use anyhow::{Error, Result};
use boitalettres::proto::Response;
use imap_codec::types::command::CommandBody;
use imap_codec::types::core::Tag;
use imap_codec::types::fetch_attributes::MacroOrFetchAttributes;
use imap_codec::types::response::{Response as ImapRes, Status};
use imap_codec::types::sequence::SequenceSet;

use crate::imap::command::authenticated;
use crate::imap::flow;
use crate::imap::session::InnerContext;
use crate::mail::Mailbox;

pub async fn dispatch<'a>(
    inner: InnerContext<'a>,
    user: &'a flow::User,
    mailbox: &'a Mailbox,
) -> Result<(Response, flow::Transition)> {
    let ctx = StateContext {
        tag: &inner.req.tag,
        inner,
        user,
        mailbox,
    };

    match &ctx.inner.req.body {
        CommandBody::Fetch {
            sequence_set,
            attributes,
            uid,
        } => ctx.fetch(sequence_set, attributes, uid).await,
        _ => authenticated::dispatch(ctx.inner, user).await,
    }
}

// --- PRIVATE ---

struct StateContext<'a> {
    inner: InnerContext<'a>,
    user: &'a flow::User,
    mailbox: &'a Mailbox,
    tag: &'a Tag,
}

impl<'a> StateContext<'a> {
    pub async fn fetch(
        &self,
        sequence_set: &SequenceSet,
        attributes: &MacroOrFetchAttributes,
        uid: &bool,
    ) -> Result<(Response, flow::Transition)> {
        Ok((
            vec![ImapRes::Status(
                Status::bad(Some(self.tag.clone()), None, "Not implemented").map_err(Error::msg)?,
            )],
            flow::Transition::No,
        ))
    }
}