Re-write the libs with discordgo

lib/member.go

@@ -0,0 +1,47 @@
+package lib
+
+import (
+	"github.com/bwmarrin/discordgo"
+)
+
+// InteractionUser represents a user from an interaction, abstracting away the differences
+// between guild members and DM users.
+type InteractionUser struct {
+	ID       string
+	Username string
+	Bot      bool
+}
+
+// GetUser extracts user information from an interaction, handling both guild and DM cases.
+func GetUser(i *discordgo.InteractionCreate) (*InteractionUser, error) {
+	if i.Member != nil && i.Member.User != nil {
+		// Guild interaction
+		return &InteractionUser{
+			ID:       i.Member.User.ID,
+			Username: i.Member.User.Username,
+			Bot:      i.Member.User.Bot,
+		}, nil
+	} else if i.User != nil {
+		// DM interaction
+		return &InteractionUser{
+			ID:       i.User.ID,
+			Username: i.User.Username,
+			Bot:      i.User.Bot,
+		}, nil
+	}
+
+	return nil, ThrowWithError("GetUser", "Unable to extract user information from interaction")
+}
+
+// IsInGuild checks if the interaction occurred in a guild.
+func IsInGuild(i *discordgo.InteractionCreate) bool {
+	return i.Member != nil
+}
+
+// GetGuildID safely retrieves the guild ID if the interaction is from a guild.
+func GetGuildID(i *discordgo.InteractionCreate) string {
+	if i.GuildID != "" {
+		return i.GuildID
+	}
+	return ""
+}