# -*- coding: utf-8 -*-
##############################################################################
#
#    Intrastat base module for Odoo
#    Copyright (C) 2010-2014 Akretion (http://www.akretion.com/).
#    @author Alexis de Lattre <alexis.delattre@akretion.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as
#    published by the Free Software Foundation, either version 3 of the
#    License, or (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################

from openerp import models, fields, api, tools, _
from openerp.exceptions import Warning as UserError
import logging

logger = logging.getLogger(__name__)


class IntrastatCommon(models.AbstractModel):
    _name = "intrastat.common"
    _description = "Common functions for intrastat reports for products "
    "and services"

    @api.one
    @api.depends('declaration_line_ids.amount_company_currency')
    def _compute_numbers(self):
        total_amount = 0  # it is an integer
        num_lines = 0
        for line in self.declaration_line_ids:
            total_amount += line.amount_company_currency
            num_lines += 1
        self.num_decl_lines = num_lines
        self.total_amount = total_amount

    @api.one
    def _check_generate_lines(self):
        """Check wether all requirements are met for generating lines."""
        if not self.company_id:
            raise UserError(_("Company not yet set on intrastat report."))
        company_obj = self.company_id
        if not company_obj.country_id:
            raise UserError(
                _("The country is not set on the company '%s'.")
                % company_obj.name)
        if company_obj.currency_id.name != 'EUR':
            raise UserError(
                _("The company currency must be 'EUR', but is currently '%s'.")
                % company_obj.currency_id.name)
        return True

    @api.one
    def _check_generate_xml(self):
        if not self.company_id.partner_id.vat:
            raise UserError(
                _("The VAT number is not set for the partner '%s'.")
                % self.company_id.partner_id.name)
        return True

    @api.model
    def _check_xml_schema(self, xml_string, xsd_file):
        '''Validate the XML file against the XSD'''
        from lxml import etree
        from StringIO import StringIO
        xsd_etree_obj = etree.parse(
            tools.file_open(xsd_file))
        official_schema = etree.XMLSchema(xsd_etree_obj)
        try:
            t = etree.parse(StringIO(xml_string))
            official_schema.assertValid(t)
        except Exception, e:
            # if the validation of the XSD fails, we arrive here
            logger = logging.getLogger(__name__)
            logger.warning(
                "The XML file is invalid against the XML Schema Definition")
            logger.warning(xml_string)
            logger.warning(e)
            raise UserError(
                _("The generated XML file is not valid against the official "
                    "XML Schema Definition. The generated XML file and the "
                    "full error have been written in the server logs. "
                    "Here is the error, which may give you an idea on the "
                    "cause of the problem : %s.")
                % str(e))
        return True

    @api.multi
    def _attach_xml_file(self, xml_string, declaration_name):
        '''Attach the XML file to the report_intrastat_product/service
        object'''
        self.ensure_one()
        import base64
        filename = '%s_%s.xml' % (self.year_month, declaration_name)
        attach = self.env['ir.attachment'].create({
            'name': filename,
            'res_id': self.id,
            'res_model': self._name,
            'datas': base64.encodestring(xml_string),
            'datas_fname': filename})
        return attach.id

    @api.multi
    def _unlink_attachments(self):
        atts = self.env['ir.attachment'].search(
            [('res_model', '=', self._name),
             ('res_id', '=', self.id)])
        atts.unlink()

    @api.model
    def _open_attach_view(self, attach_id, title='XML file'):
        '''Returns an action which opens the form view of the
        corresponding attachement'''
        action = {
            'name': title,
            'view_type': 'form',
            'view_mode': 'form',
            'res_model': 'ir.attachment',
            'type': 'ir.actions.act_window',
            'nodestroy': True,
            'target': 'current',
            'res_id': attach_id,
            }
        return action

    @api.multi
    def _generate_xml(self):
        """
        Inherit this method in the localization module
        to generate the INTRASTAT Declaration XML file

        Returns:
        string with XML data

        Call the _check_xml_schema() method
        before returning the XML string.
        """
        return False

    @api.one
    def send_reminder_email(self, mail_template_xmlid):
        mail_template = self.env.ref(mail_template_xmlid)
        if self.company_id.intrastat_remind_user_ids:
            mail_template.send_mail(self.id)
            logger.info(
                'Intrastat Reminder email has been sent (XMLID: %s).'
                % mail_template_xmlid)
        else:
            logger.warning(
                'The list of users receiving the Intrastat Reminder is empty '
                'on company %s' % self.company_id.name)
        return True

    @api.multi
    def unlink(self):
        for intrastat in self:
            if intrastat.state == 'done':
                raise UserError(
                    _('Cannot delete the declaration %s '
                        'because it is in Done state') % self.year_month)
        return super(IntrastatCommon, self).unlink()


class IntrastatResultView(models.TransientModel):
    """
    Transient Model to display Intrastat Report results
    """
    _name = 'intrastat.result.view'

    note = fields.Text(
        string='Notes', readonly=True,
        default=lambda self: self._context.get('note'))