package cli

import (
	"strings"
	"testing"

	"git.eeqj.de/sneak/vaultik/internal/config"
	"gopkg.in/yaml.v3"
)

// TestDefaultConfigTemplateParses ensures the init template is valid YAML
// that unmarshals into the Config struct with the expected snapshots.
func TestDefaultConfigTemplateParses(t *testing.T) {
	var cfg config.Config
	if err := yaml.Unmarshal([]byte(defaultConfigTemplate), &cfg); err != nil {
		t.Fatalf("default config template is not valid YAML: %v", err)
	}

	if len(cfg.AgeRecipients) != 1 {
		t.Errorf("expected 1 placeholder age recipient, got %d", len(cfg.AgeRecipients))
	}

	home, ok := cfg.Snapshots["home"]
	if !ok {
		t.Fatal("expected 'home' snapshot in default config")
	}
	if len(home.Paths) == 0 {
		t.Error("home snapshot should have at least one path")
	}
	if len(home.Exclude) == 0 {
		t.Error("home snapshot should have exclude patterns")
	}

	apps, ok := cfg.Snapshots["apps"]
	if !ok {
		t.Fatal("expected 'apps' snapshot in default config")
	}
	if len(apps.Paths) != 1 || apps.Paths[0] != "/Applications" {
		t.Errorf("apps snapshot should back up /Applications, got %v", apps.Paths)
	}
	if len(apps.Exclude) == 0 {
		t.Error("apps snapshot should have exclude patterns")
	}
}

const testYAML = `# top comment
compression_level: 3
s3:
  bucket: oldbucket # inline comment
  region: us-east-1
snapshots:
  home:
    paths:
      - "~"
`

func parseTestYAML(t *testing.T) *yaml.Node {
	t.Helper()
	var root yaml.Node
	if err := yaml.Unmarshal([]byte(testYAML), &root); err != nil {
		t.Fatalf("parsing test yaml: %v", err)
	}
	return &root
}

func TestYAMLPathGet(t *testing.T) {
	root := parseTestYAML(t)

	tests := []struct {
		path string
		want string
		err  bool
	}{
		{"compression_level", "3", false},
		{"s3.bucket", "oldbucket", false},
		{"s3.region", "us-east-1", false},
		{"s3.nonexistent", "", true},
		{"nonexistent", "", true},
		{"compression_level.sub", "", true},
	}

	for _, tt := range tests {
		t.Run(tt.path, func(t *testing.T) {
			node, err := yamlPathGet(root, splitPath(tt.path))
			if tt.err {
				if err == nil {
					t.Fatalf("expected error for %q", tt.path)
				}
				return
			}
			if err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			if node.Value != tt.want {
				t.Errorf("get %q = %q, want %q", tt.path, node.Value, tt.want)
			}
		})
	}
}

func TestYAMLPathSet(t *testing.T) {
	root := parseTestYAML(t)

	// Overwrite existing nested value
	if err := yamlPathSet(root, splitPath("s3.bucket"), "newbucket"); err != nil {
		t.Fatalf("set s3.bucket: %v", err)
	}

	// Create new nested key with intermediate map
	if err := yamlPathSet(root, splitPath("s3.endpoint"), "s3.example.com"); err != nil {
		t.Fatalf("set s3.endpoint: %v", err)
	}
	if err := yamlPathSet(root, splitPath("newmap.newkey"), "val"); err != nil {
		t.Fatalf("set newmap.newkey: %v", err)
	}

	// Round-trip and verify values + comment preservation
	out, err := yaml.Marshal(root)
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}
	text := string(out)

	for _, want := range []string{"newbucket", "s3.example.com", "newkey: val", "# top comment", "# inline comment"} {
		if !contains(text, want) {
			t.Errorf("round-tripped YAML missing %q:\n%s", want, text)
		}
	}

	got, err := yamlPathGet(root, splitPath("s3.bucket"))
	if err != nil {
		t.Fatalf("get after set: %v", err)
	}
	if got.Value != "newbucket" {
		t.Errorf("s3.bucket = %q after set, want newbucket", got.Value)
	}
}

func splitPath(s string) []string {
	return strings.Split(s, ".")
}

func contains(haystack, needle string) bool {
	return strings.Contains(haystack, needle)
}