from decimal import Decimal

from django.conf import settings
from django.test import TestCase
from rest_framework.test import APIClient

from apps.accounts.models import Team, TeamMember, User
from apps.billing.models import CreditAccount, CreditLedger


class AuthApiTests(TestCase):
    def test_register_creates_user_team_member_credit_account_and_token(self):
        client = APIClient()
        response = client.post(
            "/api/auth/register/",
            {
                "username": "new-owner",
                "password": "strong-password",
                "email": "owner@example.com",
                "team_name": "Launch Team",
            },
            format="json",
        )

        self.assertEqual(response.status_code, 201)
        self.assertIn("token", response.data)
        user = User.objects.get(username="new-owner")
        team = Team.objects.get(name="Launch Team")
        self.assertEqual(team.owner, user)
        self.assertTrue(TeamMember.objects.filter(team=team, user=user, role=TeamMember.Role.OWNER).exists())
        self.assertTrue(CreditAccount.objects.filter(team=team).exists())

    def test_register_trial_grant_is_recorded_in_ledger(self):
        """开户赠送额度必须进流水:余额=赠送额,且有一条 balance_after=赠送额的 genesis 流水,账目从第一条起可对账。"""
        client = APIClient()
        client.post(
            "/api/auth/register/",
            {"username": "ledger-owner", "password": "strong-password", "team_name": "Ledger Team"},
            format="json",
        )
        team = Team.objects.get(name="Ledger Team")
        trial = Decimal(str(settings.DEFAULT_TRIAL_CREDITS))
        account = CreditAccount.objects.get(team=team)
        self.assertEqual(account.balance, trial)
        genesis = CreditLedger.objects.filter(team=team, ledger_type=CreditLedger.Type.RECHARGE)
        self.assertEqual(genesis.count(), 1)
        self.assertEqual(genesis.first().amount, trial)
        self.assertEqual(genesis.first().balance_after, trial)  # 流水终点 == 账户余额,可对账