use std::fmt::Display;

use pretty::RcDoc;
use kordophone::model::Conversation;

pub struct ConversationPrinter<'a> {
    doc: RcDoc<'a, Conversation>
}

impl<'a> ConversationPrinter<'a> {
    pub fn new(conversation: &'a Conversation) -> Self {
        let preview = conversation.last_message_preview
            .as_deref()
            .unwrap_or("<null>")
            .replace('\n', " ");

        let doc = RcDoc::text(format!("<Conversation: \"{}\"", &conversation.guid))
            .append(
                RcDoc::line()
                    .append("Display Name: ")
                    .append(conversation.display_name.as_deref().unwrap_or("<null>"))
                .append(RcDoc::line())
                    .append("Date: ")
                    .append(conversation.date.to_string())
                .append(RcDoc::line())
                    .append("Participants: ")
                    .append("[")
                    .append(RcDoc::line()
                        .append(
                            conversation.participant_display_names
                                .iter()
                                .map(|name| 
                                    RcDoc::text(name)
                                        .append(",")
                                        .append(RcDoc::line())
                                )
                                .fold(RcDoc::nil(), |acc, x| acc.append(x))
                        )
                        .nest(4)
                    )
                    .append("]")
                .append(RcDoc::line())
                    .append("Last Message Preview: ")
                    .append(preview)
                .nest(4)
            )
            .append(RcDoc::line())
            .append(">");

        ConversationPrinter { doc }
    }
}

impl<'a> Display for ConversationPrinter<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        self.doc.render_fmt(180, f)
    }
}