package drawer

import (
	"image"
	"sync"

	"gitea.unprism.ru/yotia/display-test/display"

	"golang.org/x/image/font"
	"golang.org/x/image/font/inconsolata"
)

type drawer struct {
	font font.Face

	dev      display.Display
	img      *image.Gray
	imgMutex sync.Mutex
}

type Drawer interface {
	GetFont() font.Face

	// Lowlevel image
	GetImg() *image.Gray
	Lock()
	Unlock()

	Clear()
	Flush() error

	PutText(x, y int, text string)

	PutBar(x0, y0, x1, y1, color int)
	FillBar(x0, y0, x1, y1, color int)
}

func New(dev display.Display) Drawer {
	return &drawer{
		font: inconsolata.Regular8x16,

		dev: dev,
		img: image.NewGray(dev.GetBounds()),
	}
}

func (d *drawer) GetImg() *image.Gray {
	return d.img
}

func (d *drawer) GetFont() font.Face {
	return d.font
}

func (d *drawer) Lock() {
	d.imgMutex.Lock()
}

func (d *drawer) Unlock() {
	d.imgMutex.Unlock()
}

func (d *drawer) Clear() {
	d.Lock()
	defer d.Unlock()

	for i := range d.img.Pix {
		d.img.Pix[i] = 0
	}
}

func (d *drawer) Flush() error {
	d.Lock()
	defer d.Unlock()

	return d.dev.Flush(d.img)
}