<?php

namespace App\Services;

use App\Models\Requisition;
use App\Models\User;

/** Read the existing approval queue; never assign authority or change the workflow. */
class ApprovalRouting
{
    /** @return array<string,mixed> */
    public function current(Requisition $requisition, User $viewer): array
    {
        abort_unless($viewer->tenant_id === $requisition->tenant_id, 404);
        Requisition::query()->visibleTo($viewer)->findOrFail($requisition->id);
        $step = $requisition->status === 'pending' ? $requisition->steps->firstWhere('decision', 'pending') : null;
        if ($step === null) {
            return ['status' => 'inactive', 'step_id' => null, 'role' => null, 'people' => [], 'checked_at' => now()->toIso8601String()];
        }
        $people = [];
        foreach (User::query()->where('tenant_id', $requisition->tenant_id)->orderBy('name')->orderBy('id')->get() as $person) {
            if (! app(OrganizationAccess::class)->maintenanceOnly($person) && $requisition->canDecide($person)) {
                $people[] = $person->only(['id', 'name']);
            }
        }

        return ['status' => $people === [] ? 'unavailable' : 'available', 'step_id' => $step->id, 'role' => $step->role,
            'task_key' => 'requisition.approve.'.$step->role,
            'people' => $people, 'checked_at' => now()->toIso8601String()];
    }
}