# -*- coding: utf-8 -*-
# Copyright 2026 Nexa Systems Inc.
# License OPL-1 (Odoo Proprietary License v1.0)
# Part of the Fusion Plating product family.

from odoo import api, fields, models


class FpChainOfCustody(models.Model):
    """A single custody event — the audit trail for parts in transit.

    A chain of custody record is created every time parts change hands:
    received from the customer, loaded on a vehicle, entered a facility,
    transferred between facilities, or delivered to the customer.

    These records are append-only in practice and form the evidence
    trail that quality and compliance audits rely on. They are linked
    to either a pickup request or a delivery (or both, for a full
    round-trip).
    """
    _name = 'fusion.plating.chain.of.custody'
    _description = 'Fusion Plating — Chain of Custody Event'
    _order = 'event_datetime desc, id desc'
    _rec_name = 'display_name'

    name = fields.Char(
        string='Reference',
    )
    display_name = fields.Char(
        compute='_compute_display_name',
        store=True,
    )
    event_datetime = fields.Datetime(
        string='Event Time',
        required=True,
        default=fields.Datetime.now,
    )
    event_type = fields.Selection(
        [
            ('received_from_customer', 'Received from Customer'),
            ('entered_facility', 'Entered Facility'),
            ('exited_facility', 'Exited Facility'),
            ('loaded_on_vehicle', 'Loaded on Vehicle'),
            ('delivered_to_customer', 'Delivered to Customer'),
            ('transferred_between_facilities', 'Transferred Between Facilities'),
        ],
        string='Event Type',
        required=True,
    )
    from_party = fields.Char(
        string='From',
    )
    to_party = fields.Char(
        string='To',
    )
    pickup_request_id = fields.Many2one(
        'fusion.plating.pickup.request',
        string='Pickup Request',
        ondelete='set null',
    )
    delivery_id = fields.Many2one(
        'fusion.plating.delivery',
        string='Delivery',
        ondelete='set null',
    )
    facility_id = fields.Many2one(
        'fusion.plating.facility',
        string='Facility',
    )
    company_id = fields.Many2one(
        'res.company',
        related='facility_id.company_id',
        store=True,
        readonly=True,
    )
    recorded_by_id = fields.Many2one(
        'res.users',
        string='Recorded By',
        default=lambda self: self.env.user,
    )
    notes = fields.Text(
        string='Notes',
    )

    @api.depends('event_type', 'event_datetime', 'from_party', 'to_party')
    def _compute_display_name(self):
        selection = dict(self._fields['event_type']._description_selection(self.env))
        for rec in self:
            label = selection.get(rec.event_type, rec.event_type or '')
            when = fields.Datetime.to_string(rec.event_datetime) if rec.event_datetime else ''
            rec.display_name = f'{label} @ {when}' if when else label