import { describe, expect, test } from 'bun:test';
import { arrayField, isoOrNull, toNode, toUser } from './normalize';

// Headscale's REST layer is a gRPC gateway marshalling protobuf, and it leaks in three specific ways.
// These transforms are where that leak is contained, so they are the file most likely to be quietly wrong
// after an upstream release — and they had no tests at all.

describe('isoOrNull', () => {
  test("the protobuf zero timestamp means 'never', not the year 1", () => {
    // The leak that matters most: unset timestamps arrive as this literal rather than being omitted.
    // Rendered naively a node's expiry reads as year 1, which looks like an expired node rather than one
    // that never expires.
    expect(isoOrNull('0001-01-01T00:00:00Z')).toBeNull();
  });

  test('pre-1971 is treated as the sentinel too, for builds that emit a different zero', () => {
    expect(isoOrNull('1970-01-01T00:00:00Z')).toBeNull();
    expect(isoOrNull('1960-06-01T00:00:00Z')).toBeNull();
  });

  test('a real timestamp survives, normalised to ISO', () => {
    expect(isoOrNull('2026-08-15T10:30:00Z')).toBe('2026-08-15T10:30:00.000Z');
  });

  test('anything that is not a usable string is null rather than a crash', () => {
    // EmitUnpopulated means absent messages arrive as null, so these are normal input, not corruption.
    for (const bad of [null, undefined, '', 'not a date', 42, {}, []]) {
      expect(isoOrNull(bad)).toBeNull();
    }
  });
});

describe('toNode', () => {
  test('ids stay STRINGS — never numbers', () => {
    // Headscale ids are uint64 serialized as JSON strings. Number() breaks silently above 2^53, and the
    // ids are database-assigned rather than small by contract, so this is a real ceiling and not theory.
    const node = toNode({ id: '9007199254740993', name: 'a' });
    expect(node.id).toBe('9007199254740993');
    expect(typeof node.id).toBe('string');
  });

  test('givenName wins over name, falling back when it is unset', () => {
    expect(toNode({ id: '1', givenName: 'laptop', name: 'laptop.tail1234.ts.net' }).name).toBe('laptop');
    expect(toNode({ id: '1', name: 'laptop.tail1234.ts.net' }).name).toBe('laptop.tail1234.ts.net');
  });

  test('an exit node is recognised from either default route', () => {
    expect(toNode({ id: '1', availableRoutes: ['0.0.0.0/0'] }).isExitNode).toBe(true);
    expect(toNode({ id: '1', availableRoutes: ['::/0'] }).isExitNode).toBe(true);
    expect(toNode({ id: '1', availableRoutes: ['10.0.0.0/24'] }).isExitNode).toBe(false);
    expect(toNode({ id: '1' }).isExitNode).toBe(false);
  });

  test('an unknown register method degrades rather than leaking the enum', () => {
    expect(toNode({ id: '1', registerMethod: 'REGISTER_METHOD_AUTH_KEY' }).registerMethod).toBe('authkey');
    // A method added in a future release must not put REGISTER_METHOD_SOMETHING_NEW in the UI.
    expect(toNode({ id: '1', registerMethod: 'REGISTER_METHOD_FUTURE' }).registerMethod).toBe('unknown');
    expect(toNode({ id: '1' }).registerMethod).toBe('unknown');
  });

  test('online is strictly true, so a missing field is offline rather than truthy', () => {
    expect(toNode({ id: '1', online: true }).online).toBe(true);
    expect(toNode({ id: '1', online: 'true' }).online).toBe(false);
    expect(toNode({ id: '1' }).online).toBe(false);
  });

  test('a node with nothing but an id normalises instead of throwing', () => {
    // EmitUnpopulated guarantees absent repeated fields arrive as [] and absent messages as null, and
    // there is no way to tell "unset" from "empty" — so every accessor has to tolerate both.
    const node = toNode({ id: '7' });
    expect(node.ipAddresses).toEqual([]);
    expect(node.tags).toEqual([]);
    expect(node.user).toBeNull();
    expect(node.lastSeen).toBeNull();
  });

  test('non-string entries are dropped from string arrays rather than rendered', () => {
    expect(toNode({ id: '1', ipAddresses: ['100.64.0.1', null, 42, '::1'] }).ipAddresses).toEqual([
      '100.64.0.1',
      '::1',
    ]);
  });
});

describe('toUser', () => {
  test('null and undefined pass through as null', () => {
    expect(toUser(null)).toBeNull();
    expect(toUser(undefined)).toBeNull();
  });
});

describe('arrayField', () => {
  test('pulls the named array, keeping only objects', () => {
    expect(arrayField({ nodes: [{ id: '1' }, null, 'x', { id: '2' }] }, 'nodes')).toEqual([{ id: '1' }, { id: '2' }]);
  });

  test('a missing field or a non-array body is an empty list, not a throw', () => {
    expect(arrayField({}, 'nodes')).toEqual([]);
    expect(arrayField(null, 'nodes')).toEqual([]);
    expect(arrayField({ nodes: 'not-an-array' }, 'nodes')).toEqual([]);
  });
});