/**
 * 独立 tRPC HTTP 入口（`yarn dev:api`，默认 PORT=4000）。
 * web SSR 内嵌 `/api/trpc` 时通常不需要跑本文件。
 *
 * 注意：必须先副作用加载根 .env，再 import 会读 process.env 的模块（ESM 导入会提升）。
 */
import "./load-env.js";
import { createHTTPServer } from "@trpc/server/adapters/standalone";
import { appRouter } from "./router/index.js";
import { COOKIE_SESSION } from "@app/types";

const port = Number(process.env["PORT"] ?? 4000);

function parseCookies(header: string | null): Record<string, string> {
    const out: Record<string, string> = {};
    if (!header) return out;
    for (const part of header.split(";")) {
        const eq = part.indexOf("=");
        if (eq < 0) continue;
        const key = part.slice(0, eq).trim();
        const val = part.slice(eq + 1).trim();
        if (key) out[key] = decodeURIComponent(val);
    }
    return out;
}

const server = createHTTPServer({
    router: appRouter,
    createContext: ({ req }) => {
        const cookies = parseCookies(req.headers.cookie ?? null);
        const setCookies: string[] = [];
        // standalone 适配器不易注入响应头；session cookie 以内嵌 /api/trpc 为准
        void setCookies;
        return {
            sessionToken: cookies[COOKIE_SESSION],
            setCookie: (value: string) => {
                setCookies.push(value);
            },
        };
    },
});

server.listen(port, () => {
    console.log(`[trpc] listening on http://localhost:${port}`);
});