del db2 with pr

pos-frontend/__test__/db.test.jsx

@@ -1,22 +0,0 @@
-import '@testing-library/jest-dom'
-import pl from 'nodejs-polars'
-import { test_x, create_csv_database, add_row, print_head, delete_row_by_key, save_db } from '../app/database'
-
-describe('DATABASE', () => {
-  it('DATA', () => {
-    test_x()
-  })
-
-  it('create csv', () => {
-    let res = create_csv_database('csv_db/x.csv')
-    print_head(res)
-
-    add_row(res, { "a_key": ["x"], "a_value": ["y"] })
-    print_head(res)
-
-    save_db(res)
-
-    delete_row_by_key(res, "x")
-    print_head(res)
-  })
-})

pos-frontend/__test__/db.test.ts

@@ -0,0 +1,32 @@
+import '@testing-library/jest-dom'
+import pl from 'nodejs-polars'
+import { create_csv_database, add_row, print_head, delete_row_by_key, save_db } from '../app/database'
+
+describe('DATABASE', () => {
+  it('DATA', () => {
+    const fooSeries = pl.Series("foo", [1, 2, 3])
+
+    let res = fooSeries.sum()
+
+    console.log(res)
+
+    let df = pl.readCSV("data/iris.csv")
+  })
+
+  it('create csv', () => {
+    let res = create_csv_database('csv_db/x.csv', { "a_key": [], "a_value": [] })
+    print_head(res)
+
+    add_row(res, { "a_key": ["x"], "a_value": ["y"] })
+    print_head(res)
+
+    save_db(res)
+
+    delete_row_by_key(res, "x", "a_key")
+    print_head(res)
+  })
+
+  it('creates pos model', () => {
+
+  })
+})

pos-frontend/app/database.ts

@@ -1,57 +1,43 @@
-import pl, { DataFrame } from 'nodejs-polars'
-import fs, { writeFile } from 'fs'
+import pl, { DataFrame, Series } from 'nodejs-polars'
+import fs from 'fs'
 
-export function test_x(params: any) {
-  const fooSeries = pl.Series("foo", [1, 2, 3])
-
-  let res = fooSeries.sum()
-
-  console.log(res)
-
-  let df = pl.readCSV("data/iris.csv")
-}
-
-interface CSVDatabase2 {
+export interface CSVDatabase {
   df: DataFrame
   filepath: string
 }
 
-export function create_csv_database(filepath: string): CSVDatabase2 {
-  let df = DataFrame({ 'a_key': ['1'], 'a_value': ['2'] })
-
+export function create_csv_database(filepath: string, initialData: any): CSVDatabase {
+  let df = DataFrame(initialData)
   df.writeCSV(filepath)
-
   return { df, filepath }
 }
 
-export function save_db(db: CSVDatabase2) {
+export function save_db(db: CSVDatabase) {
   db.df.writeCSV(db.filepath)
 }
 
-export function add_row(db: CSVDatabase2, row: any) {
-  let d = DataFrame(row)
+export function add_row(db: CSVDatabase, row: any) {
+  let d = DataFrame([row])
   db.df = db.df.vstack(d)
 }
 
-export function print_head(db: CSVDatabase2) {
+export function print_head(db: CSVDatabase) {
   console.log(db.df.head())
 }
 
-export function delete_row_by_key(db: CSVDatabase2, key: string) {
-  console.log("NEXT COLUMNS")
-  console.log(db.df.columns)
-  db.df = db.df.filter(pl.col('a_key').neq(pl.lit(key)))
+export function delete_row_by_key(db: CSVDatabase, key: string, keyColumn: string) {
+  db.df = db.df.filter(pl.col(keyColumn).neq(pl.lit(key)))
 }
 
-export function select_columns(db: CSVDatabase2, columns: string[]): DataFrame {
+export function select_columns(db: CSVDatabase, columns: string[]): DataFrame {
   return db.df.select(...columns)
 }
 
-export function join_dataframes(db1: CSVDatabase2, db2: CSVDatabase2, on: string): DataFrame {
-  return db1.df.join(db2.df, { on, how: "inner" }) // or "left", "right", "outer"
+export function join_dataframes(db1: CSVDatabase, db2: CSVDatabase, on: string): DataFrame {
+  return db1.df.join(db2.df, { on, how: "inner" })
 }
 
-export function add_simple_index(db: CSVDatabase2) {
+export function add_simple_index(db: CSVDatabase) {
   const indices = Array.from(Array(db.df.height).keys()) // Create 0-N index
   db.df = db.df.withColumn(pl.Series("index", indices))
 }

pos-frontend/app/model.tsx

@@ -1,5 +1,8 @@
 // point of sales model core
 
+import { CSVDatabase } from "./database"
+import { create_csv_database, print_head } from "./database"
+
 interface Item {
   id: string
   name: string
@@ -19,3 +22,48 @@ interface Inventory {
   itemId: string
   quantity: number
 }
+
+export function create_item_dataframe(items: Item[]): CSVDatabase {
+  const filepath = 'data/items.csv'
+  return create_csv_database(filepath, items)
+}
+
+export function create_sale_dataframe(sales: Sale[]): CSVDatabase {
+  const filepath = 'data/sales.csv'
+  const data = sales.map(sale => ({
+    ...sale,
+    timestamp: sale.timestamp.toISOString() // Convert Date to string
+  }))
+  return create_csv_database(filepath, data)
+}
+
+export function create_inventory_dataframe(inventories: Inventory[]): CSVDatabase {
+  const filepath = 'data/inventory.csv'
+  return create_csv_database(filepath, inventories)
+}
+
+
+function create_models() {
+  const items: Item[] = [
+    { id: '1', name: 'Item 1', price: 100 },
+    { id: '2', name: 'Item 2', price: 200 }
+  ]
+
+  const sales: Sale[] = [
+    { id: '1', itemId: '1', quantity: 2, timestamp: new Date() },
+    { id: '2', itemId: '2', quantity: 1, timestamp: new Date() }
+  ]
+
+  const inventories: Inventory[] = [
+    { itemId: '1', quantity: 50 },
+    { itemId: '2', quantity: 30 }
+  ]
+
+  const itemDB = create_item_dataframe(items)
+  const saleDB = create_sale_dataframe(sales)
+  const inventoryDB = create_inventory_dataframe(inventories)
+
+  print_head(itemDB)
+  print_head(saleDB)
+  print_head(inventoryDB)
+}

pos-frontend/babel.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  presets: [
+    ['@babel/preset-env', { targets: { node: 'current' } }],
+    '@babel/preset-typescript',
+  ],
+}

pos-frontend/csv_db/x.csv

@@ -1,3 +1 @@
 a_key,a_value
-1,2
-x,y