package infra

import (
	"fmt"
	"reflect"
)

const secretMask = "***"

// ConfigDump converts a configuration struct to a map[string]string.
// Exported fields are included. Fields tagged with secret:"true" have their
// value replaced with "***". Nested structs are not traversed — only top-level
// exported fields are included.
//
// The map key is the field name. Values are formatted with fmt.Sprintf("%v", ...).
func ConfigDump(cfg any) map[string]string {
	result := make(map[string]string)

	v := reflect.ValueOf(cfg)
	if v.Kind() == reflect.Ptr {
		if v.IsNil() {
			return result
		}
		v = v.Elem()
	}
	if v.Kind() != reflect.Struct {
		return result
	}

	t := v.Type()
	for i := 0; i < t.NumField(); i++ {
		field := t.Field(i)
		if !field.IsExported() {
			continue
		}
		key := field.Name

		if field.Tag.Get("secret") == "true" {
			result[key] = secretMask
			continue
		}

		fv := v.Field(i)
		result[key] = fmt.Sprintf("%v", fv.Interface())
	}

	return result
}