moqtap-codec 0.5.0

use crate::draft13::message::*;
use crate::fields::{FieldMap as Map, FieldValue as Value};
use crate::kvp::{KeyValuePair, KvpValue};
use crate::types::*;
use crate::varint::VarInt;

fn vi(v: u64) -> Value {
    Value::Uint(v)
}

fn ns_to_json(ns: &TrackNamespace) -> Value {
    Value::Array(
        ns.0.iter().map(|e| Value::Text(String::from_utf8_lossy(e).into_owned())).collect(),
    )
}

fn loc_to_json(loc: &Location) -> Value {
    let mut o = Map::new();
    o.insert("group".into(), vi(loc.group.into_inner()));
    o.insert("object".into(), vi(loc.object.into_inner()));
    Value::Map(o)
}

fn auth_token_to_json(bytes: &[u8]) -> Value {
    let mut buf = bytes;
    let alias_type = VarInt::decode(&mut buf).unwrap();
    let at = alias_type.into_inner();
    let mut o = Map::new();
    o.insert("alias_type".into(), vi(at));
    match at {
        // DELETE, USE_ALIAS: only token_alias
        0 | 2 => {
            let token_alias = VarInt::decode(&mut buf).unwrap();
            o.insert("token_alias".into(), vi(token_alias.into_inner()));
        }
        // REGISTER: token_alias + token_type + token_value
        1 => {
            let token_alias = VarInt::decode(&mut buf).unwrap();
            let token_type = VarInt::decode(&mut buf).unwrap();
            o.insert("token_alias".into(), vi(token_alias.into_inner()));
            o.insert("token_type".into(), vi(token_type.into_inner()));
            o.insert("token_value".into(), Value::Bytes(buf.to_vec()));
        }
        // USE_VALUE (3) or other: token_type + token_value
        _ => {
            let token_type = VarInt::decode(&mut buf).unwrap();
            o.insert("token_type".into(), vi(token_type.into_inner()));
            o.insert("token_value".into(), Value::Bytes(buf.to_vec()));
        }
    }
    Value::Map(o)
}

fn kvp_to_json_setup(params: &[KeyValuePair]) -> Value {
    let mut obj = Map::new();
    for p in params {
        let key = p.key.into_inner();
        match (key, &p.value) {
            (0x01, KvpValue::Bytes(b)) => {
                obj.insert("path".into(), Value::Text(String::from_utf8_lossy(b).into_owned()));
            }
            (0x02, KvpValue::Varint(v)) => {
                obj.insert("max_request_id".into(), vi(v.into_inner()));
            }
            (0x03, KvpValue::Bytes(b)) => {
                obj.insert("authorization_token".into(), auth_token_to_json(b));
            }
            (0x04, KvpValue::Varint(v)) => {
                obj.insert("max_auth_token_cache_size".into(), vi(v.into_inner()));
            }
            _ => {}
        }
    }
    Value::Map(obj)
}

fn kvp_to_json_msg(params: &[KeyValuePair]) -> Value {
    let mut obj = Map::new();
    for p in params {
        let key = p.key.into_inner();
        match (key, &p.value) {
            (0x03, KvpValue::Bytes(b)) => {
                obj.insert("authorization_token".into(), auth_token_to_json(b));
            }
            (0x02, KvpValue::Varint(v)) => {
                obj.insert("delivery_timeout".into(), vi(v.into_inner()));
            }
            (0x04, KvpValue::Varint(v)) => {
                obj.insert("max_cache_duration".into(), vi(v.into_inner()));
            }
            _ => {}
        }
    }
    Value::Map(obj)
}

/// This draft's field names for a decoded control message.
///
/// Keys are the names this draft gives its fields, in the order it defines
/// them. An optional field the message did not carry is absent rather than
/// zero.
pub fn message_fields(msg: &ControlMessage) -> Map {
    let obj = match msg {
        ControlMessage::ClientSetup(m) => {
            let mut o = Map::new();
            o.insert(
                "supported_versions".into(),
                Value::Array(m.supported_versions.iter().map(|v| vi(v.into_inner())).collect()),
            );
            o.insert("parameters".into(), kvp_to_json_setup(&m.parameters));
            o
        }
        ControlMessage::ServerSetup(m) => {
            let mut o = Map::new();
            o.insert("selected_version".into(), vi(m.selected_version.into_inner()));
            o.insert("parameters".into(), kvp_to_json_setup(&m.parameters));
            o
        }
        ControlMessage::GoAway(m) => {
            let mut o = Map::new();
            o.insert(
                "new_session_uri".into(),
                Value::Text(String::from_utf8_lossy(&m.new_session_uri).into_owned()),
            );
            o
        }
        ControlMessage::MaxRequestId(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o
        }
        ControlMessage::RequestsBlocked(m) => {
            let mut o = Map::new();
            o.insert("maximum_request_id".into(), vi(m.maximum_request_id.into_inner()));
            o
        }
        ControlMessage::Subscribe(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("track_namespace".into(), ns_to_json(&m.track_namespace));
            o.insert(
                "track_name".into(),
                Value::Text(String::from_utf8_lossy(&m.track_name).into_owned()),
            );
            o.insert("subscriber_priority".into(), vi(m.subscriber_priority as u64));
            o.insert("group_order".into(), vi(m.group_order as u64));
            o.insert("forward".into(), vi(m.forward as u64));
            o.insert("filter_type".into(), vi(m.filter_type as u64));
            if let Some(sg) = &m.start_group {
                o.insert("start_group".into(), vi(sg.into_inner()));
            }
            if let Some(so) = &m.start_object {
                o.insert("start_object".into(), vi(so.into_inner()));
            }
            if let Some(eg) = &m.end_group {
                o.insert("end_group".into(), vi(eg.into_inner()));
            }
            o.insert("parameters".into(), kvp_to_json_msg(&m.parameters));
            o
        }
        ControlMessage::SubscribeOk(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("track_alias".into(), vi(m.track_alias.into_inner()));
            o.insert("expires".into(), vi(m.expires.into_inner()));
            o.insert("group_order".into(), vi(m.group_order as u64));
            o.insert("content_exists".into(), vi(m.content_exists as u64));
            if let Some(loc) = &m.largest_location {
                o.insert("largest_location".into(), loc_to_json(loc));
            }
            o.insert("parameters".into(), kvp_to_json_msg(&m.parameters));
            o
        }
        ControlMessage::SubscribeError(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("error_code".into(), vi(m.error_code.into_inner()));
            o.insert(
                "reason_phrase".into(),
                Value::Text(String::from_utf8_lossy(&m.reason_phrase).into_owned()),
            );
            o
        }
        ControlMessage::SubscribeUpdate(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("start_group".into(), vi(m.start_group.into_inner()));
            o.insert("start_object".into(), vi(m.start_object.into_inner()));
            o.insert("end_group".into(), vi(m.end_group.into_inner()));
            o.insert("subscriber_priority".into(), vi(m.subscriber_priority as u64));
            o.insert("forward".into(), vi(m.forward as u64));
            o.insert("parameters".into(), kvp_to_json_msg(&m.parameters));
            o
        }
        ControlMessage::SubscribeDone(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("status_code".into(), vi(m.status_code.into_inner()));
            o.insert("stream_count".into(), vi(m.stream_count.into_inner()));
            o.insert(
                "reason_phrase".into(),
                Value::Text(String::from_utf8_lossy(&m.reason_phrase).into_owned()),
            );
            o
        }
        ControlMessage::Unsubscribe(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o
        }
        ControlMessage::Announce(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("track_namespace".into(), ns_to_json(&m.track_namespace));
            o.insert("parameters".into(), kvp_to_json_msg(&m.parameters));
            o
        }
        ControlMessage::AnnounceOk(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o
        }
        ControlMessage::AnnounceError(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("error_code".into(), vi(m.error_code.into_inner()));
            o.insert(
                "reason_phrase".into(),
                Value::Text(String::from_utf8_lossy(&m.reason_phrase).into_owned()),
            );
            o
        }
        ControlMessage::AnnounceCancel(m) => {
            let mut o = Map::new();
            o.insert("track_namespace".into(), ns_to_json(&m.track_namespace));
            o.insert("error_code".into(), vi(m.error_code.into_inner()));
            o.insert(
                "reason_phrase".into(),
                Value::Text(String::from_utf8_lossy(&m.reason_phrase).into_owned()),
            );
            o
        }
        ControlMessage::Unannounce(m) => {
            let mut o = Map::new();
            o.insert("track_namespace".into(), ns_to_json(&m.track_namespace));
            o
        }
        ControlMessage::SubscribeNamespace(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("track_namespace_prefix".into(), ns_to_json(&m.track_namespace_prefix));
            o.insert("parameters".into(), kvp_to_json_msg(&m.parameters));
            o
        }
        ControlMessage::SubscribeNamespaceOk(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o
        }
        ControlMessage::SubscribeNamespaceError(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("error_code".into(), vi(m.error_code.into_inner()));
            o.insert(
                "reason_phrase".into(),
                Value::Text(String::from_utf8_lossy(&m.reason_phrase).into_owned()),
            );
            o
        }
        ControlMessage::UnsubscribeNamespace(m) => {
            let mut o = Map::new();
            o.insert("track_namespace_prefix".into(), ns_to_json(&m.track_namespace_prefix));
            o
        }
        ControlMessage::TrackStatus(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("track_namespace".into(), ns_to_json(&m.track_namespace));
            o.insert(
                "track_name".into(),
                Value::Text(String::from_utf8_lossy(&m.track_name).into_owned()),
            );
            o.insert("subscriber_priority".into(), vi(m.subscriber_priority as u64));
            o.insert("group_order".into(), vi(m.group_order as u64));
            o.insert("forward".into(), vi(m.forward as u64));
            o.insert("filter_type".into(), vi(m.filter_type as u64));
            if let Some(sg) = &m.start_group {
                o.insert("start_group".into(), vi(sg.into_inner()));
            }
            if let Some(so) = &m.start_object {
                o.insert("start_object".into(), vi(so.into_inner()));
            }
            if let Some(eg) = &m.end_group {
                o.insert("end_group".into(), vi(eg.into_inner()));
            }
            o.insert("parameters".into(), kvp_to_json_msg(&m.parameters));
            o
        }
        ControlMessage::TrackStatusOk(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("track_alias".into(), vi(m.track_alias.into_inner()));
            o.insert("expires".into(), vi(m.expires.into_inner()));
            o.insert("group_order".into(), vi(m.group_order as u64));
            o.insert("content_exists".into(), vi(m.content_exists as u64));
            if let Some(loc) = &m.largest_location {
                o.insert("largest_location".into(), loc_to_json(loc));
            }
            o.insert("parameters".into(), kvp_to_json_msg(&m.parameters));
            o
        }
        ControlMessage::TrackStatusError(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("error_code".into(), vi(m.error_code.into_inner()));
            o.insert(
                "reason_phrase".into(),
                Value::Text(String::from_utf8_lossy(&m.reason_phrase).into_owned()),
            );
            o
        }
        ControlMessage::Fetch(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("subscriber_priority".into(), vi(m.subscriber_priority as u64));
            o.insert("group_order".into(), vi(m.group_order as u64));
            o.insert("fetch_type".into(), vi(m.fetch_type as u64));
            match &m.fetch_payload {
                FetchPayload::Standalone {
                    track_namespace,
                    track_name,
                    start_group,
                    start_object,
                    end_group,
                    end_object,
                } => {
                    o.insert("track_namespace".into(), ns_to_json(track_namespace));
                    o.insert(
                        "track_name".into(),
                        Value::Text(String::from_utf8_lossy(track_name).into_owned()),
                    );
                    o.insert("start_group".into(), vi(start_group.into_inner()));
                    o.insert("start_object".into(), vi(start_object.into_inner()));
                    o.insert("end_group".into(), vi(end_group.into_inner()));
                    o.insert("end_object".into(), vi(end_object.into_inner()));
                }
                FetchPayload::Joining { joining_request_id, joining_start } => {
                    // The key is the corpus's spelling, not this draft's. The
                    // draft renamed the field to Joining Request ID; the shared
                    // vector files still say joining_subscribe_id, and they are
                    // maintained elsewhere, so the name is translated here
                    // rather than changed there.
                    o.insert("joining_subscribe_id".into(), vi(joining_request_id.into_inner()));
                    o.insert("joining_start".into(), vi(joining_start.into_inner()));
                }
            }
            o.insert("parameters".into(), kvp_to_json_msg(&m.parameters));
            o
        }
        ControlMessage::FetchOk(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("group_order".into(), vi(m.group_order as u64));
            o.insert("end_of_track".into(), vi(m.end_of_track as u64));
            o.insert("end_location".into(), loc_to_json(&m.end_location));
            o.insert("parameters".into(), kvp_to_json_msg(&m.parameters));
            o
        }
        ControlMessage::FetchError(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("error_code".into(), vi(m.error_code.into_inner()));
            o.insert(
                "reason_phrase".into(),
                Value::Text(String::from_utf8_lossy(&m.reason_phrase).into_owned()),
            );
            o
        }
        ControlMessage::FetchCancel(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o
        }
        ControlMessage::Publish(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("track_namespace".into(), ns_to_json(&m.track_namespace));
            o.insert(
                "track_name".into(),
                Value::Text(String::from_utf8_lossy(&m.track_name).into_owned()),
            );
            o.insert("track_alias".into(), vi(m.track_alias.into_inner()));
            o.insert("group_order".into(), vi(m.group_order as u64));
            o.insert("content_exists".into(), vi(m.content_exists as u64));
            if let Some(loc) = &m.largest_location {
                o.insert("largest_location".into(), loc_to_json(loc));
            }
            o.insert("forward".into(), vi(m.forward as u64));
            o.insert("parameters".into(), kvp_to_json_msg(&m.parameters));
            o
        }
        ControlMessage::PublishOk(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("forward".into(), vi(m.forward as u64));
            o.insert("subscriber_priority".into(), vi(m.subscriber_priority as u64));
            o.insert("group_order".into(), vi(m.group_order as u64));
            o.insert("filter_type".into(), vi(m.filter_type as u64));
            if let Some(sg) = &m.start_group {
                o.insert("start_group".into(), vi(sg.into_inner()));
            }
            if let Some(so) = &m.start_object {
                o.insert("start_object".into(), vi(so.into_inner()));
            }
            if let Some(eg) = &m.end_group {
                o.insert("end_group".into(), vi(eg.into_inner()));
            }
            o.insert("parameters".into(), kvp_to_json_msg(&m.parameters));
            o
        }
        ControlMessage::PublishError(m) => {
            let mut o = Map::new();
            o.insert("request_id".into(), vi(m.request_id.into_inner()));
            o.insert("error_code".into(), vi(m.error_code.into_inner()));
            o.insert(
                "reason_phrase".into(),
                Value::Text(String::from_utf8_lossy(&m.reason_phrase).into_owned()),
            );
            o
        }
    };
    obj
}