import { readFile } from "node:fs/promises";

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

import { hasAdminSessionAccess, hasSuperAdminAccess } from "@/lib/auth/permissions";
import type { AuthSession } from "@/lib/auth/session";

type FixtureCase = {
  name: string;
  state: { required: boolean; configured: boolean };
  requirement: "app" | "admin" | "super_admin";
  resolverOutcome: "not_called" | "unauthenticated" | "authenticated" | "infrastructure_error";
  session?: { authMode: "user" | "admin"; role: "user" | "organization_admin" | "super_admin" };
  expected: { outcome: string; status: number; role?: string; authMode?: string };
};

type Fixture = { version: 1; cookieName: string; cases: FixtureCase[] };

const fixtureUrl = new URL("../contracts/auth/platform-http-auth-v1.json", import.meta.url);

describe("platform HTTP authorization v1 contract", () => {
  it("freezes the current configuration fallback and error categories", async () => {
    const fixture = JSON.parse(await readFile(fixtureUrl, "utf8")) as Fixture;
    expect(fixture.version).toBe(1);
    expect(fixture.cookieName).toBe("zhinian_session");

    for (const contractCase of fixture.cases) {
      expect(evaluateConfiguration(contractCase), contractCase.name).toEqual(contractCase.expected);
    }
  });

  it("uses the current role and auth-mode permission helpers", async () => {
    const fixture = JSON.parse(await readFile(fixtureUrl, "utf8")) as Fixture;
    for (const contractCase of fixture.cases.filter((item) => item.session)) {
      const session = fixtureSession(contractCase.session!);
      const allowed = contractCase.requirement === "app"
        ? true
        : contractCase.requirement === "admin"
          ? hasAdminSessionAccess(session)
          : hasSuperAdminAccess(session.user);
      expect(allowed, contractCase.name).toBe(contractCase.expected.outcome === "authenticated");
    }
  });
});

function evaluateConfiguration(contractCase: FixtureCase): FixtureCase["expected"] {
  if (contractCase.resolverOutcome === "infrastructure_error") {
    return { outcome: "infrastructure_error", status: 500 };
  }
  if (contractCase.resolverOutcome === "authenticated") {
    const session = fixtureSession(contractCase.session!);
    const allowed = contractCase.requirement === "app"
      || (contractCase.requirement === "admin" && hasAdminSessionAccess(session))
      || (contractCase.requirement === "super_admin" && hasSuperAdminAccess(session.user));
    return allowed
      ? { outcome: "authenticated", status: 200, role: session.user.role, authMode: session.authMode }
      : { outcome: "forbidden", status: 403 };
  }
  if (!contractCase.state.required) {
    return { outcome: "authenticated", status: 200, role: "super_admin", authMode: "admin" };
  }
  if (!contractCase.state.configured) return { outcome: "configuration_error", status: 503 };
  return { outcome: "unauthenticated", status: 401 };
}

function fixtureSession(input: NonNullable<FixtureCase["session"]>): AuthSession {
  return {
    version: 1,
    authMode: input.authMode,
    issuedAt: 100,
    expiresAt: 200,
    user: {
      id: "fixture-user",
      subject: "fixture-user",
      displayName: "Fixture User",
      clientId: "platform",
      role: input.role,
      authorities: [],
      scope: [],
    },
  };
}