/*
 * Copyright 2019 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 androidx.compose.material

import androidx.compose.foundation.shape.CornerBasedShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.unit.dp

/**
 * <a href="https://material.io/design/shape/about-shape.html" class="external" target="_blank">Material Design shape</a>.
 *
 * Material surfaces can be displayed in different shapes. Shapes direct attention, identify
 * components, communicate state, and express brand.
 *
 * ![Shape image](https://developer.android.com/images/reference/androidx/compose/material/shape.png)
 *
 * Components are grouped into shape categories based on their size. These categories provide a
 * way to change multiple component values at once, by changing the category’s values.
 * Shape categories include:
 * - Small components
 * - Medium components
 * - Large components
 *
 * See [Material shape specification](https://material.io/design/shape/applying-shape-to-ui.html)
 */
@Immutable
class Shapes(
    /**
     * Shape used by small components like [Button] or [Snackbar]. Components like
     * [FloatingActionButton], [ExtendedFloatingActionButton] use this shape, but override
     * the corner size to be 50%. [TextField] uses this shape with overriding the bottom corners
     * to zero.
     */
    val small: CornerBasedShape = RoundedCornerShape(4.dp),
    /**
     * Shape used by medium components like [Card] or [AlertDialog].
     */
    val medium: CornerBasedShape = RoundedCornerShape(4.dp),
    /**
     * Shape used by large components like [ModalDrawer] or [ModalBottomSheetLayout].
     */
    val large: CornerBasedShape = RoundedCornerShape(0.dp)
) {

    /**
     * Returns a copy of this Shapes, optionally overriding some of the values.
     */
    fun copy(
        small: CornerBasedShape = this.small,
        medium: CornerBasedShape = this.medium,
        large: CornerBasedShape = this.large
    ): Shapes = Shapes(
        small = small,
        medium = medium,
        large = large
    )

    override fun equals(other: Any?): Boolean {
        if (this === other) return true
        if (other !is Shapes) return false

        if (small != other.small) return false
        if (medium != other.medium) return false
        if (large != other.large) return false

        return true
    }

    override fun hashCode(): Int {
        var result = small.hashCode()
        result = 31 * result + medium.hashCode()
        result = 31 * result + large.hashCode()
        return result
    }

    override fun toString(): String {
        return "Shapes(small=$small, medium=$medium, large=$large)"
    }
}

/**
 * CompositionLocal used to specify the default shapes for the surfaces.
 */
internal val LocalShapes = staticCompositionLocalOf { Shapes() }