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

from __future__ import unicode_literals
import frappe
from frappe.utils import getdate, add_days, today, cint
from frappe import _

def execute(filters=None):

	columns = get_columns()
	data = get_data(filters)
	return columns, data

def get_columns():

	columns = [
		{
			"fieldname": "territory",
			"fieldtype": "Link",
			"label": _("Territory"),
			"options": "Territory",
			"width": 100
		},
		{
			"fieldname": "item_group",
			"fieldtype": "Link",
			"label": _("Item Group"),
			"options": "Item Group",
			"width": 150
		},
		{
			"fieldname": "item_name",
			"fieldtype": "Link",
			"options": "Item",
			"label": "Item",
			"width": 150
		},
		{
			"fieldname": "item_name",
			"fieldtype": "Data",
			"label": _("Item Name"),
			"width": 150
		},

		{
			"fieldname": "customer",
			"fieldtype": "Link",
			"label": _("Customer"),
			"options": "Customer",
			"width": 100
		},
		{
			"fieldname": "last_order_date",
			"fieldtype": "Date",
			"label": _("Last Order Date"),
			"width": 100
		},
		{
			"fieldname": "qty",
			"fieldtype": "Float",
			"label": _("Quantity"),
			"width": 100
		},
		{
			"fieldname": "days_since_last_order",
			"fieldtype": "Int",
			"label": _("Days Since Last Order"),
			"width": 100
		},
	]

	return columns


def get_data(filters):

	data = []
	items = get_items(filters)
	sales_invoice_data = get_sales_details(filters)

	for item in items:
		if sales_invoice_data.get(item.name):
			item_obj = sales_invoice_data[item.name]
			if item_obj.days_since_last_order > cint(filters['days']):
				row = {
					"territory": item_obj.territory,
					"item_group": item_obj.item_group,
					"item": item_obj.name,
					"item_name": item_obj.item_name,
					"customer": item_obj.customer,
					"last_order_date": item_obj.last_order_date,
					"qty": item_obj.qty,
					"days_since_last_order": item_obj.days_since_last_order
				}
				data.append(row)
		else:
			row = {
				"item_group": item.item_group,
				"item": item.name,
				"item_name": item.item_name
			}
			data.append(row)

	return data


def get_sales_details(filters):

	data = []
	item_details_map = {}

	date_field = "s.transaction_date" if filters["based_on"] == "Sales Order" else "s.posting_date"

	sales_data = frappe.db.sql("""
		select s.territory, s.customer, si.item_group, si.item_name, si.qty, {date_field} as last_order_date,
		DATEDIFF(CURDATE(), {date_field}) as days_since_last_order
		from `tab{doctype}` s, `tab{doctype} Item` si
		where s.name = si.parent and s.docstatus = 1
		group by si.name order by days_since_last_order """ #nosec
		.format(date_field = date_field, doctype = filters['based_on']), as_dict=1)

	for d in sales_data:
		item_details_map.setdefault(d.item_name, d)

	return item_details_map

def get_items(filters):

	filters_dict = {
		"disabled": 0,
		"is_stock_item": 1
	}

	if filters.get("item_group"):
		filters_dict.update({
			"item_group": filters["item_group"]
		})

	if filters.get("item"):
		filters_dict.update({
			"name": filters["item"]
		})

	items = frappe.get_all("Item", fields=["name", "item_group", "item_name"], filters=filters_dict, order_by="name")

	return items