Send GM status update email on every attendance change

When a player's attendance is updated — either via email (awp-cli check)
or via the web toggle — an email is sent to the GM with:
  - who changed, what they changed to, and how (email or the site)
  - a summary count of attending/not attending/no response
  - the full current player status list

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cmd/cli/cmd/check.go

@@ -87,12 +87,12 @@ will attend the next session.`,
 							player.Attending = attending
 							log.Default().Printf("Received player response for %s: %s", player.Name, player.Attending)
 							if !player.Gm {
-								if err := sendEventNotice(
-									session,
-									"Received player response",
-									fmt.Sprintf(`Player %s has responded with %q`, player.Name, player.Attending),
-								); err != nil {
-									log.Default().Printf("ERROR: %s", err)
+								gmEmail := session.GMEmail()
+								if gmEmail != "" {
+									subject, body := session.FormatStatusUpdate(player.Name, attending, "email")
+									if err := sendNotice(gmEmail, subject, body); err != nil {
+										log.Default().Printf("ERROR sending GM notification: %s", err)
+									}
 								}
 							}
 						} else {

cmd/web/routes.go

@@ -12,6 +12,7 @@ import (
 	"github.com/golang-jwt/jwt/v4"
 	"github.com/hculpan/areweplaying/cmd/web/templates"
 	"github.com/hculpan/areweplaying/pkg/data"
+	"github.com/hculpan/areweplaying/pkg/email"
 )
 
 func routes(r *chi.Mux) {
@@ -145,23 +146,32 @@ func GenerateJWTAndStoreInCookie(w http.ResponseWriter, key []byte) error {
 func updatePlayerAttending(name, attending string, session data.Session) error {
 	for i, p := range session.Players {
 		if p.Name == name {
+			var newAttending string
 			switch strings.ToLower(attending) {
 			case "yes", "no":
-				session.Players[i].Attending = strings.ToLower(attending)
-				return data.PersistSession(session)
+				newAttending = strings.ToLower(attending)
 			case "toggle":
-				newAttending := session.Players[i].Attending
-				switch newAttending {
+				switch session.Players[i].Attending {
 				case "unknown", "no":
 					newAttending = "yes"
-				case "yes":
+				default:
 					newAttending = "no"
 				}
-				session.Players[i].Attending = newAttending
-				return data.PersistSession(session)
 			default:
 				return fmt.Errorf("unrecognized attending indicator %q", attending)
 			}
+			session.Players[i].Attending = newAttending
+			if err := data.PersistSession(session); err != nil {
+				return err
+			}
+			if gmEmail := session.GMEmail(); gmEmail != "" {
+				subject, body := session.FormatStatusUpdate(name, newAttending, "the site")
+				e := email.NewEmail([]string{gmEmail}, []string{}, gmEmail, subject, body)
+				if err := email.SendEmail(e); err != nil {
+					log.Default().Printf("ERROR sending GM notification: %s", err)
+				}
+			}
+			return nil
 		}
 	}
 

pkg/data/data.go

@@ -1,5 +1,10 @@
 package data
 
+import (
+	"fmt"
+	"strings"
+)
+
 const (
 	DATE_FORMAT string = "Monday Jan 2, 2006 3:04pm"
 )
@@ -20,6 +25,45 @@ type Session struct {
 	Password      string   `json:"password"`
 }
 
+func (s *Session) GMEmail() string {
+	for _, p := range s.Players {
+		if p.Gm {
+			return p.Email
+		}
+	}
+	return ""
+}
+
+func (s *Session) FormatStatusUpdate(playerName, newStatus, source string) (string, string) {
+	subject := fmt.Sprintf("Player Status Update: %s → %s", playerName, newStatus)
+
+	var yes, no, unknown int
+	for _, p := range s.Players {
+		switch p.Attending {
+		case "yes":
+			yes++
+		case "no":
+			no++
+		default:
+			unknown++
+		}
+	}
+
+	var sb strings.Builder
+	fmt.Fprintf(&sb, "%s has updated their status to %q (via %s).\n\n", playerName, newStatus, source)
+	fmt.Fprintf(&sb, "Attending: %d  |  Not attending: %d  |  No response: %d\n\n", yes, no, unknown)
+	sb.WriteString("Current player status:\n")
+	for _, p := range s.Players {
+		role := ""
+		if p.Gm {
+			role = " (GM)"
+		}
+		fmt.Fprintf(&sb, "  %s%s: %s\n", p.Name, role, p.Attending)
+	}
+
+	return subject, sb.String()
+}
+
 func (s *Session) GetPlayerByEmail(addr string) *Player {
 	for i, p := range s.Players {
 		if addr == p.Email {