from flask import Blueprint, Response
from pathlib import Path
from jinja2 import Template
from datetime import datetime
from database import articles_collection

newsletter_bp = Blueprint('newsletter', __name__)


@newsletter_bp.route('/api/newsletter/preview', methods=['GET'])
def preview_newsletter():
    """Preview the newsletter HTML (for testing)"""
    try:
        # Get latest articles with AI summaries
        cursor = articles_collection.find(
            {'summary': {'$exists': True, '$ne': None}}
        ).sort('created_at', -1).limit(10)
        
        articles = []
        for doc in cursor:
            articles.append({
                'title': doc.get('title', ''),
                'author': doc.get('author'),
                'link': doc.get('link', ''),
                'summary': doc.get('summary', ''),
                'source': doc.get('source', ''),
                'published_at': doc.get('published_at', '')
            })
        
        if not articles:
            return Response(
                "<h1>No articles with summaries found</h1><p>Run the crawler with Ollama enabled first.</p>",
                mimetype='text/html'
            )
        
        # Load template
        template_path = Path(__file__).parent.parent / 'templates' / 'newsletter_template.html'
        with open(template_path, 'r', encoding='utf-8') as f:
            template_content = f.read()
        
        template = Template(template_content)
        
        # Prepare data
        now = datetime.now()
        template_data = {
            'date': now.strftime('%A, %B %d, %Y'),
            'year': now.year,
            'article_count': len(articles),
            'articles': articles,
            'unsubscribe_link': 'http://localhost:3000/unsubscribe',
            'website_link': 'http://localhost:3000'
        }
        
        # Render and return HTML
        html_content = template.render(**template_data)
        return Response(html_content, mimetype='text/html')
        
    except Exception as e:
        return Response(
            f"<h1>Error</h1><p>{str(e)}</p>",
            mimetype='text/html'
        ), 500