from decimal import Decimal
from django.test import TestCase
from django.contrib.auth import get_user_model
from rest_framework.test import APIClient
from rest_framework import status

from apps.profiles.models import Institution
from apps.donations.models import DonationCampaign, DonationTransaction, CampaignCategory, CampaignPriority, PaymentStatus

User = get_user_model()


class Phase9DonationsAPITests(TestCase):
    """
    Automated test suite for Phase 9: Donations & Financial Campaigns
    - Campaign Listing & Filtering
    - Campaign Detail & Progress Calculation
    - Charitable Contribution Flow & Automatic Balance Increment
    """

    def setUp(self):
        self.client = APIClient()

        self.donor = User.objects.create_user(
            email="donor@charitynet.org",
            password="Password123!",
            fullname="Haj Ahmad Karimi",
        )
        self.institution = Institution.objects.create(
            name="Imam Reza Humanitarian Center",
            country="Afghanistan",
            city="Herat",
            type=Institution.InstitutionType.CHARITY,
        )
        self.campaign = DonationCampaign.objects.create(
            title="Clean Water Wells & Winter Food Baskets for Displaced Families",
            description="Emergency humanitarian appeal to construct 15 solar-powered clean water wells.",
            target_amount=Decimal('50000.00'),
            raised_amount=Decimal('12500.00'),
            currency='USD',
            category=CampaignCategory.HUMANITARIAN_RELIEF,
            priority=CampaignPriority.URGENT,
            institution=self.institution,
            organization_name="Astan Relief Foundation",
            is_active=True,
            is_featured=True,
        )

    def test_campaign_listing_and_filtering(self):
        # 1. List
        response = self.client.get("/api/v1/donations/campaigns/")
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        self.assertEqual(len(response.data), 1)
        self.assertEqual(response.data[0]["title"], self.campaign.title)
        self.assertEqual(response.data[0]["progress_percentage"], 25)

        # 2. Filter by category
        res_cat = self.client.get(f"/api/v1/donations/campaigns/?category={CampaignCategory.HUMANITARIAN_RELIEF}")
        self.assertEqual(res_cat.status_code, status.HTTP_200_OK)
        self.assertEqual(len(res_cat.data), 1)

    def test_campaign_detail_view(self):
        response = self.client.get(f"/api/v1/donations/campaigns/{self.campaign.slug}/")
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        self.assertEqual(response.data["id"], self.campaign.id)
        self.assertEqual(response.data["target_amount"], "50000.00")
        self.assertEqual(response.data["progress_percentage"], 25)

    def test_donation_contribution_flow(self):
        self.client.force_authenticate(user=self.donor)

        payload = {
            "amount": 2500.00,
            "donor_name": "Haj Ahmad Karimi",
        }
        response = self.client.post(f"/api/v1/donations/campaigns/{self.campaign.slug}/contribute/", payload, format="json")
        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
        self.assertTrue(response.data["transaction_reference"].startswith("DON-RAZAVI-"))
        self.assertEqual(response.data["amount"], "2500.00")
        self.assertEqual(response.data["payment_status"], PaymentStatus.COMPLETED)

        # Check campaign raised amount incremented: 12500 + 2500 = 15000
        self.campaign.refresh_from_db()
        self.assertEqual(self.campaign.raised_amount, Decimal('15000.00'))
        self.assertEqual(self.campaign.progress_percentage, 30)
        self.assertEqual(self.campaign.donors_count, 1)