audit.go

package audit

import (
	"reflect"
	"regexp"
	"strings"

	"github.com/r3labs/diff/v2"
	"gitlab.com/uafrica/go-utils/reflection"
	"gitlab.com/uafrica/go-utils/string_utils"
)

type FieldChange struct {
	From interface{} `json:"change_from"`
	To   interface{} `json:"change_to"`
}

func GetChanges(original interface{}, new interface{}) (map[string]interface{}, error) {
	changes := map[string]interface{}{}
	changelog, err := diff.Diff(original, new)
	if err != nil {
		return changes, err
	}

	for _, change := range changelog {

		if len(change.Path) == 1 {
			// Root object change
			field := ToSnakeCase(change.Path[0])
			changes[field] = FieldChange{
				From: change.From,
				To:   change.To,
			}
		} else if len(change.Path) == 2 {
			// Child object changed
			// ["Account", "ID"]
			// 0 = Object
			// 1 = field

			objectKey := ToSnakeCase(change.Path[0])
			field := ToSnakeCase(change.Path[1])

			existingObject, present := changes[objectKey]
			if present {
				if object, ok := existingObject.(map[string]interface{}); ok {
					object[field] = FieldChange{
						From: change.From,
						To:   change.To,
					}
					changes[objectKey] = object
				}
			} else {
				fieldChange := map[string]interface{}{
					field: FieldChange{
						From: change.From,
						To:   change.To,
					},
				}
				changes[objectKey] = fieldChange
			}

		} else if len(change.Path) == 3 {
			// Array of objects
			// ["Parcel", "0", "ActualWeight"]
			// 0 = Object
			// 1 = Index of object
			// 2 = field

			objectKey := ToSnakeCase(change.Path[0])
			indexString := change.Path[1]