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/*
 * Copyright 2014-2015 the original author or authors.
 *
 * 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.deepoove.poi.policy;

import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.InputStream;

import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFRun;

import com.deepoove.poi.XWPFTemplate;
import com.deepoove.poi.data.PictureRenderData;
import com.deepoove.poi.template.run.RunTemplate;

public class PictureRenderPolicy extends AbstractRenderPolicy {
	
	static final int EMU = 9525;

    @Override
    protected boolean validate(Object data) {
        if (null == data) return false;

        if (!(data instanceof PictureRenderData)) {
            logger.error("Error datamodel: correct type is PictureRenderData, but is "
                    + data.getClass());
            return false;
        }

        return (null != ((PictureRenderData) data).getData()
                || null != ((PictureRenderData) data).getPath());
    }

    @Override
    public void doRender(RunTemplate runTemplate, Object model, XWPFTemplate template)
            throws Exception {
    	XWPFRun run = runTemplate.getRun();
        // 如果出现异常，图片不存在，优先清空标签
        clearPlaceholder(run);

        PictureRenderData picture = (PictureRenderData) model;
        int suggestFileType = suggestFileType(picture.getPath());

        InputStream ins = null == picture.getData() ? new FileInputStream(picture.getPath()) : new ByteArrayInputStream(picture.getData());
        
        run.addPicture(ins, suggestFileType, "Generated", picture.getWidth()*EMU,
                picture.getHeight()*EMU);
    }

    public static int suggestFileType(String imgFile) {
        int format = 0;

        if (imgFile.endsWith(".emf")) format = XWPFDocument.PICTURE_TYPE_EMF;
        else if (imgFile.endsWith(".wmf")) format = XWPFDocument.PICTURE_TYPE_WMF;
        else if (imgFile.endsWith(".pict")) format = XWPFDocument.PICTURE_TYPE_PICT;
        else if (imgFile.endsWith(".jpeg") || imgFile.endsWith(".jpg"))
            format = XWPFDocument.PICTURE_TYPE_JPEG;
        else if (imgFile.endsWith(".png")) format = XWPFDocument.PICTURE_TYPE_PNG;
        else if (imgFile.endsWith(".dib")) format = XWPFDocument.PICTURE_TYPE_DIB;
        else if (imgFile.endsWith(".gif")) format = XWPFDocument.PICTURE_TYPE_GIF;
        else if (imgFile.endsWith(".tiff")) format = XWPFDocument.PICTURE_TYPE_TIFF;
        else if (imgFile.endsWith(".eps")) format = XWPFDocument.PICTURE_TYPE_EPS;
        else if (imgFile.endsWith(".bmp")) format = XWPFDocument.PICTURE_TYPE_BMP;
        else if (imgFile.endsWith(".wpg")) format = XWPFDocument.PICTURE_TYPE_WPG;
        else {
            logger.error("Unsupported picture: " + imgFile
                    + ". Expected emf|wmf|pict|jpeg|png|dib|gif|tiff|eps|bmp|wpg");
        }
        return format;
    }

}