# Copyright 2019 3YOURMIND GmbH

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

# http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import re

from .base import BaseAnalyser


class SqliteAnalyser(BaseAnalyser):
    migration_tests = [
        {
            "code": "RENAME_TABLE",
            "fn": lambda sql, **kw: re.search("ALTER TABLE .* RENAME TO", sql)
            and "__old" not in sql
            and "new__" not in sql,
        },
        {
            "code": "DROP_TABLE",
            # TODO: improve to detect that the table names overlap
            "fn": lambda sql_statements, **kw: any(
                sql.startswith("DROP TABLE") for sql in sql_statements
            )
            and not any(sql.startswith("CREATE TABLE") for sql in sql_statements),
            "err_msg": "DROPPING table",
            "mode": "transaction",
        },
        {
            "code": "NOT_NULL",
            "fn": lambda sql_statements, **kw: any(
                re.search("NOT NULL(?! PRIMARY)(?! DEFAULT)", sql)
                for sql in sql_statements
            )
            and any(
                re.search("ALTER TABLE .* RENAME TO", sql)
                and ("__old" in sql or "new__" in sql)
                for sql in sql_statements
            ),
            "mode": "transaction",
        },
        {
            "code": "ADD_UNIQUE",
            "fn": lambda sql, **kw: sql.startswith("CREATE UNIQUE INDEX"),
        },
    ]