'use client';

import { IconButton } from '@/components/ui/button';
import { useAsyncFn } from '@/hooks/tools';
import { cn } from '@/lib/utils';
import { useStreamChatStore } from '@/app/(main)/chat/[id]/stream-chat';
import { useState, useRef, useEffect } from 'react';

const AuthHeightTextarea = (
  props: React.ComponentProps<'textarea'> & {
    maxHeight?: number;
    onSend?: (text: string) => void;
  }
) => {
  const { maxHeight = 200, className, value, onChange, onSend, ...restProps } = props;
  const textareaRef = useRef<HTMLTextAreaElement>(null);

  // 调整高度的函数
  const adjustHeight = () => {
    const textarea = textareaRef.current;
    if (!textarea) return;

    // 先重置高度为 0，这样才能获取真实的 scrollHeight
    textarea.style.height = '0px';

    // 获取内容实际需要的高度
    const scrollHeight = textarea.scrollHeight;

    // 计算新高度：取 scrollHeight 和 maxHeight 的较小值
    const newHeight = Math.min(scrollHeight, maxHeight);
    textarea.style.height = `${newHeight}px`;

    // 如果内容超过最大高度，显示滚动条
    textarea.style.overflowY = scrollHeight > maxHeight ? 'auto' : 'hidden';
  };

  const handleKeyDown = (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
    // Enter 发送，Shift+Enter 换行
    if (e.key === 'Enter' && !e.shiftKey) {
      e.preventDefault(); // 阻止默认的换行行为
      onSend?.(value as string);
    }
  };

  // 监听内容变化，自动调整高度
  useEffect(() => {
    adjustHeight();
  }, [value, maxHeight]);

  return (
    <textarea
      ref={textareaRef}
      value={value}
      onChange={onChange}
      className={cn(
        'w-full resize-none',
        // 移除所有默认样式
        'border-none outline-none focus:outline-none',
        'bg-transparent',
        // 自定义滚动条样式（可选）
        'scrollbar-thin scrollbar-thumb-white/20 scrollbar-track-transparent',
        className
      )}
      style={{
        minHeight: '24px', // 最小高度，一行文字的高度
        height: '24px', // 初始高度
        overflow: 'hidden', // 初始隐藏滚动条
      }}
      onKeyDown={handleKeyDown}
      {...restProps}
    />
  );
};

export default function Input() {
  const [isRecording, setIsRecording] = useState(false);
  const [inputValue, setInputValue] = useState('');
  const sendMessage = useStreamChatStore((state) => state.sendMessage);
  const { run: sendMessageAsync, loading } = useAsyncFn(sendMessage);

  const handleSend = () => {
    if (inputValue.trim()) {
      sendMessageAsync(inputValue);
      setInputValue('');
    }
  };

  return (
    <div className="flex flex-col mb-6 items-end gap-4">
      <div></div>
      <div className="flex w-full items-end gap-4">
        {/* 打电话按钮 */}
        <IconButton onClick={() => {}} iconfont="icon-gift-border" />
        <div className="flex-1 flex items-end gap-2 min-h-12 py-2 px-2 bg-white/15 rounded-3xl">
          {/* 语音录制按钮 */}
          <IconButton
            variant="ghost"
            size="small"
            iconfont="icon-voice_msg"
            className="flex-shrink-0"
          />
          <AuthHeightTextarea
            placeholder="Chat"
            maxHeight={70}
            value={inputValue}
            onChange={(e) => setInputValue(e.target.value)}
            onSend={handleSend}
            className="py-1"
          />
          {/* 提示词提示按钮 */}
          <IconButton
            variant="ghost"
            size="small"
            onClick={() => null}
            className={cn('bg-surface-element-hover flex-shrink-0')}
            iconfont="icon-prompt"
          />
        </div>
        <IconButton
          size="large"
          loading={loading}
          iconfont="icon-icon-send"
          onClick={handleSend}
          disabled={!inputValue.trim()}
          className="flex-shrink-0"
        />
      </div>
    </div>
  );
}