/**
 * Copyright (C) 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.healthconnect.controller.shared

import androidx.preference.Preference
import androidx.preference.PreferenceGroup

/** Returns a [MutableIterator] over the preferences in this preference group. */
operator fun PreferenceGroup.iterator(): Iterator<Preference> =
    object : MutableIterator<Preference> {
        private var index = 0
        override fun hasNext() = index < preferenceCount
        override fun next() = getPreference(index++)
        override fun remove() {
            removePreference(getPreference(--index))
        }
    }

/** Returns a [Sequence] over the preferences in this preference group. */
val PreferenceGroup.children: Sequence<Preference>
    get() = object : Sequence<Preference> {
        override fun iterator() = this@children.iterator()
    }