<?php

namespace App\Http\Services\vCenter;

use App\Support\Cache\CacheKey;
use App\Support\PowerShellEscaper;
use App\Support\TlsHttpClientFactory;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Log;

class SnapshotService
{
    protected Client $client;
    protected PowerShellService $powerShellService;

    public function __construct(Client $client, PowerShellService $powerShellService)
    {
        $this->client = $client;
        $this->powerShellService = $powerShellService;
    }

    /**
     * Resolve vCenter từ product (ModuleVmware) qua nhiều cách:
     * 1. Direct relation qua vcenter_id
     * 2. Qua ipAddress → host → datacenter → vCenter
     * 3. Qua Service relation
     */
    protected function resolveVCenterFromProduct($product): ?\App\Models\vCenter
    {
        // Cách 1: Ưu tiên quan hệ trực tiếp trên ModuleVmware
        if ($product->vCenter) {
            return $product->vCenter;
        }

        // Cách 2: Fallback qua ipAddress chain
        if ($product->ipaddress?->host?->datacenter?->vCenter) {
            return $product->ipaddress->host->datacenter->vCenter;
        }

        // Cách 3: Qua Service relation
        $service = $product->services()->first();
        if ($service) {
            $service->load('vmware.vCenter');
            if ($service->vmware?->vCenter) {
                return $service->vmware->vCenter;
            }
        }

        return null;
    }

    public function CreateSnapShot($product, ?string $snapshotName = null): string|array
    {
        $vcenter = $this->resolveVCenterFromProduct($product);
        if (!$vcenter) {
            return ['error' => true, 'message' => 'Không tìm thấy thông tin vCenter cho VM'];
        }

        $loginResult = $this->client->loginServer($vcenter);
        if (!$loginResult) {
            return "Login_Again";
        }

        $vmName = (string) $product->name;
        $name = $snapshotName ?? ($vmName . '_' . date('d_m_Y_H_i_s'));

        $check = $this->client->checkApiExits();
        if (!$check) {
            return "Login_Again";
        }

        try {
            Log::channel('Custom')->info("===================================================================");
            Log::channel('Custom')->info("Create Snapshot with VirtualMachine Name - $vmName - Snap #$name");

            $command = "& 'C:\CLISave\createsnapshot.ps1' -vm_name " . PowerShellEscaper::singleQuote($vmName) . ' -name ' . PowerShellEscaper::singleQuote($name);
            Log::channel('Custom')->info($command);

            $cmdResult = $this->powerShellService->executePowerCLI($command);
            Log::channel('Custom')->info("Command Result: " . $cmdResult);

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

            if (strpos($cmdResult, '[STDERR]') !== false || stripos($cmdResult, 'error') !== false) {
                return ['error' => true, 'message' => 'PowerShell command failed: ' . $cmdResult];
            }

            Log::channel('Custom')->info("After run Command |" . now());
            Log::channel('Custom')->info("===================================================================");

            $this->clearSnapshotCache($product);

            return ['error' => false, 'data' => $name];
        } catch (\Exception $error) {
            Log::channel('Custom')->error("Create Snapshot error: " . $error->getMessage());
            return ['error' => true, 'message' => $error->getMessage()];
        }
    }

    private function clearSnapshotCache($product): void
    {
        $cacheKey = CacheKey::build('snapshot', 'list', ['vm_id' => $product->id]);
        Cache::forget($cacheKey);
        Log::channel('Custom')->info("🗑️ Cleared snapshot cache for VM: {$product->name}");
    }

    public function getSnapShot($product): string|array
    {
        // ... (Similar logic, using SOAP)
        // Since SOAP logic is quite complex and self-contained in vCenter.php,
        // I'll copy it here but need to adapt $this->callSoap etc.
        // Actually, callSoap uses curl with manual implementation.
        // I should probably simplify or copy that helper too.

        // This method heavily relies on internal SOAP helpers.
        // For simplicity in this 'splitting' task, I will implement the public method
        // and add the private helpers it depends on.

        try {
            $vcenterModel = $this->resolveVCenterFromProduct($product);

            if (!$vcenterModel) {
                return ['error' => true, 'message' => 'Không tìm thấy thông tin vCenter cho VM'];
            }

            $this->client->loginServer($vcenterModel);
        } catch (\Exception $e) {
            return ['error' => true, 'message' => 'Lỗi setup credentials: ' . $e->getMessage()];
        }

        $vmId     = $product->vmware_id;
        $cacheKey = CacheKey::build('snapshot', 'list', ['vm_id' => $product->id]);
        $cachedResult = Cache::get($cacheKey);

        if ($cachedResult !== null) {
            return $cachedResult;
        }

        try {
            $sessionToken = $this->soapLogin();
            if (!$sessionToken) {
                return "Login_Again";
            }

            $snapshotInfo = $this->getVMSnapshotInfoSoap($sessionToken, $vmId);

            $snapshots = [];
            if (isset($snapshotInfo['rootSnapshotList'])) {
                $roots = $snapshotInfo['rootSnapshotList'];
                if (isset($roots['snapshot'])) {
                    $snapshots = $this->flattenSnapshotTree($roots);
                } elseif (is_array($roots)) {
                    foreach ($roots as $root) {
                        $snapshots = array_merge($snapshots, $this->flattenSnapshotTree($root));
                    }
                }
            }

            $formattedSnapshots = [];
            foreach ($snapshots as $snap) {
                $formattedSnapshots[] = [
                    'name' => $snap['name'],
                    'description' => $snap['description'] ?? '',
                    'created' => $snap['createTime'],
                    'id' => $snap['snapshot']['_'] ?? $snap['snapshot'],
                    'is_current' => false,
                    'parent_snapshot_id' => '',
                    'size_gb' => 0
                ];
            }

            $response = [
                'error' => false,
                'data' => $formattedSnapshots
            ];

            Cache::put($cacheKey, $response, now()->addMinutes(5));
            return $response;

        } catch (\Exception $e) {
            Log::channel('Custom')->error("❌ SOAP Snapshot Error: " . $e->getMessage());
            return [
                'error' => true,
                'message' => 'Lỗi lấy snapshot qua SOAP: ' . $e->getMessage()
            ];
        }
    }

    private function soapLogin()
    {
        $username = $this->client->getUsername();
        $password = $this->client->getPassword();

        $body = '<soapenv:Body>
            <Login xmlns="urn:vim25">
                <_this type="SessionManager">SessionManager</_this>
                <userName>' . htmlspecialchars($username) . '</userName>
                <password>' . htmlspecialchars($password) . '</password>
            </Login>
        </soapenv:Body>';

        $result = $this->callSoap($body);
        return $result['cookie'] ?? null;
    }

    private function getVMSnapshotInfoSoap($cookie, $vmId)
    {
        $body = '<soapenv:Body>
            <RetrievePropertiesEx xmlns="urn:vim25">
                <_this type="PropertyCollector">propertyCollector</_this>
                <specSet>
                    <propSet>
                        <type>VirtualMachine</type>
                        <all>false</all>
                        <pathSet>snapshot</pathSet>
                    </propSet>
                    <objectSet>
                        <obj type="VirtualMachine">' . $vmId . '</obj>
                    </objectSet>
                </specSet>
                <options></options>
            </RetrievePropertiesEx>
        </soapenv:Body>';

        $result = $this->callSoap($body, $cookie);

        if (isset($result['body'])) {
            try {
                $xml = simplexml_load_string($result['body']);
                if ($xml === false) return [];

                $xml->registerXPathNamespace('u', 'urn:vim25');
                $json = json_encode($xml);
                $array = json_decode($json, true);

                return $this->findSnapshotPropertyInArray($array);
            } catch (\Exception $e) {
                return [];
            }
        }
        return [];
    }

    private function findSnapshotPropertyInArray($array)
    {
        if (isset($array['rootSnapshotList'])) {
            return $array;
        }

        foreach ($array as $key => $value) {
            if (is_array($value)) {
                $found = $this->findSnapshotPropertyInArray($value);
                if ($found) {
                    return $found;
                }
            }
        }
        return [];
    }

    private function flattenSnapshotTree($node)
    {
        $list = [];
        $list[] = $node;

        if (isset($node['childSnapshotList'])) {
            $children = $node['childSnapshotList'];

            // Check if 'snapshot' key exists directly (single child wrapped)
            if (isset($children['snapshot'])) {
                // If it's an array of snapshots or single object?
                // XML conversion: if strictly one child, might be direct. if multiple, array.
                // But simplexml usually produces array if multiple same tags.
                // However, structure is usually childSnapshotList -> snapshot (array or single)

                $snaps = $children['snapshot'];
                // If $snaps has numeric keys, it's array. Else single.
                if (array_keys($snaps) !== range(0, count($snaps) - 1)) {
                    $snaps = [$snaps];
                }

                foreach ($snaps as $child) {
                     $list = array_merge($list, $this->flattenSnapshotTree($child));
                }
            }
        }
        return $list;
    }

    public function RemoveSnapShot($product, $snap = ''): string|array
    {
        $vcenter = $this->resolveVCenterFromProduct($product);

        if (!$vcenter) {
            return ['error' => true, 'message' => 'Không tìm thấy thông tin vCenter cho VM'];
        }

        $loginResult = $this->client->loginServer($vcenter);
        if (!$loginResult) {
            return "Login_Again";
        }

        $vmware_name = (string) $product->name;
        $check = $this->client->checkApiExits();
        if ($check) {
            try {
                Log::channel('Custom')->info("===================================================================");
                Log::channel('Custom')->info("Remove Snapshot with VirtualMachine Name - $vmware_name - Snap #$snap");
                Log::channel('Custom')->info("\r\n");

                $Command = "& 'C:\CLISave\deletesnap.ps1' -vm_name " . PowerShellEscaper::singleQuote($vmware_name) . ' -name ' . PowerShellEscaper::singleQuote((string) $snap);

                Log::channel('Custom')->info("$Command");

                $cmdResult = $this->powerShellService->executePowerCLI($Command);

                Log::channel('Custom')->info("Command Result: " . $cmdResult);

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

                if (strpos($cmdResult, '[STDERR]') !== false || stripos($cmdResult, 'error') !== false) {
                    return [
                        'error' => true,
                        'message' => 'PowerShell command failed: ' . $cmdResult
                    ];
                }

                Log::channel('Custom')->info("\r\n");
                Log::channel('Custom')->info("After run Command |" . now());
                Log::channel('Custom')->info("===================================================================");

                $this->clearSnapshotCache($product);

                return [
                    'error' => false
                ];
            } catch (\Exception $error) {
                Log::channel('Custom')->info("\r\n");
                Log::channel('Custom')->info("===================================================================");
                Log::channel('Custom')->info("Error Log: ");
                Log::channel('Custom')->info($error->getMessage());
                Log::channel('Custom')->info("===================================================================");
                return [
                    'error' => true,
                    'message' => $error->getMessage()
                ];
            }
        }
        return "Login_Again";
    }

    public function RevertSnapShot($product, $snap = ''): string|array
    {
        $vcenter = $this->resolveVCenterFromProduct($product);

        if (!$vcenter) {
            return ['error' => true, 'message' => 'Không tìm thấy thông tin vCenter cho VM'];
        }

        $loginResult = $this->client->loginServer($vcenter);
        if (!$loginResult) {
            return "Login_Again";
        }

        $vmware_name = (string) $product->name;
        $check = $this->client->checkApiExits();
        if ($check) {
            try {
                Log::channel('Custom')->info("===================================================================");
                Log::channel('Custom')->info("Revert Snapshot with VirtualMachine Name - $vmware_name - Snap #$snap");
                Log::channel('Custom')->info("\r\n");

                $Command = "& 'C:\CLISave\backSnap.ps1' -vm_name " . PowerShellEscaper::singleQuote($vmware_name) . ' -name ' . PowerShellEscaper::singleQuote((string) $snap);

                Log::channel('Custom')->info("$Command");

                $cmdResult = $this->powerShellService->executePowerCLI($Command);

                Log::channel('Custom')->info("Command Result: " . $cmdResult);

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

                if (strpos($cmdResult, '[STDERR]') !== false || stripos($cmdResult, 'error') !== false) {
                    return [
                        'error' => true,
                        'message' => 'PowerShell command failed: ' . $cmdResult
                    ];
                }

                Log::channel('Custom')->info("\r\n");
                Log::channel('Custom')->info("After run Command |" . now());
                Log::channel('Custom')->info("===================================================================");

                $this->clearSnapshotCache($product);

                return [
                    'error' => false
                ];
            } catch (\Exception $error) {
                Log::channel('Custom')->info("\r\n");
                Log::channel('Custom')->info("===================================================================");
                Log::channel('Custom')->info("Error Log: ");
                Log::channel('Custom')->info($error->getMessage());
                Log::channel('Custom')->info("===================================================================");
                return [
                    'error' => true,
                    'message' => $error->getMessage()
                ];
            }
        }
        return "Login_Again";
    }

    private function callSoap($soapBody, $cookie = null)
    {
        $curl = curl_init();
        $host = $this->client->apiUri;

        $headers = [
            'Content-Type: text/xml',
            'SOAPAction: "urn:vim25/2.0"'
        ];
        if ($cookie) {
            $headers[] = "Cookie: $cookie";
        }

        $payload = '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:vim25">
            ' . $soapBody . '
            </soapenv:Envelope>';

        curl_setopt_array($curl, [
            CURLOPT_URL => "https://$host/sdk",
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_ENCODING => '',
            CURLOPT_MAXREDIRS => 10,
            CURLOPT_TIMEOUT => 30,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
            CURLOPT_CUSTOMREQUEST => 'POST',
            CURLOPT_POSTFIELDS => $payload,
            CURLOPT_HTTPHEADER => $headers,
            CURLOPT_HEADER => true // We need headers for cookie
        ] + TlsHttpClientFactory::vCenterCurlOptions());

        $response = curl_exec($curl);

        $header_size = curl_getinfo($curl, CURLINFO_HEADER_SIZE);
        $header = substr($response, 0, $header_size);
        $body = substr($response, $header_size);

        curl_close($curl);

        // Parse cookie
        $cookieValue = null;
        if (preg_match_all('/^Set-Cookie:\s*([^;]*)/mi', $header, $matches)) {
            foreach ($matches[1] as $c) {
                if (strpos($c, 'vmware_soap_session') !== false) {
                    $cookieValue = $c;
                    break;
                }
            }
        }

        return ['body' => $body, 'cookie' => $cookieValue];
    }
}