From 0197191f023af839e7aff956a67ffb5f93d724cc Mon Sep 17 00:00:00 2001
From: Alexander Bocken <alexander@bocken.org>
Date: Sat, 27 Dec 2025 14:14:29 +0100
Subject: [PATCH] add custom error page for recipe route with German fallback
 option

When an English recipe is not found, the error page now checks if a German
version exists and offers options to view it or edit/translate (if logged in).
---
 .../[name]/+error.svelte                      | 390 ++++++++++++++++++
 1 file changed, 390 insertions(+)
 create mode 100644 src/routes/[recipeLang=recipeLang]/[name]/+error.svelte

diff --git a/src/routes/[recipeLang=recipeLang]/[name]/+error.svelte b/src/routes/[recipeLang=recipeLang]/[name]/+error.svelte
new file mode 100644
index 0000000..58b76fe
--- /dev/null
+++ b/src/routes/[recipeLang=recipeLang]/[name]/+error.svelte
@@ -0,0 +1,390 @@
+<script lang="ts">
+  import { page } from '$app/stores';
+  import { goto } from '$app/navigation';
+  import { onMount } from 'svelte';
+
+  let status = $derived($page.status);
+  let error = $derived($page.error);
+  let recipeLang = $derived($page.params.recipeLang);
+  let recipeName = $derived($page.params.name);
+  let session = $derived($page.data?.session);
+  let user = $derived(session?.user);
+
+  // State to track if German recipe exists
+  let germanRecipeExists = $state(false);
+  let checkingGermanRecipe = $state(false);
+
+  // Check if German recipe exists when on English route with 404
+  onMount(async () => {
+    const isEnglishRoute = recipeLang === 'recipes';
+    if (isEnglishRoute && status === 404) {
+      checkingGermanRecipe = true;
+      try {
+        // Check if German recipe exists
+        const response = await fetch(`/api/rezepte/items/${recipeName}`);
+        germanRecipeExists = response.ok;
+      } catch (e) {
+        germanRecipeExists = false;
+      } finally {
+        checkingGermanRecipe = false;
+      }
+    }
+  });
+
+  function getErrorTitle(status: number) {
+    switch (status) {
+      case 401:
+        return 'Authentication Required';
+      case 403:
+        return 'Access Denied';
+      case 404:
+        return 'Recipe Not Found';
+      case 500:
+        return 'Server Error';
+      default:
+        return 'Error';
+    }
+  }
+
+  function getErrorDescription(status: number) {
+    const isEnglishRoute = recipeLang === 'recipes';
+
+    switch (status) {
+      case 401:
+        return 'You must be logged in to access this page.';
+      case 403:
+        return 'You do not have permission to access this area.';
+      case 404:
+        if (isEnglishRoute && germanRecipeExists) {
+          return 'This recipe has not been translated to English yet, but the German version is available.';
+        }
+        return 'The requested recipe could not be found.';
+      case 500:
+        return 'An unexpected error occurred. Please try again later.';
+      default:
+        return 'An unexpected error occurred.';
+    }
+  }
+
+  function getErrorIcon(status: number) {
+    switch (status) {
+      case 401:
+        return '🔐';
+      case 403:
+        return '🚫';
+      case 404:
+        return '🔍';
+      case 500:
+        return '⚠️';
+      default:
+        return '❌';
+    }
+  }
+
+  function viewGermanRecipe() {
+    goto(`/rezepte/${recipeName}`);
+  }
+
+  function editToTranslate() {
+    goto(`/rezepte/edit/${recipeName}`);
+  }
+
+  function goToRecipes() {
+    const lang = recipeLang === 'recipes' ? 'recipes' : 'rezepte';
+    goto(`/${lang}`);
+  }
+
+  function goBack() {
+    if (window.history.length > 1) {
+      window.history.back();
+    } else {
+      goToRecipes();
+    }
+  }
+
+  function login() {
+    goto('/login');
+  }
+</script>
+
+<svelte:head>
+  <title>{getErrorTitle(status)} - Alexander's Website</title>
+</svelte:head>
+
+<main class="error-page">
+  <div class="error-container">
+    <div class="error-icon">
+      {getErrorIcon(status)}
+    </div>
+
+    <h1 class="error-title">
+      {getErrorTitle(status)}
+    </h1>
+
+    <div class="error-code">
+      Error {status}
+    </div>
+
+    <p class="error-description">
+      {getErrorDescription(status)}
+    </p>
+
+    {#if error?.message && !checkingGermanRecipe}
+      <div class="error-details">
+        {error.message}
+      </div>
+    {/if}
+
+    {#if checkingGermanRecipe}
+      <div class="checking-message">
+        Checking for German version...
+      </div>
+    {/if}
+
+    <div class="error-actions">
+      {#if status === 401}
+        <button class="btn btn-primary" onclick={login}>
+          Log In
+        </button>
+        <button class="btn btn-secondary" onclick={goToRecipes}>
+          Go to Recipes
+        </button>
+      {:else if status === 404 && recipeLang === 'recipes' && germanRecipeExists && !checkingGermanRecipe}
+        <!-- Special case: English recipe not found but German exists -->
+        <button class="btn btn-primary" onclick={viewGermanRecipe}>
+          View German Recipe
+        </button>
+        {#if user}
+          <button class="btn btn-secondary" onclick={editToTranslate}>
+            Edit to Translate
+          </button>
+        {/if}
+        <button class="btn btn-secondary" onclick={goToRecipes}>
+          Go to Recipes
+        </button>
+      {:else if status === 404}
+        <button class="btn btn-primary" onclick={goToRecipes}>
+          Go to Recipes
+        </button>
+        <button class="btn btn-secondary" onclick={goBack}>
+          Go Back
+        </button>
+      {:else if status === 403}
+        <button class="btn btn-primary" onclick={goToRecipes}>
+          Go to Recipes
+        </button>
+        <button class="btn btn-secondary" onclick={goBack}>
+          Go Back
+        </button>
+      {:else if status === 500}
+        <button class="btn btn-primary" onclick={goToRecipes}>
+          Go to Recipes
+        </button>
+        <button class="btn btn-secondary" onclick={goBack}>
+          Try Again
+        </button>
+      {:else}
+        <button class="btn btn-primary" onclick={goToRecipes}>
+          Go to Recipes
+        </button>
+        <button class="btn btn-secondary" onclick={goBack}>
+          Go Back
+        </button>
+      {/if}
+    </div>
+  </div>
+</main>
+
+<style>
+  .error-page {
+    min-height: calc(100vh - 6rem);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    background: #fbf9f3;
+    padding: 2rem;
+  }
+
+  @media (prefers-color-scheme: dark) {
+    .error-page {
+      background: var(--background-dark);
+    }
+  }
+
+  .error-container {
+    background: var(--nord5);
+    border-radius: 1rem;
+    padding: 3rem;
+    max-width: 600px;
+    width: 100%;
+    text-align: center;
+    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
+    border: 1px solid var(--nord4);
+  }
+
+  @media (prefers-color-scheme: dark) {
+    .error-container {
+      background: var(--nord1);
+      border-color: var(--nord2);
+      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
+    }
+  }
+
+  .error-icon {
+    font-size: 4rem;
+    margin-bottom: 1.5rem;
+    opacity: 0.8;
+  }
+
+  .error-title {
+    font-size: 2.5rem;
+    color: var(--nord0);
+    margin-bottom: 0.5rem;
+    font-weight: 700;
+  }
+
+  @media (prefers-color-scheme: dark) {
+    .error-title {
+      color: var(--nord6);
+    }
+  }
+
+  .error-code {
+    font-size: 1.2rem;
+    color: var(--nord3);
+    font-weight: 600;
+    margin-bottom: 1.5rem;
+    opacity: 0.8;
+  }
+
+  @media (prefers-color-scheme: dark) {
+    .error-code {
+      color: var(--nord4);
+    }
+  }
+
+  .error-description {
+    font-size: 1.1rem;
+    color: var(--nord2);
+    margin-bottom: 1rem;
+    line-height: 1.6;
+  }
+
+  @media (prefers-color-scheme: dark) {
+    .error-description {
+      color: var(--nord5);
+    }
+  }
+
+  .error-details {
+    background: var(--nord4);
+    border-radius: 0.5rem;
+    padding: 1rem;
+    margin: 1.5rem 0;
+    font-size: 0.9rem;
+    color: var(--nord0);
+    border-left: 4px solid var(--blue);
+  }
+
+  @media (prefers-color-scheme: dark) {
+    .error-details {
+      background: var(--nord2);
+      color: var(--nord6);
+    }
+  }
+
+  .checking-message {
+    background: var(--nord4);
+    border-radius: 0.5rem;
+    padding: 1rem;
+    margin: 1.5rem 0;
+    font-size: 0.9rem;
+    color: var(--nord2);
+    font-style: italic;
+  }
+
+  @media (prefers-color-scheme: dark) {
+    .checking-message {
+      background: var(--nord2);
+      color: var(--nord4);
+    }
+  }
+
+  .error-actions {
+    display: flex;
+    gap: 1rem;
+    justify-content: center;
+    margin: 2rem 0;
+    flex-wrap: wrap;
+  }
+
+  .btn {
+    padding: 0.75rem 1.5rem;
+    border-radius: 0.5rem;
+    font-weight: 600;
+    text-decoration: none;
+    border: none;
+    cursor: pointer;
+    transition: all 0.2s ease;
+    font-size: 1rem;
+    display: inline-flex;
+    align-items: center;
+    gap: 0.5rem;
+  }
+
+  .btn-primary {
+    background: linear-gradient(135deg, var(--blue), var(--lightblue));
+    color: white;
+  }
+
+  .btn-primary:hover {
+    background: linear-gradient(135deg, var(--lightblue), var(--blue));
+    transform: translateY(-1px);
+    box-shadow: 0 4px 12px rgba(94, 129, 172, 0.3);
+  }
+
+  .btn-secondary {
+    background: var(--nord4);
+    color: var(--nord0);
+    border: 1px solid var(--nord3);
+  }
+
+  .btn-secondary:hover {
+    background: var(--nord3);
+    transform: translateY(-1px);
+    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
+  }
+
+  @media (prefers-color-scheme: dark) {
+    .btn-secondary {
+      background: var(--nord2);
+      color: var(--nord6);
+      border-color: var(--nord3);
+    }
+
+    .btn-secondary:hover {
+      background: var(--nord3);
+    }
+  }
+
+  @media (max-width: 600px) {
+    .error-container {
+      padding: 2rem;
+      margin: 1rem;
+    }
+
+    .error-title {
+      font-size: 2rem;
+    }
+
+    .error-actions {
+      flex-direction: column;
+      align-items: center;
+    }
+
+    .btn {
+      width: 100%;
+      max-width: 250px;
+    }
+  }
+</style>