SubwayTooter-Android-App/app/src/main/java/jp/juggler/util/ViewUtils.kt

package jp.juggler.util

import android.app.Activity
import android.content.Context
import android.content.ContextWrapper
import android.content.SharedPreferences
import android.content.res.ColorStateList
import android.graphics.Color
import android.os.Build
import android.view.View
import android.view.ViewGroup
import android.view.WindowInsetsController
import android.view.WindowManager
import android.view.inputmethod.InputMethodManager
import android.widget.CompoundButton
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.SwitchCompat
import jp.juggler.subwaytooter.App1
import jp.juggler.subwaytooter.Pref
import jp.juggler.subwaytooter.R
import org.xmlpull.v1.XmlPullParser
import kotlin.math.pow

private val log = LogCategory("ViewUtils")

fun View?.scan(callback : (view : View) -> Unit) {
	this ?: return
	callback(this)
	if(this is ViewGroup) {
		for(i in 0 until this.childCount) {
			this.getChildAt(i)?.scan(callback)
		}
	}
}

val View?.activity : Activity?
	get() {
		var context = this?.context
		while(context is ContextWrapper) {
			if(context is Activity) return context
			context = context.baseContext
		}
		return null
	}

fun View.hideKeyboard() {
	try {
		val imm = this.context?.getSystemService(Context.INPUT_METHOD_SERVICE)
		if(imm is InputMethodManager) {
			imm.hideSoftInputFromWindow(this.windowToken, InputMethodManager.HIDE_NOT_ALWAYS)
		} else {
			log.e("hideKeyboard: can't get InputMethodManager")
		}
	} catch(ex : Throwable) {
		log.trace(ex)
	}
}

fun View.showKeyboard() {
	try {
		val imm = this.context?.getSystemService(Context.INPUT_METHOD_SERVICE)
		if(imm is InputMethodManager) {
			imm.showSoftInput(this, InputMethodManager.HIDE_NOT_ALWAYS)
		} else {
			log.e("showKeyboard: can't get InputMethodManager")
		}
	} catch(ex : Throwable) {
		log.trace(ex)
	}
}

// set visibility VISIBLE or GONE
// return true if visible
fun <T : View> T?.vg(visible : Boolean) : T? {
	this?.visibility = if(visible) View.VISIBLE else View.GONE
	return if(visible) this else null
}

fun ViewGroup.generateLayoutParamsEx() : ViewGroup.LayoutParams? =
	try {
		val parser = resources.getLayout(R.layout.generate_params)
		// Skip everything until the view tag.
		while(true) {
			val token = parser.nextToken()
			if(token == XmlPullParser.START_TAG) break
		}
		generateLayoutParams(parser)
	} catch(ex : Throwable) {
		log.e(ex, "generateLayoutParamsEx failed")
		null
	}

// isChecked with skipping animation
var CompoundButton.isCheckedNoAnime : Boolean
	get() = isChecked
	set(value) {
		isChecked = value
		jumpDrawablesToCurrentState()
	}

private fun mixColor(col1 : Int, col2 : Int) : Int = Color.rgb(
	(Color.red(col1) + Color.red(col2)) ushr 1,
	(Color.green(col1) + Color.green(col2)) ushr 1,
	(Color.blue(col1) + Color.blue(col2)) ushr 1
)

fun Context.setSwitchColor(
	pref : SharedPreferences,
	root : View?
) {
	val colorBg = attrColor(R.attr.colorWindowBackground)
	val colorOn = Pref.ipSwitchOnColor(pref)
	val colorOff = /* Pref.ipSwitchOffColor(pref).notZero() ?: */
		attrColor(android.R.attr.colorPrimary)
	
	val colorDisabled = mixColor(colorBg, colorOff)
	
	val colorTrackDisabled = mixColor(colorBg, colorDisabled)
	val colorTrackOn = mixColor(colorBg, colorOn)
	val colorTrackOff = mixColor(colorBg, colorOff)
	
	// https://stackoverflow.com/a/25635526/9134243
	val thumbStates = ColorStateList(
		arrayOf(
			intArrayOf(- android.R.attr.state_enabled),
			intArrayOf(android.R.attr.state_checked),
			intArrayOf()
		),
		intArrayOf(
			colorDisabled,
			colorOn,
			colorOff
		)
	)
	
	val trackStates = ColorStateList(
		arrayOf(
			intArrayOf(- android.R.attr.state_enabled),
			intArrayOf(android.R.attr.state_checked),
			intArrayOf()
		),
		intArrayOf(
			colorTrackDisabled,
			colorTrackOn,
			colorTrackOff
		)
	)
	
	root?.scan {
		(it as? SwitchCompat)?.apply {
			thumbTintList = thumbStates
			trackTintList = trackStates
		}
	}
}

private fun rgbToLab(rgb : Int) : Triple<Float, Float, Float> {
	
	fun Int.revGamma() : Float {
		val v = toFloat() / 255f
		return when {
			v > 0.04045f -> ((v + 0.055f) / 1.055f).pow(2.4f)
			else -> v / 12.92f
		}
	}
	
	val r = Color.red(rgb).revGamma()
	val g = Color.green(rgb).revGamma()
	val b = Color.blue(rgb).revGamma()
	
	//https://en.wikipedia.org/wiki/Lab_color_space#CIELAB-CIEXYZ_conversions
	
	fun f(src : Float, k : Float) : Float {
		val v = src * k
		return when {
			v > 0.008856f -> v.pow(1f / 3f)
			else -> (7.787f * v) + (4f / 29f)
		}
	}
	
	val x = f(r * 0.4124f + g * 0.3576f + b * 0.1805f, 100f / 95.047f)
	val y = f(r * 0.2126f + g * 0.7152f + b * 0.0722f, 100f / 100f)
	val z = f(r * 0.0193f + g * 0.1192f + b * 0.9505f, 100f / 108.883f)
	
	return Triple(
		(116 * y) - 16, // L
		500 * (x - y), // a
		200 * (y - z) //b
	)
}

fun AppCompatActivity.setStatusBarColor(forceDark : Boolean = false) {
	
	window?.apply {
		
		// 古い端末ではナビゲーションバーのアイコン色を設定できないため
		// メディアビューア画面ではステータスバーやナビゲーションバーの色を設定しない…
		if(forceDark && Build.VERSION.SDK_INT < 26) return
		
		if(Build.VERSION.SDK_INT < 30) {
			@Suppress("DEPRECATION")
			clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS or WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION)
		}
		
		addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
		
		var c = when {
			forceDark -> Color.BLACK
			else -> Pref.ipStatusBarColor(App1.pref).notZero()
				?: attrColor(R.attr.colorPrimaryDark)
		}
		statusBarColor = c or Color.BLACK
		
		if(Build.VERSION.SDK_INT >= 30) {
			decorView.windowInsetsController?.run {
				val bit = WindowInsetsController.APPEARANCE_LIGHT_STATUS_BARS
				setSystemBarsAppearance(if(rgbToLab(c).first >= 50f) bit else 0, bit)
			}
		} else if(Build.VERSION.SDK_INT >= 23) {
			@Suppress("DEPRECATION")
			val bit = View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
			@Suppress("DEPRECATION")
			decorView.systemUiVisibility =
				if(rgbToLab(c).first >= 50f) {
					//Dark Text to show up on your light status bar
					decorView.systemUiVisibility or bit
				} else {
					//Light Text to show up on your dark status bar
					decorView.systemUiVisibility and bit.inv()
				}
		}
		
		c = when {
			forceDark -> Color.BLACK
			else -> Pref.ipNavigationBarColor(App1.pref)
		}
		
		if(c != 0) {
			navigationBarColor = c or Color.BLACK
			
			if(Build.VERSION.SDK_INT >= 30) {
				decorView.windowInsetsController?.run {
					val bit = WindowInsetsController.APPEARANCE_LIGHT_NAVIGATION_BARS
					setSystemBarsAppearance(if(rgbToLab(c).first >= 50f) bit else 0, bit)
				}
			} else if(Build.VERSION.SDK_INT >= 26) {
				@Suppress("DEPRECATION")
				val bit = View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR
				@Suppress("DEPRECATION")
				decorView.systemUiVisibility =
					if(rgbToLab(c).first >= 50f) {
						//Dark Text to show up on your light status bar
						decorView.systemUiVisibility or bit
					} else {
						//Light Text to show up on your dark status bar
						decorView.systemUiVisibility and bit.inv()
					}
			}
		} // else: need restart app.
	}
}