"""Partial sale wizard (sell a portion of an asset).

Splits the asset into a child (the sold portion) and disposes the child;
parent retains remaining cost + salvage."""

from odoo import _, api, fields, models
from odoo.exceptions import UserError


class FusionPartialSaleWizard(models.TransientModel):
    _name = "fusion.partial.sale.wizard"
    _description = "Asset Partial Sale Wizard"

    asset_id = fields.Many2one(
        'fusion.asset', required=True,
        default=lambda self: self._default_asset(),
    )
    company_id = fields.Many2one(related='asset_id.company_id')
    currency_id = fields.Many2one(related='asset_id.currency_id')
    cost = fields.Monetary(related='asset_id.cost', readonly=True)
    book_value = fields.Monetary(related='asset_id.book_value', readonly=True)

    sold_pct = fields.Float(
        string='% of cost being sold', default=30.0,
        help="Percentage of original cost attributed to the sold portion.",
    )
    sold_amount = fields.Monetary(string='Sale Amount', required=True)
    sale_date = fields.Date(required=True, default=fields.Date.today)
    sale_partner_id = fields.Many2one('res.partner')

    estimated_sold_cost = fields.Monetary(compute='_compute_sold_cost')
    estimated_gain_loss = fields.Monetary(compute='_compute_sold_cost')

    @api.model
    def _default_asset(self):
        ctx = self.env.context
        if ctx.get('active_model') == 'fusion.asset':
            return ctx.get('active_id')
        return False

    @api.depends('sold_pct', 'sold_amount', 'cost')
    def _compute_sold_cost(self):
        for w in self:
            w.estimated_sold_cost = round(w.cost * (w.sold_pct or 0) / 100, 2)
            w.estimated_gain_loss = w.sold_amount - w.estimated_sold_cost

    def action_partial_sell(self):
        self.ensure_one()
        if not (0 < self.sold_pct < 100):
            raise UserError(_("sold_pct must be strictly between 0 and 100."))
        if self.asset_id.state == 'disposed':
            raise UserError(_("Asset already disposed."))

        result = self.env['fusion.asset.engine'].partial_sale(
            self.asset_id,
            sold_amount=self.sold_amount,
            sold_qty=self.sold_pct / 100,
            sale_date=self.sale_date,
            sale_partner=self.sale_partner_id,
        )
        return {
            'type': 'ir.actions.act_window',
            'res_model': 'fusion.asset',
            'res_id': result['parent_asset_id'],
            'view_mode': 'form',
            'target': 'current',
        }