From d4d43fe672f94ef6573ca1ab0f9d175ea9262ba4 Mon Sep 17 00:00:00 2001
From: DonVoo <donvoo@golddata.eu>
Date: Tue, 14 Jul 2026 19:08:43 +0200
Subject: [PATCH] Lazy-load mailbox previews

---
 backend/00-router.go | 42 +++++-------------------------------------
 1 file changed, 5 insertions(+), 37 deletions(-)

diff --git a/backend/00-router.go b/backend/00-router.go
index 31f805f..c402e60 100644
--- a/backend/00-router.go
+++ b/backend/00-router.go
@@ -403,7 +403,7 @@ func sourceMailboxMessagesHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	renderSourceMailboxMessageList(w, account, folder, headers)
-	fmt.Fprintf(w, `<div id="read" hx-swap-oob="innerHTML">%s</div>`, renderSourceMailboxRead(account, folder, firstHeaderUID(headers)))
+	fmt.Fprintf(w, `<div id="read" hx-swap-oob="innerHTML">%s</div>`, renderInitialReadPane(`<div class="ef-empty">Nachricht waehlen.</div>`))
 }
 
 func sourceMailboxMessageHandler(w http.ResponseWriter, r *http.Request) {
@@ -449,7 +449,7 @@ func targetMailboxMessagesHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	renderTargetMailboxMessageList(w, account, folder, headers)
-	fmt.Fprintf(w, `<div id="read" hx-swap-oob="innerHTML">%s</div>`, renderTargetMailboxRead(account, folder, firstHeaderUID(headers)))
+	fmt.Fprintf(w, `<div id="read" hx-swap-oob="innerHTML">%s</div>`, renderInitialReadPane(`<div class="ef-empty">Nachricht waehlen.</div>`))
 }
 
 func targetMailboxMessageHandler(w http.ResponseWriter, r *http.Request) {
@@ -994,7 +994,7 @@ func transferMessagesHandler(w http.ResponseWriter, r *http.Request) {
 	folder := strings.TrimSpace(r.URL.Query().Get("folder"))
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
 	fmt.Fprint(w, renderTransferMessageList(side, kind, value, folder))
-	fmt.Fprintf(w, `<div id="transfer-preview" hx-swap-oob="innerHTML">%s</div>`, renderTransferPreview(kind, value, folder, 0, 0))
+	fmt.Fprintf(w, `<div id="transfer-preview" hx-swap-oob="innerHTML">%s</div>`, renderEmptyPreviewPane("Nachricht links oder rechts waehlen."))
 }
 
 func transferMessageHandler(w http.ResponseWriter, r *http.Request) {
@@ -1173,16 +1173,6 @@ func renderInitialTransferList(side, kind string, accounts []Account, archives [
 }
 
 func renderInitialTransferPreview(leftKind, leftValue, rightKind, rightValue string) string {
-	if leftValue != "" {
-		if folder, err := firstTransferFolder(leftKind, leftValue); err == nil {
-			return renderTransferPreview(leftKind, leftValue, folder, 0, 0)
-		}
-	}
-	if rightValue != "" {
-		if folder, err := firstTransferFolder(rightKind, rightValue); err == nil {
-			return renderTransferPreview(rightKind, rightValue, folder, 0, 0)
-		}
-	}
 	return renderEmptyPreviewPane("Nachricht links oder rechts waehlen.")
 }
 
@@ -1563,18 +1553,7 @@ func renderInitialSourceMailboxList(account Account) string {
 }
 
 func renderInitialSourceMailboxRead(account Account) string {
-	if account.Name == "" {
-		return `<div class="ef-empty">Nachricht waehlen.</div>`
-	}
-	folder, err := firstSourceFolder(account)
-	if err != nil {
-		return `<div class="ef-empty">Nachricht waehlen.</div>`
-	}
-	headers, err := fetchSourceFolderHeaders(account, folder)
-	if err != nil {
-		return `<div class="ef-empty">Nachricht waehlen.</div>`
-	}
-	return renderSourceMailboxRead(account, folder, firstHeaderUID(headers))
+	return `<div class="ef-empty">Nachricht waehlen.</div>`
 }
 
 func firstSourceFolder(account Account) (string, error) {
@@ -1765,18 +1744,7 @@ func renderInitialTargetMailboxList(account Account) string {
 }
 
 func renderInitialTargetMailboxRead(account Account) string {
-	if account.Name == "" {
-		return `<div class="ef-empty">Nachricht waehlen.</div>`
-	}
-	folder, err := firstTargetFolder(account)
-	if err != nil {
-		return `<div class="ef-empty">Nachricht waehlen.</div>`
-	}
-	headers, err := fetchTargetFolderHeaders(account, folder)
-	if err != nil {
-		return `<div class="ef-empty">Nachricht waehlen.</div>`
-	}
-	return renderTargetMailboxRead(account, folder, firstHeaderUID(headers))
+	return `<div class="ef-empty">Nachricht waehlen.</div>`
 }
 
 func firstTargetFolder(account Account) (string, error) {