import React from "react";
import ReactMarkdown from "react-markdown";
import type { ChatMessage } from "../../types";

interface MessageItemProps {
  message: ChatMessage;
  isEditing: boolean;
  editContent: string;
  isLoading: boolean;
  onEditContentChange: (content: string) => void;
  onEditMessage: (messageId: string, content: string) => void;
  onCancelEdit: () => void;
  onSaveEdit: (messageId: string) => void;
  onSwitchVersion: (messageId: string, direction: "prev" | "next") => void;
}

export function MessageItem({
  message,
  isEditing,
  editContent,
  isLoading,
  onEditContentChange,
  onEditMessage,
  onCancelEdit,
  onSaveEdit,
  onSwitchVersion,
}: MessageItemProps) {
  if (isEditing) {
    return (
      <div className={`message ${message.role}`}>
        <div className="message-edit-form">
          <textarea
            value={editContent}
            onChange={(e) => onEditContentChange(e.target.value)}
            className="message-edit-textarea"
            autoFocus
          />
          <div className="message-edit-actions">
            <button className="edit-cancel-btn" onClick={onCancelEdit}>
              Отмена
            </button>
            <button
              className="edit-save-btn"
              onClick={() => onSaveEdit(message.id)}
            >
              Сохранить и переиграть
            </button>
          </div>
        </div>
      </div>
    );
  }

  return (
    <div className={`message ${message.role}`}>
      <div className="message-content">
        <ReactMarkdown>{message.content}</ReactMarkdown>
      </div>
      <div className="message-footer">
        <span className="message-time">
          {new Date(message.timestamp).toLocaleTimeString("ru-RU", {
            hour: "2-digit",
            minute: "2-digit",
          })}
        </span>
        {message.role === "user" && !isLoading && (
          <div className="message-actions">
            {message.versions && message.versions.length > 1 && (
              <div className="version-switcher">
                <button
                  className="version-btn"
                  onClick={() => onSwitchVersion(message.id, "prev")}
                >
                  ‹
                </button>
                <span className="version-indicator">
                  {(message.activeVersion || 0) + 1}/{message.versions.length}
                </span>
                <button
                  className="version-btn"
                  onClick={() => onSwitchVersion(message.id, "next")}
                >
                  ›
                </button>
              </div>
            )}
            <button
              className="edit-btn"
              onClick={() => onEditMessage(message.id, message.content)}
              title="Редактировать"
            >
              ✏️
            </button>
          </div>
        )}
      </div>
    </div>
  );
}

interface StreamingMessageProps {
  content: string;
}

export function StreamingMessage({ content }: StreamingMessageProps) {
  return (
    <div className="message assistant streaming">
      <div className="message-content">
        <ReactMarkdown>{content}</ReactMarkdown>
      </div>
    </div>
  );
}

export function LoadingMessage() {
  return (
    <div className="message assistant loading">
      <div className="typing-indicator">
        <span></span>
        <span></span>
        <span></span>
      </div>
    </div>
  );
}

interface ErrorMessageProps {
  error: string;
  onDismiss: () => void;
}

export function ErrorMessage({ error, onDismiss }: ErrorMessageProps) {
  return (
    <div className="error-message">
      <span>⚠️ {error}</span>
      <button onClick={onDismiss}>✕</button>
    </div>
  );
}

interface MessageListProps {
  messages: ChatMessage[];
  streamingContent: string;
  isLoading: boolean;
  error: string | null;
  editingMessageId: string | null;
  editContent: string;
  onEditContentChange: (content: string) => void;
  onEditMessage: (messageId: string, content: string) => void;
  onCancelEdit: () => void;
  onSaveEdit: (messageId: string) => void;
  onSwitchVersion: (messageId: string, direction: "prev" | "next") => void;
  onDismissError: () => void;
  messagesEndRef: React.RefObject<HTMLDivElement>;
  messagesContainerRef: React.RefObject<HTMLDivElement>;
  onScroll: () => void;
}

export function MessageList({
  messages,
  streamingContent,
  isLoading,
  error,
  editingMessageId,
  editContent,
  onEditContentChange,
  onEditMessage,
  onCancelEdit,
  onSaveEdit,
  onSwitchVersion,
  onDismissError,
  messagesEndRef,
  messagesContainerRef,
  onScroll,
}: MessageListProps) {
  return (
    <div
      className="messages-container"
      ref={messagesContainerRef}
      onScroll={onScroll}
    >
      {messages.map((message) => (
        <MessageItem
          key={message.id}
          message={message}
          isEditing={editingMessageId === message.id}
          editContent={editContent}
          isLoading={isLoading}
          onEditContentChange={onEditContentChange}
          onEditMessage={onEditMessage}
          onCancelEdit={onCancelEdit}
          onSaveEdit={onSaveEdit}
          onSwitchVersion={onSwitchVersion}
        />
      ))}

      {isLoading && streamingContent && (
        <StreamingMessage content={streamingContent} />
      )}

      {isLoading && !streamingContent && <LoadingMessage />}

      {error && <ErrorMessage error={error} onDismiss={onDismissError} />}

      <div ref={messagesEndRef} />
    </div>
  );
}