/*
 * The MIT License (MIT)
 * Copyright (C) 2024 Huawei Device Co., Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 */

use std::mem::ManuallyDrop;

use crate::JsString;

#[cfg(feature = "latin1")]
use crate::Result;

pub struct JsStringLatin1 {
  pub(crate) inner: JsString,
  pub(crate) buf: ManuallyDrop<Vec<u8>>,
}

impl JsStringLatin1 {
  pub fn as_slice(&self) -> &[u8] {
    &self.buf
  }

  pub fn len(&self) -> usize {
    self.buf.len()
  }

  pub fn is_empty(&self) -> bool {
    self.buf.is_empty()
  }

  pub fn take(self) -> Vec<u8> {
    self.as_slice().to_vec()
  }

  pub fn into_value(self) -> JsString {
    self.inner
  }

  #[cfg(feature = "latin1")]
  pub fn into_latin1_string(self) -> Result<String> {
    let mut dst_str = unsafe { String::from_utf8_unchecked(vec![0; self.len() * 2 + 1]) };
    encoding_rs::mem::convert_latin1_to_str(self.buf.as_slice(), dst_str.as_mut_str());
    Ok(dst_str)
  }
}

impl From<JsStringLatin1> for Vec<u8> {
  fn from(value: JsStringLatin1) -> Self {
    value.take()
  }
}