# 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, json
from frappe.utils.nestedset import get_root_of
from frappe.utils import cint
from erpnext.accounts.doctype.pos_profile.pos_profile import get_item_groups
from erpnext.accounts.doctype.pos_invoice.pos_invoice import get_stock_availability

from six import string_types

@frappe.whitelist()
def get_items(start, page_length, price_list, item_group, pos_profile, search_value=""):
	data = dict()
	result = []
	warehouse, show_only_available_items = "", False

	allow_negative_stock = frappe.db.get_single_value('Stock Settings', 'allow_negative_stock')
	if not allow_negative_stock:
		warehouse, show_only_available_items = frappe.db.get_value('POS Profile', pos_profile, ['warehouse', 'show_only_available_items'])

	if not frappe.db.exists('Item Group', item_group):
		item_group = get_root_of('Item Group')

	if search_value:
		data = search_serial_or_batch_or_barcode_number(search_value)
	
	item_code = data.get("item_code") if data.get("item_code") else search_value
	serial_no = data.get("serial_no") if data.get("serial_no") else ""
	batch_no = data.get("batch_no") if data.get("batch_no") else ""
	barcode = data.get("barcode") if data.get("barcode") else ""

	if data:
		item_info = frappe.db.get_value(
			"Item", data.get("item_code"), 
			["name as item_code", "item_name", "description", "stock_uom", "image as item_image", "is_stock_item"]
		, as_dict=1)
		item_info.setdefault('serial_no', serial_no)
		item_info.setdefault('batch_no', batch_no)
		item_info.setdefault('barcode', barcode)

		return { 'items': [item_info] }

	condition = get_conditions(item_code, serial_no, batch_no, barcode)
	condition += get_item_group_condition(pos_profile)

	lft, rgt = frappe.db.get_value('Item Group', item_group, ['lft', 'rgt'])

	bin_join_selection, bin_join_condition = "", ""
	if show_only_available_items:
		bin_join_selection = ", `tabBin` bin"
		bin_join_condition = "AND bin.warehouse = %(warehouse)s AND bin.item_code = item.name AND bin.actual_qty > 0"

	items_data = frappe.db.sql("""
		SELECT
			item.name AS item_code,
			item.item_name,
			item.description,
			item.stock_uom,
			item.image AS item_image,
			item.is_stock_item
		FROM
			`tabItem` item {bin_join_selection}
		WHERE
			item.disabled = 0
			AND item.has_variants = 0
			AND item.is_sales_item = 1
			AND item.is_fixed_asset = 0
			AND item.item_group in (SELECT name FROM `tabItem Group` WHERE lft >= {lft} AND rgt <= {rgt})
			AND {condition}
			{bin_join_condition}
		ORDER BY
			item.name asc
		LIMIT
			{start}, {page_length}"""
		.format(
			start=start,
			page_length=page_length,
			lft=lft,
			rgt=rgt,
			condition=condition,
			bin_join_selection=bin_join_selection,
			bin_join_condition=bin_join_condition
		), {'warehouse': warehouse}, as_dict=1)

	if items_data:
		items = [d.item_code for d in items_data]
		item_prices_data = frappe.get_all("Item Price",
			fields = ["item_code", "price_list_rate", "currency"],
			filters = {'price_list': price_list, 'item_code': ['in', items]})

		item_prices = {}
		for d in item_prices_data:
			item_prices[d.item_code] = d

		for item in items_data:
			item_code = item.item_code
			item_price = item_prices.get(item_code) or {}
			if not allow_negative_stock:
				item_stock_qty = frappe.db.sql("""select ifnull(sum(actual_qty), 0) from `tabBin` where item_code = %s""", item_code)[0][0]
			else:
				item_stock_qty = get_stock_availability(item_code, warehouse)

			row = {}
			row.update(item)
			row.update({
				'price_list_rate': item_price.get('price_list_rate'),
				'currency': item_price.get('currency'),
				'actual_qty': item_stock_qty,
			})
			result.append(row)

	res = {
		'items': result
	}

	return res

@frappe.whitelist()
def search_serial_or_batch_or_barcode_number(search_value):
	# search barcode no
	barcode_data = frappe.db.get_value('Item Barcode', {'barcode': search_value}, ['barcode', 'parent as item_code'], as_dict=True)
	if barcode_data:
		return barcode_data

	# search serial no
	serial_no_data = frappe.db.get_value('Serial No', search_value, ['name as serial_no', 'item_code'], as_dict=True)
	if serial_no_data:
		return serial_no_data

	# search batch no
	batch_no_data = frappe.db.get_value('Batch', search_value, ['name as batch_no', 'item as item_code'], as_dict=True)
	if batch_no_data:
		return batch_no_data

	return {}

def get_conditions(item_code, serial_no, batch_no, barcode):
	if serial_no or batch_no or barcode:
		return "item.name = {0}".format(frappe.db.escape(item_code))

	return """(item.name like {item_code}
		or item.item_name like {item_code})""".format(item_code = frappe.db.escape('%' + item_code + '%'))

def get_item_group_condition(pos_profile):
	cond = "and 1=1"
	item_groups = get_item_groups(pos_profile)
	if item_groups:
		cond = "and item.item_group in (%s)"%(', '.join(['%s']*len(item_groups)))

	return cond % tuple(item_groups)

@frappe.whitelist()
@frappe.validate_and_sanitize_search_inputs
def item_group_query(doctype, txt, searchfield, start, page_len, filters):
	item_groups = []
	cond = "1=1"
	pos_profile= filters.get('pos_profile')

	if pos_profile:
		item_groups = get_item_groups(pos_profile)

		if item_groups:
			cond = "name in (%s)"%(', '.join(['%s']*len(item_groups)))
			cond = cond % tuple(item_groups)

	return frappe.db.sql(""" select distinct name from `tabItem Group`
			where {condition} and (name like %(txt)s) limit {start}, {page_len}"""
		.format(condition = cond, start=start, page_len= page_len),
			{'txt': '%%%s%%' % txt})

@frappe.whitelist()
def check_opening_entry(user):
	open_vouchers = frappe.db.get_all("POS Opening Entry",
		filters = {
			"user": user,
			"pos_closing_entry": ["in", ["", None]],
			"docstatus": 1
		},
		fields = ["name", "company", "pos_profile", "period_start_date"],
		order_by = "period_start_date desc"
	)

	return open_vouchers

@frappe.whitelist()
def create_opening_voucher(pos_profile, company, balance_details):
	import json
	balance_details = json.loads(balance_details)

	new_pos_opening = frappe.get_doc({
		'doctype': 'POS Opening Entry',
		"period_start_date": frappe.utils.get_datetime(),
		"posting_date": frappe.utils.getdate(),
		"user": frappe.session.user,
		"pos_profile": pos_profile,
		"company": company,
	})
	new_pos_opening.set("balance_details", balance_details)
	new_pos_opening.submit()

	return new_pos_opening.as_dict()

@frappe.whitelist()
def get_past_order_list(search_term, status, limit=20):
	fields = ['name', 'grand_total', 'currency', 'customer', 'posting_time', 'posting_date']
	invoice_list = []

	if search_term and status:
		invoices_by_customer = frappe.db.get_all('POS Invoice', filters={
			'customer': ['like', '%{}%'.format(search_term)],
			'status': status
		}, fields=fields)
		invoices_by_name = frappe.db.get_all('POS Invoice', filters={
			'name': ['like', '%{}%'.format(search_term)],
			'status': status
		}, fields=fields)

		invoice_list = invoices_by_customer + invoices_by_name
	elif status:
		invoice_list = frappe.db.get_all('POS Invoice', filters={
			'status': status
		}, fields=fields)

	return invoice_list

@frappe.whitelist()
def set_customer_info(fieldname, customer, value=""):
	if fieldname == 'loyalty_program':
		frappe.db.set_value('Customer', customer, 'loyalty_program', value)

	contact = frappe.get_cached_value('Customer', customer, 'customer_primary_contact')

	if contact:
		contact_doc = frappe.get_doc('Contact', contact)
		if fieldname == 'email_id':
			contact_doc.set('email_ids', [{ 'email_id': value, 'is_primary': 1}])
			frappe.db.set_value('Customer', customer, 'email_id', value)
		elif fieldname == 'mobile_no':
			contact_doc.set('phone_nos', [{ 'phone': value, 'is_primary_mobile_no': 1}])
			frappe.db.set_value('Customer', customer, 'mobile_no', value)
		contact_doc.save()