// The receipt of a vote on the Ğ1 chain, checked in the browser: the same
// canonical text and the same seal as the engine (crates/ld-engine/src/ballot.rs,
// whose vectors were computed apart with Python's hashlib.blake2b).
import { describe, expect, it } from 'vitest';
import { canonical, checkReceipt, seal } from '../../src/lib/receipt';

const SALT = '00112233445566778899aabbccddeeff';
const LINES = [
  { proposalId: 'p2', revision: 1, choice: 'against' as const },
  { proposalId: 'p1', revision: 3, choice: 'for' as const },
];

describe('the sealed ballot', () => {
  it('reads as the engine writes it, the lines in the order of their versions', () => {
    expect(canonical('d0c', null, LINES, SALT)).toBe(
      'ld1\ndoc d0c\nauthor -\nline p1 3 for\nline p2 1 against\nsalt 00112233445566778899aabbccddeeff\n',
    );
  });

  it('seals to the remark of the engine', () => {
    const s = seal('d0c', null, LINES, SALT);
    expect(s?.digest).toBe('20448d496744292981c8586856afb58a86e37da2470f764b4e6ed84eade71340');
    expect(s?.comment).toBe('ld1:20448d496744292981c8586856afb58a86e37da2470f764b4e6ed84eade71340');
    expect(s?.remarkHash).toBe('0xe765221a75716dde863a7b53df3a97acf6db38a2118edd525d54c8a2979b7bc3');
    const bound = seal('d0c', 'g1NrqKgJW9FoFabaYW82zhS9tDWdQcL1DGpivaJdj7GW9M6iv', [{ proposalId: 'p1', revision: 3, choice: 'none' }], 'ffeeddccbbaa99887766554433221100');
    expect(bound?.digest).toBe('6a6d8a90b5003ff3c4d050dbd36199e8bbf34c4cc11620618399226c9237c05e');
    expect(bound?.remarkHash).toBe('0x846495fe62b9a5184a0d3090d4d26f621887c334890404169c00575ee74540e4');
  });

  it('what cannot be sealed', () => {
    expect(seal('d0c', null, [], SALT)).toBeNull();
    expect(seal('d0c', null, [LINES[0]!, { ...LINES[0]!, revision: 2 }], SALT)).toBeNull();
    expect(seal('d 0c', null, LINES, SALT)).toBeNull();
    expect(seal('d0c', null, LINES, SALT.toUpperCase())).toBeNull();
    expect(seal('d0c', null, LINES, '0011')).toBeNull();
    expect(seal('d0c', null, [{ proposalId: 'p1', revision: 1.5, choice: 'for' }], SALT)).toBeNull();
  });
});

describe('a receipt', () => {
  const receipt = {
    format: 'ld1',
    doc: 'd0c',
    author: null,
    lines: LINES.map((l) => ({ ...l, article: 'E1', title: 'Unicité du compte' })),
    salt: SALT,
    comment: 'ld1:20448d496744292981c8586856afb58a86e37da2470f764b4e6ed84eade71340',
    block: 3_400_000,
  };

  it('holds when its lines and its salt give its comment', () => {
    expect(checkReceipt(JSON.stringify(receipt))).toEqual({
      kind: 'ok',
      comment: receipt.comment,
      remarkHash: '0xe765221a75716dde863a7b53df3a97acf6db38a2118edd525d54c8a2979b7bc3',
      block: 3_400_000,
      lines: receipt.lines,
    });
  });

  it('does not hold once a choice is changed', () => {
    const changed = { ...receipt, lines: [{ ...receipt.lines[0]!, choice: 'for' }, receipt.lines[1]!] };
    const check = checkReceipt(JSON.stringify(changed));
    expect(check.kind).toBe('mismatch');
    if (check.kind === 'mismatch') expect(check.computed).not.toBe(receipt.comment);
  });

  it('what is not a receipt', () => {
    for (const text of ['', 'nope', '[]', '{}', JSON.stringify({ ...receipt, format: 'ld2' }), JSON.stringify({ ...receipt, lines: 'x' })]) {
      expect(checkReceipt(text).kind, text).toBe('unreadable');
    }
  });
});