From 0d13edc8fdbf7f4bf69338ab59698acc767ef29e Mon Sep 17 00:00:00 2001
From: diamondburned <diamond@arikawa-hi.me>
Date: Wed, 3 Nov 2021 15:29:29 -0700
Subject: [PATCH] gateway: Add ClientState and Capabilities for Identify

This commit preps the gateway for user account usage.
---
 gateway/identify.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/gateway/identify.go b/gateway/identify.go
index 6ac4f30..8cb8b29 100644
--- a/gateway/identify.go
+++ b/gateway/identify.go
@@ -5,6 +5,7 @@ import (
 	"runtime"
 	"time"
 
+	"github.com/diamondburned/arikawa/v3/discord"
 	"github.com/diamondburned/arikawa/v3/utils/json/option"
 	"github.com/pkg/errors"
 	"golang.org/x/time/rate"
@@ -77,6 +78,14 @@ type IdentifyData struct {
 
 	Presence *UpdateStatusData `json:"presence,omitempty"`
 
+	// ClientState is the client state for a user's accuont. Bot accounts should
+	// NOT touch this field.
+	ClientState *ClientState `json:"client_state,omitempty"`
+
+	// Capabilities defines the client's capabilities when connecting to the
+	// gateway with a user account. Bot accounts should NOT touch this field.
+	// The official client sets this at 125 at the time of this commit.
+	Capabilities int `json:"capabilities,omitempty"`
 	// Intents specifies which groups of events the gateway
 	// connection will receive.
 	//
@@ -142,3 +151,14 @@ func (s Shard) ShardID() int {
 func (s Shard) NumShards() int {
 	return s[1]
 }
+
+// ClientState describes the undocumented client_state field in the Identify
+// command. Little is known about this type.
+type ClientState struct {
+	GuildHashes          map[discord.GuildID]interface{} `json:"guild_hashes"`            // {}
+	HighestLastMessageID discord.MessageID               `json:"highest_last_message_id"` // "0"
+
+	ReadStateVersion         int `json:"read_state_version"`          // 0
+	UserGuildSettingsVersion int `json:"user_guild_settings_version"` // -1
+	UserSettingsVersion      int `json:"user_settings_version"`       // -1
+}