<?php

namespace App\Livewire\Services;

use App\Helpers\ExtensionHelper;
use App\Livewire\Component;
use App\Models\Service;
use Paymenter\Extensions\Servers\Proxmox\Models\Server as ProxmoxServer;
use Paymenter\Extensions\Servers\Proxmox\Proxmox;
use Livewire\Attributes\Locked;
use Livewire\Attributes\Url;

class Show extends Component
{
    public Service $service;

    public ?ProxmoxServer $proxmoxServer = null;

    /**
     * Actual VM status from Proxmox API (includes maxmem, maxdisk, cpus, etc.)
     */
    public ?array $vmStatus = null;

    #[Locked]
    public $buttons = [];

    #[Locked]
    public $views = [];

    #[Url('tab', except: false), Locked]
    public $currentView;

    #[Url('cancel', except: false)]
    public bool $showCancel = false;

    public function mount()
    {
        // Attach Proxmox server (if any) so we can show hostname on the service page
        $this->proxmoxServer = ProxmoxServer::with(['os', 'node', 'ipAddresses'])->where('service_id', $this->service->id)->first();

        // Fetch actual VM status from Proxmox API if server exists
        if ($this->proxmoxServer) {
            $this->loadVmStatus();
        }

        // Only fetch the actions if the service is active
        if ($this->service->status == Service::STATUS_ACTIVE) {
            $actions = [];
            try {
                $actions = ExtensionHelper::getActions($this->service);
            } catch (\Exception $e) {
            }
            // separate the actions into buttons and views
            foreach ($actions as $action) {
                if ($action['type'] == 'button') {
                    $this->buttons[] = $action;
                } elseif ($action['type'] == 'view') {
                    $this->views[] = $action;
                }
            }
            $this->currentView = $this->currentView ?? ($this->views[0]['name'] ?? null);
        }
    }

    public function changeView($view)
    {
        if (!$view) {
            return;
        }
        if ($this->currentView === $view || !in_array($view, array_column($this->views, 'name'))) {
            return $this->skipRender();
        }
        $this->currentView = $view;
    }

    public function updatedShowCancel($value)
    {
        if (!$this->service->cancellable) {
            $this->notify('This service cannot be cancelled', 'error');
            $this->showCancel = false;

            return;
        }
    }

    public function goto($function)
    {
        // Check if function is allowed
        if (!in_array($function, array_column($this->buttons, 'function'))) {
            $this->notify('This action is not allowed', 'error');

            return;
        }
        $result = ExtensionHelper::callService($this->service, $function);
        // If its a response, return it
        if (!is_string($result)) {
            return $result;
        }
        $this->redirect($result);
    }

    /**
     * Load the actual VM status from Proxmox API.
     */
    protected function loadVmStatus(): void
    {
        try {
            if (!$this->proxmoxServer || !$this->proxmoxServer->node) {
                return;
            }
            
            $proxmox = new Proxmox();
            $data = $proxmox->request(
                '/nodes/' . $this->proxmoxServer->node->name . '/qemu/' . $this->proxmoxServer->vm_id . '/status/current'
            )->json()['data'] ?? null;

            $this->vmStatus = $data;
            
            // Also fetch VM config to calculate accurate total storage
            // The status endpoint's maxdisk is often unreliable
            if ($this->vmStatus) {
                $config = $proxmox->request(
                    '/nodes/' . $this->proxmoxServer->node->name . '/qemu/' . $this->proxmoxServer->vm_id . '/config'
                )->json()['data'] ?? null;
                
                if ($config) {
                    $totalDiskGB = $this->calculateTotalStorage($config);
                    if ($totalDiskGB > 0) {
                        // Store as bytes for consistency with other values
                        $this->vmStatus['total_disk_bytes'] = $totalDiskGB * 1024 * 1024 * 1024;
                    }
                }
            }
        } catch (\Throwable $e) {
            $this->vmStatus = null;
        }
    }

    /**
     * Calculate total storage from VM config (excluding cloud-init, EFI, TPM).
     * Returns size in GB.
     */
    protected function calculateTotalStorage(array $config): float
    {
        $totalSize = 0;

        foreach ($config as $key => $value) {
            // Check for attached drives (ide, sata, scsi, virtio)
            if (preg_match('/^(ide|sata|scsi|virtio)(\d+)$/', $key)) {
                // Skip excluded disks (cloud-init, EFI, TPM)
                if ($this->isExcludedDisk($value)) {
                    continue;
                }
                // Skip CD-ROM drives
                if (str_contains($value, 'media=cdrom')) {
                    continue;
                }
                $totalSize += $this->extractDiskSize($value);
            }
        }

        return $totalSize;
    }

    /**
     * Check if a disk should be excluded (cloud-init, EFI, TPM).
     */
    protected function isExcludedDisk(string $value): bool
    {
        $excludePatterns = ['cloudinit', 'vm-\d+-cloudinit', 'efidisk', 'tpmstate'];
        foreach ($excludePatterns as $pattern) {
            if (preg_match('/' . $pattern . '/i', $value)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Extract disk size in GB from a disk configuration string.
     */
    protected function extractDiskSize(string $value): float
    {
        // Example: cephpool:vm-100-disk-0,size=32G,cache=none,ssd=1
        $parts = explode(',', $value);
        
        foreach ($parts as $part) {
            if (preg_match('/^size=(\d+)([KMGT]?)$/i', $part, $sizeMatch)) {
                $size = (float) $sizeMatch[1];
                $unit = strtoupper($sizeMatch[2] ?? 'G');
                
                switch ($unit) {
                    case 'K': return $size / (1024 * 1024);
                    case 'M': return $size / 1024;
                    case 'G':
                    case '': return $size;
                    case 'T': return $size * 1024;
                }
            }
        }
        
        return 0;
    }

    public function render()
    {
        $view = null;
        $previousView = $this->currentView;

        if ($this->currentView) {
            try {
                // Search array for the current view
                $currentViewObj = $this->views[array_search($this->currentView, array_column($this->views, 'name'))] ?? null;
                if (!$currentViewObj) {
                    throw new \Exception('View not found');
                }
                $view = ExtensionHelper::getView($this->service, $currentViewObj);
            } catch (\Exception $e) {
                if ($previousView !== $this->views[0]['name'] ?? null) {
                    $this->notify('Got an error while trying to load the view', 'error');
                }
                $this->currentView = $this->views[0]['name'] ?? null;
            }
        }

        return view('services.show', ['extensionView' => $view])->layoutData([
            'title' => 'Services',
            'sidebar' => true,
        ]);
    }
}