import sqlite3
import click

# From https://flask.palletsprojects.com/en/3.0.x/tutorial/database/

from flask import current_app, g
# Apparently g is a sort of a general per-request bucket, so that
# multiple parallel requests won't collide.

# Initializes the connection and stores it in g.
def get_db():
    if 'db' not in g:
        g.db = sqlite3.connect(
            current_app.config['DATABASE'],
            detect_types=sqlite3.PARSE_DECLTYPES
        )
#        g.db.row_factory = sqlite3.Row

    return g.db

# Close and remove from g.
def close_db(e=None):
    db = g.pop('db', None)

    if db is not None:
        db.close()

# This iniitalizes the database.  Will empty our table if called.        
def init_db():
    db = get_db()

    with current_app.open_resource('schema.sql') as f:
        db.executescript(f.read().decode('utf8'))

# Not sure what this is. Seems to tie it to a command on flask command line.
@click.command('init-db')
def init_db_command():
    """Clear the existing data and create new tables."""
    #from __init__ import create_app
    #app = create_app()
    #with app.app_context():
    init_db()
    click.echo('Initialized the database.')

# This is to be called by the factory.  It adds the operations to the
# context to be called automatically.
def init_app(app):
    app.teardown_appcontext(close_db)
    app.cli.add_command(init_db_command)