"use client";
import type { UseChatHelpers } from "@ai-sdk/react";
import equal from "fast-deep-equal";
import { memo, useState } from "react";
import type { Vote } from "@/lib/db/schema";
import type { ChatMessage } from "@/lib/types";
import { cn, sanitizeText } from "@/lib/utils";
import { useDataStream } from "./data-stream-provider";
import { DocumentToolResult } from "./document";
import { DocumentPreview } from "./document-preview";
import { MessageContent } from "./elements/message";
import { Response } from "./elements/response";
import {
  Tool,
  ToolContent,
  ToolHeader,
  ToolInput,
  ToolOutput,
} from "./elements/tool";
import { SparklesIcon } from "./icons";
import { MessageActions } from "./message-actions";
import { MessageEditor } from "./message-editor";
import { MessageReasoning } from "./message-reasoning";
import { PreviewAttachment } from "./preview-attachment";
import { Weather } from "./weather";

/**
 * 解析文本中的标注内容，返回文本片段数组
 * 格式：「图1: 物体」 -> 标注文本（需要高亮）
 */
function parseAnnotations(text: string): Array<{ type: 'normal' | 'annotation'; content: string }> {
  if (!text) {
    return [{ type: 'normal', content: text }];
  }
  
  const parts: Array<{ type: 'normal' | 'annotation'; content: string }> = [];
  let lastIndex = 0;
  const regex = /「([^」]+)」/g;
  let match;
  
  while ((match = regex.exec(text)) !== null) {
    // 添加标注之前的普通文本
    if (match.index > lastIndex) {
      parts.push({ type: 'normal', content: text.slice(lastIndex, match.index) });
    }
    // 添加标注文本（移除「」标记）
    parts.push({ type: 'annotation', content: match[1] });
    lastIndex = match.index + match[0].length;
  }
  
  // 添加最后的普通文本
  if (lastIndex < text.length) {
    parts.push({ type: 'normal', content: text.slice(lastIndex) });
  }
  
  // 如果没有找到标注，返回整个文本
  if (parts.length === 0) {
    return [{ type: 'normal', content: text }];
  }
  
  return parts;
}

/**
 * 过滤掉视频生成过程中的 JSON 和进度信息，只保留真正的视频内容
 * 注意：只对包含特定关键词的内容进行过滤，避免误伤正常消息
 */
function filterVideoContent(text: string): string {
  if (!text) {
    return text;
  }
  
  // 只对包含视频生成相关关键词的内容进行过滤
  const hasVideoKeywords = 
    text.includes("进度") || 
    text.includes("任务正在") || 
    text.includes("视频生成") ||
    text.includes("[视频]") ||
    /\{[^}]*"prompt"[^}]*\}/.test(text) ||
    text.includes(".mp4");
  
  // 如果不包含视频相关关键词，直接返回原文本（避免误伤正常消息）
  if (!hasVideoKeywords) {
    return text;
  }
  
  let filtered = text;
  
  // 1. 提取视频 URL
  let extractedVideoUrl: string | null = null;
  // 匹配 Markdown 链接 [text](url.mp4) 或 [text](url)
  const mdLinkMatch = filtered.match(/\[.*?\]\((https?:\/\/[^)]+\.mp4)\)/);
  if (mdLinkMatch) {
    extractedVideoUrl = mdLinkMatch[1];
  } else {
    // 匹配纯文本 URL
    const urlMatch = filtered.match(/(https?:\/\/[^\s]+\.mp4)/);
    if (urlMatch) {
      extractedVideoUrl = urlMatch[1];
    }
  }

  // 2. 移除 JSON 格式的内容 (匹配多行 json 代码块或单行 json)
  filtered = filtered.replace(/```json[\s\S]*?```/g, "");
  filtered = filtered.replace(/\{[^}]*"prompt"[^}]*\}/g, "");
  filtered = filtered.replace(/\{[^}]*"mode"[^}]*\}/g, "");
  
  // 3. 移除进度信息和提示行
  filtered = filtered.replace(/^[🏃⏱️🕐🔄⌛].*$/gm, ""); // 表情符号开头的行
  filtered = filtered.replace(/^>.*?(进度|任务|队列).*?$/gm, ""); // 引用块开头的进度
  filtered = filtered.replace(/^.*?进度[：:]\s*\d+(\.\d+)?%.*$/gm, ""); // 纯文本进度
  filtered = filtered.replace(/^.*?任务正在.*?$/gm, ""); // 任务提示
  
  // 4. 移除 "视频生成成功" 提示行（避免重复）
  filtered = filtered.replace(/^>.*?视频生成成功.*?$/gm, "");
  filtered = filtered.replace(/^[✅❌].*?视频.*?(成功|失败).*?$/gm, "");
  
  // 清理多余空行
  filtered = filtered.replace(/\n{3,}/g, "\n\n").trim();
  
  // 5. 如果提取到了视频 URL 且当前没有 video 标签，则追加视频组件
  if (extractedVideoUrl && !filtered.includes("<video")) {
    // 构造标准的视频预览 Markdown
    // 假设 Response 组件能渲染 HTML video 标签
    const videoComponent = `\n\n<video src="${extractedVideoUrl}" controls style="max-width: 100%; border-radius: 8px;"></video>\n\n[下载视频](${extractedVideoUrl})`;
    
    // 如果过滤后为空，直接返回视频组件；否则追加在后面
    if (!filtered) {
      filtered = videoComponent;
    } else {
      filtered += videoComponent;
    }
  }
  
  return filtered;
}

const PurePreviewMessage = ({
  chatId,
  message,
  vote,
  isLoading,
  setMessages,
  regenerate,
  sendMessage,
  isReadonly,
  requiresScrollPadding: _requiresScrollPadding,
  onImageEdit,
}: {
  chatId: string;
  message: ChatMessage;
  vote: Vote | undefined;
  isLoading: boolean;
  setMessages: UseChatHelpers<ChatMessage>["setMessages"];
  regenerate: UseChatHelpers<ChatMessage>["regenerate"];
  sendMessage: UseChatHelpers<ChatMessage>["sendMessage"];
  isReadonly: boolean;
  requiresScrollPadding: boolean;
  onImageEdit?: (imageUrl: string) => void;
}) => {
  const [mode, setMode] = useState<"view" | "edit">("view");

  const attachmentsFromMessage = message.parts.filter(
    (part) => part.type === "file"
  );

  useDataStream();

  return (
    <div
      className="group/message fade-in w-full animate-in duration-200"
      data-role={message.role}
      data-testid={`message-${message.role}`}
    >
      <div
        className={cn("flex w-full items-start gap-2 md:gap-3", {
          "justify-end": message.role === "user" && mode !== "edit",
          "justify-start": message.role === "assistant",
        })}
      >
        {message.role === "assistant" && message.parts.some((part) => part.type === "text" && part.text && part.text.trim().length > 0) && (
          <div className="-mt-1 flex size-8 shrink-0 items-center justify-center rounded-full bg-background ring-1 ring-border">
            <SparklesIcon size={14} />
          </div>
        )}

        <div
          className={cn("flex flex-col", {
            "gap-2 md:gap-4": message.parts?.some(
              (p) => p.type === "text" && p.text?.trim()
            ),
            "w-full":
              (message.role === "assistant" &&
                message.parts?.some(
                  (p) => p.type === "text" && p.text?.trim()
                )) ||
              mode === "edit",
            "max-w-[calc(100%-2.5rem)] sm:max-w-[min(fit-content,80%)]":
              message.role === "user" && mode !== "edit",
          })}
        >
          {attachmentsFromMessage.length > 0 && (
            <div
              className="flex flex-row justify-end gap-2"
              data-testid={"message-attachments"}
            >
              {attachmentsFromMessage.map((attachment) => (
                <PreviewAttachment
                  attachment={{
                    name: attachment.filename ?? "文件",
                    contentType: attachment.mediaType,
                    url: attachment.url,
                  }}
                  key={attachment.url}
                />
              ))}
            </div>
          )}

          {message.parts?.map((part, index) => {
            const { type } = part;
            const key = `message-${message.id}-part-${index}`;

            if (type === "reasoning" && part.text?.trim().length > 0) {
              return (
                <MessageReasoning
                  isLoading={isLoading}
                  key={key}
                  reasoning={part.text}
                />
              );
            }

            if (type === "text") {
              if (mode === "view") {
                // 应用视频内容过滤
                const filteredText = filterVideoContent(part.text);
                const textParts = parseAnnotations(filteredText);

                return (
                  <div key={key}>
                    <MessageContent
                      className={cn({
                        "w-fit break-words rounded-2xl px-3 py-2 text-right text-white":
                          message.role === "user",
                        "bg-transparent px-0 py-0 text-left":
                          message.role === "assistant",
                      })}
                      data-testid="message-content"
                      style={
                        message.role === "user"
                          ? { backgroundColor: "#006cff" }
                          : undefined
                      }
                    >
                      {textParts.map((part, partIndex) => {
                        if (part.type === 'annotation') {
                          return (
                            <span 
                              key={partIndex} 
                              style={{ color: '#0066ff', fontWeight: 500 }}
                            >
                              {part.content}
                            </span>
                          );
                        }
                        return (
                          <Response key={partIndex} onImageEdit={onImageEdit}>
                            {sanitizeText(part.content)}
                          </Response>
                        );
                      })}
                    </MessageContent>
                  </div>
                );
              }

              if (mode === "edit") {
                return (
                  <div
                    className="flex w-full flex-row items-start gap-3"
                    key={key}
                  >
                    <div className="size-8" />
                    <div className="min-w-0 flex-1">
                      <MessageEditor
                        key={message.id}
                        message={message}
                        regenerate={regenerate}
                        sendMessage={sendMessage}
                        setMessages={setMessages}
                        setMode={setMode}
                      />
                    </div>
                  </div>
                );
              }
            }

            if (type === "tool-getWeather") {
              const { toolCallId, state } = part;

              return (
                <Tool defaultOpen={true} key={toolCallId}>
                  <ToolHeader state={state} type="tool-getWeather" />
                  <ToolContent>
                    {state === "input-available" && (
                      <ToolInput input={part.input} />
                    )}
                    {state === "output-available" && (
                      <ToolOutput
                        errorText={undefined}
                        output={<Weather weatherAtLocation={part.output} />}
                      />
                    )}
                  </ToolContent>
                </Tool>
              );
            }

            if (type === "tool-createDocument") {
              const { toolCallId } = part;

              if (part.output && "error" in part.output) {
                return (
                  <div
                    className="rounded-lg border border-red-200 bg-red-50 p-4 text-red-500 dark:bg-red-950/50"
                    key={toolCallId}
                  >
                    创建文档失败：{String(part.output.error)}
                  </div>
                );
              }

              return (
                <DocumentPreview
                  isReadonly={isReadonly}
                  key={toolCallId}
                  result={part.output}
                />
              );
            }

            if (type === "tool-updateDocument") {
              const { toolCallId } = part;

              if (part.output && "error" in part.output) {
                return (
                  <div
                    className="rounded-lg border border-red-200 bg-red-50 p-4 text-red-500 dark:bg-red-950/50"
                    key={toolCallId}
                  >
                    更新文档失败：{String(part.output.error)}
                  </div>
                );
              }

              return (
                <div className="relative" key={toolCallId}>
                  <DocumentPreview
                    args={{ ...part.output, isUpdate: true }}
                    isReadonly={isReadonly}
                    result={part.output}
                  />
                </div>
              );
            }

            if (type === "tool-requestSuggestions") {
              const { toolCallId, state } = part;

              return (
                <Tool defaultOpen={true} key={toolCallId}>
                  <ToolHeader state={state} type="tool-requestSuggestions" />
                  <ToolContent>
                    {state === "input-available" && (
                      <ToolInput input={part.input} />
                    )}
                    {state === "output-available" && (
                      <ToolOutput
                        errorText={undefined}
                        output={
                          "error" in part.output ? (
                            <div className="rounded border p-2 text-red-500">
                              错误：{String(part.output.error)}
                            </div>
                          ) : (
                            <DocumentToolResult
                              isReadonly={isReadonly}
                              result={part.output}
                              type="request-suggestions"
                            />
                          )
                        }
                      />
                    )}
                  </ToolContent>
                </Tool>
              );
            }

            return null;
          })}

          {!isReadonly && (
            <MessageActions
              chatId={chatId}
              isLoading={isLoading}
              key={`action-${message.id}`}
              message={message}
              setMode={setMode}
              vote={vote}
              onImageEdit={onImageEdit}
            />
          )}
        </div>
      </div>
    </div>
  );
};

export const PreviewMessage = memo(
  PurePreviewMessage,
  (prevProps, nextProps) => {
    if (prevProps.isLoading !== nextProps.isLoading) {
      return false;
    }
    if (prevProps.message.id !== nextProps.message.id) {
      return false;
    }
    if (prevProps.requiresScrollPadding !== nextProps.requiresScrollPadding) {
      return false;
    }
    if (!equal(prevProps.message.parts, nextProps.message.parts)) {
      return false;
    }
    if (!equal(prevProps.vote, nextProps.vote)) {
      return false;
    }

    return false;
  }
);

export const ThinkingMessage = () => {
  return (
    <div
      className="group/message fade-in w-full animate-in duration-300"
      data-role="assistant"
      data-testid="message-assistant-loading"
    >
      <div className="flex items-start justify-start gap-3">
        {/* 增强的头像动画 - 添加多层脉动效果 */}
        <div className="relative -mt-1 flex size-8 shrink-0 items-center justify-center">
          {/* 外层脉动光晕 */}
          <div className="absolute inset-0 rounded-full bg-primary/20 animate-ping" />
          {/* 中层脉动光晕 */}
          <div className="absolute inset-0 rounded-full bg-primary/10 animate-pulse" />
          {/* 头像容器 */}
          <div className="relative flex size-8 items-center justify-center rounded-full bg-background ring-2 ring-primary/30">
            <div className="animate-spin text-primary">
            <SparklesIcon size={14} />
            </div>
          </div>
        </div>

        <div className="flex w-full flex-col gap-2">
          {/* 简洁明了的文本 + 动态点 */}
          <div className="flex items-center gap-1.5">
            <span className="text-base font-medium text-foreground">AI 正在思考中</span>
            <span className="flex gap-1">
              <span className="h-2 w-2 rounded-full bg-foreground animate-bounce" style={{ animationDelay: '0ms' }} />
              <span className="h-2 w-2 rounded-full bg-foreground animate-bounce" style={{ animationDelay: '150ms' }} />
              <span className="h-2 w-2 rounded-full bg-foreground animate-bounce" style={{ animationDelay: '300ms' }} />
            </span>
          </div>
        </div>
      </div>
    </div>
  );
};