# Copyright 2015 Antonio Espinosa <antonio.espinosa@tecnativa.com>
# Copyright 2016 Jairo Llopis <jairo.llopis@tecnativa.com>
# Copyright 2017 David Vidal <jairo.llopis@tecnativa.com>
# Copyright 2021 Andrii Skrypka <andrijskrypa@ukr.net>
# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).

import logging
import re
from collections import OrderedDict

import requests
from lxml import etree

from flectra import _, api, fields, models
from flectra.exceptions import UserError

logger = logging.getLogger(__name__)

# Default server values
URL_BASE = "http://ec.europa.eu"
URL_PATH = "/eurostat/ramon/nomenclatures/index.cfm"
URL_PARAMS = {
    "TargetUrl": "ACT_OTH_CLS_DLD",
    "StrNom": "NUTS_2013",
    "StrFormat": "XML",
    "StrLanguageCode": "EN",
    "StrLayoutCode": "HIERARCHIC",
}


class NutsImport(models.TransientModel):
    _name = "nuts.import"
    _description = "Import NUTS items from European RAMON service"
    _parents = [False, False, False, False]
    _countries = {
        "BE": False,
        "BG": False,
        "CZ": False,
        "DK": False,
        "DE": False,
        "EE": False,
        "IE": False,
        "GR": False,  # EL
        "ES": False,
        "FR": False,
        "HR": False,
        "IT": False,
        "CY": False,
        "LV": False,
        "LT": False,
        "LU": False,
        "HU": False,
        "MT": False,
        "NL": False,
        "AT": False,
        "PL": False,
        "PT": False,
        "RO": False,
        "SI": False,
        "SK": False,
        "FI": False,
        "SE": False,
        "GB": False,  # UK
    }
    _map = OrderedDict(
        [
            (
                "level",
                {"xpath": "", "attrib": "idLevel", "type": "integer", "required": True},
            ),
            (
                "code",
                {
                    "xpath": './Label/LabelText[@language="ALL"]',
                    "type": "string",
                    "required": True,
                },
            ),
            (
                "name",
                {
                    "xpath": './Label/LabelText[@language="EN"]',
                    "type": "string",
                    "required": True,
                },
            ),
        ]
    )
    current_country_id = fields.Many2one("res.country")

    def _check_node(self, node):
        if node.get("id") and node.get("idLevel"):
            return True
        return False

    def _mapping(self, node):
        item = {}
        for k, v in self._map.items():
            field_xpath = v.get("xpath", "")
            field_attrib = v.get("attrib", False)
            field_type = v.get("type", "string")
            field_required = v.get("required", False)
            value = ""
            if field_xpath:
                n = node.find(field_xpath)
            else:
                n = node
            if n is not None:
                if field_attrib:
                    value = n.get(field_attrib, "")
                else:
                    value = n.text
                if field_type == "integer":
                    try:
                        value = int(value)
                    except (ValueError, TypeError):
                        logger.warning(
                            "Value {} for field {} replaced by 0".format(value, k)
                        )
                        value = 0
            else:
                logger.debug("xpath = '%s', not found" % field_xpath)
            if field_required and not value:
                raise UserError(_("Value not found for mandatory field %s" % k))
            item[k] = value
        return item

    def _download_nuts(self, url_base=None, url_path=None, url_params=None):
        if not url_base:
            url_base = URL_BASE
        if not url_path:
            url_path = URL_PATH
        if not url_params:
            url_params = URL_PARAMS
        url = url_base + url_path + "?"
        url += "&".join([k + "=" + v for k, v in url_params.items()])
        logger.info("Starting to download %s" % url)
        try:
            res_request = requests.get(url)
        except Exception as e:
            raise UserError(
                _("Got an error when trying to download the file: %s.") % str(e)
            )
        if res_request.status_code != requests.codes.ok:
            raise UserError(
                _("Got an error %d when trying to download the file %s.")
                % (res_request.status_code, url)
            )
        logger.info("Download successfully %d bytes" % len(res_request.content))
        # Workaround XML: Remove all characters before <?xml
        pattern = re.compile(rb"^.*<\?xml", re.DOTALL)
        content_fixed = re.sub(pattern, b"<?xml", res_request.content)
        if not re.match(rb"<\?xml", content_fixed):
            raise UserError(_("Downloaded file is not a valid XML file"))
        return content_fixed

    @api.model
    def _load_countries(self):
        for k in self._countries:
            self._countries[k] = self.env["res.country"].search([("code", "=", k)])
        # Workaround to translate some country codes:
        #   EL => GR (Greece)
        #   UK => GB (United Kingdom)
        self._countries["EL"] = self._countries["GR"]
        self._countries["UK"] = self._countries["GB"]

    @api.model
    def state_mapping(self, data, node):
        # Method to inherit and add state_id relation depending on country
        level = data.get("level", 0)
        code = data.get("code", "")
        if level == 1:
            self.current_country_id = self._countries[code]
        return {"country_id": self.current_country_id.id}

    @api.model
    def create_or_update_nuts(self, node):
        if not self._check_node(node):
            return False

        nuts_model = self.env["res.partner.nuts"]
        data = self._mapping(node)
        data.update(self.state_mapping(data, node))
        level = data.get("level", 0)
        if 2 <= level <= 5:
            data["parent_id"] = self._parents[level - 2]
        nuts = nuts_model.search(
            [("level", "=", data["level"]), ("code", "=", data["code"])]
        )
        if nuts:
            nuts.filtered(lambda n: not n.not_updatable).write(data)
        else:
            nuts = nuts_model.create(data)
        if 1 <= level <= 4:
            self._parents[level - 1] = nuts.id
        return nuts

    def run_import(self):
        nuts_model = self.env["res.partner.nuts"].with_context(
            defer_parent_store_computation=True
        )
        self._load_countries()
        # All current NUTS (for available countries),
        #   delete if not found above
        nuts_to_delete = nuts_model.search(
            [
                ("country_id", "in", [x.id for x in self._countries.values()]),
                ("not_updatable", "=", False),
            ]
        )
        # Download NUTS in english, create or update
        logger.info("Importing NUTS 2013 English...")
        xmlcontent = self._download_nuts()
        dom = etree.fromstring(xmlcontent)
        for node in dom.iter("Item"):
            logger.debug(
                "Reading level=%s, id=%s",
                node.get("idLevel", "N/A"),
                node.get("id", "N/A"),
            )
            nuts = self.create_or_update_nuts(node)
            if nuts and nuts in nuts_to_delete:
                nuts_to_delete -= nuts
        # Delete obsolete NUTS
        if nuts_to_delete:
            logger.info("%d NUTS entries deleted" % len(nuts_to_delete))
            nuts_to_delete.unlink()
        logger.info(
            "The wizard to create NUTS entries from RAMON "
            "has been successfully completed."
        )
        return {
            "type": "ir.actions.client",
            "tag": "reload",
        }