/** BossAi 2.0 API 客户端
 * 在 v1.0 基础上新增:案卡 CRUD、老板台聚合、我的团队、快捷指令、风险推送
 * 共享同一后端,新增端点向后兼容
 */
import type {
  AskResponse, EmotionMode, Expert, ExpertService, Consultation,
  FileInspectResponse, HistoryMessage, HistorySession, KnowledgeDoc,
  Scene, SessionMode, SessionResponse, Settings,
  Matter, MatterBoard, DashboardToday, DashboardSummary, TimelineItem, RiskAlert,
  ExpertRelation, QuickCommands,
} from '@/types'

const BASE = '/api'
const DEFAULT_TIMEOUT = 30000
const LONG_TIMEOUT = 60000

export const network = {
  isOnline: () => typeof navigator !== 'undefined' ? navigator.onLine : true,
  onChange: (cb: (online: boolean) => void) => {
    if (typeof window === 'undefined') return () => {}
    const handler = () => cb(navigator.onLine)
    window.addEventListener('online', handler)
    window.addEventListener('offline', handler)
    return () => {
      window.removeEventListener('online', handler)
      window.removeEventListener('offline', handler)
    }
  },
}

function authHeaders(): Record<string, string> {
  const token = typeof window !== 'undefined' ? localStorage.getItem('bossai_token') : null
  return token ? { Authorization: `Bearer ${token}` } : {}
}

async function fetchWithTimeout(url: string, init: RequestInit, timeout: number): Promise<Response> {
  const controller = new AbortController()
  const timer = setTimeout(() => controller.abort(), timeout)
  try {
    return await fetch(url, { ...init, signal: controller.signal })
  } catch (err) {
    if (err instanceof DOMException && err.name === 'AbortError') {
      throw new Error('请求超时,请检查网络后重试')
    }
    if (!navigator.onLine) throw new Error('网络已断开,请检查网络连接')
    throw err
  } finally {
    clearTimeout(timer)
  }
}

async function requestWithRetry<T>(
  path: string, init?: RequestInit, options?: { timeout?: number; retries?: number },
): Promise<T> {
  const timeout = options?.timeout ?? DEFAULT_TIMEOUT
  const maxRetries = options?.retries ?? 1
  let lastError: Error
  for (let attempt = 0; attempt <= maxRetries; attempt++) {
    if (!navigator.onLine) throw new Error('网络已断开,请检查网络连接')
    try {
      const isFormData = init?.body instanceof FormData
      const res = await fetchWithTimeout(BASE + path, {
        ...init,
        headers: {
          ...(isFormData ? {} : { 'Content-Type': 'application/json' }),
          ...authHeaders(),
          ...(init?.headers || {}),
        },
      }, timeout)
      if (res.status === 429) {
        const retryAfter = res.headers.get('Retry-After')
        const wait = retryAfter ? parseInt(retryAfter, 10) : 2
        throw new Error(`请求过于频繁,请 ${wait} 秒后重试`)
      }
      if (!res.ok) {
        const body = await res.json().catch(() => ({ detail: res.statusText }))
        let msg: string
        if (typeof body.detail === 'string') msg = body.detail
        else if (Array.isArray(body.detail) && body.detail.length > 0)
          msg = body.detail.map((e: { msg?: string }) => e.msg || JSON.stringify(e)).join('; ')
        else msg = `请求失败 ${res.status}`
        throw new Error(msg)
      }
      return res.json() as Promise<T>
    } catch (err) {
      lastError = err as Error
      const isRetryable = lastError.message.includes('超时') ||
        lastError.message.includes('网络') || lastError.message.includes('Failed to fetch')
      if (!isRetryable || attempt === maxRetries) throw lastError
      await new Promise(r => setTimeout(r, 1000 * (attempt + 1)))
    }
  }
  throw lastError!
}

async function request<T>(path: string, init?: RequestInit): Promise<T> {
  return requestWithRetry<T>(path, init)
}

export const api = {
  // ===== 基础 =====
  health: () => request<{ status: string; service: string }>('/health'),

  // ===== 认证 =====
  register: (phone: string, password: string, name: string = '') =>
    request<{ phone: string; name: string; token: string }>('/auth/register', {
      method: 'POST', body: JSON.stringify({ phone, password, name }),
    }),
  login: (phone: string, password: string) =>
    request<{ phone: string; name: string; token: string; role?: string; expert_id?: number; admin_id?: number }>('/auth/login', {
      method: 'POST', body: JSON.stringify({ phone, password }),
    }),

  // ===== 会话与提问(与 v1.0 兼容) =====
  createSession: (mode: SessionMode) =>
    request<SessionResponse>('/sessions', { method: 'POST', body: JSON.stringify({ mode }) }),

  /** 检查内存 session 是否存活(后端重启后内存 session 会丢失) */
  sessionAlive: (sid: string) =>
    request<{ alive: boolean }>(`/sessions/${sid}/alive`),

  ask: (sid: string, question: string, scene: Scene = 'legal', emotionMode?: EmotionMode) =>
    requestWithRetry<AskResponse>(`/sessions/${sid}/ask`, {
      method: 'POST', body: JSON.stringify({ question, scene, emotion_mode: emotionMode }),
    }, { timeout: LONG_TIMEOUT, retries: 0 }),

  askAnalyze: (
    sid: string, question: string, scene: Scene = 'legal', emotionMode?: EmotionMode,
    factAnswers?: Array<{ dim_key: string; dim_desc: string; answer: string }>, topic?: string,
  ) =>
    request<{
      need_ask: boolean; need_analysis: boolean; round: number;
      questions?: Array<{ dim_key: string; dim_desc: string; question: string }>;
      fact_summary?: string; question_type: string; risk_level: string;
      profile_facts?: Array<{ dim_key: string; dim_desc: string; answer: string }>;
      element_template?: Record<string, unknown>;
    }>(`/sessions/${sid}/ask-analyze`, {
      method: 'POST',
      body: JSON.stringify({ question, scene, emotion_mode: emotionMode, fact_answers: factAnswers, topic }),
    }),

  askStream: async (
    sid: string, question: string, scene: Scene = 'legal', emotionMode?: EmotionMode,
    callbacks?: {
      onRisk?: (risk: AskResponse['risk']) => void
      onDelta?: (content: string) => void
      onDone?: (data: Partial<AskResponse>) => void
      onError?: (error: string) => void
    },
    factAnswers?: Array<{ dim_key: string; dim_desc: string; answer: string }>,
  ) => {
    if (!navigator.onLine) { callbacks?.onError?.('网络已断开,请检查网络连接'); return }
    const controller = new AbortController()
    const timer = setTimeout(() => controller.abort(), LONG_TIMEOUT)
    try {
      const res = await fetch(`${BASE}/sessions/${sid}/ask-stream`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json', ...authHeaders() },
        body: JSON.stringify({ question, scene, emotion_mode: emotionMode, fact_answers: factAnswers }),
        signal: controller.signal,
      })
      if (!res.ok) {
        const detail = await res.json().catch(() => ({ detail: res.statusText }))
        callbacks?.onError?.(detail.detail || `请求失败 ${res.status}`); return
      }
      const reader = res.body?.getReader()
      if (!reader) { callbacks?.onError?.('浏览器不支持流式读取'); return }
      const decoder = new TextDecoder()
      let buffer = ''
      while (true) {
        const { done, value } = await reader.read()
        if (done) break
        buffer += decoder.decode(value, { stream: true })
        const parts = buffer.split('\n\n')
        buffer = parts.pop() || ''
        for (const part of parts) {
          if (!part.trim()) continue
          let eventType = 'message'; let dataLine = ''
          for (const line of part.split('\n')) {
            if (line.startsWith('event: ')) eventType = line.slice(7)
            else if (line.startsWith('data: ')) dataLine = line.slice(6)
          }
          if (!dataLine) continue
          try {
            const data = JSON.parse(dataLine)
            if (eventType === 'risk') callbacks?.onRisk?.(data)
            else if (eventType === 'delta') callbacks?.onDelta?.(data.content || '')
            else if (eventType === 'done') callbacks?.onDone?.(data)
            else if (eventType === 'error') callbacks?.onError?.(data.detail || '未知错误')
          } catch { /* 忽略解析失败 */ }
        }
      }
    } catch (err) {
      if (err instanceof DOMException && err.name === 'AbortError') callbacks?.onError?.('请求超时,请检查网络后重试')
      else callbacks?.onError?.(err instanceof Error ? err.message : '流式请求失败')
    } finally { clearTimeout(timer) }
  },

  destroy: (sid: string) =>
    request<{ destroyed: boolean; session_id: string }>(`/sessions/${sid}/destroy`, { method: 'POST' }),

  uploadFile: async (sid: string, file: File) => {
    const form = new FormData(); form.append('file', file)
    const res = await fetch(`${BASE}/sessions/${sid}/file`, { method: 'POST', body: form })
    if (!res.ok) {
      const detail = await res.json().catch(() => ({ detail: res.statusText }))
      throw new Error(detail.detail || `上传失败 ${res.status}`)
    }
    return res.json() as Promise<FileInspectResponse>
  },

  // ===== 画像 =====
  getProfile: () => requestWithRetry<Record<string, unknown>>('/profile/me', {}),
  updateProfile: (data: {
    industry?: string; company_size?: string; role?: string;
    risk_tolerance?: string; decision_style?: string; key_facts?: Record<string, string>;
  }) => request<{ updated: boolean }>('/profile/me', { method: 'PUT', body: JSON.stringify(data) }),
  getProfileHistory: () =>
    request<{ results: Array<{ id: number; version: number; profile: Record<string, unknown>; source: string; created_at: string }> }>('/profile/me/history'),

  // ===== 要素化立案 =====
  elementFiling: (sid: string, question: string, causeOfAction: string,
    factAnswers: Array<{ dim_key: string; dim_desc: string; answer: string }>, template?: Record<string, unknown>,
  ) => request<{
    cause_of_action: string;
    elements: Array<{ key: string; label: string; value: string }>;
    claims: string[]; filing_text: string;
  }>(`/sessions/${sid}/element-filing`, {
    method: 'POST',
    body: JSON.stringify({ question, cause_of_action: causeOfAction, fact_answers: factAnswers, template }),
  }),

  // ===== 话题与示例 =====
  getTopics: (scene: Scene = 'legal', existing?: string[]) =>
    request<{ topics: Array<{ title: string; desc: string; samples: string[] }> }>('/topics', {
      method: 'POST', body: JSON.stringify({ scene, existing }),
    }),
  generateSamples: (scene: Scene = 'legal', topic?: string, existing?: string[]) =>
    request<{ samples: string[] }>('/samples', {
      method: 'POST', body: JSON.stringify({ scene, topic, existing }),
    }),

  // ===== 每日热点问题 =====
  getDailyTopics: (scene: Scene) =>
    request<{ scene: string; questions: string[] }>(`/topics/daily?scene=${scene}`),
  recordSampleClick: (scene: Scene, question: string) =>
    request<{ recorded: boolean }>('/topics/click', {
      method: 'POST', body: JSON.stringify({ scene, question }),
    }),

  // ===== 管理端:热点问题 =====
  adminGetDailyTopics: (date?: string) =>
    request<{ results: Array<{ id: number; date: string; scene: string; questions: string[]; source: string; created_at: string }> }>(
      `/admin/daily-topics${date ? `?date=${date}` : ''}`,
    ),
  adminUpdateDailyTopics: (data: { scene: string; questions: string[]; date?: string }) =>
    request<{ updated: boolean; topic: { id: number; date: string; scene: string; questions: string[]; source: string } }>(
      '/admin/daily-topics', { method: 'POST', body: JSON.stringify(data) },
    ),
  adminGenerateDailyTopics: () =>
    request<{ generated: boolean; results: Record<string, { count: number; source: string; error?: string }> }>(
      '/admin/daily-topics/generate', { method: 'POST' },
    ),
  adminSampleClickStats: (days = 14) =>
    request<{ results: Array<{ scene: string; question: string; clicks: number }> }>(
      `/admin/sample-clicks?days=${days}`,
    ),

  // ===== 知识库 =====
  addKnowledge: (data: { title: string; content: string; source?: string; doc_type?: string; region?: string | null; effective_date?: string | null; keywords?: string | null }) =>
    request<KnowledgeDoc>('/knowledge', { method: 'POST', body: JSON.stringify(data) }),
  listKnowledge: (docType?: string) =>
    request<{ results: KnowledgeDoc[]; counts: Record<string, number>; total: number }>(`/knowledge${docType ? `?doc_type=${docType}` : ''}`),
  searchKnowledge: (q: string, docType?: string) =>
    request<{ results: KnowledgeDoc[] }>(`/knowledge/search?q=${encodeURIComponent(q)}${docType ? `&doc_type=${docType}` : ''}`),
  deleteKnowledge: (id: number) => request<{ deleted: boolean; id: number }>(`/knowledge/${id}`, { method: 'DELETE' }),
  vectorSearchKnowledge: (q: string, limit?: number) =>
    request<{ results: KnowledgeDoc[] }>(`/knowledge/vector-search?q=${encodeURIComponent(q)}${limit ? `&limit=${limit}` : ''}`),

  // ===== 设置 =====
  getSettings: () => request<{ settings: Settings }>('/settings'),
  updateSettings: (settings: Settings) =>
    request<{ updated: boolean; settings: Settings }>('/settings', { method: 'PUT', body: JSON.stringify({ settings }) }),

  // ===== 专家库(v1.0 兼容) =====
  listExperts: (category?: string) =>
    request<{ results: Expert[] }>(`/experts${category ? `?category=${category}` : ''}`),
  getExpert: (id: number) => request<Expert>(`/experts/${id}`),
  selectExpert: (expertId: number) =>
    request<{ service_id: number; status: string }>(`/experts/${expertId}/select`, { method: 'POST' }),
  myServices: () => request<{ results: ExpertService[] }>('/my/services'),
  myConsultations: (status?: string) =>
    request<{ results: Consultation[] }>(`/my/consultations${status ? `?status=${status}` : ''}`),
  createConsultation: (data: { expert_id: number; topic: string; context?: string; question?: string }) =>
    request<{ consultation_id: number; created_at: string; status: string }>('/consultations', {
      method: 'POST', body: JSON.stringify(data),
    }),
  rateConsultation: (consultationId: number, rating: number, comment: string = '') =>
    request<{ rating_id: number; created_at: string }>(`/consultations/${consultationId}/rate`, {
      method: 'POST', body: JSON.stringify({ consultation_id: consultationId, rating, comment }),
    }),
  cancelMyService: (serviceId: number) =>
    request<{ cancelled: boolean }>(`/my/services/${serviceId}/cancel`, { method: 'POST' }),

  // ===== 专家工作台 =====
  expertWorkbench: () =>
    request<{ expert: Expert; services: ExpertService[]; consultations: Consultation[] }>('/expert/workbench'),
  acceptService: (serviceId: number) =>
    request<{ accepted: boolean }>(`/expert/services/${serviceId}/accept`, { method: 'POST' }),
  cancelExpertService: (serviceId: number) =>
    request<{ cancelled: boolean }>(`/expert/services/${serviceId}/cancel`, { method: 'POST' }),
  replyConsultation: (consultationId: number, reply: string) =>
    request<{ replied: boolean }>(`/expert/consultations/${consultationId}/reply`, {
      method: 'POST', body: JSON.stringify({ reply }),
    }),

  // ===== 管理后台 =====
  adminListExperts: (status?: string) =>
    request<{ results: Expert[] }>(`/admin/experts${status ? `?status=${status}` : ''}`),
  adminCreateExpert: (data: {
    name: string; phone: string; password: string; category: string;
    title?: string; bio?: string; expertise?: string; avatar_url?: string | null;
    status?: string;
  }) => request<{ created: boolean; expert: Expert }>('/admin/experts', {
    method: 'POST', body: JSON.stringify(data),
  }),
  adminDeleteExpert: (expertId: number) =>
    request<{ deleted: boolean; expert_id: number }>(`/admin/experts/${expertId}`, { method: 'DELETE' }),
  adminUpdateExpertStatus: (expertId: number, status: 'active' | 'inactive') =>
    request<{ updated: boolean; expert_id: number; status: string }>(`/admin/experts/${expertId}/status`, {
      method: 'PATCH', body: JSON.stringify({ status }),
    }),
  adminUpdateExpert: (expertId: number, data: Partial<Pick<Expert, 'name' | 'category' | 'title' | 'bio' | 'expertise' | 'avatar_url' | 'status'>>) =>
    request<{ updated: boolean; expert: Expert }>(`/admin/experts/${expertId}`, { method: 'PATCH', body: JSON.stringify(data) }),
  adminUploadExpertAvatar: (expertId: number, file: File) => {
    const formData = new FormData(); formData.append('file', file)
    return requestWithRetry<{ avatar_url: string }>(`/admin/experts/${expertId}/avatar`, {
      method: 'POST', body: formData, headers: {},
    }, { timeout: 30000, retries: 0 })
  },
  adminListUsers: (q?: string) =>
    request<{ results: Array<{ id: number; phone: string; name: string; status: string; created_at: string; message_count: number; last_active: string | null; last_scene: string | null }> }>(`/admin/users${q ? `?q=${encodeURIComponent(q)}` : ''}`),
  adminResetPassword: (userId: number, password: string) =>
    request<{ reset: boolean }>(`/admin/users/${userId}/reset-password`, { method: 'POST', body: JSON.stringify({ password }) }),
  adminUpdateUserStatus: (userId: number, status: 'active' | 'inactive') =>
    request<{ status: string }>(`/admin/users/${userId}/status`, { method: 'POST', body: JSON.stringify({ status }) }),
  adminStats: () => request<{
    users: number; experts_active: number; experts_total: number;
    services_active: number; consultations_total: number; consultations_pending: number;
  }>('/admin/stats'),
  adminAiUsage: () => request<{
    total_questions: number
    active_users: number
    by_scene: Array<{ scene: string; count: number }>
    by_mode: Array<{ mode: string; count: number }>
    by_risk: Array<{ level: string; count: number }>
    by_inference: Array<{ location: string; count: number }>
    daily_trend: Array<{ date: string; count: number }>
    by_user: Array<{ phone_masked: string; questions: number; replies: number; last_active: string | null; top_scene: string | null }>
  }>('/admin/ai-usage'),
  adminExpertActivity: () => request<{
    total: number
    replied: number
    pending: number
    by_status: Array<{ status: string; count: number }>
    by_category: Array<{ category: string; count: number }>
    by_expert: Array<{ name: string; category: string; title: string; total: number; replied: number; pending: number; avg_rating: number; rating_count: number }>
    daily_trend: Array<{ date: string; count: number }>
    by_user: Array<{ phone_masked: string; consultations: number; last_active: string | null }>
  }>('/admin/expert-activity'),

  // ===== 对话历史 =====
  listHistorySessions: (mode?: 'normal' | 'confidential') =>
    request<{ results: HistorySession[] }>(`/history/sessions${mode ? `?mode=${mode}` : ''}`),
  getHistoryMessages: (sessionId: string) =>
    request<{ session_id: string; mode: 'normal' | 'confidential'; need_verify: boolean; message_count?: number; messages?: HistoryMessage[] }>(`/history/sessions/${sessionId}`),
  verifyHistory: (sessionId: string, password: string) =>
    request<{ session_id: string; mode: 'confidential'; verified: boolean; messages: HistoryMessage[] }>(`/history/sessions/${sessionId}/verify`, {
      method: 'POST', body: JSON.stringify({ password }),
    }),
  deleteHistory: (sessionId: string) =>
    request<{ deleted: boolean; session_id: string; count: number }>(`/history/sessions/${sessionId}`, { method: 'DELETE' }),

  // ===== 2.0 新增:案卡 =====
  /** 案卡看板(按状态分组) */
  getMatters: (status?: string) =>
    request<{ board: MatterBoard; total: number }>(`/matters${status ? `?status=${status}` : ''}`),
  /** 创建案卡(绑定会话) */
  createMatter: (data: { scene: Scene; title: string; session_id?: string }) =>
    request<Matter>('/matters', { method: 'POST', body: JSON.stringify(data) }),
  /** 案卡详情 */
  getMatter: (id: number) => request<Matter>(`/matters/${id}`),
  /** 通过 session_id 查询案卡(断点续接时恢复 matterId) */
  getMatterBySession: (sid: string) => request<Matter>(`/matters/by-session/${sid}`),
  /** 更新案卡状态 */
  updateMatterStatus: (id: number, status: Matter['status']) =>
    request<{ updated: boolean; status: string }>(`/matters/${id}/status`, { method: 'PATCH', body: JSON.stringify({ status }) }),
  /** 闭环案卡 */
  closeMatter: (id: number, executionResult?: string, executionNote?: string) =>
    request<{ closed: boolean; closed_at: string }>(`/matters/${id}/close`, {
      method: 'POST', body: JSON.stringify({ execution_result: executionResult, execution_note: executionNote }),
    }),

  // ===== 2.0 新增:老板台 =====
  getDashboardToday: () => request<DashboardToday>('/dashboard/today'),
  getDashboardSummary: () => request<DashboardSummary>('/dashboard/summary'),
  getDashboardTimeline: () => request<{ results: TimelineItem[] }>('/dashboard/timeline'),

  // ===== 2.0 新增:我的团队 =====
  getTeam: () => request<{ results: ExpertRelation[] }>('/team'),

  // ===== 2.0 新增:快捷指令 =====
  getQuickCommands: () => request<QuickCommands>('/quick-commands'),

  // ===== 2.0 新增:风险推送 =====
  getRiskAlerts: (unread?: boolean) =>
    request<{ results: RiskAlert[] }>(`/risk-alerts${unread ? '?unread=true' : ''}`),
  readRiskAlert: (id: number) =>
    request<{ read: boolean }>(`/risk-alerts/${id}/read`, { method: 'POST' }),
  scanRiskAlerts: () =>
    request<{ scanned: number; created: number }>('/risk-alerts/scan', { method: 'POST' }),

  // ===== 2.0 新增:决策日志 =====
  getDecisionsLog: (month?: string) =>
    request<{
      results: Matter[]
      by_month: Record<string, Matter[]>
      stats: { total: number; executed: number; execution_rate: number }
    }>(`/decisions-log${month ? `?month=${month}` : ''}`),
  updateExecutionResult: (matterId: number, executionResult: string, executionNote?: string) =>
    request<{ updated: boolean }>(`/matters/${matterId}/execution`, {
      method: 'PATCH',
      body: JSON.stringify({ execution_result: executionResult, execution_note: executionNote }),
    }),

  // ===== 可观测性 =====
  getMetrics: () => request<Record<string, unknown>>('/metrics'),
}