<?php

namespace App\Services\Admin;

use App\Mail\OperationalAccountCreatedMail;
use App\Models\Application;
use App\Models\Position;
use App\Models\StaffAssignment;
use App\Models\User;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Mail;
use Illuminate\Support\Str;

class OperationalAccountService
{
    private const ROLES_NEEDING_ACCOUNT = ['PPM', 'KTM'];

    public function provisionForApplication(Application $application, Position $position): void
    {
        if (! in_array($position->code, self::ROLES_NEEDING_ACCOUNT, true)) {
            return;
        }

        if (! $application->email) {
            return;
        }

        [$user, $tempPassword] = $this->findOrCreateUser($application->name, $application->email);

        // Link user to application if not already linked
        if ($application->user_id !== $user->id) {
            $application->forceFill(['user_id' => $user->id])->save();
        }

        $user->assignRole($position->code);

        if ($tempPassword !== null) {
            Mail::to($user->email)->queue(
                new OperationalAccountCreatedMail($user, $position->code, $tempPassword)
            );
        }
    }

    public function provisionForAssignment(StaffAssignment $assignment, Position $position): void
    {
        if (! in_array($position->code, self::ROLES_NEEDING_ACCOUNT, true)) {
            return;
        }

        $application = $assignment->application;

        if ($application) {
            $this->provisionForApplication($application, $position);

            // Re-link user_id on assignment after provisioning
            $assignment->loadMissing('application');
            if ($assignment->application?->user_id && $assignment->user_id !== $assignment->application->user_id) {
                $assignment->forceFill(['user_id' => $assignment->application->user_id])->save();
            }

            return;
        }

        // Assignment without application (direct assignment) — skip provisioning
    }

    /**
     * @return array{User, string|null}  [$user, $tempPassword|null]
     */
    private function findOrCreateUser(string $name, string $email): array
    {
        $existing = User::query()->where('email', $email)->first();

        if ($existing) {
            return [$existing, null];
        }

        $tempPassword = Str::random(10);

        $user = User::query()->create([
            'name'              => $name,
            'email'             => $email,
            'password'          => Hash::make($tempPassword),
            'email_verified_at' => now(),
        ]);

        return [$user, $tempPassword];
    }
}