import { describe, it, expect } from 'vitest'
import { DraftReconciliationError, isDraftReconciliationError } from '../../src/automerge-markdown/errors'

describe('DraftReconciliationError', () => {
  it('constructs with default empty issues', () => {
    const err = new DraftReconciliationError('native-invariant', 'boom')
    expect(err.message).toBe('boom')
    expect(err.name).toBe('DraftReconciliationError')
    expect(err.reason).toBe('native-invariant')
    expect(err.issues).toEqual([])
  })

  it('constructs with provided issues', () => {
    const issues = [{ kind: 'unsupported' as const, message: 'bad intent' }]
    const err = new DraftReconciliationError('schema', 'failed', issues)
    expect(err.reason).toBe('schema')
    expect(err.issues).toBe(issues)
  })

  it('is identified by isDraftReconciliationError', () => {
    const err = new DraftReconciliationError('core-spec', 'boom')
    expect(isDraftReconciliationError(err)).toBe(true)
  })

  it('isDraftReconciliationError returns false for regular Error', () => {
    expect(isDraftReconciliationError(new Error('plain'))).toBe(false)
  })

  it('isDraftReconciliationError returns false for non-error values', () => {
    expect(isDraftReconciliationError(null)).toBe(false)
    expect(isDraftReconciliationError('string')).toBe(false)
    expect(isDraftReconciliationError(undefined)).toBe(false)
  })
})