package nico.styTool;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class FileList extends AppCompatActivity
{

    ListView list;
    static List<String> dirs_name;
    static List<String> files_name;
    //缓存上层目录
    /*******************
     *缓存有两种情况被清空
     *1，按返回上层目录之后。
     *2，重新载入Activity后
     ********************/
    static List<String> dirs_name_cache;
    static List<String> files_name_cache;

    Map<String,String> map_paths_name,map_files_name;
    /** Called when the activity is first created. */
    android.support.v7.widget.Toolbar toolbar;

    static String broadcastAction="";
    static String selectedFilePath=null;
    static String curpath="/mnt/sdcard";
    static String filter="";
    List<Map<String, Object>> items;
    Map<String, Object> item;

    @Override
    protected void onStart()
    {
	// TODO: Implement this method
	super.onStart();
	toolbar.setTitle("云工具");
//		设置标题

//		设置副标题
	toolbar.setNavigationIcon(R.drawable.ic_arrow_back_white_24dp);
//		设置导航图标
	toolbar.setNavigationOnClickListener(new View.OnClickListener()
	    {
		@Override
		public void onClick(View p1)
		{
		    finish();
		}
	    });
//		设置导航按钮监听
    }
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
	// TODO: Implement this method
	super.onCreate(savedInstanceState);
	setContentView(R.layout.filelist);

	toolbar = (android.support.v7.widget.Toolbar)
	    findViewById(R.id.toolbar);
//		初始化Toolbar控件
	setSupportActionBar(toolbar);
//		用Toolbar取代ActionBar
	//toolbar.setTitleTextColor(getResources().getColor(R.color.text_font_white));//标题颜色
	//toolbar.setSubtitleTextColor(getResources().getColor(R.color.text_font_white));//副标题颜色

	list = (ListView)findViewById(R.id.file_list);

	try
	{
	    //getListFromPath(curpath);
	    loadList();
	}
	catch (Exception e)
	{//错误时获取根目录
	    curpath = "/";
	    getListFromPath(curpath);
	    loadList();
	}
	//这些事件放在载入列表之后，可以加快载入列表的速度
	//上下文菜单事件
	list.setOnCreateContextMenuListener(new View.OnCreateContextMenuListener(){
		@Override
		public void onCreateContextMenu(ContextMenu p1, View p2, ContextMenu.ContextMenuInfo p3)
		{ 
		    if (((AdapterContextMenuInfo)p3).position > (dirs_name.size() - 1))
			p1.add(0, 0, 0, "查看图片");
		}
	    });
	//设置列表单击事件
	list.setOnItemClickListener(new OnItemClickListener(){

		@Override
		public void onItemClick(AdapterView<?> p1, View p2, int position, long p4)
		{
		    // TODO: Implement this method
		    //点击返回上级时
		    if (position == 0 && !curpath.equals("/"))
		    {
			try
			{
			    curpath = new File(curpath).getParent();
			    //缓存都不为空时才能使用缓存
			    if (dirs_name_cache != null && files_name_cache != null)
			    {
				dirs_name = dirs_name_cache;
				files_name = files_name_cache;
				//使用后清空缓存
				dirs_name_cache = null;
				files_name_cache = null;
			    }
			    else
			    {
				getListFromPath(curpath);
			    }

			    loadList();
			}
			catch (Exception e)
			{
			    showToast("发生了错误！");
			}

		    }

		    //点击文件夹时
		    else if ((position == 0 && curpath.equals("/")) || (position < dirs_name.size() && position != 0))
		    {
			try
			{
			    dirs_name_cache = dirs_name;
			    files_name_cache = files_name;

			    //对根目录的处理
			    if (curpath.equals("/"))
				curpath = "";
			    curpath = curpath + "/" + dirs_name.get(position);
			    getListFromPath(curpath);
			    loadList();
			}
			catch (Exception e)
			{
			    //发生异常时，当前路径不变，并重新载入列表
			    File f=new File(curpath);
			    curpath = f.getParent();
			    getListFromPath(curpath);
			    loadList();
			    showToast("发生了错误！");
			}
		    }
		    //点击文件时
		    else if (position > (dirs_name.size() - 1))
		    {
			//if ((curpath.charAt(curpath.length() - 1) == '/'))
			//curpath = curpath.substring(0, curpath.length() - 1);
			selectedFilePath = curpath + "/" + files_name.get(position - dirs_name.size());

			showToast(selectedFilePath);
			//结束
			//overridePendingTransition(R.anim.null_anim, R.anim.out_to_bottom);
			FileList.this.finish();
			//发送广播
			Intent intent=new Intent();
			intent.setAction(broadcastAction);
			sendBroadcast(intent);
		    }

		}
	    });
    }
//点击Context菜单的项时发生
    @Override
    public boolean onContextItemSelected(MenuItem item)
    {
	AdapterContextMenuInfo menuInfo =
	    (AdapterContextMenuInfo) item.getMenuInfo();
	// TODO: Implement this method
	if (item.getItemId() == 0)
	{
	    //预览
	    Intent intent = new Intent("android.intent.action.VIEW");
	    intent.addCategory("android.intent.category.DEFAULT");
	    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
	    Uri uri = Uri.fromFile(new File(curpath + "/" + files_name.get(menuInfo.position - dirs_name.size())));
	    intent.setDataAndType(uri, "image/*");
	    startActivity(intent);

	}
	return super.onOptionsItemSelected(item);
    }
    //在调用该方法之前务必先调用getListFromPath方法
    public void loadList()
    {
	//getListFromPath(curpath);
	items = new ArrayList<Map<String,Object>>(); 

        for (int i = 0; i < dirs_name.size() ; i++)
	{  
            item = new HashMap<String, Object>();  
            item.put("imageItem", R.drawable.ic_save_white_24dp);  
            item.put("textItem", dirs_name.get(i));  
            items.add(item);  
        }  
	for (int i = 0; i < files_name.size() ; i++)
	{
	    item = new HashMap<String, Object>();  
            item.put("imageItem", R.drawable.image);  
            item.put("textItem", files_name.get(i));  
            items.add(item);  
        }  

	//实例化一个适配器  
        SimpleAdapter adapter = 
	    new SimpleAdapter(this, items,R.layout.filelist_item,new String[]{"imageItem", "textItem",""},new int[]{R.id.filelist_item_iv, R.id.filelist_item_tv});  
        list.setAdapter(adapter);
	//显示的更加人性化
	setTitle(getShortPath(curpath));
	//getActionBar().setTitle(getShortPath(curpath));
    }

    public static String getShortPath(String path)
    {
	int n=0,p=0;
	for (int i=0;i < path.length();i++)
	    if (path.charAt(i) == '/')
		n++;

	if (n >= 3)
	{
	    for (int i=0;i < path.length();i++)
	    {
		if (path.charAt(i) == '/')
		    p++;
		if (p == n - 1)
		{
		    String newPath = "..." + path.substring(i, path.length());
		    return newPath;
		}
	    }
	}

	return path;
    }
    //载入列表到数组
    public static  void getListFromPath(String path)
    {
	files_name = new ArrayList<String>();
        dirs_name = new ArrayList<String>();

        File file = new File(path);
        File[] files = file.listFiles();

	//不是根目录添加返回项
	if (!curpath.equals("/"))
	    dirs_name.add("..");
        for (int i=0;i < files.length;i++)
	{
            //添加文件夹名
            if (files[i].isDirectory())
	    {
		dirs_name.add(files[i].getName() + "");
	    }
	    //文件符合，添加文件名
	    else if (files[i].isFile() && files[i].getName().matches(filter))
	    {
		files_name.add(files[i].getName());
	    }
        }
	//对数组进行排列
	Collections.sort(dirs_name, String.CASE_INSENSITIVE_ORDER);
	Collections.sort(files_name, String.CASE_INSENSITIVE_ORDER);
    }

    public void showToast(String text)
    {
	Toast.makeText(FileList.this, text, 2000).show();
    }

}