package vision

import (
	"os"
	"testing"
)

func TestCanvas(t *testing.T) {
	c := New(200, 200, "#FFFFFF")
	c.SetColor("#FF0000")
	c.Rect(10, 10, 100, 100, &DrawStyle{
		FillColor: "#00FF00",
		StrokeColor: "#0000FF",
		StrokeWidth: 2,
	})
	
	err := Save(c, "test.png")
	if err != nil {
		t.Fatalf("save failed: %v", err)
	}
	defer os.Remove("test.png")
}

func TestCaptcha(t *testing.T) {
	c := GenerateCaptcha(&CaptchaOption{
		Length: 6,
		Width: 200,
		Height: 60,
	})
	
	err := Save(c, "captcha.png")
	if err != nil {
		t.Fatalf("save captcha failed: %v", err)
	}
	defer os.Remove("captcha.png")
}

func TestColorPalette(t *testing.T) {
	c := New(100, 100, "#FF0000")
	c.Rect(0, 0, 50, 100, &DrawStyle{FillColor: "#00FF00"})
	
	palette := c.ExtractPalette(5)
	if len(palette) < 2 {
		t.Errorf("expected at least 2 colors, got %d", len(palette))
	}
	t.Logf("palette: %+v", palette)
}

func TestPHash(t *testing.T) {
	c1 := New(100, 100, "#FFFFFF")
	c1.Circle(50, 50, 30, &DrawStyle{FillColor: "#000000"})
	
	c2 := New(100, 100, "#FFFFFF")
	c2.Circle(52, 52, 30, &DrawStyle{FillColor: "#000000"}) // 稍微偏移
	
	h1 := PHash(c1.Image())
	h2 := PHash(c2.Image())
	
	dist := Distance(h1, h2)
	if dist > 5 {
		t.Errorf("expected small distance for similar images, got %d", dist)
	}
	t.Logf("pHash distance: %d", dist)
}

func TestQRCode(t *testing.T) {
	content := "https://apigo.cc"
	c, err := GenerateQRCode(content, 200)
	if err != nil {
		t.Fatalf("generate qrcode failed: %v", err)
	}
	
	decoded, err := c.DecodeQRCode()
	if err != nil {
		t.Fatalf("decode qrcode failed: %v", err)
	}
	if decoded != content {
		t.Errorf("expected %s, got %s", content, decoded)
	}
}

func TestBarcode(t *testing.T) {
	content := "12345678"
	c, err := GenerateBarcode(content, 200, 50)
	if err != nil {
		t.Fatalf("generate barcode failed: %v", err)
	}
	
	decoded, err := c.DecodeBarcode()
	if err != nil {
		t.Fatalf("decode barcode failed: %v", err)
	}
	if decoded != content {
		t.Errorf("expected %s, got %s", content, decoded)
	}
}