Initial commit.

internal/config/instance.go

@@ -0,0 +1,83 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// GetWildCLIDataDir returns the Wild CLI data directory
+func GetWildCLIDataDir() string {
+	if dir := os.Getenv("WILD_CLI_DATA"); dir != "" {
+		return dir
+	}
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return ".wildcloud"
+	}
+	return filepath.Join(home, ".wildcloud")
+}
+
+// GetCurrentInstance resolves the current instance using the priority cascade:
+// 1. --instance flag (passed as parameter)
+// 2. $WILD_CLI_DATA/current_instance file
+// 3. Auto-select first instance from API
+func GetCurrentInstance(flagInstance string, apiClient InstanceLister) (string, string, error) {
+	// Priority 1: --instance flag
+	if flagInstance != "" {
+		return flagInstance, "flag", nil
+	}
+
+	// Priority 2: current_instance file
+	dataDir := GetWildCLIDataDir()
+	currentFile := filepath.Join(dataDir, "current_instance")
+
+	if data, err := os.ReadFile(currentFile); err == nil {
+		instance := strings.TrimSpace(string(data))
+		if instance != "" {
+			return instance, "file", nil
+		}
+	}
+
+	// Priority 3: Auto-select first instance from API
+	if apiClient != nil {
+		instances, err := apiClient.ListInstances()
+		if err != nil {
+			return "", "", fmt.Errorf("no instance configured and failed to list instances: %w", err)
+		}
+
+		if len(instances) == 0 {
+			return "", "", fmt.Errorf("no instance configured and no instances available (create one with: wild instance create <name>)")
+		}
+
+		// Auto-select first instance
+		return instances[0], "auto", nil
+	}
+
+	return "", "", fmt.Errorf("no instance configured (use --instance flag or run: wild instance use <name>)")
+}
+
+// SetCurrentInstance persists the instance selection to file
+func SetCurrentInstance(instance string) error {
+	dataDir := GetWildCLIDataDir()
+
+	// Create directory if it doesn't exist
+	if err := os.MkdirAll(dataDir, 0755); err != nil {
+		return fmt.Errorf("failed to create data directory: %w", err)
+	}
+
+	currentFile := filepath.Join(dataDir, "current_instance")
+
+	// Write instance name to file
+	if err := os.WriteFile(currentFile, []byte(instance), 0644); err != nil {
+		return fmt.Errorf("failed to write current instance file: %w", err)
+	}
+
+	return nil
+}
+
+// InstanceLister is an interface for listing instances (allows for testing and dependency injection)
+type InstanceLister interface {
+	ListInstances() ([]string, error)
+}