Add conversation retrieval endpoint to ChatService

Implemented a new method in ChatService and ChatServiceImpl to fetch conversation history. Added a corresponding endpoint in AppController to handle GET requests for conversation dialogues based on requestId.

module-server/src/main/kotlin/de/hbt/routing/controller/AppController.kt

@@ -1,13 +1,11 @@
 package de.hbt.routing.controller
 
 import de.hbt.routing.service.ChatService
+import de.hbt.routing.service.helper.ConversationCache
 import mu.KotlinLogging
 import org.springframework.http.HttpStatus
 import org.springframework.http.ResponseEntity
-import org.springframework.web.bind.annotation.PostMapping
-import org.springframework.web.bind.annotation.RequestBody
-import org.springframework.web.bind.annotation.RequestMapping
-import org.springframework.web.bind.annotation.RestController
+import org.springframework.web.bind.annotation.*
 
 private val logger = KotlinLogging.logger {}
 
@@ -17,6 +15,7 @@ class AppController(private val chatService: ChatService) {
 
     data class ChatRequest(val requestId: String, val prompt: String)
     data class ChatResponse(val requestId: String, val answer: String)
+    data class ConversationResponse(val requestId: String, val dialogues: List<ConversationCache.PromptAndAnswer>)
 
     @PostMapping("/send")
     fun sendPrompt(@RequestBody request: ChatRequest): ResponseEntity<ChatResponse> {
@@ -28,4 +27,15 @@ class AppController(private val chatService: ChatService) {
             ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(ChatResponse(request.requestId, "Error: ${e.message}"))
         }
     }
+
+    @GetMapping("/conversation/{requestId}")
+    fun getConversation(@PathVariable requestId: String): ResponseEntity<ConversationResponse> {
+        return try {
+            val dialogues = chatService.getConversation(requestId)
+            ResponseEntity.ok(ConversationResponse(requestId, dialogues))
+        } catch (e: Exception) {
+            logger.error(e) { "Exception occurred while retrieving conversation for requestId: $requestId" }
+            ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(ConversationResponse(requestId, emptyList()))
+        }
+    }
 }

module-server/src/main/kotlin/de/hbt/routing/service/ChatService.kt

@@ -1,6 +1,9 @@
 package de.hbt.routing.service
 
+import de.hbt.routing.service.helper.ConversationCache
+
 interface ChatService {
     data class Response(val requestId: String, val response: String)
     fun processPrompt(requestId: String, prompt: String): Response
+    fun getConversation(requestId: String): List<ConversationCache.PromptAndAnswer>
 }

module-server/src/main/kotlin/de/hbt/routing/service/ChatServiceImpl.kt

@@ -16,4 +16,8 @@ class ChatServiceImpl(private val conversationCache: ConversationCache) : ChatSe
 
         return response
     }
+
+    override fun getConversation(requestId: String): List<ConversationCache.PromptAndAnswer> {
+        return conversationCache.getConversation(requestId)
+    }
 }