<?php

namespace App\Jobs;

use App\Exceptions\ContaboApiException;
use App\Models\CustomerHostingOrder;
use App\Models\HostedSite;
use App\Models\HostingAccount;
use App\Models\HostingNode;
use App\Models\ProvisioningQueueItem;
use App\Services\Hosting\HostingResourcePolicyService;
use App\Services\Hosting\NodeCapacityService;
use App\Services\Hosting\Providers\ContaboProvider;
use App\Services\Hosting\ServerOrderService;
use App\Services\Hosting\ServerAgentBootstrapService;
use App\Services\Hosting\ServerAgentInstallerService;
use App\Services\Hosting\Providers\SharedNodeProvider;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Str;

class ProvisionHostingOrderJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    public int $tries = 3;
    public int $backoff = 300;

    public function __construct(
        public CustomerHostingOrder $order
    ) {}

    public function handle(
        NodeCapacityService $capacityService,
        HostingResourcePolicyService $resourcePolicyService,
        SharedNodeProvider $sharedProvider,
        ContaboProvider $contaboProvider,
        ServerOrderService $serverOrders,
        ServerAgentBootstrapService $serverAgentBootstrap,
        ServerAgentInstallerService $serverAgentInstaller,
    ): void {
        if ($this->order->status !== CustomerHostingOrder::STATUS_APPROVED) {
            return;
        }

        $this->order->markAsProvisioning();

        $product = $this->order->product;
        $queueItem = $this->getOrCreateQueueItem();

        try {
            $queueItem->markAsProcessing();

            if ($product->isSharedHosting()) {
                $this->provisionSharedHosting($capacityService, $resourcePolicyService, $sharedProvider, $queueItem);
            } elseif ($product->isVps()) {
                $this->provisionVps($contaboProvider, $serverOrders, $serverAgentBootstrap, $serverAgentInstaller, $queueItem);
            } elseif ($product->isDedicated()) {
                $this->provisionDedicated($contaboProvider, $serverOrders, $serverAgentBootstrap, $serverAgentInstaller, $queueItem);
            } else {
                throw new \Exception("Unknown product category: {$product->category}");
            }

            $queueItem->markAsCompleted();

        } catch (\Throwable $e) {
            if ($this->shouldHoldForAdmin($e)) {
                $message = $e->getMessage();
                $queueItem->markAsFailed($message);
                $this->order->fresh()->holdForAdminProvisioning(
                    $message,
                    $e instanceof ContaboApiException ? $e->httpStatus : null,
                );

                return;
            }

            $queueItem->markAsFailed($e->getMessage());

            if ($queueItem->canRetry()) {
                $this->release($this->backoff);
            } else {
                $this->order->markAsFailed($e->getMessage());
            }

            throw $e;
        }
    }

    private function shouldHoldForAdmin(\Throwable $e): bool
    {
        if ($e instanceof ContaboApiException) {
            return $e->isPaymentRequired();
        }

        $product = $this->order->product;
        if ($product?->requiresContabo() !== true) {
            return false;
        }

        return ContaboApiException::messageIndicatesPaymentRequired($e->getMessage());
    }

    private function provisionSharedHosting(
        NodeCapacityService $capacityService,
        HostingResourcePolicyService $resourcePolicyService,
        SharedNodeProvider $sharedProvider,
        ProvisioningQueueItem $queueItem
    ): void {
        $queueItem->addLog('Finding available shared hosting node...');

        $product = $this->order->product;
        $requestedDiskGb = (int) ($product->disk_gb ?? 0);
        $segment = $product->preferredNodeSegment();
        $node = $capacityService->findAvailableNodeForProduct($product);

        if (!$node) {
            throw new \Exception('No available shared hosting nodes. Please provision a new node.');
        }

        $queueItem->addLog("Selected node: {$node->name} ({$node->ip_address}) [segment={$segment}, requested_disk={$requestedDiskGb}GB]");

        // Generate username
        $username = $this->generateUsername($this->order->domain_name);
        $password = Str::password(16, true, true, false, false);

        $queueItem->addLog("Creating account: {$username}");
        $resourceLimits = $resourcePolicyService->defaultLimitsForProduct($product);

        // Create account on node via SSH
        $result = $sharedProvider->createAccountOnNode($node, [
            'username' => $username,
            'password' => $password,
            'domain' => $this->order->domain_name,
            'email' => $this->order->user->email ?: $this->order->guest_email,
            'disk_quota_mb' => max($requestedDiskGb, 1) * 1024,
            'bandwidth_mb' => (($product->bandwidth_gb ?? 100) > 0 ? $product->bandwidth_gb : 100) * 1024,
        ]);

        // Create hosting account record
        $primaryDomain = \App\Services\Hosting\PlaceholderPrimaryDomainService::isPlaceholderDomain($this->order->domain_name)
            ? null
            : $this->order->domain_name;

        $account = HostingAccount::create([
            'user_id' => $this->order->user_id,
            'hosting_node_id' => $node->id,
            'hosting_product_id' => $product->id,
            'username' => $username,
            'primary_domain' => $primaryDomain,
            'type' => HostingAccount::TYPE_SHARED,
            'status' => HostingAccount::STATUS_ACTIVE,
            'home_directory' => $result['home_directory'] ?? "/home/{$username}",
            'allocated_disk_gb' => $requestedDiskGb,
            'disk_used_bytes' => 0,
            'bandwidth_used_bytes' => 0,
            'cpu_limit_percent' => $resourceLimits['cpu_limit_percent'],
            'memory_limit_mb' => $resourceLimits['memory_limit_mb'],
            'process_limit' => $resourceLimits['process_limit'],
            'io_limit_mb' => $resourceLimits['io_limit_mb'],
            'inode_limit' => $resourceLimits['inode_limit'],
            'resource_status' => HostingAccount::RESOURCE_STATUS_ACTIVE,
            'uploads_restricted' => false,
            'is_flagged' => false,
            'warning_count' => 0,
            'suspended_at' => null,
            'provisioned_at' => now(),
            'expires_at' => $this->order->calculateExpiryDate(),
            'metadata' => [
                'assigned_duration_months' => $this->order->getCycleLengthInMonths(),
                'initial_password' => $password,
                'provisioned_from_order_id' => $this->order->id,
                'provisioned_on_node' => $node->name,
            ],
            'resource_limits' => array_merge([
                'disk_gb' => $requestedDiskGb,
                'bandwidth_gb' => $product->bandwidth_gb,
                'max_domains' => $product->max_domains,
                'max_databases' => $product->max_databases,
            ], $resourceLimits),
        ]);

        if ($primaryDomain) {
            HostedSite::create([
                'hosting_account_id' => $account->id,
                'domain_id' => $this->order->domain_id,
                'domain' => $primaryDomain,
                'document_root' => ($result['document_root'] ?? "/home/{$username}/public_html"),
                'type' => 'primary',
                'status' => 'active',
                'php_version' => '8.4',
                'ssl_enabled' => false,
            ]);
        }

        $sharedProvider->applyAccountResourceProfile($account, false);

        $node = $capacityService->refreshNodeResourceTotals($node);
        $capacityService->checkNode($node);

        // Install WordPress if it's a WordPress hosting plan
        $wpCredentials = [];
        if ($product->type === 'wordpress') {
            $queueItem->addLog('Installing WordPress...');
            $docRoot = $result['document_root'] ?? "/home/{$username}/public_html";
            $wpCredentials = $sharedProvider->installWordPress($node, $username, $this->order->domain_name, [
                'document_root' => $docRoot,
                'admin_email' => $this->order->user->email ?: $this->order->guest_email,
                'site_title' => $this->order->domain_name,
            ]);
        }

        $queueItem->addLog('Provisioning completed successfully.');

        // Update order with provisioning details
        $orderMeta = array_merge($this->order->meta ?? [], [
            'provisioned_on_node' => $node->name,
            'node_segment' => $node->segment,
            'requested_disk_gb' => $requestedDiskGb,
            'initial_password' => $password,
        ]);

        // Add WordPress credentials if installed
        if (!empty($wpCredentials)) {
            $orderMeta['wp_admin_user'] = $wpCredentials['admin_user'] ?? 'admin';
            $orderMeta['wp_admin_password'] = $wpCredentials['admin_password'] ?? null;
            $orderMeta['wp_admin_email'] = $wpCredentials['admin_email'] ?? null;
            $orderMeta['wp_db_name'] = $wpCredentials['db_name'] ?? null;
            $orderMeta['wp_db_user'] = $wpCredentials['db_user'] ?? null;
            $orderMeta['wp_db_password'] = $wpCredentials['db_password'] ?? null;
        }

        $this->order->markAsActive([
            'hosting_node_id' => $node->id,
            'hosting_account_id' => $account->id,
            'server_username' => $username,
            'server_ip' => $node->ip_address,
            'control_panel_url' => "https://{$this->order->domain_name}/cpanel",
            'expires_at' => $this->order->calculateExpiryDate(),
            'meta' => $orderMeta,
        ]);
    }

    private function provisionVps(ContaboProvider $contaboProvider, ServerOrderService $serverOrders, ServerAgentBootstrapService $serverAgentBootstrap, ServerAgentInstallerService $serverAgentInstaller, ProvisioningQueueItem $queueItem): void
    {
        $queueItem->addLog('Provisioning VPS via Contabo API...');

        $product = $this->order->product;

        if (!$product->contabo_product_id) {
            throw new \Exception('Product does not have a Contabo product ID configured.');
        }

        $provisioning = $this->serverProvisioningConfig($serverOrders, 'VPS');
        if ((bool) ($provisioning['panel_snapshot']['managed_stack_candidate'] ?? false)) {
            $bootstrap = $serverAgentBootstrap->ensureBootstrap($this->order->fresh());
            $provisioning = $serverAgentInstaller->augmentProvisioningConfig($this->order->fresh(), $provisioning, $bootstrap);
            $queueItem->addLog('Managed stack bootstrap and Ladill server agent install prepared.');
        }
        $result = $contaboProvider->createInstance($provisioning);

        $queueItem->addLog("VPS created with instance ID: {$result['instance_id']}");
        foreach ($provisioning['manual_follow_up'] ?? [] as $item) {
            $queueItem->addLog("Manual follow-up required for {$item}.");
        }

        $this->order->markAsActive([
            'server_ip' => $result['ip_address'] ?? null,
            'server_username' => (string) ($provisioning['default_user'] ?? 'root'),
            'control_panel_url' => $this->serverControlPanelUrl($provisioning),
            'expires_at' => $this->order->calculateExpiryDate(),
            'meta' => array_merge($this->order->meta ?? [], [
                'contabo_instance_id' => $result['instance_id'],
                'server_panel_runtime' => $provisioning['panel_snapshot'] ?? data_get($this->order->meta, 'server_panel_runtime', []),
                'server_panel' => [
                    'panel' => $provisioning['panel'] ?? null,
                    'instance_status' => $result['status'] ?? null,
                    'power_status' => 'on',
                    'region' => $result['region'] ?? null,
                    'datacenter' => $result['datacenter'] ?? null,
                    'image' => $result['image'] ?? null,
                    'last_synced_at' => now()->toIso8601String(),
                ],
            ]),
        ]);

        if ((bool) ($provisioning['panel_snapshot']['managed_stack_candidate'] ?? false)) {
            $serverAgentBootstrap->ensureBootstrap($this->order->fresh());
        }
    }

    private function provisionDedicated(ContaboProvider $contaboProvider, ServerOrderService $serverOrders, ServerAgentBootstrapService $serverAgentBootstrap, ServerAgentInstallerService $serverAgentInstaller, ProvisioningQueueItem $queueItem): void
    {
        $queueItem->addLog('Provisioning Dedicated Server via Contabo API...');

        $product = $this->order->product;

        if (!$product->contabo_product_id) {
            throw new \Exception('Product does not have a Contabo product ID configured.');
        }

        $provisioning = $this->serverProvisioningConfig($serverOrders, 'Dedicated');
        if ((bool) ($provisioning['panel_snapshot']['managed_stack_candidate'] ?? false)) {
            $bootstrap = $serverAgentBootstrap->ensureBootstrap($this->order->fresh());
            $provisioning = $serverAgentInstaller->augmentProvisioningConfig($this->order->fresh(), $provisioning, $bootstrap);
            $queueItem->addLog('Managed stack bootstrap and Ladill server agent install prepared.');
        }
        $result = $contaboProvider->createInstance($provisioning);

        $queueItem->addLog("Dedicated server created with instance ID: {$result['instance_id']}");
        foreach ($provisioning['manual_follow_up'] ?? [] as $item) {
            $queueItem->addLog("Manual follow-up required for {$item}.");
        }

        $this->order->markAsActive([
            'server_ip' => $result['ip_address'] ?? null,
            'server_username' => (string) ($provisioning['default_user'] ?? 'root'),
            'control_panel_url' => $this->serverControlPanelUrl($provisioning),
            'expires_at' => $this->order->calculateExpiryDate(),
            'meta' => array_merge($this->order->meta ?? [], [
                'contabo_instance_id' => $result['instance_id'],
                'server_panel_runtime' => $provisioning['panel_snapshot'] ?? data_get($this->order->meta, 'server_panel_runtime', []),
                'server_panel' => [
                    'panel' => $provisioning['panel'] ?? null,
                    'instance_status' => $result['status'] ?? null,
                    'power_status' => 'on',
                    'region' => $result['region'] ?? null,
                    'datacenter' => $result['datacenter'] ?? null,
                    'image' => $result['image'] ?? null,
                    'last_synced_at' => now()->toIso8601String(),
                ],
            ]),
        ]);

        if ((bool) ($provisioning['panel_snapshot']['managed_stack_candidate'] ?? false)) {
            $serverAgentBootstrap->ensureBootstrap($this->order->fresh());
        }
    }

    /**
     * @return array<string, mixed>
     */
    private function serverProvisioningConfig(ServerOrderService $serverOrders, string $prefix): array
    {
        $meta = (array) ($this->order->meta ?? []);
        $serverOrder = (array) ($meta['server_order'] ?? []);
        $selection = (array) ($serverOrder['selection'] ?? []);
        $passwordEncrypted = $serverOrder['server_password_encrypted'] ?? null;

        $config = $serverOrders->provisioningConfig(
            $this->order->product,
            $selection,
            "{$prefix}-{$this->order->id}-{$this->order->domain_name}",
            $this->order->billing_cycle
        );

        if (is_string($passwordEncrypted) && $passwordEncrypted !== '') {
            $config['root_password'] = decrypt($passwordEncrypted);
        }

        return $config;
    }

    /**
     * @param  array<string, mixed>  $provisioning
     */
    private function serverControlPanelUrl(array $provisioning): ?string
    {
        if (($provisioning['panel'] ?? null) !== 'ladill') {
            return null;
        }

        return route('hosting.server-panel.show', $this->order);
    }

    private function getOrCreateQueueItem(): ProvisioningQueueItem
    {
        $existing = ProvisioningQueueItem::where('customer_hosting_order_id', $this->order->id)->first();

        if ($existing) {
            return $existing;
        }

        $provider = match ($this->order->product->category) {
            'shared' => ProvisioningQueueItem::PROVIDER_SHARED_NODE,
            'vps' => ProvisioningQueueItem::PROVIDER_CONTABO_VPS,
            'dedicated' => ProvisioningQueueItem::PROVIDER_CONTABO_DEDICATED,
            default => ProvisioningQueueItem::PROVIDER_SHARED_NODE,
        };

        return ProvisioningQueueItem::create([
            'customer_hosting_order_id' => $this->order->id,
            'status' => ProvisioningQueueItem::STATUS_QUEUED,
            'provider' => $provider,
        ]);
    }

    private function generateUsername(string $domain): string
    {
        // Remove TLD and special characters
        $base = preg_replace('/[^a-z0-9]/', '', strtolower(explode('.', $domain)[0]));
        $base = substr($base, 0, 8);

        // Add random suffix to ensure uniqueness
        return $base . Str::random(4);
    }
}