package com.java110.common.api;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.activiti.editor.constants.ModelDataJsonConstants;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Model;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.*;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

/**
 * @author luobaimang
 * @date 2019/11/28
 */
@RestController
@RequestMapping("service")
public class ModelRestController implements ModelDataJsonConstants {

        protected static final Logger LOGGER = LoggerFactory.getLogger(ModelRestController.class);

        @Autowired
        private RepositoryService repositoryService;

        @Autowired
        private ObjectMapper objectMapper;

        /**
         * 更新流程
         *
         * @param modelId     模型ID
         * @param name        流程模型名称
         * @param description
         * @param json_xml    流程文件
         * @param svg_xml     图片
         */
        @RequestMapping(value = "/model/{modelId}/save", method = RequestMethod.PUT)
        @ResponseStatus(value = HttpStatus.OK)
        public void saveModel(@PathVariable String modelId
                , String name, String description
                , String json_xml, String svg_xml) {
            try {

                Model model = repositoryService.getModel(modelId);

                ObjectNode modelJson = (ObjectNode) objectMapper.readTree(model.getMetaInfo());

                modelJson.put(MODEL_NAME, name);
                modelJson.put(MODEL_DESCRIPTION, description);
                modelJson.put(ModelDataJsonConstants.MODEL_REVISION, model.getVersion() + 1);
                model.setMetaInfo(modelJson.toString());
                model.setName(name);
                repositoryService.saveModel(model);

                repositoryService.addModelEditorSource(model.getId(), json_xml.getBytes("utf-8"));

                InputStream svgStream = new ByteArrayInputStream(svg_xml.getBytes("utf-8"));
                TranscoderInput input = new TranscoderInput(svgStream);

                PNGTranscoder transcoder = new PNGTranscoder();
                // Setup output
                ByteArrayOutputStream outStream = new ByteArrayOutputStream();
                TranscoderOutput output = new TranscoderOutput(outStream);

                // Do the transformation
                transcoder.transcode(input, output);
                final byte[] result = outStream.toByteArray();
                repositoryService.addModelEditorSourceExtra(model.getId(), result);
                outStream.close();
            } catch (Exception e) {
                LOGGER.error("Error saving model", e);
                throw new ActivitiException("Error saving model", e);
            }
        }


    /**
     * 获取model的节点信息，编辑器根据返回的json进行绘图
     *
     * @param modelId
     * @return
     */
    @SuppressWarnings("deprecation")
    @RequestMapping(value = "/model/{modelId}/json", method = RequestMethod.GET, produces = "application/json")
    public ObjectNode getEditorJson(@PathVariable String modelId) {
        ObjectNode modelNode = null;
        Model model = repositoryService.getModel(modelId);
        if (model != null) {
            try {
                if (StringUtils.isNotEmpty(model.getMetaInfo())) {
                    modelNode = (ObjectNode) objectMapper.readTree(model.getMetaInfo());
                } else {
                    modelNode = objectMapper.createObjectNode();
                    modelNode.put(MODEL_NAME, model.getName());
                }
                modelNode.put(MODEL_ID, model.getId());
                ObjectNode editorJsonNode = (ObjectNode) objectMapper.readTree(
                        new String(repositoryService.getModelEditorSource(model.getId()), "utf-8"));
                modelNode.put("model", editorJsonNode);
            } catch (Exception e) {
                LOGGER.error("Error creating model JSON", e);
                throw new ActivitiException("Error creating model JSON", e);
            }
        }
        return modelNode;
    }

    /**
     * 获取编辑器组件及配置项信息
     * 获取流程json文件
     *
     * @return
     */
    @RequestMapping(value = "/editor/stencilset", method = RequestMethod.GET, produces = "application/json;charset=utf-8")
    @ResponseBody
    public String getStencilset() {
        InputStream stencilsetStream = this.getClass().getClassLoader().getResourceAsStream("stencilset.json");
        try {
            return IOUtils.toString(stencilsetStream, "utf-8");
        } catch (Exception e) {
            throw new ActivitiException("Error while loading stencil set", e);
        }
    }
}