<?php

declare(strict_types=1);

namespace App\Filament\Pages\Monitoring;

use App\Filament\Resources\EvidenceSnapshotResource;
use App\Models\EvidenceSnapshot;
use App\Models\Tenant;
use App\Models\User;
use App\Support\Ui\ActionSurface\ActionSurfaceDeclaration;
use App\Support\Ui\ActionSurface\Enums\ActionSurfaceInspectAffordance;
use App\Support\Ui\ActionSurface\Enums\ActionSurfaceProfile;
use App\Support\Ui\ActionSurface\Enums\ActionSurfaceSlot;
use App\Support\Workspaces\WorkspaceContext;
use BackedEnum;
use Filament\Actions\Action;
use Filament\Pages\Page;
use Illuminate\Auth\AuthenticationException;
use UnitEnum;

class EvidenceOverview extends Page
{
    protected static bool $isDiscovered = false;

    protected static bool $shouldRegisterNavigation = false;

    protected static string|BackedEnum|null $navigationIcon = 'heroicon-o-shield-check';

    protected static string|UnitEnum|null $navigationGroup = 'Monitoring';

    protected static ?string $title = 'Evidence Overview';

    protected string $view = 'filament.pages.monitoring.evidence-overview';

    /**
     * @var list<array<string, mixed>>
     */
    public array $rows = [];

    public ?int $tenantFilter = null;

    public static function actionSurfaceDeclaration(): ActionSurfaceDeclaration
    {
        return ActionSurfaceDeclaration::forPage(ActionSurfaceProfile::ListOnlyReadOnly)
            ->satisfy(ActionSurfaceSlot::ListHeader, 'The overview header exposes a clear-filters action when a tenant prefilter is active.')
            ->satisfy(ActionSurfaceSlot::InspectAffordance, ActionSurfaceInspectAffordance::ClickableRow->value)
            ->exempt(ActionSurfaceSlot::ListRowMoreMenu, 'The overview exposes a single drill-down link per row without a More menu.')
            ->exempt(ActionSurfaceSlot::ListBulkMoreGroup, 'The overview does not expose bulk actions.')
            ->satisfy(ActionSurfaceSlot::ListEmptyState, 'The empty state explains the current scope and offers a clear-filters CTA.');
    }

    public function mount(): void
    {
        $user = auth()->user();

        if (! $user instanceof User) {
            throw new AuthenticationException;
        }

        $workspaceContext = app(WorkspaceContext::class);
        $workspace = $workspaceContext->currentWorkspaceForMemberOrFail($user, request());
        $workspaceId = (int) $workspace->getKey();

        $accessibleTenants = $user->tenants()
            ->where('tenants.workspace_id', $workspaceId)
            ->orderBy('tenants.name')
            ->get()
            ->filter(fn (Tenant $tenant): bool => (int) $tenant->workspace_id === $workspaceId && $user->can('evidence.view', $tenant))
            ->values();

        $this->tenantFilter = is_numeric(request()->query('tenant_id')) ? (int) request()->query('tenant_id') : null;

        $tenantIds = $accessibleTenants->pluck('id')->map(static fn (mixed $id): int => (int) $id)->all();

        $query = EvidenceSnapshot::query()
            ->with('tenant')
            ->where('workspace_id', $workspaceId)
            ->whereIn('tenant_id', $tenantIds)
            ->where('status', 'active')
            ->latest('generated_at');

        if ($this->tenantFilter !== null) {
            $query->where('tenant_id', $this->tenantFilter);
        }

        $snapshots = $query->get()->unique('tenant_id')->values();

        $this->rows = $snapshots->map(function (EvidenceSnapshot $snapshot): array {
            return [
                'tenant_name' => $snapshot->tenant?->name ?? 'Unknown tenant',
                'tenant_id' => (int) $snapshot->tenant_id,
                'snapshot_id' => (int) $snapshot->getKey(),
                'completeness_state' => (string) $snapshot->completeness_state,
                'generated_at' => $snapshot->generated_at?->toDateTimeString(),
                'missing_dimensions' => (int) (($snapshot->summary['missing_dimensions'] ?? 0)),
                'stale_dimensions' => (int) (($snapshot->summary['stale_dimensions'] ?? 0)),
                'view_url' => EvidenceSnapshotResource::getUrl('index', tenant: $snapshot->tenant),
            ];
        })->all();
    }

    /**
     * @return array<Action>
     */
    protected function getHeaderActions(): array
    {
        return [
            Action::make('clear_filters')
                ->label('Clear filters')
                ->color('gray')
                ->visible(fn (): bool => $this->tenantFilter !== null)
                ->url(route('admin.evidence.overview')),
        ];
    }
}