import { describe, expect, it } from 'vitest'
import {
  classifyDisconnectReason,
  reconnectDelayMs,
  shouldAutoReconnect,
  shouldForgetNativeConnection,
} from '../../src/utils/disconnectReason'

describe('classifyDisconnectReason', () => {
  it('treats keepalive failure as a link drop that should reconnect', () => {
    expect(classifyDisconnectReason('keepalive failed')).toBe('keepalive')
    expect(shouldAutoReconnect('keepalive')).toBe(true)
  })

  it('does not treat the legacy native default as a user click', () => {
    expect(classifyDisconnectReason('closed by user')).toBe('unexpected')
    expect(classifyDisconnectReason('connection closed')).toBe('unexpected')
    expect(shouldAutoReconnect('unexpected')).toBe(true)
  })

  it('skips auto-reconnect for local policy and teardown', () => {
    expect(classifyDisconnectReason('idle suspend')).toBe('idle-suspend')
    expect(shouldAutoReconnect('idle-suspend')).toBe(false)
    expect(shouldForgetNativeConnection('idle-suspend')).toBe(false)

    expect(classifyDisconnectReason('manual')).toBe('user')
    expect(classifyDisconnectReason('no refs')).toBe('user')
    expect(classifyDisconnectReason('auto reconnect cleanup')).toBe('cleanup')
    expect(shouldAutoReconnect('user')).toBe(false)
    expect(shouldAutoReconnect('cleanup')).toBe(false)
  })

  it('backs off reconnect delay', () => {
    expect(reconnectDelayMs(1, 1000)).toBe(1000)
    expect(reconnectDelayMs(2, 1000)).toBe(1600)
    expect(reconnectDelayMs(20, 1000, 5000)).toBe(5000)
  })
})