/*
 * @Author: ZhaoYing 
 * @Date: 2025-12-10 16:46:17 
 * @Last Modified by: ZhaoYing
 * @Last Modified time: 2026-03-31 15:01:53
 */
import { type FC, useRef, useEffect, useState } from 'react'
import clsx from 'clsx'
import Markdown from '@/components/Markdown'
import type { ChatContentProps } from './types'
import { Spin, Image, Flex, Button } from 'antd'
import { SoundOutlined } from '@ant-design/icons'
import { useTranslation } from 'react-i18next'

import AudioPlayer from './AudioPlayer'
import VideoPlayer from './VideoPlayer'

const getFileUrl = (file: any) => {
  return file.thumbUrl || file.url || (file.originFileObj ? URL.createObjectURL(file.originFileObj) : undefined)
}

/**
 * Chat Content Display Component
 * Responsible for rendering chat message list, supports different role message styles and auto-scrolling
 */
const ChatContent: FC<ChatContentProps> = ({
  classNames,
  contentClassNames,
  data = [],
  streamLoading = false,
  empty,
  labelPosition = 'bottom',
  labelFormat,
  errorDesc,
  renderRuntime,
  onSend
}) => {
  const { t } = useTranslation()
  // Scroll container reference for controlling auto-scroll to bottom
  const scrollContainerRef = useRef<(HTMLDivElement | null)>(null)
  const prevDataLengthRef = useRef(data.length);
  const isScrolledToBottomRef = useRef(true);
  const audioRef = useRef<HTMLAudioElement | null>(null)
  const [expandedReasoning, setExpandedReasoning] = useState<Set<number>>(new Set())
  const [manualToggledReasoning, setManualToggledReasoning] = useState<Set<number>>(new Set())

  const toggleReasoning = (index: number) => {
    setManualToggledReasoning(prev => new Set(prev).add(index))
    setExpandedReasoning(prev => {
      const next = new Set(prev)
      next.has(index) ? next.delete(index) : next.add(index)
      return next
    })
  }

  const isReasoningExpanded = (index: number) => {
    if (manualToggledReasoning.has(index)) return expandedReasoning.has(index)
    return !data[index]?.content
  }
  const [playingIndex, setPlayingIndex] = useState<string | null>(null)

  const handlePlay = (audio_url: string, audio_status?: string) => {
    if (audio_status !== 'completed' && typeof audio_status === 'string') return
    if (playingIndex === audio_url) {
      audioRef.current?.pause()
      setPlayingIndex(null)
      return
    }
    if (audioRef.current) {
      audioRef.current.pause()
    }
    const audio = new Audio(audio_url)
    audioRef.current = audio
    audio.play()
    setPlayingIndex(audio_url)
    audio.onended = () => setPlayingIndex(null)
  }
  
  // Track scroll position to determine if user is at bottom
  useEffect(() => {
    const handleScroll = () => {
      if (scrollContainerRef.current) {
        const { scrollTop, scrollHeight, clientHeight } = scrollContainerRef.current;
        // Consider user is at bottom if within 100px of the bottom
        isScrolledToBottomRef.current = scrollHeight - scrollTop - clientHeight < 100;
      }
    };
    
    const container = scrollContainerRef.current;
    if (container) {
      container.addEventListener('scroll', handleScroll);
      // Initial check
      handleScroll();
    }
    
    return () => {
      if (container) {
        container.removeEventListener('scroll', handleScroll);
      }
    };
  }, []);

  // Auto-scroll to bottom when data changes to show latest messages
  // When data array length remains unchanged, if data is updated and user manually scrolled up, don't auto-scroll to bottom
  // When data array length changes, auto-scroll to bottom
  // If already scrolled to bottom, will auto-scroll to bottom
  useEffect(() => {
    if (playingIndex && !data.some(item => item.meta_data?.audio_url === playingIndex)) {
      audioRef.current?.pause()
      setPlayingIndex(null)
    }
    setTimeout(() => {
      if (scrollContainerRef.current) {
        // Auto-scroll if data length changed OR user is currently at bottom
        if (data.length !== prevDataLengthRef.current || isScrolledToBottomRef.current) {
          scrollContainerRef.current.scrollTop = scrollContainerRef.current.scrollHeight;
          isScrolledToBottomRef.current = true;
        }
        prevDataLengthRef.current = data.length;
      }
    }, 0);
  }, [data])

  const handleDownload = (file: any) => {
    window.open(getFileUrl(file), '_blank')
  }
  return (
    <div ref={scrollContainerRef} className={clsx("rb:relative rb:overflow-y-auto", classNames)}>
      {data.length === 0 
        ? empty // Display empty state
        : data.map((item, index) => (
          <div key={index} className={clsx("rb:relative", {
            'rb:mt-6': index !== 0, // Add top margin for non-first messages
            'rb:right-0 rb:text-right': item.role === 'user', // User messages right-aligned
            'rb:left-0 rb:text-left': item.role === 'assistant', // Assistant messages left-aligned
          })}>
            {/* Don't display if streaming and content is empty */}
            {streamLoading && item.content === '' && !renderRuntime
              ? <Spin />
              : <>
                {/* Top label (such as timestamp, username, etc.) */}
                {labelPosition === 'top' &&
                  <div className="rb:text-[#5B6167] rb:text-[12px] rb:leading-4 rb:font-regular rb:px-1">
                    {labelFormat(item)}
                  </div>
                }
                {item.meta_data?.files && item.meta_data?.files.length > 0 && <Flex gap={8} vertical align="end" className="rb:mb-2!">
                  {item.meta_data?.files?.map((file) => {
                    if (file.type.includes('image')) {
                      return (
                        <div key={file.url || file.uid} className={`rb:inline-block rb:group rb:relative rb:rounded-lg ${contentClassNames}`}>
                          <Image src={getFileUrl(file)} alt={file.name} className="rb:w-full rb:max-w-80 rb:rounded-lg rb:object-cover rb:cursor-pointer" />
                        </div>
                      )
                    }
                    if (file.type.includes('video')) {
                      return (
                        <div key={file.url || file.uid} className="rb:w-50">
                          {/* <video src={getFileUrl(file)} controls className="rb:max-w-80 rb:rounded-lg rb:object-cover rb:cursor-pointer" /> */}
                          <VideoPlayer key={file.url || file.uid} src={getFileUrl(file)} />
                        </div>
                      )
                    }
                    if (file.type.includes('audio')) {
                      return (
                        <div key={file.url || file.uid} className="rb:w-50">
                          <AudioPlayer key={file.url || file.uid} src={getFileUrl(file)} />
                        </div>
                      )
                    }

                    return (
                      <Flex
                        key={file.url || file.uid}
                        align="center"
                        gap={10}
                        className="rb:text-left rb:w-45 rb:text-[12px] rb:group rb:relative rb:rounded-lg rb-border rb:py-2! rb:px-2.5! rb:border rb:border-[#F6F6F6]"
                        onClick={() => handleDownload(file)}
                      >
                        <div
                          className={clsx(
                            "rb:size-5 rb:cursor-pointer rb:bg-cover rb:bg-[url('@/assets/images/conversation/pdf_disabled.svg')]",
                            file.type?.includes('pdf')
                              ? "rb:bg-[url('@/assets/images/file/pdf.svg')]"
                              : (file.type?.includes('excel') || file.type?.includes('spreadsheetml.sheet'))
                              ? "rb:bg-[url('@/assets/images/file/excel.svg')]"
                              : file.type?.includes('csv')
                              ? "rb:bg-[url('@/assets/images/file/csv.svg')]"
                              : file.type?.includes('html')
                              ? "rb:bg-[url('@/assets/images/file/html.svg')]"
                              : file.type?.includes('json')
                              ? "rb:bg-[url('@/assets/images/file/json.svg')]"
                              : file.type?.includes('ppt')
                              ? "rb:bg-[url('@/assets/images/file/ppt.svg')]"
                              : file.type?.includes('text')
                              ? "rb:bg-[url('@/assets/images/file/txt.svg')]"
                              : file.type?.includes('markdown')
                              ? "rb:bg-[url('@/assets/images/file/md.svg')]"
                              : (file.type?.includes('doc') || file.type?.includes('docx') || file.type?.includes('word') || file.type?.includes('wordprocessingml.document'))
                              ? "rb:bg-[url('@/assets/images/file/word.svg')]"
                              : null
                          )}
                        ></div>
                        <div className="rb:flex-1 rb:w-32.5">
                          <div className="rb:leading-4 rb:text-ellipsis rb:overflow-hidden rb:whitespace-nowrap">{file.name}</div>
                          <div className="rb:leading-3.5 rb:mt-0.5 rb:text-[#5B6167] rb:text-ellipsis rb:overflow-hidden rb:whitespace-nowrap">{file.type?.split('/')[file.type?.split('/').length - 1]} · {file.size}</div>
                        </div>
                      </Flex>
                    )
                  })}
                </Flex>}
                {/* Message bubble */}
                <div className={clsx('rb:text-left rb:leading-5 rb:inline-block rb:wrap-break-word rb:relative', item.role === 'user' ? contentClassNames : '', {
                  // Error message style (content is null and not assistant message)
                  'rb:bg-[rgba(255,93,52,0.08)] rb:text-[#FF5D34]': (item.status && item.status !== 'completed') || (errorDesc && item.role === 'assistant' && item.content === null && !renderRuntime),
                  // Assistant message style
                  'rb:bg-[#E3EBFD] rb:p-[10px_12px_2px_12px] rb:rounded-lg rb:max-w-130': item.role === 'user',
                  'rb:max-w-full': item.role === 'assistant',
                  // User message style
                  'rb:text-[#212332]': item.role === 'assistant' && (item.content || item.content === '' || typeof renderRuntime === 'function'),
                  'rb:mt-1': labelPosition === 'top',
                  'rb:mb-1': labelPosition === 'bottom',
                })}>
                  {item.meta_data?.reasoning_content &&
                    <div className={clsx("rb:mb-4 rb-border rb:rounded-xl rb:px-4 rb:pt-4 rb:bg-white", {
                      'rb:hover:bg-[#F6F6F6] rb:w-64': !isReasoningExpanded(index)
                    })}>
                      <Flex
                        align="center"
                        justify="space-between"
                        className="rb:font-medium rb:pb-4!"
                      >
                        <span>{t('memoryConversation.reasoning_content')}</span>
                        <Flex
                          align="center"
                          justify="center"
                          className={clsx("rb:size-6.5 rb:cursor-pointer rb-border rb:rounded-lg", {
                            'rb:hover:bg-[#F6F6F6]!': isReasoningExpanded(index)
                          })}
                          onClick={() => toggleReasoning(index)}
                        >
                          <div
                            className={clsx("rb:size-4 rb:bg-cover", {
                              'rb:bg-[url("@/assets/images/conversation/compress.svg")]': isReasoningExpanded(index),
                              'rb:bg-[url("@/assets/images/conversation/expand.svg")]': !isReasoningExpanded(index)
                            })}
                          ></div>
                      </Flex>
                      </Flex>
                    {isReasoningExpanded(index) && <Markdown content={item.meta_data.reasoning_content} className="rb:text-[#5B6167] rb:text-[12px]" />}
                    </div>
                  }
                  {item.status && <div className="rb:size-5 rb:bg-cover rb:bg-[url('@/assets/images/conversation/exclamation_circle.svg')] rb:absolute rb:-left-7"></div>}
                  {item.subContent && renderRuntime && renderRuntime(item, index)}
                  {/* Render message content using Markdown component */}
                  <Markdown content={renderRuntime ? item.content ?? '' : item.content ?? errorDesc ?? ''} />

                  {item.meta_data?.suggested_questions && item.meta_data?.suggested_questions?.length > 0 && <Flex wrap className="rb:my-1!">
                    {item.meta_data?.suggested_questions?.map((question, idx) => (
                      <Button key={idx} size="small" className="rb:text-[12px]! rb:text-[#155EEF]!"
                        onClick={() => onSend?.(question)}
                      >{question}</Button>
                    ))}
                  </Flex>}
                  {item.meta_data?.citations && item.meta_data?.citations.length > 0 &&
                    <Flex vertical gap={4} className="rb:mt-1! rb:pt-3! rb-border-t rb:mb-2!">
                      <div className="rb:font-medium">{t('memoryConversation.citations')}</div>
                      {item.meta_data?.citations?.map((citation, idx) => (
                        <div
                          key={idx}
                          className="rb:text-[#155EEF] rb:leading-5 rb:underline rb:cursor-pointer"
                          onClick={() => {
                            const params = new URLSearchParams({ documentId: citation.document_id, parentId: citation.knowledge_id });
                            window.open(`/#/knowledge-base/${citation.knowledge_id}/DocumentDetails?${params}`, '_blank');
                          }}
                        >{citation.file_name}</div>
                      ))}
                    </Flex>
                  }
                </div>
                {/* Bottom label (such as timestamp, username, etc.) */}
                {labelPosition === 'bottom' && <Flex gap={16} align="center" justify={item.role === 'user' ? 'end' : 'start'}>
                  {item.meta_data?.audio_url && <>
                    {playingIndex !== item.meta_data?.audio_url && item.meta_data?.audio_status === 'pending'
                      ? <Spin />
                      : playingIndex !== item.meta_data?.audio_url
                        ? <SoundOutlined className={clsx("rb:cursor-pointer rb:size-5.5", {
                          'rb:text-[#FF5D34]': item.meta_data?.audio_status === 'error',
                          'rb:hover:text-[#155EEF]!': !item.meta_data?.audio_status || !['pending', 'error'].includes(item.meta_data?.audio_status)
                        })} onClick={() => handlePlay(item.meta_data?.audio_url!, item.meta_data?.audio_status)} />
                        : <div
                          className="rb:size-5.5 rb:cursor-pointer rb:bg-cover rb:bg-[url('@/assets/images/conversation/audio_ing.gif')]"
                          onClick={() => handlePlay(item.meta_data?.audio_url!, item.meta_data?.audio_status)}
                        />
                    }
                  </>}
                  <div className="rb:text-[#5B6167] rb:text-[12px] rb:leading-4 rb:font-regular">
                    {labelFormat(item)}
                  </div>
                </Flex>
                }
              </>
            }
          </div>
        ))
      }
    </div>
  )
}

export default ChatContent