use std::io::ErrorKind as IOErrKind;
use std::path::PathBuf;

use protobuf::Message as _;

use crate::cmd::open_submaildir;
use crate::error::Result;
use crate::pb3::jwebmail::{ShowReq, ShowResp};
use crate::rfc822::parsed_mail_to_mail;

pub fn read(path: PathBuf, req: &[u8]) -> Result<Vec<u8>> {
    let r = ShowReq::parse_from_bytes(req)?;
    let md = open_submaildir(path, &r.folder);

    md.add_flags(&r.mid, "S")?;

    let mut mail = md.find(&r.mid).ok_or_else(|| {
        std::io::Error::new(IOErrKind::NotFound, format!("mail {} not found", &r.mid))
    })?;

    let mut resp = ShowResp::new();
    resp.mail = Some(parsed_mail_to_mail(mail.parsed()?)?).into();
    resp.write_to_bytes().map_err(|e| e.into())
}