package com.metaweb.gridworks;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import com.metaweb.gridworks.commands.Command;
import com.metaweb.gridworks.commands.edit.AddColumnCommand;
import com.metaweb.gridworks.commands.edit.ApplyOperationsCommand;
import com.metaweb.gridworks.commands.edit.CreateProjectCommand;
import com.metaweb.gridworks.commands.edit.DoTextTransformCommand;
import com.metaweb.gridworks.commands.edit.JoinMultiValueCellsCommand;
import com.metaweb.gridworks.commands.edit.RemoveColumnCommand;
import com.metaweb.gridworks.commands.edit.SaveProtographCommand;
import com.metaweb.gridworks.commands.edit.SplitMultiValueCellsCommand;
import com.metaweb.gridworks.commands.edit.UndoRedoCommand;
import com.metaweb.gridworks.commands.info.ComputeFacetsCommand;
import com.metaweb.gridworks.commands.info.ExportRowsCommand;
import com.metaweb.gridworks.commands.info.GetAllProjectMetadataCommand;
import com.metaweb.gridworks.commands.info.GetModelsCommand;
import com.metaweb.gridworks.commands.info.GetHistoryCommand;
import com.metaweb.gridworks.commands.info.GetOperationsCommand;
import com.metaweb.gridworks.commands.info.GetProcessesCommand;
import com.metaweb.gridworks.commands.info.GetProjectMetadataCommand;
import com.metaweb.gridworks.commands.info.GetRowsCommand;
import com.metaweb.gridworks.commands.recon.ApproveNewReconcileCommand;
import com.metaweb.gridworks.commands.recon.ApproveReconcileCommand;
import com.metaweb.gridworks.commands.recon.DiscardReconcileCommand;
import com.metaweb.gridworks.commands.recon.JudgeOneCellCommand;
import com.metaweb.gridworks.commands.recon.ReconcileCommand;
import com.metaweb.gridworks.commands.util.GetExpressionLanguageInfoCommand;
import com.metaweb.gridworks.commands.util.PreviewExpressionCommand;
import com.metaweb.gridworks.commands.util.PreviewProtographCommand;

public class GridworksServlet extends HttpServlet {
	private static final long serialVersionUID = 2386057901503517403L;
	
	static protected Map<String, Command> _commands = new HashMap<String, Command>();
	
	static {
		_commands.put("create-project-from-upload", new CreateProjectCommand());
		_commands.put("export-rows", new ExportRowsCommand());
		
		_commands.put("get-project-metadata", new GetProjectMetadataCommand());
		_commands.put("get-all-project-metadata", new GetAllProjectMetadataCommand());
		
		_commands.put("get-models", new GetModelsCommand());
		_commands.put("get-rows", new GetRowsCommand());
		_commands.put("get-processes", new GetProcessesCommand());
		_commands.put("get-history", new GetHistoryCommand());
		_commands.put("get-operations", new GetOperationsCommand());
		
		_commands.put("undo-redo", new UndoRedoCommand());
		_commands.put("apply-operations", new ApplyOperationsCommand());
		
		_commands.put("compute-facets", new ComputeFacetsCommand());
		_commands.put("do-text-transform", new DoTextTransformCommand());
		
		_commands.put("add-column", new AddColumnCommand());
		_commands.put("remove-column", new RemoveColumnCommand());
        _commands.put("join-multi-value-cells", new JoinMultiValueCellsCommand());
        _commands.put("split-multi-value-cells", new SplitMultiValueCellsCommand());
		
		_commands.put("reconcile", new ReconcileCommand());
		_commands.put("approve-reconcile", new ApproveReconcileCommand());
		_commands.put("approve-new-reconcile", new ApproveNewReconcileCommand());
		_commands.put("discard-reconcile", new DiscardReconcileCommand());
		_commands.put("judge-one-cell", new JudgeOneCellCommand());
		
		_commands.put("save-protograph", new SaveProtographCommand());
		
		_commands.put("preview-expression", new PreviewExpressionCommand());
        _commands.put("get-expression-language-info", new GetExpressionLanguageInfoCommand());
        _commands.put("preview-protograph", new PreviewProtographCommand());
	}

	@Override
	public void init() throws ServletException {
		super.init();
	}
	
	@Override
	public void destroy() {
	    if (ProjectManager.singleton != null) {
    		ProjectManager.singleton.saveAllProjects();
    		ProjectManager.singleton.save();
    		ProjectManager.singleton = null;
	    }
		
		super.destroy();
	}
	
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		ProjectManager.initialize(new File("./data"));
		
    	String commandName = request.getPathInfo().substring(1);
    	Command command = _commands.get(commandName);
    	if (command != null) {
    		command.doPost(request, response);
    	}
    }
    
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		ProjectManager.initialize(new File("./data"));
		
    	String commandName = request.getPathInfo().substring(1);
    	Command command = _commands.get(commandName);
    	if (command != null) {
    		command.doGet(request, response);
    	}
    }
    
    static public JSONObject evaluateJsonStringToObject(String s) throws JSONException {
    	JSONTokener t = new JSONTokener(s);
    	JSONObject o = (JSONObject) t.nextValue();
    	return o;
    }
    
    protected String encodeString(String s) {
    	return s.replace("\"", "\\\"");
    }
}