import { test, expect } from "vitest";
import Fastify from "fastify";
import { authPreHandler, getPrincipal } from "../src/auth/auth.js";
import { chmodSync, mkdtempSync, readFileSync, rmSync, statSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { expandLocalHome, localPrincipal, upstreamPrincipal } from "../src/auth/principal.js";

test("server smoke trusted claims transform through nginx to a non-admin principal", () => {
  const smoke = readFileSync("../scripts/unified-deployment-smoke.sh", "utf8");
  const nginx = readFileSync("../docker/nginx.conf.template", "utf8");
  const helper = smoke.match(/task13_server_auth_headers\(\) \{([\s\S]*?)\n\}/)?.[1] ?? "";
  const trusted = Object.fromEntries(
    [...helper.matchAll(/-H '([^:']+): ([^']+)'/g)].map((match) => [match[1].toLowerCase(), match[2]]),
  );
  const normalized: Record<string, string> = {};
  for (const [header, suffix] of [
    ["x-thoth-principal-issuer", "principal_issuer"],
    ["x-thoth-principal-subject", "principal_subject"],
    ["x-thoth-principal-display-name", "principal_display_name"],
    ["x-thoth-is-admin", "is_admin"],
  ]) {
    expect(nginx).toContain(`$http_x_thoth_trusted_${suffix}`);
    const value = trusted[`x-thoth-trusted-${header.slice("x-thoth-".length)}`];
    if (value !== undefined) normalized[header] = value;
  }

  expect(upstreamPrincipal(normalized)).toEqual({
    issuer: "task13-proxy",
    subject: "task13-user",
    displayName: "Task 13 User",
    roles: ["user"],
    permissions: ["session.use"],
    isAdmin: false,
  });
});

test("local mode resolves a stable local principal", async () => {
  const app = Fastify();
  app.addHook("preHandler", authPreHandler("none"));
  app.get("/me", async (req) => getPrincipal(req));
  expect((await app.inject({ method: "GET", url: "/me" })).json()).toMatchObject({
    issuer: "local",
    subject: expect.any(String),
    roles: ["admin"],
    permissions: [
      "session.use", "session.read_all", "session.manage_all", "settings.manage",
      "workspace.manage", "workspace.secrets.manage", "pi.manage", "auth.diagnostics.read",
    ],
    isAdmin: true,
  });
});

test("mock mode makes a principal from the test header", async () => {
  const app = Fastify();
  app.addHook("preHandler", authPreHandler("mock"));
  app.get("/me", async (req) => getPrincipal(req));
  const res = await app.inject({
    method: "GET",
    url: "/me",
    headers: { "x-mock-user": "alice" },
  });
  expect(res.json()).toEqual({
    issuer: "mock", subject: "alice", displayName: "alice",
    roles: ["user"], permissions: ["session.use"], isAdmin: false,
  });
});

test("upstream mode accepts only normalized proxy principal headers", async () => {
  const app = Fastify();
  app.addHook("preHandler", authPreHandler("upstream"));
  app.get("/me", async (req) => getPrincipal(req));

  expect((await app.inject({ method: "GET", url: "/me" })).statusCode).toBe(401);
  const authenticated = await app.inject({
    method: "GET",
    url: "/me",
    headers: {
      "x-thoth-principal-issuer": "portal",
      "x-thoth-principal-subject": "42",
      "x-thoth-principal-display-name": "Alice",
      "x-thoth-is-admin": "1",
      "x-authenticated-user": "must-not-be-used",
    },
  });
  expect(authenticated.json()).toEqual({
    issuer: "portal", subject: "42", displayName: "Alice", roles: ["user", "admin"],
    permissions: [
      "session.use", "session.read_all", "session.manage_all", "settings.manage",
      "workspace.manage", "workspace.secrets.manage", "pi.manage", "auth.diagnostics.read",
    ],
    isAdmin: true,
  });
});

test("upstream mode rejects legacy client identity headers without proxy principal fields", async () => {
  const app = Fastify();
  app.addHook("preHandler", authPreHandler("upstream"));
  app.get("/me", async (req) => getPrincipal(req));

  for (const headers of [
    { "x-authenticated-user": "mallory" },
    { "x-mock-user": "mallory" },
    { "x-authenticated-user": "mallory", "x-mock-user": "mallory" },
  ]) {
    expect((await app.inject({ method: "GET", url: "/me", headers })).statusCode).toBe(401);
  }
});

test("local identity expands tilde homes and restores private POSIX permissions", () => {
  expect(expandLocalHome("~/thoth-test", "/home/tester")).toBe("/home/tester/thoth-test");
  expect(expandLocalHome("~", "/home/tester")).toBe("/home/tester");
  const home = mkdtempSync(join(tmpdir(), "thoth-principal-"));
  chmodSync(home, 0o755);
  const previous = process.env.THT_HOME;
  process.env.THT_HOME = home;
  try {
    localPrincipal();
    if (process.platform !== "win32") {
      expect(statSync(home).mode & 0o777).toBe(0o700);
      expect(statSync(join(home, "identity.json")).mode & 0o777).toBe(0o600);
    }
  } finally {
    if (previous === undefined) delete process.env.THT_HOME; else process.env.THT_HOME = previous;
    rmSync(home, { recursive: true, force: true });
  }
});