/**
 * Admin 后台 - 数据采集页面(bzzoiro 单一数据源)
 *
 * 三个采集任务:
 *   events    — 比赛日程与比分
 *   standings — 联赛积分榜
 *   stats     — 已完赛比赛详细统计回填
 *   all       — 依次执行以上三项
 *
 * 响应式布局: 移动端单列,桌面端双列
 */

import { useEffect, useState, useCallback, useRef } from 'react'
import { triggerCollection, fetchLeagues, fetchIngestStatus, fetchIngestJob } from '../dal'
import type { IngestSourceStatus } from '../types'
import type { CollectionRequest, League, IngestJob } from '../types'
import { Card, CardBody, CardHeader, Badge, SectionHeader, Alert, Spinner } from '../components'

const TASKS = [
  { value: 'events', label: '比赛数据', desc: '赛程 / 比分 / 未开赛安排', icon: '⚽' },
  { value: 'standings', label: '积分榜', desc: '联赛排名 / 积分 / xG差 / 近期走势', icon: '🏆' },
  { value: 'stats', label: '统计回填', desc: '已完赛比赛的 xG / 射门 / 控球等详细统计', icon: '📊' },
  { value: 'all', label: '全量采集', desc: '依次采集比赛 + 积分榜 + 统计回填', icon: '⏵⏵' },
] as const

type TaskStatus = 'idle' | 'running' | 'done' | 'error'

const JOB_STATUS_LABEL: Record<IngestJob['status'], string> = {
  pending: '等待中',
  running: '执行中',
  success: '已完成',
  failed: '失败',
}

/** job.result 摘要 → 多行文本(错误只显示条数,明细见「采集失败」页与系统日志) */
function summarizeResult(result: Record<string, any> | null): string[] {
  if (!result) return []
  return Object.entries(result).map(([k, v]) => {
    if (v && typeof v === 'object') {
      const bits: string[] = []
      for (const [kk, vv] of Object.entries(v)) {
        if (kk === 'errors') {
          if (Array.isArray(vv) && vv.length > 0) bits.push(`错误 ${vv.length} 条`)
        } else if (vv !== null && vv !== undefined) {
          bits.push(`${kk} ${vv}`)
        }
      }
      return `${k}: ${bits.length ? bits.join(' · ') : '无变更'}`
    }
    return `${k}: ${String(v)}`
  })
}

export default function CollectionPage() {
  const [leagues, setLeagues] = useState<League[]>([])
  const [task, setTask] = useState<string>('events')
  const [leagueCode, setLeagueCode] = useState('')

  // 从 URL 查询参数预填充(支持从「数据完整性」页跳转)
  useEffect(() => {
    const sp = new URLSearchParams(window.location.search)
    const taskParam = sp.get('task')
    const leagueParam = sp.get('league')
    if (taskParam && ['events', 'standings', 'stats', 'all'].includes(taskParam)) {
      setTask(taskParam)
    }
    if (leagueParam) {
      setLeagueCode(leagueParam)
    }
  }, [])
  const [dateFrom, setDateFrom] = useState('')
  const [dateTo, setDateTo] = useState('')
  const [season, setSeason] = useState('')
  const [ingestStatus, setIngestStatus] = useState('')
  const [limit, setLimit] = useState(100)
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)
  const [result, setResult] = useState<{ title: string; detail: string } | null>(null)

  // 任务进度反馈
  const [taskStatus, setTaskStatus] = useState<TaskStatus>('idle')
  const [taskStartedAt, setTaskStartedAt] = useState<number | null>(null)
  const pollRef = useRef<ReturnType<typeof setInterval> | null>(null)
  const jobPollRef = useRef<ReturnType<typeof setInterval> | null>(null)
  const [ingestSnap, setIngestSnap] = useState<IngestSourceStatus | null>(null)
  // 采集任务状态(ingest_jobs):提交后有 job_id 即轮询,替代「30 秒盲等」
  const [job, setJob] = useState<IngestJob | null>(null)

  const loadLeagues = useCallback(async () => {
    const lg = await fetchLeagues()
    setLeagues(lg)
  }, [])

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

  // 轮询采集状态(任务启动后)
  const startPolling = useCallback(() => {
    if (pollRef.current) clearInterval(pollRef.current)
    pollRef.current = setInterval(async () => {
      try {
        const { sources } = await fetchIngestStatus()
        const bz = sources.find(s => s.name === 'bzzoiro')
        if (bz) setIngestSnap(bz)
      } catch { /* ignore */ }
    }, 5_000)
  }, [])

  const stopPolling = useCallback(() => {
    if (pollRef.current) { clearInterval(pollRef.current); pollRef.current = null }
  }, [])

  // job 轮询:3 秒一次,终态(success/failed)自动停止;10 分钟兜底防泄漏
  const stopJobPolling = useCallback(() => {
    if (jobPollRef.current) { clearInterval(jobPollRef.current); jobPollRef.current = null }
  }, [])

  const startJobPolling = useCallback((jobId: string) => {
    stopJobPolling()
    let ticks = 0
    jobPollRef.current = setInterval(async () => {
      ticks += 1
      if (ticks > 200) { stopJobPolling(); setTaskStatus('done'); return }
      try {
        const j = await fetchIngestJob(jobId)
        setJob(j)
        if (j.status === 'success') { stopJobPolling(); setTaskStatus('done') }
        else if (j.status === 'failed') { stopJobPolling(); setTaskStatus('error') }
      } catch { /* 网络抖动忽略,下个周期重试 */ }
    }, 3_000)
  }, [stopJobPolling])

  useEffect(() => () => { stopPolling(); stopJobPolling() }, [stopPolling, stopJobPolling])

  const isEventsTask = task === 'events' || task === 'all'

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault()
    setError(null)
    setResult(null)
    setJob(null)
    setLoading(true)
    setTaskStatus('running')
    setTaskStartedAt(Date.now())

    try {
      const body: CollectionRequest = {
        source: 'bzzoiro',
        leagues: leagueCode ? [leagueCode] : undefined,
        task: task as CollectionRequest['task'],
        limit,
        season: season || undefined,
        status: ingestStatus || undefined,
        date_from: isEventsTask ? dateFrom || undefined : undefined,
        date_to: isEventsTask ? dateTo || undefined : undefined,
      }
      const resp = await triggerCollection(body)
      const jobId: string | undefined = resp?.job_id
      if (jobId) {
        // 有 job_id:轮询任务状态直至终态(3 秒/次)
        setResult({
          title: '采集任务已启动',
          detail: `任务 ID: ${jobId}。正在跟踪执行进度,完成后展示结果摘要。`,
        })
        startJobPolling(jobId)
      } else {
        // 兜底:后端未返回 job_id(旧版本),退回「30 秒盲等 + 系统日志」
        setResult({
          title: '采集任务已启动',
          detail: '正在后台执行(上游限速时可能需要数分钟)。完成结果与错误请到「系统日志」页查看(支持自动刷新)。',
        })
        startPolling()
        setTimeout(() => {
          setTaskStatus('done')
          stopPolling()
        }, 30_000)
      }
    } catch (err: unknown) {
      setTaskStatus('error')
      setError(err instanceof Error ? err.message : '采集触发失败')
      stopPolling()
      stopJobPolling()
    } finally {
      setLoading(false)
    }
  }

  const elapsed = taskStartedAt ? Math.round((Date.now() - taskStartedAt) / 1000) : 0

  return (
    <div className="space-y-6">
      <SectionHeader
        title="数据采集"
        description="bzzoiro 单一数据源:比赛数据、积分榜、比赛统计三条管线。采集为后台异步执行。"
      />

      <div className="grid gap-6 lg:grid-cols-2">
        {/* 采集表单 */}
        <Card>
          <CardHeader title="新建采集任务" />
          <CardBody>
            <form onSubmit={handleSubmit} className="space-y-4">
              {/* 任务类型 */}
              <div>
                <label className="mb-1.5 block text-xs text-ink-500">采集任务</label>
                <div className="grid grid-cols-2 gap-2 sm:grid-cols-4">
                  {TASKS.map(t => (
                    <button
                      key={t.value}
                      type="button"
                      onClick={() => setTask(t.value)}
                      className={`rounded-lg border px-3 py-2 text-left text-xs transition-colors ${
                        task === t.value
                          ? 'border-brand-500 bg-brand-50 text-brand-700'
                          : 'border-ink-200 text-ink-600 hover:border-ink-300'
                      }`}
                    >
                      <span className="mr-1">{t.icon}</span>
                      <span className="font-medium">{t.label}</span>
                    </button>
                  ))}
                </div>
              </div>

              {/* 联赛选择 */}
              <div>
                <label className="mb-1.5 block text-xs text-ink-500">联赛</label>
                <select
                  value={leagueCode}
                  onChange={e => setLeagueCode(e.target.value)}
                  className="field w-full"
                >
                  <option value="">全部联赛</option>
                  {leagues.map(l => (
                    <option key={l.code} value={l.code}>{l.name_zh || l.name}</option>
                  ))}
                </select>
              </div>

              {/* events/all 任务专用: 比赛状态 + 日期 */}
              {isEventsTask && (
                <>
                  <div>
                    <label className="mb-1.5 block text-xs text-ink-500">比赛状态</label>
                    <select
                      value={ingestStatus}
                      onChange={e => setIngestStatus(e.target.value)}
                      className="field w-full"
                    >
                      <option value="">全部(已完赛 + 未开赛)</option>
                      <option value="finished">仅已完赛</option>
                      <option value="scheduled">仅未开赛</option>
                    </select>
                  </div>
                  <div className="grid grid-cols-1 gap-3 sm:grid-cols-2">
                    <div>
                      <label className="mb-1.5 block text-xs text-ink-500">起始日期</label>
                      <input
                        type="date"
                        value={dateFrom}
                        onChange={e => setDateFrom(e.target.value)}
                        className="field w-full"
                      />
                    </div>
                    <div>
                      <label className="mb-1.5 block text-xs text-ink-500">结束日期</label>
                      <input
                        type="date"
                        value={dateTo}
                        onChange={e => setDateTo(e.target.value)}
                        className="field w-full"
                      />
                    </div>
                  </div>
                </>
              )}

              {/* standings 任务专用: 赛季 */}
              {(task === 'standings') && (
                <div>
                  <label className="mb-1.5 block text-xs text-ink-500">赛季(留空取当前赛季)</label>
                  <input
                    type="text"
                    value={season}
                    onChange={e => setSeason(e.target.value)}
                    placeholder="如 2026-2027"
                    className="field w-full"
                  />
                </div>
              )}

              {/* stats 任务专用: 回填数量 */}
              {(task === 'stats') && (
                <div>
                  <label className="mb-1.5 block text-xs text-ink-500">单次最大回填比赛数(1-500)</label>
                  <input
                    type="number"
                    min={1}
                    max={500}
                    value={limit}
                    onChange={e => setLimit(parseInt(e.target.value) || 100)}
                    className="field w-full"
                  />
                  <p className="mt-1 text-2xs text-ink-400">
                    仅回填已有 source_event_id 且无统计的比赛(增量),上游限速约 1.2 秒/次。
                  </p>
                </div>
              )}

              {/* 消息提示 */}
              {error && <Alert kind="error" title="采集失败" message={error} onClose={() => setError(null)} />}
              {result && (
                <Alert
                  kind="ok"
                  title={result.title}
                  message={result.detail || undefined}
                  onClose={() => setResult(null)}
                />
              )}

              {/* 提交按钮 */}
              <button type="submit" disabled={loading} className="btn btn-solid w-full">
                {loading ? (<><Spinner /> 采集中</>) : '触发采集'}
              </button>
            </form>
          </CardBody>
        </Card>

        {/* 任务状态 + 数据源说明 */}
        <div className="space-y-6">
          {/* 任务进度 */}
          <Card>
            <CardHeader title="任务状态" />
            <CardBody>
              {taskStatus === 'idle' && (
                <p className="text-xs text-ink-400">尚未触发任务。</p>
              )}
              {taskStatus === 'running' && (
                <div className="space-y-3">
                  <div className="flex items-center gap-2 text-xs text-ink-700">
                    <Spinner />
                    <span>
                      {job
                        ? `${JOB_STATUS_LABEL[job.status]}(轮询中),已运行 ${elapsed}s…`
                        : `任务执行中,已运行 ${elapsed}s…`}
                    </span>
                  </div>
                  <p className="text-2xs text-ink-400">
                    后台异步执行,关闭页面不影响结果。可稍后查看「系统日志」确认完成。
                  </p>
                </div>
              )}
              {taskStatus === 'done' && (
                <div className="space-y-2">
                  <div className="flex items-center gap-2 text-xs text-emerald-700">
                    <span className="inline-block h-2 w-2 rounded-full bg-emerald-500" />
                    <span>
                      {job
                        ? `采集完成(${JOB_STATUS_LABEL[job.status]})`
                        : '任务已提交,后台执行中(可能尚未完成)'}
                    </span>
                  </div>
                  {job?.result && summarizeResult(job.result).length > 0 && (
                    <div className="rounded-md bg-ink-50 px-3 py-2">
                      {summarizeResult(job.result).map((line, i) => (
                        <p key={i} className="font-mono text-2xs leading-relaxed text-ink-600">{line}</p>
                      ))}
                    </div>
                  )}
                  {!job && (
                    <p className="text-2xs text-ink-400">
                      采集耗时取决于数据量。请到「系统日志」页查看最终结果。
                    </p>
                  )}
                </div>
              )}
              {taskStatus === 'error' && (
                <div className="space-y-2">
                  <p className="text-xs text-press">
                    {job?.status === 'failed' ? '采集任务失败' : '任务触发失败,请检查配置或网络。'}
                  </p>
                  {job?.error && (
                    <p className="break-all rounded-md bg-red-50 px-3 py-2 font-mono text-2xs text-press">
                      {job.error}
                    </p>
                  )}
                </div>
              )}
              {ingestSnap?.last_success_at && (
                <div className="mt-3 border-t border-ink-100 pt-3">
                  <p className="text-2xs text-ink-400">
                    bzzoiro 最近一次采集: {new Date(ingestSnap.last_success_at).toLocaleString('zh-CN', { hour12: false })}
                  </p>
                </div>
              )}
            </CardBody>
          </Card>

          {/* 数据源说明 */}
          <Card>
            <CardHeader title="采集任务说明" />
            <CardBody>
              <div className="space-y-3">
                {TASKS.map(t => (
                  <div key={t.value} className="border-b border-ink-200 px-1 py-3 last:border-b-0">
                    <div className="flex items-center gap-3">
                      <span>{t.icon}</span>
                      <Badge status="info">{t.label}</Badge>
                      <p className="text-xs text-ink-600">{t.desc}</p>
                    </div>
                  </div>
                ))}
              </div>

              <p className="mt-4 border-l-2 border-ink-300 pl-3 text-2xs leading-relaxed text-ink-500">
                采集接口需要管理员登录(401 表示登录已过期)。
                各管线基于 bzzoiro 单一数据源(Understat / injuries 已移除)。
                「统计回填」依赖「比赛数据」管线写入的 source_event_id,请先完成比赛采集。
              </p>
            </CardBody>
          </Card>
        </div>
      </div>
    </div>
  )
}