import { useCallback, useEffect, useRef, useState } from 'react'
import {
  Button, Card, Form, Input, Label, ListBox, Modal, Select, Spinner, Switch, TextField, toast, useOverlayState,
} from '@heroui/react'
import {
  hubSettings, hubChangePassword, hubBotAction, hubBotConfig, hubBotConfigSave,
} from '../../api/client'
import { watchBotReconnect } from '../../lib/botAction'

interface SettingsData {
  ok: boolean
  version: string
}
interface BotConfigData {
  ok: boolean
  superusers: string[]
  nickname: string[]
  debug: boolean
  log_level: string
  log_level_options: string[]
  log_max_mb: number
  log_max_mb_default: number
  source: string
  notice?: string
  applied?: string[]
  restart_required?: boolean
}

const LOG_LEVELS = ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL']
const selectCls = 'min-w-[150px] bg-white border border-slate-200 rounded-lg px-3 py-2 text-sm text-slate-800 focus:border-indigo-400 focus:outline-none'

export default function SettingsPage() {
  const [data, setData] = useState<SettingsData | null>(null)
  const [error, setError] = useState('')
  const [oldPassword, setOldPassword] = useState('')
  const [newPassword, setNewPassword] = useState('')
  const [confirm, setConfirm] = useState('')
  const [busy, setBusy] = useState(false)
  const [botBusy, setBotBusy] = useState(false)
  const [pendingAction, setPendingAction] = useState<'stop' | 'restart' | null>(null)
  const [restarting, setRestarting] = useState<null | 'stop' | 'restart'>(null)
  const botState = useOverlayState()
  const restartDisposeRef = useRef<(() => void) | null>(null)

  const [botCfg, setBotCfg] = useState<BotConfigData | null>(null)
  const [cfgSuperusers, setCfgSuperusers] = useState('')
  const [cfgNickname, setCfgNickname] = useState('')
  const [cfgDebug, setCfgDebug] = useState(false)
  const [cfgLogLevel, setCfgLogLevel] = useState('INFO')
  const [cfgLogMaxMb, setCfgLogMaxMb] = useState('20')
  const [cfgBusy, setCfgBusy] = useState(false)
  const [cfgLoaded, setCfgLoaded] = useState(false)

  const load = useCallback(async () => {
    try {
      const s = await hubSettings()
      setData(s)
      setError('')
    } catch (e: any) {
      setError(e.message || '加载失败')
    }
    try {
      const c = await hubBotConfig()
      setBotCfg(c)
      setCfgSuperusers((c.superusers || []).join(', '))
      setCfgNickname((c.nickname || []).join(', '))
      setCfgDebug(!!c.debug)
      setCfgLogLevel(c.log_level || 'INFO')
      setCfgLogMaxMb(String(c.log_max_mb ?? c.log_max_mb_default ?? 20))
      setCfgLoaded(true)
    } catch (e: any) {
      setCfgLoaded(false)
      console.warn('读取 bot 配置失败', e)
    }
  }, [])

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

  // dispose 内部会一并撤掉 SSE 与超时定时器
  useEffect(() => () => { restartDisposeRef.current?.() }, [])

  const changePassword = async () => {
    if (!oldPassword) { toast.warning('请输入原密码'); return }
    if (newPassword.length < 6) { toast.warning('新密码长度不能少于 6 位'); return }
    if (newPassword !== confirm) { toast.warning('两次输入的新密码不一致'); return }
    setBusy(true)
    try {
      await hubChangePassword(oldPassword, newPassword)
      toast.success('密码已修改')
      setOldPassword(''); setNewPassword(''); setConfirm('')
    } catch (e: any) {
      toast.danger(e.message || '修改失败')
    } finally { setBusy(false) }
  }

  const saveBotConfig = async () => {
    setCfgBusy(true)
    try {
      const values: Record<string, any> = {
        superusers: (cfgSuperusers || '').split(/[,\s]+/).map(s => s.trim()).filter(Boolean),
        nickname: (cfgNickname || '').split(/[,\s]+/).map(s => s.trim()).filter(Boolean),
        debug: cfgDebug,
        log_level: cfgLogLevel,
      }
      const logMaxMbRaw = cfgLogMaxMb.trim()
      if (logMaxMbRaw !== '') {
        const logMaxMb = parseInt(logMaxMbRaw, 10)
        if (!(logMaxMb > 0)) { toast.warning('日志清理大小需为正整数（MB）'); setCfgBusy(false); return }
        values.log_max_mb = logMaxMb
      }
      const r = await hubBotConfigSave(values)
      setBotCfg(r)
      setCfgSuperusers((r.superusers || []).join(', '))
      setCfgNickname((r.nickname || []).join(', '))
      setCfgDebug(!!r.debug)
      setCfgLogLevel(r.log_level || 'INFO')
      setCfgLogMaxMb(String(r.log_max_mb ?? r.log_max_mb_default ?? 20))
      toast.success('BOT 配置已保存')
      if (r.notice) toast.info(r.notice)
    } catch (e: any) {
      toast.danger(e.message || '保存失败')
    } finally { setCfgBusy(false) }
  }

  const askBotAction = (action: 'stop' | 'restart') => {
    setPendingAction(action)
    botState.open()
  }

  const pollForReconnect = () => {
    // 等待逻辑与顶栏账号菜单共用一份（lib/botAction.ts），别在两边各写一套
    restartDisposeRef.current?.()
    restartDisposeRef.current = watchBotReconnect({
      onReady: () => {
        restartDisposeRef.current = null
        setRestarting(null)
        toast.success('bot 已重启并回连')
        load()
      },
      onTimeout: () => {
        restartDisposeRef.current = null
        setRestarting(null)
        toast.danger('等待回连超时，请检查 bot 是否已启动')
      },
    })
  }

  const confirmBotAction = async () => {
    if (!pendingAction) return
    const action = pendingAction
    setBotBusy(true)
    try {
      const r = await hubBotAction(action)
      toast.success((r as any)?.msg || `已请求${action === 'stop' ? '停止' : '重启'} bot`)
      botState.close()
      setPendingAction(null)
      setRestarting(action)
      if (action === 'restart') pollForReconnect()
    } catch (e: any) {
      toast.danger(e.message || '操作失败')
    } finally { setBotBusy(false) }
  }

  return (
    <div className="space-y-6">
      <h2 className="text-xl font-semibold text-slate-800">设置</h2>
      <div className="grid gap-6 lg:grid-cols-2">
        <Card className="border border-slate-200 bg-white lg:col-span-2">
          <Card.Header><Card.Title>修改密码</Card.Title></Card.Header>
          <Card.Content>
            <Form className="space-y-4">
              <TextField><Label>原密码</Label><Input type="password" value={oldPassword} onChange={e => setOldPassword(e.target.value)} /></TextField>
              <TextField><Label>新密码</Label><Input type="password" value={newPassword} onChange={e => setNewPassword(e.target.value)} placeholder="至少 6 位" /></TextField>
              <TextField><Label>确认新密码</Label><Input type="password" value={confirm} onChange={e => setConfirm(e.target.value)} /></TextField>
              <Button isDisabled={busy || !!restarting} onPress={changePassword}>{busy ? '修改中…' : '保存修改'}</Button>
            </Form>
            <p className="text-xs text-slate-400 mt-3">修改后旧登录态失效，当前会话保持在线。</p>
          </Card.Content>
        </Card>

        {/* BOT 全局配置 */}
        <Card className="border border-slate-200 bg-white lg:col-span-2">
          <Card.Header><Card.Title>BOT 配置</Card.Title></Card.Header>
          <Card.Content>
            <p className="text-xs text-slate-400 mb-4">
              SUPERUSERS / NICKNAME 支持逗号或空格分隔；保存后会写入 .env 并尽量热应用。
              部分插件在启动时缓存了这些值，完全生效建议保存后重启 bot。
              日志清理大小保存后仅在下一个检查周期(约 1 分钟)内生效，无需重启。
            </p>
            <div className="grid gap-4 md:grid-cols-2">
              <TextField>
                <Label>SUPERUSERS</Label>
                <Input value={cfgSuperusers} onChange={e => setCfgSuperusers(e.target.value)} placeholder="如: 123456789, 987654321" />
                <span className="text-xs text-slate-400">超级用户 QQ 号（逗号/空格分隔）</span>
              </TextField>
              <TextField>
                <Label>NICKNAME</Label>
                <Input value={cfgNickname} onChange={e => setCfgNickname(e.target.value)} placeholder="如: 爱丽丝" />
                <span className="text-xs text-slate-400">机器人昵称（逗号/空格分隔）</span>
              </TextField>
              <div className="flex items-center justify-between rounded-xl border border-slate-200 px-4 py-3">
                <div>
                  <div className="text-sm font-medium text-slate-700">DEBUG</div>
                  <div className="text-xs text-slate-400">开启调试模式</div>
                </div>
                <Switch isSelected={cfgDebug} onChange={(v) => setCfgDebug(v)}>
                  <Switch.Content><Switch.Control><Switch.Thumb /></Switch.Control>{cfgDebug ? '开' : '关'}</Switch.Content>
                </Switch>
              </div>
              <div>
                <Label>LOG_LEVEL</Label>
                <Select selectedKey={cfgLogLevel} onSelectionChange={(k) => setCfgLogLevel(String(k))}>
                  <Select.Trigger className={selectCls}><Select.Value /></Select.Trigger>
                  <Select.Popover><ListBox>
                    {(botCfg?.log_level_options || LOG_LEVELS).map(o => <ListBox.Item key={o} id={o}>{o}</ListBox.Item>)}
                  </ListBox></Select.Popover>
                </Select>
                <span className="text-xs text-slate-400">日志等级（INFO 为默认）</span>
              </div>
              <TextField>
                <Label>日志清理大小 (MB)</Label>
                <Input type="number" min={1} value={cfgLogMaxMb} onChange={e => setCfgLogMaxMb(e.target.value)} placeholder="如: 20" />
                <span className="text-xs text-slate-400">_bot_run.log 超过该大小即清空（不归档）</span>
              </TextField>
            </div>
            <div className="mt-4 flex items-center gap-3">
              <Button isDisabled={cfgBusy || !cfgLoaded || !!restarting} onPress={saveBotConfig}>{cfgBusy ? '保存中…' : '保存 BOT 配置'}</Button>
              {!cfgLoaded && <span className="text-xs text-slate-400">配置未加载</span>}
              {botCfg?.source === 'env' && <span className="text-xs text-slate-400">当前来源：.env</span>}
            </div>
          </Card.Content>
        </Card>

        <Card className="border border-slate-200 bg-white lg:col-span-2">
          <Card.Header><Card.Title>进程控制</Card.Title></Card.Header>
          <Card.Content className="space-y-3">
            <p className="text-sm text-slate-500">停止 / 重启当前 bot 进程。停止会断开 Web 与 QQ 连接；重启会先拉起新进程再退出旧进程，日志继续写入 _bot_run.log。重启过程中界面会禁用操作并等待回连。</p>
            <div className="flex flex-wrap items-center gap-3">
              <Button variant="tertiary" className="text-red-500" isDisabled={botBusy || !!restarting} onPress={() => askBotAction('stop')}>停止 bot</Button>
              <Button isDisabled={botBusy || !!restarting} onPress={() => askBotAction('restart')}>重启 bot</Button>
            </div>
          </Card.Content>
        </Card>

        <Card className="border border-slate-200 bg-white lg:col-span-2">
          <Card.Header><Card.Title>关于</Card.Title></Card.Header>
          <Card.Content>
            <p className="text-sm text-slate-500">HeXi 管理系统 v{data?.version || '—'} · 统一 Web 管理台</p>
          </Card.Content>
        </Card>
      </div>

      <Modal isOpen={botState.isOpen} onOpenChange={botState.setOpen}>
        <Modal.Backdrop><Modal.Container><Modal.Dialog>
          <Modal.Header><Modal.Heading>{pendingAction === 'stop' ? '停止 bot' : '重启 bot'}</Modal.Heading></Modal.Header>
          <Modal.Body><p className="text-sm text-slate-600">
            {pendingAction === 'stop' ? '确定停止当前 bot 进程吗？Web 管理台与 QQ 连接将断开。' : '确定重启 bot 进程吗？将先拉起新进程再退出旧进程。'}
          </p></Modal.Body>
          <Modal.Footer>
            <Button variant="tertiary" onPress={botState.close}>取消</Button>
            <Button isDisabled={botBusy} onPress={confirmBotAction}>{botBusy ? '执行中…' : '确定'}</Button>
          </Modal.Footer>
        </Modal.Dialog></Modal.Container></Modal.Backdrop>
      </Modal>

      {restarting === 'stop' && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-slate-900/60 p-4">
          <Card className="border border-slate-200 bg-white"><Card.Content className="space-y-3 text-center">
            <div className="text-sm font-medium text-slate-800">正在停止 bot…</div>
            <p className="text-xs text-slate-400">Web 与 QQ 连接已断开，请在服务器重新启动 bot。</p>
            <Button size="sm" variant="tertiary" onPress={() => setRestarting(null)}>知道了</Button>
          </Card.Content></Card>
        </div>
      )}
      {restarting === 'restart' && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-slate-900/60 p-4">
          <Card className="border border-slate-200 bg-white"><Card.Content className="space-y-3 text-center">
            <div className="text-sm font-medium text-slate-800">正在重启 bot，等待回连…</div>
            <p className="text-xs text-slate-400">期间已禁用所有操作，恢复后自动继续。</p>
            <div className="flex justify-center"><Spinner /></div>
          </Card.Content></Card>
        </div>
      )}
    </div>
  )
}