package qrcode

import (
	"bytes"
	"strings"
	"testing"
)

func TestEncodeSVG_Basics(t *testing.T) {
	svg, err := EncodeSVG("https://atmoquest/c/did:plc:abc", DefaultOptions())
	if err != nil {
		t.Fatalf("EncodeSVG: %v", err)
	}
	s := string(svg)

	if !strings.HasPrefix(s, "<svg ") {
		t.Errorf("SVG should start with <svg, got: %.40s", s)
	}
	if !strings.Contains(s, `xmlns="http://www.w3.org/2000/svg"`) {
		t.Error("missing xmlns")
	}
	if !strings.Contains(s, "viewBox=") {
		t.Error("missing viewBox")
	}
	if !strings.Contains(s, `role="img"`) {
		t.Error("missing accessibility role")
	}
	if !strings.Contains(s, "</svg>") {
		t.Error("missing closing tag")
	}
}

func TestEncodeSVG_DeterministicForSameInput(t *testing.T) {
	a, err := EncodeSVG("https://atmoquest/c/did:plc:abc", DefaultOptions())
	if err != nil {
		t.Fatalf("first encode: %v", err)
	}
	b, err := EncodeSVG("https://atmoquest/c/did:plc:abc", DefaultOptions())
	if err != nil {
		t.Fatalf("second encode: %v", err)
	}
	if !bytes.Equal(a, b) {
		t.Error("same input produced different SVG bytes")
	}
}

func TestEncodeSVG_ContentChangesShape(t *testing.T) {
	a, _ := EncodeSVG("aaaa", DefaultOptions())
	b, _ := EncodeSVG("bbbb", DefaultOptions())
	if bytes.Equal(a, b) {
		t.Error("different content produced identical SVG")
	}
}

func TestEncodeSVG_CustomColors(t *testing.T) {
	opts := DefaultOptions()
	opts.Foreground = "#ff00ff"
	opts.Background = "#00ff00"
	svg, err := EncodeSVG("test", opts)
	if err != nil {
		t.Fatalf("EncodeSVG: %v", err)
	}
	s := string(svg)
	if !strings.Contains(s, "#ff00ff") || !strings.Contains(s, "#00ff00") {
		t.Errorf("custom colors not present: %s", s[:200])
	}
}

func TestEncodeSVG_DefaultsApplied(t *testing.T) {
	// Pass an empty options struct; defaults should be filled in and no
	// error.
	svg, err := EncodeSVG("hello", SVGOptions{})
	if err != nil {
		t.Fatalf("EncodeSVG with empty opts: %v", err)
	}
	s := string(svg)
	if !strings.Contains(s, "#11111b") {
		t.Errorf("expected default foreground #11111b in SVG; got: %.200s", s)
	}
	if !strings.Contains(s, "#cdd6f4") {
		t.Errorf("expected default background #cdd6f4 in SVG; got: %.200s", s)
	}
}