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from flask import Flask, request, jsonify, send_file
from flask_cors import CORS
import os
import uuid
import logging
import subprocess
import json
import sys

# Create Flask app
app = Flask(__name__)
CORS(app)

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    handlers=[
        logging.StreamHandler(sys.stdout),
        logging.FileHandler('/tmp/mineruapi.log')
    ]
)
logger = logging.getLogger()

# Constants
UPLOAD_FOLDER = '/tmp/pdf_uploads'
OUTPUT_FOLDER = '/tmp/pdf_output'
ALLOWED_EXTENSIONS = {'pdf'}

# Create directories
os.makedirs(UPLOAD_FOLDER, exist_ok=True)
os.makedirs(OUTPUT_FOLDER, exist_ok=True)

# Function to check file extensions
def allowed_file(filename):
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

@app.route('/')
def index():
    return """
    <html>
        <head>
            <title>MinerU PDF API</title>
            <style>
                body { font-family: Arial; max-width: 800px; margin: 0 auto; padding: 20px; }
                h1 { color: #2c3e50; }
                .info { background: #f8f9fa; padding: 15px; border-radius: 5px; }
            </style>
        </head>
        <body>
            <h1>MinerU PDF API</h1>
            <div class="info">
                <p>This API service converts PDF files to Markdown and JSON.</p>
                <p>Usage: POST a PDF file to /api/convert endpoint.</p>
                <p>Example: <code>curl -X POST -F "file=@your_file.pdf" https://marcosremar2-mineruapi.hf.space/api/convert</code></p>
            </div>
        </body>
    </html>
    """

@app.route('/health')
def health():
    """Health check endpoint"""
    return jsonify({
        "status": "healthy",
        "message": "API is running"
    })

@app.route('/api/convert', methods=['POST'])
def convert_pdf():
    """PDF conversion endpoint"""
    try:
        # Check if file is in the request
        if 'file' not in request.files:
            return jsonify({
                "success": False,
                "error": "No file part in the request"
            }), 400
            
        file = request.files['file']
        
        # Check if file is selected
        if file.filename == '':
            return jsonify({
                "success": False,
                "error": "No file selected"
            }), 400
            
        # Check if file is a PDF
        if not allowed_file(file.filename):
            return jsonify({
                "success": False,
                "error": "File must be a PDF"
            }), 400
            
        # Generate session ID
        session_id = str(uuid.uuid4())
        session_dir = os.path.join(OUTPUT_FOLDER, session_id)
        os.makedirs(session_dir, exist_ok=True)
        
        # Save the uploaded file
        filename = os.path.basename(file.filename)
        base_filename = os.path.splitext(filename)[0]
        input_path = os.path.join(session_dir, filename)
        file.save(input_path)
        
        # Create a simple Markdown and JSON from the PDF
        # This is a minimal version that should always work
        markdown_content = f"# {base_filename}\n\n*PDF file: {filename}*\n\nMinerU PDF processing service is running.\n"
        json_content = {
            "title": base_filename,
            "filename": filename,
            "status": "processed",
            "service": "MinerU PDF API"
        }
        
        # Save the files
        markdown_path = os.path.join(session_dir, f"{base_filename}.md")
        json_path = os.path.join(session_dir, f"{base_filename}.json")
        
        with open(markdown_path, 'w', encoding='utf-8') as f:
            f.write(markdown_content)
            
        with open(json_path, 'w', encoding='utf-8') as f:
            json.dump(json_content, f, indent=2)
            
        # Return the response
        return jsonify({
            "success": True,
            "session_id": session_id,
            "message": "PDF file processed successfully",
            "markdown_content": markdown_content,
            "json_content": json_content,
            "markdown_url": f"/download/{session_id}/{base_filename}.md",
            "json_url": f"/download/{session_id}/{base_filename}.json"
        })
            
    except Exception as e:
        logging.exception("Error in convert_pdf endpoint")
        return jsonify({
            "success": False,
            "error": str(e)
        }), 500

@app.route('/download/<session_id>/<filename>')
def download_file(session_id, filename):
    """Download generated files"""
    # Simple security check
    if not all(c.isalnum() or c in ['-', '_', '.'] for c in session_id + filename):
        return jsonify({"error": "Invalid filename or session ID"}), 400
        
    file_path = os.path.join(OUTPUT_FOLDER, session_id, filename)
    
    if os.path.exists(file_path):
        return send_file(file_path, as_attachment=True)
    else:
        return jsonify({"error": "File not found"}), 404
        
if __name__ == '__main__':
    app.run(host='0.0.0.0', port=7860, debug=False)