import { apiFetch, readSSE, type SSESummary } from "@/lib/api";
import type { Page } from "@/lib/admin-api";

/**
 * 投顾 Agent（/api/advisor-agent/*）适配层。
 * 该系列接口的成功码是 0 而不是 200（agent_success），已在 lib/api.ts 统一兼容。
 */

export interface AgentMessage {
  role?: string;
  content?: string;
  [key: string]: unknown;
}

export interface AgentDraft {
  draft_id?: string;
  id?: string;
  title?: string | null;
  content?: string | null;
  intent?: string | null;
  status?: string | null;
  customer_id?: number | null;
  create_time?: string | null;
  update_time?: string | null;
  structured_data?: Record<string, unknown> | null;
  [key: string]: unknown;
}

export interface DataQueryResult {
  query_id?: string;
  answer?: string;
  summary?: string;
  columns?: string[];
  rows?: Record<string, unknown>[];
  total?: number;
  page?: number;
  page_size?: number;
  [key: string]: unknown;
}

export interface FundAnalysisResult {
  analysis_text?: string;
  items?: Record<string, unknown>[];
  [key: string]: unknown;
}

export interface TalkScriptResult {
  script?: string;
  content?: string;
  scene?: string;
  [key: string]: unknown;
}

/** 会话上下文：scope=customer 时必须带 customer_id，否则后端会尝试从问题文本里猜客户。 */
export interface ChatScope {
  sessionId?: string;
  customerId?: number | null;
  scope?: "customer" | "advisor";
}

function qs(params: Record<string, string | number | undefined | null>) {
  const search = new URLSearchParams();
  for (const [key, value] of Object.entries(params)) {
    if (value !== undefined && value !== null && value !== "") search.set(key, String(value));
  }
  const text = search.toString();
  return text ? `?${text}` : "";
}

export const assistantApi = {
  /** GET /session/{session_id}/history —— 读取本人短期 Agent 会话记录。 */
  sessionHistory: (sessionId: string) =>
    apiFetch<AgentMessage[]>(`/advisor-agent/session/${encodeURIComponent(sessionId)}/history`),

  /** POST /chat/stream —— 读取 SSE，并支持调用方实时消费事件。 */
  chatOnce(
    body: {
      query: string;
      session_id?: string;
      scope?: "customer" | "advisor";
      customer_id?: number | null;
    },
    signal?: AbortSignal
  ): Promise<SSESummary> {
    return readSSE("/advisor-agent/chat/stream", body, signal);
  },

  /** POST /data-query —— 自然语言查客户数据（非流式）。 */
  dataQuery: (body: {
    query: string;
    session_id?: string;
    max_rows?: number;
    page?: number;
    page_size?: number;
  }) =>
    apiFetch<DataQueryResult>("/advisor-agent/data-query", {
      method: "POST",
      body: JSON.stringify(body),
    }),

  /** GET /draft/list */
  drafts: (params: { customer_id?: number; status?: string; page?: number; page_size?: number } = {}) =>
    apiFetch<Page<AgentDraft> & { items?: AgentDraft[] }>(`/advisor-agent/draft/list${qs(params)}`),

  /** GET /draft/{draft_id} */
  draft: (draftId: string) =>
    apiFetch<AgentDraft>(`/advisor-agent/draft/${encodeURIComponent(draftId)}`),

  /** PUT /draft/{draft_id}/save */
  saveDraft: (
    draftId: string,
    body: { title?: string; content?: string; structured_data?: Record<string, unknown> }
  ) =>
    apiFetch<AgentDraft>(`/advisor-agent/draft/${encodeURIComponent(draftId)}/save`, {
      method: "PUT",
      body: JSON.stringify(body),
    }),

  /** POST /draft/{draft_id}/operate —— 后端目前仅支持 operation=discard。 */
  operateDraft: (draftId: string, operation: "discard") =>
    apiFetch<AgentDraft>(`/advisor-agent/draft/${encodeURIComponent(draftId)}/operate`, {
      method: "POST",
      body: JSON.stringify({ operation }),
    }),

  /** POST /rebalance/run —— 异步受理，返回 accepted/queued，草稿稍后生成。 */
  runRebalance: (query: string) =>
    apiFetch<{ accepted?: boolean; status?: string }>("/advisor-agent/rebalance/run", {
      method: "POST",
      body: JSON.stringify({ query }),
    }),

  /** POST /fund-analysis —— query 里需包含基金代码，如「分析 000001」。 */
  fundAnalysis: (query: string) =>
    apiFetch<FundAnalysisResult>("/advisor-agent/fund-analysis", {
      method: "POST",
      body: JSON.stringify({ query }),
    }),

  /** POST /generate-talk-script */
  generateTalkScript: (query: string) =>
    apiFetch<TalkScriptResult>("/advisor-agent/generate-talk-script", {
      method: "POST",
      body: JSON.stringify({ query }),
    }),
};

/** 生成本地会话 ID（后端 session_id 为空时自动创建，这里只是前端约定的稳定键）。 */
export function newSessionId(): string {
  return `advisor-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
}