import { useEffect, useState } from 'react'
import { Link, useSearchParams } from 'react-router'
import { useList } from '@refinedev/core'
import { Alert, Button, PageHeader, PageState, Table } from './lib/ui.jsx'
import { useTitle } from './lib/hooks.js'

const startOfDay = value => (value ? new Date(`${value}T00:00:00`).toISOString() : '')
const endOfDay = value => (value ? new Date(`${value}T23:59:59.999`).toISOString() : '')

const csvColumns = ['id', 'event_type', 'account_id', 'task_id', 'attempt_id', 'browser_env_alias', 'network_exit_id', 'binding_version', 'reason_code', 'outcome', 'created_at']
const csvCell = value => `"${String(value ?? '').replaceAll('"', '""')}"`

// 导出仅含关联字段的脱敏白名单，不带 details。
export function auditCSV(events) {
  return [csvColumns, ...events.map(event => csvColumns.map(column => event[column]))]
    .map(row => row.map(csvCell).join(','))
    .join('\n')
}

function downloadCSV(events) {
  const url = URL.createObjectURL(new Blob([auditCSV(events)], { type: 'text/csv;charset=utf-8' }))
  const anchor = document.createElement('a')
  anchor.href = url
  anchor.download = 'creatorhub-audit.csv'
  anchor.click()
  URL.revokeObjectURL(url)
}

const filterInput = 'h-9 w-full rounded-md border border-[#c4ccd9] bg-white px-3 text-sm focus:border-primary focus:outline-none'

function FilterField({ id, label, ...props }) {
  return (
    <div className="min-w-0 space-y-1">
      <label htmlFor={id} className="block text-sm font-medium text-ink">{label}</label>
      <input id={id} {...props} className={filterInput} />
    </div>
  )
}

export function AuditPage() {
  const [searchParams] = useSearchParams()
  const [account, setAccount] = useState(searchParams.get('account_id') || '')
  const [task, setTask] = useState(searchParams.get('task_id') || '')
  const [attempt, setAttempt] = useState(searchParams.get('attempt_id') || '')
  const [env, setEnv] = useState(searchParams.get('browser_env_alias') || '')
  const [exit, setExit] = useState(searchParams.get('network_exit_id') || '')
  const [eventType, setEventType] = useState('')
  const [from, setFrom] = useState('')
  const [to, setTo] = useState('')
  const [page, setPage] = useState(1)
  const filters = [
    { field: 'account_id', value: account },
    { field: 'task_id', value: task },
    { field: 'attempt_id', value: attempt },
    { field: 'browser_env_alias', value: env },
    { field: 'network_exit_id', value: exit },
    { field: 'event_type', value: eventType },
    { field: 'from', value: startOfDay(from) },
    { field: 'to', value: endOfDay(to) },
  ]
  const { result, query } = useList({ resource: 'audit', pagination: { currentPage: page, pageSize: 25 }, filters, queryOptions: { retry: false } })
  const error = query.error
  const isPending = query.isPending
  const events = result.data ?? []
  const total = result.total ?? 0
  useTitle('CreatorHub · 审计记录')
  useEffect(() => { setPage(1) }, [account, task, attempt, env, exit, eventType, from, to])
  const hasFilters = !!(account || task || attempt || env || exit || eventType || from || to)

  return (
    <div>
      <PageHeader icon="ri-history-line" title="审计记录" description="追加式事件回溯；页面不提供编辑或删除">
        <Button icon="ri-download-2-line" disabled={!events.length} onClick={() => downloadCSV(events)}>导出当前页（脱敏）</Button>
      </PageHeader>
      <div className="mb-5 grid gap-4 sm:grid-cols-2 lg:grid-cols-4">
        <FilterField id="audit-account" label="账号" value={account} onChange={event => setAccount(event.target.value)} />
        <FilterField id="audit-task" label="任务" value={task} onChange={event => setTask(event.target.value)} />
        <FilterField id="audit-attempt" label="Attempt" value={attempt} onChange={event => setAttempt(event.target.value)} />
        <FilterField id="audit-env" label="环境" value={env} onChange={event => setEnv(event.target.value)} />
        <FilterField id="audit-exit" label="出口" value={exit} onChange={event => setExit(event.target.value)} />
        <FilterField id="audit-event" label="事件" value={eventType} onChange={event => setEventType(event.target.value)} />
        <FilterField id="audit-from" label="开始日期" type="date" value={from} onChange={event => setFrom(event.target.value)} />
        <FilterField id="audit-to" label="结束日期" type="date" value={to} onChange={event => setTo(event.target.value)} />
      </div>
      {hasFilters ? (
        <div className="mb-4">
          <Button size="sm" onClick={() => { setAccount(''); setTask(''); setAttempt(''); setEnv(''); setExit(''); setEventType(''); setFrom(''); setTo('') }}>清除筛选</Button>
        </div>
      ) : null}
      {error ? <Alert variant="destructive" className="mb-4">{error.message}</Alert> : null}
      <PageState pending={isPending} error={error} empty={events.length === 0} emptyText={hasFilters ? '没有符合筛选条件的审计事件' : '尚无审计事件'}>
        <Table
          columns={[
            { header: '事件', width: '20%', render: event => (
              <div>
                <p className="anywhere font-semibold">{event.event_type}</p>
                <p className="text-xs text-muted">#{event.id}</p>
              </div>
            ) },
            { header: '关联', width: '27%', render: event => (
              <div className="space-y-0.5 text-sm">
                {event.account_id ? <p className="anywhere">账号：<Link to={`/accounts/${event.account_id}`} className="text-primary hover:underline">{event.account_id}</Link></p> : null}
                {event.task_id ? <p className="anywhere">任务：<Link to={`/tasks/${event.task_id}`} className="text-primary hover:underline">{event.task_id}</Link></p> : null}
                {event.attempt_id ? <p className="anywhere">Attempt：<Link to={`/attempts/${event.attempt_id}`} className="text-primary hover:underline">{event.attempt_id}</Link></p> : null}
              </div>
            ) },
            { header: '环境 / 出口', width: '24%', render: event => (
              <div>
                <p className="anywhere text-sm">
                  {event.browser_env_alias ? <Link to={`/browsers/${encodeURIComponent(event.browser_env_alias)}`} className="text-primary hover:underline">{event.browser_env_alias}</Link> : '—'}
                  {' / '}
                  {event.network_exit_id ? <Link to={`/network-exits/${encodeURIComponent(event.network_exit_id)}`} className="text-primary hover:underline">{event.network_exit_id}</Link> : '—'}
                </p>
                <p className="text-xs text-muted">绑定版本 {event.binding_version || '—'}</p>
              </div>
            ) },
            { header: '原因 / 时间', width: '29%', render: event => (
              <div>
                <p className="anywhere text-sm">{event.reason_code || event.outcome || '—'}</p>
                <p className="text-xs text-muted">{new Date(event.created_at).toLocaleString('zh-CN')}</p>
              </div>
            ) },
          ]}
          rows={events} rowKey={event => event.id} minWidth="1000px"
        />
      </PageState>
      {total > 25 ? (
        <div className="mt-4 flex items-center justify-end gap-4">
          <Button size="sm" disabled={page === 1} onClick={() => setPage(current => current - 1)}>上一页</Button>
          <p className="text-sm text-muted">第 {page} / {Math.ceil(total / 25)} 页</p>
          <Button size="sm" disabled={page * 25 >= total} onClick={() => setPage(current => current + 1)}>下一页</Button>
        </div>
      ) : null}
    </div>
  )
}