package io.oxygenhub.android.ui

import androidx.compose.material3.darkColorScheme

import androidx.compose.ui.graphics.Color

import androidx.compose.ui.graphics.luminance

import io.oxygenhub.android.ui.theme.lifted

import org.junit.Assert.assertTrue

import org.junit.Test

class ThemeTest {

    @Test

    fun wallpaperColoursInTheDarkLiftEachContainerAStepAboveTheLast() {

        // Android's dark tones a shade apart, as a near-black wallpaper gives them.

        val near = Color(0xFF121212)

        val s = lifted(

            darkColorScheme(

                background = Color(0xFF0F0F0F),

                onSurface = Color(0xFFE6E6E6),

                surfaceContainerLow = near,

                surfaceContainer = near,

                surfaceContainerHigh = near,

                surfaceContainerHighest = near,

            ),

        )

        val steps = listOf(s.background, s.surfaceContainerLow, s.surfaceContainer, s.surfaceContainerHigh, s.surfaceContainerHighest, s.outlineVariant)

            .map { it.luminance() }

        assertTrue("each above the last: $steps", steps.zipWithNext().all { (a, b) -> b > a })

        assertTrue("a panel's edge stands well off the background: $steps", steps.last() > steps.first() * 3)

    }

}