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

from __future__ import unicode_literals
import frappe
from frappe.utils import flt
from frappe import msgprint, _

def execute(filters=None):
	if not filters: filters = {}

	invoice_list = get_invoices(filters)
	columns, income_accounts, tax_accounts = get_columns(invoice_list)

	if not invoice_list:
		msgprint(_("No record found"))
		return columns, invoice_list

	invoice_income_map = get_invoice_income_map(invoice_list)
	invoice_income_map, invoice_tax_map = get_invoice_tax_map(invoice_list,
		invoice_income_map, income_accounts)

	invoice_so_dn_map = get_invoice_so_dn_map(invoice_list)
	customer_map = get_customer_deatils(invoice_list)

	data = []
	for inv in invoice_list:
		# invoice details
		sales_order = list(set(invoice_so_dn_map.get(inv.name, {}).get("sales_order", [])))
		delivery_note = list(set(invoice_so_dn_map.get(inv.name, {}).get("delivery_note", [])))

		row = [inv.name, inv.posting_date, inv.customer, inv.customer_name,
		customer_map.get(inv.customer)["customer_group"], customer_map.get(inv.customer)["territory"],
		inv.debit_to, inv.project_name, inv.remarks, ", ".join(sales_order), ", ".join(delivery_note)]

		# map income values
		base_net_total = 0
		for income_acc in income_accounts:
			income_amount = flt(invoice_income_map.get(inv.name, {}).get(income_acc))
			base_net_total += income_amount
			row.append(income_amount)

		# net total
		row.append(base_net_total or inv.base_net_total)

		# tax account
		total_tax = 0
		for tax_acc in tax_accounts:
			if tax_acc not in income_accounts:
				tax_amount = flt(invoice_tax_map.get(inv.name, {}).get(tax_acc))
				total_tax += tax_amount
				row.append(tax_amount)

		# total tax, grand total, outstanding amount & rounded total
		row += [total_tax, inv.base_grand_total, inv.base_rounded_total, inv.outstanding_amount]

		data.append(row)

	return columns, data


def get_columns(invoice_list):
	"""return columns based on filters"""
	columns = [
		_("Invoice") + ":Link/Sales Invoice:120", _("Posting Date") + ":Date:80", _("Customer Id") + "::120",
		_("Customer Name") + "::120", _("Customer Group") + ":Link/Customer Group:120", _("Territory") + ":Link/Territory:80",
		_("Receivable Account") + ":Link/Account:120", _("Project") +":Link/Project:80", _("Remarks") + "::150",
		_("Sales Order") + ":Link/Sales Order:100", _("Delivery Note") + ":Link/Delivery Note:100"
	]

	income_accounts = tax_accounts = income_columns = tax_columns = []

	if invoice_list:
		income_accounts = frappe.db.sql_list("""select distinct income_account
			from `tabSales Invoice Item` where docstatus = 1 and parent in (%s)
			order by income_account""" %
			', '.join(['%s']*len(invoice_list)), tuple([inv.name for inv in invoice_list]))

		tax_accounts = 	frappe.db.sql_list("""select distinct account_head
			from `tabSales Taxes and Charges` where parenttype = 'Sales Invoice'
			and docstatus = 1 and ifnull(base_tax_amount_after_discount_amount, 0) != 0
			and parent in (%s) order by account_head""" %
			', '.join(['%s']*len(invoice_list)), tuple([inv.name for inv in invoice_list]))

	income_columns = [(account + ":Currency:120") for account in income_accounts]
	for account in tax_accounts:
		if account not in income_accounts:
			tax_columns.append(account + ":Currency:120")

	columns = columns + income_columns + [_("Net Total") + ":Currency:120"] + tax_columns + \
		[_("Total Tax") + ":Currency:120", _("Grand Total") + ":Currency:120",
		_("Rounded Total") + ":Currency:120", _("Outstanding Amount") + ":Currency:120"]

	return columns, income_accounts, tax_accounts

def get_conditions(filters):
	conditions = ""

	if filters.get("company"): conditions += " and company=%(company)s"
	if filters.get("customer"): conditions += " and customer = %(customer)s"

	if filters.get("from_date"): conditions += " and posting_date >= %(from_date)s"
	if filters.get("to_date"): conditions += " and posting_date <= %(to_date)s"

	return conditions

def get_invoices(filters):
	conditions = get_conditions(filters)
	return frappe.db.sql("""select name, posting_date, debit_to, project_name, customer,
		customer_name, remarks, base_net_total, base_grand_total, base_rounded_total, outstanding_amount
		from `tabSales Invoice`
		where docstatus = 1 %s order by posting_date desc, name desc""" %
		conditions, filters, as_dict=1)

def get_invoice_income_map(invoice_list):
	income_details = frappe.db.sql("""select parent, income_account, sum(base_net_amount) as amount
		from `tabSales Invoice Item` where parent in (%s) group by parent, income_account""" %
		', '.join(['%s']*len(invoice_list)), tuple([inv.name for inv in invoice_list]), as_dict=1)

	invoice_income_map = {}
	for d in income_details:
		invoice_income_map.setdefault(d.parent, frappe._dict()).setdefault(d.income_account, [])
		invoice_income_map[d.parent][d.income_account] = flt(d.amount)

	return invoice_income_map

def get_invoice_tax_map(invoice_list, invoice_income_map, income_accounts):
	tax_details = frappe.db.sql("""select parent, account_head,
		sum(base_tax_amount_after_discount_amount) as tax_amount
		from `tabSales Taxes and Charges` where parent in (%s) group by parent, account_head""" %
		', '.join(['%s']*len(invoice_list)), tuple([inv.name for inv in invoice_list]), as_dict=1)

	invoice_tax_map = {}
	for d in tax_details:
		if d.account_head in income_accounts:
			if invoice_income_map[d.parent].has_key(d.account_head):
				invoice_income_map[d.parent][d.account_head] += flt(d.tax_amount)
			else:
				invoice_income_map[d.parent][d.account_head] = flt(d.tax_amount)
		else:
			invoice_tax_map.setdefault(d.parent, frappe._dict()).setdefault(d.account_head, [])
			invoice_tax_map[d.parent][d.account_head] = flt(d.tax_amount)

	return invoice_income_map, invoice_tax_map

def get_invoice_so_dn_map(invoice_list):
	si_items = frappe.db.sql("""select parent, sales_order, delivery_note, so_detail
		from `tabSales Invoice Item` where parent in (%s)
		and (ifnull(sales_order, '') != '' or ifnull(delivery_note, '') != '')""" %
		', '.join(['%s']*len(invoice_list)), tuple([inv.name for inv in invoice_list]), as_dict=1)

	invoice_so_dn_map = {}
	for d in si_items:
		if d.sales_order:
			invoice_so_dn_map.setdefault(d.parent, frappe._dict()).setdefault(
				"sales_order", []).append(d.sales_order)

		delivery_note_list = None
		if d.delivery_note:
			delivery_note_list = [d.delivery_note]
		elif d.sales_order:
			delivery_note_list = frappe.db.sql_list("""select distinct parent from `tabDelivery Note Item`
				where docstatus=1 and so_detail=%s""", d.so_detail)

		if delivery_note_list:
			invoice_so_dn_map.setdefault(d.parent, frappe._dict()).setdefault("delivery_note", delivery_note_list)

	return invoice_so_dn_map

def get_customer_deatils(invoice_list):
	customer_map = {}
	customers = list(set([inv.customer for inv in invoice_list]))
	for cust in frappe.db.sql("""select name, territory, customer_group from `tabCustomer`
		where name in (%s)""" % ", ".join(["%s"]*len(customers)), tuple(customers), as_dict=1):
			customer_map.setdefault(cust.name, cust)

	return customer_map
