feat: project from excel

Signed-off-by: Pranav C <pranavxc@gmail.com>

packages/nc-gui/components/import/templateParsers/ExcelTemplateAdapter.js

@@ -0,0 +1,94 @@
+import XLSX from 'xlsx'
+import { UITypes } from '~/components/project/spreadsheet/helpers/uiTypes'
+import TemplateGenerator from '~/components/import/templateParsers/TemplateGenerator'
+
+const excelTypeToUidt = {
+  d: UITypes.DateTime,
+  b: UITypes.Checkbox,
+  n: UITypes.Number,
+  s: UITypes.SingleLineText
+}
+
+export default class ExcelTemplateAdapter extends TemplateGenerator {
+  constructor(name, ab) {
+    super()
+    this.name = name
+    this.excelData = ab
+    this.project = {
+      title: this.name,
+      tables: []
+    }
+    this.data = {}
+  }
+
+  async init() {
+    this.wb = XLSX.read(new Uint8Array(this.excelData), { type: 'array' })
+  }
+
+  parse() {
+    for (let i = 0; i < this.wb.SheetNames.length; i++) {
+      const sheet = this.wb.SheetNames[i]
+      const table = { tn: sheet, columns: [] }
+      this.data[sheet] = []
+      const ws = this.wb.Sheets[sheet]
+      const rows = XLSX.utils.sheet_to_json(ws, { header: 1 })
+
+      for (let col = 0; col < rows[0].length; col++) {
+        const column = {
+          cn: (rows[0][col] || `field${col + 1}`).replace(/\./, '_')
+        }
+
+        const cellProps = ws[`${col.toString(26).split('').map(s => (parseInt(s, 26) + 10).toString(36).toUpperCase())}2`] || {}
+
+        column.uidt = excelTypeToUidt[cellProps.t] || UITypes.SingleLineText
+
+        // todo: optimize
+        if (column.uidt === UITypes.SingleLineText) {
+          // check for long text
+          if (rows.some(r => (r[col] || '').toString().length > 255)) {
+            column.uidt = UITypes.LongText
+          } else {
+            const vals = rows.slice(1).map(r => r[col]).filter(v => v !== null && v !== undefined)
+
+            // check column is multi or single select by comparing unique values
+            if (vals.some(v => v && v.toString().includes(','))) {
+              const flattenedVals = vals.flatMap(v => v ? v.toString().split(',') : [])
+              const uniqueVals = new Set(flattenedVals)
+              if (flattenedVals.length > uniqueVals.size && uniqueVals.size <= flattenedVals.length / 10) {
+                column.uidt = UITypes.MultiSelect
+                column.dtxp = [...uniqueVals].join(',')
+              }
+            } else {
+              const uniqueVals = new Set(vals)
+              if (vals.length > uniqueVals.size && uniqueVals.size <= vals.length / 10) {
+                column.uidt = UITypes.SingleSelect
+                column.dtxp = [...uniqueVals].join(',')
+              }
+            }
+          }
+        }
+
+        table.columns.push(column)
+      }
+
+      for (const row of rows.slice(1)) {
+        const rowData = {}
+        for (let i = 0; i < table.columns.length; i++) {
+          // toto: do parsing if necessary based on type
+          rowData[table.columns[i].cn] = row[i]
+        }
+        this.data[sheet].push(rowData)
+      }
+
+      this.project.tables.push(table)
+    }
+  }
+
+  getTemplate() {
+    return this.project
+  }
+
+  getData() {
+    return this.data
+  }
+}