# Copyright 2019 Creu Blanca
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).

import base64
import json
import binascii
from flectra import api, fields, models, _
from flectra.exceptions import UserError
import re


class DocumentQuickAccessRule(models.Model):
    _name = 'document.quick.access.rule'
    _description = 'Document Quick Access Rule'
    _order = 'priority,model_id'

    name = fields.Char(required=True)
    priority = fields.Integer(default=16, required=True)
    barcode_format = fields.Selection([
        ('standard', 'Standard'),
        ('b64_standard', 'Base64'),
    ], required=True, default='standard')
    # All formats must have a function to determine the code from a record and
    # get the record from the code
    model_id = fields.Many2one(
        'ir.model',
        required=True,
    )
    active = fields.Boolean(
        default=True,
    )

    def get_code(self, record):
        self.ensure_one()
        return getattr(self, '_get_code_%s' % self.barcode_format)(record)

    def _get_code_b64_standard(self, record):
        return base64.b64encode(
            self._get_code_standard(record).encode('utf-8')).decode('utf-8')

    def _get_code_standard(self, record):
        return '%s,%s' % (record._name, record.id)

    def _check_code_b64_standard(self, code):
        try:
            aux_code = base64.b64decode(code.encode('utf-8'), validate=True)
        except binascii.Error:
            return False
        return self._check_code_standard(aux_code.decode('utf-8'))

    def _check_code_standard(self, code):
        return re.match("^[a-zA-Z0-9\\.]*,[0-9]*$", code)

    def _read_code_b64_standard(self, code):
        aux_code = base64.b64decode(code.encode('utf-8')).decode('utf-8')
        return self._read_code_standard(aux_code)

    def _read_code_standard(self, code):
        params = code.split(',')
        return self.env[params[0]].browse(int(params[1])).exists()

    def read_code_action(self, code):
        try:
            record = self.read_code(code)
        except UserError:
            return {
                'type': 'ir.actions.act_window',
                'name': 'Search QR',
                'res_model':  'barcode.action',
                'views': [[False, 'form']],
                'target': 'new',
                'context': json.dumps({
                    'default_model': 'document.quick.access.rule',
                    'default_method': 'read_code_action',
                    'default_state': 'warning',
                    'default_status': _('Document cannot be found')
                })
            }
        record.check_access_rights('read')
        result = {
            "type": "ir.actions.act_window",
            "res_model": record._name,
            "views": [[record.get_formview_id(), "form"]],
            "res_id": record.id,
            "target": "main",
        }
        return result

    @api.model
    def read_code(self, code):
        formats = self._fields['barcode_format'].selection
        for barcode_format, format_name in formats:
            if getattr(self, '_check_code_%s' % barcode_format)(code):
                record = getattr(self, '_read_code_%s' % barcode_format)(code)
                if record and self.search([
                    ('model_id.model', '=', record._name),
                    ('barcode_format', '=', barcode_format)
                ]):
                    return record
        raise UserError(_('No format has been found for this record'))