<?php

namespace App\Jobs;

use App\Jobs\Middleware\TrackOperationRun;
use App\Models\BackupItem;
use App\Models\BackupSet;
use App\Models\OperationRun;
use App\Models\Tenant;
use App\Models\User;
use App\Services\BulkOperationService;
use App\Services\Intune\AuditLogger;
use App\Services\OperationRunService;
use App\Support\OperationRunLinks;
use Filament\Notifications\Notification;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Throwable;

class RemovePoliciesFromBackupSetJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    public ?OperationRun $operationRun = null;

    /**
     * @param  array<int,int>  $backupItemIds
     */
    public function __construct(
        public int $backupSetId,
        public array $backupItemIds,
        public int $initiatorUserId,
        ?OperationRun $operationRun = null,
    ) {
        $this->operationRun = $operationRun;
    }

    /**
     * @return array<int, object>
     */
    public function middleware(): array
    {
        return [new TrackOperationRun];
    }

    public function handle(
        AuditLogger $auditLogger,
        BulkOperationService $bulkOperationService,
    ): void {
        $backupSet = BackupSet::query()->with(['tenant'])->find($this->backupSetId);

        if (! $backupSet instanceof BackupSet) {
            if ($this->operationRun) {
                /** @var OperationRunService $opService */
                $opService = app(OperationRunService::class);
                $opService->updateRun(
                    $this->operationRun,
                    'completed',
                    'failed',
                    ['backup_set_id' => $this->backupSetId],
                    [['code' => 'backup_set.not_found', 'message' => 'Backup set not found.']]
                );
            }

            return;
        }

        $tenant = $backupSet->tenant;

        $initiator = User::query()->find($this->initiatorUserId);

        $requestedIds = collect($this->backupItemIds)
            ->map(fn (mixed $value): int => (int) $value)
            ->filter(fn (int $value): bool => $value > 0)
            ->unique()
            ->sort()
            ->values()
            ->all();

        $requestedCount = count($requestedIds);

        $failures = [];

        try {
            /** @var \Illuminate\Database\Eloquent\Collection<int, BackupItem> $items */
            $items = BackupItem::query()
                ->where('backup_set_id', $backupSet->getKey())
                ->whereIn('id', $requestedIds)
                ->get();

            $foundIds = $items->pluck('id')->map(fn (mixed $value): int => (int) $value)->all();
            $missingIds = array_values(array_diff($requestedIds, $foundIds));

            foreach ($missingIds as $missingId) {
                $failures[] = [
                    'code' => 'backup_item.not_found',
                    'message' => $bulkOperationService->sanitizeFailureReason("Backup item {$missingId} not found (already removed?)."),
                ];
            }

            $removed = 0;
            $policyIds = [];
            $policyIdentifiers = [];

            foreach ($items as $item) {
                $item->delete();
                $removed++;

                if ($item->policy_id) {
                    $policyIds[] = (int) $item->policy_id;
                }

                if ($item->policy_identifier) {
                    $policyIdentifiers[] = (string) $item->policy_identifier;
                }
            }

            $backupSet->update([
                'item_count' => $backupSet->items()->count(),
            ]);

            if ($tenant instanceof Tenant) {
                $auditLogger->log(
                    tenant: $tenant,
                    action: 'backup.items_removed',
                    resourceType: 'backup_set',
                    resourceId: (string) $backupSet->getKey(),
                    status: 'success',
                    context: [
                        'metadata' => [
                            'removed_count' => $removed,
                            'requested_count' => $requestedCount,
                            'missing_count' => count($missingIds),
                            'policy_ids' => array_values(array_unique($policyIds)),
                            'policy_identifiers' => array_values(array_unique($policyIdentifiers)),
                            'backup_set_id' => (int) $backupSet->getKey(),
                            'initiator_user_id' => $initiator?->getKey(),
                        ],
                    ],
                    actorId: $initiator?->getKey(),
                );
            }

            if ($this->operationRun) {
                /** @var OperationRunService $opService */
                $opService = app(OperationRunService::class);

                $outcome = 'succeeded';
                if ($removed === 0) {
                    $outcome = 'failed';
                } elseif ($failures !== []) {
                    $outcome = 'partially_succeeded';
                }

                $opService->updateRun(
                    $this->operationRun,
                    'completed',
                    $outcome,
                    [
                        'backup_set_id' => (int) $backupSet->getKey(),
                        'requested' => $requestedCount,
                        'removed' => $removed,
                        'missing' => count($missingIds),
                        'remaining' => (int) $backupSet->item_count,
                    ],
                    $failures,
                );
            }

            $this->notifyCompleted(
                initiator: $initiator,
                tenant: $tenant instanceof Tenant ? $tenant : null,
                removed: $removed,
                requested: $requestedCount,
                missing: count($missingIds),
                outcome: $outcome,
            );
        } catch (Throwable $throwable) {
            if ($tenant instanceof Tenant) {
                $auditLogger->log(
                    tenant: $tenant,
                    action: 'backup.items_removed',
                    resourceType: 'backup_set',
                    resourceId: (string) $backupSet->getKey(),
                    status: 'failed',
                    context: [
                        'metadata' => [
                            'requested_count' => $requestedCount,
                            'backup_set_id' => (int) $backupSet->getKey(),
                        ],
                    ],
                    actorId: $initiator?->getKey(),
                );
            }

            if ($this->operationRun) {
                /** @var OperationRunService $opService */
                $opService = app(OperationRunService::class);
                $opService->failRun($this->operationRun, $throwable);
            }

            $this->notifyFailed(
                initiator: $initiator,
                tenant: $tenant instanceof Tenant ? $tenant : null,
                reason: $bulkOperationService->sanitizeFailureReason($throwable->getMessage()),
            );

            throw $throwable;
        }
    }

    private function notifyCompleted(
        ?User $initiator,
        ?Tenant $tenant,
        int $removed,
        int $requested,
        int $missing,
        ?string $outcome,
    ): void {
        if (! $initiator instanceof User) {
            return;
        }

        if (! $this->operationRun) {
            return;
        }

        $message = "Removed {$removed} policies";

        if ($missing > 0) {
            $message .= " ({$missing} missing)";
        }

        if ($requested !== $removed && $missing === 0) {
            $skipped = max(0, $requested - $removed);
            if ($skipped > 0) {
                $message .= " ({$skipped} not removed)";
            }
        }

        $message .= '.';

        $partial = in_array((string) $outcome, ['partially_succeeded'], true) || $missing > 0;
        $failed = in_array((string) $outcome, ['failed'], true);

        $notification = Notification::make()
            ->title($failed ? 'Removal failed' : ($partial ? 'Removal completed (partial)' : 'Removal completed'))
            ->body($message);

        if ($tenant instanceof Tenant) {
            $notification->actions([
                \Filament\Actions\Action::make('view_run')
                    ->label('View run')
                    ->url(OperationRunLinks::view($this->operationRun, $tenant)),
            ]);
        }

        if ($failed) {
            $notification->danger();
        } elseif ($partial) {
            $notification->warning();
        } else {
            $notification->success();
        }

        $notification
            ->sendToDatabase($initiator)
            ->send();
    }

    private function notifyFailed(?User $initiator, ?Tenant $tenant, string $reason): void
    {
        if (! $initiator instanceof User) {
            return;
        }

        if (! $this->operationRun) {
            return;
        }

        $notification = Notification::make()
            ->title('Removal failed')
            ->body($reason);

        if ($tenant instanceof Tenant) {
            $notification->actions([
                \Filament\Actions\Action::make('view_run')
                    ->label('View run')
                    ->url(OperationRunLinks::view($this->operationRun, $tenant)),
            ]);
        }

        $notification
            ->danger()
            ->sendToDatabase($initiator)
            ->send();
    }
}