1 files changed, 27 insertions, 7 deletions

diff --git a/src/SvgCollectionState.php b/src/SvgCollectionState.php
index 1bf8013..3de9c5b 100644
--- a/src/SvgCollectionState.php
+++ b/src/SvgCollectionState.php
@@ -7,6 +7,8 @@ use Illuminate\Cache\Repository;
 
 class SvgCollectionState
 {
+    protected int $createdAt;
+    protected ?string $hash;
     protected array $existing;
     protected array $pending;
     protected string $svg;
@@ -28,17 +30,17 @@ class SvgCollectionState
     {
         $data = $this->cache()->get($this->cacheKey());
         $this->svg = $data['svg'] ?? '';
-
-        $existing = $data['existing'] ?? [];
-        $pending = $data['pending'] ?? [];
-
-        $this->existing = static::arrayToMap($existing);
-        $this->pending = static::arrayToMap($pending);
+        $this->createdAt = $data['createdAt'] ?? time();
+        $this->existing = static::arrayToMap($data['existing'] ?? []);
+        $this->pending = static::arrayToMap($data['pending'] ?? []);
+        $this->hash = $data['hash'] ?? null;
     }
 
     public function push(): void
     {
         $data = [
+            'createdAt' => $this->createdAt,
+            'hash' => $this->hash,
             'existing' => array_values($this->existing),
             'pending' => array_values($this->pending),
             'svg' => $this->svg,
@@ -79,7 +81,7 @@ class SvgCollectionState
     {
         $this->existing = [
            ...$this->existing,
-           ...$svgs,
+           ...static::arrayToMap($svgs),
         ];
         if ($push) $this->push();
     }
@@ -119,6 +121,11 @@ class SvgCollectionState
         }
     }
 
+    public function clear(): void
+    {
+        $this->cache()->forget($this->cacheKey());
+    }
+
     protected function cache(): Repository
     {
         return Cache::store(config('svg.cache_store'));
@@ -129,4 +136,17 @@ class SvgCollectionState
         return SvgServiceProvider::NAMESPACE . '::' . $this->name;
     }
 
+    public function getHash(): ?string
+    {
+        return $this->hasPending() ? null : $this->hash;
+    }
+
+    public function updateHash(): void
+    {
+        $data = $this->existing;
+        sort($data);
+        $data[] = $this->createdAt;
+        $this->hash = substr(md5(json_encode($data)), 0, 10);
+    }
+
 }