# Copyright (c) 2013, Frappe Technologies Pvt. Ltd. and contributors
# For license information, please see license.txt


import frappe
from frappe import _
from frappe.utils import cint


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

	days_since_last_order = filters.get("days_since_last_order")
	doctype = filters.get("doctype")

	if cint(days_since_last_order) <= 0:
		frappe.throw(_("'Days Since Last Order' must be greater than or equal to zero"))

	columns = get_columns()
	customers = get_sales_details(doctype)

	data = []
	for cust in customers:
		if cint(cust[8]) >= cint(days_since_last_order):
			cust.insert(7, get_last_sales_amt(cust[0], doctype))
			data.append(cust)
	return columns, data


def get_sales_details(doctype):
	cond = """sum(so.base_net_total) as 'total_order_considered',
			max(so.posting_date) as 'last_order_date',
			DATEDIFF(CURRENT_DATE, max(so.posting_date)) as 'days_since_last_order' """
	if doctype == "Sales Order":
		cond = """sum(if(so.status = "Stopped",
				so.base_net_total * so.per_delivered/100,
				so.base_net_total)) as 'total_order_considered',
			max(so.transaction_date) as 'last_order_date',
			DATEDIFF(CURRENT_DATE, max(so.transaction_date)) as 'days_since_last_order'"""

	return frappe.db.sql(
		"""select
			cust.name,
			cust.customer_name,
			cust.territory,
			cust.customer_group,
			count(distinct(so.name)) as 'num_of_order',
			sum(base_net_total) as 'total_order_value', {0}
		from `tabCustomer` cust, `tab{1}` so
		where cust.name = so.customer and so.docstatus = 1
		group by cust.name
		order by 'days_since_last_order' desc """.format(
			cond, doctype
		),
		as_list=1,
	)


def get_last_sales_amt(customer, doctype):
	cond = "posting_date"
	if doctype == "Sales Order":
		cond = "transaction_date"
	res = frappe.db.sql(
		"""select base_net_total from `tab{0}`
		where customer = %s and docstatus = 1 order by {1} desc
		limit 1""".format(
			doctype, cond
		),
		customer,
	)

	return res and res[0][0] or 0


def get_columns():
	return [
		_("Customer") + ":Link/Customer:120",
		_("Customer Name") + ":Data:120",
		_("Territory") + "::120",
		_("Customer Group") + "::120",
		_("Number of Order") + "::120",
		_("Total Order Value") + ":Currency:120",
		_("Total Order Considered") + ":Currency:160",
		_("Last Order Amount") + ":Currency:160",
		_("Last Order Date") + ":Date:160",
		_("Days Since Last Order") + "::160",
	]