package eu.dnetlib.uoamonitorservice.controllers;

import eu.dnetlib.uoamonitorservice.dto.TopicFull;
import eu.dnetlib.uoamonitorservice.entities.Stakeholder;
import eu.dnetlib.uoamonitorservice.entities.Topic;
import eu.dnetlib.uoamonitorservice.primitives.Visibility;
import eu.dnetlib.uoamonitorservice.service.StakeholderService;
import eu.dnetlib.uoamonitorservice.service.TopicService;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;

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

    private TopicService topicService;
    private StakeholderService stakeholderService;

    @Autowired
    public TopicController(TopicService topicService, StakeholderService stakeholderService) {
        this.topicService = topicService;
        this.stakeholderService = stakeholderService;
    }

    /*@PreAuthorize("isAuthenticated()")
    @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 stakeholder = stakeholderDAO.findById(stakeholderId);

        if(stakeholder != null) {
            if(!rolesUtils.hasUpdateAuthority(stakeholder.getType(), stakeholder.getAlias())) {
                // EXCEPTION - Access denied
                throw new ForbiddenException("Save Topic: You are not authorized to update stakeholder with id: "+stakeholderId);
            }

            Topic<String> topic = new Topic<>(topicFull);
            Date date = new Date();
            topic.setUpdateDate(date);
            topicFull.setUpdateDate(date);

            List<String> categories = new ArrayList<>();

            Topic<String> oldTopic = null;
            if(topicFull.getId() != null) {
                oldTopic = topicDAO.findById(topicFull.getId());
                if(oldTopic == null) {
                    // EXCEPTION - Topic not found
                    throw new EntityNotFoundException("save topic: Topic with id: "+topicFull.getId()+" not found");
                }
                for(String categoryId : oldTopic.getCategories()) {
                    Category category = categoryDAO.findById(categoryId);
                    if (category == null) {
                        // EXCEPTION - Category not found
                        throw new EntityNotFoundException("Save topic: Category with id: "+categoryId+" not found (category exists in topic: "+topic.getId()+")");
                    }
                    categories.add(category.getId());
                }
            } else { // topic does not exist in DB
                topic.setCreationDate(date);
                topicFull.setCreationDate(date);

                for(Category category : topicFull.getCategories()) {
                    categories.add(category.getId());
                }
            }

            topic.setCategories(categories);

            if(stakeholder.getDefaultId() == null) {
                if(topicFull.getId() == null) {
                    topicDAO.save(topic);
                    onSaveDefaultTopic(topic, stakeholderId);
                } else {
                    onUpdateDefaultTopic(topic, oldTopic);
                    topicDAO.save(topic);
                }
            } else {
                topicDAO.save(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());
            }
        } 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, Topic oldTopic) {
        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())
                    && (oldTopic.getName() == null || oldTopic.getName().equals(topicBasedOnDefault.getName()))) {

                topicBasedOnDefault.setName(topic.getName());
                topicBasedOnDefault.setAlias(topic.getAlias());
                changed = true;
            }
            if(topic.getDescription() != null && !topic.getDescription().equals(topicBasedOnDefault.getDescription())
                    && (oldTopic.getDescription() == null || oldTopic.getDescription().equals(topicBasedOnDefault.getDescription()))) {

                topicBasedOnDefault.setDescription(topic.getDescription());
                changed = true;
            }
            if(topic.getIcon() != null && !topic.getIcon().equals(topicBasedOnDefault.getIcon())
                    && (oldTopic.getIcon() == null || oldTopic.getIcon().equals(topicBasedOnDefault.getIcon()))) {

                topicBasedOnDefault.setIcon(topic.getIcon());
                changed = true;
            }

            if(!changed) {
                continue;
            }
            topicBasedOnDefault.setUpdateDate(topic.getUpdateDate());
            topicDAO.save(topicBasedOnDefault);
        }
    }*/

    @PreAuthorize("isAuthenticated()")
    @RequestMapping(value = "/{stakeholderId}/{topicId}/delete", method = RequestMethod.DELETE)
    public boolean deleteTopic(@PathVariable("stakeholderId") String stakeholderId,
                               @PathVariable("topicId") String topicId,
                               @RequestParam(required = false) String children) {
        log.debug("delete topic");
        log.debug("Id: " + topicId + " - Stakeholder: " + stakeholderId);
        Stakeholder stakeholder = stakeholderService.findById(stakeholderId);
        Topic topic = this.topicService.findByPath(stakeholder, topicId);
        this.topicService.delete(stakeholder.getType(), topic, true);
        return true;
    }


    /*@PreAuthorize("isAuthenticated()")
    @RequestMapping(value = "/{stakeholderId}/reorder", method = RequestMethod.POST)
    public List<Topic> reorderTopics(@PathVariable("stakeholderId") String stakeholderId,
                                     @RequestBody List<String> topics) {
        log.debug("reorder topics");
        log.debug("Stakeholder: "+stakeholderId);

        Stakeholder stakeholder = stakeholderDAO.findById(stakeholderId);

        if(stakeholder != null) {
            if(!rolesUtils.hasUpdateAuthority(stakeholder.getType(), stakeholder.getAlias())) {
                // EXCEPTION - Access denied
                throw new ForbiddenException("Reorder topics: You are not authorized to update stakeholder with id: "+stakeholderId);
            }

            List<String> oldTopics = stakeholder.getTopics();
            for (String topicId : oldTopics) {
                if (!topics.contains(topicId)) {
                    topics.add(topicId);
                }
            }
            stakeholder.setTopics(topics);

            List<Topic> topicsFull = new ArrayList<>();
            for (String topicId : topics) {
                Topic topic = topicDAO.findById(topicId);
                if(topic == null) {
                    // EXCEPTION - Topic not found
                    throw new EntityNotFoundException("Reorder Topics: Topic with id: " + topicId + " not found");
                }
                topicsFull.add(topic);
            }

            stakeholderDAO.save(stakeholder);
            log.debug("Topics reordered!");

            return topicsFull;
        } else {
            // EXCEPTION - Stakeholder not found
            throw new EntityNotFoundException("Reorder topics: Stakeholder with id: "+stakeholderId+" not found");
        }
    }*/

    @PreAuthorize("isAuthenticated()")
    @RequestMapping(value = "/{stakeholderId}/{topicId}/change-visibility", method = RequestMethod.POST)
    public TopicFull changeTopicVisibility(@PathVariable("stakeholderId") String stakeholderId,
                                           @PathVariable("topicId") String topicId,
                                           @RequestParam("visibility") Visibility visibility, @RequestParam(required = false) Boolean propagate) {
        log.debug("change topic visibility: " + visibility + " - toggle propagate: " + ((propagate != null && propagate) ? "true" : "false"));
        log.debug("Stakeholder: " + stakeholderId + " - Topic: " + topicId);
        Stakeholder stakeholder = this.stakeholderService.findById(stakeholderId);
        return this.topicService.changeVisibility(stakeholder.getType(), stakeholder.getAlias(), topicId, visibility, propagate);
    }
}