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use minicbor::{decode, encode, Decode, Decoder, Encode, Encoder};
use modality_api::{AttrVal, TimelineId};

pub use modality_api::protocol::{TAG_LOGICAL_TIME, TAG_NS, TAG_TIMELINE_ID};

#[cfg_attr(feature = "client", derive(Decode))]
#[derive(Debug)]
pub enum IngestResponse {
    #[n(1)]
    AuthResponse {
        #[n(0)]
        ok: bool,

        #[n(1)]
        message: Option<String>,
    },

    #[n(2)]
    UnauthenticatedResponse {},

    #[n(101)]
    IngestStatusResponse {
        #[n(0)]
        current_timeline: Option<TimelineId>,

        #[n(1)]
        events_received: u64,

        #[n(2)]
        events_written: u64,

        #[n(3)]
        events_pending: u64,
    },
}

#[cfg_attr(feature = "client", derive(Encode))]
#[derive(Debug)]
pub enum IngestMessage {
    #[n(0)]
    AuthRequest {
        #[n(0)]
        token: Vec<u8>,
    },

    #[n(100)]
    IngestStatusRequest {},

    #[n(102)]
    /// An advisory message, asking the server to immediately write any pending events to disk.
    Flush {},

    #[n(110)]
    DeclareAttrKey {
        #[n(0)]
        name: String,

        #[n(1)]
        wire_id: InternedAttrKey,
    },

    #[n(112)]
    OpenTimeline {
        #[n(0)]
        id: TimelineId,
    },

    #[n(113)]
    TimelineMetadata {
        #[n(0)]
        attrs: PackedAttrKvs<InternedAttrKey>,
    },

    #[n(114)]
    Event {
        #[n(0)]
        be_ordering: Vec<u8>,

        #[n(1)]
        attrs: PackedAttrKvs<InternedAttrKey>,
    },
}

/// The numeric representation of an `AttrKey` after it has been declared on a connection.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
#[repr(transparent)]
pub struct InternedAttrKey(pub(crate) u32);

impl From<u32> for InternedAttrKey {
    fn from(i: u32) -> Self {
        InternedAttrKey(i)
    }
}

impl From<InternedAttrKey> for u32 {
    fn from(i: InternedAttrKey) -> u32 {
        i.0
    }
}

impl Encode for InternedAttrKey {
    fn encode<W: encode::Write>(&self, e: &mut Encoder<W>) -> Result<(), encode::Error<W::Error>> {
        e.u32(self.0)?;
        Ok(())
    }
}

impl<'b> Decode<'b> for InternedAttrKey {
    fn decode(d: &mut Decoder<'b>) -> Result<Self, decode::Error> {
        let i = d.u32()?;
        Ok(i.into())
    }
}

/// A way to bundle together attr kvs for transport purposes.  The 'u32' is meant to represent an
/// attr key, where the name->number mapping is defined elsewhere in the protocol.
///
/// These are encoded in cbor in a 'reasonably compact' way: an array of alternating u32 key and
/// AttrVals.
#[derive(Debug)]
pub struct PackedAttrKvs<K: Into<u32> + Copy + std::fmt::Debug>(pub Vec<(K, AttrVal)>);

impl<K: Into<u32> + Copy + std::fmt::Debug> Encode for PackedAttrKvs<K> {
    fn encode<W: encode::Write>(&self, e: &mut Encoder<W>) -> Result<(), encode::Error<W::Error>> {
        e.array((self.0.len() * 2) as u64)?;
        for (k, v) in self.0.iter() {
            e.u32((*k).into())?;
            v.encode(e)?;
        }

        Ok(())
    }
}