package main

import (
	"fmt"

	"go.wit.com/lib/protobuf/chatpb"
	"google.golang.org/protobuf/proto"
)

func main() {
	// 1. Create our source object that we want to copy.
	originalChat := &chatpb.Chat{
		From:    chatpb.Who_USER,
		Content: "This is a test message.",
		Uuid:    "uuid-original",
	}

	// 2. Create the list we want to append to.
	allChats := &chatpb.Chats{
		Uuid: "main-chat-list",
	}

	fmt.Printf("Before copy, originalChat's content: '%s'\n", originalChat.GetContent())
	fmt.Printf("Initial length of allChats: %d\n\n", len(allChats.GetChats()))

	// 3. Create a deep copy using proto.Clone().
	// The result is a proto.Message, so we must type-assert it back to *chatpb.Chat.
	chatCopy := proto.Clone(originalChat).(*chatpb.Chat)

	// 4. Append the COPY to the list.
	allChats.Chats = append(allChats.GetChats(), chatCopy)

	fmt.Println("--- Appended the copy. Now modifying the original... ---")

	// 5. Now, modify the original object.
	originalChat.Content = "The original message has been changed!"
	originalChat.Uuid = "uuid-modified"

	// 6. Prove that the copy in the list was NOT affected.
	fmt.Printf("\nAfter modification, originalChat's content: '%s'\n", originalChat.GetContent())

	appendedChat := allChats.GetChats()[0]
	fmt.Printf("Appended chat's content: '%s'\n", appendedChat.GetContent())
	fmt.Printf("Appended chat's UUID: '%s'\n", appendedChat.GetUuid())

	fmt.Println("\nSuccess! The appended chat is an independent copy and was not affected by changes to the original.")
}