package solutions.tretter.esunandroid

import android.content.Context
import android.content.Intent
import android.provider.Settings

/**
 * Best-effort detection of Android's built-in Night Light ("Night display").
 *
 * Note: OEM-specific blue light filters may not be detectable.
 */
object NightLight {
    fun isAndroidNightLightEnabled(context: Context): Boolean {
        val cr = context.contentResolver

        // AOSP Night Light
        if (readSecureInt(cr, "night_display_activated") == 1) return true

        // Samsung "Eye comfort shield" / blue light filter (best-effort; OEM keys may vary)
        // Common keys observed on Samsung builds:
        // - blue_light_filter (0/1)
        // NOTE: We intentionally do NOT use *_opacity as a signal, because devices may keep the
        // last-used opacity value even when the feature is turned off.
        if (readSystemInt(cr, "blue_light_filter") == 1) return true

        // Some builds use a different boolean key name.
        if (readSystemInt(cr, "blue_light_filter_enabled") == 1) return true

        return false
    }

    fun nightLightSettingsIntent(): Intent {
        // Night Light settings screen (may not exist on all OEMs)
        return Intent(Settings.ACTION_NIGHT_DISPLAY_SETTINGS)
    }

    fun displaySettingsIntent(): Intent {
        return Intent(Settings.ACTION_DISPLAY_SETTINGS)
    }

    private fun readSecureInt(cr: android.content.ContentResolver, key: String): Int? {
        return runCatching { Settings.Secure.getInt(cr, key) }.getOrNull()
    }

    private fun readSystemInt(cr: android.content.ContentResolver, key: String): Int? {
        return runCatching { Settings.System.getInt(cr, key) }.getOrNull()
    }
}