<?php

namespace App\Http\Controllers\admin;

use App\Http\Controllers\Controller;
use App\Mail\VmSuspendedMail;
use App\Models\ModuleVmware;
use App\Models\VirtualMachines;
use App\Services\VmMetricsService;
use Illuminate\Http\Request;
use App\Support\TlsHttpClientFactory;
use Illuminate\Support\Facades\Mail;
use RuntimeException;

class VCenterManagerController extends Controller
{
    public function __construct(private readonly VmMetricsService $vmMetrics)
    {
    }

    public function powerState(Request $request)
    {
        $vmId = (int) $request->input('vm_id');

        $vm = VirtualMachines::find($vmId);

        if (!$vm) {
            return response()->json(['error' => true, 'message' => 'VM not found'], 404);
        }

        return response()->json(['error' => false, 'data' => ['power_state' => $vm->power_state]]);
    }

    public function powerOn(Request $request)
    {
        $vmId = (int) $request->input('vm_id');

        $vm = VirtualMachines::find($vmId);

        if (!$vm) {
            return response()->json(['error' => true, 'message' => 'VM not found'], 404);
        }

        $vmwareId = $vm->vm_id;

        if (!$vmwareId) {
            return response()->json(['error' => true, 'message' => 'VM VMware ID not found'], 400);
        }

        if ($vm->power_state === 'POWERED_ON') {
            return response()->json(['error' => true, 'message' => 'VM is already powered on'], 400);
        }

        $vcenter = null;

        if ($vm->datacenter?->vCenter) {
            $vcenter = $vm->datacenter->vCenter;
        }

        if (!$vcenter && $vm->host?->datacenter?->vCenter) {
            $vcenter = $vm->host->datacenter->vCenter;
        }

        if (!$vcenter) {
            return response()->json(['error' => true, 'message' => 'vCenter not found'], 400);
        }

        $vCenterService = new \App\Http\Services\vCenter();

        if (!$vCenterService->loginServer($vcenter)) {
            return response()->json(['error' => true, 'message' => 'Cannot login to vCenter'], 400);
        }

        $response = TlsHttpClientFactory::vCenter()
            ->withHeaders([
                'vmware-api-session-id' => $vCenterService->token
            ])
            ->post("https://{$vCenterService->apiUri}/rest/vcenter/vm/$vmwareId/power/start");

        if ($response->status() === 200) {
            $vm->update(['power_state' => 'POWERED_ON']);
            return response()->json(['error' => false, 'message' => 'Power on command sent successfully']);
        }

        $errorData = $response->json();
        if (isset($errorData['error_type']) && $errorData['error_type'] === 'ALREADY_IN_DESIRED_STATE') {
            $vm->update(['power_state' => 'POWERED_ON']);
            return response()->json(['error' => false, 'message' => 'VM is already powered on']);
        }

        return response()->json(['error' => true, 'message' => $errorData['value'] ?? $errorData['error_type'] ?? 'Failed to power on VM'], 400);
    }

    public function powerOff(Request $request)
    {
        $vmId = (int) $request->input('vm_id');

        $vm = VirtualMachines::find($vmId);

        if (!$vm) {
            return response()->json(['error' => true, 'message' => 'VM not found'], 404);
        }

        $vmwareId = $vm->vm_id;

        if (!$vmwareId) {
            return response()->json(['error' => true, 'message' => 'VM VMware ID not found'], 400);
        }

        if ($vm->power_state === 'POWERED_OFF') {
            return response()->json(['error' => true, 'message' => 'VM is already powered off'], 400);
        }

        $vcenter = null;

        if ($vm->datacenter?->vCenter) {
            $vcenter = $vm->datacenter->vCenter;
        }

        if (!$vcenter && $vm->host?->datacenter?->vCenter) {
            $vcenter = $vm->host->datacenter->vCenter;
        }

        if (!$vcenter) {
            return response()->json(['error' => true, 'message' => 'vCenter not found'], 400);
        }

        $vCenterService = new \App\Http\Services\vCenter();

        if (!$vCenterService->loginServer($vcenter)) {
            return response()->json(['error' => true, 'message' => 'Cannot login to vCenter'], 400);
        }

        $response = TlsHttpClientFactory::vCenter()
            ->withHeaders([
                'vmware-api-session-id' => $vCenterService->token
            ])
            ->post("https://{$vCenterService->apiUri}/rest/vcenter/vm/$vmwareId/power/stop");

        if ($response->status() === 200) {
            $vm->update(['power_state' => 'POWERED_OFF']);
            return response()->json(['error' => false, 'message' => 'Power off command sent successfully']);
        }

        $errorData = $response->json();
        if (isset($errorData['error_type']) && $errorData['error_type'] === 'ALREADY_IN_DESIRED_STATE') {
            $vm->update(['power_state' => 'POWERED_OFF']);
            return response()->json(['error' => false, 'message' => 'VM is already powered off']);
        }

        return response()->json(['error' => true, 'message' => $errorData['value'] ?? $errorData['error_type'] ?? 'Failed to power off VM'], 400);
    }

    public function restart(Request $request)
    {
        $vmId = (int) $request->input('vm_id');

        $vm = VirtualMachines::find($vmId);

        if (!$vm) {
            return response()->json(['error' => true, 'message' => 'VM not found'], 404);
        }

        $vmwareId = $vm->vm_id;

        if (!$vmwareId) {
            return response()->json(['error' => true, 'message' => 'VM VMware ID not found'], 400);
        }

        $vcenter = $vm->datacenter?->vCenter ?? $vm->host?->datacenter?->vCenter;

        if (!$vcenter) {
            return response()->json(['error' => true, 'message' => 'vCenter not found'], 400);
        }

        $vCenterService = new \App\Http\Services\vCenter();

        if (!$vCenterService->loginServer($vcenter)) {
            return response()->json(['error' => true, 'message' => 'Cannot login to vCenter'], 400);
        }

        $response = TlsHttpClientFactory::vCenter()
            ->withHeaders(['vmware-api-session-id' => $vCenterService->token])
            ->post("https://{$vCenterService->apiUri}/rest/vcenter/vm/$vmwareId/power/reset");

        if ($response->status() === 200) {
            return response()->json(['error' => false, 'message' => 'Restart command sent successfully']);
        }

        $errorData = $response->json();
        return response()->json([
            'error' => true,
            'message' => $errorData['value'] ?? $errorData['error_type'] ?? 'Failed to restart VM',
        ], 400);
    }

    public function snapshot(Request $request)
    {
        $request->validate([
            'vm_id'       => 'required|integer',
            'name'        => 'required|string|max:255',
            'description' => 'nullable|string|max:1000',
        ]);

        $vmId = (int) $request->input('vm_id');

        $vm = VirtualMachines::find($vmId);

        if (!$vm) {
            return response()->json(['error' => true, 'message' => 'VM not found'], 404);
        }

        $vmwareId = $vm->vm_id;

        if (!$vmwareId) {
            return response()->json(['error' => true, 'message' => 'VM VMware ID not found'], 400);
        }

        $vcenter = $vm->datacenter?->vCenter ?? $vm->host?->datacenter?->vCenter;

        if (!$vcenter) {
            return response()->json(['error' => true, 'message' => 'vCenter not found'], 400);
        }

        $vCenterService = new \App\Http\Services\vCenter();

        if (!$vCenterService->loginServer($vcenter)) {
            return response()->json(['error' => true, 'message' => 'Cannot login to vCenter'], 400);
        }

        $response = TlsHttpClientFactory::vCenter()
            ->withHeaders(['vmware-api-session-id' => $vCenterService->token])
            ->post("https://{$vCenterService->apiUri}/rest/vcenter/vm/$vmwareId/snapshot", [
                'spec' => [
                    'name'        => $request->input('name'),
                    'description' => $request->input('description', ''),
                    'memory'      => false,
                    'quiesce'     => false,
                ],
            ]);

        if ($response->status() === 200) {
            return response()->json(['error' => false, 'message' => 'Snapshot created successfully']);
        }

        $errorData = $response->json();
        return response()->json([
            'error' => true,
            'message' => $errorData['value'] ?? $errorData['error_type'] ?? 'Failed to create snapshot',
        ], 400);
    }

    public function stats(Request $request)
    {
        $vmId = (int) $request->input('vm_id');

        $vm = VirtualMachines::find($vmId);

        if (!$vm) {
            return response()->json(['error' => true, 'message' => 'VM not found'], 404);
        }

        $vmwareId = $vm->vm_id;

        if (!$vmwareId) {
            return response()->json(['error' => true, 'message' => 'VM VMware ID not found'], 400);
        }

        if ($vm->power_state !== 'POWERED_ON') {
            return response()->json(['error' => true, 'message' => 'VM is not powered on'], 400);
        }

        try {
            $stats = $this->vmMetrics->get($vmwareId, $vm->ram_mb, $vm->cpu);
        } catch (RuntimeException $exception) {
            $status = $exception->getCode() === 404 ? 404 : 502;

            return response()->json([
                'error' => true,
                'message' => $status === 404
                    ? 'VM metrics are unavailable'
                    : 'Unable to fetch VM metrics',
            ], $status);
        }

        return response()->json([
            'error' => false,
            'data' => $stats,
        ]);
    }

    public function getPoweredOffVms()
    {
        $vms = VirtualMachines::whereNotNull('vm_id')
            ->where('power_state', 'POWERED_OFF')
            ->get()
            ->map(function ($vm) {
                return [
                    'id' => $vm->id,
                    'name' => $vm->name,
                    'vm_id' => $vm->vm_id,
                    'power_state' => $vm->power_state,
                ];
            });

        return response()->json([
            'error' => false,
            'data' => $vms
        ]);
    }

    public function suspend(Request $request)
    {
        $vmId = (int) $request->input('vm_id');

        // vm_id from frontend = services.vm_id = module_vmware.id (FK)
        $vmware = ModuleVmware::with('vCenter')->find($vmId);

        if (!$vmware) {
            return response()->json(['error' => true, 'message' => 'VM not found'], 404);
        }

        $vmwareId = $vmware->vmware_id;

        if (!$vmwareId) {
            return response()->json(['error' => true, 'message' => 'VM VMware ID not found'], 400);
        }

        $vm = VirtualMachines::where('vm_id', $vmwareId)->first();

        if ($vm?->power_state === 'SUSPENDED') {
            return response()->json(['error' => true, 'message' => 'VM is already suspended'], 400);
        }

        $vcenter = $vmware->vCenter;

        if (!$vcenter) {
            return response()->json(['error' => true, 'message' => 'vCenter not found'], 400);
        }

        $vCenterService = new \App\Http\Services\vCenter();

        if (!$vCenterService->loginServer($vcenter)) {
            return response()->json(['error' => true, 'message' => 'Cannot login to vCenter'], 400);
        }

        $response = TlsHttpClientFactory::vCenter()
            ->withHeaders(['vmware-api-session-id' => $vCenterService->token])
            ->post("https://{$vCenterService->apiUri}/rest/vcenter/vm/$vmwareId/power/suspend");

        if ($response->status() === 200) {
            $vm?->update(['power_state' => 'SUSPENDED']);
            $this->sendSuspendNotification($vmware, $vm);
            return response()->json(['error' => false, 'message' => 'Suspend command sent successfully']);
        }

        $errorData = $response->json();
        if (isset($errorData['error_type']) && $errorData['error_type'] === 'ALREADY_IN_DESIRED_STATE') {
            $vm?->update(['power_state' => 'SUSPENDED']);
            $this->sendSuspendNotification($vmware, $vm);
            return response()->json(['error' => false, 'message' => 'VM is already suspended']);
        }

        return response()->json([
            'error' => true,
            'message' => $errorData['value'] ?? $errorData['error_type'] ?? 'Failed to suspend VM',
        ], 400);
    }

    public function updateConfig(Request $request)
    {
        $request->validate([
            'vm_name' => 'required|string',
            'cpu'     => 'required|integer|min:1',
            'ram'     => 'required|integer|min:1',
        ]);

        $vmware = ModuleVmware::where('name', $request->input('vm_name'))->first();

        if (!$vmware) {
            return response()->json(['error' => true, 'message' => 'VM not found'], 404);
        }

        \App\Jobs\VirtualMachine\Provision\UpdateVmConfigJob::dispatch(
            $vmware->id,
            (string) $vmware->vmware_id,
            '',
            (int) $request->input('cpu'),
            (int) $request->input('ram'),
        );

        return response()->json(['error' => false, 'message' => 'Đã gửi yêu cầu cập nhật cấu hình VM']);
    }

    public function deleteVM(Request $request)
    {
        $request->validate([
            'vm_id'        => 'required|integer',
            'confirm_name' => 'required|string',
        ]);

        $vmId = (int) $request->input('vm_id');
        $vm   = VirtualMachines::find($vmId);

        if (!$vm) {
            return response()->json(['error' => true, 'message' => 'VM not found'], 404);
        }

        if ($request->input('confirm_name') !== $vm->name) {
            return response()->json(['error' => true, 'message' => "Tên xác nhận không khớp. Vui lòng nhập đúng: {$vm->name}"], 422);
        }

        if ($vm->power_state !== 'POWERED_OFF') {
            return response()->json(['error' => true, 'message' => 'Vui lòng tắt máy ảo trước khi xoá'], 400);
        }

        $vcenter = $vm->datacenter?->vCenter ?? $vm->host?->datacenter?->vCenter;

        if (!$vcenter) {
            return response()->json(['error' => true, 'message' => 'vCenter not found'], 400);
        }

        $powerShellService = app(\App\Http\Services\vCenter\PowerShellService::class);

        $q        = fn(string $v) => str_replace("'", "''", $v);
        $vmName   = $vm->name;
        $host     = $vcenter->host;
        $user     = $vcenter->user;
        $password = \App\Http\Facade\SignRSA::DecryptFunc($vcenter->password);

        $command   = "& 'C:\\CLISave\\DeleteVM\\deleteVM.ps1' -VmName '" . $q($vmName) . "' -VCenterHost '" . $q($host) . "' -VCenterUser '" . $q($user) . "' -VCenterPassword '" . $q($password) . "'";
        $cmdResult = $powerShellService->runPsCommand($command);

        if (strpos($cmdResult, 'Login_Fail') !== false) {
            return response()->json(['error' => true, 'message' => 'SSH Login to PowerShell server failed'], 400);
        }

        if (strpos($cmdResult, 'SUCCESS') === false) {
            return response()->json(['error' => true, 'message' => 'Xoá VM thất bại: ' . $cmdResult], 400);
        }

        $vm->delete();

        return response()->json(['error' => false, 'message' => 'VM đã được xoá thành công']);
    }

    private function sendSuspendNotification(ModuleVmware $vmware, ?VirtualMachines $vm = null): void
    {
        $vmware->loadMissing('customer');

        if (!$vmware->customer || !$vmware->customer->email) {
            return;
        }

        try {
            Mail::to($vmware->customer->email)
                ->queue(new VmSuspendedMail($vmware->customer, $vm?->name ?? $vmware->name, $vmware->vmware_id));
        } catch (\Throwable) {
            // Email failure must not block the suspend response
        }
    }
}