package gstreamer

import (
	"fmt"
	"github.com/rs/zerolog"
	"github.com/tinyzimmer/go-gst/gst"
	"time"
)

func (o *ImageOverlay) create(log zerolog.Logger) (*gst.Element, error) {
	element, err := gst.NewElementWithName("gdkpixbufoverlay", o.Name)
	if err != nil {
		log.Error().Msgf("could not create image overlay %s: %v\n", o.Name, err)
		return nil, fmt.Errorf("could not create image overlay %s", o.Name)
	}
	setPropertyWrapper(element, "positioning-mode", 1) // pixels-absolute
	setPropertyWrapper(element, "location", o.Path)

	o.update(log)
	o.element = element

	return element, err
}

func (o *ImageOverlay) update(_ zerolog.Logger) {
	setPropertyWrapper(o.element, "offset-x", o.X)
	setPropertyWrapper(o.element, "offset-y", o.Y)

	if o.Display {
		o.show()
	} else {
		o.hide()
	}
}

func (o *ImageOverlay) show() gst.ClockCallback {
	return func(clock *gst.Clock, clockTime time.Duration) bool {
		setPropertyWrapper(o.element, "alpha", 1)
		return true
	}
}

func (o *ImageOverlay) hide() gst.ClockCallback {
	return func(clock *gst.Clock, clockTime time.Duration) bool {
		setPropertyWrapper(o.element, "alpha", 0)
		return true
	}
}

func (o *ImageOverlay) getName() string {
	return o.Name
}

func (o *ImageOverlay) getBlendInTime() time.Duration {
	return o.BlendIn
}

func (o *ImageOverlay) getBlendOutTime() time.Duration {
	return o.BlendOut
}

func (o *ImageOverlay) getElement() *gst.Element {
	return o.element
}

func (o *ImageOverlay) setElement(element *gst.Element) {
	o.element = element
}

func (o *ImageOverlay) getType() string {
	return "imageoverlay"
}