class QualityTask(ModelSQL, ModelView, Workflow):
    "Quality Task"
    __name__ = 'quality.task'

    company = fields.Many2One(
        'company.company', "Company", required=True, readonly=True,
        ondelete='CASCADE')
    quality_task_dictionary = fields.Many2One(
        'quality.task.dictionary', "Quality Task Dictionary",
        required=True, readonly=True)
    product = fields.Many2One('product.product', "Product", readonly=True)
    origin = fields.Reference(
        "Origin", selection='get_origin', select=True,
        required=True, readonly=True)
    customer = fields.Function(fields.Many2One(
            'party.party', "Customer",
            context={
                'company': Eval('company', -1),
                },
            depends={'company'}),
        'get_customer', searcher='search_customer')
    task_name = fields.Function(fields.Char("Name"), 'get_task_name')
    task_description = fields.Function(
        fields.Text("Description"), 'get_task_description')
    task_type = fields.Selection([
        ('administrative', "Administrative"),
        ('quality', "Quality")
    ], "Type of the task", select=True, readonly=True, required=True)
    planned_date = fields.Date(
        "Planned Date", select=True, readonly=True, required=True)
    note = fields.Text(
        "Note",
        states={
            'readonly': Eval('state') != 'requested',
        })
    bypassed_by = employee_field("Bypassed by")
    done_by = employee_field("Done by")
    cancelled_by = employee_field("Cancelled by")
    state = fields.Selection([
        ('requested', "Requested"),
        ('done', "Done"),
        ('bypassed', "Bypassed"),
        ('cancelled', "Cancelled"),
    ], "State", readonly=True, required=True)

    @classmethod
    def __setup__(cls):
        super(QualityTask, cls).__setup__()
        cls._order = [
            ('planned_date', 'DESC'),
        ]
        cls._transitions = set((
            ('requested', 'cancelled'),
            ('cancelled', 'requested'),
            ('requested', 'bypassed'),
            ('bypassed', 'requested'),
            ('requested', 'done'),
        ))
        cls._buttons.update({
            'request': {
                'invisible': ~Eval('state').in_(['cancelled', 'bypassed']),
                'depends': ['state'],
            },
            'cancel': {
                'invisible': Eval('state') != 'requested',
                'depends': ['state'],
            },
            'done': {
                'invisible': Eval('state') != 'requested',
                'depends': ['state'],
            },
        })

    def __eq__(self, other):
        return (self.origin == other.origin
            and self.quality_task_dictionary == other.quality_task_dictionary
            and self.product == other.product)

    def __hash__(self):
        return hash((self.origin,
                    self.quality_task_dictionary,
                    self.product))