"""
Onlylegs Gallery
This is the main app file, it loads all the other files and sets up the app
"""

# Import system modules
import os
import logging

# Flask
from flask_compress import Compress
from flask_caching import Cache
from flask_assets import Environment, Bundle
from flask_login import LoginManager
from flask import Flask, render_template, abort
from werkzeug.exceptions import HTTPException

# Configuration
import platformdirs
from dotenv import load_dotenv
from yaml import safe_load

# Import database
from sqlalchemy.orm import sessionmaker
from gallery import db


USER_DIR = platformdirs.user_config_dir('onlylegs')


db_session = sessionmaker(bind=db.engine)
db_session = db_session()
login_manager = LoginManager()
assets = Environment()
cache = Cache(config={'CACHE_TYPE': 'SimpleCache', 'CACHE_DEFAULT_TIMEOUT': 300})
compress = Compress()


def create_app(test_config=None):
    """
    Create and configure the main app
    """
    app = Flask(__name__, instance_path=os.path.join(USER_DIR, 'instance'))

    # Get environment variables
    load_dotenv(os.path.join(USER_DIR, '.env'))
    print("Loaded environment variables")

    # Get config file
    with open(os.path.join(USER_DIR, 'conf.yml'), encoding='utf-8', mode='r') as file:
        conf = safe_load(file)
        print("Loaded config")

    # App configuration
    app.config.from_mapping(
        SECRET_KEY=os.environ.get('FLASK_SECRET'),
        DATABASE=os.path.join(app.instance_path, 'gallery.sqlite'),
        UPLOAD_FOLDER=os.path.join(USER_DIR, 'uploads'),
        ALLOWED_EXTENSIONS=conf['upload']['allowed-extensions'],
        MAX_CONTENT_LENGTH=1024 * 1024 * conf['upload']['max-size'],
        WEBSITE=conf['website'],
    )

    if test_config is None:
        app.config.from_pyfile('config.py', silent=True)
    else:
        app.config.from_mapping(test_config)

    login_manager.init_app(app)
    login_manager.login_view = 'gallery.index'
    login_manager.session_protection = 'strong'

    @login_manager.user_loader
    def load_user(user_id):
        return db_session.query(db.Users).filter_by(alt_id=user_id).first()

    @login_manager.unauthorized_handler
    def unauthorized():
        return render_template('error.html', error=401,
                               msg='You are not authorized to view this page!!!!'), 401

    # Load JS assets
    assets.register('js_pre', Bundle('js/pre/*.js', output='gen/pre_packed.js', depends='js/pre/*.js'))
    assets.register('js_post', Bundle('js/post/*.js', output='gen/post_packed.js', depends='js/pre/*.js'))
    assets.register('styles', Bundle('sass/*.sass', filters='libsass', output='gen/styles.css', depends='sass/**/*.sass'))

    # Error handlers, if the error is not a HTTP error, return 500
    @app.errorhandler(Exception)
    def error_page(err):  # noqa
        if not isinstance(err, HTTPException):
            abort(500)
        return render_template('error.html', error=err.code, msg=err.description), err.code

    # Load login, registration and logout manager
    from gallery import auth
    app.register_blueprint(auth.blueprint)

    # Load the different routes
    from gallery.views import api, groups, routing, settings
    app.register_blueprint(api.blueprint)
    app.register_blueprint(groups.blueprint)
    app.register_blueprint(routing.blueprint)
    app.register_blueprint(settings.blueprint)

    # Log to file that the app has started
    logging.info('Gallery started successfully!')

    # Initialize extensions and return app
    assets.init_app(app)
    cache.init_app(app)
    compress.init_app(app)
    return app