package com.baidu.ueditor.core;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import com.baidu.ueditor.define.ActionMap;
import com.baidu.ueditor.define.AppInfo;
import com.baidu.ueditor.define.BaseState;
import com.baidu.ueditor.define.State;
import com.baidu.ueditor.hunter.FileManager;
import com.baidu.ueditor.hunter.ImageHunter;
import com.baidu.ueditor.upload.Uploader;

public class ActionEnter {
    
    private HttpServletRequest request = null;
    
    private String rootPath = null;
    private String contextPath = null;
    
    private String actionType = null;
    
    private ConfigManager configManager = null;

    public ActionEnter ( HttpServletRequest request, String rootPath ) {
        
        this.request = request;
        this.rootPath = rootPath;
        this.actionType = request.getParameter( "action" );
        this.contextPath = request.getContextPath();
        this.configManager = ConfigManager.getInstance( this.rootPath, this.contextPath, request.getRequestURI() );
        
    }
    
    public String exec () {
        
        String callbackName = this.request.getParameter("callback");
        
        if ( callbackName != null ) {

            if ( !validCallbackName( callbackName ) ) {
                return new BaseState( false, AppInfo.ILLEGAL ).toJSONString();
            }
            
            return callbackName+"("+this.invoke()+");";
            
        } else {
            return this.invoke();
        }

    }
    
    public String invoke() {
        
        if ( actionType == null || !ActionMap.mapping.containsKey( actionType ) ) {
            return new BaseState( false, AppInfo.INVALID_ACTION ).toJSONString();
        }
        
        if ( this.configManager == null || !this.configManager.valid() ) {
            return new BaseState( false, AppInfo.CONFIG_ERROR ).toJSONString();
        }
        
        State state = null;
        
        int actionCode = ActionMap.getType( this.actionType );
        
        Map<String, Object> conf = null;
        
        switch ( actionCode ) {
        
            case ActionMap.CONFIG:
                return this.configManager.getAllConfig().toString();
                
            case ActionMap.UPLOAD_IMAGE:
            case ActionMap.UPLOAD_SCRAWL:
            case ActionMap.UPLOAD_VIDEO:
            case ActionMap.UPLOAD_FILE:
                conf = this.configManager.getConfig( actionCode );
                state = new Uploader( request, conf ).doExec();
                break;
                
            case ActionMap.CATCH_IMAGE:
                conf = configManager.getConfig( actionCode );
                String[] list = this.request.getParameterValues( (String)conf.get( "fieldName" ) );
                state = new ImageHunter( conf ).capture( list );
                break;
                
            case ActionMap.LIST_IMAGE:
            case ActionMap.LIST_FILE:
                conf = configManager.getConfig( actionCode );
                int start = this.getStartIndex();
                state = new FileManager( conf ).listFile( start );
                break;
                
        }
        
        return state.toJSONString();
        
    }
    
    public int getStartIndex () {
        
        String start = this.request.getParameter( "start" );
        
        try {
            return Integer.parseInt( start );
        } catch ( Exception e ) {
            return 0;
        }
        
    }
    
    /**
     * callback参数验证
     */
    public boolean validCallbackName ( String name ) {
        
        if ( name.matches( "^[a-zA-Z_]+[\\w0-9_]*$" ) ) {
            return true;
        }
        
        return false;
        
    }
    
}