# -*- coding: utf-8 -*-
# Copyright 2026 Nexa Systems Inc.
# License OPL-1
"""Per-user read-tracking for the embedded ticket inbox.

Stores ONLY metadata — which central ticket a user has seen and up to
which message id. No ticket content is replicated locally; this exists
purely so the systray unread badge can work without re-fetching the
whole inbox on every page load. Tickets themselves remain a live RPC
view of the central Odoo.
"""
from odoo import api, fields, models


class FusionHelpdeskTicketSeen(models.Model):
    _name = 'fusion.helpdesk.ticket.seen'
    _description = 'Fusion Helpdesk — per-user read tracking (metadata only)'

    user_id = fields.Many2one(
        'res.users', required=True, index=True, ondelete='cascade',
        default=lambda self: self.env.uid,
    )
    central_ticket_id = fields.Integer(
        string='Central Ticket ID', required=True, index=True,
        help='helpdesk.ticket id on the central Odoo.',
    )
    last_seen_message_id = fields.Integer(
        string='Last Seen Message ID', default=0,
        help='Highest central mail.message id this user has viewed for '
             'the ticket. Drives the unread badge.',
    )

    _user_ticket_uniq = models.Constraint(
        'UNIQUE(user_id, central_ticket_id)',
        'One seen-row per user per ticket.',
    )

    @api.model
    def _mark_seen(self, central_ticket_id, last_message_id):
        """Upsert the current user's last-seen marker for a ticket.

        Monotonic — never moves the marker backwards (a stale client
        reporting an older id can't resurrect an unread badge)."""
        rec = self.search([
            ('user_id', '=', self.env.uid),
            ('central_ticket_id', '=', central_ticket_id),
        ], limit=1)
        if rec:
            if (last_message_id or 0) > rec.last_seen_message_id:
                rec.last_seen_message_id = last_message_id
        else:
            self.create({
                'central_ticket_id': central_ticket_id,
                'last_seen_message_id': last_message_id or 0,
            })
        return True

    @api.model
    def _seen_map(self, central_ticket_ids):
        """Return {central_ticket_id: last_seen_message_id} for the
        current user across the given ticket ids."""
        rows = self.search([
            ('user_id', '=', self.env.uid),
            ('central_ticket_id', 'in', list(central_ticket_ids)),
        ])
        return {r.central_ticket_id: r.last_seen_message_id for r in rows}