# 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 import _
from frappe.utils import flt, getdate

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

	columns = get_columns(filters)
	item_map = get_item_details(filters)
	iwb_map = get_item_warehouse_map(filters)

	data = []
	for company in sorted(iwb_map):
		for item in sorted(iwb_map[company]):
			for wh in sorted(iwb_map[company][item]):
				qty_dict = iwb_map[company][item][wh]
				data.append([item, item_map[item]["item_name"],
					item_map[item]["item_group"],
					item_map[item]["brand"],
					item_map[item]["description"], wh,
					item_map[item]["stock_uom"], qty_dict.opening_qty,
					qty_dict.opening_val, qty_dict.in_qty,
					qty_dict.in_val, qty_dict.out_qty,
					qty_dict.out_val, qty_dict.bal_qty,
					qty_dict.bal_val, qty_dict.val_rate,
					company
				])

	return columns, data

def get_columns(filters):
	"""return columns based on filters"""

	columns = ["Item:Link/Item:100", "Item Name::150", "Item Group::100", "Brand::90", \
	"Description::140", "Warehouse:Link/Warehouse:100", "Stock UOM:Link/UOM:90", "Opening Qty:Float:100", \
	"Opening Value:Float:110", "In Qty:Float:80", "In Value:Float:80", "Out Qty:Float:80", \
	"Out Value:Float:80", "Balance Qty:Float:100", "Balance Value:Float:100", \
	"Valuation Rate:Float:90", "Company:Link/Company:100"]

	return columns

def get_conditions(filters):
	conditions = ""
	if not filters.get("from_date"):
		frappe.throw(_("'From Date' is required"))

	if filters.get("to_date"):
		conditions += " and posting_date <= '%s'" % filters["to_date"]
	else:
		frappe.throw(_("'To Date' is required"))

	if filters.get("item_code"):
		conditions += " and item_code = '%s'" % frappe.db.escape(filters.get("item_code"))

	return conditions

#get all details
def get_stock_ledger_entries(filters):
	conditions = get_conditions(filters)
	return frappe.db.sql("""select item_code, warehouse, posting_date, actual_qty, valuation_rate,
	company, voucher_type, qty_after_transaction, stock_value_difference
		from `tabStock Ledger Entry`
		where docstatus < 2 %s order by posting_date, posting_time, name""" %
		conditions, as_dict=1)

def get_item_warehouse_map(filters):
	sle = get_stock_ledger_entries(filters)
	iwb_map = {}

	for d in sle:
		iwb_map.setdefault(d.company, {}).setdefault(d.item_code, {}).\
		setdefault(d.warehouse, frappe._dict({\
				"opening_qty": 0.0, "opening_val": 0.0,
				"in_qty": 0.0, "in_val": 0.0,
				"out_qty": 0.0, "out_val": 0.0,
				"bal_qty": 0.0, "bal_val": 0.0,
				"val_rate": 0.0, "uom": None
			}))
		qty_dict = iwb_map[d.company][d.item_code][d.warehouse]

		if d.voucher_type == "Stock Reconciliation":
			qty_diff = flt(d.qty_after_transaction) - qty_dict.bal_qty
		else:
			qty_diff = flt(d.actual_qty)

		value_diff = flt(d.stock_value_difference)
		
		if d.posting_date < getdate(filters["from_date"]):
			qty_dict.opening_qty += qty_diff
			qty_dict.opening_val += value_diff
		elif d.posting_date >= getdate(filters["from_date"]) and d.posting_date <= getdate(filters["to_date"]):
			qty_dict.val_rate = d.valuation_rate
			if qty_diff > 0:
				qty_dict.in_qty += qty_diff
				qty_dict.in_val += value_diff
			else:
				qty_dict.out_qty += abs(qty_diff)
				qty_dict.out_val += abs(value_diff)

		qty_dict.bal_qty += qty_diff
		qty_dict.bal_val += value_diff

	return iwb_map

def get_item_details(filters):
	item_map = {}
	for d in frappe.db.sql("select name, item_name, stock_uom, item_group, brand, \
		description from tabItem", as_dict=1):
		item_map.setdefault(d.name, d)

	return item_map