import { mkdtempSync } from "node:fs";
import { tmpdir } from "node:os";
import { join, resolve } from "node:path";
import type { AppConfig, JobQueue, ServerContext } from "@stc/contracts";
import { createApp } from "@stc/core";
import { createCourseRepository } from "@stc/course-format";
import type { Db } from "@stc/db";
import { learnerFeature } from "../src/server/feature";

export const FIXTURES = resolve(import.meta.dir, "../../../fixtures/courses");
export const ORIGIN = "http://localhost:3000";

const fakeJobs: JobQueue = { enqueue: async () => "j", get: async () => null, list: async () => [] };

export async function makeApp(db: Db, courseDirs: string[] = [FIXTURES]) {
  const config: AppConfig = {
    port: 0, databaseUrl: "", dataDir: mkdtempSync(join(tmpdir(), "stc-learner-")), courseDirs,
    secret: "test-secret-0123456789abcdef0123456789", publicUrl: ORIGIN,
  };
  const ctx: ServerContext = {
    config, db, courses: await createCourseRepository(courseDirs), jobs: fakeJobs,
    auth: { userFromRequest: async () => null },
  };
  const feature = learnerFeature(ctx);
  ctx.auth = feature.auth;
  const app = createApp(ctx, [feature]);

  async function call(method: string, path: string, opts: { body?: unknown; cookie?: string; headers?: Record<string, string> } = {}) {
    const headers: Record<string, string> = { origin: ORIGIN, ...opts.headers };
    if (opts.cookie) headers.cookie = opts.cookie;
    let body: BodyInit | undefined;
    if (opts.body !== undefined) { headers["content-type"] = "application/json"; body = JSON.stringify(opts.body); }
    return app.fetch(new Request(ORIGIN + path, { method, headers, body }));
  }

  /** Signs up and returns a cookie header for the new session. */
  async function signUp(email: string, name = email.split("@")[0]!, password = "correct horse battery") {
    const r = await call("POST", "/api/auth/sign-up/email", { body: { email, name, password } });
    if (r.status !== 200) throw new Error(`sign-up failed ${r.status}: ${await r.text()}`);
    return cookieFrom(r);
  }

  return { app, ctx, feature, call, signUp };
}

export function cookieFrom(r: Response): string {
  return r.headers.getSetCookie().map((c) => c.split(";")[0]).filter((c) => !c.endsWith("=")).join("; ");
}