import fs from "fs";
import path from "path";
import type { Banner, Floor, NavItem, Promo, ServiceLink } from "../types";

function readJson<T>(relativePath: string): T {
  const filePath = path.join(process.cwd(), relativePath);
  const raw = fs.readFileSync(filePath, "utf-8");
  return JSON.parse(raw) as T;
}

function dataPathFor(locale: string | undefined, filename: string): string {
  const base = "data";
  const candidates = [
    locale ? path.join(base, locale, filename) : undefined,
    path.join(base, filename),
  ].filter(Boolean) as string[];
  for (const p of candidates) {
    if (fs.existsSync(path.join(process.cwd(), p))) return p;
  }
  return path.join(base, filename);
}

export function getMainNav(locale?: string): NavItem[] {
  return readJson<NavItem[]>(dataPathFor(locale, "mainnav.json"));
}

export function getBanners(locale?: string): Banner[] {
  return readJson<Banner[]>(dataPathFor(locale, "banners.json"));
}

export function getPromos(locale?: string): Promo[] {
  return readJson<Promo[]>(dataPathFor(locale, "promos.json"));
}

export function getFloors(locale?: string): Floor[] {
  return readJson<Floor[]>(dataPathFor(locale, "products.json"));
}

export function getServices(locale?: string): ServiceLink[] {
  return readJson<ServiceLink[]>(dataPathFor(locale, "services.json"));
}

export function getFloorBySlug(slug: string, locale?: string): Floor | undefined {
  const floors = getFloors(locale);
  // 允许 id 带前缀，如 floor-phone，对应 slug phone
  return floors.find((f) => f.id === slug || f.id === `floor-${slug}`);
}

export function getProductById(id: string, locale?: string) {
  const floors = getFloors(locale);
  for (const f of floors) {
    const p = f.products.find((x) => x.id === id);
    if (p) return { product: p, floor: f } as const;
  }
  return undefined;
}

export interface AboutData {
  banners: { id: string; title: string; image: string; href?: string }[];
  intro: { title: string; content: string };
}

export function getAbout(locale?: string): AboutData {
  return readJson<AboutData>(dataPathFor(locale, "about.json"));
}