refactor: move tool call parsing and formatting logic to a dedicated internal/toolcall package

internal/toolcall/toolcalls_format.go

@@ -0,0 +1,41 @@
+package toolcall
+
+import (
+	"encoding/json"
+	"strings"
+
+	"github.com/google/uuid"
+)
+
+func FormatOpenAIToolCalls(calls []ParsedToolCall) []map[string]any {
+	out := make([]map[string]any, 0, len(calls))
+	for _, c := range calls {
+		args, _ := json.Marshal(c.Input)
+		out = append(out, map[string]any{
+			"id":   "call_" + strings.ReplaceAll(uuid.NewString(), "-", ""),
+			"type": "function",
+			"function": map[string]any{
+				"name":      c.Name,
+				"arguments": string(args),
+			},
+		})
+	}
+	return out
+}
+
+func FormatOpenAIStreamToolCalls(calls []ParsedToolCall) []map[string]any {
+	out := make([]map[string]any, 0, len(calls))
+	for i, c := range calls {
+		args, _ := json.Marshal(c.Input)
+		out = append(out, map[string]any{
+			"index": i,
+			"id":    "call_" + strings.ReplaceAll(uuid.NewString(), "-", ""),
+			"type":  "function",
+			"function": map[string]any{
+				"name":      c.Name,
+				"arguments": string(args),
+			},
+		})
+	}
+	return out
+}