<?php

namespace App\Services\Workflow;

use App\Domain\ACL\Permission;
use App\Domain\Report\ReportStatus;
use App\Models\Study;
use App\Models\User;
use Closure;

final class Manager
{
    private ?User $user = null;

    public function __construct(private readonly Study $study) {}

    public static function of(Study $study): self
    {
        return new self($study);
    }

    public function by(User|int|null $user): self
    {
        $this->user = me($user);

        return $this;
    }

    public function can(Permission $permission): bool
    {
        if (! $this->checkUserPermission($permission)) {
            return false;
        }

        $prop = 'can' . $permission->name;
        if (! method_exists($this, $prop)) {
            return false;
        }

        return $this->{$prop}();
    }

    public function canAssignPhysician(): bool
    {
        return $this->activeStudy(fn () => $this->study->report_status <= ReportStatus::Preliminary);
    }

    public function canStudyHistoryEdit(): bool
    {
        return $this->activeStudy(fn () => $this->study->report_status <= ReportStatus::Preliminary);
    }

    public function canAttachmentUpload(): bool
    {
        return $this->activeStudy(fn () => $this->study->report_status <= ReportStatus::Preliminary);
    }

    public function canReportDownload(): bool
    {
        return $this->activeStudy(fn () => $this->study->report_status >= ReportStatus::Finalized);
    }

    public function canReportEdit(): bool
    {
        return $this->activeStudy(fn () => $this->study->isUnlocked() &&
            $this->study->report_status <= ReportStatus::Preliminary &&
            $this->study->isAssignedTo($this->user)
        );
    }

    public function canUnlockReport(): bool
    {
        return $this->activeStudy(fn () => $this->study->isLocked() &&
            $this->study->isLockedBy($this->user)
        );
    }

    private function checkUserPermission(Permission $permission): bool
    {
        if (is_null($this->user)) {
            $this->user = auth()->user();
        }

        return $this->user->may($permission);
    }

    private function activeStudy(Closure $fn): bool
    {
        if (! $this->study->isActive()) {
            return false;
        }

        return $fn();
    }
}