import { describe, it, expect, vi, beforeEach } from 'vitest'

// Mock logger
vi.mock('@adonisjs/core/services/logger', () => ({
  default: { info: vi.fn(), debug: vi.fn(), warn: vi.fn(), error: vi.fn() },
}))

// Mock DeviceModel
vi.mock('../../../../app/models/device.js', () => ({
  default: {
    createOrUpdate: vi.fn().mockResolvedValue({}),
    findByDeviceId: vi.fn().mockResolvedValue(null),
    updateOne: vi.fn().mockResolvedValue({}),
  },
}))

// Mock CommandModel
vi.mock('../../../../app/models/command.js', () => ({
  default: {
    getCollection: vi.fn().mockReturnValue({
      find: vi.fn().mockReturnValue({ sort: vi.fn().mockReturnValue({ toArray: vi.fn().mockResolvedValue([]) }) }),
      countDocuments: vi.fn().mockResolvedValue(0),
    }),
    updateCommand: vi.fn().mockResolvedValue({}),
  },
}))

import { StateMachineManager, MachineStatus } from '../../../../app/services/cwmp/state_machine_manager.js'
import { Device } from '../../../../app/domain/device/device.js'
import { DeviceId } from '../../../../app/domain/device/device_id.js'
import { CWMPTaskQueue, ResultStatus } from '../../../../app/services/cwmp/task_queue.js'

function makeDevice(): Device {
  const device = new Device(new DeviceId('Sagemcom', 'F8B7FF', 'Livebox 4', 'LB4-TEST-001'))
  device.setDataModel('tr-181')
  device.setGpnStatus('unsupported')
  return device
}

describe('StateMachineManager — additional coverage', () => {
  let manager: StateMachineManager

  beforeEach(() => {
    vi.clearAllMocks()
    ;(StateMachineManager as any).instance = null
    manager = StateMachineManager.getInstance()
  })

  // --- Event routing for less common events ---

  it('routes VALUE_CHANGE to MainStateMachine', async () => {
    const device = makeDevice()
    const machine = await manager.startStateMachine(device, 'sess-vc', { events: ['4 VALUE CHANGE'] })
    expect(machine.status).toBe(MachineStatus.RUNNING)
    expect(machine.stateMachine.getCurrentStateName()).toBeDefined()
  })

  it('routes DIAGNOSTICS_COMPLETE to ImmediateCommandStateMachine', async () => {
    const device = makeDevice()
    const machine = await manager.startStateMachine(device, 'sess-dc', { events: ['8 DIAGNOSTICS COMPLETE'] })
    expect(machine.stateMachine.getCurrentStateName()).toBe('executing-commands')
  })

  it('routes TRANSFER_COMPLETE to ImmediateCommandStateMachine', async () => {
    const device = makeDevice()
    const machine = await manager.startStateMachine(device, 'sess-tc', { events: ['7 TRANSFER COMPLETE'] })
    expect(machine.stateMachine.getCurrentStateName()).toBe('executing-commands')
  })

  it('routes SCHEDULED to MainStateMachine', async () => {
    const device = makeDevice()
    const machine = await manager.startStateMachine(device, 'sess-sc', { events: ['3 SCHEDULED'] })
    expect(machine.stateMachine.getCurrentStateName()).toBeDefined()
  })

  it('routes unknown event to MainStateMachine', async () => {
    const device = makeDevice()
    const machine = await manager.startStateMachine(device, 'sess-unk', { events: ['99 UNKNOWN'] })
    expect(machine.stateMachine.getCurrentStateName()).toBeDefined()
  })

  // --- getHashIdForRemote ---

  it('getHashIdForRemote returns hash for bound remote', async () => {
    const device = makeDevice()
    await manager.startStateMachine(device, 'sess-hr', { events: ['0 BOOTSTRAP'] })
    manager.bindRemoteToDevice('10.0.0.1:5000', device.deviceId)
    const hash = manager.getHashIdForRemote('10.0.0.1:5000')
    expect(hash).toBeDefined()
    expect(typeof hash).toBe('string')
    expect(hash!.length).toBeGreaterThan(0)
  })

  it('getHashIdForRemote returns undefined for unknown remote', () => {
    expect(manager.getHashIdForRemote('unknown:9999')).toBeUndefined()
  })

  // --- handleCWMPResponse with fault ---

  it('handleCWMPResponse calls failTask on fault response when lastTaskId set', async () => {
    const device = makeDevice()
    const machine = await manager.startStateMachine(device, 'sess-fault', { events: ['0 BOOTSTRAP'] })
    await manager.continue('sess-fault')

    // Set lastTaskId
    const taskId = 'task-fail-test'
    machine.lastTaskId = taskId
    const taskQueue = manager.getTaskQueue()
    ;(taskQueue as any).tasks.set(taskId, { id: taskId, deviceId: device.deviceId, type: 'test', payload: {}, status: 'SENT', createdAt: new Date() })
    ;(taskQueue as any).taskCallbacks.set(taskId, vi.fn().mockResolvedValue(''))

    await manager.handleCWMPResponse('sess-fault', false, { FaultCode: 9001 })

    // lastTaskId should be cleared
    expect(machine.lastTaskId).toBeUndefined()
  })

  // --- continue() serving task from queue ---

  it('continue() serves pending task from queue when state machine returns empty', async () => {
    const device = makeDevice()
    const machine = await manager.startStateMachine(device, 'sess-q', { events: ['6 CONNECTION REQUEST'] })

    // Start the immediate command SM (completes with no commands)
    await manager.continue('sess-q')

    // After completion, continue should return ''
    const response = await manager.continue('sess-q')
    expect(response).toBe('')
  })

  // --- CONNECTION REQUEST replaces existing immediate ---

  it('new CONNECTION_REQUEST completes old immediate machine and creates fresh', async () => {
    const device = makeDevice()
    const machine1 = await manager.startStateMachine(device, 'sess-cr1', { events: ['6 CONNECTION REQUEST'] })
    expect(machine1.status).toBe(MachineStatus.RUNNING)

    // New CONNECTION REQUEST on different session
    const machine2 = await manager.startStateMachine(device, 'sess-cr2', { events: ['6 CONNECTION REQUEST'] })
    expect(machine1.status).toBe(MachineStatus.COMPLETED)
    expect(machine2.session).toBe('sess-cr2')
  })

  // --- stopCleanupTimer / startCleanupTimer ---

  it('startCleanupTimer and stopCleanupTimer work without error', () => {
    manager.startCleanupTimer(100000)
    manager.startCleanupTimer(100000) // second call should be no-op
    manager.stopCleanupTimer()
    manager.stopCleanupTimer() // second stop should be no-op
  })

  // --- shutdown ---

  it('shutdown stops timer and cleans up', async () => {
    manager.startCleanupTimer(100000)
    await manager.shutdown()
    // Should not throw
  })

  // --- enqueueImmediate ---

  it('enqueueImmediate adds task to queue', async () => {
    const device = makeDevice()
    await manager.enqueueImmediate(device, 'get_parameter_values', ['Device.Info.SW'])
    const task = manager.getTaskQueue().getTaskForDevice(device.deviceId)
    expect(task).toBeDefined()
    expect(task!.task).toBe('get_parameter_values')
  })
})