from .database import *


def get_all_extension_data_keys(name: str) -> list[str]:
    result: list[str] = []
    for row in read_all(name, 'select key from extension_data'):
        result.append(row['key'])
    return result


def get_all_extension_data(name: str) -> dict[str, Any]:
    result: dict[str, Any] = {}
    for row in read_all(name, 'select key, value from extension_data'):
        result[row['key']] = row['value']
    return result


def get_extension_data(name: str, key: str) -> str | None:
    if key == None or key == '':
        return None
    row = try_read(name, f"select value from extension_data where key = '{key}'")
    if row == None:
        return None
    return row['value']


def _set_extension_data(name: str, cs: ChangeSet) -> DbChangeSet:
    op = cs.operations[0]
    key, new_val = op['key'], op['value']

    f_new_val = f"'{new_val}'" if new_val != None else 'null'

    old_val = get_extension_data(name, key)
    f_old_val = f"'{old_val}'" if old_val != None else 'null'

    redo_sql = f"delete from extension_data where key = '{key}';"
    if new_val != None:
        redo_sql += f"insert into extension_data (key, value) values ('{key}', {f_new_val});"

    undo_sql = f"delete from extension_data where key = '{key}';"
    if old_val != None:
        undo_sql += f"insert into extension_data (key, value) values ('{key}', {f_old_val});"

    redo_cs = g_update_prefix | { 'type': 'extension_data', 'key': key, 'value': new_val }
    undo_cs = g_update_prefix | { 'type': 'extension_data', 'key': key, 'value': old_val }

    return DbChangeSet(redo_sql, undo_sql, [redo_cs], [undo_cs])


def set_extension_data(name: str, cs: ChangeSet) -> ChangeSet:
    if len(cs.operations) != 1:
        return ChangeSet()

    op = cs.operations[0]
    if 'key' not in op or 'value' not in op:
        return ChangeSet()

    key = op['key']
    if key == None or key == '':
        return ChangeSet()

    return execute_command(name, _set_extension_data(name, cs))