# Copyright (c) 2013, Havenir Solutions and contributors
# For license information, please see license.txt


import json

import frappe
from frappe import _
from frappe.utils import get_url_to_list


def execute(filters=None):
	columns = columns = get_columns()
	data = get_data(filters)
	return columns, data


def get_columns():
	return [
		{
			"fieldname": "title",
			"label": _("Title"),
			"fieldtype": "Data",
			"width": 300,
		},
		{
			"fieldname": "amount",
			"label": _("Amount (SAR)"),
			"fieldtype": "Currency",
			"options": "currency",
			"width": 150,
		},
		{
			"fieldname": "adjustment_amount",
			"label": _("Adjustment (SAR)"),
			"fieldtype": "Currency",
			"options": "currency",
			"width": 150,
		},
		{
			"fieldname": "vat_amount",
			"label": _("VAT Amount (SAR)"),
			"fieldtype": "Currency",
			"options": "currency",
			"width": 150,
		},
		{
			"fieldname": "currency",
			"label": _("Currency"),
			"fieldtype": "Currency",
			"width": 150,
			"hidden": 1,
		},
	]


def get_data(filters):
	data = []

	# Validate if vat settings exist
	company = filters.get("company")
	company_currency = frappe.get_cached_value("Company", company, "default_currency")

	if frappe.db.exists("KSA VAT Setting", company) is None:
		url = get_url_to_list("KSA VAT Setting")
		frappe.msgprint(_('Create <a href="{}">KSA VAT Setting</a> for this company').format(url))
		return data

	ksa_vat_setting = frappe.get_doc("KSA VAT Setting", company)

	# Sales Heading
	append_data(data, "VAT on Sales", "", "", "", company_currency)

	grand_total_taxable_amount = 0
	grand_total_taxable_adjustment_amount = 0
	grand_total_tax = 0

	for vat_setting in ksa_vat_setting.ksa_vat_sales_accounts:
		(
			total_taxable_amount,
			total_taxable_adjustment_amount,
			total_tax,
		) = get_tax_data_for_each_vat_setting(vat_setting, filters, "Sales Invoice")

		# Adding results to data
		append_data(
			data,
			vat_setting.title,
			total_taxable_amount,
			total_taxable_adjustment_amount,
			total_tax,
			company_currency,
		)

		grand_total_taxable_amount += total_taxable_amount
		grand_total_taxable_adjustment_amount += total_taxable_adjustment_amount
		grand_total_tax += total_tax

	# Sales Grand Total
	append_data(
		data,
		"Grand Total",
		grand_total_taxable_amount,
		grand_total_taxable_adjustment_amount,
		grand_total_tax,
		company_currency,
	)

	# Blank Line
	append_data(data, "", "", "", "", company_currency)

	# Purchase Heading
	append_data(data, "VAT on Purchases", "", "", "", company_currency)

	grand_total_taxable_amount = 0
	grand_total_taxable_adjustment_amount = 0
	grand_total_tax = 0

	for vat_setting in ksa_vat_setting.ksa_vat_purchase_accounts:
		(
			total_taxable_amount,
			total_taxable_adjustment_amount,
			total_tax,
		) = get_tax_data_for_each_vat_setting(vat_setting, filters, "Purchase Invoice")

		# Adding results to data
		append_data(
			data,
			vat_setting.title,
			total_taxable_amount,
			total_taxable_adjustment_amount,
			total_tax,
			company_currency,
		)

		grand_total_taxable_amount += total_taxable_amount
		grand_total_taxable_adjustment_amount += total_taxable_adjustment_amount
		grand_total_tax += total_tax

	# Purchase Grand Total
	append_data(
		data,
		"Grand Total",
		grand_total_taxable_amount,
		grand_total_taxable_adjustment_amount,
		grand_total_tax,
		company_currency,
	)

	return data


def get_tax_data_for_each_vat_setting(vat_setting, filters, doctype):
	"""
	(KSA, {filters}, 'Sales Invoice') => 500, 153, 10 \n
	calculates and returns \n
	total_taxable_amount, total_taxable_adjustment_amount, total_tax"""
	from_date = filters.get("from_date")
	to_date = filters.get("to_date")

	# Initiate variables
	total_taxable_amount = 0
	total_taxable_adjustment_amount = 0
	total_tax = 0
	# Fetch All Invoices
	invoices = frappe.get_all(
		doctype,
		filters={"docstatus": 1, "posting_date": ["between", [from_date, to_date]]},
		fields=["name", "is_return"],
	)

	for invoice in invoices:
		invoice_items = frappe.get_all(
			f"{doctype} Item",
			filters={
				"docstatus": 1,
				"parent": invoice.name,
				"item_tax_template": vat_setting.item_tax_template,
			},
			fields=["item_code", "net_amount"],
		)

		for item in invoice_items:
			# Summing up total taxable amount
			if invoice.is_return == 0:
				total_taxable_amount += item.net_amount

			if invoice.is_return == 1:
				total_taxable_adjustment_amount += item.net_amount

			# Summing up total tax
			total_tax += get_tax_amount(item.item_code, vat_setting.account, doctype, invoice.name)

	return total_taxable_amount, total_taxable_adjustment_amount, total_tax


def append_data(data, title, amount, adjustment_amount, vat_amount, company_currency):
	"""Returns data with appended value."""
	data.append(
		{
			"title": _(title),
			"amount": amount,
			"adjustment_amount": adjustment_amount,
			"vat_amount": vat_amount,
			"currency": company_currency,
		}
	)


def get_tax_amount(item_code, account_head, doctype, parent):
	if doctype == "Sales Invoice":
		tax_doctype = "Sales Taxes and Charges"

	elif doctype == "Purchase Invoice":
		tax_doctype = "Purchase Taxes and Charges"

	item_wise_tax_detail = frappe.get_value(
		tax_doctype,
		{"docstatus": 1, "parent": parent, "account_head": account_head},
		"item_wise_tax_detail",
	)

	tax_amount = 0
	if item_wise_tax_detail and len(item_wise_tax_detail) > 0:
		item_wise_tax_detail = json.loads(item_wise_tax_detail)
		for key, value in item_wise_tax_detail.items():
			if key == item_code:
				tax_amount = value[1]
				break

	return tax_amount