/**
 * Admin 后台 - 数据完整性分析页
 *
 * 回答三个问题:
 *   1. 数据是否齐全(各联赛比赛/统计/积分榜量级)
 *   2. 字段是否齐全(每张统计表各字段非空率)
 *   3. 覆盖是否新鲜(最近一场/最近一次采集)
 */

import { useEffect, useState, useCallback, useRef } from 'react'
import { fetchDataCompleteness } from '../dal'
import type { DataCompletenessResponse } from '../dal'
import {
  Card, CardBody, CardHeader, SectionHeader, Alert,
  ProgressBar, Spinner, EmptyState,
} from '../components'

const FIELD_LABELS: Record<string, string> = {
  xg: 'xG 预期进球',
  shots: '射门',
  possession: '控球率',
  corners: '角球',
  fouls: '犯规',
  big_chances: '绝佳机会',
  cards: '红黄牌',
}

function pctColor(pct: number): string {
  if (pct >= 80) return 'bg-emerald-500'
  if (pct >= 50) return 'bg-amber-500'
  return 'bg-rose-500'
}

/** 根据问题描述生成可操作的修复链接 */
function getIssueAction(issue: string): { href: string; label: string; code: string } | null {
  // 提取联赛代码(大写字母+数字,如 E0, SP1)
  const codeMatch = issue.match(/\b([A-Z]{1,2}\d?)\b/)
  const code = codeMatch ? codeMatch[1] : ''
  if (!code) return null

  if (issue.includes('无已完赛比赛')) {
    return { href: `/admin/collection?task=events&league=${code}`, label: '去采集', code }
  }
  if (issue.includes('无统计回填') || issue.includes('统计覆盖率')) {
    return { href: `/admin/collection?task=stats&league=${code}`, label: '去回填', code }
  }
  if (issue.includes('无积分榜')) {
    return { href: `/admin/collection?task=standings&league=${code}`, label: '去采集', code }
  }
  return null
}

export default function DataCompletenessPage() {
  const [data, setData] = useState<DataCompletenessResponse | null>(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const [highlightedLeague, setHighlightedLeague] = useState<string | null>(null)
  const leagueRefs = useRef<Record<string, HTMLDivElement | null>>({})

  const load = useCallback(async () => {
    setLoading(true)
    setError(null)
    try {
      const d = await fetchDataCompleteness()
      setData(d)
    } catch (err) {
      setError(err instanceof Error ? err.message : '加载失败')
    } finally {
      setLoading(false)
    }
  }, [])

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

  // 点击问题项 → 滚动到对应联赛卡片并高亮
  const scrollToLeague = useCallback((code: string) => {
    setHighlightedLeague(code)
    // 使用 requestAnimationFrame 确保 DOM 已更新
    requestAnimationFrame(() => {
      const el = leagueRefs.current[code]
      if (el) {
        el.scrollIntoView({ behavior: 'smooth', block: 'start' })
      }
    })
    // 5秒后移除高亮
    setTimeout(() => setHighlightedLeague(null), 5000)
  }, [])

  return (
    <div className="space-y-6">
      <SectionHeader
        title="数据完整性"
        description="按联赛统计 bzzoiro 数据采集覆盖度。每 5 秒自动刷新,或点击右上角按钮手动刷新。"
        action={
          <button onClick={load} disabled={loading} className="btn-sm btn-outline">
            {loading ? <><Spinner /> 刷新中</> : '刷新'}
          </button>
        }
      />

      {error && <Alert kind="error" title="加载失败" message={error} onClose={() => setError(null)} />}

      {loading && !data && (
        <div className="flex justify-center py-12"><Spinner /></div>
      )}

      {data && (
        <>
          {/* 全局概览 */}
          <div className="grid gap-4 sm:grid-cols-3">
            <Card>
              <CardBody className="text-center">
                <p className="text-2xl font-bold text-ink-900">{data.totals.finished_matches}</p>
                <p className="text-xs text-ink-500">已完赛比赛(总计)</p>
              </CardBody>
            </Card>
            <Card>
              <CardBody className="text-center">
                <p className="text-2xl font-bold text-ink-900">{data.totals.stats_rows}</p>
                <p className="text-xs text-ink-500">统计行数</p>
              </CardBody>
            </Card>
            <Card>
              <CardBody className="text-center">
                <p className="text-2xl font-bold text-ink-900">
                  {data.totals.stats_coverage_pct}%
                </p>
                <p className="text-xs text-ink-500">统计覆盖率(有统计 / 已完赛)</p>
              </CardBody>
            </Card>
          </div>

          {/* 健康问题(可操作) */}
          <Card>
            <CardHeader title="健康摘要" />
            <CardBody>
              <div className="space-y-2">
                {data.issues.map((issue, i) => {
                  const action = getIssueAction(issue)
                  return (
                    <Alert
                      key={i}
                      kind={issue.includes('良好') ? 'ok' : issue.includes('建议') || issue.includes('仅') ? 'warning' : 'error'}
                      title={issue.includes('良好') ? '数据良好' : '需要关注'}
                      message={issue}
                      action={action ? (
                        <div className="flex items-center gap-2">
                          <button
                            onClick={() => scrollToLeague(action.code)}
                            className="btn btn-sm whitespace-nowrap"
                          >
                            定位
                          </button>
                          <a href={action.href} className="btn btn-sm whitespace-nowrap">
                            {action.label}
                          </a>
                        </div>
                      ) : undefined}
                    />
                  )
                })}
              </div>
            </CardBody>
          </Card>

          {/* 各联赛详情 */}
          <div className="space-y-4">
            {data.leagues.map(league => {
              const finished = league.matches.finished
              const statsPct = finished > 0 ? Math.round((league.stats.rows / finished) * 100) : 0
              const isHighlighted = highlightedLeague === league.code
              return (
                <div
                  key={league.code}
                  ref={el => { leagueRefs.current[league.code] = el }}
                  className={`transition-all duration-500 ${isHighlighted ? 'ring-2 ring-press bg-press-wash/40 scale-[1.01]' : ''}`}
                >
                <Card>
                  <CardHeader
                    title={league.name}
                    description={[
                      league.country,
                      `已完赛 ${finished} 场 / 未开赛 ${league.matches.scheduled} 场`,
                      league.matches.latest_match ? `最近: ${league.matches.latest_match.slice(0, 10)}` : '',
                      league.standings.rows > 0 ? `积分榜 ${league.standings.rows} 队` : '',
                    ].filter(Boolean).join(' · ')}
                  />
                  <CardBody className="space-y-4">
                    {/* 统计覆盖率进度条 */}
                    <div>
                      <div className="mb-1 flex items-center justify-between text-xs">
                        <span className="text-ink-600">统计回填覆盖率</span>
                        <span className="font-medium text-ink-900">
                          {league.stats.rows} / {finished} ({statsPct}%)
                        </span>
                      </div>
                      <ProgressBar value={statsPct} />
                    </div>

                    {/* 字段覆盖率矩阵 */}
                    {league.stats.rows > 0 ? (
                      <div>
                        <p className="mb-2 text-xs font-medium text-ink-600">字段覆盖率(有值行数 / 总行数)</p>
                        <div className="grid gap-2 sm:grid-cols-2 lg:grid-cols-4">
                          {Object.entries(league.stats.fields).map(([key, info]) => (
                            <div key={key} className="rounded border border-ink-100 px-3 py-2">
                              <div className="mb-1 flex items-center justify-between">
                                <span className="text-xs text-ink-600">{FIELD_LABELS[key] ?? key}</span>
                                <span className="text-xs font-medium text-ink-900">{info.pct}%</span>
                              </div>
                              <div className="h-1.5 w-full overflow-hidden rounded-full bg-ink-100">
                                <div
                                  className={`h-full rounded-full ${pctColor(info.pct)}`}
                                  style={{ width: `${info.pct}%` }}
                                />
                              </div>
                              <p className="mt-0.5 text-2xs text-ink-400">{info.count} / {league.stats.rows} 行</p>
                            </div>
                          ))}
                        </div>
                      </div>
                    ) : finished > 0 ? (
                      <Alert kind="warning" title="缺少统计数据" message="该联赛有已完赛比赛但无统计行,请运行「统计回填」采集。" />
                    ) : (
                      <Alert kind="warning" title="缺少比赛数据" message="该联赛暂无已完赛比赛,请运行「比赛数据」采集。" />
                    )}
                  </CardBody>
                </Card>
                </div>
              )
            })}
          </div>

          <p className="text-center text-2xs text-ink-400">
            生成时间: {new Date(data.generated_at).toLocaleString('zh-CN', { hour12: false })}
          </p>
        </>
      )}
    </div>
  )
}