import type { KeyboardEvent, ReactNode } from 'react';
import { Send, Square, Upload } from 'lucide-react';
import { Textarea } from 'tdesign-react';
import { useRef } from 'react';

interface ChatInputComposerProps {
  value: string;
  onChange?: (value: string) => void;
  onSend?: () => void;
  onStop?: () => void;
  onKeyDown?: (event: KeyboardEvent<HTMLTextAreaElement>) => void;
  placeholder?: string;
  disabled?: boolean;
  isSending?: boolean;
  isDarkMode: boolean;
  trailingActions?: ReactNode;
  readOnly?: boolean;
  className?: string;
  showBorderTop?: boolean;
  showUpload?: boolean;
  onUploadFile?: (file: File) => void | Promise<void>;
}

export default function ChatInputComposer({
  value,
  onChange,
  onSend,
  onStop,
  onKeyDown,
  placeholder = '输入你的问题...',
  disabled = false,
  isSending = false,
  isDarkMode,
  trailingActions,
  readOnly = false,
  className = '',
  showBorderTop = false,
  showUpload = true,
  onUploadFile,
}: ChatInputComposerProps) {
  const submitEnabled = Boolean(value.trim()) && !disabled && !readOnly && Boolean(onSend);
  const inputRef = useRef<HTMLInputElement | null>(null);
  const iconButtonClass = `rounded-lg p-2 transition-colors ${
    isDarkMode ? 'text-slate-400 hover:bg-slate-600 hover:text-slate-200' : 'text-gray-500 hover:bg-gray-200 hover:text-gray-700'
  }`;

  const handleKeyDown = (val, context) => {
    if (context?.e?.key === 'Enter') {
      // 阻止默认的换行行为（如果是 Textarea）
      context.e.preventDefault();

      // 模拟发送请求
      onSend()
    }
  };

  return (
    <div className={`${showBorderTop ? (isDarkMode ? 'border-t border-slate-700/50' : 'border-t border-red-100') : ''} p-4 ${className}`}>
      <div className={`flex items-end gap-3 rounded-2xl p-3 shadow-inner ${isDarkMode ? 'bg-slate-700/50' : 'bg-gray-100'}`}>
        <Textarea
          value={value}
          onChange={(nextValue) => onChange?.(String(nextValue))}
          onKeydown={handleKeyDown}
          placeholder={placeholder}
          autosize={{ minRows: 1, maxRows: 8 }}
          disabled={disabled}
          readonly={readOnly}
          className={`flex-1 !bg-transparent !border-0 !shadow-none qa-composer-textarea [&]:!border-0 [&]:!shadow-none [&]:!outline-none [&]:focus:!border-0 [&]:focus:!shadow-none [&]:focus:!outline-none [&_.t-textarea]:!border-0 [&_.t-textarea]:!shadow-none [&_.t-textarea]:!outline-none [&_.t-textarea:hover]:!border-0 [&_.t-textarea:hover]:!shadow-none [&_.t-textarea--focused]:!border-0 [&_.t-textarea--focused]:!shadow-none [&_.t-is-focused]:!border-0 [&_.t-is-focused]:!shadow-none [&_.t-textarea__inner]:!min-h-[40px] [&_.t-textarea__inner]:!resize-none [&_.t-textarea__inner]:!bg-transparent [&_.t-textarea__inner]:!border-0 [&_.t-textarea__inner]:!p-0 [&_.t-textarea__inner]:!shadow-none [&_.t-textarea__inner]:!outline-none [&_.t-textarea__inner:hover]:!border-0 [&_.t-textarea__inner:hover]:!shadow-none [&_.t-textarea__inner:focus]:!border-0 [&_.t-textarea__inner:focus]:!shadow-none [&_.t-textarea__inner:focus]:!outline-none [&_.t-textarea__inner]:disabled:!cursor-not-allowed ${
            isDarkMode
              ? '[&_.t-textarea__inner]:!text-white [&_.t-textarea__inner]:placeholder:!text-slate-500'
              : '[&_.t-textarea__inner]:!text-gray-800 [&_.t-textarea__inner]:placeholder:!text-gray-400'
          }`}
        />

        <div className="flex items-center gap-2">
          {showUpload && (
            <>
              <input
                ref={inputRef}
                type="file"
                className="hidden"
                onChange={(event) => {
                  const file = event.target.files?.[0];
                  if (file) {
                    void onUploadFile?.(file);
                  }
                  event.target.value = '';
                }}
              />
              <button
                type="button"
                onClick={() => inputRef.current?.click()}
                disabled={disabled || !onUploadFile}
                className={`${iconButtonClass} ${(disabled || !onUploadFile) ? 'cursor-not-allowed opacity-50 hover:bg-transparent hover:text-inherit' : ''}`}
                title="上传文件"
              >
                <Upload className="h-5 w-5" />
              </button>
            </>
          )}

          {trailingActions && <div className="flex items-center gap-2">{trailingActions}</div>}

          <button
            onClick={isSending ? onStop : onSend}
            disabled={!isSending && !submitEnabled}
            className={`flex items-center gap-2 rounded-xl px-4 py-2 font-medium shadow-sm transition-all ${
              isSending
                ? isDarkMode
                  ? 'bg-rose-600 text-white'
                  : 'bg-red-600 text-white'
                : submitEnabled
                  ? isDarkMode
                    ? 'bg-blue-600 text-white hover:bg-blue-700'
                    : 'bg-red-500 text-white hover:bg-red-600'
                  : isDarkMode
                    ? 'cursor-not-allowed bg-slate-600 text-slate-400'
                    : 'cursor-not-allowed bg-gray-300 text-gray-500'
            }`}
            type="button"
            title={isSending ? '停止' : '发送'}
          >
            {isSending ? <Square className="h-4 w-4 fill-current" /> : <Send className="h-4 w-4" />}
            {isSending ? '停止' : '发送'}
          </button>
        </div>
      </div>
    </div>
  );
}