Add App.

app/ChatMasterMind/ChatData.swift

@@ -0,0 +1,58 @@
+//
+//  Item.swift
+//  ChatMasterMind
+//
+//  Created by Oleksandr Kozachuk on 2023-06-24.
+//
+
+import Foundation
+import SwiftData
+
+@Model
+final class ChatPair: Identifiable {
+    let id: UUID
+    var timestamp: Date
+    var question: String
+    var answer: String?
+    var previousVersions: [ChatPair]
+    
+    init(question: String, answer: String? = nil, timestamp: Date = Date(), previousVersions: [ChatPair] = []) {
+        self.id = UUID()
+        self.question = question
+        self.answer = answer
+        self.timestamp = timestamp
+        self.previousVersions = previousVersions
+    }
+}
+
+@Model
+final class ChatHistory: Identifiable {
+    let id: UUID
+    var name: String
+    var chatPairs: [ChatPair]
+    
+    init(name: String, chatPairs: [ChatPair] = []) {
+        self.id = UUID()
+        self.name = name
+        self.chatPairs = chatPairs
+    }
+    
+    func addChatPair(question: String, answer: String? = nil, timestamp: Date = Date()) {
+        let newPair = ChatPair(question: question, answer: answer, timestamp: timestamp)
+        chatPairs.append(newPair)
+    }
+    
+    func editChatPair(withId id: UUID, question: String? = nil, answer: String? = nil) {
+        guard let index = chatPairs.firstIndex(where: { $0.id == id }) else { return }
+        let newChatPair = chatPairs[index]
+        newChatPair.previousVersions.append(chatPairs[index])
+        if let question = question {
+            newChatPair.question = question
+        }
+        if let answer = answer {
+            newChatPair.answer = answer
+        }
+        newChatPair.timestamp = Date()
+        chatPairs[index] = newChatPair
+    }
+}