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use std::{fs::File, io::Read, path::Path};

use encoding_rs::{EUC_JP, UTF_8};

use crate::{error::LinderaErrorKind, LinderaResult};

pub fn read_file(filename: &Path) -> LinderaResult<Vec<u8>> {
    let mut input_read = File::open(filename)
        .map_err(|err| LinderaErrorKind::Io.with_error(anyhow::anyhow!(err)))?;
    let mut buffer = Vec::new();
    input_read
        .read_to_end(&mut buffer)
        .map_err(|err| LinderaErrorKind::Io.with_error(anyhow::anyhow!(err)))?;
    Ok(buffer)
}

pub fn read_euc_file(filename: &Path) -> LinderaResult<String> {
    let buffer = read_file(filename)?;
    Ok(EUC_JP.decode(&buffer).0.into_owned())
}

pub fn read_utf8_file(filename: &Path) -> LinderaResult<String> {
    let buffer = read_file(filename)?;
    Ok(UTF_8.decode(&buffer).0.into_owned())
}