import type { NextConfig } from "next";

/** 由 scripts/build-safe.cjs 设置；在 VPS 上也可手动 export 后执行 pnpm build */
const lowMemBuild = process.env.NEXT_BUILD_LOW_MEM === "1";

const nextConfig: NextConfig = {
  experimental: {
    serverActions: { bodySizeLimit: "25mb" },
    ...(lowMemBuild
      ? {
          // 限制并行与预渲染并发，降低峰值内存（Next 16 默认 Turbopack 构建）
          cpus: 1,
          turbopackMemoryLimit: 1536 * 1024 * 1024,
          staticGenerationMaxConcurrency: 1,
          webpackMemoryOptimizations: true,
          parallelServerCompiles: false,
          parallelServerBuildTraces: false,
        }
      : {}),
  },
  async headers() {
    const noCacheHeaders = [
      {
        key: "Cache-Control",
        value: "no-store, no-cache, must-revalidate, proxy-revalidate",
      },
      { key: "Pragma", value: "no-cache" },
      { key: "Expires", value: "0" },
    ];
    return [
      { source: "/", headers: noCacheHeaders },
      {
        // 排除 /_next/ 静态资源（含 hash 可长期缓存），其余页面禁用缓存
        source: "/:path((?!_next).*)",
        headers: noCacheHeaders,
      },
    ];
  },
};

export default nextConfig;