import { useEffect, useState } from 'react'
import { Plus, Play, Square, Trash2, ArrowRightLeft, ArrowLeftRight, Shuffle } from 'lucide-react'
import { api, type Tunnel, type Integration } from '../lib/api'

const TEXT_PRIMARY = '#E8E6E0'
const TEXT_SECONDARY = '#7A7D85'
const GOLD = '#C8A434'

const cardBase: React.CSSProperties = {
  backgroundColor: 'rgba(10, 10, 12, 0.92)',
  border: '1px solid rgba(200, 164, 52, 0.08)',
  borderRadius: '12px',
  padding: '20px',
  boxShadow: '0 0 20px rgba(200, 164, 52, 0.03)',
}

const MODE_LABEL: Record<Tunnel['mode'], string> = {
  local: 'Local Forward',
  remote: 'Remote Forward',
  dynamic: 'Dynamic (SOCKS5)',
}

const MODE_ICON: Record<Tunnel['mode'], React.ComponentType<{ size?: number; color?: string }>> = {
  local: ArrowRightLeft,
  remote: ArrowLeftRight,
  dynamic: Shuffle,
}

const STATUS_COLOR: Record<Tunnel['status'], string> = {
  stopped: TEXT_SECONDARY,
  connecting: GOLD,
  retrying: '#E0A030',
  connected: '#2ECC71',
  error: '#E74C3C',
}

function inputStyle(): React.CSSProperties {
  return {
    backgroundColor: 'rgba(255,255,255,0.03)',
    border: '1px solid rgba(255,255,255,0.08)',
    borderRadius: '6px',
    padding: '6px 10px',
    color: TEXT_PRIMARY,
    fontSize: '13px',
    width: '100%',
  }
}

export default function Tunnels() {
  const [tunnels, setTunnels] = useState<Tunnel[]>([])
  const [hosts, setHosts] = useState<Integration[]>([])
  const [showForm, setShowForm] = useState(false)
  const [busyId, setBusyId] = useState<number | null>(null)
  const [error, setError] = useState<string | null>(null)

  const [name, setName] = useState('')
  const [integrationId, setIntegrationId] = useState<number | ''>('')
  const [mode, setMode] = useState<Tunnel['mode']>('local')
  const [sourcePort, setSourcePort] = useState('')
  const [endpointHost, setEndpointHost] = useState('')
  const [endpointPort, setEndpointPort] = useState('')
  const [autoStart, setAutoStart] = useState(false)

  function refresh() {
    api.listTunnels().then(({ tunnels }) => setTunnels(tunnels))
  }

  useEffect(() => {
    refresh()
    api.listIntegrations().then(({ integrations }) => setHosts(integrations.filter((i) => i.type === 'ssh')))
    const interval = setInterval(refresh, 3000)
    return () => clearInterval(interval)
  }, [])

  async function handleCreate() {
    if (!name.trim() || !integrationId || !sourcePort) {
      setError('Name, SSH host, and source port are required')
      return
    }
    setError(null)
    try {
      await api.createTunnel({
        name: name.trim(),
        integrationId: Number(integrationId),
        mode,
        sourcePort: Number(sourcePort),
        endpointHost: mode === 'dynamic' ? '' : endpointHost,
        endpointPort: mode === 'dynamic' ? 0 : Number(endpointPort) || 0,
        autoStart,
      })
      setName('')
      setIntegrationId('')
      setSourcePort('')
      setEndpointHost('')
      setEndpointPort('')
      setAutoStart(false)
      setShowForm(false)
      refresh()
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to create tunnel')
    }
  }

  async function handleConnect(id: number) {
    setBusyId(id)
    try {
      await api.connectTunnel(id)
      refresh()
    } finally {
      setBusyId(null)
    }
  }

  async function handleDisconnect(id: number) {
    setBusyId(id)
    try {
      await api.disconnectTunnel(id)
      refresh()
    } finally {
      setBusyId(null)
    }
  }

  async function handleDelete(id: number) {
    setBusyId(id)
    try {
      await api.deleteTunnel(id)
      refresh()
    } finally {
      setBusyId(null)
    }
  }

  return (
    <div className="p-6 space-y-6">
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-xl font-semibold" style={{ color: TEXT_PRIMARY }}>
            SSH Tunnels
          </h1>
          <p className="text-sm" style={{ color: TEXT_SECONDARY }}>
            Local / remote / dynamic SOCKS5 port forwarding through your configured SSH hosts.
          </p>
        </div>
        <button
          onClick={() => setShowForm((s) => !s)}
          className="flex items-center gap-1.5 rounded-md px-3 py-2 text-sm font-medium"
          style={{ backgroundColor: GOLD, color: '#0A0A0C' }}
        >
          <Plus size={16} />
          New Tunnel
        </button>
      </div>

      {showForm && (
        <div style={cardBase} className="space-y-3">
          {error && <div style={{ color: '#E74C3C', fontSize: '13px' }}>{error}</div>}
          <div className="grid grid-cols-2 gap-3">
            <div>
              <label style={{ color: TEXT_SECONDARY, fontSize: '11px' }}>Name</label>
              <input style={inputStyle()} value={name} onChange={(e) => setName(e.target.value)} placeholder="my-tunnel" />
            </div>
            <div>
              <label style={{ color: TEXT_SECONDARY, fontSize: '11px' }}>SSH Host</label>
              <select
                style={inputStyle()}
                value={integrationId}
                onChange={(e) => setIntegrationId(e.target.value ? Number(e.target.value) : '')}
              >
                <option value="">Select host…</option>
                {hosts.map((h) => (
                  <option key={h.id} value={h.id}>
                    {h.name}
                  </option>
                ))}
              </select>
            </div>
            <div>
              <label style={{ color: TEXT_SECONDARY, fontSize: '11px' }}>Mode</label>
              <select style={inputStyle()} value={mode} onChange={(e) => setMode(e.target.value as Tunnel['mode'])}>
                <option value="local">Local Forward</option>
                <option value="remote">Remote Forward</option>
                <option value="dynamic">Dynamic (SOCKS5)</option>
              </select>
            </div>
            <div>
              <label style={{ color: TEXT_SECONDARY, fontSize: '11px' }}>
                {mode === 'dynamic' ? 'SOCKS5 Listen Port' : 'Source Port'}
              </label>
              <input style={inputStyle()} value={sourcePort} onChange={(e) => setSourcePort(e.target.value)} placeholder="8080" />
            </div>
            {mode !== 'dynamic' && (
              <>
                <div>
                  <label style={{ color: TEXT_SECONDARY, fontSize: '11px' }}>Endpoint Host</label>
                  <input style={inputStyle()} value={endpointHost} onChange={(e) => setEndpointHost(e.target.value)} placeholder="127.0.0.1" />
                </div>
                <div>
                  <label style={{ color: TEXT_SECONDARY, fontSize: '11px' }}>Endpoint Port</label>
                  <input style={inputStyle()} value={endpointPort} onChange={(e) => setEndpointPort(e.target.value)} placeholder="80" />
                </div>
              </>
            )}
          </div>
          <label className="flex items-center gap-2 text-xs" style={{ color: TEXT_PRIMARY }}>
            <input type="checkbox" checked={autoStart} onChange={(e) => setAutoStart(e.target.checked)} />
            Auto-start when the server boots
          </label>
          <div className="flex gap-2">
            <button onClick={handleCreate} className="rounded-md px-3 py-1.5 text-sm font-medium" style={{ backgroundColor: GOLD, color: '#0A0A0C' }}>
              Create
            </button>
            <button onClick={() => setShowForm(false)} className="rounded-md px-3 py-1.5 text-sm" style={{ color: TEXT_SECONDARY }}>
              Cancel
            </button>
          </div>
        </div>
      )}

      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
        {tunnels.map((t) => {
          const Icon = MODE_ICON[t.mode]
          const host = hosts.find((h) => h.id === t.integrationId)
          return (
            <div key={t.id} style={cardBase} className="space-y-3">
              <div className="flex items-center justify-between">
                <div className="flex items-center gap-2">
                  <Icon size={16} color={GOLD} />
                  <span className="font-medium" style={{ color: TEXT_PRIMARY }}>
                    {t.name}
                  </span>
                </div>
                <span
                  className="text-xs rounded-full px-2 py-0.5"
                  style={{ color: STATUS_COLOR[t.status], border: `1px solid ${STATUS_COLOR[t.status]}33` }}
                >
                  {t.status}
                  {t.status === 'retrying' ? ` (${t.retryCount}/${t.maxRetries})` : ''}
                </span>
              </div>
              <div style={{ color: TEXT_SECONDARY, fontSize: '12px' }} className="space-y-1">
                <div>{MODE_LABEL[t.mode]}</div>
                <div>via {host?.name ?? `integration #${t.integrationId}`}</div>
                <div>
                  localhost:{t.sourcePort} {t.mode === 'dynamic' ? '(SOCKS5 proxy)' : `→ ${t.endpointHost}:${t.endpointPort}`}
                </div>
                {t.error && <div style={{ color: '#E74C3C' }}>{t.error}</div>}
              </div>
              <div className="flex gap-2">
                {t.status === 'connected' || t.status === 'connecting' || t.status === 'retrying' ? (
                  <button
                    disabled={busyId === t.id}
                    onClick={() => handleDisconnect(t.id)}
                    className="flex items-center gap-1 rounded-md px-2.5 py-1 text-xs"
                    style={{ border: '1px solid rgba(255,255,255,0.1)', color: TEXT_PRIMARY }}
                  >
                    <Square size={12} /> Stop
                  </button>
                ) : (
                  <button
                    disabled={busyId === t.id}
                    onClick={() => handleConnect(t.id)}
                    className="flex items-center gap-1 rounded-md px-2.5 py-1 text-xs"
                    style={{ backgroundColor: GOLD, color: '#0A0A0C' }}
                  >
                    <Play size={12} /> Start
                  </button>
                )}
                <button
                  disabled={busyId === t.id}
                  onClick={() => handleDelete(t.id)}
                  className="flex items-center gap-1 rounded-md px-2.5 py-1 text-xs"
                  style={{ border: '1px solid rgba(231,76,60,0.3)', color: '#E74C3C' }}
                >
                  <Trash2 size={12} /> Delete
                </button>
              </div>
            </div>
          )
        })}
        {tunnels.length === 0 && !showForm && (
          <div style={{ color: TEXT_SECONDARY, fontSize: '13px' }}>No tunnels configured yet.</div>
        )}
      </div>
    </div>
  )
}