"use client";

import { useEffect, useRef, useState } from "react";
import { useActiveChat } from "@/hooks/use-active-chat";
import type { Attachment, ChatMessage } from "@/lib/types";
import { ChatHeader } from "./chat-header";
import { DataStreamHandler } from "./data-stream-handler";
import { submitEditedMessage } from "./message-editor";
import { Messages } from "./messages";
import { MultimodalInput } from "./multimodal-input";

export function ChatShell() {
  const {
    chatId,
    messages,
    setMessages,
    sendMessage,
    status,
    stop,
    regenerate,
    addToolApprovalResponse,
    input,
    setInput,
    visibilityType,
    isReadonly,
    isLoading,
    votes,
    currentModelId,
    setCurrentModelId,
  } = useActiveChat();

  const [editingMessage, setEditingMessage] = useState<ChatMessage | null>(
    null
  );
  const [attachments, setAttachments] = useState<Attachment[]>([]);

  const stopRef = useRef(stop);
  stopRef.current = stop;

  const prevChatIdRef = useRef(chatId);
  useEffect(() => {
    if (prevChatIdRef.current !== chatId) {
      prevChatIdRef.current = chatId;
      stopRef.current();
      setEditingMessage(null);
      setAttachments([]);
    }
  }, [chatId]);

  return (
    <>
      <div className="flex h-dvh w-full flex-row overflow-hidden">
        <div className="flex min-w-0 flex-col bg-sidebar w-full">
          <ChatHeader
            chatId={chatId}
            isReadonly={isReadonly}
            selectedVisibilityType={visibilityType}
          />

          <div className="relative flex min-h-0 flex-1 flex-col overflow-hidden bg-background md:rounded-tl-[12px] md:border-t md:border-l md:border-border/40">
            <Messages
              addToolApprovalResponse={addToolApprovalResponse}
              chatId={chatId}
              isLoading={isLoading}
              isReadonly={isReadonly}
              messages={messages}
              onEditMessage={(msg) => {
                const text = msg.parts
                  ?.filter((p) => p.type === "text")
                  .map((p) => p.text)
                  .join("");
                setInput(text ?? "");
                setEditingMessage(msg);
              }}
              regenerate={regenerate}
              selectedModelId={currentModelId}
              setMessages={setMessages}
              status={status}
              votes={votes}
            />

            <div className="sticky bottom-0 z-1 mx-auto flex w-full max-w-4xl gap-2 border-t-0 bg-background px-2 pb-3 md:px-4 md:pb-4">
              {!isReadonly && (
                <MultimodalInput
                  attachments={attachments}
                  chatId={chatId}
                  editingMessage={editingMessage}
                  input={input}
                  isLoading={isLoading}
                  messages={messages}
                  onCancelEdit={() => {
                    setEditingMessage(null);
                    setInput("");
                  }}
                  onModelChange={setCurrentModelId}
                  selectedModelId={currentModelId}
                  selectedVisibilityType={visibilityType}
                  sendMessage={
                    editingMessage
                      ? async () => {
                          const msg = editingMessage;
                          setEditingMessage(null);
                          await submitEditedMessage({
                            message: msg,
                            text: input,
                            setMessages,
                            regenerate,
                          });
                          setInput("");
                        }
                      : sendMessage
                  }
                  setAttachments={setAttachments}
                  setInput={setInput}
                  setMessages={setMessages}
                  status={status}
                  stop={stop}
                />
              )}
            </div>
          </div>
        </div>
      </div>

      <DataStreamHandler />
    </>
  );
}