use std::fmt::Display;
use time::OffsetDateTime;
use pretty::RcDoc;
use dbus::arg::{self, RefArg};

pub struct PrintableConversation {
    pub guid: String,
    pub date: OffsetDateTime,
    pub unread_count: i32,
    pub last_message_preview: Option<String>,
    pub participants: Vec<String>,
    pub display_name: Option<String>,
}

impl From<kordophone::model::Conversation> for PrintableConversation {
    fn from(value: kordophone::model::Conversation) -> Self {
        Self {
            guid: value.guid, 
            date: value.date,
            unread_count: value.unread_count,
            last_message_preview: value.last_message_preview,
            participants: value.participant_display_names,
            display_name: value.display_name,
        }
    }
}

impl From<kordophone_db::models::Conversation> for PrintableConversation {
    fn from(value: kordophone_db::models::Conversation) -> Self {
        Self {
            guid: value.guid,
            date: OffsetDateTime::from_unix_timestamp(value.date.and_utc().timestamp()).unwrap(),
            unread_count: value.unread_count.into(),
            last_message_preview: value.last_message_preview,
            participants: value.participants.into_iter().map(|p| p.display_name()).collect(),
            display_name: value.display_name,
        }
    }
}

impl From<arg::PropMap> for PrintableConversation {
    fn from(value: arg::PropMap) -> Self {
        Self {
            guid: value.get("guid").unwrap().as_str().unwrap().to_string(),
            date: OffsetDateTime::from_unix_timestamp(value.get("date").unwrap().as_i64().unwrap()).unwrap(),
            unread_count: value.get("unread_count").unwrap().as_i64().unwrap().try_into().unwrap(),
            last_message_preview: value.get("last_message_preview").unwrap().as_str().map(|s| s.to_string()),
            participants: value.get("participants")
                .unwrap()
                .0
                .as_iter()
                .unwrap()
                .map(|s| s.as_str().unwrap().to_string())
                .collect(),
            display_name: value.get("display_name").unwrap().as_str().map(|s| s.to_string()),
        }
    }
}

pub struct PrintableMessage {
    pub guid: String,
    pub date: OffsetDateTime,
    pub sender: String,
    pub text: String,
}

impl From<kordophone::model::Message> for PrintableMessage {
    fn from(value: kordophone::model::Message) -> Self {
        Self {
            guid: value.guid,
            date: value.date,
            sender: value.sender.unwrap_or("<me>".to_string()),
            text: value.text,
        }
    }
}

impl From<kordophone_db::models::Message> for PrintableMessage {
    fn from(value: kordophone_db::models::Message) -> Self {
        Self {
            guid: value.id,
            date: OffsetDateTime::from_unix_timestamp(value.date.and_utc().timestamp()).unwrap(),
            sender: value.sender.display_name(),
            text: value.text,
        }
    }
}

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

impl<'a> ConversationPrinter<'a> {
    pub fn new(conversation: &'a PrintableConversation) -> 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("Unread Count: ")
                    .append(conversation.unread_count.to_string())
                .append(RcDoc::line())
                    .append("Participants: ")
                    .append("[")
                    .append(RcDoc::line()
                        .append(
                            conversation.participants
                                .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)
    }
}

pub struct MessagePrinter<'a> {
    doc: RcDoc<'a, PrintableMessage>
}

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

impl<'a> MessagePrinter<'a> {
    pub fn new(message: &'a PrintableMessage) -> Self {
        let doc = RcDoc::text(format!("<Message: \"{}\"", &message.guid))
        .append(
            RcDoc::line()
                .append("Date: ")
                .append(message.date.to_string())
            .append(RcDoc::line())
                .append("Sender: ")
                .append(&message.sender)
            .append(RcDoc::line())
                .append("Body: ")
                .append(&message.text)
            .nest(4)
        )
        .append(RcDoc::line())
        .append(">");

        MessagePrinter { doc }
    }
}