feat: Barcode scanning in Stock Reconciliation

[skip ci]
diff --git a/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.js b/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.js
index 4438acf..3e8ac1f 100644
--- a/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.js
+++ b/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.js
@@ -55,6 +55,25 @@
 		}
 	},
 
+	scan_barcode: function(frm) {
+		const barcode_scanner = new erpnext.utils.BarcodeScanner({frm:frm});
+		barcode_scanner.process_scan();
+	},
+
+	scan_mode: function(frm) {
+		if (frm.doc.scan_mode) {
+			frappe.show_alert({
+				message: __("Scan mode enabled, existing quantity will not be fetched."),
+				indicator: "green"
+			});
+		}
+	},
+
+	set_warehouse: function(frm) {
+		let transaction_controller = new erpnext.TransactionController({frm:frm});
+		transaction_controller.autofill_warehouse(frm.doc.items, "warehouse", frm.doc.set_warehouse);
+	},
+
 	get_items: function(frm) {
 		let fields = [
 			{
@@ -148,15 +167,18 @@
 					batch_no: d.batch_no
 				},
 				callback: function(r) {
-					frappe.model.set_value(cdt, cdn, "qty", r.message.qty);
+					const row = frappe.model.get_doc(cdt, cdn);
+					if (!frm.doc.scan_mode) {
+						frappe.model.set_value(cdt, cdn, "qty", r.message.qty);
+					}
 					frappe.model.set_value(cdt, cdn, "valuation_rate", r.message.rate);
 					frappe.model.set_value(cdt, cdn, "current_qty", r.message.qty);
 					frappe.model.set_value(cdt, cdn, "current_valuation_rate", r.message.rate);
 					frappe.model.set_value(cdt, cdn, "current_amount", r.message.rate * r.message.qty);
-					frappe.model.set_value(cdt, cdn, "amount", r.message.rate * r.message.qty);
+					frappe.model.set_value(cdt, cdn, "amount", row.qty * row.valuation_rate);
 					frappe.model.set_value(cdt, cdn, "current_serial_no", r.message.serial_nos);
 
-					if (frm.doc.purpose == "Stock Reconciliation") {
+					if (frm.doc.purpose == "Stock Reconciliation" && !frm.doc.scan_mode) {
 						frappe.model.set_value(cdt, cdn, "serial_no", r.message.serial_nos);
 					}
 				}
@@ -239,7 +261,14 @@
 			const serial_nos = child.serial_no.trim().split('\n');
 			frappe.model.set_value(cdt, cdn, "qty", serial_nos.length);
 		}
-	}
+	},
+
+	items_add: function(frm, cdt, cdn) {
+		var item = frappe.get_doc(cdt, cdn);
+		if (!item.warehouse && frm.doc.set_warehouse) {
+			frappe.model.set_value(cdt, cdn, "warehouse", frm.doc.set_warehouse);
+		}
+	},
 
 });
 
diff --git a/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.json b/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.json
index a882a61..e545b8e 100644
--- a/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.json
+++ b/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.json
@@ -14,6 +14,12 @@
   "posting_date",
   "posting_time",
   "set_posting_time",
+  "section_break_8",
+  "set_warehouse",
+  "section_break_22",
+  "scan_barcode",
+  "column_break_12",
+  "scan_mode",
   "sb9",
   "items",
   "section_break_9",
@@ -139,13 +145,44 @@
   {
    "fieldname": "dimension_col_break",
    "fieldtype": "Column Break"
+  },
+  {
+   "fieldname": "section_break_8",
+   "fieldtype": "Section Break"
+  },
+  {
+   "fieldname": "scan_barcode",
+   "fieldtype": "Data",
+   "label": "Scan Barcode",
+   "options": "Barcode"
+  },
+  {
+   "default": "0",
+   "description": "Disables auto-fetching of existing quantity",
+   "fieldname": "scan_mode",
+   "fieldtype": "Check",
+   "label": "Scan Mode"
+  },
+  {
+   "fieldname": "set_warehouse",
+   "fieldtype": "Link",
+   "label": "Default Warehouse",
+   "options": "Warehouse"
+  },
+  {
+   "fieldname": "section_break_22",
+   "fieldtype": "Section Break"
+  },
+  {
+   "fieldname": "column_break_12",
+   "fieldtype": "Column Break"
   }
  ],
  "icon": "fa fa-upload-alt",
  "idx": 1,
  "is_submittable": 1,
  "links": [],
- "modified": "2022-02-06 14:28:19.043905",
+ "modified": "2022-03-27 08:57:47.161959",
  "modified_by": "Administrator",
  "module": "Stock",
  "name": "Stock Reconciliation",