"use client"

import { useState, useEffect } from "react"
import { Button } from "./ui/button"
import { Input } from "./ui/input"
import { Label } from "./ui/label"
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "./ui/card"
import { Checkbox } from "./ui/checkbox"
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from "./ui/dialog"
import {
  ShieldCheck, Globe, ExternalLink, Loader2, CheckCircle, XCircle,
  Play, Square, RotateCw, Trash2, FileText, ChevronRight, ChevronDown,
  AlertTriangle, Info, Network, Eye, EyeOff, Settings, Wifi, Key,
} from "lucide-react"
import { fetchApi } from "../lib/api-config"

interface NetworkInfo {
  interface: string
  type?: string
  address?: string
  ip?: string
  subnet: string
  prefixlen?: number
  recommended?: boolean
}

interface AppStatus {
  state: "not_installed" | "running" | "stopped" | "error"
  health: string
  uptime_seconds: number
  last_check: string
}

interface ConfigSchema {
  [key: string]: {
    type: string
    label: string
    description: string
    placeholder?: string
    default?: any
    required?: boolean
    sensitive?: boolean
    env_var?: string
    help_url?: string
    help_text?: string
    options?: Array<{ value: string; label: string; description?: string }>
    depends_on?: { field: string; values: string[] }
    flag?: string
    warning?: string
    validation?: { pattern?: string; max_length?: number; message?: string }
  }
}

interface WizardStep {
  id: string
  title: string
  description: string
  fields?: string[]
}

export function SecureGatewaySetup() {
  // State
  const [loading, setLoading] = useState(true)
  const [runtimeAvailable, setRuntimeAvailable] = useState(false)
  const [runtimeInfo, setRuntimeInfo] = useState<{ runtime: string; version: string } | null>(null)
  const [appStatus, setAppStatus] = useState<AppStatus>({ state: "not_installed", health: "unknown", uptime_seconds: 0, last_check: "" })
  const [configSchema, setConfigSchema] = useState<ConfigSchema | null>(null)
  const [wizardSteps, setWizardSteps] = useState<WizardStep[]>([])
  const [networks, setNetworks] = useState<NetworkInfo[]>([])
  
  // Wizard state
  const [showWizard, setShowWizard] = useState(false)
  const [currentStep, setCurrentStep] = useState(0)
  const [config, setConfig] = useState<Record<string, any>>({})
  const [deploying, setDeploying] = useState(false)
  const [deployProgress, setDeployProgress] = useState("")
  const [deployError, setDeployError] = useState("")
  
  // Installed state
  const [actionLoading, setActionLoading] = useState<string | null>(null)
  const [showLogs, setShowLogs] = useState(false)
  const [logs, setLogs] = useState("")
  const [logsLoading, setLogsLoading] = useState(false)
  const [showRemoveConfirm, setShowRemoveConfirm] = useState(false)
  const [showAuthKey, setShowAuthKey] = useState(false)
  
  // Post-deploy confirmation
  const [showPostDeployInfo, setShowPostDeployInfo] = useState(false)
  const [deployedConfig, setDeployedConfig] = useState<Record<string, any>>({})
  
  // Host IP for "Host Only" mode
  const [hostIp, setHostIp] = useState("")
  
  // Update Auth Key
  const [showUpdateAuthKey, setShowUpdateAuthKey] = useState(false)
  const [newAuthKey, setNewAuthKey] = useState("")
  const [updateAuthKeyLoading, setUpdateAuthKeyLoading] = useState(false)
  const [updateAuthKeyError, setUpdateAuthKeyError] = useState("")
  
  // Password visibility
  const [visiblePasswords, setVisiblePasswords] = useState<Set<string>>(new Set())

  useEffect(() => {
    loadInitialData()
  }, [])

  const loadInitialData = async () => {
    setLoading(true)
    try {
      // Load runtime info (checks for Proxmox 9.1+ OCI support)
      const runtimeRes = await fetchApi("/api/oci/runtime")
      if (runtimeRes.success && runtimeRes.available) {
        setRuntimeAvailable(true)
        setRuntimeInfo({ runtime: runtimeRes.runtime, version: runtimeRes.version })
      } else {
        // Show version requirement message
        setRuntimeInfo({ runtime: "proxmox-lxc", version: runtimeRes.version || "unknown" })
      }

      // Load app definition
      const catalogRes = await fetchApi("/api/oci/catalog/secure-gateway")
      if (catalogRes.success && catalogRes.app) {
        setConfigSchema(catalogRes.app.config_schema || {})
        setWizardSteps(catalogRes.app.ui?.wizard_steps || [])
        
        // Set defaults
        const defaults: Record<string, any> = {}
        for (const [key, field] of Object.entries(catalogRes.app.config_schema || {})) {
          if (field.default !== undefined) {
            defaults[key] = field.default
          }
        }
        setConfig(defaults)
      }

      // Load status
      await loadStatus()

      // Load networks
      const networksRes = await fetchApi("/api/oci/networks")
      if (networksRes.success) {
        setNetworks(networksRes.networks || [])
        // Get host IP for "Host Only" mode
        const primaryNetwork = networksRes.networks?.find((n: NetworkInfo) => n.recommended) || networksRes.networks?.[0]
        // Backend returns "ip" field with the host IP address
        const hostIpValue = primaryNetwork?.ip || primaryNetwork?.address
        if (hostIpValue) {
          // Remove CIDR notation if present (e.g., "192.168.0.55/24" -> "192.168.0.55")
          const ip = hostIpValue.split("/")[0]
          setHostIp(ip)
        }
      }
    } catch (err) {
      console.error("Failed to load data:", err)
    } finally {
      setLoading(false)
    }
  }

  const loadStatus = async () => {
    try {
      const statusRes = await fetchApi("/api/oci/status/secure-gateway")
      if (statusRes.success) {
        setAppStatus(statusRes.status)
      }
    } catch (err) {
      // Not installed is ok
    }
  }

  const handleDeploy = async () => {
    setDeploying(true)
    setDeployError("")
    setDeployProgress("Preparing deployment...")

    try {
      // Validate required fields
      const step = wizardSteps[currentStep]
      if (step?.fields) {
        for (const fieldName of step.fields) {
          const field = configSchema?.[fieldName]
          if (field?.required && !config[fieldName]) {
            setDeployError(`${field.label} is required`)
            setDeploying(false)
            return
          }
        }
      }

      // Prepare config based on access_mode
      const deployConfig = { ...config }
      
      if (config.access_mode === "host_only" && hostIp) {
        // Host only: just the host IP
        deployConfig.advertise_routes = [`${hostIp}/32`]
      } else if (config.access_mode === "proxmox_network") {
        // Proxmox network: use the recommended network (should already be set)
        if (!deployConfig.advertise_routes?.length) {
          const recommendedNetwork = networks.find((n) => n.recommended) || networks[0]
          if (recommendedNetwork) {
            deployConfig.advertise_routes = [recommendedNetwork.subnet]
          }
        }
      }
      // For "custom", the user has already selected networks manually

      setDeployProgress("Creating LXC container...")
      
      const result = await fetchApi("/api/oci/deploy", {
        method: "POST",
        body: JSON.stringify({
          app_id: "secure-gateway",
          config: deployConfig
        })
      })

      if (!result.success) {
        // Make runtime errors more user-friendly
        let errorMsg = result.message || "Deployment failed"
        if (errorMsg.includes("9.1") || errorMsg.includes("OCI") || errorMsg.includes("not supported")) {
          errorMsg = "OCI containers require Proxmox VE 9.1 or later. Please upgrade your Proxmox installation to use this feature."
        }
        setDeployError(errorMsg)
        setDeploying(false)
        return
      }

      setDeployProgress("Gateway deployed successfully!")
      
      // Wait and reload status, then show post-deploy info
      setTimeout(async () => {
        await loadStatus()
        setShowWizard(false)
        setDeploying(false)
        setCurrentStep(0)
        
        // Show post-deploy confirmation - always show when access mode is set (routes need approval)
        const needsApproval = deployConfig.access_mode && deployConfig.access_mode !== "none"
        if (needsApproval) {
          // Ensure advertise_routes is set for the dialog
          const finalConfig = { ...deployConfig }
          if (deployConfig.access_mode === "host_only" && hostIp) {
            finalConfig.advertise_routes = [`${hostIp}/32`]
          }
          setDeployedConfig(finalConfig)
          setShowPostDeployInfo(true)
        }
      }, 2000)

    } catch (err: any) {
      setDeployError(err.message || "Deployment failed")
      setDeploying(false)
    }
  }

  const handleAction = async (action: "start" | "stop" | "restart") => {
    setActionLoading(action)
    try {
      const result = await fetchApi(`/api/oci/installed/secure-gateway/${action}`, {
        method: "POST"
      })
      if (result.success) {
        await loadStatus()
      }
    } catch (err) {
      console.error(`Failed to ${action}:`, err)
    } finally {
      setActionLoading(null)
    }
  }

  const handleUpdateAuthKey = async () => {
    if (!newAuthKey.trim()) {
      setUpdateAuthKeyError("Auth Key is required")
      return
    }
    
    setUpdateAuthKeyLoading(true)
    setUpdateAuthKeyError("")
    
    try {
      const result = await fetchApi("/api/oci/installed/secure-gateway/update-auth-key", {
        method: "POST",
        body: JSON.stringify({
          auth_key: newAuthKey.trim()
        })
      })
      
      if (!result.success) {
        setUpdateAuthKeyError(result.message || "Failed to update auth key")
        setUpdateAuthKeyLoading(false)
        return
      }
      
      // Success - close dialog and reload status
      setShowUpdateAuthKey(false)
      setNewAuthKey("")
      await loadStatus()
    } catch (err: any) {
      setUpdateAuthKeyError(err.message || "Failed to update auth key")
    } finally {
      setUpdateAuthKeyLoading(false)
    }
  }

  const handleRemove = async () => {
    setActionLoading("remove")
    try {
      const result = await fetchApi("/api/oci/installed/secure-gateway?remove_data=false", {
        method: "DELETE"
      })
      if (result.success) {
        setAppStatus({ state: "not_installed", health: "unknown", uptime_seconds: 0, last_check: "" })
        setShowRemoveConfirm(false)
      }
    } catch (err) {
      console.error("Failed to remove:", err)
    } finally {
      setActionLoading(null)
    }
  }

  const loadLogs = async () => {
    setLogsLoading(true)
    try {
      const result = await fetchApi("/api/oci/installed/secure-gateway/logs?lines=100")
      if (result.success) {
        setLogs(result.logs || "No logs available")
      }
    } catch (err) {
      setLogs("Failed to load logs")
    } finally {
      setLogsLoading(false)
    }
  }

  const formatUptime = (seconds: number): string => {
    if (seconds < 60) return `${seconds}s`
    if (seconds < 3600) return `${Math.floor(seconds / 60)}m`
    if (seconds < 86400) return `${Math.floor(seconds / 3600)}h ${Math.floor((seconds % 3600) / 60)}m`
    return `${Math.floor(seconds / 86400)}d ${Math.floor((seconds % 86400) / 3600)}h`
  }

  const renderField = (fieldName: string) => {
    const field = configSchema?.[fieldName]
    if (!field) return null

    // Check depends_on
    if (field.depends_on) {
      const depValue = config[field.depends_on.field]
      if (!field.depends_on.values.includes(depValue)) {
        return null
      }
    }

    const isVisible = visiblePasswords.has(fieldName)

    switch (field.type) {
      case "password":
        return (
          <div key={fieldName} className="space-y-2">
            <Label htmlFor={fieldName} className="text-sm font-medium">
              {field.label}
              {field.required && <span className="text-red-500 ml-1">*</span>}
            </Label>
            <div className="relative">
              <Input
                id={fieldName}
                type={isVisible ? "text" : "password"}
                value={config[fieldName] || ""}
                onChange={(e) => setConfig({ ...config, [fieldName]: e.target.value })}
                placeholder={field.placeholder}
                className="pr-10 bg-background border-border"
              />
              <button
                type="button"
                onClick={() => {
                  const newSet = new Set(visiblePasswords)
                  if (isVisible) newSet.delete(fieldName)
                  else newSet.add(fieldName)
                  setVisiblePasswords(newSet)
                }}
                className="absolute right-3 top-1/2 -translate-y-1/2 text-muted-foreground hover:text-foreground"
              >
                {isVisible ? <EyeOff className="h-4 w-4" /> : <Eye className="h-4 w-4" />}
              </button>
            </div>
            <p className="text-xs text-muted-foreground">{field.description}</p>
            {field.help_url && (
              <a
                href={field.help_url}
                target="_blank"
                rel="noopener noreferrer"
                className="text-xs text-cyan-500 hover:text-cyan-400 inline-flex items-center gap-1"
              >
                {field.help_text || "Learn more"} <ExternalLink className="h-3 w-3" />
              </a>
            )}
          </div>
        )

      case "text":
        return (
          <div key={fieldName} className="space-y-2">
            <Label htmlFor={fieldName} className="text-sm font-medium">
              {field.label}
              {field.required && <span className="text-red-500 ml-1">*</span>}
            </Label>
            <Input
              id={fieldName}
              type="text"
              value={config[fieldName] || ""}
              onChange={(e) => setConfig({ ...config, [fieldName]: e.target.value })}
              placeholder={field.placeholder}
              className="bg-background border-border"
            />
            <p className="text-xs text-muted-foreground">{field.description}</p>
          </div>
        )

      case "select":
        // Special handling for access_mode to auto-select networks
        const handleSelectChange = (value: string) => {
          const newConfig = { ...config, [fieldName]: value }
          
          // When access_mode changes to proxmox_network, auto-select the recommended network
          if (fieldName === "access_mode" && value === "proxmox_network") {
            const recommendedNetwork = networks.find((n) => n.recommended) || networks[0]
            if (recommendedNetwork) {
              newConfig.advertise_routes = [recommendedNetwork.subnet]
            }
          }
          // Clear routes when switching to host_only
          if (fieldName === "access_mode" && value === "host_only") {
            newConfig.advertise_routes = []
          }
          // Clear routes when switching to custom (user will select manually)
          if (fieldName === "access_mode" && value === "custom") {
            newConfig.advertise_routes = []
          }
          
          setConfig(newConfig)
        }
        
        return (
          <div key={fieldName} className="space-y-3">
            <Label className="text-sm font-medium">
              {field.label}
              {field.required && <span className="text-red-500 ml-1">*</span>}
            </Label>
            <div className="space-y-2">
              {field.options?.map((opt) => (
                <div
                  key={opt.value}
                  onClick={() => handleSelectChange(opt.value)}
                  className={`p-3 rounded-lg border cursor-pointer transition-colors ${
                    config[fieldName] === opt.value
                      ? "border-cyan-500 bg-cyan-500/10"
                      : "border-border hover:border-muted-foreground/50"
                  }`}
                >
                  <div className="flex items-center gap-3">
                    <div className={`w-4 h-4 rounded-full border-2 flex items-center justify-center ${
                      config[fieldName] === opt.value ? "border-cyan-500" : "border-muted-foreground"
                    }`}>
                      {config[fieldName] === opt.value && (
                        <div className="w-2 h-2 rounded-full bg-cyan-500" />
                      )}
                    </div>
                    <div className="flex-1">
                      <p className="font-medium text-sm">{opt.label}</p>
                      {opt.description && (
                        <p className="text-xs text-muted-foreground">{opt.description}</p>
                      )}
                      {/* Show selected network for proxmox_network */}
                      {fieldName === "access_mode" && opt.value === "proxmox_network" && config[fieldName] === "proxmox_network" && (
                        <p className="text-xs text-cyan-400 mt-1 flex items-center gap-1">
                          <Network className="h-3 w-3" />
                          {networks.find((n) => n.recommended)?.subnet || networks[0]?.subnet || "No network detected"}
                        </p>
                      )}
                    </div>
                  </div>
                </div>
              ))}
            </div>
          </div>
        )

      case "networks":
        return (
          <div key={fieldName} className="space-y-3">
            <Label className="text-sm font-medium">
              {field.label}
            </Label>
            <p className="text-xs text-muted-foreground">{field.description}</p>
            <div className="space-y-2 max-h-48 overflow-y-auto">
              {networks.length === 0 ? (
                <p className="text-sm text-muted-foreground p-3 bg-muted/30 rounded">
                  No networks detected
                </p>
              ) : (
                networks.map((net) => {
                  const selected = (config[fieldName] || []).includes(net.subnet)
                  return (
                    <div
                      key={net.subnet}
                      onClick={() => {
                        const current = config[fieldName] || []
                        const updated = selected
                          ? current.filter((s: string) => s !== net.subnet)
                          : [...current, net.subnet]
                        setConfig({ ...config, [fieldName]: updated })
                      }}
                      className={`p-3 rounded-lg border cursor-pointer transition-colors flex items-center gap-3 ${
                        selected
                          ? "border-cyan-500 bg-cyan-500/10"
                          : "border-border hover:border-muted-foreground/50"
                      }`}
                    >
                      <Checkbox checked={selected} className="pointer-events-none" />
                      <div className="flex-1">
                        <div className="flex items-center gap-2">
                          <Network className="h-4 w-4 text-muted-foreground" />
                          <span className="font-mono text-sm">{net.subnet}</span>
                          {net.recommended && (
                            <span className="text-[10px] px-1.5 py-0.5 rounded bg-green-500/10 text-green-500">
                              Recommended
                            </span>
                          )}
                        </div>
                        <p className="text-xs text-muted-foreground">
                          {net.interface} ({net.type})
                        </p>
                      </div>
                    </div>
                  )
                })
              )}
            </div>
          </div>
        )

      case "boolean":
        return (
          <div key={fieldName} className="space-y-2">
            <div
              onClick={() => setConfig({ ...config, [fieldName]: !config[fieldName] })}
              className={`p-3 rounded-lg border cursor-pointer transition-colors flex items-start gap-3 ${
                config[fieldName]
                  ? "border-cyan-500 bg-cyan-500/10"
                  : "border-border hover:border-muted-foreground/50"
              }`}
            >
              <Checkbox checked={config[fieldName] || false} className="pointer-events-none mt-0.5" />
              <div>
                <p className="font-medium text-sm">{field.label}</p>
                <p className="text-xs text-muted-foreground">{field.description}</p>
                {field.warning && config[fieldName] && (
                  <p className="text-xs text-cyan-400 mt-2 flex items-start gap-1.5 bg-cyan-500/10 p-2 rounded">
                    <Info className="h-3 w-3 mt-0.5 flex-shrink-0" />
                    {field.warning}
                  </p>
                )}
              </div>
            </div>
          </div>
        )

      default:
        return null
    }
  }

  const renderWizardContent = () => {
    const step = wizardSteps[currentStep]
    if (!step) return null

    if (step.id === "intro") {
      return (
        <div className="space-y-6">
          <div className="flex justify-center">
            <div className="w-20 h-20 rounded-full bg-cyan-500/10 flex items-center justify-center">
              <ShieldCheck className="h-10 w-10 text-cyan-500" />
            </div>
          </div>
          <div className="text-center space-y-2">
            <h3 className="text-lg font-semibold">Secure Remote Access</h3>
            <p className="text-sm text-muted-foreground max-w-md mx-auto">
              Deploy a VPN gateway using Tailscale for secure, zero-trust access to your Proxmox infrastructure without opening ports.
            </p>
          </div>
          <div className="bg-muted/30 rounded-lg p-4 space-y-3">
            <h4 className="text-sm font-medium">What you{"'"}ll get:</h4>
            <ul className="space-y-2 text-sm text-muted-foreground">
              <li className="flex items-center gap-2">
                <CheckCircle className="h-4 w-4 text-green-500 flex-shrink-0" />
                Access ProxMenux Monitor from anywhere
              </li>
              <li className="flex items-center gap-2">
                <CheckCircle className="h-4 w-4 text-green-500 flex-shrink-0" />
                Secure access to Proxmox web UI
              </li>
              <li className="flex items-center gap-2">
                <CheckCircle className="h-4 w-4 text-green-500 flex-shrink-0" />
                Optionally expose VMs and LXC containers
              </li>
              <li className="flex items-center gap-2">
                <CheckCircle className="h-4 w-4 text-green-500 flex-shrink-0" />
                End-to-end encryption
              </li>
              <li className="flex items-center gap-2">
                <CheckCircle className="h-4 w-4 text-green-500 flex-shrink-0" />
                No port forwarding required
              </li>
            </ul>
          </div>
          <div className="bg-cyan-500/10 border border-cyan-500/20 rounded-lg p-3">
            <p className="text-xs text-cyan-400 flex items-start gap-2">
              <Info className="h-4 w-4 flex-shrink-0 mt-0.5" />
              You{"'"}ll need a free Tailscale account. If you don{"'"}t have one, you can create it at{" "}
              <a href="https://tailscale.com" target="_blank" rel="noopener noreferrer" className="underline hover:text-cyan-300">
                tailscale.com
              </a>
            </p>
          </div>
        </div>
      )
    }

    if (step.id === "deploy") {
      return (
        <div className="space-y-6">
          <div className="text-center space-y-2">
            <h3 className="text-lg font-semibold">Review & Deploy</h3>
            <p className="text-sm text-muted-foreground">
              Review your configuration before deploying the gateway.
            </p>
          </div>
          
          <div className="bg-muted/30 rounded-lg p-4 space-y-3">
            <h4 className="text-sm font-medium">Configuration Summary</h4>
            <div className="space-y-2 text-sm">
              <div className="flex justify-between">
                <span className="text-muted-foreground">Hostname:</span>
                <span className="font-mono">{config.hostname || "proxmox-gateway"}</span>
              </div>
              <div className="flex justify-between">
                <span className="text-muted-foreground">Access Mode:</span>
                <span>{config.access_mode === "host_only" ? "Host Only" : config.access_mode === "proxmox_network" ? "Proxmox Network" : "Custom Networks"}</span>
              </div>
              {config.access_mode === "host_only" && hostIp && (
                <div className="flex justify-between">
                  <span className="text-muted-foreground">Host Access:</span>
                  <span className="text-right font-mono text-xs">{hostIp}/32</span>
                </div>
              )}
              {(config.access_mode === "proxmox_network" || config.access_mode === "custom") && config.advertise_routes?.length > 0 && (
                <div className="flex justify-between">
                  <span className="text-muted-foreground">Networks:</span>
                  <span className="text-right font-mono text-xs">{config.advertise_routes.join(", ")}</span>
                </div>
              )}
              <div className="flex justify-between">
                <span className="text-muted-foreground">Exit Node:</span>
                <span>{config.exit_node ? "Yes" : "No"}</span>
              </div>
              <div className="flex justify-between">
                <span className="text-muted-foreground">Accept Routes:</span>
                <span>{config.accept_routes ? "Yes" : "No"}</span>
              </div>
            </div>
          </div>

          {/* Approval notice */}
          {(config.access_mode && config.access_mode !== "none") && !deploying && (
            <div className="bg-cyan-500/10 border border-cyan-500/20 rounded-lg p-3 space-y-2">
              <p className="text-xs text-cyan-400 flex items-start gap-2">
                <Info className="h-4 w-4 flex-shrink-0 mt-0.5" />
                <span>
                  <strong>Important:</strong> After deployment, you must approve the subnet route in Tailscale Admin for remote access to work.
                  {config.exit_node && <span> You{"'"}ll also need to approve the exit node.</span>}
                </span>
              </p>
              <p className="text-xs text-muted-foreground ml-6">
                We{"'"}ll show you exactly what to do after the gateway is deployed.
              </p>
            </div>
          )}

          {deploying && (
            <div className="bg-cyan-500/10 border border-cyan-500/20 rounded-lg p-4">
              <div className="flex items-center gap-3">
                <Loader2 className="h-5 w-5 text-cyan-500 animate-spin" />
                <span className="text-sm">{deployProgress}</span>
              </div>
            </div>
          )}

          {deployError && (
            <div className="bg-red-500/10 border border-red-500/20 rounded-lg p-3">
              <p className="text-sm text-red-500 flex items-center gap-2">
                <XCircle className="h-4 w-4" />
                {deployError}
              </p>
            </div>
          )}
        </div>
      )
    }

    // Regular step with fields
    return (
      <div className="space-y-6">
        <div className="text-center space-y-2">
          <h3 className="text-lg font-semibold">{step.title}</h3>
          <p className="text-sm text-muted-foreground">{step.description}</p>
        </div>
        <div className="space-y-4">
          {step.fields?.map((fieldName) => renderField(fieldName))}
        </div>
      </div>
    )
  }

  // Loading state
  if (loading) {
    return (
      <Card className="border-border bg-card">
        <CardHeader className="pb-3">
          <div className="flex items-center gap-2">
            <ShieldCheck className="h-5 w-5 text-cyan-500" />
            <CardTitle className="text-base">Secure Gateway</CardTitle>
          </div>
        </CardHeader>
        <CardContent>
          <div className="flex items-center justify-center py-8">
            <Loader2 className="h-6 w-6 animate-spin text-muted-foreground" />
          </div>
        </CardContent>
      </Card>
    )
  }

  // Installed state
  if (appStatus.state !== "not_installed") {
    const isRunning = appStatus.state === "running"
    const isStopped = appStatus.state === "stopped"
    const isError = appStatus.state === "error"

    return (
      <>
        <Card className="border-border bg-card">
          <CardHeader className="pb-3">
            <div className="flex items-center justify-between">
              <div className="flex items-center gap-2">
                <ShieldCheck className="h-5 w-5 text-cyan-500" />
                <CardTitle className="text-base">Secure Gateway</CardTitle>
              </div>
              <div className={`flex items-center gap-1.5 px-2 py-1 rounded-full text-xs font-medium ${
                isRunning ? "bg-green-500/10 text-green-500" :
                isStopped ? "bg-yellow-500/10 text-yellow-500" :
                "bg-red-500/10 text-red-500"
              }`}>
                {isRunning ? <Wifi className="h-3 w-3" /> :
                 isStopped ? <Square className="h-3 w-3" /> :
                 <XCircle className="h-3 w-3" />}
                {isRunning ? "Connected" : isStopped ? "Stopped" : "Error"}
              </div>
            </div>
            <CardDescription>Tailscale VPN Gateway</CardDescription>
          </CardHeader>
          <CardContent className="space-y-4">
            {/* Status info */}
            {isRunning && appStatus.uptime_seconds > 0 && (
              <div className="text-xs text-muted-foreground">
                Uptime: {formatUptime(appStatus.uptime_seconds)}
              </div>
            )}

            {/* Actions */}
            <div className="flex flex-wrap gap-2">
              {isStopped && (
                <Button
                  size="sm"
                  onClick={() => handleAction("start")}
                  disabled={actionLoading !== null}
                  className="bg-green-600 hover:bg-green-700"
                >
                  {actionLoading === "start" ? (
                    <Loader2 className="h-4 w-4 animate-spin mr-1" />
                  ) : (
                    <Play className="h-4 w-4 mr-1" />
                  )}
                  Start
                </Button>
              )}
              {isRunning && (
                <>
                  <Button
                    size="sm"
                    variant="outline"
                    onClick={() => handleAction("stop")}
                    disabled={actionLoading !== null}
                  >
                    {actionLoading === "stop" ? (
                      <Loader2 className="h-4 w-4 animate-spin mr-1" />
                    ) : (
                      <Square className="h-4 w-4 mr-1" />
                    )}
                    Stop
                  </Button>
                  <Button
                    size="sm"
                    variant="outline"
                    onClick={() => handleAction("restart")}
                    disabled={actionLoading !== null}
                  >
                    {actionLoading === "restart" ? (
                      <Loader2 className="h-4 w-4 animate-spin mr-1" />
                    ) : (
                      <RotateCw className="h-4 w-4 mr-1" />
                    )}
                    Restart
                  </Button>
                </>
              )}
              <Button
                size="sm"
                variant="outline"
                onClick={() => {
                  setShowLogs(true)
                  loadLogs()
                }}
              >
                <FileText className="h-4 w-4 mr-1" />
                Logs
              </Button>
              <Button
                size="sm"
                variant="outline"
                className="text-red-500 hover:text-red-400 hover:bg-red-500/10"
                onClick={() => setShowRemoveConfirm(true)}
                disabled={actionLoading !== null}
              >
                <Trash2 className="h-4 w-4 mr-1" />
                Remove
              </Button>
            </div>

            {/* Update Auth Key button */}
            <div className="pt-2 border-t border-border flex items-center justify-between">
              <Button
                size="sm"
                variant="ghost"
                onClick={() => setShowUpdateAuthKey(true)}
                disabled={actionLoading !== null}
                className="text-xs h-7 px-2"
              >
                <Key className="h-3 w-3 mr-1" />
                Update Auth Key
              </Button>
              <a
                href="https://login.tailscale.com/admin/machines"
                target="_blank"
                rel="noopener noreferrer"
                className="text-xs text-cyan-500 hover:text-cyan-400 inline-flex items-center gap-1"
              >
                Open Tailscale Admin <ExternalLink className="h-3 w-3" />
              </a>
            </div>
          </CardContent>
        </Card>

        {/* Logs Dialog */}
        <Dialog open={showLogs} onOpenChange={setShowLogs}>
          <DialogContent className="max-w-2xl">
            <DialogHeader>
              <DialogTitle>Secure Gateway Logs</DialogTitle>
              <DialogDescription>Recent container logs</DialogDescription>
            </DialogHeader>
            <div className="bg-black/50 rounded-lg p-4 max-h-96 overflow-auto">
              {logsLoading ? (
                <div className="flex items-center justify-center py-8">
                  <Loader2 className="h-6 w-6 animate-spin text-muted-foreground" />
                </div>
              ) : (
                <pre className="text-xs font-mono text-green-400 whitespace-pre-wrap">
                  {logs || "No logs available"}
                </pre>
              )}
            </div>
            <div className="flex justify-end">
              <Button variant="outline" size="sm" onClick={loadLogs}>
                <RotateCw className="h-4 w-4 mr-1" />
                Refresh
              </Button>
            </div>
          </DialogContent>
        </Dialog>

        {/* Remove Confirm Dialog */}
        <Dialog open={showRemoveConfirm} onOpenChange={setShowRemoveConfirm}>
          <DialogContent>
            <DialogHeader>
              <DialogTitle>Remove Secure Gateway?</DialogTitle>
              <DialogDescription>
                This will stop and remove the gateway container. Your Tailscale state will be preserved for re-deployment.
              </DialogDescription>
            </DialogHeader>
            <div className="flex justify-end gap-2">
              <Button variant="outline" onClick={() => setShowRemoveConfirm(false)}>
                Cancel
              </Button>
              <Button
                variant="destructive"
                onClick={handleRemove}
                disabled={actionLoading === "remove"}
              >
                {actionLoading === "remove" ? (
                  <Loader2 className="h-4 w-4 animate-spin mr-1" />
                ) : (
                  <Trash2 className="h-4 w-4 mr-1" />
                )}
                Remove
              </Button>
            </div>
          </DialogContent>
        </Dialog>

        {/* Update Auth Key Dialog */}
        <Dialog open={showUpdateAuthKey} onOpenChange={(open) => {
          setShowUpdateAuthKey(open)
          if (!open) {
            setNewAuthKey("")
            setUpdateAuthKeyError("")
          }
        }}>
          <DialogContent className="max-w-md">
            <DialogHeader>
              <DialogTitle className="flex items-center gap-2">
                <Key className="h-5 w-5 text-cyan-500" />
                Update Auth Key
              </DialogTitle>
              <DialogDescription>
                Enter a new Tailscale auth key to re-authenticate the gateway. This is useful if your previous key has expired.
              </DialogDescription>
            </DialogHeader>
            
            <div className="space-y-4">
              <div className="space-y-2">
                <label className="text-sm font-medium">New Auth Key</label>
                <Input
                  type="password"
                  value={newAuthKey}
                  onChange={(e) => setNewAuthKey(e.target.value)}
                  placeholder="tskey-auth-..."
                  className="font-mono text-sm"
                />
                <p className="text-xs text-muted-foreground">
                  Generate a new key at{" "}
                  <a
                    href="https://login.tailscale.com/admin/settings/keys"
                    target="_blank"
                    rel="noopener noreferrer"
                    className="text-cyan-500 hover:text-cyan-400 underline"
                  >
                    Tailscale Admin &gt; Settings &gt; Keys
                  </a>
                </p>
              </div>
              
              {updateAuthKeyError && (
                <div className="bg-red-500/10 border border-red-500/20 rounded-lg p-3">
                  <p className="text-xs text-red-500">{updateAuthKeyError}</p>
                </div>
              )}
            </div>
            
            <div className="flex justify-end gap-2 pt-2">
              <Button variant="outline" onClick={() => setShowUpdateAuthKey(false)}>
                Cancel
              </Button>
              <Button
                onClick={handleUpdateAuthKey}
                disabled={updateAuthKeyLoading || !newAuthKey.trim()}
                className="bg-cyan-600 hover:bg-cyan-700"
              >
                {updateAuthKeyLoading ? (
                  <Loader2 className="h-4 w-4 animate-spin mr-2" />
                ) : (
                  <Key className="h-4 w-4 mr-2" />
                )}
                Update Key
              </Button>
            </div>
          </DialogContent>
        </Dialog>

        {/* Post-Deploy Info Dialog */}
        <Dialog open={showPostDeployInfo} onOpenChange={setShowPostDeployInfo}>
          <DialogContent className="max-w-md">
            <DialogHeader>
              <DialogTitle className="flex items-center gap-2">
                <CheckCircle className="h-5 w-5 text-green-500" />
                Gateway Deployed Successfully
              </DialogTitle>
              <DialogDescription>
                One more step to complete the setup
              </DialogDescription>
            </DialogHeader>
            
            <div className="space-y-4">
              <div className="bg-cyan-500/10 border border-cyan-500/20 rounded-lg p-4">
                <p className="text-sm font-medium text-cyan-400 flex items-center gap-2 mb-2">
                  <Info className="h-4 w-4" />
                  Next Step: Approve in Tailscale Admin
                </p>
                <p className="text-sm text-muted-foreground mb-3">
                  You need to approve the following settings in your Tailscale admin console for them to take effect:
                </p>
                <ul className="space-y-2 text-sm">
                  {deployedConfig.advertise_routes?.length > 0 && (
                    <li className="flex items-start gap-2">
                      <Network className="h-4 w-4 text-cyan-500 mt-0.5 flex-shrink-0" />
                      <div>
                        <span className="font-medium">Subnet Routes:</span>
                        <span className="text-muted-foreground ml-1">
                          {deployedConfig.advertise_routes.join(", ")}
                        </span>
                      </div>
                    </li>
                  )}
                  {deployedConfig.exit_node && (
                    <li className="flex items-start gap-2">
                      <Globe className="h-4 w-4 text-cyan-500 mt-0.5 flex-shrink-0" />
                      <div>
                        <span className="font-medium">Exit Node:</span>
                        <span className="text-muted-foreground ml-1">
                          Route all internet traffic
                        </span>
                      </div>
                    </li>
                  )}
                </ul>
              </div>
              
              <div className="bg-muted/30 rounded-lg p-4 space-y-2">
                <p className="text-sm font-medium">How to approve:</p>
                <ol className="text-sm text-muted-foreground space-y-2 list-decimal list-inside">
                  <li>Click the button below to open Tailscale Admin</li>
                  <li>Find <span className="font-mono text-cyan-400">{deployedConfig.hostname || "proxmox-gateway"}</span> in the machines list</li>
                  <li>Click on it to open machine details</li>
                  <li>In the <strong>Subnets</strong> section, click <strong>Edit</strong> and enable the route</li>
                  {deployedConfig.exit_node && (
                    <li>In <strong>Routing Settings</strong>, enable <strong>Exit Node</strong></li>
                  )}
                </ol>
              </div>
              
              <div className="bg-green-500/10 border border-green-500/20 rounded-lg p-3">
                <p className="text-xs text-green-400">
                  Once approved, you can access your Proxmox host at{" "}
                  <span className="font-mono">{deployedConfig.advertise_routes?.[0]?.replace("/32", "") || hostIp}:8006</span> (Proxmox UI) or{" "}
                  <span className="font-mono">{deployedConfig.advertise_routes?.[0]?.replace("/32", "") || hostIp}:8008</span> (ProxMenux Monitor) from any device with Tailscale.
                </p>
              </div>
            </div>
            
            <div className="flex justify-end gap-2 pt-2">
              <Button variant="outline" onClick={() => setShowPostDeployInfo(false)}>
                I{"'"}ll do it later
              </Button>
              <Button
                onClick={() => {
                  window.open("https://login.tailscale.com/admin/machines", "_blank")
                  setShowPostDeployInfo(false)
                }}
                className="bg-cyan-600 hover:bg-cyan-700"
              >
                Open Tailscale Admin
                <ExternalLink className="h-4 w-4 ml-2" />
              </Button>
            </div>
          </DialogContent>
        </Dialog>
      </>
    )
  }

  // Not installed state
  return (
    <>
      <Card className="border-border bg-card">
        <CardHeader className="pb-3">
          <div className="flex items-center gap-2">
            <ShieldCheck className="h-5 w-5 text-cyan-500" />
            <CardTitle className="text-base">Secure Gateway</CardTitle>
          </div>
          <CardDescription>VPN access without opening ports</CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          <p className="text-sm text-muted-foreground">
            Deploy a Tailscale VPN gateway for secure remote access to your Proxmox infrastructure. No port forwarding required.
          </p>
          
          {runtimeAvailable ? (
            <div className="flex items-center gap-2 text-xs text-muted-foreground">
              <CheckCircle className="h-3.5 w-3.5 text-green-500" />
              <span>Proxmox VE {runtimeInfo?.version} - OCI support available</span>
            </div>
          ) : (
            <div className="flex items-center gap-2 text-xs text-yellow-500">
              <AlertTriangle className="h-3.5 w-3.5" />
              <span>Requires Proxmox VE 9.1+ (current: {runtimeInfo?.version || "unknown"})</span>
            </div>
          )}

          <Button
            onClick={() => setShowWizard(true)}
            className="bg-cyan-600 hover:bg-cyan-700"
            disabled={!runtimeAvailable}
          >
            <ShieldCheck className="h-4 w-4 mr-2" />
            Deploy Secure Gateway
          </Button>
        </CardContent>
      </Card>

      {/* Wizard Dialog */}
      <Dialog open={showWizard} onOpenChange={(open) => {
        if (!deploying) {
          setShowWizard(open)
          if (!open) {
            setCurrentStep(0)
            setDeployError("")
          }
        }
      }}>
        <DialogContent className="max-w-lg">
          <DialogHeader>
            <DialogTitle className="flex items-center gap-2">
              <ShieldCheck className="h-5 w-5 text-cyan-500" />
              Secure Gateway Setup
            </DialogTitle>
          </DialogHeader>

          {/* Progress indicator - filter out "options" step if using Proxmox Only */}
          <div className="flex items-center gap-1 mb-4">
            {wizardSteps
              .filter((step) => !(config.access_mode === "host_only" && step.id === "options"))
              .map((step, idx) => {
                // Recalculate the actual step index accounting for skipped steps
                const actualIdx = wizardSteps.findIndex((s) => s.id === step.id)
                const adjustedCurrentStep = config.access_mode === "host_only" 
                  ? (currentStep > wizardSteps.findIndex((s) => s.id === "options") ? currentStep - 1 : currentStep)
                  : currentStep
                return (
                  <div
                    key={step.id}
                    className={`flex-1 h-1 rounded-full transition-colors ${
                      idx < adjustedCurrentStep ? "bg-cyan-500" :
                      idx === adjustedCurrentStep ? "bg-cyan-500" :
                      "bg-muted"
                    }`}
                  />
                )
              })}
          </div>

          {renderWizardContent()}

          {/* Navigation */}
          <div className="flex justify-between pt-4 border-t border-border">
            <Button
              variant="outline"
              onClick={() => {
                // Skip "options" step when going back if using "Proxmox Only"
                let prevStep = currentStep - 1
                if (config.access_mode === "host_only" && wizardSteps[prevStep]?.id === "options") {
                  prevStep = prevStep - 1
                }
                setCurrentStep(Math.max(0, prevStep))
              }}
              disabled={currentStep === 0 || deploying}
            >
              Back
            </Button>
            
            {currentStep < wizardSteps.length - 1 ? (
              <Button
                onClick={() => {
                  // Skip "options" step when using "Proxmox Only"
                  let nextStep = currentStep + 1
                  if (config.access_mode === "host_only" && wizardSteps[nextStep]?.id === "options") {
                    nextStep = nextStep + 1
                  }
                  setCurrentStep(nextStep)
                }}
                className="bg-cyan-600 hover:bg-cyan-700"
              >
                Continue
                <ChevronRight className="h-4 w-4 ml-1" />
              </Button>
            ) : (
              <Button
                onClick={handleDeploy}
                disabled={deploying}
                className="bg-cyan-600 hover:bg-cyan-700"
              >
                {deploying ? (
                  <>
                    <Loader2 className="h-4 w-4 animate-spin mr-2" />
                    Deploying...
                  </>
                ) : (
                  <>
                    <Play className="h-4 w-4 mr-2" />
                    Deploy Gateway
                  </>
                )}
              </Button>
            )}
          </div>
        </DialogContent>
      </Dialog>
    </>
  )
}
