use encoding_rs::Encoding;

use crate::encoding_for_label;

pub fn decode_utf8(bytes: &[u8]) -> String {
    encoding_rs::UTF_8
        .decode_with_bom_removal(bytes)
        .0
        .into_owned()
}

pub fn decode_classic_script_source(
    bytes: &[u8],
    headers: &[(String, Vec<u8>)],
    script_charset: Option<&str>,
    document_character_set: Option<&str>,
) -> String {
    let encoding = Encoding::for_bom(bytes)
        .map(|(encoding, _)| encoding)
        .or_else(|| {
            moli_web_mime::extract_response_mime_type(headers)
                .and_then(|mime| mime.parameter("charset").and_then(encoding_for_label))
        })
        .or_else(|| script_charset.and_then(encoding_for_label))
        .or_else(|| document_character_set.and_then(encoding_for_label))
        .unwrap_or(encoding_rs::UTF_8);
    encoding.decode_with_bom_removal(bytes).0.into_owned()
}