import React, { useRef, useState } from "react";
import { Image as ImageIcon, Send, Trash2 } from "lucide-react";
import { MessageBlock } from "./types";
import { useUploadFile } from "@/app/service/domain/service";

interface InputBarProps {
  onSend: (blocks: MessageBlock[]) => void;
}

export function InputBar({ onSend }: InputBarProps) {
  const [text, setText] = useState("");
  const [isUploading, setIsUploading] = useState(false);
  const [uploadProgress, setUploadProgress] = useState(0);
  const [imageUrl, setImageUrl] = useState<string | null>(null);

  const { uploadFile } = useUploadFile();

  const handleSend = () => {
    const blocks: MessageBlock[] = [];
    if (text.trim()) blocks.push({ type: "text" as const, text: text.trim() });
    if (imageUrl) blocks.push({ type: "image" as const, url: imageUrl });
    if (!blocks.length) return;
    
    onSend(blocks);
    setText("");
    setImageUrl(null);
  };

  const handleFileUpload = async (file: File) => {
    try {
      setIsUploading(true);
      const url = await uploadFile(file, (progress) => {
        setUploadProgress(progress);
      });
      setImageUrl(url);
    } catch (error) {
      console.error("上传失败:", error);
      // 可以添加错误提示
    } finally {
      setIsUploading(false);
      setUploadProgress(0);
    }
  };

  const onFileChange = async (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    // 保存对 input 元素的引用
    const inputElement = e.currentTarget;
    
    if (file) {
      if (!file.type.startsWith('image/')) {
        alert('请选择图片文件');
        inputElement.value = ""; // 重置 input
        return;
      }
      await handleFileUpload(file);
      // 使用保存的引用重置 input
      inputElement.value = "";
    }
  };

  const removeImage = () => {
    setImageUrl(null);
  };

  return (
    <div data-alt="input-bar">
      {/* 图片预览 */}
      {imageUrl && (
        <div className="px-3 pt-3" data-alt="image-preview">
          <div className="relative group w-24 h-24">
            <img
              src={imageUrl}
              className="h-full w-full object-cover rounded-xl border border-white/10"
              alt="预览图"
            />
            <button
              onClick={removeImage}
              className="absolute top-1 right-1 opacity-0 group-hover:opacity-100 transition bg-black/60 text-white rounded-full p-1"
              title="移除"
              data-alt="remove-image-button"
            >
              <Trash2 size={14} />
            </button>
          </div>
        </div>
      )}

      {/* 上传进度 */}
      {isUploading && (
        <div className="px-3 py-2">
          <div className="w-full bg-gray-200 rounded-full h-1">
            <div
              className="bg-blue-500 h-1 rounded-full transition-all duration-300"
              style={{ width: `${uploadProgress}%` }}
            />
          </div>
        </div>
      )}

      <div className="flex items-center gap-2 px-3 m-3 border border-gray-700 rounded-[2rem]">
        {/* 图片上传 */}
        <label 
          className={`cursor-pointer inline-flex items-center gap-2 p-2 my-2 rounded-full hover:bg-gray-700/50 text-gray-100 ${isUploading ? 'opacity-50 cursor-not-allowed' : ''}`} 
          data-alt="file-upload"
        >
          <ImageIcon size={16} />
          <input
            className="hidden"
            type="file"
            accept="image/*"
            onChange={onFileChange}
            disabled={isUploading}
          />
        </label>

        {/* 文本输入 */}
        <input
          className="flex-1 bg-transparent text-gray-100 px-3 py-2 outline-none placeholder:text-gray-400"
          placeholder="输入文字…"
          value={text}
          onChange={(e) => setText(e.target.value)}
          onKeyDown={(e) => {
            if (e.key === "Enter" && !e.shiftKey) {
              e.preventDefault();
              handleSend();
            }
          }}
          data-alt="text-input"
        />

        {/* 发送按钮 */}
        <button
          onClick={handleSend}
          className="inline-flex items-center gap-2 p-2 my-2 rounded-full bg-blue-500 hover:bg-blue-400 text-white shadow disabled:bg-gray-500 disabled:hover:bg-gray-500 disabled:cursor-not-allowed"
          data-alt="send-button"
          disabled={!text.trim() && !imageUrl}
        >
          <Send size={18} />
        </button>
      </div>
    </div>
  );
}