<?php

declare(strict_types=1);

namespace App\Services\VirtualMachine;

use App\Repositories\Setting\SettingRepositoryInterface;

/**
 * Reads / writes the provisioning "provider" config stored in setting table
 * under the single key `provider`.
 *
 * Shape:
 *   {
 *     "active_vcenter_id": 1,                 // mirror of module_vcenter.status=1
 *     "default_folder": "group-v1008",
 *     "default_resource_pool": "resgroup-3002",
 *     "default_datastore": "datastore-3004",  // fallback if active host has no active datastore
 *     "name": "Acme Cloud",
 *     "region": "HCM",
 *     "tags": ["prod"]
 *   }
 *
 * The active_vcenter_id field is mirrored from module_vcenter — module_vcenter
 * remains the source of truth, this is just a convenience view for the UI.
 */
class VmProviderSettingsService
{
    public const KEY = 'provider';

    public const DEFAULTS = [
        'active_vcenter_id'    => null,
        'default_folder'       => 'group-v1008',
        'default_resource_pool' => 'resgroup-3002',
        'default_datastore'    => 'datastore-3004',
        'name'                 => null,
        'region'               => null,
        'tags'                 => [],
    ];

    public function __construct(private readonly SettingRepositoryInterface $settings)
    {
    }

    /** @return array<string,mixed> */
    public function all(): array
    {
        $raw = $this->settings->getByKey(self::KEY);
        $data = is_string($raw) ? json_decode($raw, true) : [];
        return array_merge(self::DEFAULTS, is_array($data) ? $data : []);
    }

    public function get(string $field, mixed $default = null): mixed
    {
        return $this->all()[$field] ?? $default;
    }

    /** Merge-write a subset of fields. */
    public function merge(array $patch): array
    {
        $merged = array_merge($this->all(), $patch);
        $this->settings->updateOrCreateByKey(self::KEY, [
            'value' => json_encode($merged, JSON_UNESCAPED_UNICODE),
        ]);
        return $merged;
    }

    public function setActiveVcenterId(?int $id): void
    {
        $this->merge(['active_vcenter_id' => $id]);
    }

    public function defaultFolder(): string
    {
        return (string) $this->get('default_folder', self::DEFAULTS['default_folder']);
    }

    public function defaultResourcePool(): string
    {
        return (string) $this->get('default_resource_pool', self::DEFAULTS['default_resource_pool']);
    }

    public function defaultDatastore(): string
    {
        return (string) $this->get('default_datastore', self::DEFAULTS['default_datastore']);
    }
}