# -*- coding: utf-8 -*-
from psycopg2 import IntegrityError

from odoo.tests.common import TransactionCase, tagged
from odoo.tools.misc import mute_logger


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

    def setUp(self):
        super().setUp()
        self.metric = self.env['fusion.billing.metric'].sudo().create(
            {'name': 'API Calls', 'code': 'api_calls', 'aggregation': 'sum'})

    def _charge(self, **kw):
        vals = {
            'name': 'Maps overage', 'plan_code': 'maps-business',
            'metric_id': self.metric.id, 'charge_model': 'standard',
            'included_quota': 5_000_000.0, 'price_per_unit': 0.10, 'unit_batch': 1000.0,
        }
        vals.update(kw)
        return self.env['fusion.billing.charge'].sudo().create(vals)

    def test_under_quota_is_free(self):
        charge = self._charge()
        overage_units, amount = charge._compute_billable(4_000_000.0)
        self.assertEqual(overage_units, 0.0)
        self.assertEqual(amount, 0.0)

    def test_standard_overage_per_1k(self):
        charge = self._charge()
        # 6,000,000 used - 5,000,000 quota = 1,000,000 overage = 1000 batches * $0.10
        overage_units, amount = charge._compute_billable(6_000_000.0)
        self.assertEqual(overage_units, 1_000_000.0)
        self.assertAlmostEqual(amount, 100.0, places=2)

    def test_partial_batch_rounds_up(self):
        charge = self._charge(included_quota=0.0)
        # 1,500 units, batch 1000 -> 2 batches -> $0.20
        _, amount = charge._compute_billable(1_500.0)
        self.assertAlmostEqual(amount, 0.20, places=2)

    def test_package_model_charges_whole_packages(self):
        charge = self._charge(charge_model='package', included_quota=0.0, unit_batch=1000.0, price_per_unit=2.0)
        # 2,001 units -> 3 packages -> $6.00
        _, amount = charge._compute_billable(2_001.0)
        self.assertAlmostEqual(amount, 6.0, places=2)

    # ── item 10 (M7): only the two implemented charge models remain ──
    def test_charge_model_selection_limited(self):
        field = self.env['fusion.billing.charge']._fields['charge_model']
        keys = [k for k, _label in field.selection]
        self.assertEqual(sorted(keys), ['package', 'standard'])
        self.assertNotIn('graduated', keys)
        self.assertNotIn('volume', keys)

    # ── item 11 (L1): currency is required and defaults to company currency ──
    def test_currency_required_and_defaulted(self):
        field = self.env['fusion.billing.charge']._fields['currency_id']
        self.assertTrue(field.required)
        charge = self._charge()
        self.assertEqual(charge.currency_id, self.env.company.currency_id)

    # ── item 12 (L2): non-negative price + positive batch DB constraints ──
    def test_negative_price_rejected(self):
        with self.assertRaises(IntegrityError), mute_logger('odoo.sql_db'):
            with self.env.cr.savepoint():
                self._charge(price_per_unit=-1.0)

    def test_zero_batch_rejected(self):
        with self.assertRaises(IntegrityError), mute_logger('odoo.sql_db'):
            with self.env.cr.savepoint():
                self._charge(unit_batch=0.0)