from odoo import api, fields, models


class HelpdeskTicket(models.Model):
    _inherit = "helpdesk.ticket"

    date_deadline = fields.Date(
        string="Deadline",
        tracking=True,
        help="Target date by which the ticket should be resolved.",
    )
    deadline_overdue = fields.Boolean(
        string="Overdue",
        compute="_compute_deadline_overdue",
        help="True when the deadline is strictly before today.",
    )

    @api.depends("date_deadline")
    def _compute_deadline_overdue(self):
        """Flag tickets whose deadline is strictly before today.

        A ticket without a deadline is never overdue. The comparison uses
        the current user's timezone so the flag flips at local midnight.
        """
        today = fields.Date.context_today(self)
        for ticket in self:
            ticket.deadline_overdue = bool(
                ticket.date_deadline and ticket.date_deadline < today
            )