<?php

declare(strict_types=1);

namespace App\Support\OpsUx;

use App\Models\OperationRun;
use App\Models\Tenant;
use App\Support\OperationCatalog;
use App\Support\ReasonTranslation\ReasonPresenter;
use App\Support\RedactionIntegrity;
use Filament\Notifications\Notification as FilamentNotification;

final class OperationUxPresenter
{
    public const int QUEUED_TOAST_DURATION_MS = 4000;

    public const int FAILURE_MESSAGE_MAX_CHARS = 140;

    /**
     * Queued intent feedback toast (ephemeral, not persisted).
     */
    public static function queuedToast(string $operationType): FilamentNotification
    {
        $operationLabel = OperationCatalog::label($operationType);

        return FilamentNotification::make()
            ->title("{$operationLabel} queued")
            ->body('Queued for execution. Open the run for progress and next steps.')
            ->info()
            ->duration(self::QUEUED_TOAST_DURATION_MS);
    }

    /**
     * Canonical dedupe feedback when a matching run is already active.
     */
    public static function alreadyQueuedToast(string $operationType): FilamentNotification
    {
        $operationLabel = OperationCatalog::label($operationType);

        return FilamentNotification::make()
            ->title("{$operationLabel} already queued")
            ->body('A matching run is already queued or running. No action needed unless it stays stuck.')
            ->info()
            ->duration(self::QUEUED_TOAST_DURATION_MS);
    }

    /**
     * Terminal DB notification payload.
     *
     * Note: We intentionally return the built Filament notification builder to
     * keep DB formatting consistent with existing Notification classes.
     */
    public static function terminalDatabaseNotification(OperationRun $run, ?Tenant $tenant = null): FilamentNotification
    {
        $operationLabel = OperationCatalog::label((string) $run->type);
        $presentation = self::terminalPresentation($run);
        $bodyLines = [$presentation['body']];

        $failureMessage = self::surfaceFailureDetail($run);
        if ($failureMessage !== null) {
            $bodyLines[] = $failureMessage;
        }

        $guidance = self::surfaceGuidance($run);
        if ($guidance !== null) {
            $bodyLines[] = $guidance;
        }

        $summary = SummaryCountsNormalizer::renderSummaryLine(is_array($run->summary_counts) ? $run->summary_counts : []);
        if ($summary !== null) {
            $bodyLines[] = $summary;
        }

        $integritySummary = RedactionIntegrity::noteForRun($run);
        if (is_string($integritySummary) && trim($integritySummary) !== '') {
            $bodyLines[] = trim($integritySummary);
        }

        $notification = FilamentNotification::make()
            ->title("{$operationLabel} {$presentation['titleSuffix']}")
            ->body(implode("\n", $bodyLines))
            ->status($presentation['status']);

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

        return $notification;
    }

    public static function surfaceGuidance(OperationRun $run): ?string
    {
        $uxStatus = OperationStatusNormalizer::toUxStatus($run->status, $run->outcome);
        $reasonEnvelope = self::reasonEnvelope($run);
        $reasonGuidance = app(ReasonPresenter::class)->guidance($reasonEnvelope);
        $nextStepLabel = self::firstNextStepLabel($run);

        if (in_array($uxStatus, ['blocked', 'failed', 'partial'], true) && $reasonGuidance !== null) {
            return $reasonGuidance;
        }

        return match ($uxStatus) {
            'queued' => 'No action needed yet. The run is waiting for a worker.',
            'running' => 'No action needed yet. The run is currently in progress.',
            'succeeded' => 'No action needed.',
            'partial' => $nextStepLabel !== null
                ? 'Next step: '.$nextStepLabel.'.'
                : (self::requiresFollowUp($run)
                    ? 'Review the affected items before rerunning.'
                    : 'No action needed unless the recorded warnings were unexpected.'),
            'blocked' => $nextStepLabel !== null
                ? 'Next step: '.$nextStepLabel.'.'
                : 'Review the blocked prerequisite before retrying.',
            default => $nextStepLabel !== null
                ? 'Next step: '.$nextStepLabel.'.'
                : 'Review the run details before retrying.',
        };
    }

    public static function surfaceFailureDetail(OperationRun $run): ?string
    {
        $reasonEnvelope = self::reasonEnvelope($run);

        if ($reasonEnvelope !== null) {
            return $reasonEnvelope->shortExplanation;
        }

        $failureMessage = (string) (($run->failure_summary[0]['message'] ?? '') ?? '');

        return self::sanitizeFailureMessage($failureMessage);
    }

    /**
     * @return array{titleSuffix: string, body: string, status: string}
     */
    private static function terminalPresentation(OperationRun $run): array
    {
        $uxStatus = OperationStatusNormalizer::toUxStatus($run->status, $run->outcome);
        $reasonEnvelope = self::reasonEnvelope($run);

        return match ($uxStatus) {
            'succeeded' => [
                'titleSuffix' => 'completed successfully',
                'body' => 'Completed successfully.',
                'status' => 'success',
            ],
            'partial' => [
                'titleSuffix' => self::requiresFollowUp($run) ? 'needs follow-up' : 'completed with review notes',
                'body' => 'Completed with follow-up.',
                'status' => 'warning',
            ],
            'blocked' => [
                'titleSuffix' => 'blocked by prerequisite',
                'body' => $reasonEnvelope?->operatorLabel ?? 'Blocked by prerequisite.',
                'status' => 'warning',
            ],
            default => [
                'titleSuffix' => 'execution failed',
                'body' => $reasonEnvelope?->operatorLabel ?? 'Execution failed.',
                'status' => 'danger',
            ],
        };
    }

    private static function requiresFollowUp(OperationRun $run): bool
    {
        if (self::firstNextStepLabel($run) !== null) {
            return true;
        }

        $counts = SummaryCountsNormalizer::normalize(is_array($run->summary_counts) ? $run->summary_counts : []);

        return (int) ($counts['failed'] ?? 0) > 0;
    }

    private static function firstNextStepLabel(OperationRun $run): ?string
    {
        $context = is_array($run->context) ? $run->context : [];
        $nextSteps = $context['next_steps'] ?? null;

        if (! is_array($nextSteps)) {
            return null;
        }

        foreach ($nextSteps as $nextStep) {
            if (! is_array($nextStep)) {
                continue;
            }

            $label = trim((string) ($nextStep['label'] ?? ''));

            if ($label !== '') {
                return $label;
            }
        }

        return null;
    }

    private static function sanitizeFailureMessage(string $failureMessage): ?string
    {
        $failureMessage = trim($failureMessage);

        if ($failureMessage === '') {
            return null;
        }

        $failureMessage = RunFailureSanitizer::sanitizeMessage($failureMessage);

        if (mb_strlen($failureMessage) > self::FAILURE_MESSAGE_MAX_CHARS) {
            $failureMessage = mb_substr($failureMessage, 0, self::FAILURE_MESSAGE_MAX_CHARS - 1).'…';
        }

        return $failureMessage !== '' ? $failureMessage : null;
    }

    private static function reasonEnvelope(OperationRun $run): ?\App\Support\ReasonTranslation\ReasonResolutionEnvelope
    {
        return app(ReasonPresenter::class)->forOperationRun($run, 'notification');
    }
}