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//  Copyright 2024 Foyer Project Authors
//
//  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.

// TODO(MrCroxx): unify compress interface?

use clap::ValueEnum;
use serde::{Deserialize, Serialize};

use crate::error::Error;

/// The compression algorithm of the disk cache.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, ValueEnum)]
pub enum Compression {
    /// No compression enabled.
    None,
    /// Use zstd compression.
    Zstd,
    /// Use lz4 compression.
    Lz4,
}

impl Compression {
    /// Get the u8 that represent the compression algorithm.
    pub fn to_u8(&self) -> u8 {
        match self {
            Self::None => 0,
            Self::Zstd => 1,
            Self::Lz4 => 2,
        }
    }
}

impl From<Compression> for u8 {
    fn from(value: Compression) -> Self {
        match value {
            Compression::None => 0,
            Compression::Zstd => 1,
            Compression::Lz4 => 2,
        }
    }
}

impl TryFrom<u8> for Compression {
    type Error = Error;

    fn try_from(value: u8) -> Result<Self, Self::Error> {
        match value {
            0 => Ok(Self::None),
            1 => Ok(Self::Zstd),
            2 => Ok(Self::Lz4),
            _ => Err(Error::CompressionAlgorithmNotSupported(value)),
        }
    }
}