/**
 * 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)。
 */

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

export type ModelType = "LLM" | "ASR" | "TTS" | "Realtime" | "Embedding";
export type InterfaceType = "openai" | "xfyun" | "dashscope" | "gemini";

/** 列表/详情返回(api_key 已打码) */
export type Credential = {
  id: string;
  name: string;
  modelId: string;
  type: ModelType;
  interfaceType: InterfaceType;
  apiUrl: string;
  apiKey: string;
  isDefault: boolean;
};

/** 创建/更新入参。apiKey 留空或打码值 → 后端保留旧 key */
export type CredentialUpsert = {
  name: string;
  modelId: string;
  type: ModelType;
  interfaceType: InterfaceType;
  apiUrl: string;
  apiKey: string;
  isDefault: boolean;
};

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;
}

export const credentialsApi = {
  list: () => request<Credential[]>("/api/credentials"),
  create: (body: CredentialUpsert) =>
    request<Credential>("/api/credentials", {
      method: "POST",
      body: JSON.stringify(body),
    }),
  update: (id: string, body: CredentialUpsert) =>
    request<Credential>(`/api/credentials/${id}`, {
      method: "PUT",
      body: JSON.stringify(body),
    }),
  remove: (id: string) =>
    request<{ ok: boolean }>(`/api/credentials/${id}`, { method: "DELETE" }),
};