"""Меняет связь Redmine и Clockify с один-к-одному на один-ко-многим."""

import sqlite3


def upgrade(connection: sqlite3.Connection):
    """Переносит внешний ключ записи Redmine в активности Clockify."""
    connection.execute(
        """ALTER TABLE activity
           ADD COLUMN time_entry_id INTEGER REFERENCES time_entry(id)"""
    )
    connection.execute(
        """UPDATE activity
           SET time_entry_id = (
               SELECT time_entry.id
               FROM time_entry
               WHERE time_entry.activity_id = activity.id
               LIMIT 1
           )"""
    )
    connection.execute(
        """CREATE TABLE time_entry_new (
               id INTEGER PRIMARY KEY,
               description VARCHAR NOT NULL,
               date DATETIME NOT NULL,
               time_spent NUMERIC NOT NULL,
               task_id INTEGER NOT NULL,
               activity_type_id INTEGER NOT NULL,
               author_id INTEGER NOT NULL,
               FOREIGN KEY (author_id) REFERENCES user(id),
               FOREIGN KEY (task_id) REFERENCES task(id),
               FOREIGN KEY (activity_type_id) REFERENCES activity_type(id)
           )"""
    )
    connection.execute(
        """INSERT INTO time_entry_new(
               id, description, date, time_spent, task_id, activity_type_id, author_id
           )
           SELECT id, description, date, time_spent, task_id, activity_type_id, author_id
           FROM time_entry"""
    )
    connection.execute("DROP TABLE time_entry")
    connection.execute("ALTER TABLE time_entry_new RENAME TO time_entry")
    connection.execute(
        "CREATE INDEX activity_time_entry_id_idx ON activity(time_entry_id)"
    )