# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
# License: GNU General Public License v3. See license.txt


import json

import frappe
from frappe import _, throw
from frappe.model import child_table_fields, default_fields
from frappe.model.meta import get_field_precision
from frappe.query_builder.functions import CombineDatetime, IfNull, Sum
from frappe.utils import add_days, add_months, cint, cstr, flt, getdate

from erpnext import get_company_currency
from erpnext.accounts.doctype.pricing_rule.pricing_rule import (
	get_pricing_rule_for_item,
	set_transaction_type,
)
from erpnext.setup.doctype.brand.brand import get_brand_defaults
from erpnext.setup.doctype.item_group.item_group import get_item_group_defaults
from erpnext.setup.utils import get_exchange_rate
from erpnext.stock.doctype.item.item import get_item_defaults, get_uom_conv_factor
from erpnext.stock.doctype.item_manufacturer.item_manufacturer import get_item_manufacturer_part_no
from erpnext.stock.doctype.price_list.price_list import get_price_list_details

sales_doctypes = ["Quotation", "Sales Order", "Delivery Note", "Sales Invoice", "POS Invoice"]
purchase_doctypes = [
	"Material Request",
	"Supplier Quotation",
	"Purchase Order",
	"Purchase Receipt",
	"Purchase Invoice",
]


@frappe.whitelist()
def get_item_details(args, doc=None, for_validate=False, overwrite_warehouse=True):
	"""
	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": 0/1,
	        "ignore_pricing_rule": 0/1
	        "project": ""
	        "set_warehouse": ""
	}
	"""

	args = process_args(args)
	for_validate = process_string_args(for_validate)
	overwrite_warehouse = process_string_args(overwrite_warehouse)
	item = frappe.get_cached_doc("Item", args.item_code)
	validate_item_details(args, item)

	if isinstance(doc, str):
		doc = json.loads(doc)

	if doc:
		args["transaction_date"] = doc.get("transaction_date") or doc.get("posting_date")

		if doc.get("doctype") == "Purchase Invoice":
			args["bill_date"] = doc.get("bill_date")

	out = get_basic_details(args, item, overwrite_warehouse)

	get_item_tax_template(args, item, out)
	out["item_tax_rate"] = get_item_tax_map(
		args.company,
		args.get("item_tax_template")
		if out.get("item_tax_template") is None
		else out.get("item_tax_template"),
		as_json=True,
	)

	get_party_item_code(args, item, out)

	set_valuation_rate(out, args)

	update_party_blanket_order(args, out)

	# Never try to find a customer price if customer is set in these Doctype
	current_customer = args.customer
	if args.get("doctype") in ["Purchase Order", "Purchase Receipt", "Purchase Invoice"]:
		args.customer = None

	out.update(get_price_list_rate(args, item))

	args.customer = current_customer

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

	if (
		args.get("doctype") == "Material Request"
		and args.get("material_request_type") == "Material Transfer"
	):
		out.update(get_bin_details(args.item_code, args.get("from_warehouse")))

	elif out.get("warehouse"):
		if doc and doc.get("doctype") == "Purchase Order":
			# calculate company_total_stock only for po
			bin_details = get_bin_details(
				args.item_code, out.warehouse, args.company, include_child_warehouses=True
			)
		else:
			bin_details = get_bin_details(args.item_code, out.warehouse, include_child_warehouses=True)

		out.update(bin_details)

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

	data = get_pricing_rule_for_item(args, doc=doc, for_validate=for_validate)

	out.update(data)

	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"):
		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) * flt(out.rate)

	out = remove_standard_fields(out)
	return out


def remove_standard_fields(details):
	for key in child_table_fields + default_fields:
		details.pop(key, None)
	return details


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_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)

	if not out.serial_no:
		out.pop("serial_no", None)


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, str):
		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 not args.item_code and 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


def process_string_args(args):
	if isinstance(args, str):
		args = json.loads(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 cint(item.has_variants):
		msg = f"Item {item.name} is a template, please select one of its variants"

		throw(_(msg), title=_("Template Item Selected"))

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


def get_basic_details(args, item, overwrite_warehouse=True):
	"""
	: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": 0/1,
	                "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: "",
	                against_blanket_order: 0/1
	        }
	: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()

	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)

	defaults = frappe._dict(
		{
			"item_defaults": item_defaults,
			"item_group_defaults": item_group_defaults,
			"brand_defaults": brand_defaults,
		}
	)

	warehouse = get_item_warehouse(item, args, overwrite_warehouse, defaults)

	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
		)

	expense_account = None

	if args.get("doctype") == "Purchase Invoice" and item.is_fixed_asset:
		from erpnext.assets.doctype.asset_category.asset_category import get_asset_category_account

		expense_account = get_asset_category_account(
			fieldname="fixed_asset_account", item=args.item_code, company=args.company
		)

	# Set the UOM to the Default Sales UOM or Default Purchase UOM if configured in the Item Master
	if not args.get("uom"):
		if args.get("doctype") in sales_doctypes:
			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

	# Set stock UOM in args, so that it can be used while fetching item price
	args.stock_uom = item.stock_uom

	if args.get("batch_no") and item.name != frappe.get_cached_value(
		"Batch", args.get("batch_no"), "item"
	):
		args["batch_no"] = ""

	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": expense_account
			or get_default_expense_account(args, item_defaults, item_group_defaults, brand_defaults),
			"discount_account": get_default_discount_account(args, item_defaults),
			"provisional_expense_account": get_provisional_account(args, item_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": args.get("batch_no"),
			"uom": args.uom,
			"stock_uom": item.stock_uom,
			"min_order_qty": flt(item.min_order_qty) if args.doctype == "Material Request" else "",
			"qty": flt(args.qty) or 1.0,
			"stock_qty": flt(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,
			"discount_amount": flt(args.discount_amount) or 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,
			"last_purchase_rate": item.last_purchase_rate
			if args.get("doctype") in ["Purchase Order"]
			else 0,
			"transaction_date": args.get("transaction_date"),
			"against_blanket_order": args.get("against_blanket_order"),
			"bom_no": item.get("default_bom"),
			"weight_per_unit": args.get("weight_per_unit") or item.get("weight_per_unit"),
			"weight_uom": args.get("weight_uom") or item.get("weight_uom"),
			"grant_commission": item.get("grant_commission"),
		}
	)

	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.name, args.uom).get(
			"conversion_factor"
		)

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

	# calculate last purchase rate
	if args.get("doctype") in purchase_doctypes and not frappe.db.get_single_value(
		"Buying Settings", "disable_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.name, 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", "brand", "stock_uom"):
		out[fieldname] = item.get(fieldname)

	if args.get("manufacturer"):
		part_no = get_item_manufacturer_part_no(args.get("item_code"), args.get("manufacturer"))
		if part_no:
			out["manufacturer_part_no"] = part_no
		else:
			out["manufacturer_part_no"] = None
			out["manufacturer"] = None
	else:
		data = frappe.get_value(
			"Item", item.name, ["default_item_manufacturer", "default_manufacturer_part_no"], as_dict=1
		)

		if data:
			out.update(
				{
					"manufacturer": data.default_item_manufacturer,
					"manufacturer_part_no": data.default_manufacturer_part_no,
				}
			)

	child_doctype = args.doctype + " Item"
	meta = frappe.get_meta(child_doctype)
	if meta.get_field("barcode"):
		update_barcode_value(out)

	if out.get("weight_per_unit"):
		out["total_weight"] = out.weight_per_unit * out.stock_qty

	return out


def get_item_warehouse(item, args, overwrite_warehouse, defaults=None):
	if not defaults:
		defaults = frappe._dict(
			{
				"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),
			}
		)

	if overwrite_warehouse or not args.warehouse:
		warehouse = (
			args.get("set_warehouse")
			or defaults.item_defaults.get("default_warehouse")
			or defaults.item_group_defaults.get("default_warehouse")
			or defaults.brand_defaults.get("default_warehouse")
			or args.get("warehouse")
		)

		if not warehouse:
			defaults = frappe.defaults.get_defaults() or {}
			warehouse_exists = frappe.db.exists(
				"Warehouse", {"name": defaults.default_warehouse, "company": args.company}
			)
			if defaults.get("default_warehouse") and warehouse_exists:
				warehouse = defaults.default_warehouse

	else:
		warehouse = args.get("warehouse")

	if not warehouse:
		default_warehouse = frappe.db.get_single_value("Stock Settings", "default_warehouse")
		if frappe.db.get_value("Warehouse", default_warehouse, "company") == args.company:
			return default_warehouse

	return warehouse


def update_barcode_value(out):
	barcode_data = get_barcode_data([out])

	# If item has one barcode then update the value of the barcode field
	if barcode_data and len(barcode_data.get(out.item_code)) == 1:
		out["barcode"] = barcode_data.get(out.item_code)[0]


def get_barcode_data(items_list):
	# get itemwise batch no data
	# exmaple: {'LED-GRE': [Batch001, Batch002]}
	# where LED-GRE is item code, SN0001 is serial no and Pune is warehouse

	itemwise_barcode = {}
	for item in items_list:
		barcodes = frappe.db.get_all(
			"Item Barcode", filters={"parent": item.item_code}, fields="barcode"
		)

		for barcode in barcodes:
			if item.item_code not in itemwise_barcode:
				itemwise_barcode.setdefault(item.item_code, [])
			itemwise_barcode[item.item_code].append(barcode.get("barcode"))

	return itemwise_barcode


@frappe.whitelist()
def get_item_tax_info(company, tax_category, item_codes, item_rates=None, item_tax_templates=None):
	out = {}

	if item_tax_templates is None:
		item_tax_templates = {}

	if item_rates is None:
		item_rates = {}

	if isinstance(item_codes, (str,)):
		item_codes = json.loads(item_codes)

	if isinstance(item_rates, (str,)):
		item_rates = json.loads(item_rates)

	if isinstance(item_tax_templates, (str,)):
		item_tax_templates = json.loads(item_tax_templates)

	for item_code in item_codes:
		if not item_code or item_code[1] in out or not item_tax_templates.get(item_code[1]):
			continue

		out[item_code[1]] = {}
		item = frappe.get_cached_doc("Item", item_code[0])
		args = {
			"company": company,
			"tax_category": tax_category,
			"net_rate": item_rates.get(item_code[1]),
		}

		if item_tax_templates:
			args.update({"item_tax_template": item_tax_templates.get(item_code[1])})

		get_item_tax_template(args, item, out[item_code[1]])
		out[item_code[1]]["item_tax_rate"] = get_item_tax_map(
			company, out[item_code[1]].get("item_tax_template"), as_json=True
		)

	return out


def get_item_tax_template(args, item, out):
	"""
	args = {
	        "tax_category": None
	        "item_tax_template": None
	}
	"""
	item_tax_template = None
	if item.taxes:
		item_tax_template = _get_item_tax_template(args, item.taxes, out)

	if not item_tax_template:
		item_group = item.item_group
		while item_group and not item_tax_template:
			item_group_doc = frappe.get_cached_doc("Item Group", item_group)
			item_tax_template = _get_item_tax_template(args, item_group_doc.taxes, out)
			item_group = item_group_doc.parent_item_group


def _get_item_tax_template(args, taxes, out=None, for_validate=False):
	if out is None:
		out = {}
	taxes_with_validity = []
	taxes_with_no_validity = []

	for tax in taxes:
		tax_company = frappe.get_cached_value("Item Tax Template", tax.item_tax_template, "company")
		if tax_company == args["company"]:
			if tax.valid_from or tax.maximum_net_rate:
				# In purchase Invoice first preference will be given to supplier invoice date
				# if supplier date is not present then posting date
				validation_date = args.get("bill_date") or args.get("transaction_date")

				if getdate(tax.valid_from) <= getdate(validation_date) and is_within_valid_range(args, tax):
					taxes_with_validity.append(tax)
			else:
				taxes_with_no_validity.append(tax)

	if taxes_with_validity:
		taxes = sorted(
			taxes_with_validity, key=lambda i: i.valid_from or tax.maximum_net_rate, reverse=True
		)
	else:
		taxes = taxes_with_no_validity

	if for_validate:
		return [
			tax.item_tax_template
			for tax in taxes
			if (
				cstr(tax.tax_category) == cstr(args.get("tax_category"))
				and (tax.item_tax_template not in taxes)
			)
		]

	# all templates have validity and no template is valid
	if not taxes_with_validity and (not taxes_with_no_validity):
		return None

	# do not change if already a valid template
	if args.get("item_tax_template") in {t.item_tax_template for t in taxes}:
		out["item_tax_template"] = args.get("item_tax_template")
		return args.get("item_tax_template")

	for tax in taxes:
		if cstr(tax.tax_category) == cstr(args.get("tax_category")):
			out["item_tax_template"] = tax.item_tax_template
			return tax.item_tax_template
	return None


def is_within_valid_range(args, tax):
	if not flt(tax.maximum_net_rate):
		# No range specified, just ignore
		return True
	elif flt(tax.minimum_net_rate) <= flt(args.get("net_rate")) <= flt(tax.maximum_net_rate):
		return True

	return False


@frappe.whitelist()
def get_item_tax_map(company, item_tax_template, as_json=True):
	item_tax_map = {}
	if item_tax_template:
		template = frappe.get_cached_doc("Item Tax Template", item_tax_template)
		for d in template.taxes:
			if frappe.get_cached_value("Account", d.tax_type, "company") == company:
				item_tax_map[d.tax_type] = d.tax_rate

	return json.dumps(item_tax_map) if as_json else item_tax_map


@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_provisional_account(args, item):
	return item.get("default_provisional_account") or args.default_provisional_account


def get_default_discount_account(args, item):
	return item.get("default_discount_account") or args.discount_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=None, item_group=None, brand=None, company=None):
	cost_center = None

	if not company and args.get("company"):
		company = args.get("company")

	if args.get("project"):
		cost_center = frappe.db.get_value("Project", args.get("project"), "cost_center", cache=True)

	if not cost_center and (item and item_group and brand):
		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")
			)

	elif not cost_center and args.get("item_code") and company:
		for method in ["get_item_defaults", "get_item_group_defaults", "get_brand_defaults"]:
			path = "erpnext.stock.get_item_details.{0}".format(method)
			data = frappe.get_attr(path)(args.get("item_code"), company)

			if data and (data.selling_cost_center or data.buying_cost_center):
				return data.selling_cost_center or data.buying_cost_center

	if not cost_center and args.get("cost_center"):
		cost_center = args.get("cost_center")

	if (
		company
		and cost_center
		and frappe.get_cached_value("Cost Center", cost_center, "company") != company
	):
		return None

	if not cost_center and company:
		cost_center = frappe.get_cached_value("Company", company, "cost_center")

	return 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=None):
	if out is None:
		out = frappe._dict()

	meta = frappe.get_meta(args.parenttype or args.doctype)

	if meta.get_field("currency") or args.get("currency"):
		if not args.get("price_list_currency") or not args.get("plc_conversion_rate"):
			# if currency and plc_conversion_rate exist then
			# `get_price_list_currency_and_exchange_rate` has already been called
			pl_details = get_price_list_currency_and_exchange_rate(args)
			args.update(pl_details)

		if meta.get_field("currency"):
			validate_conversion_rate(args, meta)

		price_list_rate = get_price_list_rate_for(args, item_doc.name)

		# variant
		if price_list_rate is None and item_doc.variant_of:
			price_list_rate = get_price_list_rate_for(args, item_doc.variant_of)

		# insert in database
		if price_list_rate is None:
			if args.price_list and args.rate:
				insert_item_price(args)
			return out

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

		if frappe.db.get_single_value("Buying Settings", "disable_last_purchase_rate"):
			return out

		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))

	return out


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 = (
				(flt(args.rate) + flt(args.discount_amount)) / args.get("conversion_factor")
				if args.get("conversion_factor")
				else (flt(args.rate) + flt(args.discount_amount))
			)

			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 and frappe.db.get_single_value(
					"Stock Settings", "update_existing_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,
						"uom": args.stock_uom,
					}
				)
				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 desired qty is within the increment of the packing list.
	:param args: dict (or frappe._dict) with mandatory fields price_list, uom
	        optional fields transaction_date, customer, supplier
	:param item_code: str, Item Doctype field item_code
	"""

	ip = frappe.qb.DocType("Item Price")
	query = (
		frappe.qb.from_(ip)
		.select(ip.name, ip.price_list_rate, ip.uom)
		.where(
			(ip.item_code == item_code)
			& (ip.price_list == args.get("price_list"))
			& (IfNull(ip.uom, "").isin(["", args.get("uom")]))
			& (IfNull(ip.batch_no, "").isin(["", args.get("batch_no")]))
		)
		.orderby(ip.valid_from, order=frappe.qb.desc)
		.orderby(IfNull(ip.batch_no, ""), order=frappe.qb.desc)
		.orderby(ip.uom, order=frappe.qb.desc)
	)

	if not ignore_party:
		if args.get("customer"):
			query = query.where(ip.customer == args.get("customer"))
		elif args.get("supplier"):
			query = query.where(ip.supplier == args.get("supplier"))
		else:
			query = query.where((IfNull(ip.customer, "") == "") & (IfNull(ip.supplier, "") == ""))

	if args.get("transaction_date"):
		query = query.where(
			(IfNull(ip.valid_from, "2000-01-01") <= args["transaction_date"])
			& (IfNull(ip.valid_upto, "2500-12-31") >= args["transaction_date"])
		)

	return query.run()


def get_price_list_rate_for(args, item_code):
	"""
	: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: Desired 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"),
		"transaction_date": args.get("transaction_date"),
		"batch_no": args.get("batch_no"),
	}

	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 desired_qty and check_packing_list(price_list_rate[0][0], desired_qty, item_code):
			item_price_data = price_list_rate
	else:
		for field in ["customer", "supplier"]:
			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["uom"] = 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 desired qty is within the increment of the packing list.
	:param price_list_rate_name: Name of Item Price
	:param desired_qty: Desired Qt
	:param item_code: str, Item Doctype field item_code
	:param qty: Desired Qt
	"""

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

		if packing_increment != 0:
			flag = False

	return flag


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

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

	if (
		not args.ignore_conversion_rate
		and args.conversion_rate == 1
		and args.currency != company_currency
	):
		args.conversion_rate = (
			get_exchange_rate(args.currency, company_currency, args.transaction_date, "for_buying") or 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 args.price_list:
		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

		if args.quotation_to and args.quotation_to != "Customer":
			return

		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, include_child_warehouses=True
			).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"]

	pf = frappe.qb.DocType("POS Profile")
	pfu = frappe.qb.DocType("POS Profile User")

	query = (
		frappe.qb.from_(pf)
		.left_join(pfu)
		.on(pf.name == pfu.parent)
		.select(pf.star)
		.where((pfu.user == user) & (pfu.default == 1))
	)

	if company:
		query = query.where(pf.company == company)

	pos_profile = query.run(as_dict=True)

	if not pos_profile and company:
		pos_profile = (
			frappe.qb.from_(pf)
			.left_join(pfu)
			.on(pf.name == pfu.parent)
			.select(pf.star)
			.where((pf.company == company) & (pf.disabled == 0))
		).run(as_dict=True)

	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"):
		sn = frappe.qb.DocType("Serial No")
		query = (
			frappe.qb.from_(sn)
			.select(sn.name)
			.where((sn.item_code == args.item_code) & (sn.warehouse == args.warehouse))
			.orderby(CombineDatetime(sn.purchase_date, sn.purchase_time))
			.limit(abs(cint(args.stock_qty)))
		)

		if sales_order:
			query = query.where(sn.sales_order == sales_order)
		if args.batch_no:
			query = query.where(sn.batch_no == args.batch_no)

		serial_nos = query.run(as_list=True)
		serial_nos = [s[0] for s in serial_nos]

		return "\n".join(serial_nos)


@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, company=None, include_child_warehouses=False):
	bin_details = {"projected_qty": 0, "actual_qty": 0, "reserved_qty": 0}

	if warehouse:
		from frappe.query_builder.functions import Coalesce, Sum

		from erpnext.stock.doctype.warehouse.warehouse import get_child_warehouses

		warehouses = get_child_warehouses(warehouse) if include_child_warehouses else [warehouse]

		bin = frappe.qb.DocType("Bin")
		bin_details = (
			frappe.qb.from_(bin)
			.select(
				Coalesce(Sum(bin.projected_qty), 0).as_("projected_qty"),
				Coalesce(Sum(bin.actual_qty), 0).as_("actual_qty"),
				Coalesce(Sum(bin.reserved_qty), 0).as_("reserved_qty"),
			)
			.where((bin.item_code == item_code) & (bin.warehouse.isin(warehouses)))
		).run(as_dict=True)[0]

	if company:
		bin_details["company_total_stock"] = get_company_total_stock(item_code, company)

	return bin_details


def get_company_total_stock(item_code, company):
	bin = frappe.qb.DocType("Bin")
	wh = frappe.qb.DocType("Warehouse")

	return (
		frappe.qb.from_(bin)
		.inner_join(wh)
		.on(bin.warehouse == wh.name)
		.select(Sum(bin.actual_qty))
		.where((wh.company == company) & (bin.item_code == item_code))
	).run()[0][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=None, 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)
	args.update(parent)

	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_doc = frappe.db.get_value("Item", args.item_code, ["name", "variant_of"], as_dict=1)
	item_details = get_price_list_rate(args, item_doc)
	item_details.update(get_pricing_rule_for_item(args))

	return item_details


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_details = get_price_list_details(args.price_list)

	price_list_currency = price_list_details.get("currency")
	price_list_uom_dependant = price_list_details.get("price_list_uom_dependant")

	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 or 1,
		}
	)


@frappe.whitelist()
def get_default_bom(item_code=None):
	def _get_bom(item):
		bom = frappe.get_all(
			"BOM", dict(item=item, is_active=True, is_default=True, docstatus=1), limit=1
		)
		return bom[0].name if bom else None

	if not item_code:
		return

	bom_name = _get_bom(item_code)

	template_item = frappe.db.get_value("Item", item_code, "variant_of")
	if not bom_name and template_item:
		bom_name = _get_bom(template_item)

	return bom_name


@frappe.whitelist()
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"):
		pi_item = frappe.qb.DocType("Purchase Invoice Item")
		valuation_rate = (
			frappe.qb.from_(pi_item)
			.select((Sum(pi_item.base_net_amount) / Sum(pi_item.qty * pi_item.conversion_factor)))
			.where((pi_item.docstatus == 1) & (pi_item.item_code == item_code))
		).run()

		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, str):
		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_nos_by_fifo(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):
	if out["against_blanket_order"]:
		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, str):
		args = frappe._dict(json.loads(args))

	blanket_order_details = None

	if args.item_code:
		bo = frappe.qb.DocType("Blanket Order")
		bo_item = frappe.qb.DocType("Blanket Order Item")

		query = (
			frappe.qb.from_(bo)
			.from_(bo_item)
			.select(bo_item.rate.as_("blanket_order_rate"), bo.name.as_("blanket_order"))
			.where(
				(bo.company == args.company)
				& (bo_item.item_code == args.item_code)
				& (bo.docstatus == 1)
				& (bo.name == bo_item.parent)
			)
		)

		if args.customer and args.doctype == "Sales Order":
			query = query.where(bo.customer == args.customer)
		elif args.supplier and args.doctype == "Purchase Order":
			query = query.where(bo.supplier == args.supplier)
		if args.blanket_order:
			query = query.where(bo.name == args.blanket_order)
		if args.transaction_date:
			query = query.where(bo.to_date >= args.transaction_date)

		blanket_order_details = query.run(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.get_all(
			"Sales Invoice Item",
			filters={
				"parent": args.get("against_sales_invoice"),
				"item_code": args.get("item_code"),
				"docstatus": 1,
			},
			fields="sales_order",
		)
		if sales_order and sales_order[0]:
			if get_reserved_qty_for_so(sales_order[0].sales_order, 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.get_value(
		"Sales Order Item",
		filters={
			"parent": sales_order,
			"item_code": item_code,
			"ensure_delivery_based_on_produced_serial_no": 1,
		},
		fieldname="sum(qty)",
	)

	return reserved_qty or 0