Global code ovehaul - remove CAS and other, add 15 minute greet check

- Remove CAS, as it no longer works for us
- Remove other checks
- Implement 15 minute greet timeout check
- Fix chat logos
- Ditch thirdparty logger, use stdlib log facility wrapper for logging

internal/elog/message.go

@@ -0,0 +1,127 @@
+package elog
+
+import (
+	"github.com/NicoNex/echotron/v3"
+)
+
+// LogMessage records a chat message.
+//
+// It handles both ordinary messages — text, media, captions, replies — and the
+// service messages Telegram delivers as a Message with a field set instead of
+// text: joins, leaves, title changes, pins, migrations, forum topics. A message
+// with nothing describable is skipped rather than logged as noise.
+func LogMessage(msg *echotron.Message) {
+	logMessage(msg, "")
+}
+
+// LogEditedMessage records an edited message. The line is marked "edited" so a
+// reader can tell it apart from the original.
+func LogEditedMessage(msg *echotron.Message) {
+	logMessage(msg, "edited ")
+}
+
+// logMessage is the shared body of LogMessage and LogEditedMessage.
+func logMessage(msg *echotron.Message, prefix string) {
+	if _, on := chatLogRoot(); !on || msg == nil {
+		return
+	}
+
+	for _, body := range describeMessage(msg) {
+		appendLine(msg.Chat.ID, prefix+renderLine(msg.Chat, msg.From, body))
+	}
+}
+
+// describeMessage returns one rendered body per line to write. It returns more
+// than one only for a multi-member join, where one line per newcomer keeps each
+// fact greppable instead of cramming every newcomer onto one line.
+func describeMessage(msg *echotron.Message) []string {
+	if bodies := describeService(msg); len(bodies) > 0 {
+		return bodies
+	}
+
+	body := describePayload(msg)
+	if body == "" {
+		return nil
+	}
+
+	if msg.ReplyToMessage != nil {
+		body += " reply_to=" + itoaInt(msg.ReplyToMessage.ID)
+	}
+
+	return []string{body}
+}
+
+// describeService renders the service-message fields, newest-first, and returns
+// nil when the message is not a service message.
+func describeService(msg *echotron.Message) []string {
+	var bodies []string
+
+	// A join with N newcomers writes N lines.
+	for _, u := range msg.NewChatMembers {
+		if u == nil {
+			continue
+		}
+
+		bodies = append(bodies, describeReference(u)+" joined the chat")
+	}
+
+	if msg.LeftChatMember != nil {
+		bodies = append(bodies, describeReference(msg.LeftChatMember)+" left the chat")
+	}
+
+	if msg.NewChatTitle != "" {
+		bodies = append(bodies, "chat title changed to "+msg.NewChatTitle)
+	}
+
+	if len(msg.NewChatPhoto) > 0 {
+		bodies = append(bodies, "chat photo changed")
+	}
+
+	if msg.PinnedMessage != nil {
+		bodies = append(bodies, "pinned message "+itoaInt(msg.PinnedMessage.ID))
+	}
+
+	if msg.GroupChatCreated {
+		bodies = append(bodies, "group chat created")
+	}
+
+	if msg.MigrateToChatID != 0 {
+		bodies = append(bodies, "chat migrated to "+itoa(int64(msg.MigrateToChatID)))
+	}
+
+	if msg.MigrateFromChatID != 0 {
+		bodies = append(bodies, "chat migrated from "+itoa(int64(msg.MigrateFromChatID)))
+	}
+
+	if msg.ConnectedWebsite != "" {
+		bodies = append(bodies, "connected website "+msg.ConnectedWebsite)
+	}
+
+	if msg.ForumTopicCreated != nil {
+		bodies = append(bodies, "forum topic "+msg.ForumTopicCreated.Name+" created")
+	}
+
+	if msg.ForumTopicClosed != nil {
+		bodies = append(bodies, "forum topic closed")
+	}
+
+	if msg.ForumTopicReopened != nil {
+		bodies = append(bodies, "forum topic reopened")
+	}
+
+	if msg.GeneralForumTopicHidden != nil {
+		bodies = append(bodies, "general forum topic hidden")
+	}
+
+	if msg.GeneralForumTopicUnhidden != nil {
+		bodies = append(bodies, "general forum topic unhidden")
+	}
+
+	if msg.VideoChatScheduled != nil {
+		bodies = append(bodies, "video chat scheduled")
+	}
+
+	return bodies
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */