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// Copyright 2023 Greptime Team
//
// 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.

use datatypes::prelude::ConcreteDataType;
use datatypes::schema::ColumnSchema;

pub fn string_columns(names: &[&'static str]) -> Vec<ColumnSchema> {
    names.iter().map(|name| string_column(name)).collect()
}

pub fn string_column(name: &str) -> ColumnSchema {
    ColumnSchema::new(
        str::to_lowercase(name),
        ConcreteDataType::string_datatype(),
        false,
    )
}

pub fn u32_column(name: &str) -> ColumnSchema {
    ColumnSchema::new(
        str::to_lowercase(name),
        ConcreteDataType::uint32_datatype(),
        false,
    )
}

pub fn i16_column(name: &str) -> ColumnSchema {
    ColumnSchema::new(
        str::to_lowercase(name),
        ConcreteDataType::int16_datatype(),
        false,
    )
}

pub fn bigint_column(name: &str) -> ColumnSchema {
    ColumnSchema::new(
        str::to_lowercase(name),
        ConcreteDataType::int64_datatype(),
        false,
    )
}

pub fn datetime_column(name: &str) -> ColumnSchema {
    ColumnSchema::new(
        str::to_lowercase(name),
        ConcreteDataType::datetime_datatype(),
        false,
    )
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_string_columns() {
        let columns = ["a", "b", "c"];
        let column_schemas = string_columns(&columns);

        assert_eq!(3, column_schemas.len());
        for (i, name) in columns.iter().enumerate() {
            let cs = column_schemas.get(i).unwrap();

            assert_eq!(*name, cs.name);
            assert_eq!(ConcreteDataType::string_datatype(), cs.data_type);
        }
    }
}