class ChatUI {
  constructor() {
    this.messageContainer = document.getElementById("chat-messages");
    this.input = document.getElementById("chat-input");
    this.sendButton = document.getElementById("send-button");
    this.promptButton = document.getElementById("prompt-button");
    this.promptPanel = document.getElementById("prompt-panel");

    // 确保AI服务已经初始化
    if (!window.aiService) {
      throw new Error("AI Service not initialized");
    }
    this.aiService = window.aiService;

    this.typingSpeed = 50; // 打字速度（毫秒/字符）

    this.setupEventListeners();
    this.adjustInputHeight();
    this.init();

    // 添加新消息指示器
    this.createNewMessageIndicator();

    // 监听滚动事件
    this.messageContainer.addEventListener(
      "scroll",
      this.handleScroll.bind(this)
    );

    // 创建打断按钮
    this.stopButton = document.createElement("button");
    this.stopButton.className = "stop-button";
    this.stopButton.innerHTML = `
      <svg viewBox="0 0 24 24" fill="currentColor">
        <path d="M6 6h12v12H6z"/>
      </svg>
      <span>停止生成</span>
    `;

    // 将打断按钮添加到输入按钮区域
    document.querySelector(".input-buttons").appendChild(this.stopButton);

    // 添加打断按钮事件监听
    this.stopButton.addEventListener("click", () => this.handleStop());

    this.isTyping = false; // 添加打字状态标记
    this.loadingDiv = null; // 添加加载动画的引用
    this.inputWrapper = document.querySelector(".input-wrapper");
  }

  async init() {
    try {
      await this.aiService.init();
      await this.checkApiKey();
    } catch (error) {
      console.error("ChatUI initialization failed:", error);
      this.addMessage("初始化失败，请刷新页面重试。", "assistant");
    }
  }

  setupEventListeners() {
    // 发送消息
    this.sendButton.addEventListener("click", () => this.handleSend());
    this.input.addEventListener("keydown", (e) => {
      if (e.key === "Enter" && !e.shiftKey) {
        e.preventDefault();
        this.handleSend();
      }
    });

    // 自动调整输入框高度
    this.input.addEventListener("input", () => this.adjustInputHeight());

    // 快捷指令面板
    this.promptButton.addEventListener("click", () => this.togglePromptPanel());
    document.querySelector(".close-prompt").addEventListener("click", () => {
      this.promptPanel.classList.remove("show");
    });

    // 点击快捷指令
    document.querySelectorAll(".prompt-item").forEach((item) => {
      item.addEventListener("click", () => {
        this.input.value = item.textContent;
        this.promptPanel.classList.remove("show");
        this.adjustInputHeight();
        this.input.focus();
      });
    });

    // 点击外部关闭快捷指令面板
    document.addEventListener("click", (e) => {
      if (
        !this.promptPanel.contains(e.target) &&
        !this.promptButton.contains(e.target)
      ) {
        this.promptPanel.classList.remove("show");
      }
    });
  }

  async handleSend() {
    const message = this.input.value.trim();
    if (!message) return;

    // 处理命令
    if (message.startsWith("/setapi ")) {
      const apiKey = message.substring(8).trim();
      await this.aiService.setApiKey(apiKey);

      // 根据是否使用默认密钥显示不同消息
      if (apiKey === CONFIG.AI_API.DEFAULT_API_KEY) {
        this.addMessage("已恢复使用默认API密钥", "assistant", false);
      } else {
        this.addMessage("自定义API密钥已设置", "assistant", false);
      }

      this.input.value = "";
      return;
    }

    // 添加用户消息
    this.addMessage(message, "user", false);

    // 更新上下文
    this.aiService.updateContext(message, "user");

    // 清空输入框
    this.input.value = "";
    this.adjustInputHeight();

    try {
      this.stopButton.classList.add("show");
      this.setInputState(true); // 禁用输入框
      this.loadingDiv = this.createLoadingMessage();

      const response = await this.aiService.sendMessage(message);

      if (this.loadingDiv) {
        this.loadingDiv.remove();
        this.loadingDiv = null;
      }

      if (!response) return;

      this.isTyping = false;
      await this.addMessage(response, "assistant", true);

      this.stopButton.classList.remove("show");
      this.setInputState(false); // 恢复输入框

      this.aiService.updateContext(response, "assistant");
    } catch (error) {
      if (this.loadingDiv) {
        this.loadingDiv.remove();
        this.loadingDiv = null;
      }

      this.stopButton.classList.remove("show");
      this.setInputState(false); // 恢复输入框
      this.isTyping = false;

      if (error.message === "REQUEST_ABORTED") {
        return;
      }

      this.addMessage("抱歉，发生了一些错误，请稍后重试。", "assistant", false);
      console.error("AI response error:", error);
    }
  }

  /**
   * 添加消息到聊天界面
   * @param {string} content 消息内容
   * @param {string} type 消息类型（user/assistant）
   * @param {boolean} typing 是否使用打字效果
   * @param {boolean} isInterrupted 是否是中断消息
   */
  async addMessage(
    content,
    type,
    typing = type === "assistant",
    isInterrupted = false
  ) {
    const messageDiv = document.createElement("div");
    messageDiv.className = `message ${type}`;

    const messageContent = document.createElement("div");
    messageContent.className = "message-content";
    if (isInterrupted) {
      messageContent.classList.add("interrupted");
    }

    const paragraph = document.createElement("p");
    messageContent.appendChild(paragraph);

    // 创建操作栏（时间戳和复制按钮）
    const actionsDiv = document.createElement("div");
    actionsDiv.className = "message-actions";

    // 只为非中断的AI消息添加复制按钮
    if (type === "assistant" && !isInterrupted) {
      const copyButton = this.createCopyButton(content);
      actionsDiv.appendChild(copyButton);
    }

    // 添加时间戳
    const timestamp = document.createElement("div");
    timestamp.className = "message-timestamp";
    timestamp.textContent = this.formatTime(new Date());
    actionsDiv.appendChild(timestamp);

    messageContent.appendChild(actionsDiv);
    messageDiv.appendChild(messageContent);
    this.messageContainer.appendChild(messageDiv);

    if (typing) {
      messageContent.classList.add("typing");
      await this.typeMessage(paragraph, content);
      messageContent.classList.remove("typing");
    } else {
      paragraph.innerHTML = this.formatMessage(content);
    }

    const { scrollTop, scrollHeight, clientHeight } = this.messageContainer;
    const wasAtBottom = scrollHeight - scrollTop - clientHeight < 100;

    if (wasAtBottom) {
      this.scrollToBottom();
    } else {
      this.newMessageIndicator.classList.add("show");
    }
  }

  /**
   * 实现打字机效果
   * @param {HTMLElement} element 要添加文字的元素
   * @param {string} text 要显示的文字
   */
  async typeMessage(element, text) {
    let index = 0;
    const rawText = text;
    const tempDiv = document.createElement("div");
    this.isTyping = true; // 开始打字

    return new Promise((resolve) => {
      const type = () => {
        // 检查是否被中断
        if (!this.isTyping) {
          resolve();
          return;
        }

        if (index < rawText.length) {
          const currentText = rawText.substring(0, index + 1);
          tempDiv.innerHTML = this.formatMessage(currentText);
          element.innerHTML = tempDiv.innerHTML;

          index++;
          this.scrollToBottom();
          setTimeout(type, this.typingSpeed);
        } else {
          this.isTyping = false; // 打字结束
          resolve();
        }
      };
      type();
    });
  }

  adjustInputHeight() {
    this.input.style.height = "auto";
    this.input.style.height = Math.min(this.input.scrollHeight, 120) + "px";
  }

  scrollToBottom() {
    this.messageContainer.scrollTop = this.messageContainer.scrollHeight;
  }

  togglePromptPanel() {
    this.promptPanel.classList.toggle("show");
  }

  escapeHtml(html) {
    const div = document.createElement("div");
    div.textContent = html;
    return div.innerHTML;
  }

  async checkApiKey() {
    // 只有当没有任何API密钥时才显示提示
    if (!this.aiService.apiKey) {
      this.addMessage(
        "请先设置DeepSeek API密钥。输入格式：/setapi YOUR_API_KEY",
        "assistant"
      );
    }
  }

  /**
   * 创建加载动画消息
   */
  createLoadingMessage() {
    const loadingDiv = document.createElement("div");
    loadingDiv.className = "message assistant";
    loadingDiv.innerHTML = `
      <div class="message-content loading">
        <div class="typing-indicator">
          <span></span>
          <span></span>
          <span></span>
        </div>
      </div>
    `;
    this.messageContainer.appendChild(loadingDiv);
    this.scrollToBottom();
    return loadingDiv;
  }

  /**
   * 格式化时间
   */
  formatTime(date) {
    const hours = date.getHours().toString().padStart(2, "0");
    const minutes = date.getMinutes().toString().padStart(2, "0");
    return `${hours}:${minutes}`;
  }

  createNewMessageIndicator() {
    this.newMessageIndicator = document.createElement("div");
    this.newMessageIndicator.className = "new-messages-indicator";
    this.newMessageIndicator.textContent = "新消息";
    this.newMessageIndicator.addEventListener("click", () => {
      this.scrollToBottom();
    });
    document
      .querySelector(".chat-container")
      .appendChild(this.newMessageIndicator);
  }

  handleScroll() {
    const { scrollTop, scrollHeight, clientHeight } = this.messageContainer;
    const isNearBottom = scrollHeight - scrollTop - clientHeight < 100;

    if (isNearBottom) {
      this.newMessageIndicator.classList.remove("show");
    }
  }

  /**
   * 格式化消息内容
   * @param {string} text 原始文本
   * @returns {string} 格式化后的HTML
   */
  formatMessage(text) {
    if (!text) return "";

    return (
      text
        // 处理标题 (h1 ~ h6)
        .replace(/^#{1,6}\s+(.+)$/gm, (match, content) => {
          const level = match.trim().split("#").length - 1;
          return `<h${level}>${content.trim()}</h${level}>`;
        })
        // 处理换行
        .replace(/\n/g, "<br>")
        // 处理连续空格
        .replace(/ {2,}/g, (match) => "&nbsp;".repeat(match.length))
        // 处理代码块
        .replace(
          /```([\s\S]*?)```/g,
          (match, code) =>
            `<pre><code>${this.escapeHtml(code.trim())}</code></pre>`
        )
        // 处理行内代码
        .replace(
          /`([^`]+)`/g,
          (match, code) => `<code>${this.escapeHtml(code)}</code>`
        )
        // 处理粗体
        .replace(/\*\*(.*?)\*\*/g, "<strong>$1</strong>")
        // 处理斜体
        .replace(/\*(.*?)\*/g, "<em>$1</em>")
        // 处理链接
        .replace(
          /\[([^\]]+)\]\(([^)]+)\)/g,
          '<a href="$2" target="_blank">$1</a>'
        )
        // 处理无序列表
        .replace(/^[*-]\s+(.+)$/gm, "<li>$1</li>")
        .replace(/(<li>.*<\/li>)/gs, "<ul>$1</ul>")
        // 处理有序列表
        .replace(/^\d+\.\s+(.+)$/gm, "<li>$1</li>")
        .replace(/(<li>.*<\/li>)/gs, "<ol>$1</ol>")
        // 处理分隔线
        .replace(/^---+$/gm, "<hr>")
        // 处理引用
        .replace(/^>\s+(.+)$/gm, "<blockquote>$1</blockquote>")
    );
  }

  /**
   * 创建复制按钮
   * @param {string} content 要复制的内容
   * @returns {HTMLElement} 复制按钮元素
   */
  createCopyButton(content) {
    const button = document.createElement("button");
    button.className = "copy-button";
    button.innerHTML = `
      <svg viewBox="0 0 24 24" fill="currentColor">
        <path d="M16 1H4C2.9 1 2 1.9 2 3v14h2V3h12V1zm3 4H8C6.9 5 6 5.9 6 7v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/>
      </svg>
      <span>复制</span>
    `;

    button.addEventListener("click", async () => {
      try {
        // 直接使用传入的原始内容
        await this.copyToClipboard(content);

        // 显示复制成功状态
        button.classList.add("copied");
        button.innerHTML = `
          <svg viewBox="0 0 24 24" fill="currentColor">
            <path d="M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4L9 16.2z"/>
          </svg>
          <span>已复制</span>
        `;

        // 2秒后恢复原始状态
        setTimeout(() => {
          button.classList.remove("copied");
          button.innerHTML = `
            <svg viewBox="0 0 24 24" fill="currentColor">
              <path d="M16 1H4C2.9 1 2 1.9 2 3v14h2V3h12V1zm3 4H8C6.9 5 6 5.9 6 7v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/>
            </svg>
            <span>复制</span>
          `;
        }, 2000);
      } catch (err) {
        console.error("Failed to copy text:", err);
      }
    });

    return button;
  }

  /**
   * 复制文本到剪贴板
   * @param {string} text 要复制的文本
   */
  async copyToClipboard(text) {
    try {
      // 通过postMessage发送复制请求到content script
      window.parent.postMessage(
        {
          type: "COPY_TO_CLIPBOARD",
          text: text,
        },
        "*"
      );
      return true;
    } catch (err) {
      console.error("Failed to copy text:", err);
      throw err;
    }
  }

  // 处理打断请求
  async handleStop() {
    try {
      this.aiService.abortRequest();

      if (this.isTyping) {
        this.isTyping = false;
      }

      if (this.loadingDiv) {
        this.loadingDiv.remove();
        this.loadingDiv = null;
      }

      this.stopButton.classList.remove("show");
      this.setInputState(false); // 恢复输入框状态

      this.addMessage("用户手动停止生成", "assistant", false, true);
    } catch (error) {
      console.error("Failed to stop generation:", error);
    }
  }

  // 设置输入框状态
  setInputState(isGenerating) {
    this.input.disabled = isGenerating;
    this.input.placeholder = isGenerating ? "回复生成中..." : "输入消息...";
    if (isGenerating) {
      this.inputWrapper.classList.add("generating");
    } else {
      this.inputWrapper.classList.remove("generating");
    }
  }
}

// 等待DOM加载完成后再初始化
document.addEventListener("DOMContentLoaded", () => {
  try {
    const chatUI = new ChatUI();
  } catch (error) {
    console.error("Failed to initialize ChatUI:", error);
  }
});