/**
 * RealtimeTranscript 实时转写展示组件
 *
 * 在录音阶段显示讯飞/阿里实时返回的识别文字。
 */

import React, { useEffect, useRef } from 'react'
import type { RealtimeState, RealtimeSegment } from '../hooks/useRealtimeTranscribe'
import { useTranslation } from '../i18n'

interface Props {
  /** 实时转写状态 */
  rtState: RealtimeState
  /** 是否可见 */
  visible: boolean
}

/** 单个说话人分段 */
function SegmentBubble({ seg, isLatest }: { seg: RealtimeSegment; isLatest: boolean }) {
  const isVet = seg.speaker === '兽医'
  return (
    <div className={`flex ${isVet ? 'justify-start' : 'justify-end'} mb-2`}>
      <div className={`max-w-[85%] px-3 py-2 rounded-xl text-sm leading-relaxed transition-all duration-300 ${
        isVet
          ? 'bg-medical-50 text-medical-800 rounded-tl-sm'
          : 'bg-gray-100 text-gray-700 rounded-tr-sm'
      } ${isLatest ? 'shadow-sm ring-1 ring-medical-200' : ''}`}>
        <div className="text-[10px] font-semibold uppercase tracking-wide mb-0.5 opacity-50">
          {seg.speaker || '...'}
        </div>
        <div>{seg.text}</div>
      </div>
    </div>
  )
}

/** 纯文本流式展示（说话人未分离时） */
function StreamingText({ text, connected }: { text: string; connected: boolean }) {
  const scrollRef = useRef<HTMLDivElement>(null)

  useEffect(() => {
    if (scrollRef.current) {
      scrollRef.current.scrollTop = scrollRef.current.scrollHeight
    }
  }, [text])

  if (!text && !connected) return null
  if (!text && connected) {
    return (
      <div className="text-center py-6 text-gray-400 text-sm">
        <div className="inline-flex items-center gap-2">
          <span className="inline-block w-2 h-2 bg-medical-400 rounded-full animate-pulse" />
          正在聆听...
        </div>
      </div>
    )
  }

  return (
    <div ref={scrollRef} className="max-h-64 overflow-y-auto scrollbar-thin">
      <div className="text-gray-700 text-sm leading-relaxed whitespace-pre-wrap">
        {text}
        {connected && (
          <span className="inline-block w-1.5 h-4 bg-medical-400 ml-0.5 align-middle animate-pulse rounded-sm" />
        )}
      </div>
    </div>
  )
}

export default function RealtimeTranscript({ rtState, visible }: Props) {
  const { t } = useTranslation()
  const { fullText, segments, connected, finalized, error, engine } = rtState

  if (!visible) return null

  const hasSegments = segments && segments.length > 0
  const hasText = fullText && fullText.length > 0

  return (
    <div className="mt-4 bg-white/90 backdrop-blur-sm border border-gray-200 rounded-2xl p-4 shadow-sm">
      {/* 头部 */}
      <div className="flex items-center justify-between mb-3">
        <div className="flex items-center gap-2">
          <div className={`w-2 h-2 rounded-full ${
            finalized ? 'bg-emerald-400' : connected ? 'bg-medical-400 animate-pulse' : 'bg-gray-300'
          }`} />
          <span className="text-xs font-medium text-gray-500">
            {finalized ? '转写完成' : connected ? '实时转写中' : '等待连接...'}
          </span>
          {engine && (
            <span className="text-[10px] text-gray-400 bg-gray-100 px-1.5 py-0.5 rounded">
              {engine.replace('xunfei_', '讯飞·')}
            </span>
          )}
        </div>
        {error && (
          <span className="text-xs text-red-500 truncate max-w-[200px]">{error}</span>
        )}
      </div>

      {/* 错误提示 */}
      {error && !hasText && (
        <div className="text-center py-4 text-sm text-red-500">
          <p>{error}</p>
          <p className="text-xs text-gray-400 mt-1">{t('consultation.realtimeTranscribeError')}</p>
        </div>
      )}

      {/* 分段对话模式（说话人已分离） */}
      {hasSegments ? (
        <div className="max-h-72 overflow-y-auto scrollbar-thin">
          {segments.map((seg, i) => (
            <SegmentBubble
              key={`${i}-${seg.speaker}-${seg.text.length}`}
              seg={seg}
              isLatest={i === segments.length - 1 && !finalized}
            />
          ))}
          {connected && !finalized && (
            <div className="flex justify-center py-1">
              <span className="inline-flex gap-1">
                <span className="w-1 h-1 bg-medical-300 rounded-full animate-bounce" style={{ animationDelay: '0ms' }} />
                <span className="w-1 h-1 bg-medical-300 rounded-full animate-bounce" style={{ animationDelay: '150ms' }} />
                <span className="w-1 h-1 bg-medical-300 rounded-full animate-bounce" style={{ animationDelay: '300ms' }} />
              </span>
            </div>
          )}
        </div>
      ) : (
        /* 流式文本模式 */
        <StreamingText text={fullText} connected={connected} />
      )}

      {/* 空状态 */}
      {!hasText && !hasSegments && !connected && !error && (
        <div className="text-center py-4 text-xs text-gray-400">
          开始说话后，文字将实时显示
        </div>
      )}
    </div>
  )
}