/**
 * 后端 API 客户端。基址走 NEXT_PUBLIC_API_BASE,缺省指向本地后端 :8000。
 *
 * JSON 契约与后端 schemas.py 对齐(camelCase),所以返回体可直接喂给页面 state。
 * 注意:api_key 读取时后端永远打码,写回打码占位符表示"不改 key"(写时哨兵)。
 */

export const API_BASE =
  process.env.NEXT_PUBLIC_API_BASE_URL ?? "http://localhost:8000";

export type ModelType = "LLM" | "ASR" | "TTS" | "Realtime" | "Embedding";
async function request<T>(path: string, init?: RequestInit): Promise<T> {
  const res = await fetch(`${API_BASE}${path}`, {
    headers: { "Content-Type": "application/json" },
    ...init,
  });
  if (!res.ok) {
    let detail = `请求失败 (${res.status})`;
    try {
      const body = (await res.json()) as { detail?: string };
      if (body?.detail) detail = body.detail;
    } catch {
      // 响应体不是 JSON,沿用默认错误信息
    }
    throw new Error(detail);
  }
  // 204 / 空响应保护
  const text = await res.text();
  return (text ? JSON.parse(text) : undefined) as T;
}

// ---------- 接口定义驱动的模型注册表 ----------
export type InterfaceField = {
  key: string;
  label: string;
  group: "values" | "secrets";
  type: "text" | "url" | "password" | "number" | "boolean" | "select";
  required: boolean;
  default?: unknown;
  options?: string[];
};

export type InterfaceDefinition = {
  interfaceType: string;
  name: string;
  capability: ModelType;
  fieldSchema: { fields: InterfaceField[] };
  enabled: boolean;
  version: number;
};

export type ModelResource = {
  id: string;
  name: string;
  capability: ModelType;
  interfaceType: string;
  values: Record<string, unknown>;
  secrets: Record<string, unknown>;
  enabled: boolean;
  isDefault: boolean;
  updatedAt?: string | null;
};

export type ModelResourceUpsert = Omit<
  ModelResource,
  "id" | "capability" | "updatedAt"
>;

export type ModelResourceTestResult = {
  ok: boolean;
  latencyMs: number | null;
  message: string;
  detail: string;
};

export const interfaceDefinitionsApi = {
  list: (capability?: ModelType) =>
    request<InterfaceDefinition[]>(
      `/api/interface-definitions${capability ? `?capability=${capability}` : ""}`,
    ),
};

export const modelResourcesApi = {
  list: () => request<ModelResource[]>("/api/model-resources"),
  create: (body: ModelResourceUpsert) =>
    request<ModelResource>("/api/model-resources", {
      method: "POST",
      body: JSON.stringify(body),
    }),
  update: (id: string, body: ModelResourceUpsert) =>
    request<ModelResource>(`/api/model-resources/${id}`, {
      method: "PUT",
      body: JSON.stringify(body),
    }),
  test: (body: ModelResourceUpsert, id?: string) =>
    request<ModelResourceTestResult>(
      id ? `/api/model-resources/${id}/test` : "/api/model-resources/test",
      {
        method: "POST",
        body: JSON.stringify(body),
      },
    ),
  duplicate: (id: string) =>
    request<ModelResource>(`/api/model-resources/${id}/duplicate`, {
      method: "POST",
    }),
  remove: (id: string) =>
    request<{ ok: boolean }>(`/api/model-resources/${id}`, {
      method: "DELETE",
    }),
};

// ---------- 助手 ----------
export type AssistantType =
  | "prompt"
  | "workflow"
  | "dify"
  | "fastgpt"
  | "opencode";
export type RuntimeMode = "pipeline" | "realtime";

/** 后端 AssistantOut(宽表 STI:瘦字段平铺,workflow 用 graph)。apiKey 读时打码 */
export type Assistant = {
  id: string;
  name: string;
  type: AssistantType;
  runtimeMode: RuntimeMode;
  greeting: string;
  enableInterrupt: boolean;
  modelResourceIds: Partial<Record<ModelType, string>>;
  knowledgeBaseId: string | null;
  prompt: string;
  apiUrl: string;
  apiKey: string;
  appId: string;
  graph: Record<string, unknown>;
  updatedAt?: string | null;
};

export type AssistantUpsert = Omit<Assistant, "id" | "updatedAt">;

export const assistantsApi = {
  list: () => request<Assistant[]>("/api/assistants"),
  get: (id: string) => request<Assistant>(`/api/assistants/${id}`),
  create: (body: AssistantUpsert) =>
    request<Assistant>("/api/assistants", {
      method: "POST",
      body: JSON.stringify(body),
    }),
  update: (id: string, body: AssistantUpsert) =>
    request<Assistant>(`/api/assistants/${id}`, {
      method: "PUT",
      body: JSON.stringify(body),
    }),
  // 服务端整行复制(含真 key,密钥不经浏览器)
  duplicate: (id: string) =>
    request<Assistant>(`/api/assistants/${id}/duplicate`, { method: "POST" }),
  remove: (id: string) =>
    request<{ ok: boolean }>(`/api/assistants/${id}`, { method: "DELETE" }),
};

// ---------- 知识库 ----------
export type KnowledgeBase = {
  id: string;
  name: string;
  description: string;
  embeddingModelResourceId: string | null;
  status: string;
  updatedAt?: string | null;
};

export const knowledgeBasesApi = {
  list: () => request<KnowledgeBase[]>("/api/knowledge-bases"),
};