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

from __future__ import unicode_literals

import frappe
from erpnext import get_default_company
from erpnext.accounts.party import get_party_details
from erpnext.stock.get_item_details import get_price_list_rate_for
from frappe import _


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

	if not filters.get("customer"):
		frappe.throw(_("Please select a Customer"))

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

	return columns, data


def get_columns(filters=None):
	return [
		{
			"label": _("Item Code"),
			"fieldname": "item_code",
			"fieldtype": "Link",
			"options": "Item",
			"width": 150
		},
		{
			"label": _("Item Name"),
			"fieldname": "item_name",
			"fieldtype": "Data",
			"width": 200
		},
		{
			"label": _("Selling Rate"),
			"fieldname": "selling_rate",
			"fieldtype": "Currency"
		},
		{
			"label": _("Available Stock"),
			"fieldname": "available_stock",
			"fieldtype": "Float",
			"width": 150
		},
		{
			"label": _("Price List"),
			"fieldname": "price_list",
			"fieldtype": "Link",
			"options": "Price List",
			"width": 120
		}
	]


def get_data(filters=None):
	data = []
	customer_details = get_customer_details(filters)

	items = get_selling_items(filters)
	item_stock_map = frappe.get_all("Bin", fields=["item_code", "sum(actual_qty) AS available"], group_by="item_code")
	item_stock_map = {item.item_code: item.available for item in item_stock_map}

	for item in items:
		price_list_rate = get_price_list_rate_for(customer_details, item.item_code) or 0.0
		available_stock = item_stock_map.get(item.item_code)

		data.append({
			"item_code": item.item_code,
			"item_name": item.item_name,
			"selling_rate": price_list_rate,
			"price_list": customer_details.get("price_list"),
			"available_stock": available_stock,
		})

	return data


def get_customer_details(filters):
	customer_details = get_party_details(party=filters.get("customer"), party_type="Customer")
	customer_details.update({
		"company": get_default_company(),
		"price_list": customer_details.get("selling_price_list")
	})

	return customer_details


def get_selling_items(filters):
	if filters.get("item"):
		item_filters = {"item_code": filters.get("item"), "is_sales_item": 1, "disabled": 0}
	else:
		item_filters = {"is_sales_item": 1, "disabled": 0}

	items = frappe.get_all("Item", filters=item_filters, fields=["item_code", "item_name"], order_by="item_name")

	return items
