/*

Copyright 2011, Google Inc.
All rights reserved.

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modification, are permitted provided that the following conditions are
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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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contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           
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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 org.apache.commons.io.FileUtils;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonRawValue;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.google.refine.ProjectManager;
import com.google.refine.ProjectMetadata;
import com.google.refine.model.Project;
import com.google.refine.util.JSONUtilities;
import com.google.refine.util.ParsingUtilities;


public class ImportingJob  {
    final public long id;
    final public File dir; // Temporary directory where the data about this job is stored
    
    private ObjectNode 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;

        ObjectNode cfg = ParsingUtilities.mapper.createObjectNode();
        JSONUtilities.safePut(cfg, "state", "new");
        JSONUtilities.safePut(cfg, "hasData", false);
        this.config = cfg;
        
        lastTouched = System.currentTimeMillis();
        
        dir.mkdirs();
    }
    
    @JsonProperty("config")
    @JsonRawValue
    public String getJsonConfig() {
        return config.toString();
    }
    
    @JsonIgnore
    public ObjectNode 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) {
            ObjectNode progress = JSONUtilities.getObject(config, "progress");
            if (progress == null) {
                progress = ParsingUtilities.mapper.createObjectNode();
                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(ArrayNode fileSelectionArray) {
        synchronized (config) {
            JSONUtilities.safePut(config, "fileSelection", fileSelectionArray);
        }
    }
    
    public void setRankedFormats(ArrayNode rankedFormats) {
        synchronized (config) {
            JSONUtilities.safePut(config, "rankedFormats", rankedFormats);
        }
    }


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