feat: improve stack trace rendering

src/Framework/ExceptionHandling/Renderers/ConsoleErrorRenderer.php

@@ -55,18 +55,28 @@ final readonly class ConsoleErrorRenderer implements ErrorRenderer
             ConsoleColor::RED
         );
 
-        if ($exception->getPrevious()) {
+        $previous = $exception->getPrevious();
+        while ($previous !== null) {
             $this->output->writeErrorLine(
-                "   Caused by: " . $exception->getPrevious()->getMessage(),
+                "   Caused by: " . get_class($previous) . ": " . $previous->getMessage(),
                 ConsoleColor::YELLOW
             );
+            $previous = $previous->getPrevious();
         }
 
         $this->output->writeErrorLine("   Stack trace:", ConsoleColor::GRAY);
         $stackTrace = StackTrace::fromThrowable($exception);
-        foreach ($stackTrace->getItems() as $index => $item) {
+        $items = $stackTrace->getItems();
-            $formattedLine = $this->formatStackTraceLine($index, $item);
+        $indexWidth = strlen((string) max(count($items) - 1, 0));
-            $this->output->writeErrorLine("     " . $formattedLine, ConsoleColor::GRAY);
+
+        foreach ($items as $index => $item) {
+            $formattedLine = $this->formatStackTraceLine($index, $item, $indexWidth);
+            $color = $item->isVendorFrame() ? ConsoleColor::GRAY : ConsoleColor::WHITE;
+            if ($index === 0) {
+                $color = ConsoleColor::BRIGHT_WHITE;
+            }
+
+            $this->output->writeErrorLine("     " . $formattedLine, $color);
         }
 
         // Context information if available
@@ -110,9 +120,10 @@ final readonly class ConsoleErrorRenderer implements ErrorRenderer
     /**
      * Format stack trace line with clickable file links
      */
-    private function formatStackTraceLine(int $index, \App\Framework\ExceptionHandling\ValueObjects\StackItem $item): string
+    private function formatStackTraceLine(int $index, \App\Framework\ExceptionHandling\ValueObjects\StackItem $item, int $indexWidth): string
     {
-        $baseFormat = sprintf('#%d %s', $index, $item->formatForDisplay());
+        $indexLabel = str_pad((string) $index, $indexWidth, ' ', STR_PAD_LEFT);
+        $baseFormat = sprintf('#%s %s', $indexLabel, $item->formatForDisplay());
         
         // If PhpStorm is detected, replace file:line with clickable link
         if (!$this->isPhpStorm()) {

src/Framework/ExceptionHandling/Renderers/ResponseErrorRenderer.php

@@ -69,6 +69,7 @@ final readonly class ResponseErrorRenderer implements ErrorRenderer
         ?ExceptionContextProvider $contextProvider
     ): HttpResponse {
         $statusCode = $this->getHttpStatusCode($exception);
+        $stackTrace = StackTrace::fromThrowable($exception);
 
         // Get user-friendly message if translator is available
         $context = $contextProvider?->get($exception);
@@ -98,7 +99,8 @@ final readonly class ResponseErrorRenderer implements ErrorRenderer
         if ($this->isDebugMode) {
             $errorData['error']['file'] = $exception->getFile();
             $errorData['error']['line'] = $exception->getLine();
-            $errorData['error']['trace'] = StackTrace::fromThrowable($exception)->toArray();
+            $errorData['error']['trace'] = $stackTrace->toArray();
+            $errorData['error']['trace_short'] = $stackTrace->formatShort();
 
             // Add context from WeakMap if available
             if ($contextProvider !== null) {
@@ -236,6 +238,8 @@ final readonly class ResponseErrorRenderer implements ErrorRenderer
                 'file' => $exception->getFile(),
                 'line' => $exception->getLine(),
                 'trace' => $stackTrace->formatForHtml(),
+                'trace_short' => $stackTrace->formatShort(),
+                'trace_frames' => $stackTrace->toArray(),
             ];
 
             // Add context from WeakMap if available
@@ -332,6 +336,65 @@ final readonly class ResponseErrorRenderer implements ErrorRenderer
             font-weight: bold;
             color: #666;
         }
+        .stack-trace {
+            margin-top: 1rem;
+        }
+        .stack-trace__header {
+            display: flex;
+            align-items: center;
+            gap: 1rem;
+        }
+        .stack-trace__list {
+            margin-top: 0.5rem;
+            border: 1px solid #e1e3e6;
+            border-radius: 6px;
+            background: #fff;
+        }
+        .stack-frame {
+            border-bottom: 1px solid #f0f0f0;
+            padding: 0.5rem 0.75rem;
+        }
+        .stack-frame:last-child {
+            border-bottom: none;
+        }
+        .stack-frame__index {
+            display: inline-block;
+            min-width: 32px;
+            color: #666;
+        }
+        .stack-frame__call {
+            font-weight: 600;
+        }
+        .stack-frame__location {
+            color: #666;
+            margin-left: 0.5rem;
+        }
+        .stack-frame__code {
+            margin-top: 0.5rem;
+        }
+        .stack-frame[open] summary {
+            font-weight: 600;
+        }
+        .stack-frame summary {
+            list-style: none;
+            cursor: pointer;
+        }
+        .stack-frame summary::-webkit-details-marker { display:none; }
+        .stack-frame--vendor {
+            opacity: 0.8;
+            background: #fafbfc;
+        }
+        .btn-copy {
+            border: 1px solid #d0d4da;
+            background: #fff;
+            padding: 0.25rem 0.75rem;
+            border-radius: 4px;
+            cursor: pointer;
+            font-family: inherit;
+        }
+        .btn-copy:hover {
+            background: #eef1f5;
+        }
     </style>
 </head>
 <body>
@@ -360,6 +423,9 @@ HTML;
         $line = $exception->getLine();
         $stackTrace = StackTrace::fromThrowable($exception);
         $trace = $stackTrace->formatForHtml(); // Already HTML-encoded in formatForHtml
+        $traceShort = htmlspecialchars($stackTrace->formatShort(), ENT_QUOTES | ENT_HTML5, 'UTF-8');
+        $tracePlain = htmlspecialchars($stackTrace->formatForConsole(), ENT_QUOTES | ENT_HTML5, 'UTF-8');
+        $renderedFrames = $this->renderStackTraceList($stackTrace);
 
         $contextHtml = '';
         if ($contextProvider !== null) {
@@ -399,11 +465,41 @@ HTML;
     <div class="context-item">
         <span class="context-label">File:</span> {$file}:{$line}
     </div>
+    <div class="context-item">
+        <span class="context-label">Short trace:</span> {$traceShort}
+    </div>
     {$contextHtml}
     {$codeSnippet}
-    <h4>Stack Trace:</h4>
+    <div class="stack-trace">
-    <pre>{$trace}</pre>
+        <div class="stack-trace__header">
+            <h4 style="margin: 0;">Stack Trace</h4>
+            <button type="button" class="btn-copy" data-copy-target="full-trace-text">Copy stack</button>
+        </div>
+        <div class="stack-trace__list">
+            {$renderedFrames}
+        </div>
+        <pre id="full-trace-text" class="stack-trace__raw" aria-label="Stack trace">{$trace}</pre>
+        <pre id="full-trace-plain" style="display:none">{$tracePlain}</pre>
+    </div>
 </div>
+<script>
+document.addEventListener('DOMContentLoaded', function () {
+    const btn = document.querySelector('[data-copy-target="full-trace-text"]');
+    if (!btn) return;
+    btn.addEventListener('click', async function () {
+        const raw = document.getElementById('full-trace-plain');
+        if (!raw) return;
+        try {
+            await navigator.clipboard.writeText(raw.textContent || '');
+            btn.textContent = 'Copied';
+            setTimeout(() => btn.textContent = 'Copy stack', 1200);
+        } catch (e) {
+            btn.textContent = 'Copy failed';
+            setTimeout(() => btn.textContent = 'Copy stack', 1200);
+        }
+    });
+});
+</script>
 HTML;
     }
 
@@ -512,4 +608,33 @@ HTML;
             return '';
         }
     }
+
+    private function renderStackTraceList(StackTrace $stackTrace): string
+    {
+        $frames = [];
+        foreach ($stackTrace->getItems() as $index => $item) {
+            $call = $item->getCall() !== '' ? $item->getCall() : '{main}';
+            $callEscaped = htmlspecialchars($call, ENT_QUOTES | ENT_HTML5, 'UTF-8');
+            $locationEscaped = htmlspecialchars($item->getShortFile() . ':' . $item->line, ENT_QUOTES | ENT_HTML5, 'UTF-8');
+            $isVendor = $item->isVendorFrame();
+            $expanded = !$isVendor && $index < 3;
+            $codeSnippet = '';
+
+            if (!$isVendor && $index < 3) {
+                $codeSnippet = $this->getCodeSnippet($item->file, $item->line);
+            }
+
+            $frames[] = sprintf(
+                '<details class="stack-frame%s"%s><summary><span class="stack-frame__index">#%d</span> <span class="stack-frame__call">%s</span> <span class="stack-frame__location">%s</span></summary>%s</details>',
+                $isVendor ? ' stack-frame--vendor' : '',
+                $expanded ? ' open' : '',
+                $index,
+                $callEscaped,
+                $locationEscaped,
+                $codeSnippet !== '' ? '<div class="stack-frame__code">' . $codeSnippet . '</div>' : ''
+            );
+        }
+
+        return implode("\n", $frames);
+    }
 }

src/Framework/ExceptionHandling/ValueObjects/StackItem.php

@@ -12,6 +12,10 @@ namespace App\Framework\ExceptionHandling\ValueObjects;
  */
 final readonly class StackItem
 {
+    private const MAX_STRING_LENGTH = 80;
+    private const MAX_ARGS = 6;
+    private const MAX_PARAMS_LENGTH = 200;
+
     public function __construct(
         public string $file,
         public int $line,
@@ -166,7 +170,7 @@ final readonly class StackItem
      */
     public function getShortFile(): string
     {
-        $projectRoot = dirname(__DIR__, 4); // Von src/Framework/ExceptionHandling/ValueObjects nach root
+        $projectRoot = self::projectRoot();
 
         if (str_starts_with($this->file, $projectRoot)) {
             return substr($this->file, strlen($projectRoot) + 1);
@@ -175,6 +179,17 @@ final readonly class StackItem
         return $this->file;
     }
 
+    /**
+     * True wenn Frame im vendor/ Verzeichnis liegt
+     */
+    public function isVendorFrame(): bool
+    {
+        $projectRoot = self::projectRoot();
+        $vendorPath = $projectRoot . DIRECTORY_SEPARATOR . 'vendor' . DIRECTORY_SEPARATOR;
+
+        return str_starts_with($this->file, $vendorPath);
+    }
+
     /**
      * Gibt vollständigen Method/Function Call zurück (ohne Namespace)
      */
@@ -200,15 +215,28 @@ final readonly class StackItem
     /**
      * Formatiert Parameter für Display (kompakte Darstellung)
      */
-    public function formatParameters(): string
+    public function formatParameters(int $maxArgs = self::MAX_ARGS, int $maxTotalLength = self::MAX_PARAMS_LENGTH): string
     {
         if (empty($this->args)) {
             return '';
         }
 
         $formatted = [];
-        foreach ($this->args as $arg) {
+        $length = 0;
-            $formatted[] = $this->formatParameterForDisplay($arg);
+        foreach ($this->args as $index => $arg) {
+            if ($index >= $maxArgs) {
+                $formatted[] = '…';
+                break;
+            }
+
+            $param = $this->formatParameterForDisplay($arg);
+            $length += strlen($param);
+            $formatted[] = $param;
+
+            if ($length > $maxTotalLength) {
+                $formatted[] = '…';
+                break;
+            }
         }
 
         return implode(', ', $formatted);
@@ -266,8 +294,8 @@ final readonly class StackItem
         }
 
         // Lange Strings kürzen
-        if (strlen($value) > 50) {
+        if (strlen($value) > self::MAX_STRING_LENGTH) {
-            return sprintf("'%s...'", substr($value, 0, 50));
+            return sprintf("'%s...'", substr($value, 0, self::MAX_STRING_LENGTH));
         }
 
         return sprintf("'%s'", $value);
@@ -349,6 +377,16 @@ final readonly class StackItem
         return end($parts);
     }
 
+    /**
+     * Kurzform für kompaktes Logging / JSON
+     */
+    public function formatShort(): string
+    {
+        $call = $this->getCall() !== '' ? $this->getCall() : '{main}';
+
+        return sprintf('%s @ %s:%d', $call, $this->getShortFile(), $this->line);
+    }
+
     /**
      * Formatiert für Display (HTML/Console)
      * Verwendet Standard PHP Stack Trace Format: ClassName->methodName($param1, $param2, ...) in file.php:line
@@ -437,5 +475,15 @@ final readonly class StackItem
             default => $value,
         };
     }
-}
 
+    private static function projectRoot(): string
+    {
+        static $projectRoot = null;
+        if ($projectRoot !== null) {
+            return $projectRoot;
+        }
+
+        $projectRoot = dirname(__DIR__, 4);
+        return $projectRoot;
+    }
+}

src/Framework/ExceptionHandling/ValueObjects/StackTrace.php

@@ -39,6 +39,21 @@ final readonly class StackTrace implements IteratorAggregate, Countable
         return new self($items);
     }
 
+    /**
+     * Liefert nur App-Frames (keine vendor Frames)
+     */
+    public function appFrames(): self
+    {
+        return new self(
+            array_values(
+                array_filter(
+                    $this->items,
+                    fn(StackItem $item) => !$item->isVendorFrame()
+                )
+            )
+        );
+    }
+
     /**
      * Begrenzt Anzahl der Frames
      */
@@ -82,6 +97,24 @@ final readonly class StackTrace implements IteratorAggregate, Countable
         return implode("\n", $lines);
     }
 
+    /**
+     * Kompakte, einzeilige Darstellung für Logs/JSON
+     */
+    public function formatShort(int $maxFrames = 5): string
+    {
+        $frames = array_slice($this->items, 0, $maxFrames);
+        $formatted = array_map(
+            fn(StackItem $item) => $item->formatShort(),
+            $frames
+        );
+
+        $suffix = count($this->items) > $maxFrames
+            ? sprintf(' … +%d frames', count($this->items) - $maxFrames)
+            : '';
+
+        return implode(' | ', $formatted) . $suffix;
+    }
+
     /**
      * Konvertiert zu Array für JSON-Serialisierung
      *