From 896b16e08ed9bb5110d3264d70fc2f7719a9ac81 Mon Sep 17 00:00:00 2001
From: AbleKSaju <126228406+AbleKSaju@users.noreply.github.com>
Date: Thu, 26 Dec 2024 15:17:49 +0530
Subject: [PATCH] feat: WeightEnabledBarcode in POS

---
 .../Controls/weightEnabledBarcode.vue         | 198 ++++++++++++++++++
 src/pages/POS/ClassicPOS.vue                  |  19 +-
 src/pages/POS/ModernPOS.vue                   |  19 +-
 3 files changed, 232 insertions(+), 4 deletions(-)
 create mode 100644 src/components/Controls/weightEnabledBarcode.vue

diff --git a/src/components/Controls/weightEnabledBarcode.vue b/src/components/Controls/weightEnabledBarcode.vue
new file mode 100644
index 00000000..cab28f10
--- /dev/null
+++ b/src/components/Controls/weightEnabledBarcode.vue
@@ -0,0 +1,198 @@
+<template>
+  <div
+    class="
+      px-2
+      w-36
+      flex
+      items-center
+      border
+      rounded
+      bg-gray-50
+      dark:border-gray-800 dark:bg-gray-890 dark:focus-within:bg-gray-900
+      focus-within:bg-gray-100
+    "
+  >
+    <input
+      ref="scanner"
+      type="text"
+      class="text-base placeholder-gray-600 w-full bg-transparent outline-none"
+      :placeholder="t`Enter weight barcode`"
+      @change="handleChange"
+    />
+    <feather-icon
+      name="maximize"
+      class="w-3 h-3 text-gray-600 dark:text-gray-400 cursor-text"
+      @click="() => ($refs.scanner as HTMLInputElement).focus()"
+    />
+  </div>
+</template>
+
+<script lang="ts">
+import { showToast } from 'src/utils/interactive';
+import { defineComponent } from 'vue';
+export default defineComponent({
+  emits: ['item-selected'],
+  data() {
+    return {
+      timerId: null,
+      barcode: '',
+      cooldown: '',
+    } as {
+      timerId: null | ReturnType<typeof setTimeout>;
+      barcode: string;
+      cooldown: string;
+    };
+  },
+  mounted() {
+    document.addEventListener('keydown', this.scanListener);
+  },
+  unmounted() {
+    document.removeEventListener('keydown', this.scanListener);
+  },
+  activated() {
+    document.addEventListener('keydown', this.scanListener);
+  },
+  deactivated() {
+    document.removeEventListener('keydown', this.scanListener);
+  },
+  methods: {
+    handleChange(e: Event) {
+      const elem = e.target as HTMLInputElement;
+      this.selectItem(elem.value);
+      elem.value = '';
+    },
+
+    async selectItem(code: string) {
+      const barcode = code.trim();
+      if (this.cooldown === barcode) {
+        return;
+      }
+
+      this.cooldown = barcode;
+      setTimeout(() => (this.cooldown = ''), 100);
+
+      const isWeightEnabled =
+        this.fyo.singles.POSSettings?.weightEnabledBarcode;
+      const randomNumberLength = this.fyo.singles.POSSettings
+        ?.randomNumberLength as number;
+      const ItemBarcodeLength = this.fyo.singles.POSSettings
+        ?.ItemBarcodeLength as number;
+      const quantityBarcodeLength = this.fyo.singles.POSSettings
+        ?.quantityBarcodeLength as number;
+
+      if (
+        code.length !==
+        randomNumberLength + ItemBarcodeLength + quantityBarcodeLength
+      ) {
+        return this.error(this.t`Barcode ${barcode} has an invalid length.`);
+      }
+
+      const filters: Record<string, string> = isWeightEnabled
+        ? {
+            weightBarcode: barcode.slice(
+              randomNumberLength,
+              randomNumberLength + ItemBarcodeLength
+            ),
+          }
+        : { barcode };
+      const fields = isWeightEnabled ? ['name', 'unit'] : ['name'];
+
+      const items =
+        (await this.fyo.db.getAll('Item', { filters, fields })) || [];
+      const { name, unit } = items[0] || {};
+
+      if (!name) {
+        return this.error(this.t`Item with barcode ${barcode} not found.`);
+      }
+
+      const quantity = isWeightEnabled
+        ? this.parseBarcode(
+            barcode,
+            unit as string,
+            randomNumberLength + ItemBarcodeLength
+          )
+        : 1;
+
+      this.success(this.t`${name as string} quantity ${quantity} added.`);
+      this.$emit('item-selected', name, quantity);
+    },
+
+    parseBarcode(barcode: string, unitType: string, sliceDigit: number) {
+      const weightRaw = parseInt(barcode.slice(sliceDigit), sliceDigit);
+
+      let itemQuantity = 0;
+
+      switch (unitType) {
+        case 'Kg':
+          itemQuantity = Math.floor(weightRaw / 1000);
+          break;
+        case 'Gram':
+          itemQuantity = weightRaw;
+          break;
+        case 'Unit':
+        case 'Meter':
+        case 'Hour':
+        case 'Day':
+          itemQuantity = weightRaw;
+          break;
+        default:
+          throw new Error('Unknown unit type!');
+      }
+
+      return itemQuantity;
+    },
+    async scanListener({ key, code }: KeyboardEvent) {
+      /**
+       * Based under the assumption that
+       * - Barcode scanners trigger keydown events
+       * - Keydown events are triggered quicker than human can
+       *    i.e. at max 20ms between events
+       * - Keydown events are triggered for barcode digits
+       * - The sequence of digits might be punctuated by a return
+       */
+
+      const keyCode = Number(key);
+      const isEnter = code === 'Enter';
+      if (Number.isNaN(keyCode) && !isEnter) {
+        return;
+      }
+
+      if (isEnter) {
+        return await this.setItemFromBarcode();
+      }
+
+      this.clearInterval();
+
+      this.barcode += key;
+      this.timerId = setTimeout(async () => {
+        await this.setItemFromBarcode();
+        this.barcode = '';
+      }, 20);
+    },
+    async setItemFromBarcode() {
+      if (this.barcode.length < 12) {
+        return;
+      }
+
+      await this.selectItem(this.barcode);
+
+      this.barcode = '';
+      this.clearInterval();
+    },
+    clearInterval() {
+      if (this.timerId === null) {
+        return;
+      }
+
+      clearInterval(this.timerId);
+      this.timerId = null;
+    },
+    error(message: string) {
+      showToast({ type: 'error', message });
+    },
+    success(message: string) {
+      showToast({ type: 'success', message });
+    },
+  },
+});
+</script>
diff --git a/src/pages/POS/ClassicPOS.vue b/src/pages/POS/ClassicPOS.vue
index 88e27c9f..a2617bba 100644
--- a/src/pages/POS/ClassicPOS.vue
+++ b/src/pages/POS/ClassicPOS.vue
@@ -98,7 +98,10 @@
             />
 
             <Barcode
-              v-if="fyo.singles.InventorySettings?.enableBarcodes"
+              v-if="
+                fyo.singles.InventorySettings?.enableBarcodes &&
+                !fyo.singles.POSSettings?.weightEnabledBarcode
+              "
               class="w-1/3"
               @item-selected="
                 async (name: string) => {
@@ -106,6 +109,16 @@
                 }
               "
             />
+
+            <WeightEnabledBarcode
+              v-if="fyo.singles.POSSettings?.weightEnabledBarcode"
+              class="w-1/3"
+              @item-selected="
+                async (name: string,qty:number) => {
+                  emitEvent('addItem', await getItem(name) as Item,qty as number);
+                }
+              "
+            />
           </div>
 
           <ItemsTable
@@ -313,6 +326,7 @@ import ItemsTable from 'src/components/POS/Classic/ItemsTable.vue';
 import MultiLabelLink from 'src/components/Controls/MultiLabelLink.vue';
 import { SalesInvoice } from 'models/baseModels/SalesInvoice/SalesInvoice';
 import SelectedItemTable from 'src/components/POS/Classic/SelectedItemTable.vue';
+import WeightEnabledBarcode from 'src/components/Controls/weightEnabledBarcode.vue';
 import FloatingLabelFloatInput from 'src/components/POS/FloatingLabelFloatInput.vue';
 import FloatingLabelCurrencyInput from 'src/components/POS/FloatingLabelCurrencyInput.vue';
 import { AppliedCouponCodes } from 'models/baseModels/AppliedCouponCodes/AppliedCouponCodes';
@@ -336,6 +350,7 @@ export default defineComponent({
     SavedInvoiceModal,
     ClosePOSShiftModal,
     LoyaltyProgramModal,
+    WeightEnabledBarcode,
     FloatingLabelFloatInput,
     FloatingLabelCurrencyInput,
   },
@@ -414,7 +429,7 @@ export default defineComponent({
   methods: {
     emitEvent(
       eventName: PosEmits,
-      ...args: (string | boolean | Item | Money)[]
+      ...args: (string | boolean | Item | number | Money)[]
     ) {
       this.$emit(eventName, ...args);
     },
diff --git a/src/pages/POS/ModernPOS.vue b/src/pages/POS/ModernPOS.vue
index 022f0250..27af9af7 100644
--- a/src/pages/POS/ModernPOS.vue
+++ b/src/pages/POS/ModernPOS.vue
@@ -255,7 +255,10 @@
             />
 
             <Barcode
-              v-if="fyo.singles.InventorySettings?.enableBarcodes"
+              v-if="
+                fyo.singles.InventorySettings?.enableBarcodes &&
+                !fyo.singles.POSSettings?.weightEnabledBarcode
+              "
               class="w-1/3"
               @item-selected="
                 async (name: string) => {
@@ -263,6 +266,16 @@
                 }
               "
             />
+
+            <WeightEnabledBarcode
+              v-if="fyo.singles.POSSettings?.weightEnabledBarcode"
+              class="w-1/3"
+              @item-selected="
+                async (name: string,qty:number) => {
+                  emitEvent('addItem', await getItem(name) as Item,qty as number);
+                }
+              "
+            />
           </div>
 
           <ModernPOSItemsTable
@@ -321,6 +334,7 @@ import { POSItem, PosEmits, ItemQtyMap } from 'src/components/POS/types';
 import { SalesInvoice } from 'models/baseModels/SalesInvoice/SalesInvoice';
 import ModernPOSItemsGrid from 'src/components/POS/Modern/ModernPOSItemsGrid.vue';
 import ModernPOSItemsTable from 'src/components/POS/Modern/ModernPOSItemsTable.vue';
+import WeightEnabledBarcode from 'src/components/Controls/weightEnabledBarcode.vue';
 import FloatingLabelFloatInput from 'src/components/POS/FloatingLabelFloatInput.vue';
 import { SalesInvoiceItem } from 'models/baseModels/SalesInvoiceItem/SalesInvoiceItem';
 import FloatingLabelCurrencyInput from 'src/components/POS/FloatingLabelCurrencyInput.vue';
@@ -346,6 +360,7 @@ export default defineComponent({
     ClosePOSShiftModal,
     LoyaltyProgramModal,
     ModernPOSItemsTable,
+    WeightEnabledBarcode,
     FloatingLabelFloatInput,
     FloatingLabelCurrencyInput,
     ModernPOSSelectedItemTable,
@@ -430,7 +445,7 @@ export default defineComponent({
   methods: {
     emitEvent(
       eventName: PosEmits,
-      ...args: (string | boolean | Item | Money)[]
+      ...args: (string | boolean | Item | number | Money)[]
     ) {
       this.$emit(eventName, ...args);
     },