meezi/web/dashboard/src/lib/api/client.ts

import axios, {
  type AxiosError,
  type InternalAxiosRequestConfig,
} from "axios";
import type { ApiResponse, AuthTokenResponse } from "./types";
import { getOrCreateTerminalId } from "@/lib/terminal";
import { useAuthStore } from "@/lib/stores/auth.store";

const baseURL =
  process.env.NEXT_PUBLIC_API_URL ?? "https://localhost:7208";

export const api = axios.create({
  baseURL,
  headers: { "Content-Type": "application/json" },
});

api.interceptors.request.use((config) => {
  if (typeof window !== "undefined") {
    const token = localStorage.getItem("meezi_access_token");
    if (token) {
      config.headers.Authorization = `Bearer ${token}`;
    }
    config.headers["X-Meezi-Terminal-Id"] = getOrCreateTerminalId();
  }
  return config;
});

/**
 * Shared in-flight refresh promise so that a burst of concurrent 401s triggers
 * exactly one POST /api/auth/refresh instead of one per failed request.
 */
let refreshPromise: Promise<string | null> | null = null;

async function refreshAccessToken(): Promise<string | null> {
  if (typeof window === "undefined") return null;
  const refreshToken = localStorage.getItem("meezi_refresh_token");
  if (!refreshToken) return null;
  try {
    // Bare axios call (not `api`) to avoid recursing through this interceptor.
    const { data } = await axios.post<ApiResponse<AuthTokenResponse>>(
      `${baseURL}/api/auth/refresh`,
      { refreshToken },
      { headers: { "Content-Type": "application/json" } }
    );
    if (!data.success || !data.data) return null;
    useAuthStore.getState().setAuth(data.data);
    return data.data.accessToken;
  } catch {
    return null;
  }
}

api.interceptors.response.use(
  (response) => response,
  async (error: AxiosError<ApiResponse<unknown>>) => {
    const status = error.response?.status;
    const original = error.config as
      | (InternalAxiosRequestConfig & { _retry?: boolean })
      | undefined;

    // Expired access token → try a one-time refresh, then replay the request.
    if (
      status === 401 &&
      original &&
      !original._retry &&
      typeof window !== "undefined" &&
      !original.url?.includes("/api/auth/")
    ) {
      original._retry = true;
      refreshPromise ??= refreshAccessToken().finally(() => {
        refreshPromise = null;
      });
      const newToken = await refreshPromise;
      if (newToken) {
        original.headers.Authorization = `Bearer ${newToken}`;
        return api(original);
      }
    }

    const apiError = error.response?.data?.error;
    if (apiError?.code) {
      return Promise.reject(new ApiClientError(apiError.code, apiError.message, undefined, status));
    }
    if (status === 401 && typeof window !== "undefined") {
      const path = window.location.pathname;
      const isPublicGuest = path.startsWith("/q/") || path.startsWith("/q");
      const isAdmin = path.includes("/admin");
      if (!isPublicGuest && !isAdmin) {
        localStorage.removeItem("meezi_access_token");
        localStorage.removeItem("meezi_refresh_token");
        localStorage.removeItem("meezi_auth");
        const locale = path.split("/")[1] ?? "fa";
        window.location.href = `/${locale}/login`;
      }
    }
    return Promise.reject(error);
  }
);

export interface PagedMeta {
  total: number;
  page: number;
  pageSize: number;
}

export interface PagedApiResponse<T> {
  success: boolean;
  data?: T[];
  meta?: PagedMeta;
  error?: { code: string; message: string; field?: string };
}

export async function apiGet<T>(url: string): Promise<T> {
  const { data } = await api.get<ApiResponse<T>>(url);
  if (!data.success || data.data === undefined) {
    throw new Error(data.error?.message ?? "Request failed");
  }
  return data.data;
}

export async function apiGetPaged<T>(url: string): Promise<{ items: T[]; meta: PagedMeta }> {
  const { data } = await api.get<PagedApiResponse<T>>(url);
  if (!data.success || data.data === undefined || !data.meta) {
    throw new Error(data.error?.message ?? "Request failed");
  }
  return { items: data.data, meta: data.meta };
}

export class ApiClientError extends Error {
  constructor(
    public readonly code: string,
    message: string,
    /** Payload returned alongside a non-success response (e.g. CHOOSE_CAFE choices). */
    public readonly payload?: unknown,
    /** HTTP status, when known — lets callers (e.g. the outbox) tell 5xx (retry) from 4xx (give up). */
    public readonly status?: number
  ) {
    super(message);
    this.name = "ApiClientError";
  }
}

/** Options for mutating requests. An `idempotencyKey` is sent as the
 * `Idempotency-Key` header so the server safely de-duplicates retries
 * (used by the offline outbox; harmless when omitted). */
export interface WriteOptions {
  idempotencyKey?: string;
}

function writeConfig(opts?: WriteOptions) {
  if (!opts?.idempotencyKey) return undefined;
  return { headers: { "Idempotency-Key": opts.idempotencyKey } };
}

export async function apiPost<T, B = unknown>(url: string, body?: B, opts?: WriteOptions): Promise<T> {
  const { data } = await api.post<ApiResponse<T>>(url, body, writeConfig(opts));
  if (!data.success || data.data === undefined) {
    const code = data.error?.code ?? "REQUEST_FAILED";
    throw new ApiClientError(code, data.error?.message ?? "Request failed", data.data);
  }
  return data.data;
}

export async function apiPut<T, B = unknown>(url: string, body?: B, opts?: WriteOptions): Promise<T> {
  const { data } = await api.put<ApiResponse<T>>(url, body, writeConfig(opts));
  if (!data.success || data.data === undefined) {
    const code = data.error?.code ?? "REQUEST_FAILED";
    throw new ApiClientError(code, data.error?.message ?? "Request failed");
  }
  return data.data;
}

export async function apiPatch<T, B = unknown>(url: string, body?: B, opts?: WriteOptions): Promise<T> {
  const { data } = await api.patch<ApiResponse<T>>(url, body, writeConfig(opts));
  if (!data.success || data.data === undefined) {
    const code = data.error?.code ?? "REQUEST_FAILED";
    throw new ApiClientError(code, data.error?.message ?? "Request failed");
  }
  return data.data;
}

export async function apiDelete(url: string, opts?: WriteOptions): Promise<void> {
  const { data } = await api.delete<ApiResponse<unknown>>(url, writeConfig(opts));
  if (!data.success) {
    const code = data.error?.code ?? "REQUEST_FAILED";
    throw new ApiClientError(code, data.error?.message ?? "Request failed");
  }
}

/** GET binary response (QR PNG, Excel export, etc.) with auth headers. */
export async function apiGetBlob(path: string): Promise<Blob> {
  const response = await api.get(path, { responseType: "blob" });
  return response.data as Blob;
}

/** Public GET JSON (no auth required). */
export async function apiGetPublic<T>(path: string): Promise<T> {
  const { data } = await api.get<ApiResponse<T>>(path);
  if (!data.success || data.data === undefined) {
    throw new ApiClientError(
      data.error?.code ?? "REQUEST_FAILED",
      data.error?.message ?? "Request failed"
    );
  }
  return data.data;
}

/** Public POST JSON (no auth required). */
export async function apiPostPublic<T, B = unknown>(path: string, body?: B): Promise<T> {
  const { data } = await api.post<ApiResponse<T>>(path, body);
  if (!data.success || data.data === undefined) {
    throw new ApiClientError(
      data.error?.code ?? "REQUEST_FAILED",
      data.error?.message ?? "Request failed"
    );
  }
  return data.data;
}

export function openBlobInNewTab(blob: Blob): void {
  const url = URL.createObjectURL(blob);
  window.open(url, "_blank");
}

export async function apiDownload(path: string, filename: string): Promise<void> {
  const blob = await apiGetBlob(path);
  const objectUrl = URL.createObjectURL(blob);
  const anchor = document.createElement("a");
  anchor.href = objectUrl;
  anchor.download = filename;
  anchor.click();
  URL.revokeObjectURL(objectUrl);
}

export async function apiUpload<T>(url: string, file: File): Promise<T> {
  const form = new FormData();
  form.append("file", file);
  const { data } = await api.post<ApiResponse<T>>(url, form, {
    headers: { "Content-Type": "multipart/form-data" },
  });
  if (!data.success || data.data === undefined) {
    throw new Error(data.error?.message ?? "Upload failed");
  }
  return data.data;
}

export function resolveMediaUrl(path?: string | null): string | undefined {
  if (!path) return undefined;
  if (path.startsWith("http://") || path.startsWith("https://")) return path;
  const base = process.env.NEXT_PUBLIC_API_URL ?? "http://localhost:5080";
  return `${base.replace(/\/$/, "")}${path.startsWith("/") ? path : `/${path}`}`;
}