import org.openrndr.application
import org.openrndr.extra.expressions.evaluateExpression
import org.openrndr.extra.gui.GUI
import org.openrndr.extra.gui.addTo
import org.openrndr.extra.parameters.TextParameter

fun main() = application {
    program {
        val gui = GUI()
        gui.compartmentsCollapsedByDefault = false

        val settings = object {
            @TextParameter("x expression", order = 10)
            var xExpression = "cos(t) * 50.0 + width / 2.0"

            @TextParameter("y expression", order = 20)
            var yExpression = "sin(t) * 50.0 + height / 2.0"

            @TextParameter("radius expression", order = 30)
            var radiusExpression = "cos(t) * 50.0 + 50.0"
        }.addTo(gui)

        extend(gui)
        extend {
            //gui.visible = mouse.position.x < 200.0

            val expressionContext =
                mapOf("t" to seconds, "width" to drawer.bounds.width, "height" to drawer.bounds.height)

            fun eval(expression: String): Double =
                try {
                    evaluateExpression(expression, expressionContext) ?: 0.0
                } catch (e: Throwable) {
                    0.0
                }

            val x = eval(settings.xExpression)
            val y = eval(settings.yExpression)
            val radius = eval(settings.radiusExpression)

            drawer.circle(x, y, radius)
        }
    }
}