@php
    $partnerName  = $partner->partner_name  ?? ($conversation->student_name  ?? 'User');
    $partnerRole  = $partner->partner_role  ?? ($conversation->partner_type  ?? 'student');
    $partnerId    = $partner->partner_id    ?? ($conversation->partner_id    ?? null);
    $partnerPhoto = $partner->student_photo ?? ($conversation->student_photo ?? null);
    $teacherName  = $teacherInfo->name ?? null;
    
    // FIX: Dynamically resolve any non-admin, non-student sender names 
    // from school_staff table. This handles teachers who sent messages
    // but are not registered in conversation participants.
    $senderNameMap = [];
    $otherSenderIds = $messages->where('sender_id', '!=', Auth::id())
        ->where('sender_id', '!=', $partnerId)
        ->pluck('sender_id')
        ->unique()
        ->filter()
        ->values()
        ->all();
        
     if (!empty($otherSenderIds)) {
     // ✅ FIX: fetch name + REAL designation (dynamic, never hardcoded)
     $staffRows = DB::table('school_staff')
         ->whereIn('id', $otherSenderIds)
         ->get();
     foreach ($staffRows as $row) {
         $senderNameMap[$row->id]        = $row->staff_name;
         $senderDesignationMap[$row->id] = strtoupper(trim($row->designation ?? ''));
     }
     foreach ($otherSenderIds as $sid) {
         if (!isset($senderNameMap[$sid])) $senderNameMap[$sid] = 'User';
     }
 }
@endphp

@foreach($messages as $msg)
    @php
        $isAdmin = ($msg->sender_id == Auth::id());

            if ($isAdmin) {
            $senderName  = 'Admin';
            $senderRole  = 'admin';
            $senderPhoto = null;
            $senderDesignation = '';
        } elseif ($partnerId !== null && $msg->sender_id == $partnerId && $partnerRole == 'student') {
            // Student chat: sender ID matches student participant
            $senderName  = $partnerName;
            $senderRole  = 'student';
            $senderPhoto = $partnerPhoto;
            $senderDesignation = '';
        } elseif (($partnerRole == 'teacher' || $partnerRole == 'staff') && $partnerId !== null && $msg->sender_id == $partnerId) {
            // Teacher↔Admin chat: sender is the partner teacher himself
            $senderName  = $partnerName;
            $senderRole  = 'teacher';
            $senderPhoto = null;
            $senderDesignation = 'TEACHER';
        } elseif (isset($senderNameMap[$msg->sender_id])) {
            // ✅ FIX: any other staff sender (e.g. PRINCIPAL) resolved dynamically with REAL designation
            $senderName  = $senderNameMap[$msg->sender_id];
            $senderDesignation = $senderDesignationMap[$msg->sender_id] ?? 'TEACHER';
            $senderRole  = ($senderDesignation === 'PRINCIPAL') ? 'principal' : 'teacher';
            $senderPhoto = null;
        } elseif ($teacherName) {
            // Fallback to pre-fetched teacher name
            $senderName  = $teacherName;
            $senderRole  = 'teacher';
            $senderPhoto = null;
            $senderDesignation = 'TEACHER';
        } else {
            $senderName  = 'User';
            $senderRole  = 'unknown';
            $senderPhoto = null;
            $senderDesignation = '';
        }
        $senderInitial = substr($senderName, 0, 1);
        $isStudent = ($senderRole == 'student');
        $isTeacher = ($senderRole == 'teacher');
        $isPrincipalSender = ($senderRole == 'principal');
        $roleLabel = $isStudent ? 'Student' : ($isPrincipalSender ? 'Principal' : 'Teacher');

        $bubbleClass = $isAdmin
            ? 'rounded-tr-none bg-indigo-600 text-white shadow-md'
            : ($isStudent
                ? 'rounded-tl-none bg-emerald-50 border border-emerald-200 shadow-sm text-slate-700'
                : 'rounded-tl-none bg-amber-50 border border-amber-200 shadow-sm text-slate-700');

        $avatarClass = $isStudent
            ? 'bg-emerald-100 text-emerald-600 border-emerald-200'
            : 'bg-amber-100 text-amber-600 border-amber-200';

        $roleLabelClass = $isStudent ? 'text-emerald-600' : 'text-amber-600';
        $timeClass = $isAdmin ? 'text-indigo-200' : 'text-slate-400';
    @endphp

    <div class="message-bubble flex {{ $isAdmin ? 'justify-end' : 'justify-start' }} mb-4">
        @if(!$isAdmin)
            <div class="flex flex-col items-center self-end mr-2.5 mb-1 shrink-0">
                <div class="w-8 h-8 rounded-full overflow-hidden {{ $avatarClass }} flex items-center justify-center text-xs font-bold border">
                    @if($senderPhoto)
                        <img src="{{ asset('storage/'.$senderPhoto) }}" class="w-full h-full object-cover" onerror="this.parentElement.innerHTML='{{ $senderInitial }}'">
                    @else
                        {{ $senderInitial }}
                    @endif
                </div>
                <span class="text-[9px] {{ $roleLabelClass }} font-bold mt-0.5 uppercase tracking-wider">
                 {{ $roleLabel }}
             </span>
            </div>
        @endif

        <div class="max-w-md min-w-0">
            @if(!$isAdmin)
                <div class="flex items-center gap-1.5 mb-1 ml-1">
                    <span class="text-xs font-bold text-slate-600">{{ $senderName }}</span>
                </div>
            @endif

            <div class="p-3 rounded-2xl text-sm {{ $bubbleClass }}">
                @if(Str::startsWith($msg->message, 'http'))
                    @if(Str::contains($msg->message, ['jpg', 'jpeg', 'png', 'gif', 'webp']))
                        <a href="{{ $msg->message }}" target="_blank" class="block mb-1">
                            <img src="{{ $msg->message }}" class="max-w-full h-auto rounded-lg {{ $isAdmin ? 'border border-white/20' : 'border border-slate-200' }}">
                        </a>
                    @else
                        <a href="{{ $msg->message }}" target="_blank" class="flex items-center gap-2 hover:underline text-inherit">
                            <i class="fa-solid fa-file-arrow-down"></i>
                            <span class="truncate max-w-[150px]">Download Attachment</span>
                        </a>
                    @endif
                @else
                    {{ $msg->message }}
                @endif

                <span class="block text-[10px] {{ $timeClass }} mt-1.5 text-right">
                    {{ \Carbon\Carbon::parse($msg->created_at)->format('h:i A') }}
                </span>
            </div>
        </div>
    </div>
@endforeach