package expo.modules.calendar

import android.Manifest
import android.content.ContentUris
import android.content.ContentValues
import android.content.Intent
import android.database.Cursor
import android.os.Bundle
import android.provider.CalendarContract
import android.util.Log
import expo.modules.calendar.EventRecurrenceUtils.createRecurrenceRule
import expo.modules.calendar.EventRecurrenceUtils.extractRecurrence
import expo.modules.calendar.dialogs.CreateEventContract
import expo.modules.calendar.dialogs.CreateEventIntentResult
import expo.modules.calendar.dialogs.CreatedEventOptions
import expo.modules.calendar.dialogs.ViewEventIntentResult
import expo.modules.calendar.dialogs.ViewEventContract
import expo.modules.calendar.dialogs.ViewedEventOptions
import expo.modules.core.arguments.ReadableArguments
import expo.modules.core.errors.InvalidArgumentException
import expo.modules.interfaces.permissions.Permissions
import expo.modules.kotlin.Promise
import expo.modules.kotlin.activityresult.AppContextActivityResultLauncher
import expo.modules.kotlin.exception.Exceptions
import expo.modules.kotlin.functions.Coroutine
import expo.modules.kotlin.modules.Module
import expo.modules.kotlin.modules.ModuleDefinition
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.cancel
import kotlinx.coroutines.launch
import java.text.ParseException
import java.text.SimpleDateFormat
import java.util.*

class CalendarModule : Module() {
  private val moduleCoroutineScope = CoroutineScope(Dispatchers.Default)
  private val contentResolver
    get() = (appContext.reactContext ?: throw Exceptions.ReactContextLost()).contentResolver

  private lateinit var createEventLauncher: AppContextActivityResultLauncher<CreatedEventOptions, CreateEventIntentResult>
  private lateinit var viewEventLauncher: AppContextActivityResultLauncher<ViewedEventOptions, ViewEventIntentResult>

  private val sdf = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'").apply {
    timeZone = TimeZone.getTimeZone("GMT")
  }

  override fun definition() = ModuleDefinition {
    Name("ExpoCalendar")

    RegisterActivityContracts {
      createEventLauncher = registerForActivityResult(
        CreateEventContract()
      )
      viewEventLauncher = registerForActivityResult(
        ViewEventContract()
      )
    }

    OnDestroy {
      try {
        moduleCoroutineScope.cancel(ModuleDestroyedException())
      } catch (e: IllegalStateException) {
        Log.e(TAG, "The scope does not have a job in it")
      }
    }

    AsyncFunction("getCalendarsAsync") { type: String?, promise: Promise ->
      withPermissions(promise) {
        if (type != null && type == "reminder") {
          promise.reject("E_CALENDARS_NOT_FOUND", "Calendars of type `reminder` are not supported on Android", null)
          return@withPermissions
        }
        launchAsyncWithModuleScope(promise) {
          try {
            val calendars = findCalendars()
            promise.resolve(calendars)
          } catch (e: Exception) {
            promise.reject("E_CALENDARS_NOT_FOUND", "Calendars could not be found", e)
          }
        }
      }
    }

    AsyncFunction("saveCalendarAsync") { details: ReadableArguments, promise: Promise ->
      withPermissions(promise) {
        launchAsyncWithModuleScope(promise) {
          try {
            val calendarID = saveCalendar(details)
            promise.resolve(calendarID.toString())
          } catch (e: Exception) {
            promise.reject("E_CALENDAR_NOT_SAVED", "Calendar could not be saved: " + e.message, e)
          }
        }
      }
    }

    AsyncFunction("deleteCalendarAsync") { calendarID: String, promise: Promise ->
      withPermissions(promise) {
        launchAsyncWithModuleScope(promise) {
          val successful = deleteCalendar(calendarID)
          if (successful) {
            promise.resolve(null)
          } else {
            promise.reject("E_CALENDAR_NOT_DELETED", "Calendar with id $calendarID could not be deleted", null)
          }
        }
      }
    }

    AsyncFunction("getEventsAsync") { startDate: Any, endDate: Any, calendars: List<String>, promise: Promise ->
      withPermissions(promise) {
        launchAsyncWithModuleScope(promise) {
          try {
            val results = findEvents(startDate, endDate, calendars)
            promise.resolve(results)
          } catch (e: Exception) {
            promise.reject("E_EVENTS_NOT_FOUND", "Events could not be found", e)
          }
        }
      }
    }

    AsyncFunction("getEventByIdAsync") { eventID: String, promise: Promise ->
      withPermissions(promise) {
        launchAsyncWithModuleScope(promise) {
          val results = findEventById(eventID)
          if (results != null) {
            promise.resolve(results)
          } else {
            promise.reject("E_EVENT_NOT_FOUND", "Event with id $eventID could not be found", null)
          }
        }
      }
    }

    AsyncFunction("saveEventAsync") { details: ReadableArguments, _: ReadableArguments?, promise: Promise ->
      withPermissions(promise) {
        launchAsyncWithModuleScope(promise) {
          try {
            val eventID = saveEvent(details)
            promise.resolve(eventID.toString())
          } catch (e: ParseException) {
            promise.reject("E_EVENT_NOT_SAVED", "Event could not be saved", e)
          } catch (e: EventNotSavedException) {
            promise.reject("E_EVENT_NOT_SAVED", "Event could not be saved", e)
          } catch (e: InvalidArgumentException) {
            promise.reject("E_EVENT_NOT_SAVED", "Event could not be saved", e)
          }
        }
      }
    }

    AsyncFunction("deleteEventAsync") { details: ReadableArguments, _: ReadableArguments?, promise: Promise ->
      withPermissions(promise) {
        launchAsyncWithModuleScope(promise) {
          try {
            val successful = removeEvent(details)
            if (successful) {
              promise.resolve(null)
            } else {
              promise.reject("E_EVENT_NOT_DELETED", "Event with id ${details.getString("id")} could not be deleted", null)
            }
          } catch (e: Exception) {
            promise.reject("E_EVENT_NOT_DELETED", "Event with id ${details.getString("id")} could not be deleted", e)
          }
        }
      }
    }

    AsyncFunction("getAttendeesForEventAsync") { eventID: String, promise: Promise ->
      withPermissions(promise) {
        launchAsyncWithModuleScope(promise) {
          val results = findAttendeesByEventId(eventID)
          promise.resolve(results)
        }
      }
    }

    AsyncFunction("saveAttendeeForEventAsync") { details: ReadableArguments, eventID: String?, promise: Promise ->
      withPermissions(promise) {
        launchAsyncWithModuleScope(promise) {
          try {
            val attendeeID = saveAttendeeForEvent(details, eventID)
            promise.resolve(attendeeID.toString())
          } catch (e: Exception) {
            promise.reject("E_ATTENDEE_NOT_SAVED", "Attendees for event with id $eventID could not be saved", e)
          }
        }
      }
    }

    AsyncFunction("deleteAttendeeAsync") { attendeeID: String, promise: Promise ->
      withPermissions(promise) {
        launchAsyncWithModuleScope(promise) {
          val successful = deleteAttendee(attendeeID)
          if (successful) {
            promise.resolve(null)
          } else {
            promise.reject("E_ATTENDEE_NOT_DELETED", "Attendee with id $attendeeID could not be deleted", null)
          }
        }
      }
    }

    AsyncFunction("createEventInCalendarAsync") Coroutine { eventOptions: CreatedEventOptions ->
      val result = createEventLauncher.launch(eventOptions)
      return@Coroutine result
    }

    AsyncFunction("openEventInCalendarAsync") Coroutine { params: ViewedEventOptions ->
      val result = viewEventLauncher.launch(params)
      return@Coroutine result
    }

    AsyncFunction("editEventInCalendarAsync") Coroutine { params: ViewedEventOptions ->
      viewEventLauncher.launch(params)
      val editResult = CreateEventIntentResult()
      return@Coroutine editResult
    }

    /**
     * @deprecated in favor of openEventInCalendarAsync
     * */
    AsyncFunction("openEventInCalendar") { eventID: String ->
      val context = appContext.reactContext ?: throw Exceptions.ReactContextLost()
      val uri = ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventID.toLong())
      val sendIntent = Intent(Intent.ACTION_VIEW).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK).setData(uri)
      if (sendIntent.resolveActivity(context.packageManager) != null) {
        context.startActivity(sendIntent)
      }
    }

    AsyncFunction("requestCalendarPermissionsAsync") { promise: Promise ->
      Permissions.askForPermissionsWithPermissionsManager(appContext.permissions, promise, Manifest.permission.READ_CALENDAR, Manifest.permission.WRITE_CALENDAR)
    }

    AsyncFunction("getCalendarPermissionsAsync") { promise: Promise ->
      Permissions.getPermissionsWithPermissionsManager(appContext.permissions, promise, Manifest.permission.READ_CALENDAR, Manifest.permission.WRITE_CALENDAR)
    }
  }

  private inline fun launchAsyncWithModuleScope(promise: Promise, crossinline block: () -> Unit) {
    moduleCoroutineScope.launch {
      try {
        block()
      } catch (e: ModuleDestroyedException) {
        promise.reject("E_CALENDAR_MODULE_DESTROYED", "Module destroyed, promise canceled", null)
      }
    }
  }

  private inline fun withPermissions(promise: Promise, block: () -> Unit) {
    if (!checkPermissions(promise)) {
      return
    }
    block()
  }

  //endregion
  @Throws(SecurityException::class)
  private fun findCalendars(): List<Bundle> {
    val uri = CalendarContract.Calendars.CONTENT_URI
    val cursor = contentResolver.query(uri, findCalendarsQueryParameters, null, null, null)
    requireNotNull(cursor) { "Cursor shouldn't be null" }
    return cursor.use(::serializeEventCalendars)
  }

  private fun findEvents(startDate: Any, endDate: Any, calendars: List<String>): List<Bundle> {
    val eStartDate = Calendar.getInstance()
    val eEndDate = Calendar.getInstance()
    try {
      setDateInCalendar(eStartDate, startDate)
      setDateInCalendar(eEndDate, endDate)
    } catch (e: ParseException) {
      Log.e(TAG, "error parsing", e)
    } catch (e: Exception) {
      Log.e(TAG, "misc error parsing", e)
    }
    val uriBuilder = CalendarContract.Instances.CONTENT_URI.buildUpon()
    ContentUris.appendId(uriBuilder, eStartDate.timeInMillis)
    ContentUris.appendId(uriBuilder, eEndDate.timeInMillis)
    val uri = uriBuilder.build()
    var selection =
      "((${CalendarContract.Instances.BEGIN} >= ${eStartDate.timeInMillis}) " +
        "AND (${CalendarContract.Instances.END} <= ${eEndDate.timeInMillis}) " +
        "AND (${CalendarContract.Instances.VISIBLE} = 1) "
    if (calendars.isNotEmpty()) {
      var calendarQuery = "AND ("
      for (i in calendars.indices) {
        calendarQuery += CalendarContract.Instances.CALENDAR_ID + " = '" + calendars[i] + "'"
        if (i != calendars.size - 1) {
          calendarQuery += " OR "
        }
      }
      calendarQuery += ")"
      selection += calendarQuery
    }
    selection += ")"
    val sortOrder = "${CalendarContract.Instances.BEGIN} ASC"
    val cursor = contentResolver.query(
      uri,
      findEventsQueryParameters,
      selection,
      null,
      sortOrder
    )

    requireNotNull(cursor) { "Cursor shouldn't be null" }
    return cursor.use(::serializeEvents)
  }

  private fun findEventById(eventID: String): Bundle? {
    val uri = ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventID.toInt().toLong())
    val selection = "((${CalendarContract.Events.DELETED} != 1))"
    val cursor = contentResolver.query(
      uri,
      findEventByIdQueryParameters,
      selection,
      null,
      null
    )
    requireNotNull(cursor) { "Cursor shouldn't be null" }
    return cursor.use {
      if (cursor.count > 0) {
        cursor.moveToFirst()
        serializeEvent(cursor)
      } else {
        null
      }
    }
  }

  private fun findCalendarById(calendarID: String): Bundle? {
    val uri = ContentUris.withAppendedId(CalendarContract.Calendars.CONTENT_URI, calendarID.toInt().toLong())
    val cursor = contentResolver.query(
      uri,
      findCalendarByIdQueryFields,
      null,
      null,
      null
    )
    requireNotNull(cursor) { "Cursor shouldn't be null" }
    return cursor.use {
      if (it.count > 0) {
        it.moveToFirst()
        serializeEventCalendar(it)
      } else {
        null
      }
    }
  }

  private fun findAttendeesByEventId(eventID: String): List<Bundle> {
    val cursor = CalendarContract.Attendees.query(
      contentResolver,
      eventID.toLong(),
      findAttendeesByEventIdQueryParameters
    )
    return cursor.use(::serializeAttendees)
  }

  @Throws(Exception::class)
  private fun saveCalendar(details: ReadableArguments): Int {
    val calendarEventBuilder = CalendarEventBuilder(details)

    calendarEventBuilder
      .putEventString(CalendarContract.Calendars.NAME, "name")
      .putEventString(CalendarContract.Calendars.CALENDAR_DISPLAY_NAME, "title")
      .putEventBoolean(CalendarContract.Calendars.VISIBLE, "isVisible")
      .putEventBoolean(CalendarContract.Calendars.SYNC_EVENTS, "isSynced")

    return if (details.containsKey("id")) {
      val calendarID = details.getString("id").toInt()
      val updateUri = ContentUris.withAppendedId(CalendarContract.Calendars.CONTENT_URI, calendarID.toLong())
      contentResolver.update(updateUri, calendarEventBuilder.build(), null, null)
      calendarID
    } else {
      calendarEventBuilder.checkIfContainsRequiredKeys(
        "name",
        "title",
        "source",
        "color",
        "accessLevel",
        "ownerAccount"
      )
      val source = details.getArguments("source")
      if (!source.containsKey("name")) {
        throw Exception("new calendars require a `source` object with a `name`")
      }
      var isLocalAccount = false
      if (source.containsKey("isLocalAccount")) {
        isLocalAccount = source.getBoolean("isLocalAccount")
      }
      if (!source.containsKey("type") && !isLocalAccount) {
        throw Exception("new calendars require a `source` object with a `type`, or `isLocalAccount`: true")
      }

      calendarEventBuilder
        .put(CalendarContract.Calendars.ACCOUNT_NAME, source.getString("name"))
        .put(CalendarContract.Calendars.ACCOUNT_TYPE, if (isLocalAccount) CalendarContract.ACCOUNT_TYPE_LOCAL else source.getString("type"))
        .put(CalendarContract.Calendars.CALENDAR_COLOR, details.getInt("color"))
        .put(CalendarContract.Calendars.CALENDAR_ACCESS_LEVEL, calAccessConstantMatchingString(details.getString("accessLevel")))
        .put(CalendarContract.Calendars.OWNER_ACCOUNT, details.getString("ownerAccount"))
        // end required fields
        .putEventTimeZone(CalendarContract.Calendars.CALENDAR_TIME_ZONE, "timeZone")
        .putEventDetailsList(CalendarContract.Calendars.ALLOWED_REMINDERS, "allowedReminders") { reminderConstantMatchingString(it as String?) }
        .putEventDetailsList(CalendarContract.Calendars.ALLOWED_AVAILABILITY, "allowedAvailabilities") { availabilityConstantMatchingString(it as String) }
        .putEventDetailsList(CalendarContract.Calendars.ALLOWED_ATTENDEE_TYPES, "allowedAttendeeTypes") { attendeeTypeConstantMatchingString(it as String) }

      val uriBuilder = CalendarContract.Calendars.CONTENT_URI
        .buildUpon()
        .appendQueryParameter(CalendarContract.CALLER_IS_SYNCADAPTER, "true")
        .appendQueryParameter(CalendarContract.Calendars.ACCOUNT_NAME, source.getString("name"))
        .appendQueryParameter(CalendarContract.Calendars.ACCOUNT_TYPE, if (isLocalAccount) CalendarContract.ACCOUNT_TYPE_LOCAL else source.getString("type"))

      val calendarsUri = uriBuilder.build()
      val calendarUri = contentResolver.insert(calendarsUri, calendarEventBuilder.build())
      calendarUri!!.lastPathSegment!!.toInt()
    }
  }

  @Throws(SecurityException::class)
  private fun deleteCalendar(calendarId: String): Boolean {
    val uri = ContentUris.withAppendedId(CalendarContract.Calendars.CONTENT_URI, calendarId.toInt().toLong())
    val rows = contentResolver.delete(uri, null, null)
    return rows > 0
  }

  @Throws(EventNotSavedException::class, ParseException::class, SecurityException::class, InvalidArgumentException::class)
  private fun saveEvent(details: ReadableArguments): Int {
    val calendarEventBuilder = CalendarEventBuilder(details)
    if (details.containsKey("startDate")) {
      val startCal = Calendar.getInstance()
      val startDate = details["startDate"]
      try {
        when (startDate) {
          is String -> {
            val parsedDate = sdf.parse(startDate)
            if (parsedDate != null) {
              startCal.time = parsedDate
              calendarEventBuilder.put(CalendarContract.Events.DTSTART, startCal.timeInMillis)
            } else {
              Log.e(TAG, "Parsed date is null")
            }
          }

          is Number -> {
            calendarEventBuilder.put(CalendarContract.Events.DTSTART, startDate.toLong())
          }

          else -> {
            Log.e(TAG, "startDate has unsupported type")
          }
        }
      } catch (e: ParseException) {
        Log.e(TAG, "error", e)
        throw e
      }
    }
    if (details.containsKey("endDate")) {
      val endCal = Calendar.getInstance()
      val endDate = details["endDate"]
      try {
        if (endDate is String) {
          val parsedDate = sdf.parse(endDate)
          if (parsedDate != null) {
            endCal.time = parsedDate
            calendarEventBuilder.put(CalendarContract.Events.DTEND, endCal.timeInMillis)
          } else {
            Log.e(TAG, "Parsed date is null")
          }
        } else if (endDate is Number) {
          calendarEventBuilder.put(CalendarContract.Events.DTEND, endDate.toLong())
        }
      } catch (e: ParseException) {
        Log.e(TAG, "error", e)
        throw e
      }
    }
    if (details.containsKey("recurrenceRule")) {
      val recurrenceRule = details.getArguments("recurrenceRule")
      if (recurrenceRule.containsKey("frequency")) {
        val opts = extractRecurrence(recurrenceRule)

        if (opts.endDate == null && opts.occurrence == null) {
          val eventStartDate = calendarEventBuilder.getAsLong(CalendarContract.Events.DTSTART)
          val eventEndDate = calendarEventBuilder.getAsLong(CalendarContract.Events.DTEND)
          val duration = (eventEndDate - eventStartDate) / 1000
          calendarEventBuilder
            .putNull(CalendarContract.Events.LAST_DATE)
            .putNull(CalendarContract.Events.DTEND)
            .put(CalendarContract.Events.DURATION, "PT${duration}S")
        }
        val rule = createRecurrenceRule(opts)
        calendarEventBuilder.put(CalendarContract.Events.RRULE, rule)
      }
    }

    calendarEventBuilder
      .putEventBoolean(CalendarContract.Events.HAS_ALARM, "alarms", true)
      .putEventString(CalendarContract.Events.AVAILABILITY, "availability", ::availabilityConstantMatchingString)
      .putEventString(CalendarContract.Events.TITLE, "title")
      .putEventString(CalendarContract.Events.DESCRIPTION, "notes")
      .putEventString(CalendarContract.Events.EVENT_LOCATION, "location")
      .putEventString(CalendarContract.Events.ORGANIZER, "organizerEmail")
      .putEventBoolean(CalendarContract.Events.ALL_DAY, "allDay")
      .putEventBoolean(CalendarContract.Events.GUESTS_CAN_MODIFY, "guestsCanModify")
      .putEventBoolean(CalendarContract.Events.GUESTS_CAN_INVITE_OTHERS, "guestsCanInviteOthers")
      .putEventBoolean(CalendarContract.Events.GUESTS_CAN_SEE_GUESTS, "guestsCanSeeGuests")
      .putEventTimeZone(CalendarContract.Events.EVENT_TIMEZONE, "timeZone")
      .putEventTimeZone(CalendarContract.Events.EVENT_END_TIMEZONE, "endTimeZone")
      .putEventString(CalendarContract.Events.ACCESS_LEVEL, "accessLevel", ::accessConstantMatchingString)

    return if (details.containsKey("id")) {
      val eventID = details.getString("id").toInt()
      val updateUri = ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventID.toLong())
      contentResolver.update(updateUri, calendarEventBuilder.build(), null, null)
      removeRemindersForEvent(eventID)
      if (details.containsKey("alarms")) {
        createRemindersForEvent(eventID, details.getList("alarms"))
      }
      eventID
    } else {
      if (details.containsKey("calendarId")) {
        val calendar = findCalendarById(details.getString("calendarId"))
        if (calendar != null) {
          calendarEventBuilder.put(CalendarContract.Events.CALENDAR_ID, calendar.getString("id")!!.toInt())
        } else {
          throw InvalidArgumentException("Couldn't find calendar with given id: " + details.getString("calendarId"))
        }
      } else {
        throw InvalidArgumentException("CalendarId is required.")
      }
      val eventsUri = CalendarContract.Events.CONTENT_URI
      val eventUri = contentResolver.insert(eventsUri, calendarEventBuilder.build())
        ?: throw EventNotSavedException()
      val eventID = eventUri.lastPathSegment!!.toInt()
      if (details.containsKey("alarms")) {
        createRemindersForEvent(eventID, details.getList("alarms"))
      }
      eventID
    }
  }

  @Throws(ParseException::class, SecurityException::class)
  private fun removeEvent(details: ReadableArguments): Boolean {
    val rows: Int
    val eventID = details.getString("id").toInt()
    if (!details.containsKey("instanceStartDate")) {
      val uri = ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventID.toLong())
      rows = contentResolver.delete(uri, null, null)
      return rows > 0
    } else {
      val exceptionValues = ContentValues()
      val startCal = Calendar.getInstance()
      val instanceStartDate = details["instanceStartDate"]
      try {
        if (instanceStartDate is String) {
          val parsedDate = sdf.parse(instanceStartDate)
          if (parsedDate != null) {
            startCal.time = parsedDate
            exceptionValues.put(CalendarContract.Events.ORIGINAL_INSTANCE_TIME, startCal.timeInMillis)
          } else {
            Log.e(TAG, "Parsed date is null")
          }
        } else if (instanceStartDate is Number) {
          exceptionValues.put(CalendarContract.Events.ORIGINAL_INSTANCE_TIME, instanceStartDate.toLong())
        }
      } catch (e: ParseException) {
        Log.e(TAG, "error", e)
        throw e
      }
      exceptionValues.put(CalendarContract.Events.STATUS, CalendarContract.Events.STATUS_CANCELED)
      val exceptionUri = ContentUris.withAppendedId(CalendarContract.Events.CONTENT_EXCEPTION_URI, eventID.toLong())
      contentResolver.insert(exceptionUri, exceptionValues)
    }
    return true
  }

  @Throws(Exception::class, SecurityException::class)
  private fun saveAttendeeForEvent(details: ReadableArguments, eventID: String?): Int {
    // Key "id" should be called "attendeeId",
    // but for now to keep API reverse compatibility it wasn't changed
    val isNew = !details.containsKey("id")
    val attendeeBuilder = AttendeeBuilder(details)
      .putString("name", CalendarContract.Attendees.ATTENDEE_NAME)
      .putString("email", CalendarContract.Attendees.ATTENDEE_EMAIL, isNew)
      .putString("role", CalendarContract.Attendees.ATTENDEE_RELATIONSHIP, isNew, ::attendeeRelationshipConstantMatchingString)
      .putString("type", CalendarContract.Attendees.ATTENDEE_TYPE, isNew, ::attendeeTypeConstantMatchingString)
      .putString("status", CalendarContract.Attendees.ATTENDEE_STATUS, isNew, ::attendeeStatusConstantMatchingString)

    return if (isNew) {
      attendeeBuilder.put(CalendarContract.Attendees.EVENT_ID, eventID?.toInt())
      val attendeesUri = CalendarContract.Attendees.CONTENT_URI
      val attendeeUri = contentResolver.insert(attendeesUri, attendeeBuilder.build())
      attendeeUri!!.lastPathSegment!!.toInt()
    } else {
      val attendeeID = details.getString("id").toInt()
      val updateUri = ContentUris.withAppendedId(CalendarContract.Attendees.CONTENT_URI, attendeeID.toLong())
      contentResolver.update(updateUri, attendeeBuilder.build(), null, null)
      attendeeID
    }
  }

  @Throws(SecurityException::class)
  private fun deleteAttendee(attendeeID: String): Boolean {
    val rows: Int
    val uri = ContentUris.withAppendedId(CalendarContract.Attendees.CONTENT_URI, attendeeID.toInt().toLong())
    rows = contentResolver.delete(uri, null, null)
    return rows > 0
  }

  @Throws(SecurityException::class)
  private fun createRemindersForEvent(eventID: Int, reminders: List<*>) {
    for (i in reminders.indices) {
      val reminder = reminders[i] as Map<*, *>
      val relativeOffset = reminder["relativeOffset"]
      if (relativeOffset is Number) {
        val minutes = -relativeOffset.toInt()
        var method = CalendarContract.Reminders.METHOD_DEFAULT
        val reminderValues = ContentValues()
        if (reminder.containsKey("method")) {
          method = reminderConstantMatchingString(reminder["method"] as? String)
        }
        reminderValues.put(CalendarContract.Reminders.EVENT_ID, eventID)
        reminderValues.put(CalendarContract.Reminders.MINUTES, minutes)
        reminderValues.put(CalendarContract.Reminders.METHOD, method)
        contentResolver.insert(CalendarContract.Reminders.CONTENT_URI, reminderValues)
      }
    }
  }

  @Throws(SecurityException::class)
  private fun removeRemindersForEvent(eventID: Int) {
    val cursor = CalendarContract.Reminders.query(
      contentResolver,
      eventID.toLong(),
      arrayOf(
        CalendarContract.Reminders._ID
      )
    )
    while (cursor.moveToNext()) {
      val reminderUri = ContentUris.withAppendedId(CalendarContract.Reminders.CONTENT_URI, cursor.getLong(0))
      contentResolver.delete(reminderUri, null, null)
    }
  }

  private fun serializeEvents(cursor: Cursor): List<Bundle> {
    val results: MutableList<Bundle> = ArrayList()
    while (cursor.moveToNext()) {
      results.add(serializeEvent(cursor))
    }
    return results
  }

  private fun serializeEvent(cursor: Cursor): Bundle {
    val foundStartDate = Calendar.getInstance()
    val foundEndDate = Calendar.getInstance()
    var startDateUTC = ""
    var endDateUTC = ""

    // may be CalendarContract.Instances.BEGIN or CalendarContract.Events.DTSTART (which have different string values)
    val startDate = cursor.getString(3)
    if (startDate != null) {
      foundStartDate.timeInMillis = startDate.toLong()
      startDateUTC = sdf.format(foundStartDate.time)
    }

    // may be CalendarContract.Instances.END or CalendarContract.Events.DTEND (which have different string values)
    val endDate = cursor.getString(4)
    if (endDate != null) {
      foundEndDate.timeInMillis = endDate.toLong()
      endDateUTC = sdf.format(foundEndDate.time)
    }
    val rrule = optStringFromCursor(cursor, CalendarContract.Events.RRULE)
    val rruleBundle = if (rrule != null) {
      val recurrenceRule = Bundle()
      val recurrenceRules = rrule.split(";").toTypedArray()
      recurrenceRule.putString("frequency", recurrenceRules[0].split("=").toTypedArray()[1].lowercase(Locale.getDefault()))
      if (recurrenceRules.size >= 2 && recurrenceRules[1].split("=").toTypedArray()[0] == "INTERVAL") {
        recurrenceRule.putInt("interval", recurrenceRules[1].split("=").toTypedArray()[1].toInt())
      }
      if (recurrenceRules.size >= 3) {
        val terminationRules = recurrenceRules[2].split("=").toTypedArray()
        if (terminationRules.size >= 2) {
          if (terminationRules[0] == "UNTIL") {
            try {
              recurrenceRule.putString("endDate", sdf.parse(terminationRules[1])?.toString())
            } catch (e: ParseException) {
              Log.e(TAG, "Couldn't parse the `endDate` property.", e)
            } catch (e: NullPointerException) {
              Log.e(TAG, "endDate is null", e)
            }
          } else if (terminationRules[0] == "COUNT") {
            recurrenceRule.putInt("occurrence", recurrenceRules[2].split("=").toTypedArray()[1].toInt())
          }
        }
        Log.e(TAG, "Couldn't parse termination rules: '${recurrenceRules[2]}'.", null)
      }
      recurrenceRule
    } else {
      null
    }

    // may be CalendarContract.Instances.EVENT_ID or CalendarContract.Events._ID (which have different string values)
    val event = Bundle().apply {
      rruleBundle?.let {
        putBundle("recurrenceRule", it)
      }
      putString("id", cursor.getString(0))
      putString("calendarId", optStringFromCursor(cursor, CalendarContract.Events.CALENDAR_ID))
      putString("title", optStringFromCursor(cursor, CalendarContract.Events.TITLE))
      putString("notes", optStringFromCursor(cursor, CalendarContract.Events.DESCRIPTION))
      putString("startDate", startDateUTC)
      putString("endDate", endDateUTC)
      putBoolean("allDay", optIntFromCursor(cursor, CalendarContract.Events.ALL_DAY) != 0)
      putString("location", optStringFromCursor(cursor, CalendarContract.Events.EVENT_LOCATION))
      putString("availability", availabilityStringMatchingConstant(optIntFromCursor(cursor, CalendarContract.Events.AVAILABILITY)))
      putParcelableArrayList("alarms", serializeAlarms(cursor.getLong(0)))
      putString("organizerEmail", optStringFromCursor(cursor, CalendarContract.Events.ORGANIZER))
      putString("timeZone", optStringFromCursor(cursor, CalendarContract.Events.EVENT_TIMEZONE))
      putString("endTimeZone", optStringFromCursor(cursor, CalendarContract.Events.EVENT_END_TIMEZONE))
      putString("accessLevel", accessStringMatchingConstant(optIntFromCursor(cursor, CalendarContract.Events.ACCESS_LEVEL)))
      putBoolean("guestsCanModify", optIntFromCursor(cursor, CalendarContract.Events.GUESTS_CAN_MODIFY) != 0)
      putBoolean("guestsCanInviteOthers", optIntFromCursor(cursor, CalendarContract.Events.GUESTS_CAN_INVITE_OTHERS) != 0)
      putBoolean("guestsCanSeeGuests", optIntFromCursor(cursor, CalendarContract.Events.GUESTS_CAN_SEE_GUESTS) != 0)
      putString("originalId", optStringFromCursor(cursor, CalendarContract.Events.ORIGINAL_ID))
    }

    // unfortunately the string values of CalendarContract.Events._ID and CalendarContract.Instances._ID are equal
    // so we'll use the somewhat brittle column number from the query
    if (cursor.columnCount > 18) {
      event.putString("instanceId", cursor.getString(18))
    }
    return event
  }

  private fun serializeAlarms(eventID: Long): ArrayList<Bundle> {
    val alarms = ArrayList<Bundle>()
    val cursor = CalendarContract.Reminders.query(
      contentResolver,
      eventID,
      arrayOf(
        CalendarContract.Reminders.MINUTES,
        CalendarContract.Reminders.METHOD
      )
    )
    while (cursor.moveToNext()) {
      val thisAlarm = Bundle()
      thisAlarm.putInt("relativeOffset", -cursor.getInt(0))
      val method = cursor.getInt(1)
      thisAlarm.putString("method", reminderStringMatchingConstant(method))
      alarms.add(thisAlarm)
    }
    return alarms
  }

  private fun serializeEventCalendars(cursor: Cursor): List<Bundle> {
    val results: MutableList<Bundle> = ArrayList()
    while (cursor.moveToNext()) {
      results.add(serializeEventCalendar(cursor))
    }
    return results
  }

  private fun serializeEventCalendar(cursor: Cursor): Bundle {
    val calendar = Bundle().apply {
      putString("id", optStringFromCursor(cursor, CalendarContract.Calendars._ID))
      putString("title", optStringFromCursor(cursor, CalendarContract.Calendars.CALENDAR_DISPLAY_NAME))
      putBoolean("isPrimary", optIntFromCursor(cursor, CalendarContract.Calendars.IS_PRIMARY) == 1)
      putStringArrayList("allowedAvailabilities", calendarAllowedAvailabilitiesFromDBString(stringFromCursor(cursor, CalendarContract.Calendars.ALLOWED_AVAILABILITY)))
      putString("name", optStringFromCursor(cursor, CalendarContract.Calendars.NAME))
      putString("color", String.format("#%06X", 0xFFFFFF and optIntFromCursor(cursor, CalendarContract.Calendars.CALENDAR_COLOR)))
      putString("ownerAccount", optStringFromCursor(cursor, CalendarContract.Calendars.OWNER_ACCOUNT))
      putString("timeZone", optStringFromCursor(cursor, CalendarContract.Calendars.CALENDAR_TIME_ZONE))
      putStringArrayList("allowedReminders", calendarAllowedRemindersFromDBString(stringFromCursor(cursor, CalendarContract.Calendars.ALLOWED_REMINDERS)))
      putStringArrayList("allowedAttendeeTypes", calendarAllowedAttendeeTypesFromDBString(stringFromCursor(cursor, CalendarContract.Calendars.ALLOWED_ATTENDEE_TYPES)))
      putBoolean("isVisible", optIntFromCursor(cursor, CalendarContract.Calendars.VISIBLE) != 0)
      putBoolean("isSynced", optIntFromCursor(cursor, CalendarContract.Calendars.SYNC_EVENTS) != 0)
      val accessLevel = optIntFromCursor(cursor, CalendarContract.Calendars.CALENDAR_ACCESS_LEVEL)
      putString("accessLevel", calAccessStringMatchingConstant(accessLevel))
      putBoolean(
        "allowsModifications",
        accessLevel == CalendarContract.Calendars.CAL_ACCESS_ROOT ||
          accessLevel == CalendarContract.Calendars.CAL_ACCESS_OWNER ||
          accessLevel == CalendarContract.Calendars.CAL_ACCESS_EDITOR ||
          accessLevel == CalendarContract.Calendars.CAL_ACCESS_CONTRIBUTOR
      )
    }
    val source = Bundle().apply {
      putString("name", optStringFromCursor(cursor, CalendarContract.Calendars.ACCOUNT_NAME))
      val type = optStringFromCursor(cursor, CalendarContract.Calendars.ACCOUNT_TYPE)
      putString("type", type)
      putBoolean("isLocalAccount", type == CalendarContract.ACCOUNT_TYPE_LOCAL)
    }
    calendar.putBundle("source", source)
    return calendar
  }

  private fun serializeAttendees(cursor: Cursor): List<Bundle> {
    val results: MutableList<Bundle> = ArrayList()
    while (cursor.moveToNext()) {
      results.add(serializeAttendee(cursor))
    }
    return results
  }

  private fun serializeAttendee(cursor: Cursor): Bundle = Bundle().apply {
    putString("id", optStringFromCursor(cursor, CalendarContract.Attendees._ID))
    putString("name", optStringFromCursor(cursor, CalendarContract.Attendees.ATTENDEE_NAME))
    putString("email", optStringFromCursor(cursor, CalendarContract.Attendees.ATTENDEE_EMAIL))
    putString("role", attendeeRelationshipStringMatchingConstant(optIntFromCursor(cursor, CalendarContract.Attendees.ATTENDEE_RELATIONSHIP)))
    putString("type", attendeeTypeStringMatchingConstant(optIntFromCursor(cursor, CalendarContract.Attendees.ATTENDEE_TYPE)))
    putString("status", attendeeStatusStringMatchingConstant(optIntFromCursor(cursor, CalendarContract.Attendees.ATTENDEE_STATUS)))
  }

  private fun optStringFromCursor(cursor: Cursor, columnName: String): String? {
    val index = cursor.getColumnIndex(columnName)
    return if (index == -1) {
      null
    } else {
      cursor.getString(index)
    }
  }

  private fun stringFromCursor(cursor: Cursor, columnName: String): String {
    val index = cursor.getColumnIndex(columnName)
    if (index == -1) {
      throw Exception("String not found")
    } else {
      return cursor.getString(index)
    }
  }

  private fun optIntFromCursor(cursor: Cursor, columnName: String): Int {
    val index = cursor.getColumnIndex(columnName)
    return if (index == -1) {
      0
    } else {
      cursor.getInt(index)
    }
  }

  private fun checkPermissions(promise: Promise): Boolean {
    if (appContext.permissions?.hasGrantedPermissions(Manifest.permission.READ_CALENDAR, Manifest.permission.WRITE_CALENDAR) != true) {
      promise.reject("E_MISSING_PERMISSIONS", "CALENDAR permission is required to do this operation.", null)
      return false
    }
    return true
  }

  private fun setDateInCalendar(calendar: Calendar, date: Any) {
    when (date) {
      is String -> {
        val parsedDate = sdf.parse(date)
        if (parsedDate != null) {
          calendar.time = parsedDate
        } else {
          Log.e(TAG, "Parsed date is null")
        }
      }

      is Number -> {
        calendar.timeInMillis = date.toLong()
      }

      else -> {
        Log.e(TAG, "date has unsupported type")
      }
    }
  }

  companion object {
    internal val TAG = CalendarModule::class.java.simpleName
  }
}