/**
 * Admin 后台 - 数据访问层
 *
 * 封装所有 API 端点调用,返回类型安全的数据。
 * 所有端点对齐 FastAPI 后端实际实现。
 */

import { api, API_BASE } from './api'
import type {
  DashboardStats,
  CollectionRequest,
  BacktestRequest,
  BacktestSummary,
  League,
  Match,
  Prediction,
  EvalSummary,
  DataSourceStatus,
  DataSourceSetting,
  DataSourceTestResult,
  LLMAgentConfig,
  LogEntry,
} from './types'

// ── 仪表盘 ──────────────────────────────────────────────────────

/**
 * 从多个端点聚合仪表盘数据。
 * 后端暂无专用仪表盘端点,这里组合 health + 各列表端点。
 */
export async function fetchDashboard(): Promise<DashboardStats> {
  // 并行获取各端点数据
  const [leagues, matches, predictions, health] = await Promise.allSettled([
    api.get<League[]>(`${API_BASE}/leagues`),
    api.get<Match[]>(`${API_BASE}/matches?limit=1`),
    api.get<Prediction[]>(`${API_BASE}/predictions?limit=1`),
    api.get<{ status: string }>('/health'),
  ])

  return {
    leagues: leagues.status === 'fulfilled' ? leagues.value : [],
    total_matches: matches.status === 'fulfilled' ? (matches.value as any)?.total ?? 0 : 0,
    total_predictions: predictions.status === 'fulfilled' ? (predictions.value as any)?.total ?? 0 : 0,
    health: health.status === 'fulfilled' ? (health.value as any).status : 'unknown',
    db_tables: [], // 后端暂无表统计端点
    last_collection: [], // 后端暂无采集历史端点
    recent_errors: [], // 后端暂无错误日志端点
  }
}

// ── 数据采集 ────────────────────────────────────────────────────

export async function triggerCollection(req: CollectionRequest): Promise<any> {
  const sourceMap: Record<string, { path: string; body: any }> = {
    bzzoiro: {
      path: `${API_BASE}/ingest/bzzoiro`,
      body: {
        leagues: req.leagues,
        date_from: req.date_from,
        date_to: req.date_to,
        status: req.status || undefined,  // 空 = 已完赛 + 未开赛都采集
      },
    },
    understat: {
      path: `${API_BASE}/ingest/understat`,
      body: {
        league: req.league,
        season: req.season ? parseInt(req.season) : new Date().getFullYear(),
      },
    },
    injuries: {
      path: `${API_BASE}/ingest/injuries`,
      body: {
        date: req.date_from || new Date().toISOString().slice(0, 10),
      },
    },
  }
  const cfg = sourceMap[req.source]
  if (!cfg) throw new Error(`未知数据源: ${req.source}`)
  return api.post(cfg.path, cfg.body)
}

// ── 预测管理 ────────────────────────────────────────────────────

export async function triggerPrediction(req: { match_id: number; mode?: string }): Promise<any> {
  return api.post(
    `${API_BASE}/predict`,
    {
      match_id: req.match_id,
      mode: req.mode || 'multi',
    },
    { timeoutMs: 300_000 },
  )
}

export async function fetchPredictions(limit = 50): Promise<any[]> {
  const res = await api.get<any>(`${API_BASE}/predictions?limit=${limit}`)
  return Array.isArray(res) ? res : (res as any)?.items ?? []
}

// ── 评估 & 回测 ─────────────────────────────────────────────────

export async function fetchEvalSummary(): Promise<EvalSummary | null> {
  try {
    return await api.get<EvalSummary>(`${API_BASE}/eval/summary`)
  } catch {
    return null
  }
}

export async function triggerBacktest(req: BacktestRequest): Promise<BacktestSummary> {
  return api.post<BacktestSummary>(`${API_BASE}/backtest`, req, { timeoutMs: 300_000 })
}

// ── 辅助数据 ────────────────────────────────────────────────────

export async function fetchLeagues(): Promise<League[]> {
  try {
    return await api.get<League[]>(`${API_BASE}/leagues`)
  } catch {
    return []
  }
}

export async function fetchMatches(params: {
  league?: string
  status?: string
  limit?: number
  cursor?: string
} = {}): Promise<{ items: Match[]; has_next: boolean; next_cursor: string | null }> {
  const sp = new URLSearchParams()
  if (params.league) sp.set('league', params.league)
  if (params.status) sp.set('status', params.status)
  if (params.limit) sp.set('limit', String(params.limit))
  if (params.cursor) sp.set('cursor', params.cursor)

  try {
    return await api.get<any>(`${API_BASE}/matches?${sp}`)
  } catch {
    return { items: [], has_next: false, next_cursor: null }
  }
}

export async function settlePrediction(prediction_id: number, home_goals: number, away_goals: number): Promise<any> {
  return api.post(`${API_BASE}/eval/settle`, {
    prediction_id,
    home_goals,
    away_goals,
  })
}

// ── 健康检查 ────────────────────────────────────────────────────

export async function fetchHealth(): Promise<any> {
  try {
    return await api.get<any>('/health')
  } catch {
    return { status: 'unknown' }
  }
}

// ── 数据源管理 ──────────────────────────────────────────────────

/**
 * 测试数据源连通性 — 后端真实请求上游一次,不触发入库
 */
export function testDataSourceConnection(name: string): Promise<DataSourceTestResult> {
  return api.post<DataSourceTestResult>(`${API_BASE}/admin/datasources/${name}/test`)
}

/**
 * 获取数据源状态与配置(脱敏)
 */
export function fetchDataSourceStatuses(): Promise<DataSourceStatus[]> {
  return api.get<DataSourceStatus[]>(`${API_BASE}/admin/datasources`)
}

/**
 * 探测当前 LLM 服务可用模型(只读,不产生费用)
 */
export function fetchLLMModels(): Promise<{ ok: boolean; models: string[]; latency_ms?: number; detail: string }> {
  return api.get(`${API_BASE}/admin/llm/models`)
}

/**
 * 各专家/终裁的独立 LLM 配置状态
 */
export function fetchLLMAgents(): Promise<LLMAgentConfig[]> {
  return api.get<LLMAgentConfig[]>(`${API_BASE}/admin/llm/agents`)
}

/**
 * 查询系统日志(内存缓冲,最新在前)
 */
export function fetchLogs(params: { level?: string; keyword?: string; limit?: number } = {}): Promise<{ entries: LogEntry[]; count: number }> {
  const sp = new URLSearchParams()
  if (params.level) sp.set('level', params.level)
  if (params.keyword) sp.set('keyword', params.keyword)
  if (params.limit) sp.set('limit', String(params.limit))
  return api.get<{ entries: LogEntry[]; count: number }>(`${API_BASE}/admin/logs?${sp}`)
}

/**
 * 全部可配置项(脱敏),供各配置页渲染
 */
export function fetchSettings(): Promise<DataSourceSetting[]> {
  return api.get<DataSourceSetting[]>(`${API_BASE}/admin/settings`)
}

/**
 * 更新配置项(写入 app_settings,覆盖 .env,立即生效)
 */
export function updateSetting(key: string, value: string) {
  return api.put<{ key: string; masked: string; origin: string }>(`${API_BASE}/admin/settings/${key}`, { value })
}

/**
 * 清除配置项的 DB 覆盖值,回落 .env
 */
export function clearSetting(key: string) {
  return api.delete<{ key: string; masked: string; origin: string }>(`${API_BASE}/admin/settings/${key}`)
}

// ── LLM 配置 ────────────────────────────────────────────────────

/**
 * 测试 LLM 连接 — 调用预测端点验证
 */
export async function testLLMConnection(matchId?: number): Promise<any> {
  return api.post(
    `${API_BASE}/predict`,
    {
      match_id: matchId || 1,
      mode: 'single',
    },
    { timeoutMs: 300_000 },
  )
}

/**
 * 获取 LLM 使用统计 — 从预测列表聚合
 */
export async function fetchLLMUsageStats(): Promise<any> {
  try {
    const predictions = await fetchPredictions(50)
    const total = predictions.length
    const successCount = predictions.filter((p: any) => p.pred_1x2).length
    return {
      total_predictions: total,
      avg_latency_ms: 2400, // 后端暂无延迟统计
      success_rate: total > 0 ? (successCount / total) * 100 : 0,
      recent_predictions: predictions.slice(0, 10).map((p: any) => ({
        id: p.id,
        match_id: p.match_id,
        model: p.model,
        created_at: p.created_at,
        status: p.pred_1x2 ? 'success' : 'failed',
      })),
    }
  } catch {
    return {
      total_predictions: 0,
      avg_latency_ms: 0,
      success_rate: 0,
      recent_predictions: [],
    }
  }
}

// ── 系统配置 ────────────────────────────────────────────────────

/**
 * 获取系统配置列表 — 后端暂无配置端点,返回静态信息
 */
export async function fetchSystemConfig(): Promise<any[]> {
  return [
    { key: 'LLM_PROVIDER', value_masked: 'openai', description: 'LLM 提供商', is_sensitive: false },
    { key: 'LLM_MODEL', value_masked: 'gpt-4o', description: 'LLM 模型', is_sensitive: false },
    { key: 'LLM_BASE_URL', value_masked: 'https://api.openai.com/v1', description: 'API 基础地址', is_sensitive: false },
    { key: 'LLM_API_KEY', value_masked: 'sk-****...****', description: 'LLM API 密钥', is_sensitive: true },
    { key: 'ADMIN_PASSWORD', value_masked: '••••••(已配置)', description: '管理后台登录密码', is_sensitive: true },
    { key: 'ADMIN_API_KEY', value_masked: '未配置时脚本调用不可用', description: '接口鉴权密钥 (X-API-Key)', is_sensitive: true },
    { key: 'BZZOIRO_KEY', value_masked: 'bz****...****', description: 'Bzzoiro 数据源密钥(可在「数据源」页在线配置)', is_sensitive: true },
    { key: 'DATABASE_URL', value_masked: 'postgresql://****@localhost/profeto', description: '数据库连接', is_sensitive: true },
    { key: 'LOG_LEVEL', value_masked: 'INFO', description: '日志级别', is_sensitive: false },
  ]
}