import { test, expect, vi } from "vitest";
import Fastify from "fastify";
import { authenticateSession, 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";
import { buildApp } from "../src/app.js";
import { loadConfig } from "../src/config.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("buildApp exposes safe nullable session metadata for authenticated legacy modes", async () => {
  const configurations = [
    {
      name: "none",
      config: loadConfig({ NODE_ENV: "test", AUTH_MODE: "none", THT_HARNESS_DIR: "/tmp/h" }),
      headers: {},
      expected: { issuer: "local", roles: ["admin"] },
    },
    {
      name: "mock",
      config: loadConfig({ NODE_ENV: "test", AUTH_MODE: "mock", THT_HARNESS_DIR: "/tmp/h" }),
      headers: { "x-mock-user": "legacy-mock" },
      expected: { issuer: "mock", subject: "legacy-mock", roles: ["user"] },
    },
    {
      name: "upstream",
      config: loadConfig({ NODE_ENV: "production", AUTH_MODE: "upstream", THT_HARNESS_DIR: "/tmp/h" }),
      headers: {
        "x-thoth-principal-issuer": "portal",
        "x-thoth-principal-subject": "legacy-upstream",
        "x-thoth-is-admin": "0",
      },
      expected: { issuer: "portal", subject: "legacy-upstream", roles: ["user"] },
    },
  ];

  for (const legacy of configurations) {
    const app = buildApp(legacy.config, { thtRunner: {} as any, listModels: async () => [] });
    try {
      const response = await app.inject({ method: "GET", url: "/me", headers: legacy.headers });
      expect(response.statusCode, legacy.name).toBe(200);
      expect(response.json()).toMatchObject({
        ...legacy.expected,
        csrfToken: null,
        session: null,
      });
    } finally {
      await app.close();
    }
  }
});

test("the session boundary exposes only exact health and authentication protocol paths", async () => {
  const app = Fastify();
  app.addHook("preHandler", authenticateSession({
    mode: "local",
    authentication: {
      current: () => ({
        sourcePath: "/private/auth.yaml",
        revision: "a".repeat(64),
        value: {
          version: 1,
          mode: "local",
          publicUrl: "http://127.0.0.1:8787",
          session: {
            regularTtlSeconds: 43_200, regularIdleSeconds: 7_200,
            rememberTtlSeconds: 2_592_000, rememberIdleSeconds: 604_800, oidcTtlSeconds: 28_800,
          },
          local: { usersFile: "users.yaml" },
        },
      }),
    },
    sessionStore: { resolve: async () => undefined } as any,
  }));
  app.get("/health", async () => ({ ok: true }));
  app.get("/auth/config", async () => ({ mode: "local" }));
  app.get("/healthz", async () => ({ ok: true }));
  app.get("/auth/configured", async () => ({ mode: "local" }));

  expect((await app.inject({ method: "GET", url: "/health?probe=1" })).statusCode).toBe(200);
  expect((await app.inject({ method: "GET", url: "/auth/config?ui=1" })).statusCode).toBe(200);
  expect((await app.inject({ method: "GET", url: "/healthz" })).statusCode).toBe(401);
  expect((await app.inject({ method: "GET", url: "/auth/configured" })).statusCode).toBe(401);
});

test("the session boundary retains the exact loopback tht maintenance identity in configured auth modes", async () => {
  const app = Fastify();
  app.addHook("preHandler", authenticateSession({ mode: "local" }));
  app.get("/private", async (request) => getPrincipal(request));
  app.post("/private", async (request) => getPrincipal(request));
  const headers = {
    "x-thoth-principal-issuer": "tht",
    "x-thoth-principal-subject": "tht-maintenance",
    "x-thoth-principal-display-name": "Tht maintenance",
    "x-thoth-is-admin": "1",
  };

  for (const method of ["GET", "POST"] as const) {
    const response = await app.inject({ method, url: "/private", headers, remoteAddress: "127.0.0.1" });
    expect(response.statusCode).toBe(200);
    expect(response.json()).toMatchObject({ issuer: "tht", subject: "tht-maintenance", isAdmin: true });
  }
});

test("the session boundary rejects tht maintenance headers outside exact loopback provenance", async () => {
  const app = Fastify();
  app.addHook("preHandler", authenticateSession({ mode: "local" }));
  app.get("/private", async (request) => getPrincipal(request));
  const exact = {
    "x-thoth-principal-issuer": "tht",
    "x-thoth-principal-subject": "tht-maintenance",
    "x-thoth-principal-display-name": "Tht maintenance",
    "x-thoth-is-admin": "1",
  };

  expect((await app.inject({ method: "GET", url: "/private", headers: exact, remoteAddress: "172.30.0.9" })).statusCode).toBe(503);
  expect((await app.inject({
    method: "GET", url: "/private", remoteAddress: "127.0.0.1",
    headers: { ...exact, "x-thoth-principal-subject": "not-maintenance" },
  })).statusCode).toBe(503);
});

test("the session boundary touches a valid cookie session through the bounded Task 7 store operation", async () => {
  const sessions = {
    resolve: vi.fn(async () => ({
      version: 1,
      issuer: "local",
      subject: "user-1",
      method: "local",
      roles: ["user"],
      permissions: ["session.use"],
      userAuthRevision: 1,
      authConfigRevision: "b".repeat(64),
      remembered: false,
      createdAt: "2026-08-16T00:00:00.000Z",
      lastSeenAt: "2026-08-16T00:00:00.000Z",
      idleExpiresAt: "2026-08-16T02:00:00.000Z",
      absoluteExpiresAt: "2026-08-16T12:00:00.000Z",
    })),
    touch: vi.fn(async () => {}),
  };
  const app = Fastify();
  app.addHook("preHandler", authenticateSession({
    mode: "local",
    authentication: {
      current: () => ({
        sourcePath: "/private/auth.yaml",
        revision: "b".repeat(64),
        value: {
          version: 1,
          mode: "local",
          publicUrl: "http://127.0.0.1:8787",
          session: {
            regularTtlSeconds: 43_200, regularIdleSeconds: 7_200,
            rememberTtlSeconds: 2_592_000, rememberIdleSeconds: 604_800, oidcTtlSeconds: 28_800,
          },
          local: { usersFile: "users.yaml" },
        },
      }),
    },
    sessionStore: sessions as any,
  }));
  app.get("/private", async (request) => getPrincipal(request));

  const token = "z".repeat(43);
  expect((await app.inject({ method: "GET", url: "/private", headers: { cookie: `thothii_session=${token}` } })).statusCode).toBe(200);
  expect(sessions.touch).toHaveBeenCalledWith(token);
});

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 });
  }
});