uoa-monitor-service/src/main/java/eu/dnetlib/uoamonitorservice/controllers/TopicController.java

package eu.dnetlib.uoamonitorservice.controllers;

import eu.dnetlib.uoamonitorservice.dao.*;
import eu.dnetlib.uoamonitorservice.entities.Category;
import eu.dnetlib.uoamonitorservice.entities.Stakeholder;
import eu.dnetlib.uoamonitorservice.entities.SubCategory;
import eu.dnetlib.uoamonitorservice.entities.Topic;
import eu.dnetlib.uoamonitorservice.handlers.EntityNotFoundException;
import eu.dnetlib.uoamonitorservice.handlers.PathNotValidException;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.ArrayList;
import java.util.List;

@RestController
@CrossOrigin(origins = "*")
public class TopicController {
    private final Logger log = Logger.getLogger(this.getClass());

    @Autowired
    private StakeholderDAO stakeholderDAO;

    @Autowired
    private TopicDAO topicDAO;

    @Autowired
    private CategoryDAO categoryDAO;

    @Autowired
    private SubCategoryDAO subCategoryDAO;

    @Autowired
    private IndicatorDAO indicatorDAO;

    @Autowired
    private CategoryController categoryController;

    public Topic<Category> buildTopic(Topic<Category> topicFull) {
        Topic<String> topic = new Topic<>(topicFull);

        List<String> categories = new ArrayList<>();
        List<Category> categoriesFull = new ArrayList<>();
        for(Category<SubCategory> category : topicFull.getCategories()) {
            Category<SubCategory> categoryFull = categoryController.buildCategory(category);
            categoriesFull.add(categoryFull);
            categories.add(categoryFull.getId());
        }
        topicFull.setCategories(categoriesFull);
        topic.setCategories(categories);

        topicDAO.save(topic);

        topicFull.setId(topic.getId());
        return topicFull;
    }

    @RequestMapping(value = "/{stakeholderId}/save", method = RequestMethod.POST)
    public Topic<Category> saveTopic(@PathVariable("stakeholderId") String stakeholderId,
                                     @RequestBody Topic<Category> topicFull) {
        log.debug("save topic");
        log.debug("Alias: "+topicFull.getAlias() + " - Id: "+topicFull.getId()+ " - Stakeholder: "+stakeholderId);

        Stakeholder<String> stakeholder = stakeholderDAO.findById(stakeholderId);

        if(stakeholder != null) {

            Topic<String> topic = new Topic<>(topicFull);

            List<String> categories = new ArrayList<>();
            for(Category category : topicFull.getCategories()) {
                categories.add(category.getId());
            }
            topic.setCategories(categories);

            topicDAO.save(topic);

            if(stakeholder.getDefaultId() == null) {
                if(topicFull.getId() == null) {
                    onSaveDefaultTopic(topic, stakeholderId);
                } else {
                    onUpdateDefaultTopic(topic);
                }
            }

            List<String> topics = stakeholder.getTopics();
            int index = topics.indexOf(topic.getId());
            if(index == -1) {
                topics.add(topic.getId());
                stakeholderDAO.save(stakeholder);
                log.debug("Topic saved!");

                topicFull.setId(topic.getId());
            }

            categories = null;
            topic = null;
        } else {
            // EXCEPTION - Stakeholder not found
            throw new EntityNotFoundException("Save topic: Stakeholder with id: "+stakeholderId+" not found");
        }
        return topicFull;
    }

    public void onSaveDefaultTopic(Topic topic, String stakeholderId) {
        log.debug("On save default topic");

        List<Stakeholder> stakeholders = stakeholderDAO.findByDefaultId(stakeholderId);
        for(Stakeholder _stakeholder : stakeholders) {
            Topic topicNew = new Topic();
            topicNew.copyFromDefault(topic);

            topicDAO.save(topicNew);

            List<String> topics = _stakeholder.getTopics();
            topics.add(topicNew.getId());

            stakeholderDAO.save(_stakeholder);
        }
    }

    public void onUpdateDefaultTopic(Topic topic) {
        log.debug("On update default topic");

        List<Topic> topics = topicDAO.findByDefaultId(topic.getId());
        boolean changed = false;
        for(Topic topicBasedOnDefault : topics) {
            if(topic.getName() != null && !topic.getName().equals(topicBasedOnDefault.getName())) {
                changed = true;
            }
            if(topic.getDescription() != null && !topic.getDescription().equals(topicBasedOnDefault.getDescription())) {
                changed = true;
            }

            if(!changed) {
                break;
            }
            topicBasedOnDefault.setName(topic.getName());
            topicBasedOnDefault.setDescription(topic.getDescription());
            topicDAO.save(topicBasedOnDefault);
        }
    }

    @RequestMapping(value = "/{stakeholderId}/{topicId}/delete", method = RequestMethod.DELETE)
    public boolean deleteTopic(@PathVariable("stakeholderId") String stakeholderId,
                               @PathVariable("topicId") String topicId) {
        log.debug("delete topic");
        log.debug("Id: "+topicId + " - Stakeholder: "+stakeholderId);

        Stakeholder<String> stakeholder = stakeholderDAO.findById(stakeholderId);

        if(stakeholder != null) {

            Topic<String> topic = topicDAO.findById(topicId);
            if(topic != null) {

                List<String> topics = stakeholder.getTopics();
                int index = topics.indexOf(topicId);
                if(index != -1) {
                    for(String categoryId : topic.getCategories()) {
                        Category<String> category = categoryDAO.findById(categoryId);
                        if(category == null) {
                            // EXCEPTION - Category not found
                            throw new EntityNotFoundException("Delete topic: Category with id: "+categoryId+" not found (category exists in topic: "+topicId+")");
                        }

                        for(String subCategoryId : category.getSubCategories()) {
                            SubCategory<String> subcategory = subCategoryDAO.findById(subCategoryId);
                            if (subcategory == null) {
                                // EXCEPTION - SubCategory not found
                                throw new EntityNotFoundException("Delete stakeholder: SubCategory with id: "+subCategoryId+" not found (subcategory exists in category: "+categoryId+")");
                            }

                            for (String chartId : subcategory.getCharts()) {
                                indicatorDAO.delete(chartId);
                            }
                            subcategory.setCharts(null);

                            for (String numberId : subcategory.getNumbers()) {
                                indicatorDAO.delete(numberId);
                            }
                            subcategory.setNumbers(null);

                            subCategoryDAO.delete(subCategoryId);
                        }
                        category.setSubCategories(null);
                        categoryDAO.delete(categoryId);
                    }
                    topic.setCategories(null);

                    topics.remove(index);
                    stakeholderDAO.save(stakeholder);

                    topicDAO.delete(topicId);
                    log.debug("Category deleted!");
                } else {
                    // EXCEPTION - Topic not found in Stakeholder: stakeholder.getAlias();
                    throw new PathNotValidException("Delete topic: Topic with id: "+topicId+" not found in Stakeholder: "+stakeholderId);
                }

            } else {
                // EXCEPTION - Topic not found
                throw new EntityNotFoundException("Delete topic: Topic with id: "+topicId+" not found");
            }
        } else {
            // EXCEPTION - Stakeholder not found
            throw new EntityNotFoundException("Delete topic: Stakeholder with id: "+stakeholderId+" not found");
        }
        return true;
    }
}