from flask import Flask
from flask_session import Session
from flask_sqlalchemy import SQLAlchemy
from flask_bcrypt import Bcrypt
from flask_login import LoginManager
from flask_mail import Mail
from flask_migrate import Migrate
from minibase.config import AppConfig

# (DATABASE) Definition
db = SQLAlchemy()

# (PASSWORD) Hashing Module to save paswords safely
bcrypt = Bcrypt()

# (LOGIN) Login manage plugin configuration
login_manager = LoginManager()
login_manager.login_view = 'user.login'        # User management (current_user) 
login_manager.login_message_category = 'info'   # Boostrap Info Message

# (EMAIL AGENT) Definition
mail = Mail() # So that we can send mails

# (SESSION) Starts the curren flask session
session = Session()

# Definition of custom filter for Jinja2 
def get_attr(obj, attr):
    print(obj)
    print(attr)
    return(getattr(obj, attr.strip(), None) )

def create_app():
    # (APP) Definition
    app = Flask(__name__)
    # (APP) Configure configuration
    app.config.from_object(AppConfig)
    # (DATABASE) Initialisation
    db.init_app(app)
    # (PASSWORD) Initialisation
    bcrypt.init_app(app)
    # (LOGIN) Initialisation
    login_manager.init_app(app)
    # (EMAIL AGENT) Initialisation
    mail.init_app(app)
    # Session for variable manipulation on server side

    # (DATABASE) Linking the app and the Database
    Migrate(app, db)

    # (BLUEPRINTS) Importing the blueprints. 
    # Include are made here to awoid the Circular import issues
    from minibase.blueprints.main.routes import main
    from minibase.blueprints.user.routes import user
    from minibase.blueprints.errors.routes import errors
    from minibase.blueprints.company.routes import company
    from minibase.blueprints.geography.routes import geography
    from minibase.blueprints.sensor.routes import sensor
    from minibase.blueprints.database.routes import database
    #from minibase.blueprints.item.routes import item

    # (BLUEPRINTS) Registering the blueprints. 
    # Giving them theie ulr_prefixes that will define their links on the webBrowser.
    app.register_blueprint(main, url_prefix='/')
    app.register_blueprint(user, url_prefix='/user')
    app.register_blueprint(errors, url_prefix='/errors')
    app.register_blueprint(company, url_prefix='/company')
    app.register_blueprint(geography, url_prefix='/geography')
    app.register_blueprint(sensor, url_prefix='/sensor')
    app.register_blueprint(database, url_prefix='/database')

    # Addinf the custom get_attr() filter to Jinja2 template engine 
    app.add_template_filter(get_attr)

    # (APP) Returning the initialised app 
    return app