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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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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/

package com.google.refine.commands.project;

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

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

import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.refine.commands.Command;
import com.google.refine.commands.HttpHeadersSupport;
import com.google.refine.commands.HttpHeadersSupport.HttpHeaderInfo;
import com.google.refine.expr.MetaParser;
import com.google.refine.expr.MetaParser.LanguageInfo;
import com.google.refine.importing.ImportingJob;
import com.google.refine.importing.ImportingManager;
import com.google.refine.model.ColumnModel;
import com.google.refine.model.OverlayModel;
import com.google.refine.model.Project;
import com.google.refine.model.RecordModel;

public class GetModelsCommand extends Command {
	
	/**
	 * This command uses POST but is left CSRF-unprotected as it does not incur a state change.
	 */
	
    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        internalRespond(request, response);
    }
    
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        internalRespond(request, response);
    }
    
    protected static class ModelsResponse {
        @JsonProperty("columnModel")
        protected ColumnModel columnModel;
        @JsonProperty("recordModel")
        protected RecordModel recordModel;
        @JsonProperty("overlayModels")
        protected Map<String, OverlayModel> overlayModels;
        @JsonProperty("scripting")
        protected Map<String, LanguageInfo> scripting;
        @JsonProperty("httpHeaders")
        protected Map<String, HttpHeaderInfo> httpHeaders;
        
        protected ModelsResponse(
                ColumnModel columns,
                RecordModel records,
                Map<String, OverlayModel> overlays,
                Map<String, LanguageInfo> languageInfos,
                Map<String, HttpHeaderInfo> headers) {
            columnModel = columns;
            recordModel = records;
            overlayModels = overlays;
            scripting = languageInfos;
            httpHeaders = headers;
        }
    }
    
    protected void internalRespond(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        
        Project project = null;
        
        // This command also supports retrieving rows for an importing job.
        String importingJobID = request.getParameter("importingJobID");
        if (importingJobID != null) {
            long jobID = Long.parseLong(importingJobID);
            ImportingJob job = ImportingManager.getJob(jobID);
            if (job != null) {
                project = job.project;
            }
        }
        if (project == null) {
            project = getProject(request);
        }
        
        response.setHeader("Cache-Control", "no-cache");

        Map<String, LanguageInfo> prefixesMap = new HashMap<>();
        for (String languagePrefix : MetaParser.getLanguagePrefixes()) {
            LanguageInfo info = MetaParser.getLanguageInfo(languagePrefix);
            prefixesMap.put(languagePrefix, info);
        }
        
        Map<String, HttpHeaderInfo> headersMap = new HashMap<>();
        for (String headerLabel : HttpHeadersSupport.getHttpHeaderLabels()) {
            HttpHeaderInfo info = HttpHeadersSupport.getHttpHeaderInfo(headerLabel);
            headersMap.put(headerLabel, info);
        }

        respondJSON(response, new ModelsResponse(
                project.columnModel,
                project.recordModel,
                project.overlayModels,
                prefixesMap,
                headersMap));
    }

}
