# 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 _, throw
from frappe.utils import flt, cint, add_days, cstr, add_months
import json
from erpnext.accounts.doctype.pricing_rule.pricing_rule import get_pricing_rule_for_item, set_transaction_type
from erpnext.setup.utils import get_exchange_rate
from frappe.model.meta import get_field_precision
from erpnext.stock.doctype.batch.batch import get_batch_no
from erpnext import get_company_currency
from erpnext.stock.doctype.item.item import get_item_defaults, get_uom_conv_factor
from erpnext.setup.doctype.item_group.item_group import get_item_group_defaults
from erpnext.setup.doctype.brand.brand import get_brand_defaults

from six import string_types, iteritems

@frappe.whitelist()
def get_item_details(args):
	"""
		args = {
			"item_code": "",
			"warehouse": None,
			"customer": "",
			"conversion_rate": 1.0,
			"selling_price_list": None,
			"price_list_currency": None,
			"plc_conversion_rate": 1.0,
			"doctype": "",
			"name": "",
			"supplier": None,
			"transaction_date": None,
			"conversion_rate": 1.0,
			"buying_price_list": None,
			"is_subcontracted": "Yes" / "No",
			"ignore_pricing_rule": 0/1
			"project": ""
			"set_warehouse": ""
		}
	"""
	args = process_args(args)
	item = frappe.get_cached_doc("Item", args.item_code)
	validate_item_details(args, item)

	out = get_basic_details(args, item)

	get_party_item_code(args, item, out)

	set_valuation_rate(out, args)

	update_party_blanket_order(args, out)

	get_price_list_rate(args, item, out)

	if args.customer and cint(args.is_pos):
		out.update(get_pos_profile_item_details(args.company, args))

	if out.get("warehouse"):
		out.update(get_bin_details(args.item_code, out.warehouse))

	# update args with out, if key or value not exists
	for key, value in iteritems(out):
		if args.get(key) is None:
			args[key] = value

	out.update(get_pricing_rule_for_item(args))

	update_stock(args, out)

	if args.transaction_date and item.lead_time_days:
		out.schedule_date = out.lead_time_date = add_days(args.transaction_date,
			item.lead_time_days)

	if args.get("is_subcontracted") == "Yes":
		out.bom = args.get('bom') or get_default_bom(args.item_code)

	get_gross_profit(out)
	if args.doctype == 'Material Request':
		out.rate = args.rate or out.price_list_rate
		out.amount = flt(args.qty * out.rate)

	return out

def update_stock(args, out):
	if (args.get("doctype") == "Delivery Note" or
		(args.get("doctype") == "Sales Invoice" and args.get('update_stock'))) \
		and out.warehouse and out.stock_qty > 0:

		if out.has_batch_no and not args.get("batch_no"):
			out.batch_no = get_batch_no(out.item_code, out.warehouse, out.qty)
			actual_batch_qty = get_batch_qty(out.batch_no, out.warehouse, out.item_code)
			if actual_batch_qty:
				out.update(actual_batch_qty)

		if out.has_serial_no and args.get('batch_no'):
			reserved_so = get_so_reservation_for_item(args)
			out.batch_no = args.get('batch_no')
			out.serial_no = get_serial_no(out, args.serial_no, sales_order=reserved_so)

		elif out.has_serial_no:
			reserved_so = get_so_reservation_for_item(args)
			out.serial_no = get_serial_no(out, args.serial_no, sales_order=reserved_so)


def set_valuation_rate(out, args):
	if frappe.db.exists("Product Bundle", args.item_code, cache=True):
		valuation_rate = 0.0
		bundled_items = frappe.get_doc("Product Bundle", args.item_code)

		for bundle_item in bundled_items.items:
			valuation_rate += \
				flt(get_valuation_rate(bundle_item.item_code, args.company, out.get("warehouse")).get("valuation_rate") \
					* bundle_item.qty)

		out.update({
			"valuation_rate": valuation_rate
		})

	else:
		out.update(get_valuation_rate(args.item_code, args.company, out.get("warehouse")))


def process_args(args):
	if isinstance(args, string_types):
		args = json.loads(args)

	args = frappe._dict(args)

	if not args.get("price_list"):
		args.price_list = args.get("selling_price_list") or args.get("buying_price_list")

	if args.barcode:
		args.item_code = get_item_code(barcode=args.barcode)
	elif not args.item_code and args.serial_no:
		args.item_code = get_item_code(serial_no=args.serial_no)

	set_transaction_type(args)
	return args


@frappe.whitelist()
def get_item_code(barcode=None, serial_no=None):
	if barcode:
		item_code = frappe.db.get_value("Item Barcode", {"barcode": barcode}, fieldname=["parent"])
		if not item_code:
			frappe.throw(_("No Item with Barcode {0}").format(barcode))
	elif serial_no:
		item_code = frappe.db.get_value("Serial No", serial_no, "item_code")
		if not item_code:
			frappe.throw(_("No Item with Serial No {0}").format(serial_no))

	return item_code


def validate_item_details(args, item):
	if not args.company:
		throw(_("Please specify Company"))

	from erpnext.stock.doctype.item.item import validate_end_of_life
	validate_end_of_life(item.name, item.end_of_life, item.disabled)

	if args.transaction_type == "selling" and cint(item.has_variants):
		throw(_("Item {0} is a template, please select one of its variants").format(item.name))

	elif args.transaction_type == "buying" and args.doctype != "Material Request":
		if args.get("is_subcontracted") == "Yes" and item.is_sub_contracted_item != 1:
			throw(_("Item {0} must be a Sub-contracted Item").format(item.name))


def get_basic_details(args, item):
	"""
	:param args: {
			"item_code": "",
			"warehouse": None,
			"customer": "",
			"conversion_rate": 1.0,
			"selling_price_list": None,
			"price_list_currency": None,
			"price_list_uom_dependant": None,
			"plc_conversion_rate": 1.0,
			"doctype": "",
			"name": "",
			"supplier": None,
			"transaction_date": None,
			"conversion_rate": 1.0,
			"buying_price_list": None,
			"is_subcontracted": "Yes" / "No",
			"ignore_pricing_rule": 0/1
			"project": "",
			barcode: "",
			serial_no: "",
			currency: "",
			update_stock: "",
			price_list: "",
			company: "",
			order_type: "",
			is_pos: "",
			project: "",
			qty: "",
			stock_qty: "",
			conversion_factor: ""
		}
	:param item: `item_code` of Item object
	:return: frappe._dict
	"""

	if not item:
		item = frappe.get_doc("Item", args.get("item_code"))

	if item.variant_of:
		item.update_template_tables()

	from frappe.defaults import get_user_default_as_list
	user_default_warehouse_list = get_user_default_as_list('Warehouse')
	user_default_warehouse = user_default_warehouse_list[0] \
		if len(user_default_warehouse_list) == 1 else ""

	item_defaults = get_item_defaults(item.name, args.company)
	item_group_defaults = get_item_group_defaults(item.name, args.company)
	brand_defaults = get_brand_defaults(item.name, args.company)

	warehouse = args.get("set_warehouse") or user_default_warehouse or item_defaults.get("default_warehouse") or\
		item_group_defaults.get("default_warehouse") or brand_defaults.get("default_warehouse") or args.warehouse

	if args.get('doctype') == "Material Request" and not args.get('material_request_type'):
		args['material_request_type'] = frappe.db.get_value('Material Request',
			args.get('name'), 'material_request_type', cache=True)

	#Set the UOM to the Default Sales UOM or Default Purchase UOM if configured in the Item Master
	if not args.uom:
		if args.get('doctype') in ['Quotation', 'Sales Order', 'Delivery Note', 'Sales Invoice']:
			args.uom = item.sales_uom if item.sales_uom else item.stock_uom
		elif (args.get('doctype') in ['Purchase Order', 'Purchase Receipt', 'Purchase Invoice']) or \
			(args.get('doctype') == 'Material Request' and args.get('material_request_type') == 'Purchase'):
			args.uom = item.purchase_uom if item.purchase_uom else item.stock_uom
		else:
			args.uom = item.stock_uom

	out = frappe._dict({
		"item_code": item.name,
		"item_name": item.item_name,
		"description": cstr(item.description).strip(),
		"image": cstr(item.image).strip(),
		"warehouse": warehouse,
		"income_account": get_default_income_account(args, item_defaults, item_group_defaults, brand_defaults),
		"expense_account": get_default_expense_account(args, item_defaults, item_group_defaults, brand_defaults),
		"cost_center": get_default_cost_center(args, item_defaults, item_group_defaults, brand_defaults),
		'has_serial_no': item.has_serial_no,
		'has_batch_no': item.has_batch_no,
		"batch_no": None,
		"item_tax_rate": json.dumps(dict(([d.tax_type, d.tax_rate] for d in
			item.get("taxes")))),
		"uom": args.uom,
		"min_order_qty": flt(item.min_order_qty) if args.doctype == "Material Request" else "",
		"qty": args.qty or 1.0,
		"stock_qty": args.qty or 1.0,
		"price_list_rate": 0.0,
		"base_price_list_rate": 0.0,
		"rate": 0.0,
		"base_rate": 0.0,
		"amount": 0.0,
		"base_amount": 0.0,
		"net_rate": 0.0,
		"net_amount": 0.0,
		"discount_percentage": 0.0,
		"supplier": get_default_supplier(args, item_defaults, item_group_defaults, brand_defaults),
		"update_stock": args.get("update_stock") if args.get('doctype') in ['Sales Invoice', 'Purchase Invoice'] else 0,
		"delivered_by_supplier": item.delivered_by_supplier if args.get("doctype") in ["Sales Order", "Sales Invoice"] else 0,
		"is_fixed_asset": item.is_fixed_asset,
		"weight_per_unit":item.weight_per_unit,
		"weight_uom":item.weight_uom,
		"last_purchase_rate": item.last_purchase_rate if args.get("doctype") in ["Purchase Order"] else 0,
		"transaction_date": args.get("transaction_date")
	})

	if item.get("enable_deferred_revenue") or item.get("enable_deferred_expense"):
		out.update(calculate_service_end_date(args, item))

	# calculate conversion factor
	if item.stock_uom == args.uom:
		out.conversion_factor = 1.0
	else:
		out.conversion_factor = args.conversion_factor or \
			get_conversion_factor(item.item_code, args.uom).get("conversion_factor")

	args.conversion_factor = out.conversion_factor
	out.stock_qty = out.qty * out.conversion_factor

	# calculate last purchase rate
	from erpnext.buying.doctype.purchase_order.purchase_order import item_last_purchase_rate
	out.last_purchase_rate = item_last_purchase_rate(args.name, args.conversion_rate, item.item_code, out.conversion_factor)

	# if default specified in item is for another company, fetch from company
	for d in [
		["Account", "income_account", "default_income_account"],
		["Account", "expense_account", "default_expense_account"],
		["Cost Center", "cost_center", "cost_center"],
		["Warehouse", "warehouse", ""]]:
			if not out[d[1]]:
				out[d[1]] = frappe.get_cached_value('Company',  args.company,  d[2]) if d[2] else None

	for fieldname in ("item_name", "item_group", "barcodes", "brand", "stock_uom"):
		out[fieldname] = item.get(fieldname)

	return out

@frappe.whitelist()
def calculate_service_end_date(args, item=None):
	args = process_args(args)
	if not item:
		item = frappe.get_cached_doc("Item", args.item_code)

	doctype = args.get("parenttype") or args.get("doctype")
	if doctype == "Sales Invoice":
		enable_deferred = "enable_deferred_revenue"
		no_of_months = "no_of_months"
		account = "deferred_revenue_account"
	else:
		enable_deferred = "enable_deferred_expense"
		no_of_months = "no_of_months_exp"
		account = "deferred_expense_account"

	service_start_date = args.service_start_date if args.service_start_date else args.transaction_date
	service_end_date = add_months(service_start_date, item.get(no_of_months))
	deferred_detail = {
		"service_start_date": service_start_date,
		"service_end_date": service_end_date
	}
	deferred_detail[enable_deferred] = item.get(enable_deferred)
	deferred_detail[account] = get_default_deferred_account(args, item, fieldname=account)

	return deferred_detail

def get_default_income_account(args, item, item_group, brand):
	return (item.get("income_account")
		or item_group.get("income_account")
		or brand.get("income_account")
		or args.income_account)

def get_default_expense_account(args, item, item_group, brand):
	return (item.get("expense_account")
		or item_group.get("expense_account")
		or brand.get("expense_account")
		or args.expense_account)

def get_default_deferred_account(args, item, fieldname=None):
	if item.get("enable_deferred_revenue") or item.get("enable_deferred_expense"):
		return (item.get(fieldname)
			or args.get(fieldname)
			or frappe.get_cached_value('Company',  args.company,  "default_"+fieldname))
	else:
		return None

def get_default_cost_center(args, item, item_group, brand):
	cost_center = None
	if args.get('project'):
		cost_center = frappe.db.get_value("Project", args.get("project"), "cost_center", cache=True)

	if not cost_center:
		if args.get('customer'):
			cost_center = item.get('selling_cost_center') or item_group.get('selling_cost_center') or brand.get('selling_cost_center')
		else:
			cost_center = item.get('buying_cost_center') or item_group.get('buying_cost_center') or brand.get('buying_cost_center')

	return cost_center or args.get("cost_center")

def get_default_supplier(args, item, item_group, brand):
	return (item.get("default_supplier")
		or item_group.get("default_supplier")
		or brand.get("default_supplier"))

def get_price_list_rate(args, item_doc, out):
	meta = frappe.get_meta(args.parenttype or args.doctype)

	if meta.get_field("currency") or args.get('currency'):
		pl_details = get_price_list_currency_and_exchange_rate(args)
		args.update(pl_details)
		validate_price_list(args)
		if meta.get_field("currency") and args.price_list:
			validate_conversion_rate(args, meta)

		price_list_rate = get_price_list_rate_for(args, item_doc.name) or 0

		# variant
		if not price_list_rate and item_doc.variant_of:
			price_list_rate = get_price_list_rate_for(args, item_doc.variant_of)

		# insert in database
		if not price_list_rate:
			if args.price_list and args.rate:
				insert_item_price(args)
			return {}

		out.price_list_rate = flt(price_list_rate) * flt(args.plc_conversion_rate) \
			/ flt(args.conversion_rate)

		if not out.price_list_rate and args.transaction_type=="buying":
			from erpnext.stock.doctype.item.item import get_last_purchase_details
			out.update(get_last_purchase_details(item_doc.name,
				args.name, args.conversion_rate))

def insert_item_price(args):
	"""Insert Item Price if Price List and Price List Rate are specified and currency is the same"""
	if frappe.db.get_value("Price List", args.price_list, "currency", cache=True) == args.currency \
		and cint(frappe.db.get_single_value("Stock Settings", "auto_insert_price_list_rate_if_missing")):
		if frappe.has_permission("Item Price", "write"):
			price_list_rate = (args.rate / args.get('conversion_factor')
				if args.get("conversion_factor") else args.rate)

			item_price = frappe.db.get_value('Item Price',
				{'item_code': args.item_code, 'price_list': args.price_list, 'currency': args.currency},
				['name', 'price_list_rate'], as_dict=1)
			if item_price and item_price.name:
				if item_price.price_list_rate != price_list_rate:
					frappe.db.set_value('Item Price', item_price.name, "price_list_rate", price_list_rate)
					frappe.msgprint(_("Item Price updated for {0} in Price List {1}").format(args.item_code,
						args.price_list), alert=True)
			else:
				item_price = frappe.get_doc({
					"doctype": "Item Price",
					"price_list": args.price_list,
					"item_code": args.item_code,
					"currency": args.currency,
					"price_list_rate": price_list_rate
				})
				item_price.insert()
				frappe.msgprint(_("Item Price added for {0} in Price List {1}").format(args.item_code,
					args.price_list), alert=True)

def get_item_price(args, item_code, ignore_party=False):
	"""
		Get name, price_list_rate from Item Price based on conditions
			Check if the Derised qty is within the increment of the packing list.
		:param args: dict (or frappe._dict) with mandatory fields price_list, uom
			optional fields min_qty, transaction_date, customer, supplier
		:param item_code: str, Item Doctype field item_code
	"""

	args['item_code'] = item_code

	conditions = """where item_code=%(item_code)s
		and price_list=%(price_list)s
		and ifnull(uom, '') in ('', %(uom)s)"""

	if not ignore_party:
		if args.get("customer"):
			conditions += " and customer=%(customer)s"
		elif args.get("supplier"):
			conditions += " and supplier=%(supplier)s"
		else:
			conditions += " and (customer is null or customer = '') and (supplier is null or supplier = '')"

	if args.get('min_qty'):
		conditions += " and ifnull(min_qty, 0) <= %(min_qty)s"

	if args.get('transaction_date'):
		conditions += """ and %(transaction_date)s between
			ifnull(valid_from, '2000-01-01') and ifnull(valid_upto, '2500-12-31')"""

	return frappe.db.sql(""" select name, price_list_rate, uom
		from `tabItem Price` {conditions}
		order by uom desc, min_qty desc """.format(conditions=conditions), args)

def get_price_list_rate_for(args, item_code):
	"""
		Return Price Rate based on min_qty of each Item Price Rate.\
		For example, desired qty is 10 and Item Price Rates exists
		for min_qty 9 and min_qty 20. It returns Item Price Rate for qty 9 as
		the best fit in the range of avaliable min_qtyies

        :param customer: link to Customer DocType
        :param supplier: link to Supplier DocType
		:param price_list: str (Standard Buying or Standard Selling)
		:param item_code: str, Item Doctype field item_code
		:param qty: Derised Qty
		:param transaction_date: Date of the price
	"""
	item_price_args = {
			"item_code": item_code,
			"price_list": args.get('price_list'),
			"customer": args.get('customer'),
			"supplier": args.get('supplier'),
			"uom": args.get('uom'),
			"min_qty": args.get('qty'),
			"transaction_date": args.get('transaction_date'),
	}

	item_price_data = 0
	price_list_rate = get_item_price(item_price_args, item_code)
	if price_list_rate:
		desired_qty = args.get("qty")
		if check_packing_list(price_list_rate[0][0], desired_qty, item_code):
			item_price_data = price_list_rate
	else:
		for field in ["customer", "supplier", "min_qty"]:
			del item_price_args[field]

		general_price_list_rate = get_item_price(item_price_args, item_code, ignore_party=args.get("ignore_party"))
		if not general_price_list_rate and args.get("uom") != args.get("stock_uom"):
			item_price_args["args"] = args.get("stock_uom")
			general_price_list_rate = get_item_price(item_price_args, item_code, ignore_party=args.get("ignore_party"))

		if general_price_list_rate:
			item_price_data = general_price_list_rate

	if item_price_data:
		if item_price_data[0][2] == args.get("uom"):
			return item_price_data[0][1]
		elif not args.get('price_list_uom_dependant'):
			return flt(item_price_data[0][1] * flt(args.get("conversion_factor", 1)))
		else:
			return item_price_data[0][1]

def check_packing_list(price_list_rate_name, desired_qty, item_code):
	"""
		Check if the Derised qty is within the increment of the packing list.
		:param price_list_rate_name: Name of Item Price
        :param desired_qty: Derised Qt
		:param item_code: str, Item Doctype field item_code
		:param qty: Derised Qt
	"""

	item_price = frappe.get_doc("Item Price", price_list_rate_name)
	if desired_qty and item_price.packing_unit:
		packing_increment = desired_qty % item_price.packing_unit

		if packing_increment == 0:
			return True

def validate_price_list(args):
	if args.get("price_list"):
		if not frappe.db.get_value("Price List",
			{"name": args.price_list, args.transaction_type: 1, "enabled": 1}):
			throw(_("Price List {0} is disabled or does not exist").format(args.price_list))
	elif not args.get("supplier"):
		throw(_("Price List not selected"))

def validate_conversion_rate(args, meta):
	from erpnext.controllers.accounts_controller import validate_conversion_rate

	if (not args.conversion_rate
		and args.currency==frappe.get_cached_value('Company',  args.company,  "default_currency")):
		args.conversion_rate = 1.0

	# validate currency conversion rate
	validate_conversion_rate(args.currency, args.conversion_rate,
		meta.get_label("conversion_rate"), args.company)

	args.conversion_rate = flt(args.conversion_rate,
		get_field_precision(meta.get_field("conversion_rate"),
			frappe._dict({"fields": args})))

	if (not args.plc_conversion_rate
		and args.price_list_currency==frappe.db.get_value("Price List", args.price_list, "currency", cache=True)):
		args.plc_conversion_rate = 1.0

	# validate price list currency conversion rate
	if not args.get("price_list_currency"):
		throw(_("Price List Currency not selected"))
	else:
		validate_conversion_rate(args.price_list_currency, args.plc_conversion_rate,
			meta.get_label("plc_conversion_rate"), args.company)

		if meta.get_field("plc_conversion_rate"):
			args.plc_conversion_rate = flt(args.plc_conversion_rate,
				get_field_precision(meta.get_field("plc_conversion_rate"),
				frappe._dict({"fields": args})))

def get_party_item_code(args, item_doc, out):
	if args.transaction_type=="selling" and args.customer:
		out.customer_item_code = None
		customer_item_code = item_doc.get("customer_items", {"customer_name": args.customer})

		if customer_item_code:
			out.customer_item_code = customer_item_code[0].ref_code
		else:
			customer_group = frappe.get_cached_value("Customer", args.customer, "customer_group")
			customer_group_item_code = item_doc.get("customer_items", {"customer_group": customer_group})
			if customer_group_item_code and not customer_group_item_code[0].customer_name:
				out.customer_item_code = customer_group_item_code[0].ref_code

	if args.transaction_type=="buying" and args.supplier:
		item_supplier = item_doc.get("supplier_items", {"supplier": args.supplier})
		out.supplier_part_no = item_supplier[0].supplier_part_no if item_supplier else None

def get_pos_profile_item_details(company, args, pos_profile=None, update_data=False):
	res = frappe._dict()

	if not frappe.flags.pos_profile and not pos_profile:
		pos_profile = frappe.flags.pos_profile = get_pos_profile(company, args.get('pos_profile'))

	if pos_profile:
		for fieldname in ("income_account", "cost_center", "warehouse", "expense_account"):
			if (not args.get(fieldname) or update_data) and pos_profile.get(fieldname):
				res[fieldname] = pos_profile.get(fieldname)

		if res.get("warehouse"):
			res.actual_qty = get_bin_details(args.item_code,
				res.warehouse).get("actual_qty")

	return res

@frappe.whitelist()
def get_pos_profile(company, pos_profile=None, user=None):
	if pos_profile:
		return frappe.get_cached_doc('POS Profile', pos_profile)

	if not user:
		user = frappe.session['user']

	pos_profile = frappe.db.sql("""SELECT pf.*
		FROM
			`tabPOS Profile` pf LEFT JOIN `tabPOS Profile User` pfu
		ON
				pf.name = pfu.parent
		WHERE
			(
				(pfu.user = %(user)s AND pf.company = %(company)s AND pfu.default=1)
				OR (pfu.user = %(user)s AND pfu.default=1)
				OR (ifnull(pfu.user, '') = '' AND pf.company = %(company)s)
			) AND pf.disabled = 0
	""", {
		'user': user,
		'company': company
	}, as_dict=1)

	return pos_profile and pos_profile[0] or None

def get_serial_nos_by_fifo(args, sales_order=None):
	if frappe.db.get_single_value("Stock Settings", "automatically_set_serial_nos_based_on_fifo"):
		return "\n".join(frappe.db.sql_list("""select name from `tabSerial No`
			where item_code=%(item_code)s and warehouse=%(warehouse)s and
			sales_order=IF(%(sales_order)s IS NULL, sales_order, %(sales_order)s)
			order by timestamp(purchase_date, purchase_time)
			asc limit %(qty)s""",
			{
				"item_code": args.item_code,
				"warehouse": args.warehouse,
				"qty": abs(cint(args.stock_qty)),
				"sales_order": sales_order
			}))

def get_serial_no_batchwise(args, sales_order=None):
	if frappe.db.get_single_value("Stock Settings", "automatically_set_serial_nos_based_on_fifo"):
		return "\n".join(frappe.db.sql_list("""select name from `tabSerial No`
			where item_code=%(item_code)s and warehouse=%(warehouse)s and
			sales_order=IF(%(sales_order)s IS NULL, sales_order, %(sales_order)s)
			and batch_no=IF(%(batch_no)s IS NULL, batch_no, %(batch_no)s) order
			by timestamp(purchase_date, purchase_time) asc limit %(qty)s""", {
				"item_code": args.item_code,
				"warehouse": args.warehouse,
				"batch_no": args.batch_no,
				"qty": abs(cint(args.stock_qty)),
				"sales_order": sales_order
			}))

@frappe.whitelist()
def get_conversion_factor(item_code, uom):
	variant_of = frappe.db.get_value("Item", item_code, "variant_of", cache=True)
	filters = {"parent": item_code, "uom": uom}
	if variant_of:
		filters["parent"] = ("in", (item_code, variant_of))
	conversion_factor = frappe.db.get_value("UOM Conversion Detail",
		filters, "conversion_factor")
	if not conversion_factor:
		stock_uom = frappe.db.get_value("Item", item_code, "stock_uom")
		conversion_factor = get_uom_conv_factor(uom, stock_uom)
	return {"conversion_factor": conversion_factor or 1.0}

@frappe.whitelist()
def get_projected_qty(item_code, warehouse):
	return {"projected_qty": frappe.db.get_value("Bin",
		{"item_code": item_code, "warehouse": warehouse}, "projected_qty")}

@frappe.whitelist()
def get_bin_details(item_code, warehouse):
	return frappe.db.get_value("Bin", {"item_code": item_code, "warehouse": warehouse},
		["projected_qty", "actual_qty", "reserved_qty"], as_dict=True, cache=True) \
			or {"projected_qty": 0, "actual_qty": 0, "reserved_qty": 0}

@frappe.whitelist()
def get_serial_no_details(item_code, warehouse, stock_qty, serial_no):
	args = frappe._dict({"item_code":item_code, "warehouse":warehouse, "stock_qty":stock_qty, "serial_no":serial_no})
	serial_no = get_serial_no(args)
	return {'serial_no': serial_no}

@frappe.whitelist()
def get_bin_details_and_serial_nos(item_code, warehouse, has_batch_no, stock_qty=None, serial_no=None):
	bin_details_and_serial_nos = {}
	bin_details_and_serial_nos.update(get_bin_details(item_code, warehouse))
	if flt(stock_qty) > 0:
		if has_batch_no:
			args = frappe._dict({"item_code":item_code, "warehouse":warehouse, "stock_qty":stock_qty})
			serial_no = get_serial_no(args)
			bin_details_and_serial_nos.update({'serial_no': serial_no})
			return bin_details_and_serial_nos

		bin_details_and_serial_nos.update(get_serial_no_details(item_code, warehouse, stock_qty, serial_no))
	return bin_details_and_serial_nos

@frappe.whitelist()
def get_batch_qty_and_serial_no(batch_no, stock_qty, warehouse, item_code, has_serial_no):
	batch_qty_and_serial_no = {}
	batch_qty_and_serial_no.update(get_batch_qty(batch_no, warehouse, item_code))

	if (flt(batch_qty_and_serial_no.get('actual_batch_qty')) >= flt(stock_qty)) and has_serial_no:
		args = frappe._dict({"item_code":item_code, "warehouse":warehouse, "stock_qty":stock_qty, "batch_no":batch_no})
		serial_no = get_serial_no(args)
		batch_qty_and_serial_no.update({'serial_no': serial_no})
	return batch_qty_and_serial_no

@frappe.whitelist()
def get_batch_qty(batch_no, warehouse, item_code):
	from erpnext.stock.doctype.batch import batch
	if batch_no:
		return {'actual_batch_qty': batch.get_batch_qty(batch_no, warehouse)}

@frappe.whitelist()
def apply_price_list(args, as_doc=False):
	"""Apply pricelist on a document-like dict object and return as
	{'parent': dict, 'children': list}

	:param args: See below
	:param as_doc: Updates value in the passed dict

		args = {
			"doctype": "",
			"name": "",
			"items": [{"doctype": "", "name": "", "item_code": "", "brand": "", "item_group": ""}, ...],
			"conversion_rate": 1.0,
			"selling_price_list": None,
			"price_list_currency": None,
			"price_list_uom_dependant": None,
			"plc_conversion_rate": 1.0,
			"doctype": "",
			"name": "",
			"supplier": None,
			"transaction_date": None,
			"conversion_rate": 1.0,
			"buying_price_list": None,
			"ignore_pricing_rule": 0/1
		}
	"""
	args = process_args(args)

	parent = get_price_list_currency_and_exchange_rate(args)
	children = []

	if "items" in args:
		item_list = args.get("items")
		args.update(parent)

		for item in item_list:
			args_copy = frappe._dict(args.copy())
			args_copy.update(item)
			item_details = apply_price_list_on_item(args_copy)
			children.append(item_details)

	if as_doc:
		args.price_list_currency = parent.price_list_currency,
		args.plc_conversion_rate = parent.plc_conversion_rate
		if args.get('items'):
			for i, item in enumerate(args.get('items')):
				for fieldname in children[i]:
					# if the field exists in the original doc
					# update the value
					if fieldname in item and fieldname not in ("name", "doctype"):
						item[fieldname] = children[i][fieldname]
		return args
	else:
		return {
			"parent": parent,
			"children": children
		}

def apply_price_list_on_item(args):
	item_details = frappe._dict()
	item_doc = frappe.get_doc("Item", args.item_code)
	get_price_list_rate(args, item_doc, item_details)

	item_details.update(get_pricing_rule_for_item(args))

	return item_details

def get_price_list_currency(price_list):
	if price_list:
		result = frappe.db.get_value("Price List", {"name": price_list,
			"enabled": 1}, ["name", "currency"], as_dict=True)

		if not result:
			throw(_("Price List {0} is disabled or does not exist").format(price_list))

		return result.currency

def get_price_list_uom_dependant(price_list):
	if price_list:
		result = frappe.db.get_value("Price List", {"name": price_list,
			"enabled": 1}, ["name", "price_not_uom_dependant"], as_dict=True)

		if not result:
			throw(_("Price List {0} is disabled or does not exist").format(price_list))

		return not result.price_not_uom_dependant


def get_price_list_currency_and_exchange_rate(args):
	if not args.price_list:
		return {}

	if args.doctype in ['Quotation', 'Sales Order', 'Delivery Note', 'Sales Invoice']:
		args.update({"exchange_rate": "for_selling"})
	elif args.doctype in ['Purchase Order', 'Purchase Receipt', 'Purchase Invoice']:
		args.update({"exchange_rate": "for_buying"})

	price_list_currency = get_price_list_currency(args.price_list)
	price_list_uom_dependant = get_price_list_uom_dependant(args.price_list)
	plc_conversion_rate = args.plc_conversion_rate
	company_currency = get_company_currency(args.company)

	if (not plc_conversion_rate) or (price_list_currency and args.price_list_currency \
		and price_list_currency != args.price_list_currency):
			# cksgb 19/09/2016: added args.transaction_date as posting_date argument for get_exchange_rate
			plc_conversion_rate = get_exchange_rate(price_list_currency, company_currency,
				args.transaction_date, args.exchange_rate) or plc_conversion_rate

	return frappe._dict({
		"price_list_currency": price_list_currency,
		"price_list_uom_dependant": price_list_uom_dependant,
		"plc_conversion_rate": plc_conversion_rate
	})

@frappe.whitelist()
def get_default_bom(item_code=None):
	if item_code:
		bom = frappe.db.get_value("BOM", {"docstatus": 1, "is_default": 1, "is_active": 1, "item": item_code})
		if bom:
			return bom

def get_valuation_rate(item_code, company, warehouse=None):
	item = get_item_defaults(item_code, company)
	item_group = get_item_group_defaults(item_code, company)
	brand = get_brand_defaults(item_code, company)
	# item = frappe.get_doc("Item", item_code)
	if item.get("is_stock_item"):
		if not warehouse:
			warehouse = item.get("default_warehouse") or item_group.get("default_warehouse") or brand.get("default_warehouse")

		return frappe.db.get_value("Bin", {"item_code": item_code, "warehouse": warehouse},
			["valuation_rate"], as_dict=True) or {"valuation_rate": 0}

	elif not item.get("is_stock_item"):
		valuation_rate =frappe.db.sql("""select sum(base_net_amount) / sum(qty*conversion_factor)
			from `tabPurchase Invoice Item`
			where item_code = %s and docstatus=1""", item_code)

		if valuation_rate:
			return {"valuation_rate": valuation_rate[0][0] or 0.0}
	else:
		return {"valuation_rate": 0.0}

def get_gross_profit(out):
	if out.valuation_rate:
		out.update({
			"gross_profit": ((out.base_rate - out.valuation_rate) * out.stock_qty)
		})

	return out

@frappe.whitelist()
def get_serial_no(args, serial_nos=None, sales_order=None):
	serial_no = None
	if isinstance(args, string_types):
		args = json.loads(args)
		args = frappe._dict(args)
	if args.get('doctype') == 'Sales Invoice' and not args.get('update_stock'):
		return ""
	if args.get('warehouse') and args.get('stock_qty') and args.get('item_code'):
		has_serial_no = frappe.get_value('Item', {'item_code': args.item_code}, "has_serial_no")
		if args.get('batch_no') and has_serial_no == 1:
			return get_serial_no_batchwise(args, sales_order)
		elif has_serial_no == 1:
			args = json.dumps({"item_code": args.get('item_code'),"warehouse": args.get('warehouse'),"stock_qty": args.get('stock_qty')})
			args = process_args(args)
			serial_no = get_serial_nos_by_fifo(args, sales_order)

	if not serial_no and serial_nos:
		# For POS
		serial_no = serial_nos

	return serial_no


def update_party_blanket_order(args, out):
	blanket_order_details = get_blanket_order_details(args)
	if blanket_order_details:
		out.update(blanket_order_details)

@frappe.whitelist()
def get_blanket_order_details(args):
	if isinstance(args, string_types):
		args = frappe._dict(json.loads(args))

	blanket_order_details = None
	condition = ''
	if args.item_code:
		if args.customer and args.doctype == "Sales Order":
			condition = ' and bo.customer=%(customer)s'
		elif args.supplier and args.doctype == "Purchase Order":
			condition = ' and bo.supplier=%(supplier)s'
		if args.blanket_order:
			condition += ' and bo.name =%(blanket_order)s'
		if args.transaction_date:
			condition += ' and bo.to_date>=%(transaction_date)s'

		blanket_order_details = frappe.db.sql('''
				select boi.rate as blanket_order_rate, bo.name as blanket_order
				from `tabBlanket Order` bo, `tabBlanket Order Item` boi
				where bo.company=%(company)s and boi.item_code=%(item_code)s
					and bo.docstatus=1 and bo.name = boi.parent {0}
			'''.format(condition), args, as_dict=True)

		blanket_order_details = blanket_order_details[0] if blanket_order_details else ''
	return blanket_order_details

def get_so_reservation_for_item(args):
	reserved_so = None
	if args.get('against_sales_order'):
		if get_reserved_qty_for_so(args.get('against_sales_order'), args.get('item_code')):
			reserved_so = args.get('against_sales_order')
	elif args.get('against_sales_invoice'):
		sales_order = frappe.db.sql("""select sales_order from `tabSales Invoice Item` where
		parent=%s and item_code=%s""", (args.get('against_sales_invoice'), args.get('item_code')))
		if sales_order and sales_order[0]:
			if get_reserved_qty_for_so(sales_order[0][0], args.get('item_code')):
				reserved_so = sales_order[0]
	elif args.get("sales_order"):
		if get_reserved_qty_for_so(args.get('sales_order'), args.get('item_code')):
			reserved_so = args.get('sales_order')
	return reserved_so

def get_reserved_qty_for_so(sales_order, item_code):
	reserved_qty = frappe.db.sql("""select sum(qty) from `tabSales Order Item`
	where parent=%s and item_code=%s and ensure_delivery_based_on_produced_serial_no=1
	""", (sales_order, item_code))
	if reserved_qty and reserved_qty[0][0]:
		return reserved_qty[0][0]
	else:
		return 0