<?php

namespace App\Services\Infrastructure;

use App\Models\ContaboInfrastructureProvision;
use App\Models\EmailServer;
use App\Services\Hosting\Providers\ContaboProvider;
use Illuminate\Support\Facades\File;

class ContaboInfrastructureCloudInitBuilder
{
    public function __construct(
        private ContaboProvider $contaboProvider,
    ) {}

    public function build(ContaboInfrastructureProvision $provision): string
    {
        return match ($provision->purpose) {
            ContaboInfrastructureProvision::PURPOSE_HOSTING_NODE => $this->buildHostingNode($provision),
            ContaboInfrastructureProvision::PURPOSE_EMAIL_PRIMARY => $this->buildMailPrimary($provision),
            ContaboInfrastructureProvision::PURPOSE_EMAIL_EXTENSION => $this->buildMailExtension($provision),
            default => throw new \InvalidArgumentException("Unknown provision purpose: {$provision->purpose}"),
        };
    }

    private function buildHostingNode(ContaboInfrastructureProvision $provision): string
    {
        $helperScript = File::get(base_path('deploy/bin/ladill-hosting-admin'));
        $sudoers = "www-data ALL=(root) NOPASSWD: /usr/local/bin/ladill-hosting-admin *\n";
        $completionUrl = $provision->completionUrl();

        return $this->contaboProvider->generateCloudInit([
            'packages' => ['curl', 'wget', 'git', 'unzip', 'nginx', 'php-fpm', 'mysql-client', 'quota'],
            'ssh_keys' => array_filter([$provision->ssh_public_key]),
            'write_files' => [
                [
                    'path' => '/opt/ladill/ladill-hosting-admin',
                    'permissions' => '0755',
                    'owner' => 'root:root',
                    'content' => $helperScript,
                ],
                [
                    'path' => '/opt/ladill/ladill-hosting.sudoers',
                    'permissions' => '0440',
                    'owner' => 'root:root',
                    'content' => $sudoers,
                ],
            ],
            'run_commands' => [
                'install -Dm755 /opt/ladill/ladill-hosting-admin /usr/local/bin/ladill-hosting-admin',
                'install -Dm440 /opt/ladill/ladill-hosting.sudoers /etc/sudoers.d/ladill-hosting',
                'visudo -cf /etc/sudoers.d/ladill-hosting',
                $this->completionCurlCommand($completionUrl, ['bootstrap' => 'hosting']),
            ],
        ]);
    }

    private function buildMailPrimary(ContaboInfrastructureProvision $provision): string
    {
        $payload = (array) ($provision->payload ?? []);
        $mailHost = (string) ($payload['mail_host'] ?? config('mailinfra.mail_host', 'mail.ladill.com'));
        $dbName = config('infrastructure.mail_stack.db_database', 'mail');
        $dbUser = config('infrastructure.mail_stack.db_username', 'mailuser');
        $dbPassword = (string) ($provision->generated_mail_db_password ?? '');
        $vmailRoot = config('infrastructure.mail_stack.vmail_root', '/var/vmail');
        $vmailUid = (string) config('infrastructure.mail_stack.vmail_uid', 5000);
        $vmailGid = (string) config('infrastructure.mail_stack.vmail_gid', 5000);

        $exportClients = (string) ($payload['export_client_ips'] ?? '');

        $bootstrapScript = str_replace(
            [
                '__MAIL_HOST__', '__DB_PASSWORD__', '__DB_NAME__', '__DB_USER__', '__COMPLETION_URL__',
                '__VMAIL_ROOT__', '__VMAIL_UID__', '__VMAIL_GID__', '__EXPORT_CLIENTS__',
            ],
            [
                $mailHost, $dbPassword, $dbName, $dbUser, $provision->completionUrl(),
                $vmailRoot, $vmailUid, $vmailGid, $exportClients,
            ],
            File::get(resource_path('infrastructure/scripts/mail-primary-bootstrap.sh'))
        );

        $writeFiles = [
            $this->scriptFile('/opt/ladill/nfs-primary-setup.sh', 'infrastructure/scripts/nfs-primary-setup.sh'),
            $this->scriptFile('/opt/ladill/vmail-usage-scan.sh', 'infrastructure/scripts/vmail-usage-scan.sh'),
            [
                'path' => '/opt/ladill/mail-primary-bootstrap.sh',
                'permissions' => '0755',
                'owner' => 'root:root',
                'encoding' => 'b64',
                'content' => base64_encode($bootstrapScript),
            ],
        ];

        return $this->contaboProvider->generateCloudInit([
            'packages' => ['curl', 'wget', 'jq', 'ca-certificates', 'sudo'],
            'ssh_keys' => array_filter([$provision->ssh_public_key]),
            'write_files' => $writeFiles,
            'run_commands' => [
                'bash /opt/ladill/mail-primary-bootstrap.sh',
            ],
        ]);
    }

    private function buildMailExtension(ContaboInfrastructureProvision $provision): string
    {
        $payload = (array) ($provision->payload ?? []);
        $mailHost = (string) ($payload['mail_host'] ?? config('mailinfra.mail_host', 'mail.ladill.com'));
        $primaryIp = (string) ($payload['primary_ip'] ?? '');
        $vmailRoot = config('infrastructure.mail_stack.vmail_root', '/var/vmail');
        $mountOpts = config('infrastructure.mail_stack.nfs_mount_options', 'nfsvers=4.1,rw,hard,timeo=600,retrans=2,_netdev');

        if ($primaryIp === '' && ! empty($payload['primary_email_server_id'])) {
            $primary = EmailServer::find($payload['primary_email_server_id']);
            $primaryIp = $primary?->ip_address ?? '';
            $vmailRoot = $primary?->pool_vmail_root ?: $vmailRoot;
        }

        $bootstrapScript = str_replace(
            [
                '__MAIL_HOST__', '__PRIMARY_IP__', '__COMPLETION_URL__',
                '__VMAIL_ROOT__', '__MOUNT_OPTS__',
            ],
            [
                $mailHost, $primaryIp, $provision->completionUrl(),
                $vmailRoot, $mountOpts,
            ],
            File::get(resource_path('infrastructure/scripts/mail-extension-bootstrap.sh'))
        );

        $writeFiles = [
            $this->scriptFile('/opt/ladill/nfs-extension-setup.sh', 'infrastructure/scripts/nfs-extension-setup.sh'),
            $this->scriptFile('/opt/ladill/vmail-usage-scan.sh', 'infrastructure/scripts/vmail-usage-scan.sh'),
            [
                'path' => '/opt/ladill/mail-extension-bootstrap.sh',
                'permissions' => '0755',
                'owner' => 'root:root',
                'encoding' => 'b64',
                'content' => base64_encode($bootstrapScript),
            ],
        ];

        return $this->contaboProvider->generateCloudInit([
            'packages' => ['curl', 'wget', 'jq', 'ca-certificates', 'sudo'],
            'ssh_keys' => array_filter([$provision->ssh_public_key]),
            'write_files' => $writeFiles,
            'run_commands' => [
                'bash /opt/ladill/mail-extension-bootstrap.sh',
            ],
        ]);
    }

    /**
     * @return array<string, mixed>
     */
    private function scriptFile(string $remotePath, string $localRelativePath): array
    {
        return [
            'path' => $remotePath,
            'permissions' => '0755',
            'owner' => 'root:root',
            'encoding' => 'b64',
            'content' => base64_encode(File::get(resource_path($localRelativePath))),
        ];
    }

    /**
     * @param  array<string, mixed>  $extra
     */
    private function completionCurlCommand(string $url, array $extra = []): string
    {
        $payload = json_encode(array_merge(['status' => 'ok'], $extra), JSON_UNESCAPED_SLASHES);

        return "curl -fsS -X POST ".escapeshellarg($url)." -H 'Content-Type: application/json' -d ".escapeshellarg($payload)." || true";
    }
}