fix: 优化指引页面复制与流程图布局

app/Filament/Resources/GuideResource/Pages/ManageGuidePages.php

@@ -51,6 +51,18 @@ class ManageGuidePages extends Page
             }
         }
 
+        $pageMap = $pages->keyBy('id');
+        $incomingEdges = [];
+        $outgoingEdges = [];
+        foreach ($pages as $p) {
+            $incomingEdges[$p->id] = [];
+            $outgoingEdges[$p->id] = [];
+        }
+        foreach ($edgeModels as $e) {
+            $incomingEdges[$e->to_page_id][] = $e;
+            $outgoingEdges[$e->from_page_id][] = $e;
+        }
+
         // BFS from entry nodes (no incoming edges) to assign levels
         $hasIncoming = array_flip($edgeModels->pluck('to_page_id')->toArray());
         $levels = [];
@@ -91,11 +103,80 @@ class ManageGuidePages extends Page
         }
         ksort($levelGroups);
 
+        $orders = [];
+        foreach ($levelGroups as $ids) {
+            foreach (array_values($ids) as $index => $id) {
+                $orders[$id] = $index;
+            }
+        }
+
+        $edgeOffset = function (GuidePageEdge $edge) use ($pageMap): float {
+            $page = $pageMap->get($edge->from_page_id);
+            $options = $page?->options ?? [];
+            $index = $edge->label === null ? false : array_search($edge->label, $options, true);
+
+            return $index === false ? 0 : (($index + 1) / (count($options) + 1)) * 0.4;
+        };
+
+        $incomingScore = function (int $id) use (&$orders, $incomingEdges, $levels, $edgeOffset): ?float {
+            $scores = [];
+            foreach ($incomingEdges[$id] ?? [] as $edge) {
+                if (($levels[$edge->from_page_id] ?? null) >= ($levels[$id] ?? null)) {
+                    continue;
+                }
+                $scores[] = ($orders[$edge->from_page_id] ?? 0) + $edgeOffset($edge);
+            }
+
+            return empty($scores) ? null : array_sum($scores) / count($scores);
+        };
+
+        $outgoingScore = function (int $id) use (&$orders, $outgoingEdges, $levels): ?float {
+            $scores = [];
+            foreach ($outgoingEdges[$id] ?? [] as $edge) {
+                if (($levels[$edge->to_page_id] ?? null) <= ($levels[$id] ?? null)) {
+                    continue;
+                }
+                $scores[] = $orders[$edge->to_page_id] ?? 0;
+            }
+
+            return empty($scores) ? null : array_sum($scores) / count($scores);
+        };
+
+        $sortLevel = function (array &$ids, callable $scoreResolver) use (&$orders): void {
+            usort($ids, function (int $a, int $b) use ($scoreResolver, $orders): int {
+                $scoreA = $scoreResolver($a) ?? ($orders[$a] ?? 0);
+                $scoreB = $scoreResolver($b) ?? ($orders[$b] ?? 0);
+
+                return $scoreA <=> $scoreB ?: ($orders[$a] ?? 0) <=> ($orders[$b] ?? 0) ?: $a <=> $b;
+            });
+
+            foreach ($ids as $index => $id) {
+                $orders[$id] = $index;
+            }
+        };
+
+        for ($i = 0; $i < 3; $i++) {
+            foreach ($levelGroups as $level => &$ids) {
+                if ($level === array_key_first($levelGroups)) {
+                    continue;
+                }
+                $sortLevel($ids, $incomingScore);
+            }
+            unset($ids);
+
+            foreach (array_reverse(array_keys($levelGroups)) as $level) {
+                if ($level === array_key_last($levelGroups)) {
+                    continue;
+                }
+                $sortLevel($levelGroups[$level], $outgoingScore);
+            }
+        }
+
         // Compute positions: center each level vertically, stack horizontally (left-to-right)
         $nodeWidth  = 180;  // matches CSS max-width
         $nodeHeight = 80;   // compact node height
         $gapX = 110;        // horizontal gap between levels
-        $gapY = 30;         // vertical gap within same level
+        $gapY = 60;         // vertical gap within same level
         $positions = [];
 
         foreach ($levelGroups as $level => $ids) {
@@ -229,6 +310,29 @@ class ManageGuidePages extends Page
             });
     }
 
+    public function copyPageAction(): Action
+    {
+        return Action::make('copyPage')
+            ->label('复制页面')
+            ->icon('heroicon-o-document-duplicate')
+            ->requiresConfirmation()
+            ->modalHeading('复制页面')
+            ->modalDescription('确认复制该页面？复制后会生成一个独立的新页面，不会复制连线关系。')
+            ->modalSubmitActionLabel('确认复制')
+            ->action(function (array $arguments): void {
+                $page = $this->getRecord()->pages()->findOrFail($arguments['id']);
+
+                $this->getRecord()->pages()->create([
+                    'title' => $page->title.' - 副本',
+                    'content' => $page->content,
+                    'options' => $page->options ?? [],
+                ]);
+
+                $this->loadGraph();
+                $this->dispatchGraphUpdated();
+            });
+    }
+
     public function deletePageAction(): Action
     {
         return Action::make('deletePage')