import { getPayload, Payload } from "payload";
import type { Access } from "payload";
import config from "@/payload.config";

import { afterAll, beforeAll, describe, expect, it } from "vitest";

import type { Role, User } from "@/payload-types";
import { requireAdminPageAccess } from "@/utils/access-control/hasPermission";
import { invalidatePermissionCache } from "@/utils/access-control/loadUserPermissions";

let payload: Payload;

const RUN = `adm-${Date.now().toString(36)}`;
const TIMEOUT = 30_000;

describe("Scoped admin page access control", () => {
  const roleIds: number[] = [];
  const userIds: number[] = [];

  let readOnlyUser: User;
  let manageOnlyUser: User;
  let bothUser: User;
  let devUser: User;
  let neitherUser: User;

  const makeRole = async (label: string, extra: Partial<Role> = {}): Promise<Role> => {
    const role = (await payload.create({
      collection: "roles",
      data: { name: `${RUN}-${label}`, slug: `${RUN}-${label}`, ...extra },
      overrideAccess: true,
      depth: 0,
    })) as unknown as Role;
    roleIds.push(role.id);
    return role;
  };

  const makeUser = async (label: string, roleId: number): Promise<User> => {
    const user = (await payload.create({
      collection: "users",
      data: {
        username: `${RUN}-${label}`,
        discordUsername: `${RUN}-${label}`,
        displayName: label.toUpperCase(),
        steamId: `7656119${Math.floor(Math.random() * 1e9)}`,
        password: "Test123",
        // Permission resolution reads roleDocs (the dynamic RBAC relationship), not
        // the legacy `roles` enum — so assign a real role doc to grant permissions.
        roleDocs: [roleId],
      },
      overrideAccess: true,
      depth: 0,
    })) as unknown as User;
    userIds.push(user.id);
    return user;
  };

  // Invoke the admin-page wrapper exactly as Payload would for an admin-panel
  // request (pathname under /admin). The vitest environment has no Next.js HTTP
  // server, so calling the access function directly is the standard way to unit-test
  // Payload access control.
  const adminDecision = async (user: User | null): Promise<unknown> => {
    const fn = requireAdminPageAccess("missions");
    return await (fn as (args: { req: unknown }) => Promise<unknown>)({
      req: { user, payload, pathname: "/admin/collections/missions" },
    });
  };

  // Same wrapper, but on a REST API pathname — the original read access must be
  // preserved unchanged outside the admin panel.
  const apiDecision = async (user: User | null, readAccess?: Access | boolean): Promise<unknown> => {
    const fn = requireAdminPageAccess("missions", readAccess);
    return await (fn as (args: { req: unknown }) => Promise<unknown>)({
      req: { user, payload, pathname: "/api/missions" },
    });
  };

  beforeAll(async () => {
    const payloadConfig = await config;
    payload = await getPayload({ config: payloadConfig });
    invalidatePermissionCache();

    const readOnlyRole = await makeRole("readonly", { permissions: ["missions:read"] });
    const manageOnlyRole = await makeRole("manageonly", {
      permissions: ["admin:missions:manage"],
    });
    const bothRole = await makeRole("both", {
      permissions: ["missions:read", "admin:missions:manage"],
    });
    const devRole = await makeRole("dev", { isSuperuser: true });
    const neitherRole = await makeRole("neither", { permissions: [] });

    readOnlyUser = await makeUser("readonly", readOnlyRole.id);
    manageOnlyUser = await makeUser("manageonly", manageOnlyRole.id);
    bothUser = await makeUser("both", bothRole.id);
    devUser = await makeUser("dev", devRole.id);
    neitherUser = await makeUser("neither", neitherRole.id);
  }, TIMEOUT);

  afterAll(async () => {
    if (!payload) return;
    for (const id of userIds) {
      const profiles = await payload
        .find({
          collection: "profiles",
          where: { user: { equals: id } },
          limit: 5,
          depth: 0,
          overrideAccess: true,
        })
        .catch(() => null);
      for (const p of profiles?.docs ?? []) {
        await Promise.allSettled([
          payload.delete({ collection: "profiles", id: p.id, overrideAccess: true }),
        ]);
      }
      await Promise.allSettled([payload.delete({ collection: "users", id, overrideAccess: true })]);
    }
    for (const id of roleIds) {
      await Promise.allSettled([payload.delete({ collection: "roles", id, overrideAccess: true })]);
    }
  });

  it("denies admin access with only the collection read permission", async () => {
    expect(await adminDecision(readOnlyUser)).toBe(false);
  }, TIMEOUT);

  it("denies admin access with only the admin page-manage permission", async () => {
    expect(await adminDecision(manageOnlyUser)).toBe(false);
  }, TIMEOUT);

  it("grants admin access with both permissions", async () => {
    expect(await adminDecision(bothUser)).toBe(true);
  }, TIMEOUT);

  it("grants admin access to superuser roles", async () => {
    expect(await adminDecision(devUser)).toBe(true);
  }, TIMEOUT);

  it("denies admin access with neither permission", async () => {
    expect(await adminDecision(neitherUser)).toBe(false);
  }, TIMEOUT);

  it("denies anonymous admin access", async () => {
    expect(await adminDecision(null)).toBe(false);
  }, TIMEOUT);

  it("preserves the default logged-in read on the API path", async () => {
    expect(await apiDecision(bothUser)).toBe(true);
  }, TIMEOUT);

  it("preserves the default anonymous denial on the API path", async () => {
    expect(await apiDecision(null)).toBe(false);
  }, TIMEOUT);

  it("delegates a Where-returning original access on the API path", async () => {
    const where = { user: { equals: bothUser.id } };
    expect(await apiDecision(bothUser, () => where)).toEqual(where);
  }, TIMEOUT);

  it("delegates a boolean original access on the API path", async () => {
    expect(await apiDecision(bothUser, () => false)).toBe(false);
    expect(await apiDecision(bothUser, () => true)).toBe(true);
  }, TIMEOUT);
});