#!/usr/bin/env python
"""
Test email tracking functionality
Run from backend directory with venv activated:
  cd backend
  source venv/bin/activate  # or venv\Scripts\activate on Windows
  python test_tracking.py
"""

import sys
import os
from datetime import datetime
from pymongo import MongoClient

# Add backend directory to path
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))

from config import Config
from services.tracking_service import generate_tracking_id, create_newsletter_tracking
from database import newsletter_sends_collection, link_clicks_collection
from app import app

print("\n" + "="*80)
print("Email Tracking System Tests")
print("="*80)

# Test counters
tests_passed = 0
tests_failed = 0

def test_result(test_name, passed, message=""):
    """Print test result"""
    global tests_passed, tests_failed
    if passed:
        tests_passed += 1
        print(f"✓ {test_name}")
        if message:
            print(f"  {message}")
    else:
        tests_failed += 1
        print(f"❌ {test_name}")
        if message:
            print(f"  {message}")


# Test 1: Tracking ID Generation
print("\n" + "-"*80)
print("Test 1: Tracking ID Generation")
print("-"*80)

try:
    tracking_id = generate_tracking_id()
    
    # Check format (UUID4)
    is_valid_uuid = len(tracking_id) == 36 and tracking_id.count('-') == 4
    test_result("Generate tracking ID", is_valid_uuid, f"Generated ID: {tracking_id}")
    
    # Check uniqueness
    tracking_id2 = generate_tracking_id()
    is_unique = tracking_id != tracking_id2
    test_result("Tracking IDs are unique", is_unique, f"ID1: {tracking_id[:8]}... ID2: {tracking_id2[:8]}...")
    
except Exception as e:
    test_result("Generate tracking ID", False, f"Error: {str(e)}")


# Test 2: Create Newsletter Tracking
print("\n" + "-"*80)
print("Test 2: Create Newsletter Tracking")
print("-"*80)

try:
    # Clean up test data first
    newsletter_sends_collection.delete_many({'newsletter_id': 'test-newsletter-001'})
    link_clicks_collection.delete_many({'newsletter_id': 'test-newsletter-001'})
    
    # Create tracking with article links
    article_links = [
        {'url': 'https://example.com/article1', 'title': 'Test Article 1'},
        {'url': 'https://example.com/article2', 'title': 'Test Article 2'}
    ]
    
    tracking_data = create_newsletter_tracking(
        newsletter_id='test-newsletter-001',
        subscriber_email='test@example.com',
        article_links=article_links
    )
    
    # Verify return data structure
    has_pixel_id = 'pixel_tracking_id' in tracking_data
    test_result("Returns pixel tracking ID", has_pixel_id)
    
    has_link_map = 'link_tracking_map' in tracking_data
    test_result("Returns link tracking map", has_link_map)
    
    correct_link_count = len(tracking_data.get('link_tracking_map', {})) == 2
    test_result("Creates tracking for all links", correct_link_count, 
                f"Created {len(tracking_data.get('link_tracking_map', {}))} link tracking records")
    
    # Verify database records
    newsletter_record = newsletter_sends_collection.find_one({
        'tracking_id': tracking_data['pixel_tracking_id']
    })
    
    record_exists = newsletter_record is not None
    test_result("Creates newsletter_sends record", record_exists)
    
    if newsletter_record:
        correct_initial_state = (
            newsletter_record['opened'] == False and
            newsletter_record['open_count'] == 0 and
            newsletter_record['first_opened_at'] is None
        )
        test_result("Newsletter record has correct initial state", correct_initial_state)
    
    # Verify link click records
    link_records = list(link_clicks_collection.find({'newsletter_id': 'test-newsletter-001'}))
    correct_link_records = len(link_records) == 2
    test_result("Creates link_clicks records", correct_link_records, 
                f"Created {len(link_records)} link click records")
    
except Exception as e:
    test_result("Create newsletter tracking", False, f"Error: {str(e)}")
    import traceback
    traceback.print_exc()


# Test 3: Tracking Pixel Endpoint
print("\n" + "-"*80)
print("Test 3: Tracking Pixel Endpoint")
print("-"*80)

try:
    with app.test_client() as client:
        # Test with valid tracking ID
        pixel_tracking_id = tracking_data['pixel_tracking_id']
        response = client.get(f'/api/track/pixel/{pixel_tracking_id}')
        
        is_png = response.content_type == 'image/png'
        test_result("Returns PNG for valid tracking_id", is_png, 
                   f"Content-Type: {response.content_type}")
        
        is_200 = response.status_code == 200
        test_result("Returns 200 status", is_200, f"Status: {response.status_code}")
        
        # Verify database was updated
        updated_record = newsletter_sends_collection.find_one({
            'tracking_id': pixel_tracking_id
        })
        
        was_logged = (
            updated_record and
            updated_record['opened'] == True and
            updated_record['open_count'] == 1 and
            updated_record['first_opened_at'] is not None
        )
        test_result("Logs email open event", was_logged, 
                   f"Open count: {updated_record.get('open_count', 0) if updated_record else 0}")
        
        # Test multiple opens
        response2 = client.get(f'/api/track/pixel/{pixel_tracking_id}')
        updated_record2 = newsletter_sends_collection.find_one({
            'tracking_id': pixel_tracking_id
        })
        
        handles_multiple = (
            updated_record2 and
            updated_record2['open_count'] == 2 and
            updated_record2['last_opened_at'] != updated_record2['first_opened_at']
        )
        test_result("Handles multiple opens", handles_multiple, 
                   f"Open count: {updated_record2.get('open_count', 0) if updated_record2 else 0}")
        
        # Test with invalid tracking ID
        response3 = client.get('/api/track/pixel/invalid-tracking-id-12345')
        
        fails_silently = response3.status_code == 200 and response3.content_type == 'image/png'
        test_result("Returns PNG for invalid tracking_id (fails silently)", fails_silently)
        
except Exception as e:
    test_result("Tracking pixel endpoint", False, f"Error: {str(e)}")
    import traceback
    traceback.print_exc()


# Test 4: Link Redirect Endpoint
print("\n" + "-"*80)
print("Test 4: Link Redirect Endpoint")
print("-"*80)

try:
    with app.test_client() as client:
        # Test with valid tracking ID
        article_url = 'https://example.com/article1'
        link_tracking_id = tracking_data['link_tracking_map'][article_url]
        
        response = client.get(f'/api/track/click/{link_tracking_id}', follow_redirects=False)
        
        is_redirect = response.status_code == 302
        test_result("Returns 302 redirect", is_redirect, f"Status: {response.status_code}")
        
        correct_location = response.location == article_url
        test_result("Redirects to correct URL", correct_location, 
                   f"Location: {response.location}")
        
        # Verify database was updated
        click_record = link_clicks_collection.find_one({
            'tracking_id': link_tracking_id
        })
        
        was_logged = (
            click_record and
            click_record['clicked'] == True and
            click_record['clicked_at'] is not None
        )
        test_result("Logs click event", was_logged)
        
        # Test with invalid tracking ID
        response2 = client.get('/api/track/click/invalid-tracking-id-12345', follow_redirects=False)
        
        redirects_on_invalid = response2.status_code == 302
        test_result("Redirects on invalid tracking_id", redirects_on_invalid, 
                   f"Redirects to: {response2.location}")
        
except Exception as e:
    test_result("Link redirect endpoint", False, f"Error: {str(e)}")
    import traceback
    traceback.print_exc()


# Clean up test data
print("\n" + "-"*80)
print("Cleaning up test data...")
print("-"*80)

try:
    newsletter_sends_collection.delete_many({'newsletter_id': 'test-newsletter-001'})
    link_clicks_collection.delete_many({'newsletter_id': 'test-newsletter-001'})
    print("✓ Test data cleaned up")
except Exception as e:
    print(f"⚠  Error cleaning up: {str(e)}")


# Summary
print("\n" + "="*80)
print("TEST SUMMARY")
print("="*80)
print(f"Total tests: {tests_passed + tests_failed}")
print(f"✓ Passed: {tests_passed}")
print(f"❌ Failed: {tests_failed}")

if tests_failed == 0:
    print("\n🎉 All tests passed!")
else:
    print(f"\n⚠  {tests_failed} test(s) failed")

print("="*80 + "\n")

# Exit with appropriate code
sys.exit(0 if tests_failed == 0 else 1)