"""
Integration test for subscription management.
This test MUST fail before implementation.
"""

import pytest
from django.test import TestCase
from django.urls import reverse
from rest_framework.test import APIClient
from rest_framework import status
import json
from datetime import datetime, timedelta


class SubscriptionManagementIntegrationTest(TestCase):
    def setUp(self):
        self.client = APIClient()

        # Admin authentication header
        self.admin_auth = {'HTTP_AUTHORIZATION': 'Bearer super_admin_token'}

        # Tenant admin authentication header
        self.tenant_admin_auth = {'HTTP_AUTHORIZATION': 'Bearer tenant_admin_token'}

        # Test subscription data
        self.subscription_data = {
            'plan': 'GROWTH',
            'pricing_model': 'SUBSCRIPTION',
            'billing_cycle': 'MONTHLY',
            'payment_method': {
                'type': 'CARD',
                'card_last4': '4242',
                'expiry_month': 12,
                'expiry_year': 2025,
                'brand': 'visa'
            },
            'modules': ['retail', 'inventory'],
            'trial_days': 14
        }

    def test_subscription_lifecycle_management(self):
        """Test complete subscription lifecycle from trial to cancellation."""
        # Step 1: Create subscription with trial (should fail before implementation)
        create_response = self.client.post(
            '/api/v1/subscriptions/',
            data=json.dumps(self.subscription_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert create_response.status_code == status.HTTP_201_CREATED
        subscription_data = create_response.json()

        # Verify subscription structure
        assert 'id' in subscription_data
        assert subscription_data['plan'] == self.subscription_data['plan']
        assert subscription_data['status'] == 'TRIAL'
        assert subscription_data['billing_cycle'] == self.subscription_data['billing_cycle']

        # Verify billing period
        assert 'current_period_start' in subscription_data
        assert 'current_period_end' in subscription_data
        assert 'trial_end' in subscription_data

        # Step 2: Test subscription upgrades during trial
        upgrade_data = {
            'plan': 'PRO',
            'reason': 'Business growth requires more features'
        }

        upgrade_response = self.client.post(
            f'/api/v1/subscriptions/{subscription_data["id"]}/upgrade/',
            data=json.dumps(upgrade_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert upgrade_response.status_code == status.HTTP_200_OK
        upgraded_data = upgrade_response.json()

        assert upgraded_data['plan'] == 'PRO'
        assert upgraded_data['status'] == 'TRIAL'  # Still in trial period

        # Step 3: Simulate trial end and activation
        # In real implementation, this would be handled by a background job
        activate_response = self.client.post(
            f'/api/v1/subscriptions/{subscription_data["id"]}/activate/',
            data=json.dumps({}),
            content_type='application/json',
            **self.admin_auth
        )

        assert activate_response.status_code == status.HTTP_200_OK
        activated_data = activate_response.json()

        assert activated_data['status'] == 'ACTIVE'
        assert activated_data['plan'] == 'PRO'

        # Step 4: Test subscription usage tracking
        usage_response = self.client.get(
            f'/api/v1/subscriptions/{subscription_data["id"]}/usage/',
            **self.tenant_admin_auth
        )

        assert usage_response.status_code == status.HTTP_200_OK
        usage_data = usage_response.json()

        assert 'usage' in usage_data
        assert 'limits' in usage_data
        assert 'users_count' in usage_data['usage']
        assert 'storage_used' in usage_data['usage']

        # Step 5: Test subscription downgrade
        downgrade_data = {
            'plan': 'GROWTH',
            'effective_date': (datetime.now() + timedelta(days=30)).isoformat()
        }

        downgrade_response = self.client.post(
            f'/api/v1/subscriptions/{subscription_data["id"]}/downgrade/',
            data=json.dumps(downgrade_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert downgrade_response.status_code == status.HTTP_200_OK
        downgraded_data = downgrade_response.json()

        assert downgraded_data['pending_plan'] == 'GROWTH'
        assert downgraded_data['plan_change_effective_date'] == downgrade_data['effective_date']

        # Step 6: Test subscription cancellation
        cancel_data = {
            'reason': 'Business closure',
            'feedback': 'Closing down operations',
            'immediate': False
        }

        cancel_response = self.client.post(
            f'/api/v1/subscriptions/{subscription_data["id"]}/cancel/',
            data=json.dumps(cancel_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert cancel_response.status_code == status.HTTP_200_OK
        cancelled_data = cancel_response.json()

        assert cancelled_data['status'] == 'ACTIVE'  # Still active until end of period
        assert cancelled_data['cancel_at_period_end'] is True

    def test_subscription_billing_and_payments(self):
        """Test subscription billing and payment processing."""
        # Create subscription
        create_response = self.client.post(
            '/api/v1/subscriptions/',
            data=json.dumps(self.subscription_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert create_response.status_code == status.HTTP_201_CREATED
        subscription_id = create_response.json()['id']

        # Test billing history
        billing_response = self.client.get(
            f'/api/v1/subscriptions/{subscription_id}/billing/',
            **self.tenant_admin_auth
        )

        assert billing_response.status_code == status.HTTP_200_OK
        billing_data = billing_response.json()

        assert 'invoices' in billing_data
        assert 'payments' in billing_data
        assert 'upcoming_invoice' in billing_data

        # Test payment method management
        payment_method_data = {
            'type': 'CARD',
            'card_number': '4242424242424242',
            'expiry_month': 12,
            'expiry_year': 2025,
            'cvv': '123',
            'cardholder_name': 'Test User'
        }

        add_payment_response = self.client.post(
            f'/api/v1/subscriptions/{subscription_id}/payment-methods/',
            data=json.dumps(payment_method_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert add_payment_response.status_code == status.HTTP_201_CREATED

    def test_subscription_plan_changes_validation(self):
        """Test validation of subscription plan changes."""
        # Create subscription
        create_response = self.client.post(
            '/api/v1/subscriptions/',
            data=json.dumps(self.subscription_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert create_response.status_code == status.HTTP_201_CREATED
        subscription_id = create_response.json()['id']

        # Test invalid plan upgrade
        invalid_upgrade_data = {
            'plan': 'INVALID_PLAN'
        }

        invalid_upgrade_response = self.client.post(
            f'/api/v1/subscriptions/{subscription_id}/upgrade/',
            data=json.dumps(invalid_upgrade_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert invalid_upgrade_response.status_code == status.HTTP_400_BAD_REQUEST

        # Test downgrade to same plan
        same_plan_data = {
            'plan': self.subscription_data['plan']
        }

        same_plan_response = self.client.post(
            f'/api/v1/subscriptions/{subscription_id}/downgrade/',
            data=json.dumps(same_plan_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert same_plan_response.status_code == status.HTTP_400_BAD_REQUEST

    def test_subscription_module_management(self):
        """Test subscription module add-ons and management."""
        # Create base subscription
        base_subscription = self.subscription_data.copy()
        base_subscription['modules'] = ['retail']

        create_response = self.client.post(
            '/api/v1/subscriptions/',
            data=json.dumps(base_subscription),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert create_response.status_code == status.HTTP_201_CREATED
        subscription_id = create_response.json()['id']

        # Add module
        add_module_data = {
            'module': 'inventory',
            'pricing_model': 'PER_MODULE',
            'billing_cycle': 'MONTHLY'
        }

        add_module_response = self.client.post(
            f'/api/v1/subscriptions/{subscription_id}/modules/',
            data=json.dumps(add_module_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert add_module_response.status_code == status.HTTP_200_OK

        # Remove module
        remove_module_response = self.client.delete(
            f'/api/v1/subscriptions/{subscription_id}/modules/inventory/',
            **self.tenant_admin_auth
        )

        assert remove_module_response.status_code == status.HTTP_200_OK

    def test_subscription_usage_limits(self):
        """Test subscription usage limits and overage handling."""
        # Create subscription with specific limits
        limited_subscription = self.subscription_data.copy()
        limited_subscription['usage_limits'] = {
            'users': 5,
            'storage_gb': 10,
            'api_calls_per_month': 10000
        }

        create_response = self.client.post(
            '/api/v1/subscriptions/',
            data=json.dumps(limited_subscription),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert create_response.status_code == status.HTTP_201_CREATED
        subscription_id = create_response.json()['id']

        # Check usage limits
        limits_response = self.client.get(
            f'/api/v1/subscriptions/{subscription_id}/limits/',
            **self.tenant_admin_auth
        )

        assert limits_response.status_code == status.HTTP_200_OK
        limits_data = limits_response.json()

        assert 'limits' in limits_data
        assert 'current_usage' in limits_data
        assert 'overage_charges' in limits_data

    def test_subscription_discounts_and_promotions(self):
        """Test subscription discounts and promotional codes."""
        # Create subscription with promo code
        promo_subscription = self.subscription_data.copy()
        promo_subscription['promo_code'] = 'WELCOME20'

        create_response = self.client.post(
            '/api/v1/subscriptions/',
            data=json.dumps(promo_subscription),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert create_response.status_code == status.HTTP_201_CREATED
        subscription_data = create_response.json()

        # Check discount was applied
        assert 'discount' in subscription_data
        assert subscription_data['promo_code'] == 'WELCOME20'

    def test_subscription_notifications_and_reminders(self):
        """Test subscription notifications and renewal reminders."""
        # Create subscription
        create_response = self.client.post(
            '/api/v1/subscriptions/',
            data=json.dumps(self.subscription_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert create_response.status_code == status.HTTP_201_CREATED
        subscription_id = create_response.json()['id']

        # Test notification settings
        notification_settings = {
            'email_notifications': True,
            'renewal_reminders': True,
            'usage_alerts': True,
            'billing_notifications': True
        }

        settings_response = self.client.put(
            f'/api/v1/subscriptions/{subscription_id}/notifications/',
            data=json.dumps(notification_settings),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert settings_response.status_code == status.HTTP_200_OK

    def test_subscription_audit_trail(self):
        """Test subscription changes audit trail."""
        # Create subscription
        create_response = self.client.post(
            '/api/v1/subscriptions/',
            data=json.dumps(self.subscription_data),
            content_type='application/json',
            **self.tenant_admin_auth
        )

        assert create_response.status_code == status.HTTP_201_CREATED
        subscription_id = create_response.json()['id']

        # Get audit trail
        audit_response = self.client.get(
            f'/api/v1/subscriptions/{subscription_id}/audit/',
            **self.admin_auth
        )

        assert audit_response.status_code == status.HTTP_200_OK
        audit_data = audit_response.json()

        assert 'changes' in audit_data
        assert isinstance(audit_data['changes'], list)
        assert len(audit_data['changes']) > 0

        # First change should be subscription creation
        first_change = audit_data['changes'][0]
        assert first_change['action'] == 'CREATE'
        assert first_change['user_id'] is not None