package io.oxygenhub.android.ui.theme

import android.content.Context

import androidx.compose.runtime.Composable

import androidx.compose.runtime.collectAsState

import androidx.compose.runtime.getValue

import androidx.compose.ui.platform.LocalContext

import kotlinx.coroutines.flow.MutableStateFlow

import kotlinx.coroutines.flow.StateFlow

import kotlinx.coroutines.flow.asStateFlow

/**

 * Whether the app takes its colours from the wallpaper (#24). Off by

 * default: the hub's own palette, as oxygenhub.io and its backdrops have.

 */

object Appearance {

    private const val PREFS = "appearance"

    private const val WALLPAPER = "wallpaper_colours"

    private var state: MutableStateFlow<Boolean>? = null

    fun wallpaperColours(context: Context): StateFlow<Boolean> =

        (state ?: MutableStateFlow(prefs(context).getBoolean(WALLPAPER, false)).also { state = it }).asStateFlow()

    fun setWallpaperColours(context: Context, on: Boolean) {

        prefs(context).edit().putBoolean(WALLPAPER, on).apply()

        wallpaperColours(context)

        state?.value = on

    }

    private fun prefs(context: Context) = context.applicationContext.getSharedPreferences(PREFS, Context.MODE_PRIVATE)

}

@Composable

fun rememberWallpaperColours(): Boolean {

    val on by Appearance.wallpaperColours(LocalContext.current).collectAsState()

    return on

}