import datetime
from typing import List
from uuid import uuid4
from xml.dom import minidom
from xml.etree.ElementTree import Element, SubElement, tostring

from vbv_lernwelt.shop.invoice.creator import InvoiceCreator, Item
from vbv_lernwelt.shop.invoice.repositories import InvoiceRepository


class AbacusInvoiceCreator(InvoiceCreator):
    def __init__(self, repository: InvoiceRepository):
        self.repository = repository

    def create_invoice(
        self,
        customer_number: str,
        purchase_order_date: datetime.date,
        delivery_date: datetime.date,
        reference_purchase_order: str,
        unic_id: str,
        items: List[Item],
        filename: str = None,
    ):
        invoice = self.render_invoice(
            customer_number,
            purchase_order_date,
            delivery_date,
            reference_purchase_order,
            unic_id,
            items,
        )

        if filename is None:
            filename = f"vbv-vv-{uuid4().hex}.xml"

        self.repository.upload_invoice(invoice, filename)

    @staticmethod
    def render_invoice(
        customer_number: str,
        purchase_order_date: datetime.date,
        delivery_date: datetime.date,
        reference_purchase_order: str,
        unic_id: str,
        items: List[Item],
    ) -> str:
        container = Element("AbaConnectContainer")
        task = SubElement(container, "Task")
        parameter = SubElement(task, "Parameter")
        SubElement(parameter, "Application").text = "ORDE"
        SubElement(parameter, "Id").text = "Verkaufsauftrag"
        SubElement(parameter, "MapId").text = "AbaDefault"
        SubElement(parameter, "Version").text = "2022.00"

        transaction = SubElement(task, "Transaction")
        sales_order_header = SubElement(transaction, "SalesOrderHeader", mode="SAVE")
        sales_order_header_fields = SubElement(
            sales_order_header, "SalesOrderHeaderFields", mode="SAVE"
        )

        SubElement(sales_order_header_fields, "CustomerNumber").text = customer_number
        SubElement(
            sales_order_header_fields, "PurchaseOrderDate"
        ).text = purchase_order_date.isoformat()
        SubElement(
            sales_order_header_fields, "DeliveryDate"
        ).text = delivery_date.isoformat()
        SubElement(
            sales_order_header_fields, "ReferencePurchaseOrder"
        ).text = reference_purchase_order
        SubElement(sales_order_header_fields, "UnicId").text = unic_id

        for index, item in enumerate(items, start=1):
            item_element = SubElement(sales_order_header, "Item", mode="SAVE")
            item_fields = SubElement(item_element, "ItemFields", mode="SAVE")
            SubElement(item_fields, "ItemNumber").text = str(index)
            SubElement(item_fields, "ProductNumber").text = item.product_number
            SubElement(item_fields, "QuantityOrdered").text = item.quantity

            item_text = SubElement(item_element, "ItemText", mode="SAVE")
            item_text_fields = SubElement(item_text, "ItemTextFields", mode="SAVE")
            SubElement(item_text_fields, "Text").text = item.description

        return AbacusInvoiceCreator.create_xml_string(container)

    @staticmethod
    def create_xml_string(container: Element, encoding: str = "UTF-8") -> str:
        xml_bytes = tostring(container, encoding)
        xml_pretty_str = minidom.parseString(xml_bytes).toprettyxml(
            indent="  ", encoding=encoding
        )
        return xml_pretty_str.decode(encoding)