@php
    $diff = $getState() ?? ['summary' => [], 'added' => [], 'removed' => [], 'changed' => []];
    $summary = $diff['summary'] ?? [];
    $policyType = $diff['policy_type'] ?? null;

    $groupByBlock = static function (array $items): array {
        $groups = [];

        foreach ($items as $path => $value) {
            if (! is_string($path) || $path === '') {
                continue;
            }

            $parts = explode(' > ', $path, 2);

            if (count($parts) === 2) {
                [$group, $label] = $parts;
            } else {
                $group = 'Other';
                $label = $path;
            }

            $groups[$group][$label] = $value;
        }

        ksort($groups);

        return $groups;
    };

    $stringify = static function (mixed $value): string {
        if ($value === null) {
            return '—';
        }

        if (is_bool($value)) {
            return $value ? 'Enabled' : 'Disabled';
        }

        if (is_scalar($value)) {
            return (string) $value;
        }

        return json_encode($value, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE) ?: '';
    };

    $isExpandable = static function (mixed $value): bool {
        if (is_array($value)) {
            return true;
        }

        return is_string($value) && strlen($value) > 160;
    };

    $isScriptKey = static function (mixed $name): bool {
        return in_array((string) $name, ['scriptContent', 'detectionScriptContent', 'remediationScriptContent'], true);
    };

    $canHighlightScripts = static function (?string $policyType): bool {
        return (bool) config('tenantpilot.display.show_script_content', false)
            && in_array($policyType, ['deviceManagementScript', 'deviceShellScript', 'deviceHealthScript'], true);
    };

    $selectGrammar = static function (?string $policyType, string $code): string {
        if ($policyType === 'deviceShellScript') {
            $firstLine = strtok($code, "\n") ?: '';
            $shebang = trim($firstLine);

            if (str_starts_with($shebang, '#!')) {
                if (str_contains($shebang, 'zsh')) {
                    return 'zsh';
                }

                if (str_contains($shebang, 'bash')) {
                    return 'bash';
                }

                return 'sh';
            }

            return 'sh';
        }

        return 'powershell';
    };

    $highlight = static function (?string $policyType, string $code, string $fallbackClass = '') use ($selectGrammar): ?string {
        if (! class_exists(\Torchlight\Engine\Engine::class)) {
            return null;
        }

        try {
            return (new \Torchlight\Engine\Engine())->codeToHtml(
                code: $code,
                grammar: $selectGrammar($policyType, $code),
                theme: [
                    'light' => 'github-light',
                    'dark' => 'github-dark',
                ],
                withGutter: false,
                withWrapper: true,
            );
        } catch (\Throwable $e) {
            return null;
        }
    };

    $highlightInline = static function (?string $policyType, string $code) use ($selectGrammar): ?string {
        if (! class_exists(\Torchlight\Engine\Engine::class)) {
            return null;
        }

        if ($code === '') {
            return '';
        }

        try {
            $html = (new \Torchlight\Engine\Engine())->codeToHtml(
                code: $code,
                grammar: $selectGrammar($policyType, $code),
                theme: [
                    'light' => 'github-light',
                    'dark' => 'github-dark',
                ],
                withGutter: false,
                withWrapper: false,
            );

            if (! preg_match('/^<pre><code[^>]*>(.*)<\\/code><\\/pre>$/s', $html, $matches)) {
                return null;
            }

            $inner = $matches[1] ?? '';

            return trim((string) preg_replace('/<!--\s*Syntax highlighted by[^>]*-->/', '', $inner));
        } catch (\Throwable $e) {
            return null;
        }
    };

    $splitLines = static function (string $text): array {
        $text = str_replace(["\r\n", "\r"], "\n", $text);

        return $text === '' ? [] : explode("\n", $text);
    };

    $myersLineDiff = static function (array $a, array $b): array {
        $n = count($a);
        $m = count($b);
        $max = $n + $m;

        $v = [1 => 0];
        $trace = [];

        for ($d = 0; $d <= $max; $d++) {
            $trace[$d] = $v;

            for ($k = -$d; $k <= $d; $k += 2) {
                $kPlus = $v[$k + 1] ?? 0;
                $kMinus = $v[$k - 1] ?? 0;

                if ($k === -$d || ($k !== $d && $kMinus < $kPlus)) {
                    $x = $kPlus;
                } else {
                    $x = $kMinus + 1;
                }

                $y = $x - $k;

                while ($x < $n && $y < $m && $a[$x] === $b[$y]) {
                    $x++;
                    $y++;
                }

                $v[$k] = $x;

                if ($x >= $n && $y >= $m) {
                    break 2;
                }
            }
        }

        $ops = [];
        $x = $n;
        $y = $m;

        for ($d = count($trace) - 1; $d >= 0; $d--) {
            $v = $trace[$d];
            $k = $x - $y;

            $kPlus = $v[$k + 1] ?? 0;
            $kMinus = $v[$k - 1] ?? 0;

            if ($k === -$d || ($k !== $d && $kMinus < $kPlus)) {
                $prevK = $k + 1;
            } else {
                $prevK = $k - 1;
            }

            $prevX = $v[$prevK] ?? 0;
            $prevY = $prevX - $prevK;

            while ($x > $prevX && $y > $prevY) {
                $ops[] = ['type' => 'equal', 'line' => $a[$x - 1]];
                $x--;
                $y--;
            }

            if ($d === 0) {
                break;
            }

            if ($x === $prevX) {
                $ops[] = ['type' => 'insert', 'line' => $b[$y - 1] ?? ''];
                $y--;
            } else {
                $ops[] = ['type' => 'delete', 'line' => $a[$x - 1] ?? ''];
                $x--;
            }
        }

        return array_reverse($ops);
    };

    $scriptLineDiff = static function (string $fromText, string $toText) use ($splitLines, $myersLineDiff): array {
        return $myersLineDiff($splitLines($fromText), $splitLines($toText));
    };
@endphp

<div class="space-y-4">
    <x-filament::section
        heading="Normalized diff"
        :description="$summary['message'] ?? sprintf('%d added, %d removed, %d changed', $summary['added'] ?? 0, $summary['removed'] ?? 0, $summary['changed'] ?? 0)"
    >
        <div class="flex flex-wrap gap-2">
            <x-filament::badge color="success">
                {{ (int) ($summary['added'] ?? 0) }} added
            </x-filament::badge>
            <x-filament::badge color="danger">
                {{ (int) ($summary['removed'] ?? 0) }} removed
            </x-filament::badge>
            <x-filament::badge color="warning">
                {{ (int) ($summary['changed'] ?? 0) }} changed
            </x-filament::badge>
        </div>
    </x-filament::section>

    @foreach (['changed' => ['label' => 'Changed', 'collapsed' => false], 'added' => ['label' => 'Added', 'collapsed' => true], 'removed' => ['label' => 'Removed', 'collapsed' => true]] as $key => $meta)
        @php
            $items = $diff[$key] ?? [];
            $groups = $groupByBlock(is_array($items) ? $items : []);
        @endphp

        @if ($groups !== [])
            <x-filament::section
                :heading="$meta['label']"
                collapsible
                :collapsed="$meta['collapsed']"
            >
                <div class="space-y-6">
                    @foreach ($groups as $group => $groupItems)
                        <div>
                            <div class="flex items-center justify-between">
                                <div class="text-sm font-medium text-gray-900 dark:text-white">
                                    {{ $group }}
                                </div>
                                <x-filament::badge size="sm" color="gray">
                                    {{ count($groupItems) }}
                                </x-filament::badge>
                            </div>

                            <div class="mt-2 divide-y divide-gray-200 rounded-lg border border-gray-200 dark:divide-white/10 dark:border-white/10">
                                @foreach ($groupItems as $name => $value)
                                    <div class="px-4 py-3">
                                        @if ($key === 'changed' && is_array($value) && array_key_exists('from', $value) && array_key_exists('to', $value))
                                            @php
                                                $from = $value['from'];
                                                $to = $value['to'];
                                                $fromText = $stringify($from);
                                                $toText = $stringify($to);

                                                $isScriptContent = $canHighlightScripts($policyType) && $isScriptKey($name);
                                                $ops = $isScriptContent ? $scriptLineDiff((string) $fromText, (string) $toText) : [];
                                                $useTorchlight = $isScriptContent && class_exists(\Torchlight\Engine\Engine::class);
                                            @endphp
                                            <div class="grid grid-cols-1 gap-2 sm:grid-cols-3">
                                                <div class="text-sm font-medium text-gray-900 dark:text-white">
                                                    {{ (string) $name }}
                                                </div>

                                                @if ($isScriptContent)
                                                    <div class="text-sm text-gray-600 dark:text-gray-300 sm:col-span-2">
                                                        <span class="text-xs font-semibold uppercase tracking-wide text-gray-500 dark:text-gray-400">Script</span>
                                                        <details class="mt-1">
                                                            <summary class="cursor-pointer text-sm text-gray-700 dark:text-gray-200">
                                                                View
                                                            </summary>

                                                            <div x-data="{ tab: 'diff' }" class="mt-2 space-y-3">
                                                                <div class="flex flex-wrap items-center gap-2">
                                                                    <x-filament::button size="xs" color="gray" type="button" x-on:click="tab = 'diff'" x-bind:class="tab === 'diff' ? 'ring-1 ring-gray-300 dark:ring-white/20' : ''">
                                                                        Diff
                                                                    </x-filament::button>
                                                                    <x-filament::button size="xs" color="gray" type="button" x-on:click="tab = 'before'" x-bind:class="tab === 'before' ? 'ring-1 ring-gray-300 dark:ring-white/20' : ''">
                                                                        Before
                                                                    </x-filament::button>
                                                                    <x-filament::button size="xs" color="gray" type="button" x-on:click="tab = 'after'" x-bind:class="tab === 'after' ? 'ring-1 ring-gray-300 dark:ring-white/20' : ''">
                                                                        After
                                                                    </x-filament::button>
                                                                </div>

                                                                <div x-show="tab === 'diff'" x-cloak>
                                                                    @php
                                                                        $rows = [];
                                                                        $count = count($ops);

                                                                        for ($i = 0; $i < $count; $i++) {
                                                                            $op = $ops[$i];
                                                                            $next = $ops[$i + 1] ?? null;
                                                                            $type = $op['type'] ?? null;
                                                                            $line = (string) ($op['line'] ?? '');

                                                                            if ($type === 'equal') {
                                                                                $rows[] = [
                                                                                    'left' => ['type' => 'equal', 'line' => $line],
                                                                                    'right' => ['type' => 'equal', 'line' => $line],
                                                                                ];
                                                                                continue;
                                                                            }

                                                                            if ($type === 'delete' && is_array($next) && ($next['type'] ?? null) === 'insert') {
                                                                                $rows[] = [
                                                                                    'left' => ['type' => 'delete', 'line' => $line],
                                                                                    'right' => ['type' => 'insert', 'line' => (string) ($next['line'] ?? '')],
                                                                                ];
                                                                                $i++;
                                                                                continue;
                                                                            }

                                                                            if ($type === 'delete') {
                                                                                $rows[] = [
                                                                                    'left' => ['type' => 'delete', 'line' => $line],
                                                                                    'right' => ['type' => 'blank', 'line' => ''],
                                                                                ];
                                                                                continue;
                                                                            }

                                                                            if ($type === 'insert') {
                                                                                $rows[] = [
                                                                                    'left' => ['type' => 'blank', 'line' => ''],
                                                                                    'right' => ['type' => 'insert', 'line' => $line],
                                                                                ];
                                                                                continue;
                                                                            }
                                                                        }
                                                                    @endphp

                                                                    <div class="grid grid-cols-1 gap-3 sm:grid-cols-2">
                                                                        <div>
                                                                            <div class="text-xs font-semibold uppercase tracking-wide text-gray-500 dark:text-gray-400">Old</div>
                                                                            <pre class="mt-1 max-h-96 overflow-auto font-mono text-xs text-gray-800 dark:text-gray-200 whitespace-pre">@php
foreach ($rows as $row) {
    $left = $row['left'];
    $leftType = $left['type'];
    $leftLine = (string) ($left['line'] ?? '');

    $leftHighlighted = $useTorchlight ? $highlightInline($policyType, $leftLine) : null;
    $leftRendered = (is_string($leftHighlighted) && $leftHighlighted !== '') ? $leftHighlighted : e($leftLine);

    if ($leftType === 'equal') {
        if ($useTorchlight) {
            @endphp
            @once
                @include('filament.partials.torchlight-dark-overrides')
            @endonce
            @php
        }

        echo $leftRendered."\n";
        continue;
    }

    if ($leftType === 'delete') {
        if ($useTorchlight) {
            @endphp
            @once
                @include('filament.partials.torchlight-dark-overrides')
            @endonce
            @php
        }

        echo '<span class="block bg-danger-50 text-danger-700 dark:bg-danger-950/40 dark:text-danger-200">- '.$leftRendered."</span>\n";
        continue;
    }

    echo "\n";
}
@endphp</pre>
                                                                        </div>

                                                                        <div>
                                                                            <div class="text-xs font-semibold uppercase tracking-wide text-gray-500 dark:text-gray-400">New</div>
                                                                            <pre class="mt-1 max-h-96 overflow-auto font-mono text-xs text-gray-800 dark:text-gray-200 whitespace-pre">@php
foreach ($rows as $row) {
    $right = $row['right'];
    $rightType = $right['type'];
    $rightLine = (string) ($right['line'] ?? '');

    $rightHighlighted = $useTorchlight ? $highlightInline($policyType, $rightLine) : null;
    $rightRendered = (is_string($rightHighlighted) && $rightHighlighted !== '') ? $rightHighlighted : e($rightLine);

    if ($rightType === 'equal') {
        if ($useTorchlight) {
            @endphp
            @once
                @include('filament.partials.torchlight-dark-overrides')
            @endonce
            @php
        }

        echo $rightRendered."\n";
        continue;
    }

    if ($rightType === 'insert') {
        if ($useTorchlight) {
            @endphp
            @once
                @include('filament.partials.torchlight-dark-overrides')
            @endonce
            @php
        }

        echo '<span class="block bg-success-50 text-success-700 dark:bg-success-950/40 dark:text-success-200">+ '.$rightRendered."</span>\n";
        continue;
    }

    echo "\n";
}
@endphp</pre>
                                                                        </div>
                                                                    </div>
                                                                </div>

                                                                <div x-show="tab === 'before'" x-cloak>
                                                                    <div class="text-xs font-semibold uppercase tracking-wide text-gray-500 dark:text-gray-400">Before</div>
                                                                    @php
                                                                        $highlightedBefore = $useTorchlight ? $highlight($policyType, (string) $fromText) : null;
                                                                    @endphp

                                                                    @if (is_string($highlightedBefore) && $highlightedBefore !== '')
                                                                        @once
                                                                            @include('filament.partials.torchlight-dark-overrides')
                                                                        @endonce

                                                                        <div class="mt-1 max-h-96 overflow-auto">{!! $highlightedBefore !!}</div>
                                                                    @else
                                                                        <pre class="mt-1 max-h-96 overflow-auto font-mono text-xs text-gray-800 dark:text-gray-200 whitespace-pre">{{ (string) $fromText }}</pre>
                                                                    @endif
                                                                </div>

                                                                <div x-show="tab === 'after'" x-cloak>
                                                                    <div class="text-xs font-semibold uppercase tracking-wide text-gray-500 dark:text-gray-400">After</div>
                                                                    @php
                                                                        $highlightedAfter = $useTorchlight ? $highlight($policyType, (string) $toText) : null;
                                                                    @endphp

                                                                    @if (is_string($highlightedAfter) && $highlightedAfter !== '')
                                                                        @once
                                                                            @include('filament.partials.torchlight-dark-overrides')
                                                                        @endonce

                                                                        <div class="mt-1 max-h-96 overflow-auto">{!! $highlightedAfter !!}</div>
                                                                    @else
                                                                        <pre class="mt-1 max-h-96 overflow-auto font-mono text-xs text-gray-800 dark:text-gray-200 whitespace-pre">{{ (string) $toText }}</pre>
                                                                    @endif
                                                                </div>
                                                            </div>
                                                        </details>
                                                    </div>
                                                @else
                                                    <div class="text-sm text-gray-600 dark:text-gray-300">
                                                        <span class="text-xs font-semibold uppercase tracking-wide text-gray-500 dark:text-gray-400">From</span>
                                                        @if ($isExpandable($from))
                                                            <details class="mt-1">
                                                                <summary class="cursor-pointer text-sm text-gray-700 dark:text-gray-200">
                                                                    View
                                                                </summary>
                                                                <pre class="mt-2 overflow-x-auto text-xs text-gray-800 dark:text-gray-200">{{ $fromText }}</pre>
                                                            </details>
                                                        @else
                                                            <div class="mt-1">{{ $fromText }}</div>
                                                        @endif
                                                    </div>
                                                    <div class="text-sm text-gray-600 dark:text-gray-300">
                                                        <span class="text-xs font-semibold uppercase tracking-wide text-gray-500 dark:text-gray-400">To</span>
                                                        @if ($isExpandable($to))
                                                            <details class="mt-1">
                                                                <summary class="cursor-pointer text-sm text-gray-700 dark:text-gray-200">
                                                                    View
                                                                </summary>
                                                                <pre class="mt-2 overflow-x-auto text-xs text-gray-800 dark:text-gray-200">{{ $toText }}</pre>
                                                            </details>
                                                        @else
                                                            <div class="mt-1">{{ $toText }}</div>
                                                        @endif
                                                    </div>
                                                @endif
                                            </div>
                                        @else
                                            @php
                                                $text = $stringify($value);
                                            @endphp
                                            <div class="flex flex-col gap-2 sm:flex-row sm:items-start sm:justify-between">
                                                <div class="text-sm font-medium text-gray-900 dark:text-white">
                                                    {{ (string) $name }}
                                                </div>
                                                <div class="text-sm text-gray-700 dark:text-gray-200 sm:max-w-[70%]">
                                                    @if ($isExpandable($value))
                                                        <details>
                                                            <summary class="cursor-pointer text-sm text-gray-700 dark:text-gray-200">
                                                                View
                                                            </summary>
                                                            @php
                                                                $isScriptContent = $canHighlightScripts($policyType) && $isScriptKey($name);
                                                                $highlighted = $isScriptContent ? $highlight($policyType, (string) $text) : null;
                                                            @endphp

                                                            @if (is_string($highlighted) && $highlighted !== '')
                                                                @once
                                                                    @include('filament.partials.torchlight-dark-overrides')
                                                                @endonce

                                                                <div class="mt-2 overflow-x-auto">{!! $highlighted !!}</div>
                                                            @else
                                                                <pre class="mt-2 overflow-x-auto text-xs text-gray-800 dark:text-gray-200">{{ $text }}</pre>
                                                            @endif
                                                        </details>
                                                    @else
                                                        <div class="break-words">{{ $text }}</div>
                                                    @endif
                                                </div>
                                            </div>
                                        @endif
                                    </div>
                                @endforeach
                            </div>
                        </div>
                    @endforeach
                </div>
            </x-filament::section>
        @endif
    @endforeach
</div>