from datetime import date, timedelta
from odoo.tests.common import TransactionCase
from odoo.tests import tagged
from odoo.addons.fusion_accounting_followup.services.level_resolver import (
    FollowupLevelSpec, resolve_level,
)
from odoo.addons.fusion_accounting_followup.services.overdue_aging import compute_aging


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

    def setUp(self):
        super().setUp()
        self.levels = [
            FollowupLevelSpec(sequence=1, name='Reminder', delay_days=7, tone='gentle'),
            FollowupLevelSpec(sequence=2, name='Warning', delay_days=30, tone='firm'),
            FollowupLevelSpec(sequence=3, name='Legal Notice', delay_days=60, tone='legal'),
        ]

    def test_no_overdue_returns_none(self):
        as_of = date(2026, 4, 19)
        lines = [{'date_maturity': as_of + timedelta(days=10), 'amount_residual': 100}]
        report = compute_aging(move_lines=lines, as_of=as_of)
        result = resolve_level(aging_report=report, levels=self.levels)
        self.assertIsNone(result)

    def test_15_days_overdue_picks_reminder(self):
        as_of = date(2026, 4, 19)
        lines = [{'date_maturity': as_of - timedelta(days=15), 'amount_residual': 100}]
        report = compute_aging(move_lines=lines, as_of=as_of)
        result = resolve_level(aging_report=report, levels=self.levels)
        self.assertEqual(result.name, 'Reminder')

    def test_45_days_overdue_picks_warning(self):
        as_of = date(2026, 4, 19)
        lines = [{'date_maturity': as_of - timedelta(days=45), 'amount_residual': 200}]
        report = compute_aging(move_lines=lines, as_of=as_of)
        result = resolve_level(aging_report=report, levels=self.levels)
        self.assertEqual(result.name, 'Warning')

    def test_75_days_overdue_picks_legal(self):
        as_of = date(2026, 4, 19)
        lines = [{'date_maturity': as_of - timedelta(days=75), 'amount_residual': 300}]
        report = compute_aging(move_lines=lines, as_of=as_of)
        result = resolve_level(aging_report=report, levels=self.levels)
        self.assertEqual(result.name, 'Legal Notice')

    def test_no_levels_returns_none(self):
        as_of = date(2026, 4, 19)
        lines = [{'date_maturity': as_of - timedelta(days=30), 'amount_residual': 100}]
        report = compute_aging(move_lines=lines, as_of=as_of)
        result = resolve_level(aging_report=report, levels=[])
        self.assertIsNone(result)

    def test_invalid_tone_raises(self):
        with self.assertRaises(ValueError):
            FollowupLevelSpec(sequence=1, name='X', delay_days=7, tone='invalid')