<?php

if (!defined('ABSPATH')) {
    exit;
}

final class SPP_Http_Proxmox_Client implements SPP_Proxmox_Client
{
    /** @var array{base_url:string, token_id:string, token_secret:string, node:string} */
    private array $options;

    /**
     * @param array{base_url:string, token_id:string, token_secret:string, node:string} $options
     */
    public function __construct(array $options)
    {
        $this->options = $options;
    }

    public function list_templates(): array
    {
        $data = $this->request("/nodes/{$this->options['node']}/qemu", 'GET');
        $vms = is_array($data) ? $data : [];
        $templates = [];

        foreach ($vms as $vm) {
            if (!is_array($vm) || empty($vm['template']) || empty($vm['vmid'])) {
                continue;
            }

            $templates[] = [
                'vmId' => (int) $vm['vmid'],
                'name' => isset($vm['name']) && $vm['name'] !== '' ? (string) $vm['name'] : 'template-' . (int) $vm['vmid'],
                'cpuCores' => max(1, (int) ($vm['cpus'] ?? 1)),
                'memoryMb' => $this->bytes_to_mb((int) ($vm['maxmem'] ?? 0)),
                'diskGb' => $this->bytes_to_gb((int) ($vm['maxdisk'] ?? 0)),
                'status' => isset($vm['status']) ? (string) $vm['status'] : 'unknown',
            ];
        }

        usort(
            $templates,
            static fn(array $left, array $right): int => strcasecmp((string) $left['name'], (string) $right['name'])
        );

        return $templates;
    }

    public function clone_vm(array $input): array
    {
        $vm_id = (int) $this->request('/cluster/nextid', 'GET');
        $template_id = (int) $input['template_vm_id'];

        $this->request("/nodes/{$this->options['node']}/qemu/{$template_id}/clone", 'POST', [
            'newid' => $vm_id,
            'name' => (string) $input['name'],
            'full' => 1,
        ]);

        $this->request("/nodes/{$this->options['node']}/qemu/{$vm_id}/config", 'PUT', [
            'cores' => (int) $input['cpu_cores'],
            'memory' => (int) $input['memory_mb'],
        ]);

        return ['vm_id' => $vm_id];
    }

    public function start_vm(int $vm_id): void
    {
        $this->request("/nodes/{$this->options['node']}/qemu/{$vm_id}/status/start", 'POST');
    }

    public function stop_vm(int $vm_id): void
    {
        $this->request("/nodes/{$this->options['node']}/qemu/{$vm_id}/status/stop", 'POST');
    }

    public function delete_vm(int $vm_id): void
    {
        $this->request("/nodes/{$this->options['node']}/qemu/{$vm_id}", 'DELETE');
    }

    public function get_status(int $vm_id): string
    {
        $data = $this->request("/nodes/{$this->options['node']}/qemu/{$vm_id}/status/current", 'GET');

        return is_array($data) && isset($data['status']) ? (string) $data['status'] : 'unknown';
    }

    public function get_ip_addresses(int $vm_id): array
    {
        $data = $this->request("/nodes/{$this->options['node']}/qemu/{$vm_id}/agent/network-get-interfaces", 'GET');
        $interfaces = is_array($data) && isset($data['result']) && is_array($data['result']) ? $data['result'] : [];
        $ips = [];

        foreach ($interfaces as $interface) {
            if (!is_array($interface) || empty($interface['ip-addresses']) || !is_array($interface['ip-addresses'])) {
                continue;
            }

            foreach ($interface['ip-addresses'] as $address) {
                if (!is_array($address) || empty($address['ip-address'])) {
                    continue;
                }

                $ip = (string) $address['ip-address'];
                if ($ip === '127.0.0.1' || $ip === '::1' || str_starts_with($ip, 'fe80:')) {
                    continue;
                }

                $ips[] = $ip;
            }
        }

        return array_values(array_unique($ips));
    }

    private function bytes_to_mb(int $bytes): int
    {
        if ($bytes < 1) {
            return 1024;
        }

        return max(128, (int) ceil($bytes / 1048576));
    }

    private function bytes_to_gb(int $bytes): int
    {
        if ($bytes < 1) {
            return 8;
        }

        return max(1, (int) ceil($bytes / 1073741824));
    }

    /**
     * @param array<string, int|string> $body
     * @return mixed
     */
    private function request(string $path, string $method, array $body = [])
    {
        foreach (['base_url', 'token_id', 'token_secret', 'node'] as $key) {
            if ($this->options[$key] === '') {
                throw new RuntimeException('Missing Proxmox HTTP configuration.');
            }
        }

        $url = trailingslashit($this->options['base_url']) . 'api2/json' . $path;
        $response = wp_remote_request($url, [
            'method' => $method,
            'timeout' => 30,
            'headers' => [
                'Authorization' => 'PVEAPIToken=' . $this->options['token_id'] . '=' . $this->options['token_secret'],
            ],
            'body' => $body,
        ]);

        if (is_wp_error($response)) {
            throw new RuntimeException($response->get_error_message());
        }

        $status = (int) wp_remote_retrieve_response_code($response);
        if ($status < 200 || $status >= 300) {
            throw new RuntimeException('Proxmox request failed with HTTP ' . $status);
        }

        $payload = json_decode(wp_remote_retrieve_body($response), true);

        return is_array($payload) && array_key_exists('data', $payload) ? $payload['data'] : null;
    }
}