/**
 * 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.utils

import android.content.Context
import android.content.res.Resources
import android.graphics.drawable.Drawable
import android.util.TypedValue
import androidx.annotation.AttrRes
import androidx.appcompat.content.res.AppCompatResources

/** Utility class for resoling attribute references in the theme. */
object AttributeResolver {
    fun getDrawable(context: Context, @AttrRes attribute: Int): Drawable? {
        return AppCompatResources.getDrawable(context, getResource(context, attribute))
    }

    fun getNullableDrawable(context: Context, @AttrRes attribute: Int): Drawable? {
        if (!(hasAttribute(context, attribute))) {
            return null
        }
        val resourceId = getResource(context, attribute)
        if (resourceId == Resources.ID_NULL) {
            return null
        }
        return AppCompatResources.getDrawable(context, resourceId)
    }
    fun getResource(context: Context, @AttrRes attribute: Int): Int {
        val outValue = TypedValue()
        check(context.theme.resolveAttribute(attribute, outValue, true))
        return outValue.resourceId
    }
    fun hasAttribute(context: Context, @AttrRes attribute: Int): Boolean {
        return context.theme.resolveAttribute(attribute, TypedValue(), true)
    }
}