from flask import Flask, request, jsonify, render_template
from flask_cors import CORS
import os
from werkzeug.utils import secure_filename
from chat_pdf import ChatPDF  #importing ChatPDF class

app = Flask(__name__)
CORS(app)
app.config['UPLOAD_FOLDER'] = 'uploads'
app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024  # 16MB max file size

# Ensure upload directory exists
os.makedirs(app.config['UPLOAD_FOLDER'], exist_ok=True)

# Initialize ChatPDF
chat_pdf = ChatPDF()

@app.route('/')
def index():
    return render_template('index.html')

@app.route('/upload', methods=['POST'])
def upload_file():
    if 'file' not in request.files:
        return jsonify({'error': 'No file part'}), 400
    
    file = request.files['file']
    if file.filename == '':
        return jsonify({'error': 'No selected file'}), 400

    if file and file.filename.endswith('.pdf'):
        filename = secure_filename(file.filename)
        filepath = os.path.join(app.config['UPLOAD_FOLDER'], filename)
        file.save(filepath)
        
        # Process the file with ChatPDF
        chat_pdf.ingest(file_path=filepath, file_name=filename)
        
        return jsonify({'message': 'File uploaded successfully'}), 200
    
    return jsonify({'error': 'Invalid file type'}), 400

@app.route('/chat', methods=['POST'])
def chat():
    data = request.json
    if not data or 'message' not in data:
        return jsonify({'error': 'No message provided'}), 400

    response = chat_pdf.ask(data['message'])
    return jsonify({'response': response}), 200

if __name__ == '__main__':
    app.run(debug=True)