<?php

declare(strict_types=1);

namespace App\Filament\Pages\Monitoring;

use App\Filament\Clusters\Monitoring\AlertsCluster;
use App\Filament\Concerns\ClearsWorkspaceHubEnvironmentFilterState;
use App\Filament\Resources\AlertDeliveryResource;
use App\Filament\Resources\AlertDestinationResource;
use App\Filament\Resources\AlertRuleResource;
use App\Filament\Widgets\Alerts\AlertsKpiHeader;
use App\Models\User;
use App\Models\Workspace;
use App\Services\Auth\WorkspaceCapabilityResolver;
use App\Support\Auth\Capabilities;
use App\Support\Navigation\CanonicalNavigationContext;
use App\Support\Navigation\WorkspaceHubEnvironmentFilter;
use App\Support\OperateHub\OperateHubShell;
use App\Support\Ui\ActionSurface\ActionSurfaceDeclaration;
use App\Support\Ui\ActionSurface\Enums\ActionSurfaceProfile;
use App\Support\Ui\ActionSurface\Enums\ActionSurfaceSlot;
use App\Support\Ui\ActionSurface\Enums\ActionSurfaceType;
use App\Support\Workspaces\WorkspaceContext;
use BackedEnum;
use Filament\Actions\Action;
use Filament\Facades\Filament;
use Filament\Pages\Page;
use UnitEnum;

class Alerts extends Page
{
    use ClearsWorkspaceHubEnvironmentFilterState;

    protected static ?string $cluster = AlertsCluster::class;

    protected static ?int $navigationSort = 20;

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

    protected static ?string $navigationLabel = 'Overview';

    protected static string|BackedEnum|null $navigationIcon = 'heroicon-o-bell-alert';

    protected static ?string $slug = 'overview';

    protected static ?string $title = 'Alerts';

    protected string $view = 'filament.pages.monitoring.alerts';

    public function mount(): void
    {
        $this->resetWorkspaceHubEnvironmentFilterStateForCleanEntry(request());
        $this->environmentFilter();
    }

    public static function actionSurfaceDeclaration(): ActionSurfaceDeclaration
    {
        return ActionSurfaceDeclaration::forPage(ActionSurfaceProfile::ListOnlyReadOnly, ActionSurfaceType::ReadOnlyRegistryReport)
            ->satisfy(ActionSurfaceSlot::ListHeader, 'Header keeps alerts scope and origin navigation quiet on the page-level overview.')
            ->exempt(ActionSurfaceSlot::InspectAffordance, 'The alerts overview is a page-level monitoring summary and does not inspect records inline.')
            ->exempt(ActionSurfaceSlot::ListRowMoreMenu, 'The alerts overview does not render row-level secondary actions.')
            ->exempt(ActionSurfaceSlot::ListBulkMoreGroup, 'The alerts overview does not expose bulk actions.')
            ->exempt(ActionSurfaceSlot::ListEmptyState, 'The overview always renders KPI widgets and downstream drilldown navigation instead of a list-style empty state.');
    }

    public static function canAccess(): bool
    {
        if (Filament::getCurrentPanel()?->getId() !== 'admin') {
            return false;
        }

        $user = auth()->user();

        if (! $user instanceof User) {
            return false;
        }

        $workspaceId = app(WorkspaceContext::class)->currentWorkspaceId(request());

        if (! is_int($workspaceId)) {
            return false;
        }

        $workspace = Workspace::query()->whereKey($workspaceId)->first();

        if (! $workspace instanceof Workspace) {
            return false;
        }

        /** @var WorkspaceCapabilityResolver $resolver */
        $resolver = app(WorkspaceCapabilityResolver::class);

        return $resolver->isMember($user, $workspace)
            && $resolver->can($user, $workspace, Capabilities::ALERTS_VIEW);
    }

    protected function getHeaderWidgets(): array
    {
        return [
            AlertsKpiHeader::class,
        ];
    }

    /**
     * @return array{label: string, clear_url: string, description: string}|null
     */
    public function environmentFilterChip(): ?array
    {
        $filter = $this->environmentFilter();

        if (! $filter instanceof WorkspaceHubEnvironmentFilter) {
            return null;
        }

        return [
            'label' => $filter->displayName(),
            'clear_url' => $this->cleanWorkspaceHubUrl(route('filament.admin.alerts')),
            'description' => 'Delivery signal is filtered. Rules and targets remain workspace configuration.',
        ];
    }

    public function alertDeliveriesUrl(): string
    {
        return AlertDeliveryResource::getUrl('index', $this->filteredNavigationParameters(), panel: 'admin');
    }

    public function alertRulesUrl(): string
    {
        return $this->cleanWorkspaceHubUrl(AlertRuleResource::getUrl(panel: 'admin'));
    }

    public function alertDestinationsUrl(): string
    {
        return $this->cleanWorkspaceHubUrl(AlertDestinationResource::getUrl(panel: 'admin'));
    }

    public function auditLogUrl(): string
    {
        return route('admin.monitoring.audit-log', $this->filteredNavigationParameters());
    }

    /**
     * @return array<Action>
     */
    protected function getHeaderActions(): array
    {
        $actions = app(OperateHubShell::class)->headerActions(
            scopeActionName: 'operate_hub_scope_alerts',
            returnActionName: 'operate_hub_return_alerts',
        );

        $navigationContext = CanonicalNavigationContext::fromRequest(request());

        if ($navigationContext?->backLinkLabel !== null && $navigationContext->backLinkUrl !== null) {
            array_splice($actions, 1, 0, [
                Action::make('operate_hub_back_to_origin_alerts')
                    ->label($navigationContext->backLinkLabel)
                    ->icon('heroicon-o-arrow-left')
                    ->color('gray')
                    ->url($navigationContext->backLinkUrl),
            ]);
        }

        return $actions;
    }

    /**
     * @return array<string, mixed>
     */
    private function filteredNavigationParameters(): array
    {
        return array_filter(
            array_merge(
                $this->navigationContext()?->toQuery() ?? [],
                $this->environmentFilter()?->queryParameters() ?? [],
            ),
            static fn (mixed $value): bool => $value !== null && $value !== '' && $value !== [],
        );
    }

    private function navigationContext(): ?CanonicalNavigationContext
    {
        return CanonicalNavigationContext::fromRequest(request());
    }

    private function environmentFilter(): ?WorkspaceHubEnvironmentFilter
    {
        $workspace = app(WorkspaceContext::class)->currentWorkspace(request());

        if (! $workspace instanceof Workspace) {
            return null;
        }

        return WorkspaceHubEnvironmentFilter::fromRequest(request(), $workspace);
    }
}