import json
import os
import sys
# pylint: disable=wrong-import-position,wrong-import-order
import eventlet.tpool
eventlet.tpool.set_num_threads(2)

from munch import munchify
from pathlib import Path

from flask import Flask
from flask_htpasswd import HtPasswdAuth
from flask_migrate import Migrate
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy import event
from sqlalchemy import pool
from sqlalchemy.engine import Engine

from pycs.util.JSONEncoder import JSONEncoder


settings_file = os.environ.get("PYCS_SETTINGS", "settings.json")

print(f'=== Loading settings from "{settings_file}" ===')
with open(settings_file, encoding='utf8') as file:
    settings = munchify(json.load(file))

# create projects folder
if not os.path.exists(settings.projects_folder):
    os.mkdir(settings.projects_folder) # pragma: no-cover

DB_FILE = Path.cwd() / settings.database


app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = f"sqlite:///{DB_FILE}"
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False

# Protect via http basic authentication
app.config['FLASK_HTPASSWD_PATH'] = '.htpasswd'
if not os.path.isfile(app.config['FLASK_HTPASSWD_PATH']):
    raise FileNotFoundError("You need to specify a .htpasswd-file."
        f"The following file could not be located: {app.config['FLASK_HTPASSWD_PATH']}!")
app.config['FLASK_SECRET'] = 'Hey Hey Kids, secure me!'
htpasswd = HtPasswdAuth(app)

# set json encoder so database objects are serialized correctly
app.json_encoder = JSONEncoder

# pylint: disable=unused-argument
@event.listens_for(Engine, "connect")
def set_sqlite_pragma(dbapi_connection, connection_record):
    """ enables foreign keys on every established connection """
    cursor = dbapi_connection.cursor()
    cursor.execute("PRAGMA foreign_keys=ON")
    cursor.close()

db = SQLAlchemy(app, engine_options=dict(
    poolclass=pool.SingletonThreadPool,
    connect_args=dict(
        check_same_thread=False
        )
    )
)
migrate = Migrate(app, db)