import { INestApplication } from "@nestjs/common";
import { afterAll, beforeAll, describe, expect, it } from "vitest";
import {
  agent,
  bearer,
  closeTestApp,
  createTestApp,
  login,
  loginSuperAdmin,
  qaEmail,
  qaKey,
  type AuthedTokens,
} from "./setup.js";

/**
 * Protects the role-weight invariant of apps/api/src/auth/role-weight.ts
 * (docs/adr/0004-permission-model.md, eden.md §1.6): an actor can never
 * assign/act on a role heavier than their own. Two distinct regressions
 * are guarded here:
 *
 *  (a) an unknown role_key must fail as a clean 400, not an unhandled
 *      DB FK-constraint 500 — see role-weight.ts's own comment on this
 *      exact bug ("this function must be the single place that turns
 *      'role doesn't exist' into a clean 400, not the DB constraint").
 *  (b) the weight comparison itself: a low-weight actor must be
 *      forbidden (403) from assigning a heavier role than their own,
 *      even when they otherwise hold the users:edit permission needed to
 *      reach the check at all.
 */
describe("role-weight — assignment invariant", () => {
  let app: INestApplication;
  let admin: AuthedTokens;

  beforeAll(async () => {
    app = await createTestApp();
    admin = await loginSuperAdmin(app);
  });

  afterAll(async () => {
    await closeTestApp(app);
  });

  it("inviting a user with a role_key that doesn't exist returns 400, not 500 (regression guard)", async () => {
    const email = qaEmail("role-badkey");
    const res = await agent(app)
      .post("/api/v1/users/invite")
      .set(...bearer(admin.accessToken))
      .send({ email, roleKey: "does_not_exist_role_xyz" })
      .expect(400);
    expect(res.body.message).toContain("does_not_exist_role_xyz");

    // The invite must have been rejected before any row was written —
    // confirm no user with this email exists.
    const list = await agent(app)
      .get("/api/v1/users")
      .set(...bearer(admin.accessToken))
      .expect(200);
    expect(list.body.some((u: { email: string }) => u.email === email.toLowerCase())).toBe(false);
  });

  describe("a lower-weight actor cannot assign a heavier role", () => {
    let lowRoleKey: string;
    let lowActorUserId: string;
    let lowActorEmail: string;
    let lowActorPassword: string;
    let lowActorTokens: AuthedTokens;

    beforeAll(async () => {
      // 1. A fresh, low-weight role (weight 5 — lighter than every
      // system role except none; lighter than 'admin' at 80), granted
      // users:edit/all so the actor reaches the role-weight check itself
      // rather than being stopped earlier by PermissionGuard — isolating
      // the specific invariant under test.
      lowRoleKey = qaKey("lowrole");
      await agent(app)
        .post("/api/v1/roles")
        .set(...bearer(admin.accessToken))
        .send({ key: lowRoleKey, label: "QA test low-weight role", weight: 5 })
        .expect(201);
      await agent(app)
        .patch(`/api/v1/roles/${lowRoleKey}/permissions`)
        .set(...bearer(admin.accessToken))
        .send({ permissions: [{ resource: "users", action: "edit", scope: "all" }] })
        .expect(200);

      // 2. A throwaway user in that role, logged in for real.
      lowActorEmail = qaEmail("role-lowactor");
      const invite = await agent(app)
        .post("/api/v1/users/invite")
        .set(...bearer(admin.accessToken))
        .send({ email: lowActorEmail, roleKey: lowRoleKey, applications: ["core"] })
        .expect(201);
      lowActorUserId = invite.body.user.id;
      lowActorPassword = invite.body.tempPassword;
      lowActorTokens = await login(app, lowActorEmail, lowActorPassword);
    });

    afterAll(async () => {
      // Reassign the fixture user back to a system role and deactivate it
      // so the throwaway role has zero referencing users left, then
      // delete the throwaway role (RolesService.delete refuses to delete
      // a role that still has users on it) — full cleanup, not just a
      // tag, since both a DELETE-role and a PATCH-user endpoint exist.
      await agent(app)
        .patch(`/api/v1/users/${lowActorUserId}`)
        .set(...bearer(admin.accessToken))
        .send({ roleKey: "user", isActive: false })
        .expect(200);
      await agent(app)
        .delete(`/api/v1/roles/${lowRoleKey}`)
        .set(...bearer(admin.accessToken))
        .expect(204);
    });

    it("holding users:edit is not enough — assigning role 'admin' (weight 80 > actor's 5) is forbidden", async () => {
      const res = await agent(app)
        .post("/api/v1/users/invite")
        .set(...bearer(lowActorTokens.accessToken))
        .send({ email: qaEmail("role-target"), roleKey: "admin" })
        .expect(403);
      expect(res.body.message).toMatch(/peso maior/i);
    });
  });
});