package ui

import "opslag.de/schobers/zntg/allg5"

type Context interface {
	Display() *allg5.Display
	Fonts() Fonts
	Palette() Palette
	Debug() Debug
}

type Debug interface {
	IsEnabled() bool
	Rainbow() allg5.Color
}

var _ Context = &context{}

type context struct {
	disp *allg5.Display
	fts  Fonts
	pal  Palette
	dbg  *debug
}

type debug struct {
	enbl  bool
	rainb []allg5.Color
	col   int
}

func rainbow() []allg5.Color {
	var colors = make([]allg5.Color, len(Colors500))
	for i, c := range Colors500 {
		colors[i] = NewColorAlpha(c, 0x7f)
	}
	return colors
}

func newContext(disp *allg5.Display, f Fonts) *context {
	return &context{disp, f, DefaultPalette(), &debug{rainb: rainbow()}}
}

func (c *context) Display() *allg5.Display {
	return c.disp
}

func (c *context) Fonts() Fonts {
	return c.fts
}

func (c *context) Palette() Palette {
	return c.pal
}

func (c *context) Debug() Debug {
	return c.dbg
}

func (d *debug) IsEnabled() bool {
	return d.enbl
}

func (d *debug) resetRainbow() {
	d.col = 0
}

func (d *debug) Rainbow() allg5.Color {
	var col = d.col
	d.col = (col + 1) % len(d.rainb)
	return d.rainb[col]
}