From d14eec2346ba994d119ec5d83713866d12be5cc5 Mon Sep 17 00:00:00 2001
From: Purefin Dev <dev@purefin.app>
Date: Fri, 22 May 2026 16:41:58 +0000
Subject: [PATCH] feat(player): add adaptive brightness mode support

Extend the brightness slider to allow values below 0% which triggers
adaptive/auto brightness mode (screenBrightness = -1.0f). The brightness
indicator shows 'Auto' with an empty bar when in adaptive mode.

- Widen gesture range from [0,1] to [-0.1,1] so a small flick below 0 enters auto mode
- readCurrentBrightness returns -0.1f instead of 0.5f when system auto is active
- applyBrightness writes -1f to LayoutParams when value < 0
- PlayerAdjustmentIndicator displays 'Auto' in tertiary color for negative values
---
 .../hu/bbara/purefin/ui/screen/player/PlayerScreen.kt     | 8 +++++---
 .../screen/player/components/PlayerAdjustmentIndicator.kt | 8 +++++---
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/app/src/main/java/hu/bbara/purefin/ui/screen/player/PlayerScreen.kt b/app/src/main/java/hu/bbara/purefin/ui/screen/player/PlayerScreen.kt
index a33c0889..dc0aa188 100644
--- a/app/src/main/java/hu/bbara/purefin/ui/screen/player/PlayerScreen.kt
+++ b/app/src/main/java/hu/bbara/purefin/ui/screen/player/PlayerScreen.kt
@@ -64,6 +64,8 @@ import kotlin.math.roundToInt
 
 private const val CONTROLS_VISIBLE_SUBTITLE_BOTTOM_PADDING_FRACTION = 0.32f
 private const val WIDE_VIDEO_ASPECT_RATIO = 16f / 9f
+/** Small negative band below zero that represents adaptive/auto brightness mode. */
+private const val AUTO_BRIGHTNESS_SENTINEL = -0.1f
 
 @OptIn(UnstableApi::class)
 @Composable
@@ -148,7 +150,7 @@ fun PlayerScreen(
             onDoubleTapCenter = { viewModel.togglePlayPause() },
             onVerticalDragLeft = { delta ->
                 val diff = (-delta / 800f)
-                brightness = (brightness + diff).coerceIn(0f, 1f)
+                brightness = (brightness + diff).coerceIn(AUTO_BRIGHTNESS_SENTINEL, 1f)
                 applyBrightness(activity, brightness)
             },
             onVerticalDragRight = { delta ->
@@ -400,12 +402,12 @@ private fun formatSeekDelta(deltaMs: Long): String {
 
 private fun readCurrentBrightness(activity: Activity?): Float {
     val current = activity?.window?.attributes?.screenBrightness
-    return if (current != null && current >= 0) current else 0.5f
+    return if (current != null && current >= 0) current else AUTO_BRIGHTNESS_SENTINEL
 }
 
 private fun applyBrightness(activity: Activity?, value: Float) {
     activity ?: return
     val params = activity.window.attributes
-    params.screenBrightness = value
+    params.screenBrightness = if (value < 0f) -1f else value
     activity.window.attributes = params
 }
diff --git a/app/src/main/java/hu/bbara/purefin/ui/screen/player/components/PlayerAdjustmentIndicator.kt b/app/src/main/java/hu/bbara/purefin/ui/screen/player/components/PlayerAdjustmentIndicator.kt
index f6dd4930..b54ea1e8 100644
--- a/app/src/main/java/hu/bbara/purefin/ui/screen/player/components/PlayerAdjustmentIndicator.kt
+++ b/app/src/main/java/hu/bbara/purefin/ui/screen/player/components/PlayerAdjustmentIndicator.kt
@@ -31,7 +31,8 @@ fun PlayerAdjustmentIndicator(
     sliderHeight: Dp = 140.dp,
 ) {
     val scheme = MaterialTheme.colorScheme
-    val percent = (value.coerceIn(0f, 1f) * 100).roundToInt()
+    val isAuto = value < 0f
+    val percent = if (isAuto) 0 else (value * 100).roundToInt()
     val clamped = value.coerceIn(0f, 1f)
 
     Box(
@@ -68,9 +69,10 @@ fun PlayerAdjustmentIndicator(
                 )
             }
             Spacer(modifier = Modifier.height(16.dp))
+            val label = if (isAuto) "Auto" else "$percent%"
             Text(
-                text = "$percent%",
-                color = scheme.onSurface,
+                text = label,
+                color = if (isAuto) scheme.tertiary else scheme.onSurface,
                 style = MaterialTheme.typography.titleMedium
             )
         }