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//
// Wildland Project
//
// Copyright © 2022 Golem Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3 as published by
// the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use std::path::{Path, PathBuf};

use thiserror::Error;
use wildland_corex::dfs::interface::{DfsFrontendError, IStream, OStream};

pub trait EncryptionModule {
    fn wrap_istream(&self, istream: Box<dyn IStream>) -> Box<dyn IStream>;
    fn wrap_ostream(&self, ostream: Box<dyn OStream>) -> Box<dyn OStream>;

    fn encode_data(&self, input: &[u8]) -> Result<Vec<u8>, EncryptionModuleError>;
    fn encode_path(&self, input: &Path) -> Result<PathBuf, EncryptionModuleError>;

    fn decode_data(&self, input: &[u8]) -> Result<Vec<u8>, EncryptionModuleError>;
    fn decode_path(&self, input: &Path) -> Result<PathBuf, EncryptionModuleError>;
    fn decode_plain(&self, input: String) -> Result<String, EncryptionModuleError>;
}

#[derive(Error, Debug)]
pub enum EncryptionModuleError {
    #[error("Failed To Decode, data may be corrupted {0}")]
    Decode(String),

    #[error("Failed To Encode {0}")]
    Encode(String),

    #[error("UnknownError {0}")]
    Unknown(String),
}

impl From<EncryptionModuleError> for DfsFrontendError {
    fn from(e: EncryptionModuleError) -> Self {
        match e {
            EncryptionModuleError::Decode(msg) => DfsFrontendError::Encryption(msg),
            EncryptionModuleError::Encode(msg) => DfsFrontendError::Encryption(msg),
            EncryptionModuleError::Unknown(msg) => DfsFrontendError::Encryption(msg),
        }
    }
}

impl From<base64::DecodeError> for EncryptionModuleError {
    fn from(e: base64::DecodeError) -> Self {
        EncryptionModuleError::Decode(e.to_string())
    }
}