Extensions.kt

fun <T> unsafeLazy(initializer: () -> T) = lazy(LazyThreadSafetyMode.NONE, initializer)

@JvmOverloads @Dimension(unit = Dimension.PX) fun Number.dpToPx(
    metrics: DisplayMetrics = Resources.getSystem().displayMetrics
): Float {
    return toFloat() * metrics.density
}

@JvmOverloads @Dimension(unit = Dimension.DP) fun Number.pxToDp(
    metrics: DisplayMetrics = Resources.getSystem().displayMetrics
): Float {
    return toFloat() / metrics.density
}

@ColorInt fun Context.getColorCompat(@ColorRes colorRes: Int): Int {
    return ContextCompat.getColor(this, colorRes)
}

fun Context.getDrawableCompat(@DrawableRes drawableRes: Int): Drawable {
    return AppCompatResources.getDrawable(this, drawableRes)!!
}

@CheckResult fun Drawable.tint(@ColorInt color: Int): Drawable {
    val tintedDrawable = DrawableCompat.wrap(this).mutate()
    DrawableCompat.setTint(tintedDrawable, color)
    return tintedDrawable
}

@CheckResult fun Drawable.tint(context: Context, @ColorRes color: Int): Drawable {
    return tint(context.getColorCompat(color))
}

fun Context.toActivity(): Activity? {
    var context = this
    while (context is ContextWrapper) {
        if (context is Activity) {
            return context
        }
        context = context.baseContext
    }
    return null
}

fun Context.openWebPage(url: String): Boolean {
    // Format the URI properly.
    val uri = url.toWebUri()

    // Try using Chrome Custom Tabs.
    try {
        val intent = CustomTabsIntent.Builder()
            .setToolbarColor(getColorCompat(R.color.primary))
            .setShowTitle(true)
            .build()
        intent.launchUrl(this, uri)
        return true
    } catch (ignored: Exception) {}

    // Fall back to launching a default web browser intent.
    try {
        val intent = Intent(Intent.ACTION_VIEW, uri)
        if (intent.resolveActivity(packageManager) != null) {
            startActivity(intent)
            return true
        }
    } catch (ignored: Exception) {}

    // We were unable to show the web page.
    return false
}

fun String.toWebUri(): Uri {
    return (if (startsWith("http://") || startsWith("https://")) this else "https://$this").toUri()
}