import { expect, test } from "bun:test";
import { cpSync, mkdirSync, mkdtempSync, symlinkSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join, resolve } from "node:path";
import type { AuthUser, Feature, ServerContext } from "@stc/contracts";
import { createCourseRepository } from "@stc/course-format";
import { connect, migrate } from "@stc/db";
import { canView, createApp } from "../src";

const SAMPLE = resolve(import.meta.dir, "../../../fixtures/courses/sample");

async function setup(user: AuthUser | null = null) {
  const dir = mkdtempSync(join(tmpdir(), "stc-app-"));
  cpSync(SAMPLE, join(dir, "pub"), { recursive: true });
  const manifest = await Bun.file(join(SAMPLE, "stcourse.yaml")).text();
  mkdirSync(join(dir, "priv"));
  cpSync(SAMPLE, join(dir, "priv"), { recursive: true });
  writeFileSync(join(dir, "priv/stcourse.yaml"), manifest.replace("id: sample", "id: secret").replace("visibility: public", "visibility: restricted"));
  mkdirSync(join(dir, "broken"));
  writeFileSync(join(dir, "broken/stcourse.yaml"), "schema: 1\nid: broken\ntitle: Broken\nroot: /does/not/exist\nmodules: []\n");
  symlinkSync("/etc", join(dir, "pub/escape"));
  const db = await connect("sqlite://:memory:");
  await migrate(db);
  const courses = await createCourseRepository([dir]);
  const ctx = { db, courses, auth: { userFromRequest: async () => user } } as unknown as ServerContext;
  return { ctx, db, dir };
}
const feat = (name: string): Feature => ({ name, routes: { "/api/x": { GET: () => new Response(name) } } });
const user = (over: Partial<AuthUser> = {}): AuthUser => ({ id: "u1", email: "u@x", name: "U", roles: ["learner"], groups: [], ...over });

test("health ok, and an error course does not break it", async () => {
  const { ctx, db } = await setup();
  expect(ctx.courses.get("broken")?.status).toBe("error");
  const app = createApp(ctx, []);
  const r = await app.fetch(new Request("http://x/api/health"));
  expect(r.status).toBe(200);
  expect(await r.json()).toEqual({ ok: true, courses: ctx.courses.list().length, db: "sqlite" });
  expect(ctx.courses.list().length).toBe(3);
  await db.close();
});

test("media serves a file with Range, and a missing/broken course is 404", async () => {
  const { ctx, db } = await setup();
  const app = createApp(ctx, []);
  const r = await app.fetch(new Request("http://x/api/media/sample/media/clip.mp4", { headers: { Range: "bytes=0-9" } }));
  expect(r.status).toBe(206);
  expect((await app.fetch(new Request("http://x/api/media/broken/anything"))).status).toBe(404);
  expect((await app.fetch(new Request("http://x/api/media/nope/a"))).status).toBe(404);
  await db.close();
});

test("traversal, absolute and symlink escapes are 404", async () => {
  const { ctx, db } = await setup();
  const app = createApp(ctx, []);
  for (const p of ["..%2F..%2Fetc%2Fpasswd", "%2Fetc%2Fpasswd", "escape/passwd", "../priv/stcourse.yaml", "%E0%A4%A"]) {
    const r = await app.fetch(new Request(`http://x/api/media/sample/${p}`));
    expect(r.status).toBe(404);
  }
  await db.close();
});

test("restricted course: 404 anonymous, visible to owner, author, ACL user and group", async () => {
  const url = "http://x/api/media/secret/media/clip.mp4";
  const run = async (u: AuthUser | null, seed?: (db: Awaited<ReturnType<typeof setup>>["db"]) => Promise<unknown>) => {
    const { ctx, db } = await setup(u);
    await seed?.(db);
    const s = (await createApp(ctx, []).fetch(new Request(url))).status;
    await db.close();
    return s;
  };
  expect(await run(null)).toBe(404);
  expect(await run(user())).toBe(404);
  expect(await run(user({ roles: ["owner"] }))).toBe(200);
  expect(await run(user(), (db) => db.sql`INSERT INTO course_authors (course_id, user_id) VALUES ('secret', 'u1')`)).toBe(200);
  expect(await run(user(), (db) => db.sql`INSERT INTO course_acl VALUES ('secret', 'user', 'u1')`)).toBe(200);
  expect(await run(user({ groups: ["g"] }), (db) => db.sql`INSERT INTO course_acl VALUES ('secret', 'group', 'g')`)).toBe(200);
  expect(await run(user({ groups: ["h"] }), (db) => db.sql`INSERT INTO course_acl VALUES ('secret', 'group', 'g')`)).toBe(404);
});

test("duplicate method+path across features throws", async () => {
  const { ctx, db } = await setup();
  expect(() => createApp(ctx, [feat("a"), feat("b")])).toThrow(/Duplicate route GET \/api\/x/);
  await db.close();
});

test("feature routes receive RequestContext with the user", async () => {
  const u = user();
  const { ctx, db } = await setup(u);
  const f: Feature = { name: "a", routes: { "/api/who/:id": { GET: (_r, rc) => Response.json({ u: rc.user?.id, id: rc.params.id }) } } };
  const app = createApp(ctx, [f]);
  expect(await (await app.fetch(new Request("http://x/api/who/42"))).json()).toEqual({ u: "u1", id: "42" });
  await db.close();
});

test("canView matrix", async () => {
  const { ctx, db } = await setup();
  const pub = ctx.courses.get("sample")!, priv = ctx.courses.get("secret")!;
  expect(canView(null, pub, [])).toBe(true);
  expect(canView(null, priv, [])).toBe(false);
  await db.close();
});