Patch: Create Payment Terms based on default credit days set in company and use it while setting due_date (#12685)

* Patch: Create Payment Terms based on default credit days set in company and use it while setting due_date

* Payment Terms patch for credit days defined in customer group
diff --git a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
index 07853d0..28d51ce 100644
--- a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
+++ b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
@@ -96,7 +96,7 @@
 		if not self.credit_to:
 			self.credit_to = get_party_account("Supplier", self.supplier, self.company)
 		if not self.due_date:
-			self.due_date = get_due_date(self.posting_date, "Supplier", self.supplier)
+			self.due_date = get_due_date(self.posting_date, "Supplier", self.supplier, self.company)
 
 		super(PurchaseInvoice, self).set_missing_values(for_validate)
 
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index f6d43c7..b6c8405 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -237,7 +237,7 @@
 		if not self.debit_to:
 			self.debit_to = get_party_account("Customer", self.customer, self.company)
 		if not self.due_date and self.customer:
-			self.due_date = get_due_date(self.posting_date, "Customer", self.customer)
+			self.due_date = get_due_date(self.posting_date, "Customer", self.customer, self.company)
 
 		super(SalesInvoice, self).set_missing_values(for_validate)
 
diff --git a/erpnext/accounts/party.py b/erpnext/accounts/party.py
index 7bccfe8..5237a71 100644
--- a/erpnext/accounts/party.py
+++ b/erpnext/accounts/party.py
@@ -51,7 +51,7 @@
 	set_other_values(out, party, party_type)
 	set_price_list(out, party, party_type, price_list)
 	out["taxes_and_charges"] = set_taxes(party.name, party_type, posting_date, company, out.customer_group, out.supplier_type)
-	out["payment_terms_template"] = get_pyt_term_template(party.name, party_type)
+	out["payment_terms_template"] = get_pyt_term_template(party.name, party_type, company)
 
 	if not out.get("currency"):
 		out["currency"] = currency
@@ -164,7 +164,7 @@
 	out = {
 		party_type.lower(): party,
 		account_fieldname : account,
-		"due_date": get_due_date(posting_date, party_type, party)
+		"due_date": get_due_date(posting_date, party_type, party, company)
 	}
 	return out
 
@@ -267,12 +267,12 @@
 
 
 @frappe.whitelist()
-def get_due_date(posting_date, party_type, party):
+def get_due_date(posting_date, party_type, party, company=None):
 	"""Get due date from `Payment Terms Template`"""
 	due_date = None
 	if posting_date and party:
 		due_date = posting_date
-		template_name = get_pyt_term_template(party, party_type)
+		template_name = get_pyt_term_template(party, party_type, company)
 		if template_name:
 			due_date = get_due_date_from_template(template_name, posting_date).strftime("%Y-%m-%d")
 		else:
@@ -305,12 +305,11 @@
 
 	return due_date
 
-
-def validate_due_date(posting_date, due_date, party_type, party):
+def validate_due_date(posting_date, due_date, party_type, party, company=None):
 	if getdate(due_date) < getdate(posting_date):
 		frappe.throw(_("Due Date cannot be before Posting Date"))
 	else:
-		default_due_date = get_due_date(posting_date, party_type, party)
+		default_due_date = get_due_date(posting_date, party_type, party, company)
 		if not default_due_date:
 			return
 
@@ -360,14 +359,32 @@
 
 
 @frappe.whitelist()
-def get_pyt_term_template(party_name, party_type):
+def get_pyt_term_template(party_name, party_type, company=None):
+	if party_type not in ("Customer", "Supplier"):
+		return
+
 	template = None
-	if party_type in ('Customer', 'Supplier'):
-		template = frappe.db.get_value(party_type, party_name, fieldname='payment_terms')
+	if party_type == 'Customer':
+		customer = frappe.db.get_value("Customer", party_name,
+			fieldname=['payment_terms', "customer_group"], as_dict=1)
+		template = customer.payment_terms
+
+		if not template and customer.customer_group:
+			template = frappe.db.get_value("Customer Group",
+				customer.customer_group, fieldname='payment_terms')
+	else:
+		supplier = frappe.db.get_value("Supplier", party_name,
+			fieldname=['payment_terms', "supplier_type"], as_dict=1)
+		template = supplier.payment_terms
+
+		if not template and supplier.supplier_type:
+			template = frappe.db.get_value("Supplier Type", supplier.supplier_type, fieldname='payment_terms')
+
+	if not template and company:
+		template = frappe.db.get_value("Company", company, fieldname='payment_terms')
 
 	return template
 
-
 def validate_party_frozen_disabled(party_type, party_name):
 	if party_type and party_name:
 		if party_type in ("Customer", "Supplier"):
diff --git a/erpnext/buying/doctype/supplier/test_records.json b/erpnext/buying/doctype/supplier/test_records.json
index 7479f55..370ce8d 100644
--- a/erpnext/buying/doctype/supplier/test_records.json
+++ b/erpnext/buying/doctype/supplier/test_records.json
@@ -9,7 +9,6 @@
   "doctype": "Supplier",
   "supplier_name": "_Test Supplier P",
   "supplier_type": "_Test Supplier Type",
-  "credit_days_based_on": "Fixed Days"
  },
  {
   "doctype": "Supplier",
diff --git a/erpnext/controllers/accounts_controller.py b/erpnext/controllers/accounts_controller.py
index c7b5206..b3672cb 100644
--- a/erpnext/controllers/accounts_controller.py
+++ b/erpnext/controllers/accounts_controller.py
@@ -135,9 +135,9 @@
 			if not self.due_date:
 				frappe.throw(_("Due Date is mandatory"))
 
-			validate_due_date(self.posting_date, self.due_date, "Customer", self.customer)
+			validate_due_date(self.posting_date, self.due_date, "Customer", self.customer, self.company)
 		elif self.doctype == "Purchase Invoice":
-			validate_due_date(self.posting_date, self.due_date, "Supplier", self.supplier)
+			validate_due_date(self.posting_date, self.due_date, "Supplier", self.supplier, self.company)
 
 	def set_price_list_currency(self, buying_or_selling):
 		if self.meta.get_field("posting_date"):
diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index 8fa382c..3a18efc 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -183,7 +183,6 @@
 execute:frappe.db.sql("""delete from `tabProject Task`""")
 erpnext.patches.v5_0.update_item_desc_in_invoice
 erpnext.patches.v5_1.fix_against_account
-erpnext.patches.v5_1.fix_credit_days_based_on
 execute:frappe.rename_doc("DocType", "Salary Manager", "Process Payroll", force=True)
 erpnext.patches.v5_1.rename_roles
 erpnext.patches.v5_1.default_bom
@@ -487,3 +486,4 @@
 erpnext.patches.v10_0.set_numeric_ranges_in_template_if_blank
 erpnext.patches.v10_0.update_assessment_plan
 erpnext.patches.v10_0.update_assessment_result
+erpnext.patches.v10_0.set_default_payment_terms_based_on_company
\ No newline at end of file
diff --git a/erpnext/patches/v10_0/set_default_payment_terms_based_on_company.py b/erpnext/patches/v10_0/set_default_payment_terms_based_on_company.py
new file mode 100644
index 0000000..1b59633
--- /dev/null
+++ b/erpnext/patches/v10_0/set_default_payment_terms_based_on_company.py
@@ -0,0 +1,37 @@
+from __future__ import unicode_literals
+import frappe
+from erpnext.patches.v8_10.change_default_customer_credit_days import make_payment_term, make_template
+
+def execute():
+	for dt in ("Company", "Customer Group"):
+		frappe.reload_doc("setup", "doctype", frappe.scrub(dt))
+
+		credit_records = frappe.db.sql("""
+			SELECT DISTINCT `credit_days`, `credit_days_based_on`, `name`
+			from `tab{0}`
+			where
+				((credit_days_based_on='Fixed Days' or credit_days_based_on is null) and credit_days is not null)
+				or credit_days_based_on='Last Day of the Next Month'
+		""".format(dt), as_dict=1)
+
+		for d in credit_records:
+			template = create_payment_terms_template(d)
+
+			frappe.db.sql("""
+				update `tab{0}`
+				set `payment_terms` = %s
+				where name = %s
+			""".format(dt), (template, d.name))
+
+def create_payment_terms_template(data):
+	if data.credit_days_based_on == "Fixed Days":
+		pyt_template_name = 'Default Payment Term - N{0}'.format(data.credit_days)
+	else:
+		pyt_template_name = 'Default Payment Term - EO2M'
+
+	if not frappe.db.exists("Payment Terms Template", pyt_template_name):
+		payment_term = make_payment_term(data.credit_days, data.credit_days_based_on)
+		template = make_template(payment_term)
+	else:
+		template = frappe.get_doc("Payment Terms Template", pyt_template_name)
+	return template
\ No newline at end of file
diff --git a/erpnext/patches/v5_1/fix_credit_days_based_on.py b/erpnext/patches/v5_1/fix_credit_days_based_on.py
deleted file mode 100644
index 6df19f2..0000000
--- a/erpnext/patches/v5_1/fix_credit_days_based_on.py
+++ /dev/null
@@ -1,9 +0,0 @@
-from __future__ import unicode_literals
-
-import frappe
-
-def execute():
-	for dt in ("Customer", "Customer Group", "Company"):
-		frappe.reload_doctype(dt, force=True)
-		frappe.db.sql("""update `tab{0}` set credit_days_based_on='Fixed Days'
-			where ifnull(credit_days, 0) > 0""".format(dt))
diff --git a/erpnext/patches/v8_10/change_default_customer_credit_days.py b/erpnext/patches/v8_10/change_default_customer_credit_days.py
index 640c8aa..eddafb5 100644
--- a/erpnext/patches/v8_10/change_default_customer_credit_days.py
+++ b/erpnext/patches/v8_10/change_default_customer_credit_days.py
@@ -17,7 +17,8 @@
 			SELECT DISTINCT `credit_days`, `credit_days_based_on`, `name`
 			from `tab{0}`
 			where
-				(credit_days_based_on='Fixed Days' and credit_days is not null)
+				((credit_days_based_on='Fixed Days' or credit_days_based_on is null)
+					and credit_days is not null)
 				or credit_days_based_on='Last Day of the Next Month'
 		""".format(doctype))
 
diff --git a/erpnext/public/js/controllers/transaction.js b/erpnext/public/js/controllers/transaction.js
index d06a76a..31488de 100644
--- a/erpnext/public/js/controllers/transaction.js
+++ b/erpnext/public/js/controllers/transaction.js
@@ -523,7 +523,8 @@
 					},
 					callback: function(r, rt) {
 						if(r.message) {
-							me.frm.set_value("due_date", r.message);
+							me.frm.doc.due_date = r.message;
+							refresh_field("due_date");
 							frappe.ui.form.trigger(me.frm.doc.doctype, "currency");
 							me.recalculate_terms();
 						}
@@ -538,7 +539,7 @@
 	due_date: function() {
 		// due_date is to be changed, payment terms template and/or payment schedule must
 		// be removed as due_date is automatically changed based on payment terms
-		if (this.frm.doc.due_date) {
+		if (this.frm.doc.due_date && !this.frm.updating_party_details) {
 			if (this.frm.doc.payment_terms_template ||
 				(this.frm.doc.payment_schedule && this.frm.doc.payment_schedule.length)) {
 				var message1 = "";
@@ -555,11 +556,9 @@
 					if (message1.length !== 0) message2 = " and " + message2;
 					final_message = final_message + message2;
 				}
-
 				frappe.msgprint(final_message);
 			}
-
-	    }
+		}
 	},
 
 	recalculate_terms: function() {
diff --git a/erpnext/setup/doctype/company/company.json b/erpnext/setup/doctype/company/company.json
index 9824c70..d444417 100644
--- a/erpnext/setup/doctype/company/company.json
+++ b/erpnext/setup/doctype/company/company.json
@@ -1186,6 +1186,35 @@
    "bold": 0, 
    "collapsible": 0, 
    "columns": 0, 
+   "fieldname": "column_break_26", 
+   "fieldtype": "Column Break", 
+   "hidden": 0, 
+   "ignore_user_permissions": 0, 
+   "ignore_xss_filter": 0, 
+   "in_filter": 0, 
+   "in_global_search": 0, 
+   "in_list_view": 0, 
+   "in_standard_filter": 0, 
+   "length": 0, 
+   "no_copy": 0, 
+   "permlevel": 0, 
+   "precision": "", 
+   "print_hide": 0, 
+   "print_hide_if_no_value": 0, 
+   "read_only": 0, 
+   "remember_last_selected_value": 0, 
+   "report_hide": 0, 
+   "reqd": 0, 
+   "search_index": 0, 
+   "set_only_once": 0, 
+   "unique": 0
+  }, 
+  {
+   "allow_bulk_edit": 0, 
+   "allow_on_submit": 0, 
+   "bold": 0, 
+   "collapsible": 0, 
+   "columns": 0, 
    "depends_on": "eval:!doc.__islocal", 
    "fieldname": "credit_limit", 
    "fieldtype": "Currency", 
@@ -1219,8 +1248,9 @@
    "bold": 0, 
    "collapsible": 0, 
    "columns": 0, 
-   "fieldname": "column_break_26", 
-   "fieldtype": "Column Break", 
+   "depends_on": "", 
+   "fieldname": "payment_terms", 
+   "fieldtype": "Link", 
    "hidden": 0, 
    "ignore_user_permissions": 0, 
    "ignore_xss_filter": 0, 
@@ -1228,8 +1258,10 @@
    "in_global_search": 0, 
    "in_list_view": 0, 
    "in_standard_filter": 0, 
+   "label": "Default Payment Terms Template", 
    "length": 0, 
    "no_copy": 0, 
+   "options": "Payment Terms Template", 
    "permlevel": 0, 
    "precision": "", 
    "print_hide": 0, 
@@ -1248,69 +1280,6 @@
    "bold": 0, 
    "collapsible": 0, 
    "columns": 0, 
-   "fieldname": "credit_days_based_on", 
-   "fieldtype": "Select", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 0, 
-   "in_standard_filter": 0, 
-   "label": "Credit Days Based On", 
-   "length": 0, 
-   "no_copy": 0, 
-   "options": "\nFixed Days\nLast Day of the Next Month", 
-   "permlevel": 0, 
-   "precision": "", 
-   "print_hide": 0, 
-   "print_hide_if_no_value": 0, 
-   "read_only": 0, 
-   "remember_last_selected_value": 0, 
-   "report_hide": 0, 
-   "reqd": 0, 
-   "search_index": 0, 
-   "set_only_once": 0, 
-   "unique": 0
-  }, 
-  {
-   "allow_bulk_edit": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "depends_on": "eval:(!doc.__islocal && doc.credit_days_based_on=='Fixed Days')", 
-   "fieldname": "credit_days", 
-   "fieldtype": "Int", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 0, 
-   "in_standard_filter": 0, 
-   "label": "Credit Days", 
-   "length": 0, 
-   "no_copy": 0, 
-   "oldfieldname": "credit_days", 
-   "oldfieldtype": "Int", 
-   "permlevel": 0, 
-   "print_hide": 0, 
-   "print_hide_if_no_value": 0, 
-   "read_only": 0, 
-   "remember_last_selected_value": 0, 
-   "report_hide": 0, 
-   "reqd": 0, 
-   "search_index": 0, 
-   "set_only_once": 0, 
-   "unique": 0
-  }, 
-  {
-   "allow_bulk_edit": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
    "depends_on": "eval:!doc.__islocal", 
    "fieldname": "auto_accounting_for_stock_settings", 
    "fieldtype": "Section Break", 
@@ -2052,7 +2021,7 @@
  "istable": 0, 
  "max_attachments": 0, 
  "menu_index": 0, 
- "modified": "2017-12-07 18:40:24.646920", 
+ "modified": "2018-01-29 12:40:24.646920", 
  "modified_by": "Administrator", 
  "module": "Setup", 
  "name": "Company", 
diff --git a/erpnext/setup/doctype/customer_group/customer_group.json b/erpnext/setup/doctype/customer_group/customer_group.json
index 316f11b..062a49a 100644
--- a/erpnext/setup/doctype/customer_group/customer_group.json
+++ b/erpnext/setup/doctype/customer_group/customer_group.json
@@ -162,12 +162,14 @@
    "unique": 0
   }, 
   {
+   "allow_bulk_edit": 0, 
    "allow_on_submit": 0, 
    "bold": 0, 
    "collapsible": 0, 
    "columns": 0, 
-   "fieldname": "credit_days_based_on", 
-   "fieldtype": "Select", 
+   "depends_on": "", 
+   "fieldname": "payment_terms", 
+   "fieldtype": "Link", 
    "hidden": 0, 
    "ignore_user_permissions": 0, 
    "ignore_xss_filter": 0, 
@@ -175,10 +177,10 @@
    "in_global_search": 0, 
    "in_list_view": 0, 
    "in_standard_filter": 0, 
-   "label": "Credit Days Based On", 
+   "label": "Default Payment Terms Template", 
    "length": 0, 
    "no_copy": 0, 
-   "options": "\nFixed Days\nLast Day of the Next Month", 
+   "options": "Payment Terms Template", 
    "permlevel": 0, 
    "precision": "", 
    "print_hide": 0, 
@@ -196,35 +198,6 @@
    "bold": 0, 
    "collapsible": 0, 
    "columns": 0, 
-   "depends_on": "eval:doc.credit_days_based_on=='Fixed Days'", 
-   "fieldname": "credit_days", 
-   "fieldtype": "Int", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 0, 
-   "in_standard_filter": 0, 
-   "label": "Credit Days", 
-   "length": 0, 
-   "no_copy": 0, 
-   "permlevel": 1, 
-   "print_hide": 0, 
-   "print_hide_if_no_value": 0, 
-   "read_only": 0, 
-   "remember_last_selected_value": 0, 
-   "report_hide": 0, 
-   "reqd": 0, 
-   "search_index": 0, 
-   "set_only_once": 0, 
-   "unique": 0
-  }, 
-  {
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
    "fieldname": "credit_limit", 
    "fieldtype": "Currency", 
    "hidden": 0, 
@@ -411,7 +384,7 @@
  "issingle": 0, 
  "istable": 0, 
  "max_attachments": 0, 
- "modified": "2017-02-20 13:25:31.549874", 
+ "modified": "2018-01-29 13:25:31.549874", 
  "modified_by": "Administrator", 
  "module": "Setup", 
  "name": "Customer Group",