/*
 * Copyright (C) 2025 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.systemui.communal.util

import android.content.Context
import androidx.compose.ui.unit.dp
import androidx.window.layout.WindowMetricsCalculator

/**
 * [WindowSizeUtils] defines viewport breakpoints that helps create responsive mobile layout.
 *
 * @see https://developer.android.com/develop/ui/views/layout/use-window-size-classes
 */
object WindowSizeUtils {
    /** Compact screen width breakpoint. */
    val COMPACT_WIDTH = 600.dp
    /** Medium screen width breakpoint. */
    val MEDIUM_WIDTH = 840.dp
    /** Compact screen height breakpoint. */
    val COMPACT_HEIGHT = 480.dp
    /** Expanded screen height breakpoint. */
    val EXPANDED_HEIGHT = 900.dp

    /** Returns the window size category based on the current window metrics. */
    @JvmStatic
    fun getWindowSizeCategory(context: Context): WindowSizeCategory {
        val metrics = WindowMetricsCalculator.getOrCreate().computeCurrentWindowMetrics(context)
        val width = metrics.bounds.width() / metrics.density
        val height = metrics.bounds.height() / metrics.density

        if (width < COMPACT_WIDTH.value) {
            return WindowSizeCategory.MOBILE_PORTRAIT
        }
        if (height < COMPACT_HEIGHT.value) {
            return WindowSizeCategory.MOBILE_LANDSCAPE
        }
        if (
            height >= EXPANDED_HEIGHT.value ||
                (width >= MEDIUM_WIDTH.value &&
                    height in COMPACT_HEIGHT.value..EXPANDED_HEIGHT.value &&
                    // aspect ratio to exclude unfolded screen size
                    width / height >= 1.5f)
        ) {
            return WindowSizeCategory.TABLET
        }
        return WindowSizeCategory.UNFOLDED
    }

    /**
     * Represent custom breakpoints for responsive hub mode UI, which reflects device type and its
     * orientation.
     */
    enum class WindowSizeCategory {
        /** Mobile in portrait */
        MOBILE_PORTRAIT,
        /** Mobile in landscape */
        MOBILE_LANDSCAPE,
        /** Unfolded inner displays */
        UNFOLDED,
        /** Tablet */
        TABLET,
    }
}