from flask import Flask, jsonify, request
from flask_sqlalchemy import SQLAlchemy
from datetime import datetime
import uuid

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///tokens.db'  # Use SQLite for simplicity
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)

class Token(db.Model):
    id = db.Column(db.String(36), primary_key=True, default=str(uuid.uuid4()))
    email = db.Column(db.String(255), nullable=False)
    access_token = db.Column(db.String(255), nullable=False)
    refresh_token = db.Column(db.String(255), nullable=False)
    expiration_seconds = db.Column(db.Integer, nullable=False)
    readwise_api_key = db.Column(db.String(255))
    active = db.Column(db.Boolean, default=True)
    timestamp = db.Column(db.DateTime, default=datetime.utcnow)

    def __repr__(self):
        return f'<Token {self.id}>'

# Create an application context
with app.app_context():
    db.create_all()

# API to create a new token entry
@app.route('/token', methods=['POST'])
def create_token():
    data = request.get_json()
    email = data.get('email')
    access_token = data.get('access_token')
    refresh_token = data.get('refresh_token')
    expiration_seconds = data.get('expiration_seconds')

    required_fields = ['email', 'access_token', 'refresh_token', 'expiration_seconds']
    missing_fields = [field for field in required_fields if not data.get(field)]

    if missing_fields:
        return jsonify({'error': f'Missing required fields: {", ".join(missing_fields)}'}), 400

    # unique email when active is true
    existing_token = Token.query.filter_by(email=email, active=True).first()
    if existing_token:
        return jsonify({'error': 'An active token with this email already exists'}), 400

    new_token = Token(email=email, access_token=access_token, refresh_token=refresh_token, expiration_seconds=expiration_seconds)
    db.session.add(new_token)
    db.session.commit()

    return jsonify({'id': new_token.id}), 201

# API to get the token based on the id
@app.route('/token/<id>', methods=['GET'])
def get_token_by_id(id):
    token = Token.query.get_or_404(id)
    token_info = {
        'id': token.id,
        'email': token.email,
        'access_token': token.access_token,
        'refresh_token': token.refresh_token,
        'expiration_seconds': int(token.expiration_seconds),
        'readwise_api_key': token.readwise_api_key,
        'active': token.active,
        'timestamp': int(token.timestamp.timestamp())
    }
    return jsonify({'token': token_info}), 200

# API to update the token based on the id
@app.route('/token/<id>', methods=['PUT'])
def update_token_by_id(id):
    token = Token.query.get_or_404(id)
    data = request.get_json()
    token.access_token = data.get('access_token', token.access_token)
    token.refresh_token = data.get('refresh_token', token.refresh_token)
    token.expiration_seconds = data.get('expiration_seconds', token.expiration_seconds)
    token.active = data.get('active', token.active)
    token.readwise_api_key = data.get('readwise_api_key', token.readwise_api_key)
    db.session.commit()
    return '', 204

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000, debug=True)