package main

import (
	"image"
	_ "image/jpeg"
	_ "image/png" //I'm needed
	"math"
	"os"

	"github.com/kenshaw/escpos"
	"github.com/kenshaw/escpos/raster"
)

// var ditherers []dither.Dither = []dither.Dither{
// 	dither.Dither{
// 		"FloydSteinberg",
// 		dither.Settings{
// 			[][]float32{
// 				[]float32{0.0, 0.0, 0.0, 7.0 / 48.0, 5.0 / 48.0},
// 				[]float32{3.0 / 48.0, 5.0 / 48.0, 7.0 / 48.0, 5.0 / 48.0, 3.0 / 48.0},
// 				[]float32{1.0 / 48.0, 3.0 / 48.0, 5.0 / 48.0, 3.0 / 48.0, 1.0 / 48.0},
// 			},
// 		},
// 	},
// 	dither.Dither{
// 		"Stucki",
// 		dither.Settings{
// 			[][]float32{
// 				[]float32{0.0, 0.0, 0.0, 8.0 / 42.0, 4.0 / 42.0},
// 				[]float32{2.0 / 42.0, 4.0 / 42.0, 8.0 / 42.0, 4.0 / 42.0, 2.0 / 42.0},
// 				[]float32{1.0 / 42.0, 2.0 / 42.0, 4.0 / 42.0, 2.0 / 42.0, 1.0 / 42.0},
// 			},
// 		},
// 	},
// 	dither.Dither{
// 		"Atkinson",
// 		dither.Settings{
// 			[][]float32{
// 				[]float32{0.0, 0.0, 1.0 / 8.0, 1.0 / 8.0},
// 				[]float32{1.0 / 8.0, 1.0 / 8.0, 1.0 / 8.0, 0.0},
// 				[]float32{0.0, 1.0 / 8.0, 0.0, 0.0},
// 			},
// 		},
// 	},
// 	dither.Dither{
// 		"Burkes",
// 		dither.Settings{
// 			[][]float32{
// 				[]float32{0.0, 0.0, 0.0, 8.0 / 32.0, 4.0 / 32.0},
// 				[]float32{2.0 / 32.0, 4.0 / 32.0, 8.0 / 32.0, 4.0 / 32.0, 2.0 / 32.0},
// 				[]float32{0.0, 0.0, 0.0, 0.0, 0.0},
// 			},
// 		},
// 	},
// 	dither.Dither{
// 		"Sierra-3",
// 		dither.Settings{
// 			[][]float32{
// 				[]float32{0.0, 0.0, 0.0, 5.0 / 32.0, 3.0 / 32.0},
// 				[]float32{2.0 / 32.0, 4.0 / 32.0, 5.0 / 32.0, 4.0 / 32.0, 2.0 / 32.0},
// 				[]float32{0.0, 2.0 / 32.0, 3.0 / 32.0, 2.0 / 32.0, 0.0},
// 			},
// 		},
// 	},
// 	dither.Dither{
// 		"Sierra-2",
// 		dither.Settings{
// 			[][]float32{
// 				[]float32{0.0, 0.0, 0.0, 4.0 / 16.0, 3.0 / 16.0},
// 				[]float32{1.0 / 16.0, 2.0 / 16.0, 3.0 / 16.0, 2.0 / 16.0, 1.0 / 16.0},
// 				[]float32{0.0, 0.0, 0.0, 0.0, 0.0},
// 			},
// 		},
// 	},
// 	dither.Dither{
// 		"Sierra-Lite",
// 		dither.Settings{
// 			[][]float32{
// 				[]float32{0.0, 0.0, 2.0 / 4.0},
// 				[]float32{1.0 / 4.0, 1.0 / 4.0, 0.0},
// 				[]float32{0.0, 0.0, 0.0},
// 			},
// 		},
// 	},
// }

const ESC = byte(27)

func pageWidth(widht int) []byte {
	return []byte{escpos.GS, 87, byte(widht), 0}
}
func pageMargin(margin int) []byte {
	return []byte{escpos.GS, 76, byte(margin), 0}
}
func pageMode() []byte {
	return []byte{ESC, 'L'}
}
func pageDirection(direction uint8) []byte {
	// https://www.epson-biz.com/modules/ref_escpos/index.php?content_id=55
	return []byte{ESC, 'T', direction}
}
func pagePrintArea(x, y, width, height int) []byte {
	return []byte{ESC, 'W',
		byte(x & 255), byte(x >> 8 & 255),
		byte(y & 255), byte(y >> 8 & 255),
		byte(width & 255), byte(width >> 8 & 255),
		byte(height & 255), byte(height >> 8 & 255)}
}
func offsetY(offset int) []byte {
	// A positive number specifies movement downward, and a negative number specifies movement upward.
	// The horizontal or vertical motion unit is used for the print direction set by ESC T.
	// When the starting position is set to the upper left or lower right of the print area using ESC T, the vertical motion unit is used.
	// When the starting position is set to the upper right or lower left of the print area using ESC T, the horizontal motion unit is used.
	return []byte{escpos.GS, '\\', byte(offset & 255), byte(offset >> 8 & 255)}
}
func offsetX(offset int) []byte {
	// A positive number specifies movement to the right, and a negative number specifies movement to the left.
	// When Standard mode is selected, the horizontal motion unit is used.
	// when Page mode is selected, the horizontal or vertical motion unit is used for the print direction set by ESC T.
	// When the starting position is set to the upper left or lower right of the print area using ESC T, the horizontal motion unit is used.
	// When the starting position is set to the upper right or lower left of the print area using ESC T, the vertical motion unit is used.
	return []byte{ESC, '\\', byte(offset & 255), byte(offset >> 8 & 255)}
}
func invert(n int) []byte {
	//When the LSB of n is 0, white/black reverse print mode is turned off.
	//n = 0 – 255
	return []byte{escpos.GS, byte('B'), byte(n)}
}
func disableSensors() []byte {
	return []byte{ESC, 'c', '3', 0}
}
func printSpeed(m int) []byte {
	// 	m = 0 – 9, 48 – 57 : slowest - fastest
	//  m = 0 - 13 : slowest - fastest version V
	// [Default] 0 = Setting value of GS ( E   <Function 5> customize value (a = 6)
	// m = 0
	//Slower print speed seems to retain a bit more quality in dithered images. pure B/W images do not have a noticable difference
	return []byte{escpos.GS, '(', 'K', 2, 0, 50, byte(m & 255), byte(m >> 8 & 255)}
}

func main() {
	f, err := os.OpenFile("/dev/usb/lp0", os.O_WRONLY|os.O_CREATE, 0)
	if err != nil {
		panic(err)
	}
	defer f.Close()

	//load image
	imagef, err := os.Open("kia.png")
	if err != nil {
		panic(err)
	}
	defer imagef.Close()
	img, _, err := image.Decode(imagef)

	ep := escpos.New(f)

	ep.Init()
	ep.WriteRaw(pageWidth(int(math.Round((29.0 / 80.0) * 512))))
	ep.WriteRaw(pageMargin(1))
	ep.WriteRaw(printSpeed(13))
	// ditherer := ditherers[1]
	// log.Println("Using ditherer type: " + ditherer.Type)

	// dg := ditherer.Monochrome(img, 1.18)
	rasterConv := &raster.Converter{
		MaxWidth:  186, // == math.Round((29.0 / 80.0) * 512)) == 29mm sticker roll
		Threshold: 0.1, //pre-dithered images are black or white anyway, so this can be extremely low as there won't be any in-between colors (default: 0.5)
	}
	for i := 0; i < 2; i++ {
		rasterConv.Print(img, ep)
		ep.Cut()
	}

	//ep.WriteRaw([]byte{12}) // FF: in Page mode, prints all the data in the print buffer collectively and switches from Page mode to Standard mode.
	//ep.Formfeed()

	ep.End()

}