<?php

namespace App\Jobs;

use App\Models\BackupItem;
use App\Models\BackupSet;
use App\Models\BulkOperationRun;
use App\Models\Policy;
use App\Services\BulkOperationService;
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 BulkPolicyExportJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    public function __construct(
        public int $bulkRunId,
        public string $backupName,
        public ?string $backupDescription = null
    ) {}

    public function handle(BulkOperationService $service): void
    {
        $run = BulkOperationRun::with('user')->find($this->bulkRunId);

        if (! $run || $run->status !== 'pending') {
            return;
        }

        $service->start($run);

        try {
            // Create Backup Set
            $backupSet = BackupSet::create([
                'tenant_id' => $run->tenant_id,
                'name' => $this->backupName,
                // 'description' => $this->backupDescription, // Not in schema
                'status' => 'completed',
                'created_by' => $run->user?->name ?? (string) $run->user_id, // Schema has created_by string
                'item_count' => count($run->item_ids),
                'completed_at' => now(),
            ]);

            $itemCount = 0;
            $succeeded = 0;
            $failed = 0;
            $failures = [];
            $chunkSize = max(1, (int) config('tenantpilot.bulk_operations.chunk_size', 10));

            $totalItems = $run->total_items ?: count($run->item_ids ?? []);
            $failureThreshold = (int) floor($totalItems / 2);

            foreach ($run->item_ids as $policyId) {
                $itemCount++;

                try {
                    $policy = Policy::find($policyId);

                    if (! $policy) {
                        $service->recordFailure($run, (string) $policyId, 'Policy not found');
                        $failed++;
                        $failures[] = [
                            'item_id' => (string) $policyId,
                            'reason' => 'Policy not found',
                            'timestamp' => now()->toIso8601String(),
                        ];

                        if ($failed > $failureThreshold) {
                            $backupSet->update(['status' => 'failed']);
                            $service->abort($run, 'Circuit breaker: more than 50% of items failed.');

                            if ($run->user) {
                                Notification::make()
                                    ->title('Bulk Export Aborted')
                                    ->body('Circuit breaker triggered: too many failures (>50%).')
                                    ->icon('heroicon-o-exclamation-triangle')
                                    ->danger()
                                    ->sendToDatabase($run->user)
                                    ->send();
                            }

                            return;
                        }

                        continue;
                    }

                    // Get latest version for snapshot
                    $latestVersion = $policy->versions()->orderByDesc('captured_at')->first();

                    if (! $latestVersion) {
                        $service->recordFailure($run, (string) $policyId, 'No versions available for policy');
                        $failed++;
                        $failures[] = [
                            'item_id' => (string) $policyId,
                            'reason' => 'No versions available for policy',
                            'timestamp' => now()->toIso8601String(),
                        ];

                        if ($failed > $failureThreshold) {
                            $backupSet->update(['status' => 'failed']);
                            $service->abort($run, 'Circuit breaker: more than 50% of items failed.');

                            if ($run->user) {
                                Notification::make()
                                    ->title('Bulk Export Aborted')
                                    ->body('Circuit breaker triggered: too many failures (>50%).')
                                    ->icon('heroicon-o-exclamation-triangle')
                                    ->danger()
                                    ->sendToDatabase($run->user)
                                    ->send();
                            }

                            return;
                        }

                        continue;
                    }

                    // Create Backup Item
                    BackupItem::create([
                        'tenant_id' => $run->tenant_id,
                        'backup_set_id' => $backupSet->id,
                        'policy_id' => $policy->id,
                        'policy_identifier' => $policy->external_id, // Added
                        'policy_type' => $policy->policy_type,
                        'platform' => $policy->platform ?? null, // Added
                        // 'display_name' => $policy->display_name, // Not in schema, maybe in metadata?
                        'payload' => $latestVersion->snapshot, // Mapped to payload
                        'metadata' => [
                            'display_name' => $policy->display_name, // Stored in metadata
                            'version_captured_at' => $latestVersion->captured_at->toIso8601String(),
                        ],
                    ]);

                    $service->recordSuccess($run);
                    $succeeded++;

                } catch (Throwable $e) {
                    $service->recordFailure($run, (string) $policyId, $e->getMessage());
                    $failed++;
                    $failures[] = [
                        'item_id' => (string) $policyId,
                        'reason' => $e->getMessage(),
                        'timestamp' => now()->toIso8601String(),
                    ];

                    if ($failed > $failureThreshold) {
                        $backupSet->update(['status' => 'failed']);
                        $service->abort($run, 'Circuit breaker: more than 50% of items failed.');

                        if ($run->user) {
                            Notification::make()
                                ->title('Bulk Export Aborted')
                                ->body('Circuit breaker triggered: too many failures (>50%).')
                                ->icon('heroicon-o-exclamation-triangle')
                                ->danger()
                                ->sendToDatabase($run->user)
                                ->send();
                        }

                        return;
                    }
                }

                // Refresh the run from database every 10 items to avoid stale data
                if ($itemCount % $chunkSize === 0) {
                    $run->refresh();
                }
            }

            // Update BackupSet item count (if denormalized) or just leave it
            // Assuming BackupSet might need an item count or status update

            $service->complete($run);

            if ($succeeded > 0 || $failed > 0) {
                $message = "Successfully exported {$succeeded} policies to backup '{$this->backupName}'";
                if ($failed > 0) {
                    $message .= " ({$failed} failed)";
                }
                $message .= '.';

                Notification::make()
                    ->title('Bulk Export Completed')
                    ->body($message)
                    ->icon('heroicon-o-check-circle')
                    ->success()
                    ->sendToDatabase($run->user)
                    ->send();
            }

        } catch (Throwable $e) {
            $service->fail($run, $e->getMessage());

            // Reload run with user relationship
            $run->refresh();
            $run->load('user');

            if ($run->user) {
                Notification::make()
                    ->title('Bulk Export Failed')
                    ->body($e->getMessage())
                    ->icon('heroicon-o-x-circle')
                    ->danger()
                    ->sendToDatabase($run->user)
                    ->send();
            }

            throw $e;
        }
    }
}