"""
Copyright (c) 2014 Congressus, The Netherlands
Copyright (c) 2017-2023 Raphael Michel and contributors

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is furnished
to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""
import xml.etree.ElementTree as ET
from collections import OrderedDict

from .utils import decimal_str_to_int, int_to_decimal_str, make_msg_id
from .validation import try_valid_xml


class SepaPaymentInitn:

    def __init__(self, config, schema, clean=True):
        """
        Constructor. Checks the config, prepares the document and
        builds the header.
        @param param: The config dict.
        @raise exception: When the config file is invalid.
        """
        self._config = None  # Will contain the config file.
        self._xml = None  # Will contain the final XML file.
        self._batches = OrderedDict()  # Will contain the SEPA batches.
        self._batch_totals = OrderedDict()  # Will contain the total amount to debit per batch for checksum total.
        self.schema = schema
        self.msg_id = make_msg_id()
        self.clean = clean

        config_result = self.check_config(config)
        if config_result:
            self._config = config
            if self.clean:
                from text_unidecode import unidecode

                self._config['name'] = unidecode(self._config['name'])[:70]

        self._prepare_document()
        self._create_header()

    def _prepare_document(self):
        """
        Build the main document node and set xml namespaces.
        """
        self._xml = ET.Element("Document")
        self._xml.set("xmlns",
                      "urn:iso:std:iso:20022:tech:xsd:" + self.schema)
        self._xml.set("xmlns:xsi",
                      "http://www.w3.org/2001/XMLSchema-instance")
        ET.register_namespace("",
                              "urn:iso:std:iso:20022:tech:xsd:" + self.schema)
        ET.register_namespace("xsi",
                              "http://www.w3.org/2001/XMLSchema-instance")
        n = ET.Element(self.root_el)
        self._xml.append(n)

    def _create_header(self):
        raise NotImplementedError()

    def _finalize_batch(self):
        raise NotImplementedError()

    def export(self, validate=True, pretty_print=False):
        """
        Method to output the xml as string. It will finalize the batches and
        then calculate the checksums (amount sum and transaction count),
        fill these into the group header and output the XML.

        @param pretty_print: uses Python's xml.dom.minidom.Node.toprettyxml to make it easier to read for humans
        """
        self._finalize_batch()

        ctrl_sum_total = 0
        nb_of_txs_total = 0

        for ctrl_sum in self._xml.iter('CtrlSum'):
            if ctrl_sum.text is None:
                continue
            ctrl_sum_total += decimal_str_to_int(ctrl_sum.text)

        for nb_of_txs in self._xml.iter('NbOfTxs'):
            if nb_of_txs.text is None:
                continue
            nb_of_txs_total += int(nb_of_txs.text)

        n = self._xml.find(self.root_el)
        GrpHdr_node = n.find('GrpHdr')
        CtrlSum_node = GrpHdr_node.find('CtrlSum')
        NbOfTxs_node = GrpHdr_node.find('NbOfTxs')
        CtrlSum_node.text = int_to_decimal_str(ctrl_sum_total)
        NbOfTxs_node.text = str(nb_of_txs_total)

        # Prepending the XML version is hacky, but cElementTree only offers this
        # automatically if you write to a file, which we don't necessarily want.
        out = b"<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + ET.tostring(
            self._xml, "utf-8")

        if pretty_print:
            from xml.dom import minidom
            out_minidom = minidom.parseString(out)
            out = out_minidom.toprettyxml(encoding="utf-8")

        if validate:
            try_valid_xml(out, self.schema)
        return out