import sqlite3

import click
from flask import current_app, g
from flask.cli import with_appcontext


def get_db(mod_path=None):
    if 'db' not in g:
        # provide modified path if is not None
        if mod_path is None:
            path=current_app.config["DATABASE_URI"]
        else:
            path=mod_path
        g.db = sqlite3.connect(
            path,
            detect_types=sqlite3.PARSE_DECLTYPES
        )
        g.db.row_factory = sqlite3.Row

    return g.db

def close_db(e=None):
    db = g.pop('db', None)

    if db is not None:
        db.close()


@click.command('init-db')
@with_appcontext
def init_db_command():
    """Clear the existing data and create new tables."""
    path = "./users.db"
    db = get_db(mod_path="users.db")

    with current_app.open_resource('schema.sql') as f:
        db.executescript(f.read().decode('utf8'))    
        
    click.echo('Initialized the database at %s. Copy it to the according directory.'% path)

def init_app(app):
    app.teardown_appcontext(close_db)
    app.cli.add_command(init_db_command)