/**
 * 快速连接 — 尽量像 ssh 命令一样简单
 * 支持：host | user@host | user@host:port | host:port
 */

import { useEffect, useState } from 'react'
import { Zap, ArrowRight, AlertCircle } from 'lucide-react'
import { useTabStore } from '../../stores/tabStore'
import Modal from '../common/Modal'
import Button from '../common/Button'

interface QuickConnectDialogProps {
  isOpen: boolean
  onClose: () => void
  initialTarget?: string
}

/** 解析 user@host:port / host:port / host */
// eslint-disable-next-line react-refresh/only-export-components
export function parseSshTarget(raw: string): {
  host: string
  port: number
  username: string
} | null {
  const s = raw.trim()
  if (!s) return null

  // strip optional ssh://
  const cleaned = s.replace(/^ssh:\/\//i, '')

  let username = 'root'
  let hostPort = cleaned

  const at = cleaned.lastIndexOf('@')
  if (at > 0) {
    username = cleaned.slice(0, at).trim() || 'root'
    hostPort = cleaned.slice(at + 1).trim()
  }

  // IPv6 in brackets [2001:db8::1]:22
  let host = hostPort
  let port = 22
  const bracket = /^\[([^\]]+)\](?::(\d+))?$/.exec(hostPort)
  if (bracket) {
    host = bracket[1]
    if (bracket[2]) port = parseInt(bracket[2], 10) || 22
  } else {
    // last :port — avoid splitting bare IPv6 without brackets
    const colon = hostPort.lastIndexOf(':')
    if (colon > 0 && hostPort.indexOf(':') === colon) {
      const maybePort = hostPort.slice(colon + 1)
      if (/^\d+$/.test(maybePort)) {
        host = hostPort.slice(0, colon)
        port = parseInt(maybePort, 10) || 22
      }
    }
  }

  host = host.trim()
  if (!host || !username) return null
  return { host, port, username }
}

export default function QuickConnectDialog({ isOpen, onClose, initialTarget = '' }: QuickConnectDialogProps) {
  const { addTab } = useTabStore()
  const [target, setTarget] = useState('')
  const [password, setPassword] = useState('')
  const [isConnecting, setIsConnecting] = useState(false)
  const [error, setError] = useState<string | null>(null)

  useEffect(() => {
    if (!isOpen) return
    setTarget(initialTarget)
    setPassword('')
    setError(null)
    setIsConnecting(false)
  }, [initialTarget, isOpen])

  const handleSubmit = async () => {
    const parsed = parseSshTarget(target)
    if (!parsed) {
      setError('请输入主机，例如 root@192.168.1.10 或 opsbase.cn:5555')
      return
    }
    setIsConnecting(true)
    setError(null)

    try {
      addTab({
        title: `${parsed.username}@${parsed.host}`,
        type: 'terminal',
        connectionConfig: {
          host: parsed.host,
          port: parsed.port,
          username: parsed.username,
          password: password || undefined,
        },
      })

      onClose()
      setTarget('')
      setPassword('')
    } catch (err: unknown) {
      setError((err instanceof Error ? err.message : String(err)) || '连接失败')
    } finally {
      setIsConnecting(false)
    }
  }

  return (
    <Modal
      isOpen={isOpen}
      onClose={onClose}
      title="快速连接"
      icon={<Zap className="h-5 w-5" />}
      size="md"
      showFooter={false}
    >
      <form
        onSubmit={(e) => {
          e.preventDefault()
          void handleSubmit()
        }}
        className="space-y-4"
      >
        <div>
          <label className="ui-label">目标</label>
          <input
            type="text"
            required
            autoFocus
            value={target}
            onChange={(e) => setTarget(e.target.value)}
            placeholder="root@192.168.1.10:22"
            className="ui-input font-mono"
            autoComplete="off"
            spellCheck={false}
          />
          <p className="mt-1.5 text-[11px] leading-relaxed text-txt-faint">支持 host、user@host、user@host:port</p>
        </div>

        <div>
          <label className="ui-label">
            密码 <span className="font-normal text-txt-faint">可选 · 用密钥可留空</span>
          </label>
          <input
            type="password"
            value={password}
            onChange={(e) => setPassword(e.target.value)}
            placeholder="••••••••"
            className="ui-input"
            autoComplete="current-password"
          />
        </div>

        {error && (
          <div className="flex items-start gap-2 rounded-lg border border-red-500/30 bg-red-500/10 px-3 py-2.5 text-sm text-red-300">
            <AlertCircle className="mt-0.5 h-4 w-4 flex-shrink-0" />
            <span>{error}</span>
          </div>
        )}

        <div className="border-dark-700/50 flex justify-end gap-2.5 border-t pt-2">
          <Button type="button" variant="ghost" size="sm" onClick={onClose} disabled={isConnecting}>
            取消
          </Button>
          <Button
            type="submit"
            variant="primary"
            size="sm"
            loading={isConnecting}
            icon={<ArrowRight className="h-3.5 w-3.5" />}
          >
            连接
          </Button>
        </div>
      </form>
    </Modal>
  )
}