package world

// Functional options for primitive creation.
// Defaults are applied first, then user options override.

type PointOpt func(*PointOptions)

type PointOptions struct {
	Priority int
	StyleID  StyleID
	Override StyleOverride
	Class    PointClassID

	HitSlopPx int

	hasStyleID bool
}

func defaultPointOptions() PointOptions {
	return PointOptions{
		Priority: DefaultPriorityPoint,
		StyleID:  StyleIDDefaultPoint,
		Class:    PointClassDefault,
	}
}

func PointWithPriority(p int) PointOpt {
	return func(o *PointOptions) {
		o.Priority = p
	}
}

// PointWithStyleID forces the point to use a pre-registered style.
func PointWithStyleID(id StyleID) PointOpt {
	return func(o *PointOptions) {
		o.StyleID = id
		o.hasStyleID = true
		// Explicit style ID wins over overrides.
		o.Override = StyleOverride{}
	}
}

func PointWithClass(c PointClassID) PointOpt {
	return func(o *PointOptions) { o.Class = c }
}

// PointWithStyleOverride derives a style from default point style and applies overrides.
// If you also set StyleID, StyleID wins.
func PointWithStyleOverride(ov StyleOverride) PointOpt {
	return func(o *PointOptions) {
		o.Override = ov
	}
}

func PointWithHitSlopPx(px int) PointOpt {
	return func(o *PointOptions) { o.HitSlopPx = px }
}

type CircleOpt func(*CircleOptions)

type CircleOptions struct {
	Priority int
	StyleID  StyleID
	Override StyleOverride
	Class    CircleClassID

	HitSlopPx int

	hasStyleID bool
}

func defaultCircleOptions() CircleOptions {
	return CircleOptions{
		Priority: DefaultPriorityCircle,
		StyleID:  StyleIDDefaultCircle,
		Class:    CircleClassDefault,
	}
}

func CircleWithPriority(p int) CircleOpt {
	return func(o *CircleOptions) {
		o.Priority = p
	}
}

func CircleWithStyleID(id StyleID) CircleOpt {
	return func(o *CircleOptions) {
		o.StyleID = id
		o.hasStyleID = true
		o.Override = StyleOverride{}
	}
}

func CircleWithClass(c CircleClassID) CircleOpt {
	return func(o *CircleOptions) { o.Class = c }
}

func CircleWithStyleOverride(ov StyleOverride) CircleOpt {
	return func(o *CircleOptions) {
		o.Override = ov
	}
}

func CircleWithHitSlopPx(px int) CircleOpt {
	return func(o *CircleOptions) { o.HitSlopPx = px }
}

type LineOpt func(*LineOptions)

type LineOptions struct {
	Priority int
	StyleID  StyleID
	Override StyleOverride
	Class    LineClassID

	HitSlopPx int

	hasStyleID bool
}

func defaultLineOptions() LineOptions {
	return LineOptions{
		Priority: DefaultPriorityLine,
		StyleID:  StyleIDDefaultLine,
		Class:    LineClassDefault,
	}
}

func LineWithPriority(p int) LineOpt {
	return func(o *LineOptions) {
		o.Priority = p
	}
}

func LineWithStyleID(id StyleID) LineOpt {
	return func(o *LineOptions) {
		o.StyleID = id
		o.hasStyleID = true
		o.Override = StyleOverride{}
	}
}

func LineWithClass(c LineClassID) LineOpt {
	return func(o *LineOptions) { o.Class = c }
}

func LineWithStyleOverride(ov StyleOverride) LineOpt {
	return func(o *LineOptions) {
		o.Override = ov
	}
}

func LineWithHitSlopPx(px int) LineOpt {
	return func(o *LineOptions) { o.HitSlopPx = px }
}