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Copyright 2011, Google Inc.
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    * Redistributions of source code must retain the above copyright
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    * Redistributions in binary form must reproduce the above
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/

package com.google.refine.importing;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

import org.apache.commons.io.FileUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;

import com.google.refine.Jsonizable;
import com.google.refine.ProjectManager;
import com.google.refine.ProjectMetadata;
import com.google.refine.model.Project;
import com.google.refine.util.JSONUtilities;


public class ImportingJob implements Jsonizable {
    final public long id;
    final public File dir; // Temporary directory where the data about this job is stored
    
    private JSONObject config;
    
    public Project project;
    public ProjectMetadata metadata;
    
    public long lastTouched;
    public boolean updating;
    public boolean canceled;
    
    final private Object lock = new Object();
    
    public ImportingJob(long id, File dir) {
        this.id = id;
        this.dir = dir;

        JSONObject cfg = new JSONObject();
        JSONUtilities.safePut(cfg, "state", "new");
        JSONUtilities.safePut(cfg, "hasData", false);
        this.config = cfg;
        
        lastTouched = System.currentTimeMillis();
        
        dir.mkdirs();
    }
    
    
    public JSONObject getOrCreateDefaultConfig() {
        return config;
    }
    
    public void setState(String state) {
        synchronized(config) {
            JSONUtilities.safePut(config, "state", state);        
        }
    }

    public void setError(List<Exception> exceptions) {
        synchronized(config) {
            JSONUtilities.safePut(config, "errors", 
                    DefaultImportingController.convertErrorsToJsonArray(exceptions));
            setState("error");
        }
    }
    
    public void setProjectID(long projectID) {
        synchronized (config) {
            JSONUtilities.safePut(config, "projectID", projectID);
        }
    }

    public void setProgress(int percent, String message) {
        synchronized (config) {
            JSONObject progress = JSONUtilities.getObject(config, "progress");
            if (progress == null) {
                progress = new JSONObject();
                JSONUtilities.safePut(config, "progress", progress);
            }
            JSONUtilities.safePut(progress, "message", message);
            JSONUtilities.safePut(progress, "percent", percent);
            JSONUtilities.safePut(progress, "memory", Runtime.getRuntime().totalMemory() / 1000000);
            JSONUtilities.safePut(progress, "maxmemory", Runtime.getRuntime().maxMemory() / 1000000);
        }
    }

    public void setFileSelection(JSONArray fileSelectionArray) {
        synchronized (config) {
            JSONUtilities.safePut(config, "fileSelection", fileSelectionArray);
        }
    }
    
    public void setRankedFormats(JSONArray rankedFormats) {
        synchronized (config) {
            JSONUtilities.safePut(config, "rankedFormats", rankedFormats);
        }
    }


    public JSONObject getRetrievalRecord() {
        synchronized(config) {
            return JSONUtilities.getObject(config,"retrievalRecord");
        }
    }
    
    
    public List<JSONObject> getSelectedFileRecords() {
        List<JSONObject> results = new ArrayList<JSONObject>();
        
        JSONObject retrievalRecord = JSONUtilities.getObject(config,"retrievalRecord");
        if (retrievalRecord != null) {
            JSONArray fileRecordArray = JSONUtilities.getArray(retrievalRecord, "files");
            if (fileRecordArray != null) {
                JSONArray fileSelectionArray = JSONUtilities.getArray(config,"fileSelection");
                if (fileSelectionArray != null) {
                    for (int i = 0; i < fileSelectionArray.length(); i++) {
                        int index = JSONUtilities.getIntElement(fileSelectionArray, i, -1);
                        if (index >= 0 && index < fileRecordArray.length()) {
                            results.add(JSONUtilities.getObjectElement(fileRecordArray, index));
                        }
                    }
                }
            }
        }
        return results;
    }

    
    public void touch() {
        lastTouched = System.currentTimeMillis();
    }
    
    public void prepareNewProject() {
        if (project != null) {
            project.dispose();
        }
        
        // Make sure all projects have been saved in case we run out of memory 
        // or have some other catastrophe on import
        ProjectManager.singleton.save(true);
        
        project = new Project();
        metadata = new ProjectMetadata();
    }
    
    public void dispose() {
        if (project != null) {
            project.dispose();
            project = null;
        }
        metadata = null;
        
        try {
            FileUtils.deleteDirectory(dir);
        } catch (IOException e) {
        }
    }
    
    public File getRawDataDir() {
        File dir2 = new File(dir, "raw-data");
        dir2.mkdirs();
        return dir2;
    }

    @Override
    public void write(JSONWriter writer, Properties options)
            throws JSONException {
        
        synchronized(lock) {
            writer.object();
            writer.key("config"); writer.value(config);
            writer.endObject();
        }
    }
    
}