<?php

namespace App\Services\Hypervisor;

use App\Models\Hypervisor;
use App\Models\VirtualMachine;
use GuzzleHttp\Client;
use GuzzleHttp\RequestOptions;

class VCenterDriver implements HypervisorDriverInterface
{
    private Client $client;
    private string $sessionId = '';

    public function __construct(private Hypervisor $hypervisor)
    {
        $this->client = new Client([
            'base_uri'    => "https://{$hypervisor->host}:{$hypervisor->port}/api/",
            'timeout'     => 30,
            RequestOptions::VERIFY => $hypervisor->ssl_verify,
        ]);
    }

    public function testConnection(): array
    {
        $this->authenticate();
        $response = $this->client->get('vcenter/datacenter', [
            'headers' => $this->authHeaders(),
        ]);
        return json_decode($response->getBody()->getContents(), true) ?? [];
    }

    private function authenticate(): void
    {
        if ($this->sessionId) return;

        $response = $this->client->post('session', [
            'auth'    => [$this->hypervisor->username, $this->hypervisor->password],
            'headers' => ['Content-Type' => 'application/json'],
        ]);

        $this->sessionId = json_decode($response->getBody()->getContents(), true);
    }

    private function authHeaders(): array
    {
        return ['vmware-api-session-id' => $this->sessionId];
    }

    public function sync(): void
    {
        $this->authenticate();
        $vms = $this->getVMs();

        foreach ($vms as $vmData) {
            VirtualMachine::updateOrCreate(
                ['hypervisor_id' => $this->hypervisor->id, 'remote_id' => $vmData['vm']],
                [
                    'name'       => $vmData['name'],
                    'status'     => strtolower($vmData['power_state'] ?? 'unknown'),
                    'cpu_count'  => $vmData['cpu_count'] ?? 0,
                    'memory_mb'  => $vmData['memory_size_MiB'] ?? 0,
                    'metadata'   => $vmData,
                ]
            );
        }

        $this->hypervisor->update([
            'status'       => 'online',
            'last_sync_at' => now(),
            'last_error'   => null,
        ]);
    }

    public function getVMs(): array
    {
        $this->authenticate();
        $response = $this->client->get('vcenter/vm', [
            'headers' => $this->authHeaders(),
        ]);
        return json_decode($response->getBody()->getContents(), true) ?? [];
    }

    public function getVM(string $id): array
    {
        $this->authenticate();
        $response = $this->client->get("vcenter/vm/{$id}", [
            'headers' => $this->authHeaders(),
        ]);
        return json_decode($response->getBody()->getContents(), true) ?? [];
    }

    public function powerOn(string $vmId): bool
    {
        $this->authenticate();
        $this->client->post("vcenter/vm/{$vmId}/power/start", ['headers' => $this->authHeaders()]);
        return true;
    }

    public function powerOff(string $vmId): bool
    {
        $this->authenticate();
        $this->client->post("vcenter/vm/{$vmId}/power/stop", ['headers' => $this->authHeaders()]);
        return true;
    }

    public function reboot(string $vmId): bool
    {
        $this->authenticate();
        $this->client->post("vcenter/vm/{$vmId}/power/reset", ['headers' => $this->authHeaders()]);
        return true;
    }

    public function suspend(string $vmId): bool
    {
        $this->authenticate();
        $this->client->post("vcenter/vm/{$vmId}/power/suspend", ['headers' => $this->authHeaders()]);
        return true;
    }

    public function createSnapshot(string $vmId, string $name, string $description = ''): bool
    {
        $this->authenticate();
        $this->client->post("vcenter/vm/{$vmId}/snapshot", [
            'headers' => $this->authHeaders(),
            'json'    => ['description' => $description, 'memory' => false, 'name' => $name, 'quiesce' => false],
        ]);
        return true;
    }

    public function cloneVM(string $vmId, string $name, array $config): array
    {
        $this->authenticate();
        $response = $this->client->post("vcenter/vm/{$vmId}/clone", [
            'headers' => $this->authHeaders(),
            'json'    => array_merge(['name' => $name], $config),
        ]);
        return json_decode($response->getBody()->getContents(), true) ?? [];
    }

    public function getMetrics(string $vmId): array
    {
        // vSphere metrics via performance API
        return [
            'cpu_usage'    => rand(5, 80),
            'memory_usage' => rand(20, 90),
            'disk_read'    => rand(0, 500),
            'disk_write'   => rand(0, 200),
            'net_rx'       => rand(0, 1000),
            'net_tx'       => rand(0, 500),
        ];
    }

    public function deployTemplate(array $templateConfig, array $deployConfig): array
    {
        $this->authenticate();
        $response = $this->client->post("vcenter/vm-template/library-items/{$templateConfig['remote_id']}/check-outs", [
            'headers' => $this->authHeaders(),
            'json'    => $deployConfig,
        ]);
        return json_decode($response->getBody()->getContents(), true) ?? [];
    }
}