package expo.modules.devmenu

import android.app.Activity
import android.app.Application
import android.content.Context
import android.content.Intent
import android.graphics.Typeface
import android.hardware.SensorManager
import android.os.Bundle
import android.util.Log
import android.view.KeyEvent
import android.view.MotionEvent
import android.view.inputmethod.InputMethodManager
import com.facebook.react.ReactInstanceEventListener
import com.facebook.react.bridge.*
import com.facebook.react.devsupport.HMRClient
import com.facebook.react.modules.core.DeviceEventManagerModule
import com.facebook.react.views.text.ReactFontManager
import expo.interfaces.devmenu.DevMenuDelegateInterface
import expo.interfaces.devmenu.DevMenuManagerInterface
import expo.interfaces.devmenu.DevMenuPreferencesInterface
import expo.interfaces.devmenu.ReactHostWrapper
import expo.modules.devmenu.api.DevMenuMetroClient
import expo.modules.devmenu.detectors.ShakeDetector
import expo.modules.devmenu.detectors.ThreeFingerLongPressDetector
import expo.modules.devmenu.devtools.DevMenuDevToolsDelegate
import expo.modules.devmenu.modules.DevMenuPreferences
import expo.modules.devmenu.modules.DevMenuPreferencesHandle
import expo.modules.devmenu.react.DevMenuPackagerCommandHandlersSwapper
import expo.modules.devmenu.react.DevMenuShakeDetectorListenerSwapper
import expo.modules.devmenu.tests.DevMenuDisabledTestInterceptor
import expo.modules.devmenu.tests.DevMenuTestInterceptor
import expo.modules.devmenu.websockets.DevMenuCommandHandlersProvider
import expo.modules.manifests.core.Manifest
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import java.lang.ref.WeakReference

object DevMenuManager : DevMenuManagerInterface, LifecycleEventListener {
  data class KeyCommand(val code: Int, val withShift: Boolean = false)

  data class Callback(val name: String, val shouldCollapse: Boolean)

  val metroClient: DevMenuMetroClient by lazy { DevMenuMetroClient() }
  private var fontsWereLoaded = false

  // change it and run `yarn start` in `expo-dev-menu` to launch dev menu from local packager
  private val useDeveloperSupport = false

  private var shakeDetector: ShakeDetector? = null
  private var threeFingerLongPressDetector: ThreeFingerLongPressDetector? = null
  private var preferences: DevMenuPreferencesInterface? = null
  internal var delegate: DevMenuDelegateInterface? = null
  private var shouldLaunchDevMenuOnStart: Boolean = false
  private lateinit var devMenuHost: ReactHostWrapper
  private var currentReactInstance: WeakReference<ReactHostWrapper?> = WeakReference(null)
  private var canLaunchDevMenuOnStart = true
  var testInterceptor: DevMenuTestInterceptor = DevMenuDisabledTestInterceptor()

  var currentManifest: Manifest? = null
  var currentManifestURL: String? = null
  var launchUrl: String? = null

  //region helpers

  fun getReactHost(): ReactHostWrapper? {
    return delegate?.reactHost()
  }

  fun getDevToolsDelegate(): DevMenuDevToolsDelegate? {
    val reactHost = getReactHost() ?: return null
    return DevMenuDevToolsDelegate(this, reactHost)
  }

  private val delegateReactContext: ReactContext?
    get() = delegate?.reactHost()?.currentReactContext

  private val delegateActivity: Activity?
    get() = delegateReactContext?.currentActivity

  private val hostReactContext: ReactContext?
    get() = devMenuHost.currentReactContext

  private val hostActivity: Activity?
    get() = hostReactContext?.currentActivity

  //endregion

  //region init

  @Suppress("UNCHECKED_CAST")
  private fun maybeInitDevMenuHost(application: Application) {
    if (!this::devMenuHost.isInitialized) {
      devMenuHost = ReactHostWrapper(
        reactNativeHost = DevMenuReactNativeHost(application, useDeveloperSupport),
        reactHostProvider = { DevMenuReactHost.create(application, useDeveloperSupport) }
      )
      UiThreadUtil.runOnUiThread {
        devMenuHost.start()
      }
    }
  }

  private fun setUpReactInstance(reactHost: ReactHostWrapper) {
    currentReactInstance = WeakReference(reactHost)

    val handlers = DevMenuCommandHandlersProvider(this, reactHost)
      .createCommandHandlers()

    DevMenuPackagerCommandHandlersSwapper()
      .swapPackagerCommandHandlers(
        reactHost,
        handlers
      )

    DevMenuShakeDetectorListenerSwapper()
      .swapShakeDetectorListener(
        reactHost
      ) {}

    if (reactHost.currentReactContext == null) {
      reactHost.addReactInstanceEventListener(object : ReactInstanceEventListener {
        override fun onReactContextInitialized(context: ReactContext) {
          if (currentReactInstance.get() === reactHost) {
            handleLoadedDelegateContext(context)
          }
          reactHost.removeReactInstanceEventListener(this)
        }
      })
    } else {
      handleLoadedDelegateContext(reactHost.currentReactContext!!)
    }
  }

  private fun hasDisableOnboardingQueryParam(urlString: String): Boolean {
    return urlString.contains("disableOnboarding=1")
  }

  /**
   * Starts dev menu if wasn't initialized, prepares for opening menu at launch if needed and gets [DevMenuPreferences].
   * We can't open dev menu here, cause then the app will crash - two react instance try to render.
   * So we wait until the [reactContext] activity will be ready.
   */
  private fun handleLoadedDelegateContext(reactContext: ReactContext) {
    Log.i(DEV_MENU_TAG, "Delegate's context was loaded.")

    maybeInitDevMenuHost(
      reactContext.currentActivity?.application
        ?: reactContext.applicationContext as Application
    )
    maybeStartDetectors(reactContext.applicationContext)
    preferences = (
      testInterceptor.overrideSettings()
        ?: DevMenuPreferencesHandle(reactContext)
      ).also {
      if (hasDisableOnboardingQueryParam(currentManifestURL.orEmpty()) || hasDisableOnboardingQueryParam(launchUrl.orEmpty())) {
        it.isOnboardingFinished = true
      }
    }.also {
      shouldLaunchDevMenuOnStart = canLaunchDevMenuOnStart && (it.showsAtLaunch || !it.isOnboardingFinished)
      if (shouldLaunchDevMenuOnStart) {
        reactContext.addLifecycleEventListener(this)
      }
    }
  }

  fun getAppInfo(): Bundle {
    val reactContext = delegateReactContext ?: return Bundle.EMPTY
    val reactHost = delegate?.reactHost() ?: return Bundle.EMPTY

    return DevMenuAppInfo.getAppInfo(reactHost, reactContext)
  }

  fun getDevSettings(): Bundle {
    val reactHost = delegate?.reactHost()
    if (reactHost != null) {
      return DevMenuDevSettings.getDevSettings(reactHost)
    }

    return Bundle.EMPTY
  }

  fun loadFonts(context: Context) {
    if (fontsWereLoaded) {
      return
    }
    fontsWereLoaded = true

    val fonts = arrayOf(
      "Inter-Black",
      "Inter-ExtraBold",
      "Inter-Bold",
      "Inter-SemiBold",
      "Inter-Medium",
      "Inter-Regular",
      "Inter-Light",
      "Inter-ExtraLight",
      "Inter-Thin"
    )

    val assets = context.assets

    fonts.map { familyName ->
      val font = Typeface.createFromAsset(assets, "$familyName.otf")
      ReactFontManager.getInstance().setTypeface(familyName, Typeface.NORMAL, font)
    }
  }

  // captures any callbacks that are registered via the `registerDevMenuItems` module method
  // it is set and unset by the public facing `DevMenuModule`
  // when the DevMenuModule instance is unloaded (e.g between app loads) the callback list is reset to an empty list
  var registeredCallbacks = mutableListOf<Callback>()

  //endregion

  //region shake detector

  /**
   * Starts [ShakeDetector] and [ThreeFingerLongPressDetector] if they aren't running yet.
   */
  private fun maybeStartDetectors(context: Context) {
    if (shakeDetector == null) {
      shakeDetector = ShakeDetector(this::onShakeGesture).apply {
        start(context.getSystemService(Context.SENSOR_SERVICE) as SensorManager)
      }
    }

    if (threeFingerLongPressDetector == null) {
      threeFingerLongPressDetector = ThreeFingerLongPressDetector(this::onThreeFingerLongPress)
    }
  }

  /**
   * Handles shake gesture which simply toggles the dev menu.
   */
  private fun onShakeGesture() {
    if (preferences?.motionGestureEnabled == true) {
      delegateActivity?.let {
        toggleMenu(it)
      }
    }
  }

  /**
   * Handles three finger long press which simply toggles the dev menu.
   */
  private fun onThreeFingerLongPress() {
    if (preferences?.touchGestureEnabled == true) {
      delegateActivity?.let {
        toggleMenu(it)
      }
    }
  }

  //endregion

  //region delegate's LifecycleEventListener

  override fun onHostResume() {
    delegateReactContext?.removeLifecycleEventListener(this)

    if (shouldLaunchDevMenuOnStart) {
      shouldLaunchDevMenuOnStart = false
      delegateActivity?.let { activity ->
        activity.runOnUiThread {
          openMenu(activity)
        }
      }
    }
  }

  override fun onHostPause() = Unit

  override fun onHostDestroy() = Unit

  //endregion

  //region DevMenuManagerProtocol

  override fun openMenu(activity: Activity, screen: String?) {
    activity.startActivity(Intent(activity, DevMenuActivity::class.java))
  }

  /**
   * Triggers the animation that collapses the dev menu.
   */
  override fun closeMenu() {
    val activity = hostActivity as? DevMenuActivity ?: return
    if (!activity.isDestroyed) {
      activity.closeBottomSheet()
    }
  }

  override fun hideMenu() {
    hostActivity?.finish()
  }

  override fun toggleMenu(activity: Activity) {
    if (hostActivity?.isDestroyed == false) {
      closeMenu()
    } else {
      openMenu(activity)
    }
  }

  override fun onTouchEvent(ev: MotionEvent?) {
    threeFingerLongPressDetector?.onTouchEvent(ev)
  }

  override fun onKeyEvent(keyCode: Int, event: KeyEvent): Boolean {
    val imm = delegateActivity?.getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager
    // The keyboard is active. We don't want to handle events that should go to text inputs.
    // RN uses onKeyUp to handle all events connected with dev options. We need to do the same to override them.
    // However, this event is also triggered when input is edited. A better way to handle that case
    // is use onKeyDown event. However, it doesn't work well with key commands and we can't override RN implementation in that approach.
    if (imm?.isAcceptingText != false) {
      return false
    }

    val keyCommand = KeyCommand(
      code = keyCode,
      withShift = event.modifiers and KeyEvent.META_SHIFT_MASK > 0
    )

    if (keyCommand == KeyCommand(KeyEvent.KEYCODE_MENU)) {
      delegateActivity?.let { openMenu(it) }
      return true
    }

    if (preferences?.keyCommandsEnabled != true) {
      return false
    }

    val action = when (keyCommand) {
      KeyCommand(KeyEvent.KEYCODE_R) -> ::reload
      KeyCommand(KeyEvent.KEYCODE_P) -> ::togglePerformanceMonitor
      KeyCommand(KeyEvent.KEYCODE_I) -> ::toggleInspector
      else -> return false
    }

    action()
    closeMenu()
    return true
  }

  fun reload() {
    val devToolsDelegate = getDevToolsDelegate()
    devToolsDelegate?.reload()
  }

  fun togglePerformanceMonitor() {
    val devToolsDelegate = getDevToolsDelegate()
    delegateActivity?.let {
      devToolsDelegate?.togglePerformanceMonitor(it)
    }
  }

  fun toggleInspector() {
    val devToolsDelegate = getDevToolsDelegate()
    devToolsDelegate?.toggleElementInspector()
  }

  fun openJSInspector() {
    val devToolsDelegate = getDevToolsDelegate()
    // If internal setting aren't available we can't open inspector
    if (devToolsDelegate?.devInternalSettings == null) {
      return
    }
    devToolsDelegate.openJSInspector()
  }

  fun toggleFastRefresh() {
    val devToolsDelegate = getDevToolsDelegate()
    val internalSettings = devToolsDelegate?.devInternalSettings
      ?: return

    val nextEnabled = !internalSettings.isHotModuleReplacementEnabled
    internalSettings.isHotModuleReplacementEnabled = nextEnabled

    val reactApplicationContext = delegateReactContext?.applicationContext as? ReactApplicationContext
    if (reactApplicationContext != null) {
      if (nextEnabled) {
        reactApplicationContext.getJSModule(HMRClient::class.java).enable()
      } else {
        reactApplicationContext.getJSModule(HMRClient::class.java).disable()
      }
    }
    if (nextEnabled && !internalSettings.isJSDevModeEnabled) {
      internalSettings.isJSDevModeEnabled = true
      devToolsDelegate.reload()
    }
  }

  override fun setDelegate(newDelegate: DevMenuDelegateInterface) {
    Log.i(DEV_MENU_TAG, "Set new dev-menu delegate: ${newDelegate.javaClass}")
    // removes event listener for old delegate
    delegateReactContext?.removeLifecycleEventListener(this)

    delegate = newDelegate.apply {
      setUpReactInstance(this.reactHost())
    }
  }

  override fun initializeWithReactHost(reactHost: ReactHostWrapper) {
    setDelegate(DevMenuDefaultDelegate(reactHost))
  }

  override fun sendEventToDelegateBridge(eventName: String, eventData: Any?) {
    delegateReactContext
      ?.getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter::class.java)
      ?.emit(eventName, eventData)
  }

  override fun isInitialized(): Boolean {
    return delegate !== null
  }

  override val coroutineScope = CoroutineScope(Dispatchers.Default)

  override fun getSettings(): DevMenuPreferencesInterface? = preferences

  override fun getMenuHost(): ReactHostWrapper = devMenuHost

  override fun setCanLaunchDevMenuOnStart(canLaunchDevMenuOnStart: Boolean) {
    this.canLaunchDevMenuOnStart = canLaunchDevMenuOnStart
  }

  override fun synchronizeDelegate() {
    val newReactInstance = requireNotNull(delegate).reactHost()
    if (newReactInstance != currentReactInstance.get()) {
      setUpReactInstance(newReactInstance)
    }
  }

  fun getMenuPreferences(): Bundle {
    return Bundle().apply {
      putBoolean("isOnboardingFinished", getSettings()?.isOnboardingFinished ?: false)
    }
  }

  //endregion
}