import { useState } from 'react'
import { Link, useNavigate, useParams } from 'react-router'
import { useDataProvider, useList, useOne } from '@refinedev/core'
import {
  Alert, Button, Card, CardContent, DetailList, Field, PageHeader, PageState, Select, StatusPill,
} from './lib/ui.jsx'
import { useTitle } from './lib/hooks.js'

const stateTone = { queued: 'neutral', executing: 'info', succeeded: 'success', failed: 'danger', needs_confirmation: 'warning', policy_hold: 'warning', cancelled: 'neutral' }
const stateText = { queued: '已排队', executing: '执行中', succeeded: '已成功', failed: '失败', needs_confirmation: '需要人工确认', policy_hold: '策略暂停', cancelled: '已取消' }
const holdText = {
  account_paused: '账号已暂停', account_revoked: '账号授权已撤销', binding_missing: '运行环境绑定缺失',
  environment_missing: '原运行环境不可用', exit_missing: '固定出口缺失', exit_unhealthy: '固定出口失败或发生漂移',
  runtime_stop_pending: '停止结果未知，等待人工核验', runtime_missing: '原运行实例不可用', runtime_lease_expired: '运行实例租约已过期',
  execution_lease_expired: '执行租约过期，结果未知', task_result_uncertain: '执行结果不确定', task_policy_hold: '执行器请求策略暂停',
  account_version_changed: '账号版本已变化', draft_version_changed: '草稿版本已变化', confirmation_missing: '确认快照缺失',
  confirmation_version_changed: '确认版本已变化', binding_version_changed: '环境或出口版本已变化', legacy_confirmation_required: '历史任务结果未知，等待人工核验',
}
const stateLabel = state => stateText[state] || `未知状态：${state}`
const holdLabel = reason => reason ? holdText[reason] || `未知停止原因：${reason}` : '无'

function actionErrorText(error) {
  const reason = error?.body?.reason_code
  if (error?.status === 409) return `当前版本仍不允许恢复（409）：${holdLabel(reason)}`
  if (error?.status === 503) return `原资源尚未恢复（503）：${holdLabel(reason)}`
  return error?.message || '操作失败'
}

function TaskCard({ task }) {
  return (
    <Card>
      <CardContent className="space-y-3">
        <div className="flex min-w-0 items-start justify-between gap-3">
          <Link to={`/tasks/${task.id}`} className="anywhere font-semibold text-primary hover:underline">{task.id}</Link>
          <StatusPill tone={stateTone[task.state] || 'neutral'} label={stateLabel(task.state)} />
        </div>
        <div className="text-sm"><span className="text-muted">账号：</span><Link to={`/accounts/${task.account_id}`} className="anywhere text-primary hover:underline">{task.account_id}</Link></div>
        <div className="text-sm"><span className="text-muted">确认：</span><span className="anywhere">{task.confirmation_id || '未确认'}</span></div>
        <div className="anywhere text-xs text-muted">{holdLabel(task.hold_reason)}</div>
        <p className="text-xs text-muted">{new Date(task.updated_at || task.created_at).toLocaleString('zh-CN')}</p>
      </CardContent>
    </Card>
  )
}

export function TaskList() {
  const [accountFilter, setAccountFilter] = useState('')
  const [stateFilter, setStateFilter] = useState('')
  const { result, query } = useList({
    resource: 'tasks',
    filters: [
      { field: 'account_id', value: accountFilter },
      { field: 'state', value: stateFilter },
    ],
  })
  const error = query.error
  const isPending = query.isPending
  const tasks = result.data ?? []
  useTitle('CreatorHub · 任务中心')

  return (
    <div>
      <PageHeader icon="ri-task-line" title="任务中心" description="逐条处理暂停、版本变化与未知执行结果；不会自动重试或更换出口" />
      <div className="mb-5 flex flex-col gap-3 sm:flex-row">
        <Field id="task-account-filter" label="按账号筛选" className="sm:w-72">
          <input id="task-account-filter" value={accountFilter} onChange={event => setAccountFilter(event.target.value)} placeholder="账号 ID" className="h-9 w-full rounded-md border border-[#c4ccd9] bg-white px-3 text-sm focus:border-primary focus:outline-none" />
        </Field>
        <Field id="task-state-filter" label="按状态筛选" className="sm:w-56">
          <Select id="task-state-filter" value={stateFilter} onChange={event => setStateFilter(event.target.value)}
            options={Object.entries(stateText).map(([value, label]) => ({ value, label }))} placeholder="全部状态" emptyOption={{ value: '', label: '全部状态' }} />
        </Field>
      </div>
      {error ? <Alert variant="destructive" className="mb-4">{error.message}</Alert> : null}
      <PageState pending={isPending} error={error} empty={tasks.length === 0} emptyText={accountFilter || stateFilter ? '没有符合筛选条件的任务' : '尚无任务'}>
        <div className="grid gap-4 md:grid-cols-2 xl:grid-cols-3">
          {tasks.map(task => <TaskCard key={task.id} task={task} />)}
        </div>
      </PageState>
    </div>
  )
}

export function TaskDetail() {
  const { id } = useParams()
  const navigate = useNavigate()
  const dataProvider = useDataProvider()('default')
  const [verification, setVerification] = useState('not_executed')
  const [busy, setBusy] = useState(false)
  const [notice, setNotice] = useState(null)
  const { result, error, isPending, query } = useOne({ resource: 'tasks', id, queryOptions: { retry: false } })
  const task = result
  useTitle('CreatorHub · 任务详情')

  if (isPending) return <PageState pending />
  if (error || !task) return <Alert variant="destructive">{error?.message || '任务不存在'}</Alert>

  async function runAction(action, data) {
    setBusy(true)
    setNotice(null)
    try {
      await dataProvider.taskAction(task.id, action, data)
      setNotice({ variant: 'success', text: action === 'verify' ? '人工核验已记录；现在只能按该结论恢复或结束。' : action === 'resume' ? '任务已恢复排队。' : '任务已按核验结论结束。' })
      await query.refetch()
    } catch (reason) {
      setNotice({ variant: 'destructive', text: actionErrorText(reason) })
    } finally {
      setBusy(false)
    }
  }

  const confirmation = task.confirmation || {}
  const unknownHold = task.hold_reason && !holdText[task.hold_reason]

  return (
    <div>
      <PageHeader title="任务详情" description={<span className="anywhere">{task.id}</span>}>
        <Button icon="ri-arrow-left-line" onClick={() => navigate('/tasks')}>返回任务中心</Button>
      </PageHeader>
      {notice ? <Alert variant={notice.variant} className="mb-4">{notice.text}</Alert> : null}
      {unknownHold ? <Alert variant="warning" className="mb-4">后端返回了未知停止原因“{task.hold_reason}”；为避免不安全操作，本页不提供恢复动作。</Alert> : null}
      <div className="grid gap-4 lg:grid-cols-2">
        <Card>
          <CardContent className="space-y-3">
            <h2 className="text-base font-semibold">当前状态</h2>
            <StatusPill tone={stateTone[task.state] || 'neutral'} label={stateLabel(task.state)} />
            <DetailList rows={[
              ['停止原因', <span className="anywhere">{holdLabel(task.hold_reason)}</span>],
              ['人工核验', task.verification_result || '尚未记录'],
            ]} />
            <div>
              <Button size="sm" as={Link} to={`/audit?task_id=${encodeURIComponent(task.id)}`}>查看关联审计</Button>
            </div>
          </CardContent>
        </Card>
        <Card>
          <CardContent className="space-y-3">
            <h2 className="text-base font-semibold">确认快照</h2>
            <DetailList rows={[
              ['确认', <span className="anywhere">{confirmation.id || '未记录'} · v{confirmation.version || '—'}</span>],
              ['版本', <>账号版本 {confirmation.account_version || '—'} · 草稿版本 {confirmation.draft_version || '—'}</>],
              ['环境与出口', <span className="anywhere">{confirmation.browser_env_alias || '未记录'} · {confirmation.network_exit_id || '未记录'} · 绑定版本：{confirmation.binding_version || '未记录'}</span>],
            ]} />
            <div className="flex flex-wrap gap-2">
              <Button size="sm" as={Link} to={`/accounts/${task.account_id}`}>查看账号</Button>
              <Button size="sm" as={Link} to={`/drafts/${task.draft_id}`}>查看草稿</Button>
            </div>
          </CardContent>
        </Card>
        <Card>
          <CardContent className="space-y-3">
            <h2 className="text-base font-semibold">执行关联</h2>
            <DetailList rows={[
              ['环境', <span className="anywhere">{task.browser_env_alias || '未记录'}</span>],
              ['固定出口', <span className="anywhere">{task.network_exit_id || '未记录'}</span>],
              ['运行实例 / 绑定版本', <span className="anywhere">{task.runtime_instance_id || '未记录'} · {task.binding_version || '未记录'}</span>],
            ]} />
            <div className="flex flex-wrap gap-2">
              {task.browser_env_alias ? <Button size="sm" as={Link} to={`/browsers/${encodeURIComponent(task.browser_env_alias)}`}>查看原环境</Button> : null}
              {task.network_exit_id ? <Button size="sm" as={Link} to={`/network-exits/${encodeURIComponent(task.network_exit_id)}`}>查看原出口</Button> : null}
            </div>
          </CardContent>
        </Card>
        <Card>
          <CardContent className="space-y-3">
            <h2 className="text-base font-semibold">唯一安全动作</h2>
            {task.readiness_reason ? <Alert variant="warning">当前仍被阻断：{holdLabel(task.readiness_reason)}。修复原资源并刷新后，才会开放恢复。</Alert> : null}
            {task.allowed_action === 'verify' ? (
              <>
                <Alert variant="warning">先在原环境和原出口核验真实结果。选择“未执行”不会立即重试，仍需下一步显式恢复。</Alert>
                <Field id="task-verification" label="人工核验结论">
                  <Select id="task-verification" value={verification} onChange={event => setVerification(event.target.value)} options={[
                    { value: 'not_executed', label: '确认未执行，可评估恢复' },
                    { value: 'succeeded', label: '确认已成功' },
                    { value: 'failed', label: '确认已失败' },
                  ]} />
                </Field>
                <Button variant="primary" disabled={busy} onClick={() => runAction('verify', { result: verification })}>记录人工核验</Button>
              </>
            ) : null}
            {task.allowed_action === 'resume' ? <Button variant="primary" disabled={busy} onClick={() => runAction('resume')}>按核验结论恢复排队</Button> : null}
            {task.allowed_action === 'finish' ? <Button variant="primary" disabled={busy} onClick={() => runAction('finish')}>按核验结论结束任务</Button> : null}
            {task.allowed_action === 'reconfirm' ? (
              <>
                <Alert variant="warning">版本已变化，旧确认不可继续使用。</Alert>
                <Button variant="primary" as={Link} to={`/drafts/${task.draft_id}`}>重新核对并确认草稿</Button>
              </>
            ) : null}
            {task.allowed_action ? null : <p className="text-sm text-muted">当前没有可安全执行的动作。</p>}
          </CardContent>
        </Card>
      </div>
      <section className="mt-6">
        <h2 className="mb-3 text-lg font-bold">执行尝试</h2>
        {task.attempts?.length ? (
          <div className="grid gap-4 md:grid-cols-2">
            {task.attempts.map(attempt => (
              <Card key={attempt.id}>
                <CardContent>
                  <Link to={`/attempts/${encodeURIComponent(attempt.id)}`} className="anywhere font-semibold text-primary hover:underline">{attempt.id}</Link>
                  <p className="mt-1.5 text-sm">{attempt.outcome || '执行中'} · {new Date(attempt.started_at).toLocaleString('zh-CN')}</p>
                  <p className="anywhere mt-1 text-sm">脱敏证据：{attempt.evidence?.mock_outcome || '无可公开证据'}</p>
                </CardContent>
              </Card>
            ))}
          </div>
        ) : (
          <Card><CardContent><p className="text-sm text-muted">尚未产生执行尝试。</p></CardContent></Card>
        )}
      </section>
    </div>
  )
}