<?php

namespace App\Filament\Widgets;

use Filament\Widgets\StatsOverviewWidget;
use Filament\Widgets\StatsOverviewWidget\Stat;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Cache;

class UploadPipelineHealthWidget extends StatsOverviewWidget
{
    protected static ?int $sort = 2;

    protected ?string $pollingInterval = '60s';

    protected function getStats(): array
    {
        $snapshot = Cache::get('storage:monitor:last');

        if (! is_array($snapshot)) {
            return [
                Stat::make(__('admin.ops_health.pipeline.label'), __('admin.ops_health.pipeline.no_snapshot'))
                    ->description(__('admin.ops_health.pipeline.no_snapshot_desc'))
                    ->color('warning'),
            ];
        }

        $totals = $this->summarizeAssets($snapshot['targets'] ?? []);
        $alerts = $snapshot['alerts'] ?? [];
        $snapshotAge = $this->formatSnapshotAge($snapshot['generated_at'] ?? null);
        $snapshotLabel = $snapshotAge
            ? __('admin.ops_health.snapshot_age', ['age' => $snapshotAge])
            : __('admin.ops_health.snapshot_missing');

        return [
            Stat::make(__('admin.ops_health.pipeline.pending'), number_format($totals['pending']))
                ->description($snapshotLabel)
                ->descriptionIcon('heroicon-m-clock')
                ->color($totals['pending'] > 0 ? 'warning' : 'success'),
            Stat::make(__('admin.ops_health.pipeline.failed'), number_format($totals['failed']))
                ->description(__('admin.ops_health.pipeline.archived_hint', ['count' => number_format($totals['archived'])]))
                ->color($totals['failed'] > 0 ? 'danger' : 'success'),
            Stat::make(__('admin.ops_health.pipeline.total'), number_format($totals['total']))
                ->description(__('admin.ops_health.pipeline.hot_hint', ['count' => number_format($totals['hot'])]))
                ->color('primary'),
            Stat::make(__('admin.ops_health.pipeline.alerts'), number_format(count($alerts)))
                ->color(count($alerts) > 0 ? 'danger' : 'success'),
        ];
    }

    private function summarizeAssets(array $targets): array
    {
        $totals = [
            'total' => 0,
            'pending' => 0,
            'failed' => 0,
            'hot' => 0,
            'archived' => 0,
        ];

        foreach ($targets as $target) {
            $assets = $target['assets'] ?? [];
            $totals['total'] += (int) ($assets['total'] ?? 0);

            $byStatus = $assets['by_status'] ?? [];
            foreach (['pending', 'failed', 'hot', 'archived'] as $status) {
                $totals[$status] += (int) ($byStatus[$status]['count'] ?? 0);
            }
        }

        return $totals;
    }

    private function formatSnapshotAge(?string $timestamp): ?string
    {
        if (! $timestamp) {
            return null;
        }

        try {
            return Carbon::parse($timestamp)->diffForHumans();
        } catch (\Throwable) {
            return null;
        }
    }
}