/**
 * Admin 后台 - 仪表盘(报刊风)
 *
 * 展示:
 * - 数据流水线状态(采集 → 预测 → 评估,每步的实际数据量)
 * - 近期预测活动(24h / 7d / 总计)
 * - 快捷操作入口(带工作流引导)
 */

import { useEffect, useState, useCallback } from 'react'
import { fetchAdminStats, fetchIngestStatus, fetchDashboard } from '../dal'
import type { AdminStats, IngestSourceStatus, DashboardStats } from '../types'
import { Card, CardBody, CardHeader, Alert, SkeletonBlock } from '../components'

/** 工作流步骤卡片 */
const STEPS = [
  { to: '/admin/collection', step: '1', title: '采集数据', desc: 'bzzoiro: 赛程 / 积分榜 / 比赛统计(xG、射门、控球等)', icon: '◈' },
  { to: '/admin/predictions', step: '2', title: '运行预测', desc: '调 LLM 多专家生成比分预测', icon: '◆' },
  { to: '/admin/eval', step: '3', title: '评估准确率', desc: '结算后查看 1X2 命中率与校准度', icon: '◈' },
]

export default function Dashboard() {
  const [stats, setStats] = useState<AdminStats | null>(null)
  const [ingest, setIngest] = useState<IngestSourceStatus[]>([])
  const [dash, setDash] = useState<DashboardStats | null>(null)
  const [loading, setLoading] = useState(true)

  const load = useCallback(async () => {
    setLoading(true)
    const [s, i, d] = await Promise.allSettled([
      fetchAdminStats(),
      fetchIngestStatus(),
      fetchDashboard(),
    ])
    if (s.status === 'fulfilled') setStats(s.value)
    if (i.status === 'fulfilled') setIngest(i.value.sources)
    if (d.status === 'fulfilled') setDash(d.value)
    setLoading(false)
  }, [])

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

  const sourceByName = Object.fromEntries(ingest.map(s => [s.name, s]))
  const bzzoiro = sourceByName['bzzoiro']

  return (
    <div className="space-y-6">
      {/* ── 工作流引导(采集 → 预测 → 评估) ── */}
      <div className="grid gap-4 sm:grid-cols-3">
        {STEPS.map((s, i) => (
          <a
            key={s.to}
            href={s.to}
            className="group border border-ink-300 p-4 transition-colors hover:border-ink-900 hover:bg-paper-100"
          >
            <div className="flex items-center gap-2.5">
              <span className="flex h-7 w-7 items-center justify-center border border-ink-900 font-serif text-xs font-bold text-ink-900">
                {s.step}
              </span>
              <span className="font-serif text-sm font-bold text-ink-900">{s.title}</span>
              <span className="ml-auto text-ink-300 transition-colors group-hover:text-press" aria-hidden="true">→</span>
            </div>
            <p className="mt-2 text-2xs leading-relaxed text-ink-500">{s.desc}</p>
            {i < STEPS.length - 1 && <span className="sr-only">下一步</span>}
          </a>
        ))}
      </div>

      {/* ── 数据源健康一览 ── */}
      <Card>
        <CardHeader
          title="数据源健康"
          description="各源最近采集时间与数据量(只读快照,详细配置见「数据源」页)"
        />
        <CardBody className="px-0">
          {loading ? (
            <div className="space-y-2 px-4 sm:px-5">
              {[1, 2, 3].map(i => <SkeletonBlock key={i} className="h-8 w-full" />)}
            </div>
          ) : (
            <div>
              {[
                { name: 'bzzoiro', label: 'Bzzoiro', st: bzzoiro },
              ].map(({ name, label, st }) => {
                const hasData = st && st.recent_count > 0
                const keyOk = st?.key_configured !== false
                return (
                  <div key={name} className="flex items-center justify-between border-b border-ink-200 px-4 py-2.5 last:border-b-0 sm:px-5">
                    <span className="text-xs font-medium text-ink-700">{label}</span>
                    <span className="flex items-center gap-3 text-2xs">
                      {hasData ? (
                        <>
                          <span className="tabular-nums text-ink-500">{st.recent_count.toLocaleString()} 条</span>
                          <span className="text-ink-400">{st.last_success_at ? new Date(st.last_success_at).toLocaleString('zh-CN', { month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', hour12: false }) : ''}</span>
                        </>
                      ) : keyOk ? (
                        <span className="text-ink-400">无数据</span>
                      ) : (
                        <span className="text-press">未配置 Key</span>
                      )}
                      <span
                        aria-hidden="true"
                        className={`inline-block h-1.5 w-1.5 ${hasData && keyOk ? 'bg-ink-900' : 'bg-press'}`}
                      />
                    </span>
                  </div>
                )
              })}
            </div>
          )}
        </CardBody>
      </Card>

      {/* ── 近期预测活动 ── */}
      <Card>
        <CardHeader title="近期预测活动" description="预测 API 的调用量统计" />
        <CardBody>
          {stats ? (
            <div className="space-y-4">
              <div className="grid grid-cols-3 gap-4 text-center">
                <div>
                  <div className="font-serif text-3xl font-bold tabular-nums text-ink-900">{stats.predictions.last_24h}</div>
                  <div className="mt-1 text-2xs text-ink-400">近 24 小时</div>
                </div>
                <div>
                  <div className="font-serif text-3xl font-bold tabular-nums text-ink-900">{stats.predictions.last_7d}</div>
                  <div className="mt-1 text-2xs text-ink-400">近 7 天</div>
                </div>
                <div>
                  <div className="font-serif text-3xl font-bold tabular-nums text-ink-900">{stats.predictions.total}</div>
                  <div className="mt-1 text-2xs text-ink-400">累计</div>
                </div>
              </div>
              {/* F3 修复: 真实比赛计数(非 limit=100 近似) */}
              <div className="grid grid-cols-4 gap-3 border-t border-ink-200 pt-3 text-center">
                <div>
                  <div className="font-serif text-xl font-bold tabular-nums text-ink-900">{stats.matches?.total ?? 0}</div>
                  <div className="mt-0.5 text-2xs text-ink-400">比赛总数</div>
                </div>
                <div>
                  <div className="font-serif text-xl font-bold tabular-nums text-ink-900">{stats.matches?.finished ?? 0}</div>
                  <div className="mt-0.5 text-2xs text-ink-400">已完赛</div>
                </div>
                <div>
                  <div className="font-serif text-xl font-bold tabular-nums text-ink-900">{stats.stats?.total ?? 0}</div>
                  <div className="mt-0.5 text-2xs text-ink-400">统计行</div>
                </div>
                <div>
                  <div className="font-serif text-xl font-bold tabular-nums text-ink-900">{stats.standings?.total ?? 0}</div>
                  <div className="mt-0.5 text-2xs text-ink-400">积分榜</div>
                </div>
              </div>
            </div>
          ) : (
            <div className="flex justify-center py-4"><SkeletonBlock className="h-12 w-64" /></div>
          )}
        </CardBody>
      </Card>

      {/* ── 已入库联赛 ── */}
      {dash && dash.leagues.length > 0 && (
        <Card>
          <CardHeader title="已入库联赛" />
          <CardBody>
            <div className="flex flex-wrap gap-2">
              {dash.leagues.map(l => (
                <span key={l.code} className="border border-ink-200 px-2.5 py-1 text-xs text-ink-700">
                  {l.name_zh || l.name}
                  <span className="ml-1.5 font-mono text-2xs text-ink-400">{l.code}</span>
                </span>
              ))}
            </div>
          </CardBody>
        </Card>
      )}
    </div>
  )
}