from datetime import date

from odoo.tests.common import TransactionCase
from odoo.tests import tagged
from odoo.exceptions import ValidationError


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

    def setUp(self):
        super().setUp()
        self.asset_vals = {
            'name': 'Test Asset',
            'cost': 10000,
            'salvage_value': 1000,
            'acquisition_date': date(2026, 1, 1),
            'method': 'straight_line',
            'useful_life_years': 5,
        }

    def test_create_minimal(self):
        a = self.env['fusion.asset'].create(self.asset_vals)
        self.assertEqual(a.state, 'draft')
        self.assertEqual(a.book_value, 10000)

    def test_state_transitions_draft_to_running(self):
        a = self.env['fusion.asset'].create(self.asset_vals)
        a.action_set_running()
        self.assertEqual(a.state, 'running')
        self.assertTrue(a.in_service_date)

    def test_pause_resume(self):
        a = self.env['fusion.asset'].create(self.asset_vals)
        a.action_set_running()
        a.action_pause()
        self.assertEqual(a.state, 'paused')
        a.action_resume()
        self.assertEqual(a.state, 'running')

    def test_cannot_pause_from_draft(self):
        a = self.env['fusion.asset'].create(self.asset_vals)
        with self.assertRaises(ValidationError):
            a.action_pause()

    def test_negative_cost_rejected(self):
        with self.assertRaises(Exception):
            self.env['fusion.asset'].create({**self.asset_vals, 'cost': -100})

    def test_salvage_exceeds_cost_rejected(self):
        with self.assertRaises(Exception):
            self.env['fusion.asset'].create(
                {**self.asset_vals, 'cost': 1000, 'salvage_value': 5000},
            )

    def test_book_value_starts_at_cost(self):
        a = self.env['fusion.asset'].create(self.asset_vals)
        self.assertEqual(a.book_value, a.cost)
        self.assertEqual(a.total_depreciated, 0)