<?php
/**
 * Shared AI image job runner.
 *
 * Used by admin/api.php and the local CLI worker so long-running image
 * generation does not have to occupy the PHP built-in web server request.
 */

function raijuAiRunImageJobCore(string $jobId, ?callable $assertAccess = null): array {
    $job = raijuAiRefreshImageJobState(raijuAiLoadImageJob($jobId));
    if ($assertAccess) $assertAccess($job);
    $worker = fopen(raijuAiImageJobPath($jobId) . '.worker.lock', 'c');
    if (!$worker) throw new RuntimeException('Could not lock image worker.');
    if (!flock($worker, LOCK_EX | LOCK_NB)) { fclose($worker); return raijuAiPublicImageJob($job); }
    try { return raijuAiRunImageJobClaimed($jobId, $assertAccess); }
    finally { flock($worker, LOCK_UN); fclose($worker); }
}

function raijuAiRunImageJobClaimed(string $jobId, ?callable $assertAccess = null): array {
    $existingJob = raijuAiLoadImageJob($jobId);
    if ($assertAccess) {
        $assertAccess($existingJob);
    }
    if ((string)($existingJob['status'] ?? '') === 'running') {
        return raijuAiPublicImageJob($existingJob);
    }
    if (in_array((string)($existingJob['status'] ?? ''), ['success', 'error'], true)) {
        return raijuAiPublicImageJob($existingJob);
    }
    $claimed = false;
    $job = raijuAiMarkImageJobRunning($jobId, $claimed);
    if (!$claimed) {
        return raijuAiPublicImageJob($job);
    }

    $payload = is_array($job['payload'] ?? null) ? $job['payload'] : [];
    $options = is_array($payload['options'] ?? null) ? $payload['options'] : [];
    $options['_requestId'] = 'image_' . $jobId;
    $prompt = trim((string)($payload['prompt'] ?? ''));
    $kind = (string)($job['kind'] ?? 'dashboard');

    try {
        if ($kind === 'copilot') {
            $contentPage = trim((string)($payload['contentPage'] ?? ''));
            $fieldRef = trim((string)($payload['fieldRef'] ?? ''));
            $instruction = trim((string)($payload['instruction'] ?? ''));
            if ($contentPage === '' || $fieldRef === '' || $instruction === '' || $prompt === '') {
                throw new RuntimeException('Image job is missing required copilot data.');
            }
            $settings = raijuAiLoadSettings(false);
            raijuAiEnsureImageReady($settings, raijuAiImageServiceResolve($settings));
            $context = raijuCopilotBuildContext($contentPage, raijuAiLoadSettings(true));
            $fields = raijuCopilotAllowedImageFields($context, $fieldRef);
            if (!$fields) {
                throw new RuntimeException('Target field does not accept AI image generation.');
            }
            $field = $fields[0];
            $result = raijuAiGenerateImage($prompt, $options);
            $proposal = raijuCopilotImageProposal($context, $field['id'], $instruction, $result);
            raijuAiAudit('copilot-generate-image', true, [
                'jobId' => $jobId,
                'contentPage' => $contentPage,
                'path' => $proposal['path'],
                'imageMode' => (string)($payload['imageMode'] ?? 'generate'),
                'requestedCount' => (int)($options['count'] ?? 1),
                'count' => count($proposal['paths'] ?? []),
                'proposals' => raijuCopilotProposalAuditSummary([$proposal])
            ]);
            return raijuAiFinishImageJob($jobId, [
                'proposal' => $proposal,
                'usage' => $result['usage'] ?? null,
                'limits' => $result['limits'] ?? null,
                'context' => $context
            ]);
        }

        if ($prompt === '') {
            throw new RuntimeException('Image job prompt is missing.');
        }
        if ($kind === 'agent' && empty($options['storageDir'])) {
            throw new RuntimeException('An agent image job needs its staging folder.');
        }
        $result = raijuAiGenerateImage($prompt, $options);
        return raijuAiFinishImageJob($jobId, $result);
    } catch (Throwable $e) {
        $entry = raijuAiLoadUsage()['reservations']['image_' . $jobId] ?? [];
        $tasks = $entry['tasks'] ?? [];
        $pending = array_filter($tasks, fn($task) => !in_array($task['state'] ?? '', ['success', 'fail', 'failed', 'error'], true));
        if ($tasks && !array_filter($tasks, fn($task) => empty($task['id'])) && ($pending || !empty($entry['outputs'])) && (int)($job['attempts'] ?? 0) < 10) {
            raijuJsonUpdate(raijuAiImageJobPath($jobId), static function (&$current) use ($e) {
                $current['status'] = 'queued';
                $current['retryAt'] = time() + 60;
                $current['updatedAt'] = gmdate('c');
                $current['error'] = raijuAiUtf8Prefix($e->getMessage(), 1000);
            });
            return raijuAiPublicImageJob(raijuAiLoadImageJob($jobId));
        }
        if ($kind === 'dashboard') {
            $settings = raijuAiLoadSettings(false);
            raijuAiRecordImageHistory([
                'status' => 'error',
                'model' => (string)($options['model'] ?? raijuAiEffectiveImageModel($settings)),
                'prompt' => $prompt,
                'size' => (string)($options['size'] ?? ''),
                'aspectRatio' => (string)($options['aspectRatio'] ?? ''),
                'quality' => (string)($options['quality'] ?? ''),
                'format' => (string)($options['outputFormat'] ?? ''),
                'moderation' => (string)($options['moderation'] ?? ''),
                'compression' => (int)($options['outputCompression'] ?? 0),
                'count' => (int)($options['count'] ?? 0),
                'referenceImages' => raijuAiPublicReferenceList($options),
                'outputs' => [],
                'error' => $e->getMessage(),
                'estimatedCostCents' => 0
            ]);
        }
        raijuAiAudit($kind === 'copilot' ? 'copilot-generate-image' : 'image', false, ['jobId' => $jobId, 'message' => $e->getMessage()]);
        return raijuAiFailImageJob($jobId, $e->getMessage());
    }
}