refactor: migrate from Java HttpServer to Thorium framework

Replace com.sun.net.httpserver routing with Thorium's Server/Action/annotation
pattern. TaskController now owns @Get/@Post routes, form binding via data-mapping,
and the renderPage()/esc() helpers moved from Main. Main reduced to a 9-line
Thorium server entry point.

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

src/main/scala/Main.scala

@@ -1,162 +1,10 @@
-import com.sun.net.httpserver.{HttpExchange, HttpServer}
-import java.net.InetSocketAddress
-import java.net.URLDecoder
-import java.nio.charset.StandardCharsets
+import com.greenfossil.thorium.{*, given}
 
 object Main:
-
   def main(args: Array[String]): Unit =
     val port = sys.env.getOrElse("PORT", "8080").toInt
-    val server = HttpServer.create(InetSocketAddress(port), 0)
-
-    server.createContext("/health", exchange => {
-      val response = """{"status":"ok"}"""
-      exchange.getResponseHeaders.set("Content-Type", "application/json")
-      exchange.sendResponseHeaders(200, response.getBytes.length)
-      val os = exchange.getResponseBody
-      os.write(response.getBytes)
-      os.close()
-    })
-
-    server.createContext("/tasks", exchange => {
-      val method = exchange.getRequestMethod
-      val path = exchange.getRequestURI.getPath
-
-      (method, path) match
-        case ("POST", "/tasks") =>
-          val body = String(exchange.getRequestBody.readAllBytes(), StandardCharsets.UTF_8)
-          val title = parseFormField(body, "title")
-          TaskController.createTask(title)
-          redirect(exchange, "/")
-
-        case ("POST", p) if p.endsWith("/toggle") =>
-          val id = p.stripPrefix("/tasks/").stripSuffix("/toggle")
-          TaskController.toggleTask(id)
-          redirect(exchange, "/")
-
-        case ("POST", p) if p.endsWith("/delete") =>
-          val id = p.stripPrefix("/tasks/").stripSuffix("/delete")
-          TaskController.deleteTask(id)
-          redirect(exchange, "/")
-
-        case _ =>
-          exchange.sendResponseHeaders(404, -1)
-          exchange.close()
-    })
-
-    server.createContext("/", exchange => {
-      val path = exchange.getRequestURI.getPath
-      if path == "/" || path.isEmpty then
-        val html = renderPage()
-        exchange.getResponseHeaders.set("Content-Type", "text/html; charset=utf-8")
-        exchange.sendResponseHeaders(200, html.getBytes(StandardCharsets.UTF_8).length)
-        val os = exchange.getResponseBody
-        os.write(html.getBytes(StandardCharsets.UTF_8))
-        os.close()
-      else
-        exchange.sendResponseHeaders(404, -1)
-        exchange.close()
-    })
-
-    server.setExecutor(null)
-    server.start()
+    Server(port)
+      .addServices(TaskController)
+      .start()
     println(s"demoapp started on port $port")
     println(s"  app: ${SiteConfig.appName} v${SiteConfig.appVersion}")
-
-  private def redirect(exchange: HttpExchange, location: String): Unit =
-    exchange.getResponseHeaders.set("Location", location)
-    exchange.sendResponseHeaders(303, -1)
-    exchange.close()
-
-  private def parseFormField(body: String, field: String): String =
-    body.split("&").map(_.split("=", 2)).collectFirst {
-      case Array(k, v) if k == field =>
-        URLDecoder.decode(v, StandardCharsets.UTF_8)
-    }.getOrElse("")
-
-  private def esc(s: String): String =
-    s.replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")
-      .replace("\"", "&quot;").replace("'", "&#39;")
-
-  private def renderPage(): String =
-    val cfg = SiteConfig
-    val tasks = TaskStore.all()
-    val totalCount = tasks.size
-    val doneCount = tasks.count(_.completed)
-
-    val taskRows = tasks.map { t =>
-      val checkedClass = if t.completed then "line-through text-gray-400" else ""
-      val checkIcon = if t.completed then "&#10003;" else ""
-      s"""
-      <div class="flex items-center gap-3 p-3 rounded-lg hover:bg-gray-50 group transition-colors">
-        <form method="POST" action="/tasks/${t.id}/toggle" class="flex-none">
-          <button type="submit"
-            class="w-6 h-6 rounded-full border-2 ${if t.completed then "bg-emerald-500 border-emerald-500 text-white" else "border-gray-300 hover:border-teal-500"} flex items-center justify-center text-xs transition-colors">
-            $checkIcon
-          </button>
-        </form>
-        <span class="flex-1 $checkedClass">${esc(t.title)}</span>
-        <form method="POST" action="/tasks/${t.id}/delete" class="flex-none opacity-0 group-hover:opacity-100 transition-opacity">
-          <button type="submit" class="text-red-400 hover:text-red-600 text-sm px-2 py-1 rounded hover:bg-red-50 transition-colors">
-            Delete
-          </button>
-        </form>
-      </div>"""
-    }.mkString("\n")
-
-    s"""<!DOCTYPE html>
-<html lang="en">
-<head>
-  <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>${esc(cfg.appName)}</title>
-  <script src="https://cdn.tailwindcss.com"></script>
-  <link href="https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=DM+Sans:wght@400;500;700&display=swap" rel="stylesheet">
-  <style>
-    body { font-family: '${cfg.font}', sans-serif; font-size: ${cfg.fontSize}; }
-  </style>
-</head>
-<body class="bg-gray-50 min-h-screen">
-  <header style="background-color: ${cfg.bgColor};" class="shadow-lg">
-    <div class="max-w-2xl mx-auto px-6 py-5 flex items-center justify-between">
-      <h1 class="text-white text-2xl font-bold" style="font-family: 'Instrument Serif', serif;">
-        ${esc(cfg.appName)}
-      </h1>
-      <span class="text-white/70 text-sm font-mono">v${esc(cfg.appVersion)}</span>
-    </div>
-  </header>
-
-  <main class="max-w-2xl mx-auto px-6 py-8">
-    <div class="bg-white rounded-xl shadow-md p-6 mb-6">
-      <div class="flex items-center justify-between mb-4">
-        <h2 class="text-lg font-semibold text-gray-800">Tasks</h2>
-        <span class="text-sm text-gray-500">$doneCount / $totalCount completed</span>
-      </div>
-
-      <div class="space-y-1">
-        $taskRows
-        ${if tasks.isEmpty then """<p class="text-gray-400 text-center py-8">No tasks yet. Add one below!</p>""" else ""}
-      </div>
-    </div>
-
-    <div class="bg-white rounded-xl shadow-md p-6">
-      <h2 class="text-lg font-semibold text-gray-800 mb-4">Add Task</h2>
-      <form method="POST" action="/tasks" class="flex gap-3">
-        <input type="text" name="title" placeholder="What needs to be done?"
-          required
-          class="flex-1 border-2 border-gray-200 rounded-lg px-4 py-2 focus:border-teal-600 focus:ring-2 focus:ring-teal-600/10 outline-none transition-colors"
-          style="border-color: #E2E8F0;">
-        <button type="submit"
-          class="px-6 py-2 rounded-lg text-white font-medium hover:-translate-y-0.5 hover:shadow-lg transition-all duration-300"
-          style="background-color: ${cfg.bgColor};">
-          Add
-        </button>
-      </form>
-    </div>
-
-    <footer class="text-center text-gray-400 text-xs mt-8">
-      Powered by <span class="font-semibold">Clouderized</span> &middot; Thorium/Scala
-    </footer>
-  </main>
-</body>
-</html>"""

src/main/scala/TaskController.scala

@@ -1,14 +1,126 @@
+import com.greenfossil.thorium.{*, given}
+import com.greenfossil.data.mapping.{*, given}
+import com.linecorp.armeria.server.annotation.{Get, Post, Param}
 import java.util.UUID
 
 object TaskController:
 
-  def createTask(title: String): Unit =
-    if title.trim.nonEmpty then TaskStore.add(title)
+  private val titleForm = mapping[String]("title" -> text)
 
-  def toggleTask(id: String): Unit =
+  @Get("/health")
+  def health = Action: request =>
+    Ok("""{"status":"ok"}""").as("application/json")
+
+  @Get("/")
+  def index = Action: request =>
+    Ok(renderPage()).as("text/html; charset=utf-8")
+
+  @Post("/tasks")
+  def create = Action: implicit request =>
+    titleForm.bindFromRequest().fold(
+      _ => Redirect("/"),
+      title =>
+        if title.trim.nonEmpty then TaskStore.add(title)
+        Redirect("/")
+    )
+
+  @Post("/tasks/:id/toggle")
+  def toggle(@Param id: String) = Action: request =>
     try TaskStore.toggle(UUID.fromString(id))
     catch case _: IllegalArgumentException => ()
+    Redirect("/")
 
-  def deleteTask(id: String): Unit =
+  @Post("/tasks/:id/delete")
+  def delete(@Param id: String) = Action: request =>
     try TaskStore.delete(UUID.fromString(id))
     catch case _: IllegalArgumentException => ()
+    Redirect("/")
+
+  // ── rendering helpers (moved from Main) ──────────────────────────────────
+
+  private def esc(s: String): String =
+    s.replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")
+      .replace("\"", "&quot;").replace("'", "&#39;")
+
+  private def renderPage(): String =
+    val cfg = SiteConfig
+    val tasks = TaskStore.all()
+    val totalCount = tasks.size
+    val doneCount = tasks.count(_.completed)
+
+    val taskRows = tasks.map { t =>
+      val checkedClass = if t.completed then "line-through text-gray-400" else ""
+      val checkIcon = if t.completed then "&#10003;" else ""
+      s"""
+      <div class="flex items-center gap-3 p-3 rounded-lg hover:bg-gray-50 group transition-colors">
+        <form method="POST" action="/tasks/${t.id}/toggle" class="flex-none">
+          <button type="submit"
+            class="w-6 h-6 rounded-full border-2 ${if t.completed then "bg-emerald-500 border-emerald-500 text-white" else "border-gray-300 hover:border-teal-500"} flex items-center justify-center text-xs transition-colors">
+            $checkIcon
+          </button>
+        </form>
+        <span class="flex-1 $checkedClass">${esc(t.title)}</span>
+        <form method="POST" action="/tasks/${t.id}/delete" class="flex-none opacity-0 group-hover:opacity-100 transition-opacity">
+          <button type="submit" class="text-red-400 hover:text-red-600 text-sm px-2 py-1 rounded hover:bg-red-50 transition-colors">
+            Delete
+          </button>
+        </form>
+      </div>"""
+    }.mkString("\n")
+
+    s"""<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>${esc(cfg.appName)}</title>
+  <script src="https://cdn.tailwindcss.com"></script>
+  <link href="https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=DM+Sans:wght@400;500;700&display=swap" rel="stylesheet">
+  <style>
+    body { font-family: '${cfg.font}', sans-serif; font-size: ${cfg.fontSize}; }
+  </style>
+</head>
+<body class="bg-gray-50 min-h-screen">
+  <header style="background-color: ${cfg.bgColor};" class="shadow-lg">
+    <div class="max-w-2xl mx-auto px-6 py-5 flex items-center justify-between">
+      <h1 class="text-white text-2xl font-bold" style="font-family: 'Instrument Serif', serif;">
+        ${esc(cfg.appName)}
+      </h1>
+      <span class="text-white/70 text-sm font-mono">v${esc(cfg.appVersion)}</span>
+    </div>
+  </header>
+
+  <main class="max-w-2xl mx-auto px-6 py-8">
+    <div class="bg-white rounded-xl shadow-md p-6 mb-6">
+      <div class="flex items-center justify-between mb-4">
+        <h2 class="text-lg font-semibold text-gray-800">Tasks</h2>
+        <span class="text-sm text-gray-500">$doneCount / $totalCount completed</span>
+      </div>
+
+      <div class="space-y-1">
+        $taskRows
+        ${if tasks.isEmpty then """<p class="text-gray-400 text-center py-8">No tasks yet. Add one below!</p>""" else ""}
+      </div>
+    </div>
+
+    <div class="bg-white rounded-xl shadow-md p-6">
+      <h2 class="text-lg font-semibold text-gray-800 mb-4">Add Task</h2>
+      <form method="POST" action="/tasks" class="flex gap-3">
+        <input type="text" name="title" placeholder="What needs to be done?"
+          required
+          class="flex-1 border-2 border-gray-200 rounded-lg px-4 py-2 focus:border-teal-600 focus:ring-2 focus:ring-teal-600/10 outline-none transition-colors"
+          style="border-color: #E2E8F0;">
+        <button type="submit"
+          class="px-6 py-2 rounded-lg text-white font-medium hover:-translate-y-0.5 hover:shadow-lg transition-all duration-300"
+          style="background-color: ${cfg.bgColor};">
+          Add
+        </button>
+      </form>
+    </div>
+
+    <footer class="text-center text-gray-400 text-xs mt-8">
+      Powered by <span class="font-semibold">Clouderized</span> &middot; Thorium/Scala
+    </footer>
+  </main>
+</body>
+</html>"""