# Part of Odoo. See LICENSE file for full copyright and licensing details.

import base64
import contextlib
import io
import zipfile

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


class L10nHuEdiTaxAuditExport(models.TransientModel):
    _name = 'l10n_hu_edi.tax_audit_export'
    _description = 'Tax audit export - Adóhatósági Ellenőrzési Adatszolgáltatás'

    selection_mode = fields.Selection(
        string='Selection mode',
        selection=[
            ('date', 'By date'),
            ('name', 'By serial number'),
        ],
        default='date',
    )
    date_from = fields.Date(
        string='Date From'
    )
    date_to = fields.Date(
        string='Date To'
    )
    name_from = fields.Char(
        string='Name From'
    )
    name_to = fields.Char(
        string='Name To'
    )
    filename = fields.Char(
        string='File name',
        compute='_compute_filename'
    )
    export_file = fields.Binary(
        string='Generated File',
        readonly=True
    )

    @api.depends('selection_mode', 'date_from', 'date_to', 'name_from', 'name_to')
    def _compute_filename(self):
        domain = [
            ('move_type', 'in', ('out_invoice', 'out_refund')),
            ('state', '=', 'posted'),
            ('country_code', '=', 'HU'),
        ]
        if self.selection_mode == 'date':
            date_from = self.date_from
            if not date_from:
                first_invoice = self.env['account.move'].search(domain, order='date', limit=1)
                date_from = first_invoice.date
            date_to = self.date_to or fields.Date.today()
            self.filename = f'export_{date_from}_{date_to}.zip'

        else:
            name_from = self.name_from
            if not name_from:
                first_invoice = self.env['account.move'].search(domain, order='name', limit=1)
                name_from = first_invoice.name
            name_to = self.name_to
            if not name_to:
                last_invoice = self.env['account.move'].search(domain, order='name desc', limit=1)
                name_to = last_invoice.name
            self.filename = f'export_{name_from.replace("/", "")}_{name_to.replace("/", "")}.zip'

    def action_export(self):
        self.ensure_one()
        domain = [
            ('move_type', 'in', ('out_invoice', 'out_refund')),
            ('state', '=', 'posted'),
            ('country_code', '=', 'HU'),
        ]
        if self.selection_mode == 'date':
            if self.date_from:
                domain.append(('date', '>=', self.date_from))
            if self.date_to:
                domain.append(('date', '<=', self.date_to))
        else:
            if self.name_from:
                domain.append(('name', '>=', self.name_from))
            if self.name_to:
                domain.append(('name', '<=', self.name_to))

        invoices = self.env['account.move'].search(domain)
        if not invoices:
            raise UserError(_('No invoice to export!'))

        with io.BytesIO() as buf:
            with zipfile.ZipFile(buf, mode='w', compression=zipfile.ZIP_DEFLATED, allowZip64=False) as zf:
                # To correctly generate the XML for invoices created before l10n_hu_edi was installed,
                # we need to temporarily set the chain index and line numbers, so we do this in a savepoint.
                with contextlib.closing(self.env.cr.savepoint(flush=False)):
                    for invoice in invoices.sorted(lambda i: i.create_date):
                        if invoice.l10n_hu_edi_state:
                            # Case 1: An XML was already generated for this invoice.
                            invoice_xml = base64.b64decode(invoice.l10n_hu_edi_attachment)
                        else:
                            # Case 2: No XML was generated for this invoice.
                            if not invoice.l10n_hu_invoice_chain_index:
                                invoice._l10n_hu_edi_set_chain_index()
                            invoice_xml = invoice._l10n_hu_edi_generate_xml()

                        filename = f'{invoice.name.replace("/", "_")}.xml'
                        zf.writestr(filename, invoice_xml)
            self.export_file = base64.b64encode(buf.getvalue())

        return {
            'type': 'ir.actions.act_window',
            'res_model': self._name,
            'view_mode': 'form',
            'res_id': self.id,
            'views': [(False, 'form')],
            'target': 'new',
        }