# Copyright (c) 2015, Frappe Technologies Pvt. Ltd.
# License: GNU General Public License v3. See license.txt

from __future__ import unicode_literals
import frappe, erpnext
from frappe import _, scrub
from frappe.utils import getdate, nowdate, flt, cint, formatdate, cstr, now, time_diff_in_seconds
from collections import OrderedDict
from erpnext.accounts.utils import get_currency_precision
from erpnext.accounts.doctype.accounting_dimension.accounting_dimension import get_accounting_dimensions, get_dimension_with_children

#  This report gives a summary of all Outstanding Invoices considering the following

#  1. Invoice can be booked via Sales/Purchase Invoice or Journal Entry
#  2. Report handles both receivable and payable
#  3. Key balances for each row are "Invoiced Amount", "Paid Amount", "Credit/Debit Note Amount", "Oustanding Amount"
#  4. For explicit payment terms in invoice (example: 30% advance, 30% on delivery, 40% post delivery),
#     the invoice will be broken up into multiple rows, one for each payment term
#  5. If there are payments after the report date (post dated), these will be updated in additional columns
#     for future amount
#  6. Configurable Ageing Groups (0-30, 30-60 etc) can be set via filters
#  7. For overpayment against an invoice with payment terms, there will be an additional row
#  8. Invoice details like Sales Persons, Delivery Notes are also fetched comma separated
#  9. Report amounts are in "Party Currency" if party is selected, or company currency for multi-party
# 10. This reports is based on all GL Entries that are made against account_type "Receivable" or "Payable"

def execute(filters=None):
	args = {
		"party_type": "Customer",
		"naming_by": ["Selling Settings", "cust_master_name"],
	}
	return ReceivablePayableReport(filters).run(args)

class ReceivablePayableReport(object):
	def __init__(self, filters=None):
		self.filters = frappe._dict(filters or {})
		self.filters.report_date = getdate(self.filters.report_date or nowdate())
		self.age_as_on = getdate(nowdate()) \
			if self.filters.report_date > getdate(nowdate()) \
			else self.filters.report_date

	def run(self, args):
		self.filters.update(args)
		self.set_defaults()
		self.party_naming_by = frappe.db.get_value(args.get("naming_by")[0], None, args.get("naming_by")[1])
		self.get_columns()
		self.get_data()
		self.get_chart_data()
		return self.columns, self.data, None, self.chart, None, self.skip_total_row

	def set_defaults(self):
		if not self.filters.get("company"):
			self.filters.company = frappe.db.get_single_value('Global Defaults', 'default_company')
		self.company_currency = frappe.get_cached_value('Company',  self.filters.get("company"), "default_currency")
		self.currency_precision = get_currency_precision() or 2
		self.dr_or_cr = "debit" if self.filters.party_type == "Customer" else "credit"
		self.party_type = self.filters.party_type
		self.party_details = {}
		self.invoices = set()
		self.skip_total_row = 0

		if self.filters.get('group_by_party'):
			self.previous_party=''
			self.total_row_map = {}
			self.skip_total_row = 1

	def get_data(self):
		self.get_gl_entries()
		self.get_sales_invoices_or_customers_based_on_sales_person()
		self.voucher_balance = OrderedDict()
		self.init_voucher_balance() # invoiced, paid, credit_note, outstanding

		# Build delivery note map against all sales invoices
		self.build_delivery_note_map()

		# Get invoice details like bill_no, due_date etc for all invoices
		self.get_invoice_details()

		# fetch future payments against invoices
		self.get_future_payments()

		# Get return entries
		self.get_return_entries()

		self.data = []
		for gle in self.gl_entries:
			self.update_voucher_balance(gle)

		self.build_data()

	def init_voucher_balance(self):
		# build all keys, since we want to exclude vouchers beyond the report date
		for gle in self.gl_entries:
			# get the balance object for voucher_type
			key = (gle.voucher_type, gle.voucher_no, gle.party)
			if not key in self.voucher_balance:
				self.voucher_balance[key] = frappe._dict(
					voucher_type = gle.voucher_type,
					voucher_no = gle.voucher_no,
					party = gle.party,
					posting_date = gle.posting_date,
					remarks = gle.remarks,
					account_currency = gle.account_currency,
					invoiced = 0.0,
					paid = 0.0,
					credit_note = 0.0,
					outstanding = 0.0
				)
			self.get_invoices(gle)

			if self.filters.get('group_by_party'):
				self.init_subtotal_row(gle.party)

		if self.filters.get('group_by_party'):
			self.init_subtotal_row('Total')

	def get_invoices(self, gle):
		if gle.voucher_type in ('Sales Invoice', 'Purchase Invoice'):
			if self.filters.get("sales_person"):
				if gle.voucher_no in self.sales_person_records.get("Sales Invoice", []) \
					or gle.party in self.sales_person_records.get("Customer", []):
						self.invoices.add(gle.voucher_no)
			else:
				self.invoices.add(gle.voucher_no)

	def init_subtotal_row(self, party):
		if not self.total_row_map.get(party):
			self.total_row_map.setdefault(party, {
				'party': party,
				'bold': 1
			})

			for field in self.get_currency_fields():
				self.total_row_map[party][field] = 0.0

	def get_currency_fields(self):
		return ['invoiced', 'paid', 'credit_note', 'outstanding', 'range1',
			'range2', 'range3', 'range4', 'range5']

	def update_voucher_balance(self, gle):
		# get the row where this balance needs to be updated
		# if its a payment, it will return the linked invoice or will be considered as advance
		row = self.get_voucher_balance(gle)
		if not row: return
		# gle_balance will be the total "debit - credit" for receivable type reports and
		# and vice-versa for payable type reports
		gle_balance = self.get_gle_balance(gle)
		if gle_balance > 0:
			if gle.voucher_type in ('Journal Entry', 'Payment Entry') and gle.against_voucher:
				# debit against sales / purchase invoice
				row.paid -= gle_balance
			else:
				# invoice
				row.invoiced += gle_balance
		else:
			# payment or credit note for receivables
			if self.is_invoice(gle):
				# stand alone debit / credit note
				row.credit_note -= gle_balance
			else:
				# advance / unlinked payment or other adjustment
				row.paid -= gle_balance

	def update_sub_total_row(self, row, party):
		total_row = self.total_row_map.get(party)

		for field in self.get_currency_fields():
			total_row[field] += row.get(field, 0.0)

	def append_subtotal_row(self, party):
		sub_total_row = self.total_row_map.get(party)

		if sub_total_row:
			self.data.append(sub_total_row)
			self.data.append({})
			self.update_sub_total_row(sub_total_row, 'Total')

	def get_voucher_balance(self, gle):
		if self.filters.get("sales_person"):
			against_voucher = gle.against_voucher or gle.voucher_no
			if not (gle.party in self.sales_person_records.get("Customer", []) or \
				against_voucher in self.sales_person_records.get("Sales Invoice", [])):
					return

		voucher_balance = None
		if gle.against_voucher:
			# find invoice
			against_voucher = gle.against_voucher

			# If payment is made against credit note
			# and credit note is made against a Sales Invoice
			# then consider the payment against original sales invoice.
			if gle.against_voucher_type in ('Sales Invoice', 'Purchase Invoice'):
				if gle.against_voucher in self.return_entries:
					return_against = self.return_entries.get(gle.against_voucher)
					if return_against:
						against_voucher = return_against

			voucher_balance = self.voucher_balance.get((gle.against_voucher_type, against_voucher, gle.party))

		if not voucher_balance:
			# no invoice, this is an invoice / stand-alone payment / credit note
			voucher_balance = self.voucher_balance.get((gle.voucher_type, gle.voucher_no, gle.party))

		return voucher_balance

	def build_data(self):
		# set outstanding for all the accumulated balances
		# as we can use this to filter out invoices without outstanding
		for key, row in self.voucher_balance.items():
			row.outstanding = flt(row.invoiced - row.paid - row.credit_note, self.currency_precision)
			row.invoice_grand_total = row.invoiced

			if abs(row.outstanding) > 1.0/10 ** self.currency_precision:
				# non-zero oustanding, we must consider this row

				if self.is_invoice(row) and self.filters.based_on_payment_terms:
					# is an invoice, allocate based on fifo
					# adds a list `payment_terms` which contains new rows for each term
					self.allocate_outstanding_based_on_payment_terms(row)

					if row.payment_terms:
						# make separate rows for each payment term
						for d in row.payment_terms:
							if d.outstanding > 0:
								self.append_row(d)

						# if there is overpayment, add another row
						self.allocate_extra_payments_or_credits(row)
					else:
						self.append_row(row)
				else:
					self.append_row(row)

		if self.filters.get('group_by_party'):
			self.append_subtotal_row(self.previous_party)
			if self.data:
				self.data.append(self.total_row_map.get('Total'))

	def append_row(self, row):
		self.allocate_future_payments(row)
		self.set_invoice_details(row)
		self.set_party_details(row)
		self.set_ageing(row)

		if self.filters.get('group_by_party'):
			self.update_sub_total_row(row, row.party)
			if self.previous_party and (self.previous_party != row.party):
				self.append_subtotal_row(self.previous_party)
			self.previous_party = row.party

		self.data.append(row)

	def set_invoice_details(self, row):
		invoice_details = self.invoice_details.get(row.voucher_no, {})
		if row.due_date:
			invoice_details.pop("due_date", None)
		row.update(invoice_details)

		if row.voucher_type == 'Sales Invoice':
			if self.filters.show_delivery_notes:
				self.set_delivery_notes(row)

			if self.filters.show_sales_person and row.sales_team:
				row.sales_person = ", ".join(row.sales_team)
				del row['sales_team']

	def set_delivery_notes(self, row):
		delivery_notes = self.delivery_notes.get(row.voucher_no, [])
		if delivery_notes:
			row.delivery_notes = ', '.join(delivery_notes)

	def build_delivery_note_map(self):
		if self.invoices and self.filters.show_delivery_notes:
			self.delivery_notes = frappe._dict()

			# delivery note link inside sales invoice
			si_against_dn = frappe.db.sql("""
				select parent, delivery_note
				from `tabSales Invoice Item`
				where docstatus=1 and parent in (%s)
			""" % (','.join(['%s'] * len(self.invoices))), tuple(self.invoices), as_dict=1)

			for d in si_against_dn:
				if d.delivery_note:
					self.delivery_notes.setdefault(d.parent, set()).add(d.delivery_note)

			dn_against_si = frappe.db.sql("""
				select distinct parent, against_sales_invoice
				from `tabDelivery Note Item`
				where against_sales_invoice in (%s)
			""" % (','.join(['%s'] * len(self.invoices))), tuple(self.invoices) , as_dict=1)

			for d in dn_against_si:
				self.delivery_notes.setdefault(d.against_sales_invoice, set()).add(d.parent)

	def get_invoice_details(self):
		self.invoice_details = frappe._dict()
		if self.party_type == "Customer":
			si_list = frappe.db.sql("""
				select name, due_date, po_no
				from `tabSales Invoice`
				where posting_date <= %s
			""",self.filters.report_date, as_dict=1)
			for d in si_list:
				self.invoice_details.setdefault(d.name, d)

			# Get Sales Team
			if self.filters.show_sales_person:
				sales_team = frappe.db.sql("""
					select parent, sales_person
					from `tabSales Team`
					where parenttype = 'Sales Invoice'
				""", as_dict=1)
				for d in sales_team:
					self.invoice_details.setdefault(d.parent, {})\
						.setdefault('sales_team', []).append(d.sales_person)

		if self.party_type == "Supplier":
			for pi in frappe.db.sql("""
				select name, due_date, bill_no, bill_date
				from `tabPurchase Invoice`
				where posting_date <= %s
			""", self.filters.report_date, as_dict=1):
				self.invoice_details.setdefault(pi.name, pi)

		# Invoices booked via Journal Entries
		journal_entries = frappe.db.sql("""
			select name, due_date, bill_no, bill_date
			from `tabJournal Entry`
			where posting_date <= %s
		""", self.filters.report_date, as_dict=1)

		for je in journal_entries:
			if je.bill_no:
				self.invoice_details.setdefault(je.name, je)

	def set_party_details(self, row):
		# customer / supplier name
		party_details = self.get_party_details(row.party) or {}
		row.update(party_details)
		if self.filters.get(scrub(self.filters.party_type)):
			row.currency = row.account_currency
		else:
			row.currency = self.company_currency

	def allocate_outstanding_based_on_payment_terms(self, row):
		self.get_payment_terms(row)
		for term in row.payment_terms:

			# update "paid" and "oustanding" for this term
			if not term.paid:
				self.allocate_closing_to_term(row, term, 'paid')

			# update "credit_note" and "oustanding" for this term
			if term.outstanding:
				self.allocate_closing_to_term(row, term, 'credit_note')

		row.payment_terms = sorted(row.payment_terms, key=lambda x: x['due_date'])

	def get_payment_terms(self, row):
		# build payment_terms for row
		payment_terms_details = frappe.db.sql("""
			select
				si.name, si.party_account_currency, si.currency, si.conversion_rate,
				ps.due_date, ps.payment_amount, ps.description, ps.paid_amount
			from `tab{0}` si, `tabPayment Schedule` ps
			where
				si.name = ps.parent and
				si.name = %s
			order by ps.paid_amount desc, due_date
		""".format(row.voucher_type), row.voucher_no, as_dict = 1)


		original_row = frappe._dict(row)
		row.payment_terms = []

		# If no or single payment terms, no need to split the row
		if len(payment_terms_details) <= 1:
			return

		for d in payment_terms_details:
			term = frappe._dict(original_row)
			self.append_payment_term(row, d, term)

	def append_payment_term(self, row, d, term):
		if (self.filters.get("customer") or self.filters.get("supplier")) and d.currency == d.party_account_currency:
			invoiced = d.payment_amount
		else:
			invoiced = flt(flt(d.payment_amount) * flt(d.conversion_rate), self.currency_precision)

		row.payment_terms.append(term.update({
			"due_date": d.due_date,
			"invoiced": invoiced,
			"invoice_grand_total": row.invoiced,
			"payment_term": d.description,
			"paid": d.paid_amount,
			"credit_note": 0.0,
			"outstanding": invoiced - d.paid_amount
		}))

		if d.paid_amount:
			row['paid'] -= d.paid_amount

	def allocate_closing_to_term(self, row, term, key):
		if row[key]:
			if row[key] > term.outstanding:
				term[key] = term.outstanding
				row[key] -= term.outstanding
			else:
				term[key] = row[key]
				row[key] = 0
		term.outstanding -= term[key]

	def allocate_extra_payments_or_credits(self, row):
		# allocate extra payments / credits
		additional_row = None
		for key in ('paid', 'credit_note'):
			if row[key] > 0:
				if not additional_row:
					additional_row = frappe._dict(row)
				additional_row.invoiced = 0.0
				additional_row[key] = row[key]

		if additional_row:
			additional_row.outstanding = additional_row.invoiced - additional_row.paid - additional_row.credit_note
			self.append_row(additional_row)

	def get_future_payments(self):
		if self.filters.show_future_payments:
			self.future_payments = frappe._dict()
			future_payments = list(self.get_future_payments_from_payment_entry())
			future_payments += list(self.get_future_payments_from_journal_entry())
			if future_payments:
				for d in future_payments:
					if d.future_amount and d.invoice_no:
						self.future_payments.setdefault((d.invoice_no, d.party), []).append(d)

	def get_future_payments_from_payment_entry(self):
		return frappe.db.sql("""
			select
				ref.reference_name as invoice_no,
				payment_entry.party,
				payment_entry.party_type,
				payment_entry.posting_date as future_date,
				ref.allocated_amount as future_amount,
				payment_entry.reference_no as future_ref
			from
				`tabPayment Entry` as payment_entry inner join `tabPayment Entry Reference` as ref
			on
				(ref.parent = payment_entry.name)
			where
				payment_entry.docstatus < 2
				and payment_entry.posting_date > %s
				and payment_entry.party_type = %s
			""", (self.filters.report_date, self.party_type), as_dict=1)

	def get_future_payments_from_journal_entry(self):
		if self.filters.get('party'):
			amount_field = ("jea.debit_in_account_currency - jea.credit_in_account_currency"
				if self.party_type == 'Supplier' else "jea.credit_in_account_currency - jea.debit_in_account_currency")
		else:
			amount_field = ("jea.debit - " if self.party_type == 'Supplier' else "jea.credit")

		return frappe.db.sql("""
			select
				jea.reference_name as invoice_no,
				jea.party,
				jea.party_type,
				je.posting_date as future_date,
				sum({0}) as future_amount,
				je.cheque_no as future_ref
			from
				`tabJournal Entry` as je inner join `tabJournal Entry Account` as jea
			on
				(jea.parent = je.name)
			where
				je.docstatus < 2
				and je.posting_date > %s
				and jea.party_type = %s
				and jea.reference_name is not null and jea.reference_name != ''
			group by je.name, jea.reference_name
			having future_amount > 0
			""".format(amount_field), (self.filters.report_date, self.party_type), as_dict=1)

	def allocate_future_payments(self, row):
		# future payments are captured in additional columns
		# this method allocates pending future payments against a voucher to
		# the current row (which could be generated from payment terms)
		if not self.filters.show_future_payments:
			return

		row.remaining_balance = row.outstanding
		row.future_amount = 0.0
		for future in self.future_payments.get((row.voucher_no, row.party), []):
			if row.remaining_balance > 0 and future.future_amount:
				if future.future_amount > row.outstanding:
					row.future_amount = row.outstanding
					future.future_amount = future.future_amount - row.outstanding
					row.remaining_balance = 0
				else:
					row.future_amount += future.future_amount
					future.future_amount = 0
					row.remaining_balance = row.outstanding - row.future_amount

				row.setdefault('future_ref', []).append(cstr(future.future_ref) + '/' + cstr(future.future_date))

		if row.future_ref:
			row.future_ref = ', '.join(row.future_ref)

	def get_return_entries(self):
		doctype = "Sales Invoice" if self.party_type == "Customer" else "Purchase Invoice"
		filters={
			'is_return': 1,
			'docstatus': 1
		}
		party_field = scrub(self.filters.party_type)
		if self.filters.get(party_field):
			filters.update({party_field: self.filters.get(party_field)})
		self.return_entries = frappe._dict(
			frappe.get_all(doctype, filters, ['name', 'return_against'], as_list=1)
		)

	def set_ageing(self, row):
		if self.filters.ageing_based_on == "Due Date":
			entry_date = row.due_date
		elif self.filters.ageing_based_on == "Supplier Invoice Date":
			entry_date = row.bill_date
		else:
			entry_date = row.posting_date

		self.get_ageing_data(entry_date, row)

		# ageing buckets should not have amounts if due date is not reached
		if getdate(entry_date) > getdate(self.filters.report_date):
			row.range1 = row.range2 = row.range3 = row.range4 = row.range5 = 0.0

	def get_ageing_data(self, entry_date, row):
		# [0-30, 30-60, 60-90, 90-120, 120-above]
		row.range1 = row.range2 = row.range3 = row.range4 = row.range5 = 0.0

		if not (self.age_as_on and entry_date):
			return

		row.age = (getdate(self.age_as_on) - getdate(entry_date)).days or 0
		index = None

		if not (self.filters.range1 and self.filters.range2 and self.filters.range3 and self.filters.range4):
			self.filters.range1, self.filters.range2, self.filters.range3, self.filters.range4 = 30, 60, 90, 120

		for i, days in enumerate([self.filters.range1, self.filters.range2, self.filters.range3, self.filters.range4]):
			if cint(row.age) <= cint(days):
				index = i
				break

		if index is None: index = 4
		row['range' + str(index+1)] = row.outstanding

	def get_gl_entries(self):
		# get all the GL entries filtered by the given filters

		conditions, values = self.prepare_conditions()
		order_by = self.get_order_by_condition()

		if self.filters.show_future_payments:
			values.insert(2, self.filters.report_date)

			date_condition = """AND (posting_date <= %s
				OR (against_voucher IS NULL AND DATE(creation) <= %s))"""
		else:
			date_condition = "AND posting_date <=%s"

		if self.filters.get(scrub(self.party_type)):
			select_fields = "debit_in_account_currency as debit, credit_in_account_currency as credit"
		else:
			select_fields = "debit, credit"

		self.gl_entries = frappe.db.sql("""
			select
				name, posting_date, account, party_type, party, voucher_type, voucher_no,
				against_voucher_type, against_voucher, account_currency, remarks, {0}
			from
				`tabGL Entry`
			where
				docstatus < 2
				and party_type=%s
				and (party is not null and party != '')
				{1} {2} {3}"""
			.format(select_fields, date_condition, conditions, order_by), values, as_dict=True)

	def get_sales_invoices_or_customers_based_on_sales_person(self):
		if self.filters.get("sales_person"):
			lft, rgt = frappe.db.get_value("Sales Person",
				self.filters.get("sales_person"), ["lft", "rgt"])

			records = frappe.db.sql("""
				select distinct parent, parenttype
				from `tabSales Team` steam
				where parenttype in ('Customer', 'Sales Invoice')
					and exists(select name from `tabSales Person` where lft >= %s and rgt <= %s and name = steam.sales_person)
			""", (lft, rgt), as_dict=1)

			self.sales_person_records = frappe._dict()
			for d in records:
				self.sales_person_records.setdefault(d.parenttype, set()).add(d.parent)

	def prepare_conditions(self):
		conditions = [""]
		values = [self.party_type, self.filters.report_date]
		party_type_field = scrub(self.party_type)

		self.add_common_filters(conditions, values, party_type_field)

		if party_type_field=="customer":
			self.add_customer_filters(conditions, values)

		elif party_type_field=="supplier":
			self.add_supplier_filters(conditions, values)

		self.add_accounting_dimensions_filters(conditions, values)
		return " and ".join(conditions), values

	def get_order_by_condition(self):
		if self.filters.get('group_by_party'):
			return "order by party, posting_date"
		else:
			return "order by posting_date, party"

	def add_common_filters(self, conditions, values, party_type_field):
		if self.filters.company:
			conditions.append("company=%s")
			values.append(self.filters.company)

		if self.filters.finance_book:
			conditions.append("ifnull(finance_book, '') in (%s, '')")
			values.append(self.filters.finance_book)

		if self.filters.get(party_type_field):
			conditions.append("party=%s")
			values.append(self.filters.get(party_type_field))

		# get GL with "receivable" or "payable" account_type
		account_type = "Receivable" if self.party_type == "Customer" else "Payable"
		accounts = [d.name for d in frappe.get_all("Account",
			filters={"account_type": account_type, "company": self.filters.company})]

		if accounts:
			conditions.append("account in (%s)" % ','.join(['%s'] *len(accounts)))
			values += accounts

	def add_customer_filters(self, conditions, values):
		if self.filters.get("customer_group"):
			conditions.append(self.get_hierarchical_filters('Customer Group', 'customer_group'))

		if self.filters.get("territory"):
			conditions.append(self.get_hierarchical_filters('Territory', 'territory'))

		if self.filters.get("payment_terms_template"):
			conditions.append("party in (select name from tabCustomer where payment_terms=%s)")
			values.append(self.filters.get("payment_terms_template"))

		if self.filters.get("sales_partner"):
			conditions.append("party in (select name from tabCustomer where default_sales_partner=%s)")
			values.append(self.filters.get("sales_partner"))

	def add_supplier_filters(self, conditions, values):
		if self.filters.get("supplier_group"):
			conditions.append("""party in (select name from tabSupplier
				where supplier_group=%s)""")
			values.append(self.filters.get("supplier_group"))

		if self.filters.get("payment_terms_template"):
			conditions.append("party in (select name from tabSupplier where payment_terms=%s)")
			values.append(self.filters.get("payment_terms_template"))

	def get_hierarchical_filters(self, doctype, key):
		lft, rgt = frappe.db.get_value(doctype, self.filters.get(key), ["lft", "rgt"])

		return """party in (select name from tabCustomer
			where exists(select name from `tab{doctype}` where lft >= {lft} and rgt <= {rgt}
				and name=tabCustomer.{key}))""".format(
					doctype=doctype, lft=lft, rgt=rgt, key=key)

	def add_accounting_dimensions_filters(self, conditions, values):
		accounting_dimensions = get_accounting_dimensions(as_list=False)

		if accounting_dimensions:
			for dimension in accounting_dimensions:
				if self.filters.get(dimension.fieldname):
					if frappe.get_cached_value('DocType', dimension.document_type, 'is_tree'):
						self.filters[dimension.fieldname] = get_dimension_with_children(dimension.document_type,
							self.filters.get(dimension.fieldname))
					conditions.append("{0} in %s".format(dimension.fieldname))
					values.append(tuple(self.filters.get(dimension.fieldname)))

	def get_gle_balance(self, gle):
		# get the balance of the GL (debit - credit) or reverse balance based on report type
		return gle.get(self.dr_or_cr) - self.get_reverse_balance(gle)

	def get_reverse_balance(self, gle):
		# get "credit" balance if report type is "debit" and vice versa
		return gle.get('debit' if self.dr_or_cr=='credit' else 'credit')

	def is_invoice(self, gle):
		if gle.voucher_type in ('Sales Invoice', 'Purchase Invoice'):
			return True

	def get_party_details(self, party):
		if not party in self.party_details:
			if self.party_type == 'Customer':
				self.party_details[party] = frappe.db.get_value('Customer', party, ['customer_name',
					'territory', 'customer_group', 'customer_primary_contact'], as_dict=True)
			else:
				self.party_details[party] = frappe.db.get_value('Supplier', party, ['supplier_name',
					'supplier_group'], as_dict=True)

		return self.party_details[party]


	def get_columns(self):
		self.columns = []
		self.add_column('Posting Date', fieldtype='Date')
		self.add_column(label=_(self.party_type), fieldname='party',
			fieldtype='Link', options=self.party_type, width=180)

		if self.party_naming_by == "Naming Series":
			self.add_column(_('{0} Name').format(self.party_type),
				fieldname = scrub(self.party_type) + '_name', fieldtype='Data')

		if self.party_type == 'Customer':
			self.add_column(_("Customer Contact"), fieldname='customer_primary_contact',
				fieldtype='Link', options='Contact')

		self.add_column(label=_('Voucher Type'), fieldname='voucher_type', fieldtype='Data')
		self.add_column(label=_('Voucher No'), fieldname='voucher_no', fieldtype='Dynamic Link',
			options='voucher_type', width=180)
		self.add_column(label='Due Date', fieldtype='Date')

		if self.party_type == "Supplier":
			self.add_column(label=_('Bill No'), fieldname='bill_no', fieldtype='Data')
			self.add_column(label=_('Bill Date'), fieldname='bill_date', fieldtype='Date')

		if self.filters.based_on_payment_terms:
			self.add_column(label=_('Payment Term'), fieldname='payment_term', fieldtype='Data')
			self.add_column(label=_('Invoice Grand Total'), fieldname='invoice_grand_total')

		self.add_column(_('Invoiced Amount'), fieldname='invoiced')
		self.add_column(_('Paid Amount'), fieldname='paid')
		if self.party_type == "Customer":
			self.add_column(_('Credit Note'), fieldname='credit_note')
		else:
			# note: fieldname is still `credit_note`
			self.add_column(_('Debit Note'), fieldname='credit_note')
		self.add_column(_('Outstanding Amount'), fieldname='outstanding')

		self.setup_ageing_columns()

		self.add_column(label=_('Currency'), fieldname='currency', fieldtype='Link', options='Currency', width=80)

		if self.filters.show_future_payments:
			self.add_column(label=_('Future Payment Ref'), fieldname='future_ref', fieldtype='Data')
			self.add_column(label=_('Future Payment Amount'), fieldname='future_amount')
			self.add_column(label=_('Remaining Balance'), fieldname='remaining_balance')

		if self.filters.party_type == 'Customer':
			self.add_column(label=_('Customer LPO'), fieldname='po_no', fieldtype='Data')

			# comma separated list of linked delivery notes
			if self.filters.show_delivery_notes:
				self.add_column(label=_('Delivery Notes'), fieldname='delivery_notes', fieldtype='Data')
			self.add_column(label=_('Territory'), fieldname='territory', fieldtype='Link',
				options='Territory')
			self.add_column(label=_('Customer Group'), fieldname='customer_group', fieldtype='Link',
				options='Customer Group')
			if self.filters.show_sales_person:
				self.add_column(label=_('Sales Person'), fieldname='sales_person', fieldtype='Data')

		if self.filters.party_type == "Supplier":
			self.add_column(label=_('Supplier Group'), fieldname='supplier_group', fieldtype='Link',
				options='Supplier Group')

		self.add_column(label=_('Remarks'), fieldname='remarks', fieldtype='Text', width=200)

	def add_column(self, label, fieldname=None, fieldtype='Currency', options=None, width=120):
		if not fieldname: fieldname = scrub(label)
		if fieldtype=='Currency': options='currency'
		if fieldtype=='Date': width = 90

		self.columns.append(dict(
			label=label,
			fieldname=fieldname,
			fieldtype=fieldtype,
			options=options,
			width=width
		))

	def setup_ageing_columns(self):
		# for charts
		self.ageing_column_labels = []
		self.add_column(label=_('Age (Days)'), fieldname='age', fieldtype='Int', width=80)

		for i, label in enumerate(["0-{range1}".format(range1=self.filters["range1"]),
			"{range1}-{range2}".format(range1=cint(self.filters["range1"])+ 1, range2=self.filters["range2"]),
			"{range2}-{range3}".format(range2=cint(self.filters["range2"])+ 1, range3=self.filters["range3"]),
			"{range3}-{range4}".format(range3=cint(self.filters["range3"])+ 1, range4=self.filters["range4"]),
			"{range4}-{above}".format(range4=cint(self.filters["range4"])+ 1, above=_("Above"))]):
				self.add_column(label=label, fieldname='range' + str(i+1))
				self.ageing_column_labels.append(label)

	def get_chart_data(self):
		rows = []
		for row in self.data:
			row = frappe._dict(row)
			if not cint(row.bold):
				values = [row.range1, row.range2, row.range3, row.range4, row.range5]
				precision = cint(frappe.db.get_default("float_precision")) or 2
				rows.append({
					'values': [flt(val, precision) for val in values]
				})

		self.chart = {
			"data": {
				'labels': self.ageing_column_labels,
				'datasets': rows
			},
			"type": 'percentage'
		}
