from flask import Flask, jsonify, Response, request
from flask_sqlalchemy import SQLAlchemy
from esales.flask_esales import Esales
from api.helpers import check_api_key
from api.exceptions import ValidationError

db = SQLAlchemy()
esales = Esales()


def create_app(config_name='config'):
    app = Flask(__name__)
    app.config.from_object(config_name)

    db.init_app(app)
    esales.init_app(app)

    # register errors handlers
    @app.errorhandler(404)
    def on_404(error):
        response = jsonify(
            {'status': 404, 'message': 'The requested resource was not found'})
        response.status_code = 404
        return response

    @app.errorhandler(ValidationError)
    def on_validation_error(error):
        response = jsonify({'status': 400, 'message': error.message})
        response.status_code = 400
        return response

    # register resources
    from api.resources import server, designers, categories
    app.register_blueprint(server.mod)
    app.register_blueprint(designers.mod)
    app.register_blueprint(categories.mod)

    # authentication
    app.before_request(check_api_key)

    return app