<?php

namespace App\Livewire\Admin;

use App\Models\Datacenter;
use App\Models\Host;
use Illuminate\Support\Facades\DB;
use LivewireUI\Modal\ModalComponent;

/**
 * Confirmation for deleting a datacenter (R5). Guarded: a datacenter that still
 * has hosts cannot be deleted — it would orphan host placement — so the modal
 * blocks and explains instead. Otherwise it is safe to hard-delete an unused code.
 */
class ConfirmDeleteDatacenter extends ModalComponent
{
    public string $uuid;

    public string $name = '';

    public int $hostCount = 0;

    public function mount(string $uuid): void
    {
        $dc = Datacenter::query()->where('uuid', $uuid)->withCount('hosts')->firstOrFail();
        $this->uuid = $uuid;
        $this->name = $dc->name;
        $this->hostCount = $dc->hosts_count;
    }

    public function delete()
    {
        // Serialize the guard with the delete: lock the datacenter row and
        // re-check host membership inside the same transaction so a host created
        // concurrently can't be orphaned (hosts.datacenter is a bare code).
        DB::transaction(function () {
            $dc = Datacenter::query()->where('uuid', $this->uuid)->lockForUpdate()->first();
            if ($dc === null) {
                return;
            }
            // Deactivate first so HostCreate's `exists:…,active,1` rule blocks any
            // new host for this code while we finish deleting.
            $dc->update(['active' => false]);

            if (Host::query()->where('datacenter', $dc->code)->exists()) {
                return; // still has hosts — leave it (deactivated)
            }

            $dc->delete();
        });

        return $this->redirectRoute('admin.datacenters', navigate: true);
    }

    public function render()
    {
        return view('livewire.admin.confirm-delete-datacenter');
    }
}