From a07c2edf3b62379cf37014c5825bc1952c1c592a Mon Sep 17 00:00:00 2001
From: Denis Zunke <denis.zunke@gmail.com>
Date: Tue, 12 Nov 2024 20:15:14 +0100
Subject: [PATCH] Add interface to final readonly chain for testability

---
 src/Chain.php          |  2 +-
 src/ChainInterface.php | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 src/ChainInterface.php

diff --git a/src/Chain.php b/src/Chain.php
index 0705c8ad..4c27c036 100644
--- a/src/Chain.php
+++ b/src/Chain.php
@@ -14,7 +14,7 @@
 use PhpLlm\LlmChain\Message\MessageBag;
 use PhpLlm\LlmChain\Response\ResponseInterface;
 
-final readonly class Chain
+final readonly class Chain implements ChainInterface
 {
     /**
      * @var InputProcessor[]
diff --git a/src/ChainInterface.php b/src/ChainInterface.php
new file mode 100644
index 00000000..c8815e1d
--- /dev/null
+++ b/src/ChainInterface.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpLlm\LlmChain;
+
+use PhpLlm\LlmChain\Message\MessageBag;
+use PhpLlm\LlmChain\Response\ResponseInterface;
+
+interface ChainInterface
+{
+    /**
+     * @param array<string, mixed> $options
+     */
+    public function call(MessageBag $messages, array $options = []): ResponseInterface;
+}