package topology

import (
	"os/exec"
	"strings"
	"testing"
)

func TestRenderSVGIncludesTopologyNodesAndDirectedEdge(t *testing.T) {
	servers := []map[string]string{
		{"ServerID": "commit", "Services": "commit-server", "Address": "commit.example.com:1666"},
		{"ServerID": "edge", "Services": "edge-server", "Address": "edge.example.com:1666"},
	}
	records := []map[string]string{{"ServerID": "edge", "TargetServerID": "commit"}}

	svg, err := RenderSVG("Test topology", servers, records)
	if err != nil {
		t.Fatalf("RenderSVG() error = %v", err)
	}
	for _, expected := range []string{
		"<svg", "Test topology", "commit", "edge", "marker-end:url(#arrow)",
		"data-source=\"edge\"", "data-id=\"commit\"", "id=\"save-button\"",
		"function refreshEdges()", "function saveDiagram()",
	} {
		if !strings.Contains(svg, expected) {
			t.Errorf("RenderSVG() did not contain %q", expected)
		}
	}
}

func TestRenderNormalizedSVGIncludesServerDetailsAndHostNodes(t *testing.T) {
	servers := []Server{
		{ServerID: "commit", ServerType: "commit-server"},
		{ServerID: "edge", ServerType: "edge-server", Host: "edge.example.com", Port: "1666", Target: "commit", Version: "P4D/2026.1", Notes: []string{"test edge"}},
	}

	svg, err := RenderNormalizedSVG("Test topology", servers)
	if err != nil {
		t.Fatalf("RenderNormalizedSVG() error = %v", err)
	}
	for _, expected := range []string{
		"p4server: edge", "type: edge-server", "port: 1666", "target: commit", "version: P4D/2026.1", "note: test edge",
		"host-edge", "address: edge.example.com", "edge host-edge",
	} {
		if !strings.Contains(svg, expected) {
			t.Errorf("RenderNormalizedSVG() did not contain %q", expected)
		}
	}
}

func TestRenderNormalizedSVGHandlesCyclesAndDisconnectedComponents(t *testing.T) {
	servers := []Server{
		{ServerID: "root-a", ServerType: "commit-server"},
		{ServerID: "edge-a", ServerType: "edge-server", Target: "root-a"},
		{ServerID: "root-b", ServerType: "commit-server"},
		{ServerID: "edge-b", ServerType: "edge-server", Target: "root-b"},
		{ServerID: "cycle-a", ServerType: "broker", Target: "cycle-b"},
		{ServerID: "cycle-b", ServerType: "broker", Target: "cycle-a"},
	}

	svg, err := RenderNormalizedSVG("Test topology", servers)
	if err != nil {
		t.Fatalf("RenderNormalizedSVG() error = %v", err)
	}
	for _, id := range []string{"root-a", "edge-a", "root-b", "edge-b", "cycle-a", "cycle-b"} {
		if !strings.Contains(svg, "data-id=\""+id+"\"") {
			t.Errorf("RenderNormalizedSVG() did not render %q", id)
		}
	}
}

func TestRenderNormalizedSVGWithSFDPLayout(t *testing.T) {
	if _, err := exec.LookPath("sfdp"); err != nil {
		t.Skip("Graphviz sfdp is not installed")
	}
	servers := []Server{
		{ServerID: "commit", ServerType: "commit-server"},
		{ServerID: "edge-a", ServerType: "edge-server", Target: "commit"},
		{ServerID: "edge-b", ServerType: "edge-server", Target: "commit"},
	}

	svg, err := RenderNormalizedSVGWithLayout("Test topology", servers, "sfdp")
	if err != nil {
		t.Fatalf("RenderNormalizedSVGWithLayout() error = %v", err)
	}
	for _, id := range []string{"commit", "edge-a", "edge-b", "host-commit"} {
		if !strings.Contains(svg, "data-id=\""+id+"\"") {
			t.Errorf("SFDP SVG did not render %q", id)
		}
	}
}