<?php

declare(strict_types=1);

namespace App\Support\Operations\Reconciliation;

use App\Models\BackupSchedule;
use App\Models\BackupSet;
use App\Models\OperationRun;
use App\Support\OperationCatalog;
use App\Support\OperationRunOutcome;
use App\Support\OperationRunStatus;
use App\Support\OperationRunType;
use App\Support\Operations\LifecycleReconciliationReason;
use Throwable;

final class BackupScheduleExecutionReconciliationAdapter implements OperationRunReconciliationAdapter
{
    public function key(): string
    {
        return 'backup_schedule_execution';
    }

    public function supportedTypes(): array
    {
        return [OperationRunType::BackupScheduleExecute->value];
    }

    public function supportsType(string $type): bool
    {
        return OperationCatalog::canonicalCode($type) === OperationRunType::BackupScheduleExecute->value;
    }

    public function reconcile(OperationRun $run): ?ReconciliationResult
    {
        if (! $this->supportsType((string) $run->type)) {
            return ReconciliationResult::unsupported(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'This adapter only supports backup schedule execution runs.',
                evidence: [
                    'adapter' => $this->key(),
                    'type' => (string) $run->type,
                ],
            );
        }

        $context = is_array($run->context) ? $run->context : [];
        $scheduleId = is_numeric($context['backup_schedule_id'] ?? null) ? (int) $context['backup_schedule_id'] : null;
        $backupSetId = is_numeric($context['backup_set_id'] ?? null) ? (int) $context['backup_set_id'] : null;

        $evidence = [
            'adapter' => $this->key(),
            'operation_run_id' => (int) $run->getKey(),
            'workspace_id' => (int) $run->workspace_id,
            'managed_environment_id' => (int) $run->managed_environment_id,
            'backup_schedule_id' => $scheduleId,
            'backup_set_id' => $backupSetId,
        ];

        [$backupSet, $scopeProblem] = $this->resolveBackupSet($run, $backupSetId);

        if ($scopeProblem !== null) {
            return ReconciliationResult::notReconciled(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: $scopeProblem,
                evidence: $evidence,
            );
        }

        if ($backupSet instanceof BackupSet) {
            $failures = is_array($backupSet->metadata['failures'] ?? null) ? $backupSet->metadata['failures'] : [];
            $failureCount = count($failures);
            $itemCount = max(0, (int) ($backupSet->item_count ?? 0));
            $summaryCounts = [
                'total' => $itemCount + $failureCount,
                'processed' => $itemCount + $failureCount,
                'succeeded' => $itemCount,
                'failed' => $failureCount,
                'created' => 1,
                'updated' => $itemCount,
                'items' => $itemCount + $failureCount,
            ];
            $related = [
                'type' => 'backup_set',
                'id' => (int) $backupSet->getKey(),
                'status' => (string) $backupSet->status,
                'item_count' => $itemCount,
            ];

            if ((string) $backupSet->status === 'completed' && $failureCount === 0) {
                return ReconciliationResult::reconciledSucceeded(
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'The backup schedule already produced a complete backup set before the run finished updating.',
                    evidence: $evidence + ['chosen_backup_set_id' => (int) $backupSet->getKey()],
                    related: $related,
                    summaryCounts: $summaryCounts,
                );
            }

            if ($itemCount > 0 && ((string) $backupSet->status === 'partial' || $failureCount > 0)) {
                return new ReconciliationResult(
                    decision: 'reconciled_partially_succeeded',
                    status: OperationRunStatus::Completed->value,
                    outcome: OperationRunOutcome::PartiallySucceeded->value,
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'The backup schedule produced a usable backup set, but some captures did not finish cleanly.',
                    evidence: $evidence + ['chosen_backup_set_id' => (int) $backupSet->getKey()],
                    related: $related,
                    summaryCounts: $summaryCounts,
                    failures: [[
                        'code' => 'backup_schedule.partial',
                        'reason_code' => LifecycleReconciliationReason::AdapterOutOfSync->value,
                        'message' => 'The backup schedule produced a usable backup set, but some captures did not finish cleanly.',
                    ]],
                    safeForAutoCompletion: true,
                );
            }

            if ((string) $backupSet->status === 'failed') {
                return ReconciliationResult::failedUnrecoverable(
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'The backup schedule produced no usable backup set before the run stopped updating.',
                    evidence: $evidence + ['chosen_backup_set_id' => (int) $backupSet->getKey()],
                    related: $related,
                    summaryCounts: $summaryCounts,
                );
            }

            return ReconciliationResult::notReconciled(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'The related backup set is still being prepared and does not prove final backup truth yet.',
                evidence: $evidence + ['chosen_backup_set_id' => (int) $backupSet->getKey()],
                related: $related,
            );
        }

        $schedule = $scheduleId !== null
            ? BackupSchedule::query()->withTrashed()->whereKey($scheduleId)->where('managed_environment_id', (int) $run->managed_environment_id)->first()
            : null;

        if ($schedule instanceof BackupSchedule && $schedule->trashed()) {
            return ReconciliationResult::blocked(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'The backup schedule is archived, so this run never produced a current backup set.',
                evidence: $evidence,
                summaryCounts: [
                    'total' => 0,
                    'processed' => 0,
                    'succeeded' => 0,
                    'failed' => 0,
                    'skipped' => 1,
                ],
            );
        }

        return ReconciliationResult::notReconciled(
            reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
            reasonMessage: 'No current backup set proof is available yet for this backup schedule run.',
            evidence: $evidence,
        );
    }

    public function reconcileException(OperationRun $run, Throwable $throwable): ?ReconciliationResult
    {
        return null;
    }

    /**
     * @return array{0:BackupSet|null,1:?string}
     */
    private function resolveBackupSet(OperationRun $run, ?int $backupSetId): array
    {
        if ($backupSetId === null) {
            return [null, null];
        }

        $candidate = BackupSet::query()->whereKey($backupSetId)->first();

        if (! $candidate instanceof BackupSet) {
            return [null, null];
        }

        if ((int) $candidate->managed_environment_id !== (int) $run->managed_environment_id) {
            return [null, 'The recorded backup set no longer matches the queued backup schedule scope safely.'];
        }

        return [$candidate, null];
    }
}