first commit

app/Rules/UniqueTeamInvitation.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Rules;
+
+use App\Models\Team;
+use App\Models\TeamInvitation;
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Translation\PotentiallyTranslatedString;
+
+class UniqueTeamInvitation implements ValidationRule
+{
+    public function __construct(protected Team $team)
+    {
+        //
+    }
+
+    /**
+     * Run the validation rule.
+     *
+     * @param  Closure(string, ?string=): PotentiallyTranslatedString  $fail
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        $email = strtolower($value);
+
+        $isMember = $this->team->members()
+            ->whereRaw('LOWER(email) = ?', [$email])
+            ->exists();
+
+        if ($isMember) {
+            $fail(__('This user is already a member of the team.'));
+
+            return;
+        }
+
+        $hasPendingInvitation = TeamInvitation::where('team_id', $this->team->id)
+            ->whereRaw('LOWER(email) = ?', [$email])
+            ->whereNull('accepted_at')
+            ->where(function ($query) {
+                $query->whereNull('expires_at')
+                    ->orWhere('expires_at', '>', now());
+            })
+            ->exists();
+
+        if ($hasPendingInvitation) {
+            $fail(__('An invitation has already been sent to this email address.'));
+        }
+    }
+}