feat(komga-tray): display dialog with error detail on application startup failure

Closes: #1336

komga-tray/build.gradle.kts

@@ -32,7 +32,7 @@ tasks {
 dependencies {
   implementation(project(":komga"))
 
-  implementation(compose.desktop.common)
+  implementation(compose.desktop.currentOs)
 
   linuxAmd64(compose.desktop.linux_x64)
   macAmd64(compose.desktop.macos_x64)

komga-tray/src/main/kotlin/org/gotson/komga/DesktopApplication.kt

@@ -1,7 +1,10 @@
 package org.gotson.komga
 
+import org.gotson.komga.application.gui.showErrorDialog
 import org.gotson.komga.infrastructure.util.checkTempDirectory
 import org.springframework.boot.builder.SpringApplicationBuilder
+import org.springframework.boot.web.server.PortInUseException
+import org.springframework.context.ApplicationContextException
 import org.springframework.scheduling.annotation.EnableAsync
 
 @EnableAsync
@@ -14,8 +17,17 @@ fun main(args: Array<String>) {
   System.setProperty("org.jooq.no-logo", "true")
   System.setProperty("org.jooq.no-tips", "true")
 
-  SpringApplicationBuilder(DesktopApplication::class.java).apply {
-    headless(false)
-    run(*args)
+  try {
+    SpringApplicationBuilder(DesktopApplication::class.java).apply {
+      headless(false)
+      run(*args)
+    }
+  } catch (e: ApplicationContextException) {
+    val (message, stackTrace) = when (e.cause) {
+      is PortInUseException -> RB.getString("error_message.port_in_use", (e.cause as PortInUseException).port) to null
+      else -> RB.getString("error_message.unexpected") to e.stackTraceToString()
+    }
+
+    showErrorDialog(message, stackTrace)
   }
 }

komga-tray/src/main/kotlin/org/gotson/komga/application/gui/ErrorDialog.kt

@@ -0,0 +1,104 @@
+package org.gotson.komga.application.gui
+
+import androidx.compose.desktop.ui.tooling.preview.Preview
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.material.Button
+import androidx.compose.material.Text
+import androidx.compose.material.TextButton
+import androidx.compose.material.TextField
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalClipboardManager
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.res.loadSvgPainter
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.Window
+import androidx.compose.ui.window.WindowPlacement
+import androidx.compose.ui.window.WindowPosition
+import androidx.compose.ui.window.WindowState
+import androidx.compose.ui.window.application
+import org.gotson.komga.RB
+import org.springframework.core.io.ClassPathResource
+
+@Preview
+fun showErrorDialog(text: String, stackTrace: String? = null) {
+  application {
+    Window(
+      title = RB.getString("dialog_error.title"),
+      onCloseRequest = ::exitApplication,
+      visible = true,
+      resizable = false,
+      state = WindowState(
+        placement = WindowPlacement.Floating,
+        position = WindowPosition(alignment = Alignment.Center),
+        size = DpSize(
+          if (stackTrace != null) 800.dp else Dp.Unspecified,
+          Dp.Unspecified,
+        ),
+      ),
+      icon = loadSvgPainter(ClassPathResource("icons/komga-color.svg").inputStream, LocalDensity.current),
+    ) {
+      Column(
+        modifier = Modifier.padding(16.dp),
+      ) {
+        Row(
+          verticalAlignment = Alignment.CenterVertically,
+          modifier = Modifier.padding(bottom = 16.dp),
+        ) {
+          Image(
+            painter = loadSvgPainter(ClassPathResource("icons/komga-color.svg").inputStream, LocalDensity.current),
+            contentDescription = "Komga logo",
+            modifier = Modifier
+              .size(96.dp)
+              .align(Alignment.Top),
+          )
+          Text(
+            text,
+            modifier = Modifier.padding(start = 32.dp),
+          )
+        }
+        if (stackTrace != null)
+          TextField(
+            value = stackTrace,
+            onValueChange = {},
+            singleLine = false,
+            maxLines = 15,
+            modifier = Modifier.fillMaxWidth(),
+          )
+
+        Row(
+          horizontalArrangement = if (stackTrace != null) Arrangement.SpaceBetween else Arrangement.End,
+          modifier = if (stackTrace != null)
+            Modifier.align(Alignment.End).fillMaxWidth()
+          else
+            Modifier.align(Alignment.End),
+        ) {
+          if (stackTrace != null) {
+            val clipboardManager = LocalClipboardManager.current
+            TextButton(
+              onClick = {
+                clipboardManager.setText(AnnotatedString(stackTrace))
+              },
+            ) {
+              Text(RB.getString("dialog_error.copy_clipboard"))
+            }
+          }
+          Button(
+            onClick = { exitApplication() },
+          ) {
+            Text(RB.getString("dialog_error.close"))
+          }
+        }
+      }
+    }
+  }
+}

komga-tray/src/main/resources/org/gotson/komga/messages.properties

@@ -1,3 +1,8 @@
+dialog_error.close=Close
+dialog_error.copy_clipboard=Copy to clipboard
+dialog_error.title=Komga failed to start
+error_message.port_in_use=Port {} is already in use.\nKomga is probably already running.\nCheck the tray icon or menu bar for the Komga icon.
+error_message.unexpected=An unexpected error occurred.
 menu.open_komga=Open Komga
 menu.quit=Quit Komga
 menu.show_conf_dir=Open configuration directory