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use std::{fmt, io};

use crate::{client::Client, Headers};

/// A message received on a subject.
#[derive(Clone)]
pub struct Message {
    /// The subject this message came from.
    pub subject: String,

    /// Optional reply subject that may be used for sending a response to this
    /// message.
    pub reply: Option<String>,

    /// The message contents.
    pub data: Vec<u8>,

    /// Optional headers associated with this `Message`.
    pub headers: Option<Headers>,

    /// Client for publishing on the reply subject.
    #[doc(hidden)]
    pub client: Client,
}

impl Message {
    /// Respond to a request message.
    pub fn respond(&self, msg: impl AsRef<[u8]>) -> io::Result<()> {
        match self.reply.as_ref() {
            None => Err(io::Error::new(
                io::ErrorKind::InvalidInput,
                "no reply subject available",
            )),
            Some(reply) => self.client.publish(reply, None, None, msg.as_ref()),
        }
    }
}

impl fmt::Debug for Message {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
        f.debug_struct("Message")
            .field("subject", &self.subject)
            .field("headers", &self.headers)
            .field("reply", &self.reply)
            .field("length", &self.data.len())
            .finish()
    }
}

impl fmt::Display for Message {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let mut body = format!("[{} bytes]", self.data.len());
        if let Ok(str) = std::str::from_utf8(&self.data) {
            body = str.to_string();
        }
        if let Some(reply) = &self.reply {
            write!(
                f,
                "Message {{\n  subject: \"{}\",\n  reply: \"{}\",\n  data: \
                 \"{}\"\n}}",
                self.subject, reply, body
            )
        } else {
            write!(
                f,
                "Message {{\n  subject: \"{}\",\n  data: \"{}\"\n}}",
                self.subject, body
            )
        }
    }
}