from pydbkit.toolbase import SimpleTool
from pydbkit import pgbrowser


class ListTablesTool(SimpleTool):

    """
    List tables in database.

    Allows filtering by combination of conditions.
    (Currently only by options.)

    """

    def __init__(self):
        SimpleTool.__init__(self, name='listtables')

    def specify_args(self):
        SimpleTool.specify_args(self)
        self.parser.add_argument('-o', dest='options', type=str, nargs='*', help='Filter by options (eg. -o autovacuum_enabled=false).')

    def main(self):
        browser = pgbrowser.PgBrowser(self.pgm.get_conn('target'))

        # scan all tables from all shemas, remember names and sizes
        tables = []
        for schema in browser.schemas.values():
            for table in schema.tables.values():
                for option in self.args.options:
                    if option in table.options:
                        tables.append(table)

        # print result
        if len(tables):
            print('Found %d tables:' % len(tables))
        else:
            print('No table meets the conditions.')
        for table in tables:
            table_name = '%s.%s' % (table.schema.name, table.name)
            print(' ', table_name)


cls = ListTablesTool