#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sqlite3 import connect
from sqlite3 import PARSE_DECLTYPES
from sqlite3 import Row

from click import command
from click import echo
from quart import current_app
from quart import g


def get_db():
    """
    Connect to the application's configured database. The
    connection is unique for each request and will be
    reused if this is called again.
    """

    if not hasattr(g, "db"):
        g.db = connect(
            current_app.config["DATABASE"],
            detect_types=PARSE_DECLTYPES,
        )
        db.row_factory = Row
    return g.db


def close_db(exception=None):
    """
    If this request connected to the database, close the
    connection.
    """

    db = g.pop("db", None)
    if db is not None:
        db.close()


def init_db():
    """
    Clear existing data and create new tables.
    """

    db = get_db()
    with current_app.open_resource("schema.sql") as file:
        db.executescript(file.read().decode("utf8"))


@command("init-db")
def init_db_command():
    """
    Clear existing data and create new tables.
    """

    init_db()
    echo("Database initialized.")


def init_app(app):
    """
    Register database functions with the Flask app. This
    is called by the application factory.
    """

    app.teardown_appcontext(close_db)
    app.cli.add_command(init_db_command)