from flask import Flask, request, jsonify
from flask_cors import CORS
import random
from datetime import datetime, timedelta

app = Flask(__name__)
CORS(app)

# Mock data generator
def generate_mock_campaigns(count=50):
    campaigns = []
    statuses = ['active', 'ended']
    
    for i in range(count):
        start_date = datetime.now() - timedelta(days=random.randint(1, 180))
        end_date = start_date + timedelta(days=random.randint(7, 60))
        
        campaign = {
            'id': f'campaign_{i+1}',
            'name': f'营销活动 {i+1}',
            'status': random.choice(statuses),
            'startTime': start_date.strftime('%Y-%m-%d'),
            'endTime': end_date.strftime('%Y-%m-%d'),
            'metrics': {
                'impressions': random.randint(10000, 1000000),
                'clicks': random.randint(100, 50000),
                'conversions': random.randint(10, 5000),
                'roi': round(random.uniform(0.5, 15.0), 2)
            }
        }
        campaigns.append(campaign)
    
    return campaigns

# Generate mock data
MOCK_CAMPAIGNS = generate_mock_campaigns()

@app.route('/api/marketing/campaigns', methods=['GET'])
def get_campaign_list():
    # Get query parameters
    start_date = request.args.get('startDate')
    end_date = request.args.get('endDate')
    status = request.args.get('status', 'all')
    keyword = request.args.get('keyword', '')
    page = int(request.args.get('page', 1))
    page_size = int(request.args.get('pageSize', 12))
    
    # Filter campaigns
    filtered_campaigns = MOCK_CAMPAIGNS.copy()
    
    # Filter by status
    if status != 'all':
        filtered_campaigns = [c for c in filtered_campaigns if c['status'] == status]
    
    # Filter by keyword
    if keyword:
        filtered_campaigns = [c for c in filtered_campaigns if keyword.lower() in c['name'].lower()]
    
    # Filter by date range (simplified - just check if campaign overlaps with range)
    if start_date and end_date:
        filtered_campaigns = [
            c for c in filtered_campaigns 
            if c['startTime'] <= end_date and c['endTime'] >= start_date
        ]
    
    # Pagination
    total = len(filtered_campaigns)
    start_idx = (page - 1) * page_size
    end_idx = start_idx + page_size
    paginated_campaigns = filtered_campaigns[start_idx:end_idx]
    
    return jsonify({
        'total': total,
        'data': paginated_campaigns
    })

@app.route('/health', methods=['GET'])
def health_check():
    return jsonify({'status': 'ok'})

if __name__ == '__main__':
    print("Starting Marketing Campaign Overview Server...")
    print("Frontend should connect to: http://localhost:5000")
    app.run(debug=True, host='0.0.0.0', port=5000)