<?php

namespace App\Services\Qms;

use App\Models\ServiceQueue;
use App\Models\Ticket;
use App\Models\Workflow;
use App\Models\WorkflowStep;

class WorkflowService
{
    public function __construct(
        protected QueueEngine $engine,
    ) {}

    /**
     * @param  array<string, mixed>  $attributes
     */
    public function attachOnIssue(ServiceQueue $queue, array &$attributes): void
    {
        if (data_get($attributes, 'metadata.workflow_id')) {
            return;
        }

        $workflow = Workflow::query()
            ->where('owner_ref', $queue->owner_ref)
            ->where('organization_id', $queue->organization_id)
            ->where('is_active', true)
            ->when($queue->branch_id, fn ($q) => $q->where(fn ($inner) => $inner->whereNull('branch_id')->orWhere('branch_id', $queue->branch_id)))
            ->whereHas('steps', fn ($q) => $q->where('service_queue_id', $queue->id))
            ->first();

        if (! $workflow) {
            return;
        }

        $firstStep = $workflow->steps()
            ->where('service_queue_id', $queue->id)
            ->orderBy('sort_order')
            ->first();

        if (! $firstStep) {
            return;
        }

        $metadata = $attributes['metadata'] ?? [];
        $metadata['workflow_id'] = $workflow->id;
        $metadata['workflow_step'] = $firstStep->sort_order;
        $attributes['metadata'] = $metadata;
    }

    /** Advance completed ticket to the next workflow step queue, if configured. */
    public function advanceAfterCompletion(Ticket $ticket): ?Ticket
    {
        $workflowId = data_get($ticket->metadata, 'workflow_id');
        $stepOrder = (int) data_get($ticket->metadata, 'workflow_step', 0);

        if (! $workflowId) {
            return null;
        }

        $workflow = Workflow::find($workflowId);
        if (! $workflow || ! $workflow->is_active) {
            return null;
        }

        $nextStep = WorkflowStep::where('workflow_id', $workflow->id)
            ->where('sort_order', '>', $stepOrder)
            ->orderBy('sort_order')
            ->first();

        if (! $nextStep?->service_queue_id) {
            return null;
        }

        $toQueue = ServiceQueue::find($nextStep->service_queue_id);
        if (! $toQueue) {
            return null;
        }

        $transferred = $this->engine->transfer($ticket, $toQueue, null, 'Workflow advance', null);
        $transferred->update([
            'metadata' => array_merge($transferred->metadata ?? [], [
                'workflow_id' => $workflow->id,
                'workflow_step' => $nextStep->sort_order,
            ]),
        ]);

        return $transferred;
    }

    /**
     * @return array<int, array{name: string, queue_id: int|null, sort_order: int}>
     */
    public function industryTemplate(string $template): array
    {
        return config("qms.workflow_templates.{$template}", config('qms.workflow_templates.custom', []));
    }
}