/**
 * SSH IPC Handlers
 * 处理 SSH 连接、Shell、会话、端口转发相关 IPC
 * 安全增强：规范化错误处理，不暴露敏感信息
 */

import { ipcMain, IpcMainInvokeEvent } from 'electron'
import type { SSHService } from '../services/ssh-service'
import type { ZmodemService } from '../services/zmodem-service'
import { createLogger } from '../utils/logger'

const logger = createLogger('SSH_IPC')

// 生产环境日志：使用结构化日志，不输出敏感信息
const DEBUG = process.env.NODE_ENV === 'development'
function debug(...args: unknown[]) {
  if (DEBUG) logger.debug('[SSH_IPC]', ...args)
}
function logHeader(msg: string) {
  logger.info(`[${msg}]`)
}
function logInfo(label: string, value: unknown) {
  logger.info(`${label}: ${value}`)
}
function logSuccess(msg: string) {
  logger.info(`[OK] ${msg}`)
}
function logError(msg: string) {
  logger.error(msg)
}

// IPC channel names
export const SSH_CHANNELS = {
  CONNECT: 'ssh:connect',
  DISCONNECT: 'ssh:disconnect',
  EXEC: 'ssh:exec',
  CREATE_SHELL: 'ssh:createShell',
  SHELL_WRITE: 'ssh:shellWrite',
  SHELL_RESIZE: 'ssh:shellResize',
  FORWARD_LOCAL: 'ssh:forwardLocal',
  FORWARD_REMOTE: 'ssh:forwardRemote',
  FORWARD_DYNAMIC: 'ssh:forwardDynamic',
  SHELL_DATA: 'ssh:shellData',
} as const

export interface SSHIPCOptions {
  sshService: SSHService
  zmodemService: ZmodemService
  mainWindowGetter: () => Electron.BrowserWindow | null
}

export function registerSSHIPCHandlers(options: SSHIPCOptions): void {
  const { sshService, zmodemService, mainWindowGetter: _mainWindowGetter } = options

  // SSH connect
  ipcMain.handle(SSH_CHANNELS.CONNECT, async (_event: IpcMainInvokeEvent, config) => {
    try {
      const connection = await sshService.connect(config)
      return { success: true, connectionId: connection.id }
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error)
      return { success: false, error: message }
    }
  })

  // SSH disconnect
  ipcMain.handle(SSH_CHANNELS.DISCONNECT, async (_event: IpcMainInvokeEvent, connectionId: string) => {
    try {
      await sshService.disconnect(connectionId)
      return { success: true }
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error)
      return { success: false, error: message }
    }
  })

  // SSH exec command
  ipcMain.handle(SSH_CHANNELS.EXEC, async (_event: IpcMainInvokeEvent, connectionId: string, command: string) => {
    try {
      const result = await sshService.exec(connectionId, command)
      return { success: true, result }
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error)
      return { success: false, error: message }
    }
  })

  // SSH create shell
  ipcMain.handle(SSH_CHANNELS.CREATE_SHELL, async (event: IpcMainInvokeEvent, connectionId: string, options?: { cols?: number; rows?: number }, shellId?: string) => {
    debug('CREATE_SHELL connectionId:', connectionId, 'preferredId:', shellId)

    try {
      const preferredShellId = shellId
      logger.info('[SSH_IPC] Creating shell for connection:', connectionId, 'preferredId:', preferredShellId)
      debug('>>> Calling sshService.createShell...')

      const shell = await sshService.createShell(connectionId, options || {}, (shellId, data) => {
        // 检查 sender 是否已被销毁
        if (event.sender.isDestroyed()) {
          debug('SHELL DATA CALLBACK - SKIPPED (sender destroyed)')
          return
        }

        debug('SHELL DATA CALLBACK shellId:', shellId, 'data length:', data.length)

        try {
          debug('>>> Sending SHELL_DATA to renderer...')
          event.sender.send(SSH_CHANNELS.SHELL_DATA, connectionId, shellId, data)
          debug('>>> SHELL_DATA sent successfully')
        } catch (err) {
          logger.error('>>> FAILED to send SHELL_DATA:', err)
        }

        zmodemService.feedShellData(shellId, data)
      }, preferredShellId)

      logger.info('[SSH_IPC] Shell created:', shell.id)
      debug('>>> Shell created successfully:', shell.id)
      return { success: true, shellId: shell.id }
    } catch (error) {
      logger.error('[SSH_IPC] Shell creation failed:', error)
      const message = error instanceof Error ? error.message : String(error)
      debug('>>> Shell creation FAILED:', message)
      return { success: false, error: message }
    }
  })

  // SSH shell write
  ipcMain.handle(SSH_CHANNELS.SHELL_WRITE, async (_event: IpcMainInvokeEvent, shellId: string, data: string) => {
    try {
      sshService.shellWrite(shellId, data)
      return { success: true }
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error)
      return { success: false, error: message }
    }
  })

  // SSH shell resize
  ipcMain.handle(SSH_CHANNELS.SHELL_RESIZE, async (_event: IpcMainInvokeEvent, shellId: string, cols: number, rows: number) => {
    try {
      sshService.shellResize(shellId, cols, rows)
      return { success: true }
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error)
      return { success: false, error: message }
    }
  })

  // SSH local port forward
  ipcMain.handle(SSH_CHANNELS.FORWARD_LOCAL, async (
    _event: IpcMainInvokeEvent,
    connectionId: string,
    localPort: number,
    remoteHost: string,
    remotePort: number
  ) => {
    logHeader('FORWARD_LOCAL')
    logInfo('connectionId', connectionId)
    logInfo('localPort', localPort)
    logInfo('remoteHost', remoteHost)
    logInfo('remotePort', remotePort)

    try {
      const result = await sshService.forwardLocal(connectionId, localPort, remoteHost, remotePort)
      logSuccess(`Local forward bound to port ${result.boundPort}`)
      return { success: true, boundPort: result.boundPort }
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error)
      logError(`Local forward failed: ${message}`)
      return { success: false, error: message }
    }
  })

  // SSH remote port forward
  ipcMain.handle(SSH_CHANNELS.FORWARD_REMOTE, async (
    _event: IpcMainInvokeEvent,
    connectionId: string,
    remotePort: number,
    localHost: string,
    localPort: number
  ) => {
    logHeader('FORWARD_REMOTE')
    logInfo('connectionId', connectionId)
    logInfo('remotePort', remotePort)
    logInfo('localHost', localHost)
    logInfo('localPort', localPort)

    try {
      await sshService.forwardRemote(connectionId, remotePort, localHost, localPort)
      logSuccess('Remote forward established')
      return { success: true }
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error)
      logError(`Remote forward failed: ${message}`)
      return { success: false, error: message }
    }
  })

  // SSH dynamic port forward (SOCKS5)
  ipcMain.handle(SSH_CHANNELS.FORWARD_DYNAMIC, async (
    _event: IpcMainInvokeEvent,
    connectionId: string,
    localPort: number
  ) => {
    logHeader('FORWARD_DYNAMIC (SOCKS5)')
    logInfo('connectionId', connectionId)
    logInfo('localPort', localPort)

    try {
      const result = await sshService.forwardDynamic(connectionId, localPort)
      logSuccess(`SOCKS5 proxy started on port ${result.boundPort}`)
      return { success: true, boundPort: result.boundPort }
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error)
      logError(`Dynamic forward failed: ${message}`)
      return { success: false, error: message }
    }
  })
}