import org.openrndr.WindowMultisample
import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.draw.DrawPrimitive
import org.openrndr.draw.shadeStyle
import org.openrndr.extra.camera.Orbital
import org.openrndr.extra.meshgenerators.buildTriangleMesh
import org.openrndr.extra.meshgenerators.extrudeShapeSteps
import org.openrndr.extra.shapes.splines.catmullRom
import org.openrndr.extra.shapes.splines.toPath3D
import org.openrndr.math.Vector3
import org.openrndr.shape.Circle
import org.openrndr.shape.Shape

fun main() = application {
    configure {
        width = 720
        height = 720
        multisample = WindowMultisample.SampleCount(8)
    }
    program {
        val m = buildTriangleMesh {
            color = ColorRGBa.PINK

            val path = listOf(
                Vector3(0.0, 0.0, 0.0),
                Vector3(-2.0, 2.0, 2.0),
                Vector3(2.0, -4.0, 4.0),
                Vector3(0.0, 0.0, 8.0)
            ).catmullRom(0.5, closed = false).toPath3D()


            translate(-5.0, 0.0, 0.0)


            val ring = Shape(listOf(Circle(0.0, 0.0, 0.5).contour, Circle(0.0, 0.0, 0.25).contour.reversed))

            for (i in 0 until 5) {
                extrudeShapeSteps(
                    ring,
                    path,
                    160,
                    Vector3.UNIT_Y,
                    contourDistanceTolerance = 0.02,
                    pathDistanceTolerance = 0.001
                )
                translate(2.0, 0.0, 0.0)
            }
        }

        extend(Orbital()) {
            this.eye = Vector3(0.0, 3.0, 7.0)
            this.lookAt = Vector3(0.0, 2.0, 0.0)
        }

        extend {
            drawer.shadeStyle = shadeStyle {
                fragmentTransform = """
                        x_fill = va_color;
                        x_fill.rgb *= v_viewNormal.z;
                    """.trimIndent()
            }

            drawer.vertexBuffer(m, DrawPrimitive.TRIANGLES)
        }
    }
}