Revert "Removed mistakes"

This reverts commit c052339b34.

:w

@@ -0,0 +1,97 @@
+package state
+
+import (
+	"errors"
+
+	"github.com/diamondburned/arikawa/discord"
+)
+
+// Store is the state storage. It should handle mutex itself, and it should only
+// concern itself with the local state.
+type Store interface {
+	StoreGetter
+	StoreModifier
+}
+
+type StoreMe interface {
+	Me() (*discord.User, error)
+	MyselfSet(me *discord.User) error
+}
+
+type StoreChannel interface {
+	Channel(id discord.Snowflake) (*discord.Channel, error)
+	Channels(guildID discord.Snowflake) ([]discord.Channel, error)
+	PrivateChannels() ([]discord.Channel, error)
+
+	// ChannelSet should switch on Type to know if it's a private channel or
+	// not.
+	ChannelSet(*discord.Channel) error
+	ChannelRemove(*discord.Channel) error
+}
+
+type StoreEmoji interface {
+	Emoji(guildID, emojiID discord.Snowflake) (*discord.Emoji, error)
+	Emojis(guildID discord.Snowflake) ([]discord.Emoji, error)
+	EmojiSet(guildID discord.Snowflake, emojis []discord.Emoji) error
+}
+
+type StoreGuild interface {
+	Guild(id discord.Snowflake) (*discord.Guild, error)
+	Guilds() ([]discord.Guild, error)
+	GuildSet(*discord.Guild) error
+	GuildRemove(id discord.Snowflake) error
+}
+
+type StoreMember interface {
+	Member(guildID, userID discord.Snowflake) (*discord.Member, error)
+	Members(guildID discord.Snowflake) ([]discord.Member, error)
+	MemberSet(guildID discord.Snowflake, member *discord.Member) error
+	MemberRemove(guildID, userID discord.Snowflake) error
+}
+
+type StoreMessage interface {
+	Message(channelID, messageID discord.Snowflake) (*discord.Message, error)
+	Messages(channelID discord.Snowflake) ([]discord.Message, error)
+	MaxMessages() int // used to know if the state is filled or not.
+	MessageSet(*discord.Message) error
+	MessageRemove(channelID, messageID discord.Snowflake) error
+}
+
+type StorePresence interface {
+	// These don't get fetched from the API, it's Gateway only.
+	Presence(guildID, userID discord.Snowflake) (*discord.Presence, error)
+	Presences(guildID discord.Snowflake) ([]discord.Presence, error)
+	PresenceSet(guildID discord.Snowflake, presence *discord.Presence) error
+	PresenceRemove(guildID, userID discord.Snowflake) error
+}
+
+// All methods in StoreGetter will be wrapped by the State. If the State can't
+// find anything in the storage, it will call the API itself and automatically
+// add what's missing into the storage.
+//
+// Methods that return with a slice should pay attention to race conditions that
+// would mutate the underlying slice (and as a result the returned slice as
+// well). The best way to avoid this is to copy the whole slice, like
+// DefaultStore does.
+type StoreGetter interface {
+
+
+
+	Role(guildID, roleID discord.Snowflake) (*discord.Role, error)
+	Roles(guildID discord.Snowflake) ([]discord.Role, error)
+}
+
+type StoreModifier interface {
+
+
+	RoleSet(guildID discord.Snowflake, role *discord.Role) error
+	RoleRemove(guildID, roleID discord.Snowflake) error
+
+	// This should reset all the state to zero/null.
+	Reset() error
+}
+
+// ErrStoreNotFound is an error that a store can use to return when something
+// isn't in the storage. There is no strict restrictions on what uses this (the
+// default one does, though), so be advised.
+var ErrStoreNotFound = errors.New("item not found in store")