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/**
 * Copyright (c) 2011-2013, kidzhou 周磊 ([email protected])
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.janeluo.jfinalplus.render.excel;

import com.google.common.collect.Maps;
import com.jfinal.render.Render;
import com.jfinal.render.RenderException;
import net.sf.jxls.transformer.XLSTransformer;
import org.apache.poi.ss.usermodel.Workbook;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.Map;

public class JxlsRender extends Render {

	private static final String CONTENT_TYPE = "application/vnd.ms-excel;charset=" + getEncoding();

    public static JxlsRender me(String templetFile) {
        return new JxlsRender(templetFile);
    }
    private Map beans = Maps.newHashMap();
    private String filename = "file1.xls";

    private String templetFile;

    public JxlsRender(String templetFile) {
        this.templetFile = templetFile;
    }

    public JxlsRender beans(Map beans) {
        this.beans = beans;
        return this;
    }

    private void buildBean() {
        Enumeration attrs = request.getAttributeNames();
        while (attrs.hasMoreElements()) {
            String key = attrs.nextElement();
            Object value = request.getAttribute(key);
            beans.put(key, value);
        }

    }

    public JxlsRender filename(String filename) {
        this.filename = filename;
        return this;
    }

    @Override
    public void render() {
        if (beans.isEmpty()) {
            buildBean();
        }
        response.setContentType(CONTENT_TYPE);
        response.setHeader("Content-Disposition", "attachment;Filename=" + filename);
        try {
            OutputStream out = response.getOutputStream();
            InputStream is = new BufferedInputStream(new FileInputStream(templetFile));
            XLSTransformer transformer = new XLSTransformer();
            Workbook workBook = transformer.transformXLS(is, beans);
            workBook.write(out);
        } catch (Exception e) {
            throw new RenderException(e);
        }

    }

    public JxlsRender templetFile(String templetFile) {
        this.templetFile = templetFile;
        return this;
    }

}