filt.field},le,${filt.value})`
            case '>':
              return condition + `(${filt.field},gt,${filt.value})`
            case '>=':
              return condition + `(${filt.field},ge,${filt.value})`
          }
          return condition
        }, '')

        this.xWhere = defaultQuery ? defaultQuery + (xWhere ? `~and(${xWhere})` : xWhere) : xWhere

        // if (!this.progress) {
        //   await this.loadTableData();
        // }
        if (!this.loadingMeta || !this.loadingData) {
          this.syncDataDebounce(this)
        }
      },
      deep: true
    },
    sortList: {
      async handler(sortList) {
        const sort = sortList.map((sort) => {
          return sort.field ? `${sort.order}${sort.field}` : ''
        }).filter(Boolean).join(',')
        this.sort = sort
        // if (!this.progress) {
        //   await this.loadTableData();
        // }
        if (!this.loadingMeta || !this.loadingData) {
          this.syncDataDebounce(this)
        }
      },
      deep: true
    },
    columnsWidth() {
      if (!this.loadingMeta || !this.loadingData) {
        this.syncDataDebounce(this)
      }
    },
    sort(n, o) {
      if (o !== n) {
        this.loadTableData()
      }
    },
    concatenatedXWhere(n, o) {
      if (o !== n) {
        this.loadTableData()
      }
    }
  }
}