feat: Add stock ageing data to stock balance report (#19036)

* feat: Add stock ageing data to stock balance report

* fix: Use fifo queue warehouse wise

* fix: "Stock Ledger Entry" get query

* fix: Remove unwanted quotes in item details query

* fix: Check if no SLE was passed

* fix: Codacy

* fix: Add logic to include additional UOM columns

* fix: Show stock ageing data optionally
diff --git a/erpnext/stock/report/stock_ageing/stock_ageing.py b/erpnext/stock/report/stock_ageing/stock_ageing.py
index 83a1d7b..e83bf1d 100644
--- a/erpnext/stock/report/stock_ageing/stock_ageing.py
+++ b/erpnext/stock/report/stock_ageing/stock_ageing.py
@@ -131,19 +131,20 @@
 
 	return columns
 
-def get_fifo_queue(filters):
+def get_fifo_queue(filters, sle=None):
 	item_details = {}
-	transfered_item_details = {}
+	transferred_item_details = {}
 	serial_no_batch_purchase_details = {}
 
-	sle = get_stock_ledger_entries(filters)
+	if sle == None:
+		sle = get_stock_ledger_entries(filters)
 
 	for d in sle:
-		key = (d.name, d.warehouse) if filters.get('show_warehouse_wise_stock') else d.name
+ 		key = (d.name, d.warehouse) if filters.get('show_warehouse_wise_stock') else d.name
 		item_details.setdefault(key, {"details": d, "fifo_queue": []})
 		fifo_queue = item_details[key]["fifo_queue"]
 
-		transfered_item_details.setdefault((d.voucher_no, d.name), [])
+		transferred_item_details.setdefault((d.voucher_no, d.name), [])
 
 		if d.voucher_type == "Stock Reconciliation":
 			d.actual_qty = flt(d.qty_after_transaction) - flt(item_details[key].get("qty_after_transaction", 0))
@@ -151,10 +152,10 @@
 		serial_no_list = get_serial_nos(d.serial_no) if d.serial_no else []
 
 		if d.actual_qty > 0:
-			if transfered_item_details.get((d.voucher_no, d.name)):
-				batch = transfered_item_details[(d.voucher_no, d.name)][0]
+			if transferred_item_details.get((d.voucher_no, d.name)):
+				batch = transferred_item_details[(d.voucher_no, d.name)][0]
 				fifo_queue.append(batch)
-				transfered_item_details[((d.voucher_no, d.name))].pop(0)
+				transferred_item_details[((d.voucher_no, d.name))].pop(0)
 			else:
 				if serial_no_list:
 					for serial_no in serial_no_list:
@@ -178,11 +179,11 @@
 						# if batch qty > 0
 						# not enough or exactly same qty in current batch, clear batch
 						qty_to_pop -= batch[0]
-						transfered_item_details[(d.voucher_no, d.name)].append(fifo_queue.pop(0))
+						transferred_item_details[(d.voucher_no, d.name)].append(fifo_queue.pop(0))
 					else:
 						# all from current batch
 						batch[0] -= qty_to_pop
-						transfered_item_details[(d.voucher_no, d.name)].append([qty_to_pop, batch[1]])
+						transferred_item_details[(d.voucher_no, d.name)].append([qty_to_pop, batch[1]])
 						qty_to_pop = 0
 
 		item_details[key]["qty_after_transaction"] = d.qty_after_transaction
diff --git a/erpnext/stock/report/stock_balance/stock_balance.js b/erpnext/stock/report/stock_balance/stock_balance.js
index 3829d6a..537fa7c 100644
--- a/erpnext/stock/report/stock_balance/stock_balance.js
+++ b/erpnext/stock/report/stock_balance/stock_balance.js
@@ -41,7 +41,7 @@
 			"get_query": function() {
 				return {
 					query: "erpnext.controllers.queries.item_query",
-				}
+				};
 			}
 		},
 		{
@@ -57,7 +57,7 @@
 						filters: {
 							'warehouse_type': warehouse_type
 						}
-					}
+					};
 				}
 			}
 		},
@@ -79,5 +79,10 @@
 			"label": __("Show Variant Attributes"),
 			"fieldtype": "Check"
 		},
+		{
+			"fieldname": 'show_stock_ageing_data',
+			"label": __('Show Stock Ageing Data'),
+			"fieldtype": 'Check'
+		},
 	]
-}
+};
diff --git a/erpnext/stock/report/stock_balance/stock_balance.py b/erpnext/stock/report/stock_balance/stock_balance.py
index 8b6590d..e5ae70c 100644
--- a/erpnext/stock/report/stock_balance/stock_balance.py
+++ b/erpnext/stock/report/stock_balance/stock_balance.py
@@ -4,10 +4,12 @@
 from __future__ import unicode_literals
 import frappe
 from frappe import _
-from frappe.utils import flt, cint, getdate, now
-from erpnext.stock.utils import update_included_uom_in_report
+from frappe.utils import flt, cint, getdate, now, date_diff
+from erpnext.stock.utils import add_additional_uom_columns
 from erpnext.stock.report.stock_ledger.stock_ledger import get_item_group_condition
 
+from erpnext.stock.report.stock_ageing.stock_ageing import get_fifo_queue, get_average_age
+
 from six import iteritems
 
 def execute(filters=None):
@@ -15,11 +17,18 @@
 
 	validate_filters(filters)
 
+	from_date = filters.get('from_date')
+	to_date = filters.get('to_date')
+
 	include_uom = filters.get("include_uom")
-	columns = get_columns()
+	columns = get_columns(filters)
 	items = get_items(filters)
 	sle = get_stock_ledger_entries(filters, items)
 
+	if filters.get('show_stock_ageing_data'):
+		filters['show_warehouse_wise_stock'] = True
+		item_wise_fifo_queue = get_fifo_queue(filters, sle)
+
 	# if no stock ledger entry found return
 	if not sle:
 		return columns, []
@@ -29,7 +38,7 @@
 	item_reorder_detail_map = get_item_reorder_details(item_map.keys())
 
 	data = []
-	conversion_factors = []
+	conversion_factors = {}
 	for (company, item, warehouse) in sorted(iwb_map):
 		if item_map.get(item):
 			qty_dict = iwb_map[(company, item, warehouse)]
@@ -39,36 +48,41 @@
 				item_reorder_level = item_reorder_detail_map[item + warehouse]["warehouse_reorder_level"]
 				item_reorder_qty = item_reorder_detail_map[item + warehouse]["warehouse_reorder_qty"]
 
-			report_data = [item, item_map[item]["item_name"],
-				item_map[item]["item_group"],
-				item_map[item]["brand"],
-				item_map[item]["description"], warehouse,
-				item_map[item]["stock_uom"], qty_dict.bal_qty,
-				qty_dict.bal_val, qty_dict.opening_qty,
-				qty_dict.opening_val, qty_dict.in_qty,
-				qty_dict.in_val, qty_dict.out_qty,
-				qty_dict.out_val, qty_dict.val_rate,
-				item_reorder_level,
-				item_reorder_qty,
-				company
-			]
-
-			if filters.get('show_variant_attributes', 0) == 1:
-				variants_attributes = get_variants_attributes()
-				report_data += [item_map[item].get(i) for i in variants_attributes]
+			report_data = {
+				'item_code': item,
+				'warehouse': warehouse,
+				'company': company,
+				'reorder_level': item_reorder_qty,
+				'reorder_qty': item_reorder_qty,
+			}
+			report_data.update(item_map[item])
+			report_data.update(qty_dict)
 
 			if include_uom:
-				conversion_factors.append(item_map[item].conversion_factor)
+				conversion_factors.setdefault(item, item_map[item].conversion_factor)
+
+			if filters.get('show_stock_ageing_data'):
+				fifo_queue = item_wise_fifo_queue[(item, warehouse)].get('fifo_queue')
+
+				stock_ageing_data = {
+					'average_age': 0,
+					'earliest_age': 0,
+					'latest_age': 0
+				}
+				if fifo_queue:
+					fifo_queue = sorted(fifo_queue, key=lambda fifo_data: fifo_data[1])
+					stock_ageing_data['average_age'] = get_average_age(fifo_queue, to_date)
+					stock_ageing_data['earliest_age'] = date_diff(to_date, fifo_queue[0][1])
+					stock_ageing_data['latest_age'] = date_diff(to_date, fifo_queue[-1][1])
+
+				report_data.update(stock_ageing_data)
 
 			data.append(report_data)
 
-	if filters.get('show_variant_attributes', 0) == 1:
-		columns += ["{}:Data:100".format(i) for i in get_variants_attributes()]
-
-	update_included_uom_in_report(columns, data, include_uom, conversion_factors)
+	add_additional_uom_columns(columns, data, include_uom, conversion_factors)
 	return columns, data
 
-def get_columns():
+def get_columns(filters):
 	"""return columns"""
 
 	columns = [
@@ -93,6 +107,14 @@
 		{"label": _("Company"), "fieldname": "company", "fieldtype": "Link", "options": "Company", "width": 100}
 	]
 
+	if filters.get('show_stock_ageing_data'):
+		columns += [{'label': _('Average Age'), 'fieldname': 'average_age', 'width': 100},
+		{'label': _('Earliest Age'), 'fieldname': 'earliest_age', 'width': 100},
+		{'label': _('Latest Age'), 'fieldname': 'latest_age', 'width': 100}]
+
+	if filters.get('show_variant_attributes'):
+		columns += [{'label': att_name, 'fieldname': att_name, 'width': 100} for att_name in get_variants_attributes()]
+
 	return columns
 
 def get_conditions(filters):
@@ -130,11 +152,12 @@
 	return frappe.db.sql("""
 		select
 			sle.item_code, warehouse, sle.posting_date, sle.actual_qty, sle.valuation_rate,
-			sle.company, sle.voucher_type, sle.qty_after_transaction, sle.stock_value_difference
+			sle.company, sle.voucher_type, sle.qty_after_transaction, sle.stock_value_difference,
+			sle.item_code as name, sle.voucher_no
 		from
 			`tabStock Ledger Entry` sle force index (posting_sort_index)
 		where sle.docstatus < 2 %s %s
-		order by sle.posting_date, sle.posting_time, sle.creation""" %
+		order by sle.posting_date, sle.posting_time, sle.creation, sle.actual_qty""" % #nosec
 		(item_conditions_sql, conditions), as_dict=1)
 
 def get_item_warehouse_map(filters, sle):
@@ -226,7 +249,7 @@
 	cf_field = cf_join = ""
 	if filters.get("include_uom"):
 		cf_field = ", ucd.conversion_factor"
-		cf_join = "left join `tabUOM Conversion Detail` ucd on ucd.parent=item.name and ucd.uom='%s'" \
+		cf_join = "left join `tabUOM Conversion Detail` ucd on ucd.parent=item.name and ucd.uom=%s" \
 			% frappe.db.escape(filters.get("include_uom"))
 
 	res = frappe.db.sql("""
diff --git a/erpnext/stock/utils.py b/erpnext/stock/utils.py
index aec37d4..4c663e3 100644
--- a/erpnext/stock/utils.py
+++ b/erpnext/stock/utils.py
@@ -281,4 +281,36 @@
 
 def get_available_serial_nos(item_code, warehouse):
 	return frappe.get_all("Serial No", filters = {'item_code': item_code,
-		'warehouse': warehouse, 'delivery_document_no': ''}) or []
\ No newline at end of file
+		'warehouse': warehouse, 'delivery_document_no': ''}) or []
+
+def add_additional_uom_columns(columns, result, include_uom, conversion_factors):
+	if not include_uom or not conversion_factors:
+		return
+
+	convertible_column_map = {}
+	for col_idx in list(reversed(range(0, len(columns)))):
+		col = columns[col_idx]
+		if isinstance(col, dict) and col.get('convertible') in ['rate', 'qty']:
+			next_col = col_idx + 1
+			columns.insert(next_col, col.copy())
+			columns[next_col]['fieldname'] += '_alt'
+			convertible_column_map[col.get('fieldname')] = frappe._dict({
+				'converted_col': columns[next_col]['fieldname'],
+				'for_type': col.get('convertible')
+			})
+			if col.get('convertible') == 'rate':
+				columns[next_col]['label'] += ' (per {})'.format(include_uom)
+			else:
+				columns[next_col]['label'] += ' ({})'.format(include_uom)
+
+	for row_idx, row in enumerate(result):
+		for convertible_col, data in convertible_column_map.items():
+			conversion_factor = conversion_factors[row.get('item_code')] or 1
+			for_type = data.for_type
+			value_before_conversion = row.get(convertible_col)
+			if for_type == 'rate':
+				row[data.converted_col] = flt(value_before_conversion) * conversion_factor
+			else:
+				row[data.converted_col] = flt(value_before_conversion) / conversion_factor
+
+		result[row_idx] = row
\ No newline at end of file