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)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow)

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

# This table stores email-wise last annotation timestamp
# only one entry per email
class AnnotationLastUpdate(db.Model):
    id = db.Column(db.String(36), primary_key=True, default=str(uuid.uuid4()))
    email = db.Column(db.String(255), nullable=False)
    last_update_time = db.Column(db.DateTime, nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow)

    def __repr__(self):
        return f'<AnnotationLastUpdate {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')
    readwise_api_key = data.get('readwise_api_key')

    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,
        readwise_api_key=readwise_api_key
    )
    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(id)
    if not token:
        return jsonify({'error': 'Token not found'}), 404
    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,
        'created_at': int(token.created_at.timestamp()),
        'updated_at': int(token.updated_at.timestamp())
    }
    return jsonify({'token': token_info}), 200

# API to get the token based on the email
@app.route('/token', methods=['GET'])
def get_token_by_email():
    email = request.args.get('email')
    if not email:
        return jsonify({'error': 'Missing email query parameter'}), 400
    token = Token.query.filter_by(email=email, active=True).first()
    if not token:
        return '', 204
    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,
        'created_at': int(token.created_at.timestamp()),
        'updated_at': int(token.updated_at.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.readwise_api_key = data.get('readwise_api_key', token.readwise_api_key)
    token.updated_at = datetime.utcnow()
    db.session.commit()
    return '', 204

# deactivate token
@app.route('/token/<id>/deactivate', methods=['POST'])
def deactivate_token_by_id(id):
    token = Token.query.get_or_404(id)
    token.active = False
    db.session.commit()
    return '', 204

#  get all tokens
@app.route('/token/all', methods=['GET'])
def get_all_tokens():
    only_active = request.args.get('only_active')
    tokens = Token.query.all() if not only_active else Token.query.filter_by(active=True).all()
    tokens_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,
        'created_at': int(token.created_at.timestamp()),
        'updated_at': int(token.updated_at.timestamp())
    } for token in tokens]
    return jsonify({'tokens': tokens_info}), 200

# API to create or update the last annotation timestamp
@app.route('/annotation_last_update', methods=['POST'])
def create_or_update_annotation_last_update():
    data = request.get_json()
    email = data.get('email')
    last_update_time = data.get('last_update_time')

    required_fields = ['email', 'last_update_time']
    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

    existing_annotation_last_update = AnnotationLastUpdate.query.filter_by(email=email).first()
    if existing_annotation_last_update:
        existing_annotation_last_update.last_update_time = last_update_time
        existing_annotation_last_update.updated_at = datetime.utcnow()
        db.session.commit()
        return '', 204
    else:
        new_annotation_last_update = AnnotationLastUpdate(
            email=email,
            last_update_time=last_update_time
        )
        db.session.add(new_annotation_last_update)
        db.session.commit()
        return '', 204

# API to get the last annotation timestamp based on the email
@app.route('/annotation_last_update/<email>', methods=['GET'])
def get_annotation_last_update_by_email(email):
    if not email:
        return jsonify({'error': 'Missing email query parameter'}), 400
    annotation_last_update = AnnotationLastUpdate.query.filter_by(email=email).first()
    if not annotation_last_update:
        return '', 204
    annotation_last_update_info = {
        'id': annotation_last_update.id,
        'email': annotation_last_update.email,
        'last_update_time': int(annotation_last_update.last_update_time.timestamp()),
        'created_at': int(annotation_last_update.created_at.timestamp()),
        'updated_at': int(annotation_last_update.updated_at.timestamp())
    }
    return jsonify(annotation_last_update_info), 200

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