show all users on ranking board; be able to merge users

src/tera/admin/user.rs

@@ -306,6 +306,97 @@ async fn delete(db: &State<SqlitePool>, admin: ManageUserUser, user: i32) -> Fla
     }
 }
 
+use crate::model::user::merge::UserWithKm;
+
+#[get("/user/merge?<source>&<target>")]
+async fn merge_page(
+    db: &State<SqlitePool>,
+    admin: ManageUserUser,
+    flash: Option<FlashMessage<'_>>,
+    source: Option<i32>,
+    target: Option<i32>,
+) -> Template {
+    let users_with_km = UserWithKm::all(db).await;
+
+    let admin_user: User = admin.into_inner();
+
+    let mut context = Context::new();
+    if let Some(msg) = flash {
+        context.insert("flash", &msg.into_inner());
+    }
+    context.insert("users", &users_with_km);
+
+    // If both source and target are selected, show preview
+    if let (Some(source_id), Some(target_id)) = (source, target) {
+        if source_id != target_id {
+            if let (Some(source_user), Some(target_user)) = (
+                User::find_by_id(db, source_id).await,
+                User::find_by_id(db, target_id).await,
+            ) {
+                let preview = User::merge_preview(db, &source_user, &target_user).await;
+                context.insert("source_user", &source_user);
+                context.insert("target_user", &target_user);
+                context.insert("preview", &preview);
+            }
+        }
+    }
+
+    context.insert("selected_source", &source);
+    context.insert("selected_target", &target);
+    context.insert(
+        "loggedin_user",
+        &UserWithDetails::from_user(admin_user, db).await,
+    );
+
+    Template::render("admin/user/merge", context.into_json())
+}
+
+#[derive(FromForm, Debug)]
+pub struct MergeForm {
+    source_id: i32,
+    target_id: i32,
+}
+
+#[post("/user/merge", data = "<data>")]
+async fn merge_execute(
+    db: &State<SqlitePool>,
+    admin: ManageUserUser,
+    data: Form<MergeForm>,
+) -> Flash<Redirect> {
+    let Some(source_user) = User::find_by_id(db, data.source_id).await else {
+        return Flash::error(
+            Redirect::to("/admin/user/merge"),
+            format!("User mit ID {} existiert nicht", data.source_id),
+        );
+    };
+
+    let Some(target_user) = User::find_by_id(db, data.target_id).await else {
+        return Flash::error(
+            Redirect::to("/admin/user/merge"),
+            format!("Ziel-User mit ID {} existiert nicht", data.target_id),
+        );
+    };
+
+    let source_name = source_user.name.clone();
+
+    match User::merge_into(db, &source_user, &target_user, &admin).await {
+        Ok(()) => Flash::success(
+            Redirect::to(format!("/admin/user/{}", data.target_id)),
+            format!(
+                "Benutzer '{}' erfolgreich in '{}' zusammengeführt",
+                source_name, target_user.name
+            ),
+        ),
+        Err(e) => Flash::error(
+            Redirect::to(format!(
+                "/admin/user/merge?source={}&target={}",
+                data.source_id, data.target_id
+            )),
+            e,
+        ),
+    }
+}
+
 #[derive(FromForm, Debug)]
 pub struct MailUpdateForm {
     mail: String,
@@ -1437,6 +1528,9 @@ pub fn routes() -> Vec<Route> {
         view,
         resetpw,
         delete,
+        // Merge
+        merge_page,
+        merge_execute,
         fees,
         fees_paid,
         scheckbuch,