Fix up options to be more better

main.go

@@ -6,9 +6,10 @@ import (
 	"os"
 	"os/signal"
 
-	logger "git.site.quack-lab.dev/dave/cylogger"
 	wh "go-eve-pi/webhook"
 
+	logger "git.site.quack-lab.dev/dave/cylogger"
+
 	"github.com/fasthttp/router"
 	"github.com/valyala/fasthttp"
 )
@@ -16,7 +17,19 @@ import (
 var webhook wh.Webhook
 
 func main() {
+	// Add flag for generating .env.example
+	help := flag.Bool("help", false, "Generate .env.example file")
 	flag.Parse()
+
+	if *help {
+		if err := GenerateEnvExample(); err != nil {
+			logger.Error("Failed to generate .env.example: %v", err)
+			os.Exit(1)
+		}
+		logger.Info("Generated .env.example file successfully")
+		os.Exit(0)
+	}
+
 	logger.InitFlag()
 	logger.Info("Starting Eve PI")
 
@@ -31,7 +44,7 @@ func main() {
 		return
 	}
 
-	webhook = wh.NewZulipWebhook(options.ZulipURL, options.ZulipEmail, options.ZulipToken)
+	webhook = wh.NewZulipWebhook(options.WebhookURL, options.WebhookEmail, options.WebhookToken)
 
 	// Setup fasthttp router
 	r := router.New()

options.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"os"
+	"reflect"
 	"strings"
 
 	logger "git.site.quack-lab.dev/dave/cylogger"
@@ -21,63 +22,122 @@ func init() {
 }
 
 type Options struct {
-	DBPath string
+	DBPath string `env:"DB_PATH" default:"eve-pi.db" description:"Database file path"`
-	Port   string
+	Port string `env:"HTTP_SERVER_PORT" default:"3000" description:"HTTP server port"`
 
-	ESIScopes      []string
+	ClientID    string   `env:"ESI_CLIENT_ID" required:"true" description:"EVE SSO client ID"`
-	ESIRedirectURI string
+	RedirectURI string   `env:"ESI_REDIRECT_URI" required:"true" description:"EVE SSO redirect URI"`
-	ESIClientID    string
+	Scopes      []string `env:"ESI_SCOPES" default:"esi-planets.manage_planets.v1" description:"EVE SSO scopes (space-separated)"`
 
-	WebhookURL   string
+	WebhookURL   string `env:"WEBHOOK_URL" required:"true" description:"Webhook URL for notifications"`
-	WebhookEmail string
+	WebhookEmail string `env:"WEBHOOK_EMAIL" required:"true" description:"Webhook authentication email"`
-	WebhookToken string
+	WebhookToken string `env:"WEBHOOK_TOKEN" required:"true" description:"Webhook authentication token"`
+
+	LogLevel string `env:"LOG_LEVEL" default:"info" description:"Logging level (debug, info, warning, error)"`
 }
 
 func LoadOptions() (Options, error) {
-	// Load environment variables strictly from .env file (fail if there's an error loading)
+	err := godotenv.Load()
-	if err := godotenv.Load(); err != nil {
+	if err != nil {
-		return Options{}, fmt.Errorf("error loading .env file: %w", err)
+		return Options{}, fmt.Errorf("failed to load environment variables: %w", err)
 	}
 
-	dbPath := getOrDefault("DB_PATH", "eve-pi.db")
+	opts := Options{}
-	port := getOrDefault("HTTP_SERVER_PORT", "3000")
+	optsType := reflect.TypeOf(opts)
+	optsValue := reflect.ValueOf(&opts).Elem()
 
-	clientID := getOrFatal("ESI_CLIENT_ID")
+	for i := 0; i < optsType.NumField(); i++ {
-	redirectURI := getOrFatal("ESI_REDIRECT_URI")
+		field := optsType.Field(i)
-	rawScopes := getOrDefault("ESI_SCOPES", "esi-planets.manage_planets.v1")
+		fieldValue := optsValue.Field(i)
-	scopes := strings.Fields(rawScopes)
 
-	webhookUrl := getOrFatal("WEBHOOK_URL")
+		envKey := field.Tag.Get("env")
-	webhookEmail := getOrFatal("WEBHOOK_EMAIL")
+		if envKey == "" {
-	webhookToken := getOrFatal("WEBHOOK_TOKEN")
+			continue
-
-	return Options{
-		DBPath: dbPath,
-		Port:   port,
-
-		ESIClientID:    clientID,
-		ESIRedirectURI: redirectURI,
-		ESIScopes:      scopes,
-
-		WebhookURL:   webhookUrl,
-		WebhookEmail: webhookEmail,
-		WebhookToken: webhookToken,
-	}, nil
-}
-
-func getOrFatal(key string) string {
-	value := os.Getenv(key)
-	if value == "" {
-		logger.Error("Environment variable %s is required", key)
-		os.Exit(1)
 		}
-	return value
+
+		envValue := os.Getenv(envKey)
+		required := field.Tag.Get("required") == "true"
+		defaultValue := field.Tag.Get("default")
+
+		if envValue == "" {
+			if required {
+				return Options{}, fmt.Errorf("required environment variable %s is not set", envKey)
+			}
+			if defaultValue != "" {
+				envValue = defaultValue
+			}
+		}
+
+		// Set the field value based on its type
+		if err := setFieldValue(fieldValue, envValue, field.Type); err != nil {
+			return Options{}, fmt.Errorf("invalid value for %s: %w", envKey, err)
+		}
+	}
+
+	return opts, nil
 }
 
-func getOrDefault(key, defaultValue string) string {
+func setFieldValue(field reflect.Value, value string, fieldType reflect.Type) error {
-	value := os.Getenv(key)
+	switch fieldType.Kind() {
-	if value == "" {
+	case reflect.String:
+		field.SetString(value)
+	case reflect.Slice:
+		if fieldType.Elem().Kind() == reflect.String {
+			// Handle []string by splitting on spaces
+			items := strings.Fields(value)
+			slice := reflect.MakeSlice(fieldType, len(items), len(items))
+			for i, item := range items {
+				slice.Index(i).SetString(item)
+			}
+			field.Set(slice)
+		}
+	default:
+		return fmt.Errorf("unsupported field type: %s", fieldType.Kind())
+	}
+	return nil
+}
+
+// GenerateEnvExample creates a .env.example file from the Options struct
+func GenerateEnvExample() error {
+	optsType := reflect.TypeOf(Options{})
+
+	// Generate the .env.example content dynamically
+	content := "# EVE PI Configuration\n"
+
+	for i := 0; i < optsType.NumField(); i++ {
+		field := optsType.Field(i)
+		envKey := field.Tag.Get("env")
+		if envKey == "" {
+			continue
+		}
+
+		required := field.Tag.Get("required") == "true"
+		defaultValue := field.Tag.Get("default")
+		description := field.Tag.Get("description")
+
+		// Generate example value
+		exampleValue := generateExampleValue(field.Name, envKey, defaultValue, required)
+
+		content += fmt.Sprintf("# %s\n", description)
+		content += fmt.Sprintf("%s=%s\n\n", envKey, exampleValue)
+	}
+
+	file, err := os.Create(".env.example")
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	_, err = file.WriteString(content)
+	return err
+}
+
+func generateExampleValue(fieldName, envKey, defaultValue string, required bool) string {
+	// If there's a default value, use it
+	if defaultValue != "" {
 		return defaultValue
 	}
-	return value
+
+	// If no default value, use placeholder
+	return "your_" + strings.ToLower(envKey) + "_here"
 }