refactor: better project structure (#35)

This project is starting to grow, and I've seen flaws in the initial
project structure design
I think I'll restructure the entire project directory for better
scalability and also cleaner

root/update_test.go

@@ -0,0 +1,64 @@
+package root
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/versenilvis/iris/internal/config"
+)
+
+func TestIsNewer(t *testing.T) {
+	tests := []struct {
+		current string
+		latest  string
+		want    bool
+	}{
+		{"v1.0.0", "v1.0.1", true},
+		{"v1.0.1", "v1.0.0", false},
+		{"v1.0.0", "v1.0.0", false},
+		{"v1.2.3", "v1.2.4", true},
+		{"v1.2.0", "v1.1.9", false},
+		{"dev", "v1.0.0", false}, // dev never updates
+		{"v1.0.0", "dev", false},
+		{"", "v1.0.0", false},
+		{"v1.0.0", "v1.1.0-nightly.8cb1f47", false}, // nightly never triggers update
+		{"v1.1.0-nightly.abc", "v1.2.0", true},      // but if you are on nightly, you can update to stable
+	}
+
+	for _, tt := range tests {
+		if got := IsNewer(tt.current, tt.latest); got != tt.want {
+			t.Errorf("IsNewer(%q, %q) = %v; want %v", tt.current, tt.latest, got, tt.want)
+		}
+	}
+}
+
+func TestUpdateState(t *testing.T) {
+	// Use a temporary directory for the state file
+	tmpDir, err := os.MkdirTemp("", "iris-test-*")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = os.RemoveAll(tmpDir) }()
+
+	t.Setenv("HOME", tmpDir)
+	t.Setenv("XDG_DATA_HOME", filepath.Join(tmpDir, ".local", "share"))
+
+	state := config.LoadState()
+	state.Updater.SeenVersion = "v1.0.0"
+	state.Updater.LastCheckTime = time.Unix(123456789, 0)
+
+	err = config.SaveState(state)
+	if err != nil {
+		t.Fatalf("failed to save state: %v", err)
+	}
+
+	loaded := config.LoadState()
+	if loaded.Updater.SeenVersion != state.Updater.SeenVersion {
+		t.Errorf("Expected SeenVersion %q, got %q", state.Updater.SeenVersion, loaded.Updater.SeenVersion)
+	}
+	if loaded.Updater.LastCheckTime.Unix() != state.Updater.LastCheckTime.Unix() {
+		t.Errorf("Expected LastCheck %v, got %v", state.Updater.LastCheckTime, loaded.Updater.LastCheckTime)
+	}
+}