package com.baidu.ueditor.hunter;

import java.io.File;
import java.util.Arrays;
import java.util.Collection;
import java.util.Map;

import org.apache.commons.io.FileUtils;

import com.baidu.ueditor.core.PathFormat;
import com.baidu.ueditor.define.AppInfo;
import com.baidu.ueditor.define.BaseState;
import com.baidu.ueditor.define.MultiState;
import com.baidu.ueditor.define.State;

public class FileManager {

    private String dir = null;
    private String rootPath = null;
    private String[] allowFiles = null;
    private int count = 0;
    
    public FileManager ( Map<String, Object> conf ) {

        this.rootPath = (String)conf.get( "rootPath" );
        this.dir = this.rootPath + (String)conf.get( "dir" );
        this.allowFiles = this.getAllowFiles( conf.get("allowFiles") );
        this.count = (Integer)conf.get( "count" );
        
    }
    
    public State listFile ( int index ) {
        
        File dir = new File( this.dir );
        State state = null;

        if ( !dir.exists() ) {
            return new BaseState( false, AppInfo.NOT_EXIST );
        }
        
        if ( !dir.isDirectory() ) {
            return new BaseState( false, AppInfo.NOT_DIRECTORY );
        }
        
        Collection<File> list = FileUtils.listFiles( dir, this.allowFiles, true );
        
        if ( index < 0 || index > list.size() ) {
            state = new MultiState( true );
        } else {
            Object[] fileList = Arrays.copyOfRange( list.toArray(), index, index + this.count );
            state = this.getState( fileList );
        }
        
        state.putInfo( "start", index );
        state.putInfo( "total", list.size() );
        
        return state;
        
    }
    
    private State getState ( Object[] files ) {
        
        MultiState state = new MultiState( true );
        BaseState fileState = null;
        
        File file = null;
        
        for ( Object obj : files ) {
            if ( obj == null ) {
                break;
            }
            file = (File)obj;
            fileState = new BaseState( true );
//            fileState.putInfo( "url", PathFormat.format( this.getPathFormat( file ) ) );
            fileState.putInfo( "url", this.getPathFormat( file ) );
            state.addState( fileState );
        }
        
        return state;
        
    }
    
    private String getPathFormat ( File file ) {
        
        String path = file.getAbsolutePath();
        
        path = PathFormat.format(path);
        if(this.rootPath.startsWith("/")){
            if(path.startsWith("/") == false){// 解决Windows下路径问题
                path = "/"+path;
            }
        }
//        System.out.println(this.rootPath+"=="+path);
        return path.replace( this.rootPath, "/" );
        
    }
    
    private String[] getAllowFiles ( Object fileExt ) {
        
        String[] exts = null;
        String ext = null;
        
        if ( fileExt == null ) {
            return new String[ 0 ];
        }
        
        exts = (String[])fileExt;
        
        for ( int i = 0, len = exts.length; i < len; i++ ) {
            
            ext = exts[ i ];
            exts[ i ] = ext.replace( ".", "" );
            
        }
        
        return exts;
        
    }
    
}
