from odoo import api, fields, models


class HRCandidate(models.Model):
    _inherit = 'hr.candidate'

    current_offer_letter_id = fields.Many2one(
        'offer.letter',
        string='Current Offer Letter',
        compute='_compute_current_offer_letter',
        store=False,
    )
    offer_release_status = fields.Selection(
        selection=[
            ('requested', 'Requested'),
            ('sent', 'Sent to Applicant'),
            ('accepted', 'Accepted'),
            ('rejected', 'Rejected'),
            ('expired', 'Expired'),
        ],
        string='Offer Status',
        related='current_offer_letter_id.state',
        readonly=True,
        store=False,
    )

    @api.depends('applicant_ids.current_offer_letter_id', 'applicant_ids.current_offer_letter_id.create_date')
    def _compute_current_offer_letter(self):
        for candidate in self:
            offer_letters = candidate.applicant_ids.mapped('current_offer_letter_id').sorted(
                key=lambda offer: (offer.create_date or fields.Datetime.from_string('1970-01-01 00:00:00'), offer.id)
            )
            candidate.current_offer_letter_id = offer_letters[-1] if offer_letters else False