use anyhow::Result;
use log::*;
use std::fs::File;
use std::io::{Read, Write};
use std::path::PathBuf;

use crate::compression_engine::CompressionEngine;

#[derive(Debug, Eq, PartialEq, Clone, Default)]
pub struct CompressionEngineNone {}

impl CompressionEngineNone {
    pub fn new() -> CompressionEngineNone {
        CompressionEngineNone {}
    }
}

impl CompressionEngine for CompressionEngineNone {
    fn size(&self, file_path: PathBuf) -> Result<usize> {
        let item_file_metadata = file_path.metadata()?;
        Ok(item_file_metadata.len() as usize)
    }

    fn open(&self, file_path: PathBuf) -> Result<Box<dyn Read>> {
        debug!("COMPRESSION: Opening {:?} using {:?}", file_path, *self);
        Ok(Box::new(File::open(file_path)?))
    }

    fn create(&self, file_path: PathBuf) -> Result<Box<dyn Write>> {
        debug!("COMPRESSION: Writting to {:?} using {:?}", file_path, *self);
        Ok(Box::new(File::create(file_path)?))
    }
}