/**
 * Admin 后台 - 评估汇总页(报刊风)
 *
 * 功能:
 * - 按 provider / model / prompt_version / mode / league_code 筛选
 * - 展示汇总统计卡片(已结算/已评估/跳过数)
 * - 准确率对比表格
 * - 空态与加载态
 */
import { useCallback, useEffect, useState } from 'react'
import { fetchEvalSummary, fetchLeagues } from '../dal'
import type { EvalSummary } from '../types'
import { Card, CardBody, CardHeader, StatCard, Badge, DataTable, Alert, Spinner, EmptyState } from '../components'

interface Filters {
  provider: string
  model: string
  prompt_version: string
  mode: string
  league_code: string
}

const EMPTY_FILTERS: Filters = { provider: '', model: '', prompt_version: '', mode: '', league_code: '' }

export default function EvalPage() {
  const [filters, setFilters] = useState<Filters>(EMPTY_FILTERS)
  const [leagues, setLeagues] = useState<Array<{ code: string; name: string }>>([])
  const [data, setData] = useState<EvalSummary | null>(null)
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)

  useEffect(() => {
    fetchLeagues()
      .then(l => setLeagues(l.map(x => ({ code: x.code, name: x.name }))))
      .catch(() => setLeagues([]))
  }, [])

  const load = useCallback(async () => {
    setLoading(true)
    setError(null)
    try {
      const params: Record<string, string> = {}
      if (filters.provider) params.provider = filters.provider
      if (filters.model) params.model = filters.model
      if (filters.prompt_version) params.prompt_version = filters.prompt_version
      if (filters.mode) params.mode = filters.mode
      if (filters.league_code) params.league_code = filters.league_code
      const result = await fetchEvalSummary(params)
      setData(result)
    } catch (err: unknown) {
      setError(err instanceof Error ? err.message : '加载失败')
    } finally {
      setLoading(false)
    }
  }, [filters])

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

  const handleChange = (key: keyof Filters) => (e: React.ChangeEvent<HTMLSelectElement | HTMLInputElement>) => {
    setFilters(f => ({ ...f, [key]: e.target.value }))
  }

  const handleReset = () => setFilters(EMPTY_FILTERS)

  const summary = data?.summary ?? []

  return (
    <div className="space-y-6">
      {/* 筛选控件 */}
      <Card>
        <CardHeader title="筛选条件" description="按提供商 / 模型 / 版本 / 模式 / 联赛过滤评估数据" />
        <CardBody>
          <div className="grid grid-cols-1 gap-3 sm:grid-cols-2 lg:grid-cols-5">
            <label className="block">
              <span className="text-2xs text-ink-500">提供商</span>
              <input
                type="text"
                value={filters.provider}
                onChange={handleChange('provider')}
                placeholder="如 openai"
                className="mt-1 w-full border border-ink-300 bg-paper-50 px-2.5 py-1.5 text-sm text-ink-900 placeholder:text-ink-300 focus:border-ink-900 focus:outline-none"
              />
            </label>
            <label className="block">
              <span className="text-2xs text-ink-500">模型</span>
              <input
                type="text"
                value={filters.model}
                onChange={handleChange('model')}
                placeholder="如 gpt-4o"
                className="mt-1 w-full border border-ink-300 bg-paper-50 px-2.5 py-1.5 text-sm text-ink-900 placeholder:text-ink-300 focus:border-ink-900 focus:outline-none"
              />
            </label>
            <label className="block">
              <span className="text-2xs text-ink-500">Prompt 版本</span>
              <input
                type="text"
                value={filters.prompt_version}
                onChange={handleChange('prompt_version')}
                placeholder="如 v1"
                className="mt-1 w-full border border-ink-300 bg-paper-50 px-2.5 py-1.5 text-sm text-ink-900 placeholder:text-ink-300 focus:border-ink-900 focus:outline-none"
              />
            </label>
            <label className="block">
              <span className="text-2xs text-ink-500">模式</span>
              <select
                value={filters.mode}
                onChange={handleChange('mode')}
                className="mt-1 w-full border border-ink-300 bg-paper-50 px-2.5 py-1.5 text-sm text-ink-900 focus:border-ink-900 focus:outline-none"
              >
                <option value="">全部</option>
                <option value="single">single</option>
                <option value="multi">multi</option>
              </select>
            </label>
            <label className="block">
              <span className="text-2xs text-ink-500">联赛</span>
              <select
                value={filters.league_code}
                onChange={handleChange('league_code')}
                className="mt-1 w-full border border-ink-300 bg-paper-50 px-2.5 py-1.5 text-sm text-ink-900 focus:border-ink-900 focus:outline-none"
              >
                <option value="">全部</option>
                {leagues.map(l => (
                  <option key={l.code} value={l.code}>{l.name ?? l.code}</option>
                ))}
              </select>
            </label>
          </div>
          <div className="mt-3 flex gap-2">
            <button onClick={load} disabled={loading} className="btn btn-sm">
              {loading ? '加载中…' : '应用筛选'}
            </button>
            <button onClick={handleReset} disabled={loading} className="btn btn-sm btn-ghost">
              重置
            </button>
          </div>
        </CardBody>
      </Card>

      {/* 错误态 */}
      {error && <Alert kind="error" title="加载失败" message={error} />}

      {/* 汇总统计 */}
      {data && (
        <div className="grid grid-cols-2 gap-4 sm:grid-cols-4">
          <StatCard label="已结算总数" value={data.total_settled} hint="含 degraded" />
          <StatCard label="筛选后已结算" value={data.filtered_settled} hint="应用筛选条件后" />
          <StatCard label="实际评估" value={data.evaluated} hint="status=success 且比分齐全" />
          <StatCard label="跳过 degraded" value={data.skipped_degraded} hint="不计入准确率" />
        </div>
      )}

      {/* 准确率表格 */}
      <Card>
        <CardHeader
          title="准确率对比"
          description="按 provider × 模型聚合,仅统计有效预测"
        />
        <CardBody>
          {loading ? (
            <div className="flex items-center justify-center py-12">
              <Spinner />
            </div>
          ) : summary.length === 0 ? (
            <EmptyText text="暂无评估数据,请调整筛选条件或先完成预测与结算" />
          ) : (
            <DataTable
              columns={[
                { key: 'provider', label: '提供商' },
                { key: 'model', label: '模型' },
                { key: 'total', label: '评估条数' },
                { key: 'accuracy_1x2', label: '1X2 准确率', render: (row: any) => (
                  <span className="tabular-nums">{row.accuracy_1x2 != null ? `${row.accuracy_1x2}%` : '—'}</span>
                ) },
                { key: 'avg_score_rmse', label: '比分 RMSE', render: (row: any) => (
                  <span className="tabular-nums">{row.avg_score_rmse != null ? row.avg_score_rmse.toFixed(2) : '—'}</span>
                ) },
                { key: 'avg_subjective_confidence', label: '平均置信度', render: (row: any) => (
                  <span className="tabular-nums">{row.avg_subjective_confidence != null ? row.avg_subjective_confidence.toFixed(2) : '—'}</span>
                ) },
              ]}
              data={summary}
              rowKey={(row: any) => `${row.provider}-${row.model}`}
              emptyText="暂无评估数据"
            />
          )}
        </CardBody>
      </Card>
    </div>
  )
}