From 425e24853e87af36edd4a5e4971f156278dda808 Mon Sep 17 00:00:00 2001
From: MikeHughes-BIN <mike.hughes0506@gmail.com>
Date: Thu, 4 Dec 2025 10:58:50 +0100
Subject: [PATCH] Similar to the Gemini LLM we now have a ChatGPT REST call.
 The API Key is still missing

---
 services/modules/llm-chat_gpt/chatgpt.js | 82 ++++++++++++++++++++++--
 1 file changed, 76 insertions(+), 6 deletions(-)

diff --git a/services/modules/llm-chat_gpt/chatgpt.js b/services/modules/llm-chat_gpt/chatgpt.js
index 8446af5..b163b27 100644
--- a/services/modules/llm-chat_gpt/chatgpt.js
+++ b/services/modules/llm-chat_gpt/chatgpt.js
@@ -1,8 +1,78 @@
+const outputDir = path.join(__dirname, "../../../storage/documents"); //  path for output directory
+
+if (!fs.existsSync(outputDir)) {
+    fs.mkdirSync(outputDir, { recursive: true }); // Create output directory if it doesn't exist
+}
+
+// Ensure Chat GPT API key is set in environment variables: export CHAT_GPT_API_KEY="your_api_key_here"
+// NOTE: Using standard OPENAI_API_KEY instead because the API expects this env variable
+const OPENAI_API_KEY = process.env.OPENAI_API_KEY; // Ensure Chat GPT API key is set in environment variables: export OPENAI_API_KEY="your_api_key_here"
+
+const CHAT_GPT_URL = "https://api.openai.com/v1/chat/completions"; //URL for the REST call, used model and action
+
 module.exports = {
-    name:"chatgpt", // Unique name for our function that will later be used to get the function from the map via "mapFunctions.get("example").function()"
-    type:"llm", // value used to differentiate each module to order them in the UI
-    displayname:"ChatGPT", // The displayname used within the UI
-    async function(parameter){
-        // TODO add code to actually send the transcript to ChatGPT and get a response back
+    name: "llm-chat_gpt",
+    type: "llm",
+    displayname: "Chat GPT",
+    description: "Generates documents using Chat GPT",
+
+    async function(parameter) {
+        try {
+            console.log("Chat GPT module invoked with parameters:", parameter);
+
+            await this.createDocumentFromTranscript( //Call the function to create document with transcript, document type and language
+                parameter.inputTranscriptPath, // Path to input transcript file
+                parameter.documentTypePath, // Path to document type file which is chosen in the front end by the user
+                parameter.language // Language for the document which is chosen in the front end by the user
+            );
+
+        } catch (error) {
+            console.error("Error in Chat GPT module:", error);
+        }
+    },
+
+    createDocumentFromTranscript: async function(transcriptPath, documentTypePath, language = "en") { // default language is English
+        try {
+            const transcript = await fs.promises.readFile(transcriptPath, "utf-8"); //read transcript file from Path
+            const documentType = await fs.promises.readFile(documentTypePath, "utf-8"); //read document type from Path
+            const promptText = `${documentType}, in language ${language}, transcript:\n\n${transcript}`; //combine doc type, language and transcript - Change prompt here if needed
+
+            // --- REST CALL ---
+            const response = await fetch(CHAT_GPT_URL, {
+                method: "POST",
+                headers: {
+                    "Authorization": `Bearer ${OPENAI_API_KEY}`,
+                    "Content-Type": "application/json"
+                },
+                body: JSON.stringify({
+                    model: "gpt-4.1",
+                    messages: [
+                        { role: "user", content: promptText }
+                    ]
+                })
+            });
+
+            if (!response.ok) { //ok is true when a responce was successfull
+                const text = await response.text();
+                throw new Error(`Chat GPT API error (${response.status}): ${text}`);
+            }
+
+            const data = await response.json();
+
+            // Get generated text from response or default to empty string (if null)
+            // FIX: Chat Completions API uses data.choices[x].message.content
+            const output = data.choices?.[0]?.message?.content || "";
+
+            let inputTranscriptName = path.basename(transcriptPath, path.extname(transcriptPath)); // Name for the output file 
+            console.log(inputTranscriptName);
+
+            const outPath = path.join(outputDir, `${inputTranscriptName}.md`); // Output file path & name to make naming dynamic. Pulled from input transcript name
+            fs.writeFileSync(outPath, output, "utf8"); // Write output to file
+
+            console.log("Generated document written to:", outPath);
+
+        } catch (error) {
+            console.error("Error generating Chat GPT content:", error);
+        }
     }
-}
\ No newline at end of file
+};