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from flask import Flask, request, render_template_string
from openai import OpenAI
import os
import json
from urllib.parse import quote
import html

app = Flask(__name__)

# Initialize OpenAI client with API key and base URL from environment variables
client = OpenAI(
    api_key=os.environ["OPENAI_API_KEY"],
    base_url=os.environ["OPENAI_BASE_URL"]
)

# Define constants for pagination
RESULTS_PER_PAGE = 10
TOTAL_RESULTS = 30  # Generate 30 results to allow pagination

def fetch_search_results(query):
    """Fetch search results from the LLM based on the user's query."""
    if not query.strip():
        return None, "Please enter a search query."
    
    prompt = f"""
    You are a search engine that provides informative and relevant results. For the given query '{query}', 
    generate {TOTAL_RESULTS} search results. Each result should include:
    - 'title': A concise, descriptive title of the result.
    - 'snippet': A short summary (2-3 sentences) of the content.
    - 'url': A plausible, clickable URL where the information might be found (e.g., a real or hypothetical website).
    Format the response as a JSON array of objects, where each object has 'title', 'snippet', and 'url' fields.
    Ensure the results are diverse, relevant to the query, and the URLs are realistic (e.g., https://example.com/page).
    """
    
    try:
        response = client.chat.completions.create(
            model="gemini-2.0-flash-lite",  # Updated model name
            messages=[
                {"role": "system", "content": "You are a helpful search engine."},
                {"role": "user", "content": prompt}
            ],
            response_format={"type": "json_object"}
        )
        
        content = response.choices[0].message.content
        results = json.loads(content)
        
        # Handle different possible JSON structures
        if isinstance(results, dict) and "results" in results:
            results = results["results"]
        elif isinstance(results, list):
            pass
        else:
            return None, "Error: Unexpected JSON structure."
        
        return results, None
    
    except Exception as e:
        error_msg = str(e)
        if "404" in error_msg:
            return None, f"Error 404: Model or endpoint not found. Check OPENAI_BASE_URL ({os.environ['OPENAI_BASE_URL']}) and model name."
        elif "401" in error_msg:
            return None, "Error 401: Invalid API key. Check OPENAI_API_KEY."
        else:
            return None, f"Error: {error_msg}"

@app.route('/', methods=['GET'])
def search_page():
    """Generate and serve the search results page."""
    query = request.args.get('query', '')
    page = request.args.get('page', '1')
    try:
        page = int(page)
    except ValueError:
        page = 1
    
    if not query.strip():
        html_content = """
        <html>
        <head><title>LLM Search Engine</title></head>
        <body style="font-family: Arial, sans-serif;">
            <h1>LLM Search Engine</h1>
            <form method="get" action="/">
                <input type="text" name="query" placeholder="Type your search here...">
                <input type="submit" value="Search">
                <input type="hidden" name="page" value="1">
            </form>
            <p>Please enter a search query.</p>
        </body>
        </html>
        """
        return render_template_string(html_content)
    
    results, error = fetch_search_results(query)
    
    if error:
        html_content = f"""
        <html>
        <head><title>LLM Search Engine</title></head>
        <body style="font-family: Arial, sans-serif;">
            <h1>LLM Search Engine</h1>
            <form method="get" action="/">
                <input type="text" name="query" value="{html.escape(query)}">
                <input type="submit" value="Search">
                <input type="hidden" name="page" value="1">
            </form>
            <p style="color: red;">{error}</p>
        </body>
        </html>
        """
        return render_template_string(html_content)
    
    # Calculate pagination boundaries
    start_idx = (page - 1) * RESULTS_PER_PAGE
    end_idx = start_idx + RESULTS_PER_PAGE
    total_pages = (len(results) + RESULTS_PER_PAGE - 1) // RESULTS_PER_PAGE
    
    # Ensure indices are within bounds
    if start_idx >= len(results):
        html_content = f"""
        <html>
        <head><title>LLM Search Engine</title></head>
        <body style="font-family: Arial, sans-serif;">
            <h1>LLM Search Engine</h1>
            <form method="get" action="/">
                <input type="text" name="query" value="{html.escape(query)}">
                <input type="submit" value="Search">
                <input type="hidden" name="page" value="1">
            </form>
            <p>No more results to display.</p>
        </body>
        </html>
        """
        return render_template_string(html_content)
    
    paginated_results = results[start_idx:end_idx]
    
    # Generate full HTML page
    html_content = f"""
    <html>
    <head>
        <title>LLM Search Engine</title>
        <style>
            body {{
                font-family: Arial, sans-serif;
                margin: 0;
                padding: 20px;
                max-width: 800px;
                margin-left: auto;
                margin-right: auto;
            }}
            .search-box input[type="text"] {{
                width: 70%;
                padding: 8px;
                font-size: 16px;
                border: 1px solid #dfe1e5;
                border-radius: 4px;
            }}
            .search-box input[type="submit"] {{
                padding: 8px 16px;
                font-size: 14px;
                background-color: #f8f9fa;
                border: 1px solid #dfe1e5;
                border-radius: 4px;
                cursor: pointer;
            }}
            .search-result {{
                margin-bottom: 20px;
            }}
            .search-result a {{
                color: #1a0dab;
                font-size: 18px;
                text-decoration: none;
            }}
            .search-result a:hover {{
                text-decoration: underline;
            }}
            .search-result .url {{
                color: #006621;
                font-size: 14px;
                margin: 2px 0;
            }}
            .search-result p {{
                color: #545454;
                font-size: 14px;
                margin: 2px 0;
            }}
            .pagination {{
                margin-top: 20px;
                text-align: center;
            }}
            .pagination a, .pagination span {{
                margin: 0 10px;
                color: #1a0dab;
                text-decoration: none;
            }}
            .pagination a:hover {{
                text-decoration: underline;
            }}
        </style>
    </head>
    <body>
        <h1>LLM Search Engine</h1>
        <form class="search-box" method="get" action="/">
            <input type="text" name="query" value="{html.escape(query)}">
            <input type="submit" value="Search">
            <input type="hidden" name="page" value="1">
        </form>
        <h2>Results for '{html.escape(query)}' (Page {page} of {total_pages})</h2>
        <div class="results">
    """
    
    for result in paginated_results:
        title = html.escape(result.get("title", "No title"))
        snippet = html.escape(result.get("snippet", "No snippet"))
        url = html.escape(result.get("url", "#"))
        html_content += f"""
        <div class="search-result">
            <a href="{url}" target="_blank">{title}</a>
            <div class="url">{url}</div>
            <p>{snippet}</p>
        </div>
        """
    
    # Pagination links
    encoded_query = quote(query)
    prev_link = f'<a href="/?query={encoded_query}&page={page-1}">Previous</a>' if page > 1 else '<span>Previous</span>'
    next_link = f'<a href="/?query={encoded_query}&page={page+1}">Next</a>' if page < total_pages else '<span>Next</span>'
    html_content += f"""
        </div>
        <div class="pagination">
            {prev_link}
            <span>Page {page} of {total_pages}</span>
            {next_link}
        </div>
    </body>
    </html>
    """
    
    return render_template_string(html_content)

if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0', port=int(os.environ.get("PORT", 5000)))