import { describe, expect, test } from 'bun:test';
import {
  bytesBin,
  laneCountBin,
  peerHash,
  safeAttribute,
  UnsafeAttributeError,
} from '../src/index.ts';

describe('peerHash', () => {
  test('produces stable 8-char hex', () => {
    const a = peerHash('alice@example.com');
    const b = peerHash('alice@example.com');
    expect(a).toBe(b);
    expect(a).toMatch(/^[0-9a-f]{8}$/);
  });

  test('different addresses produce different hashes', () => {
    expect(peerHash('alice@example.com')).not.toBe(peerHash('bob@example.com'));
  });

  test('never echoes the address', () => {
    const addr = 'alice@example.com';
    expect(peerHash(addr).includes('alice')).toBe(false);
    expect(peerHash(addr).includes('@')).toBe(false);
  });
});

describe('bytesBin', () => {
  test('bins by order of magnitude', () => {
    expect(bytesBin(0)).toBe('≤4KB');
    expect(bytesBin(4096)).toBe('≤4KB');
    expect(bytesBin(4097)).toBe('4–64KB');
    expect(bytesBin(64 * 1024)).toBe('4–64KB');
    expect(bytesBin(64 * 1024 + 1)).toBe('64KB–1MB');
    expect(bytesBin(1024 * 1024)).toBe('64KB–1MB');
    expect(bytesBin(10 * 1024 * 1024)).toBe('1–10MB');
    expect(bytesBin(100 * 1024 * 1024)).toBe('10–100MB');
    expect(bytesBin(1024 * 1024 * 1024)).toBe('100MB–1GB');
    expect(bytesBin(2 * 1024 * 1024 * 1024)).toBe('≥1GB');
  });

  test('handles invalid input', () => {
    expect(bytesBin(-1)).toBe('unknown');
    expect(bytesBin(NaN)).toBe('unknown');
    expect(bytesBin(Infinity)).toBe('unknown');
  });
});

describe('laneCountBin', () => {
  test('snaps to {1, 4, 16, 64}', () => {
    expect(laneCountBin(1)).toBe(1);
    expect(laneCountBin(2)).toBe(4);
    expect(laneCountBin(4)).toBe(4);
    expect(laneCountBin(5)).toBe(16);
    expect(laneCountBin(16)).toBe(16);
    expect(laneCountBin(32)).toBe(64);
    expect(laneCountBin(128)).toBe(64);
  });
});

describe('safeAttribute', () => {
  test('rejects PII-flavoured keys', () => {
    expect(() => safeAttribute('shade.peer.address', 'x')).toThrow(UnsafeAttributeError);
    expect(() => safeAttribute('shade.bytes.exact', 1)).toThrow(UnsafeAttributeError);
    expect(() => safeAttribute('shade.plaintext', 'x')).toThrow(UnsafeAttributeError);
  });

  test('rejects address-like values', () => {
    expect(() => safeAttribute('custom.tag', 'alice@example.com')).toThrow(UnsafeAttributeError);
    expect(() => safeAttribute('custom.tag', 'device:abc-123')).toThrow(UnsafeAttributeError);
    expect(() => safeAttribute('custom.tag', 'did:web:example.com')).toThrow(UnsafeAttributeError);
  });

  test('rejects oversized strings', () => {
    expect(() => safeAttribute('ok', 'x'.repeat(257))).toThrow(UnsafeAttributeError);
  });

  test('accepts safe values', () => {
    expect(safeAttribute('shade.bytes.bin', '4–64KB')).toEqual({
      key: 'shade.bytes.bin',
      value: '4–64KB',
    });
    expect(safeAttribute('shade.lane.count', 4)).toEqual({ key: 'shade.lane.count', value: 4 });
    expect(safeAttribute('shade.retry.count', 0)).toEqual({ key: 'shade.retry.count', value: 0 });
    expect(safeAttribute('shade.error.code', 'SHADE_TIMEOUT')).toEqual({
      key: 'shade.error.code',
      value: 'SHADE_TIMEOUT',
    });
    // hashes pass through
    expect(safeAttribute('shade.peer.hash', 'abcdef01')).toEqual({
      key: 'shade.peer.hash',
      value: 'abcdef01',
    });
  });
});
