@php
/** @var array $nodes */
/** @var array $expanded */
/** @var string $selected */
/** @var string $self_route */
$headers = $headers ?? [];
$meta_keys = $meta_keys ?? [];
$colspan = 1 + count($headers);

$buildUrl = function (string $toggle) use ($self_route, $expanded, $selected) {
$qs = http_build_query([
'toggle' => $toggle,
'expanded' => implode(',', $expanded),
'selected' => $selected,
]);
return $self_route . '?' . $qs;
};
$selectUrl = function (string $id) use ($self_route, $expanded) {
$qs = http_build_query([
'expanded' => implode(',', $expanded),
'selected' => $id,
]);
return $self_route . '?' . $qs;
};

// Flatten tree depth-first so we can emit one <TR> per visible node.
    $flatten = function (array $nodes, callable $self) use (&$flatten): array {
    $out = [];
    foreach ($nodes as $n) {
    $out[] = $n;
    if (!empty($n['children'])) {
    foreach ($flatten($n['children'], $self) as $child) {
    $out[] = $child;
    }
    }
    }
    return $out;
    };
    $visible = $flatten($nodes, $flatten);
    @endphp

    <TABLE border=0 cellspacing=0 cellpadding=2 width=100%>
        @if(!empty($headers))
        <TR class="TR1">
            <TH ALIGN=LEFT>Hiérarchie</TH>
            @foreach($headers as $h)
            <TH ALIGN=RIGHT>{{ $h }}</TH>
            @endforeach
        </TR>
        @endif

        @forelse($visible as $i => $node)
        @php
        $isExpanded = in_array($node['id'], $expanded, true);
        $isSelected = $selected === $node['id'];
        $depth = (int) ($node['depth'] ?? 0);
        $type = $node['type'] ?? 'L';
        // Legacy cell classification (UI §2.6):
        // Level 0 + Type A -> use TH tag
        // Level 1 + Type A with children -> TD with class=menu
        // Otherwise -> plain TD
        $rowClass = 'TR' . (($i % 2) + 1);
        if ($isSelected) $rowClass .= ' Sel';
        @endphp
        <TR class="{{ $rowClass }}">
            @php
            $cellClass = '';
            $cellTag = 'TD';
            if ($depth === 0 && $type === 'A') { $cellTag = 'TH'; }
            elseif ($depth === 1 && $type === 'A' && !empty($node['has_children'])) { $cellClass = 'menu'; }
            @endphp
            <{{ $cellTag }} ALIGN=LEFT @if($cellClass) CLASS="{{ $cellClass }}" @endif>
                {{-- Indentation: one "img-branch-cont-2" per parent depth --}}
                @for($d = 0; $d < $depth; $d++)
                    <IMG SRC="{{ asset('img/img-branch-cont-2.gif') }}" BORDER=0 ALT="|">
                    @endfor

                    @if($depth > 0)
                    <IMG SRC="{{ asset('img/img-branch-cont-1.gif') }}" BORDER=0 ALT="-">
                    @endif

                    @if(!empty($node['has_children']))
                    <A HREF="{{ $buildUrl($node['id']) }}">
                        <IMG SRC="{{ asset($isExpanded ? 'img/minus.gif' : 'img/plus.gif') }}" BORDER=0 ALT="{{ $isExpanded ? '-' : '+' }}">
                        <IMG SRC="{{ asset($isExpanded ? 'img/img-folder-open-1.gif' : 'img/img-folder-closed-1.gif') }}" BORDER=0 ALT="">
                    </A>
                    @else
                    <IMG SRC="{{ asset('img/img-folder-closed-1.gif') }}" BORDER=0 ALT="">
                    @endif

                    <A HREF="{{ $selectUrl($node['id']) }}" @if($isSelected) style="font-weight:bold;text-decoration:underline" @endif>
                        {{ $node['label'] }}
                    </A>
            </{{ $cellTag }}>

            @foreach($meta_keys as $mk)
            <TD ALIGN=RIGHT>
                @php $v = $node['meta'][$mk] ?? null; @endphp
                @if(is_float($v))
                {{ number_format($v, 2) }}
                @elseif(is_int($v))
                {{ $v }}
                @else
                {{ $v ?? '' }}
                @endif
            </TD>
            @endforeach
        </TR>
        @empty
        <TR class="TR2">
            <TD COLSPAN="{{ $colspan }}"><i>Aucune donnée.</i></TD>
        </TR>
        @endforelse
    </TABLE>

    {{-- Preserve tree state across subsequent form POSTs on the same page. --}}
    <INPUT TYPE="hidden" NAME="expanded" VALUE="{{ implode(',', $expanded) }}">
    <INPUT TYPE="hidden" NAME="selected" VALUE="{{ $selected }}">