package imglib

import (
	"image"
	"image/color"
	"testing"

	"github.com/golang/freetype"
	"golang.org/x/image/draw"
)

// TestAddChineseWatermark 给桌面 kbk.png 添加中文文字水印
func TestAddChineseWatermark(t *testing.T) {
	srcPath := `C:\Users\Administrator\Desktop\kbk.png`

	srcImg, _, err := NewImageInputFromFile(srcPath).Load()
	if err != nil {
		t.Fatalf("加载源图片失败: %v", err)
	}

	bounds := srcImg.Bounds()
	dst := image.NewRGBA(bounds)
	draw.Draw(dst, bounds, srcImg, bounds.Min, draw.Src)

	font, err := GetFont()
	if err != nil {
		t.Skipf("获取字体失败: %v", err)
	}

	c := freetype.NewContext()
	c.SetDPI(72)
	c.SetFont(font)
	c.SetClip(dst.Bounds())
	c.SetDst(dst)

	fontSize := 36.0
	c.SetFontSize(fontSize)

	text := "这是一个水印"
	x := bounds.Dx() - 280
	y := bounds.Dy() - 60

	c.SetSrc(image.NewUniform(color.RGBA{0, 0, 0, 180}))
	pt := freetype.Pt(x, y)
	if _, err := c.DrawString(text, pt); err != nil {
		t.Fatalf("绘制水印失败: %v", err)
	}

	outPath := "d:\\source\\daShangDao_utils\\kbk_watermarked.png"
	err = SavePNG(dst, outPath)
	if err != nil {
		t.Fatalf("保存图片失败: %v", err)
	}
	t.Logf("水印图片已保存到: %s", outPath)
}