From 228288f7f152efa8176c254c8fb76af09bf42b0f Mon Sep 17 00:00:00 2001
From: Dov <dov.rimo@mwm.io>
Date: Tue, 14 Nov 2023 11:24:22 +0100
Subject: [PATCH] [openapi] Add WithOperationID

---
 openapi/builder.go       |  9 +++++++++
 utils/path_formatting.go | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 utils/path_formatting.go

diff --git a/openapi/builder.go b/openapi/builder.go
index 27ad910..efe3f61 100644
--- a/openapi/builder.go
+++ b/openapi/builder.go
@@ -6,6 +6,7 @@ import (
 	"github.com/swaggest/openapi-go/openapi3"
 
 	"github.com/mwm-io/gapi/errors"
+	"github.com/mwm-io/gapi/utils"
 )
 
 // DocBuilder is a builder to simplify the documentation of an operation
@@ -64,6 +65,8 @@ func (b *DocBuilder) Error() error {
 // WithSummary set a Summary (Title) to the operation
 func (b *DocBuilder) WithSummary(summary string) *DocBuilder {
 	b.operation.WithSummary(summary)
+	defaultOperationID := utils.GenerateOperationID("/" + b.httpMethod + b.path)
+	b.operation.ID = &defaultOperationID
 	return b
 }
 
@@ -239,3 +242,9 @@ func (b *DocBuilder) WithError(statusCode int, kind, message string, options ...
 
 	return b
 }
+
+// WithOperationID set an operationID to the operation
+func (b *DocBuilder) WithOperationID(operationID string) *DocBuilder {
+	b.operation.ID = &operationID
+	return b
+}
diff --git a/utils/path_formatting.go b/utils/path_formatting.go
new file mode 100644
index 0000000..73e382c
--- /dev/null
+++ b/utils/path_formatting.go
@@ -0,0 +1,33 @@
+package utils
+
+import (
+	"regexp"
+	"strings"
+)
+
+func toTitleCase(s string) string {
+	if s == "" {
+		return s
+	}
+	return strings.ToUpper(s[:1]) + s[1:]
+}
+
+func GenerateOperationID(path string) string {
+	re := regexp.MustCompile(`{([^}]+)}`)
+	path = re.ReplaceAllString(path, "")
+
+	pathParts := strings.Split(path, "/")
+	for i, part := range pathParts {
+		if part != "" {
+			pathParts[i] = toTitleCase(strings.ToLower(part))
+		}
+	}
+	operationID := strings.Join(pathParts, "")
+
+	operationID = strings.ReplaceAll(operationID, "-", "")
+	operationID = strings.ReplaceAll(operationID, "/", "")
+	operationID = strings.ReplaceAll(operationID, "_", "")
+	operationID = strings.ToLower(operationID[:1]) + operationID[1:]
+
+	return operationID
+}