from odoo.tests.common import TransactionCase
from odoo.tests import tagged
from odoo.addons.fusion_accounting_assets.services.salvage_value import (
    SalvageConfig, compute_salvage_value, remaining_useful_life_value,
)


@tagged('post_install', '-at_install')
class TestSalvageValue(TransactionCase):

    def test_zero_method_returns_zero(self):
        v = compute_salvage_value(cost=10000, config=SalvageConfig(method='zero'))
        self.assertEqual(v, 0.0)

    def test_percentage_method(self):
        v = compute_salvage_value(
            cost=10000, config=SalvageConfig(method='percentage', value=10),
        )
        self.assertAlmostEqual(v, 1000.0, places=2)

    def test_fixed_method(self):
        v = compute_salvage_value(
            cost=10000, config=SalvageConfig(method='fixed', value=750),
        )
        self.assertAlmostEqual(v, 750.0, places=2)

    def test_unknown_method_raises(self):
        with self.assertRaises(ValueError):
            compute_salvage_value(
                cost=10000,
                config=SalvageConfig(method='bogus', value=0),  # type: ignore[arg-type]
            )

    def test_remaining_useful_life_value_midway(self):
        # Halfway through life; current book 6000, salvage 1000 -> 1000 + 5000*0.5 = 3500
        v = remaining_useful_life_value(
            current_book=6000, salvage=1000, periods_used=5, total_periods=10,
        )
        self.assertAlmostEqual(v, 3500.0, places=2)

    def test_remaining_useful_life_value_at_end_returns_salvage(self):
        v = remaining_useful_life_value(
            current_book=1200, salvage=1000, periods_used=10, total_periods=10,
        )
        self.assertEqual(v, 1000.0)