package eu.dnetlib.uoamonitorservice.controllers;

import eu.dnetlib.uoamonitorservice.dto.CategoryFull;
import eu.dnetlib.uoamonitorservice.entities.Category;
import eu.dnetlib.uoamonitorservice.entities.Stakeholder;
import eu.dnetlib.uoamonitorservice.entities.Topic;
import eu.dnetlib.uoamonitorservice.primitives.Visibility;
import eu.dnetlib.uoamonitorservice.service.CategoryService;
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 CategoryController {
    private final Logger log = LogManager.getLogger(this.getClass());

    private final StakeholderService stakeholderService;
    private final TopicService topicService;
    private final CategoryService categoryService;

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

    /*@PreAuthorize("isAuthenticated()")
    @RequestMapping(value = "/{stakeholderId}/{topicId}/save", method = RequestMethod.POST)
    public Category<SubCategory> saveCategory(@PathVariable("stakeholderId") String stakeholderId,
                                              @PathVariable("topicId") String topicId,
                                              @RequestBody Category<SubCategory> categoryFull) {
        log.debug("save category");
        log.debug("Alias: " + categoryFull.getAlias() + " - Id: " + categoryFull.getId() + " - Stakeholder: " + stakeholderId + " - Topic: " + topicId);

        Stakeholder stakeholder = stakeholderDAO.findById(stakeholderId);

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

            Category<String> oldCategory = null;
            if (categoryFull.getId() != null) {
                oldCategory = categoryDAO.findById(categoryFull.getId());
                if (oldCategory == null) {
                    // EXCEPTION - Category not found
                    throw new EntityNotFoundException("save category: Category with id: " + categoryFull.getId() + " not found");
                }
            }

            Topic<String> topic = topicDAO.findById(topicId);
            if (topic != null) {
                if (stakeholder.getTopics().contains(topicId)) {
                    Category<String> category = new Category<>(categoryFull);

                    Date date = new Date();
                    category.setUpdateDate(date);
                    categoryFull.setUpdateDate(date);

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

                    // if category not exists (no id), create a new default subcategory, identical to category
                    if (categoryFull.getId() == null) {
                        category.setCreationDate(date);
                        categoryFull.setCreationDate(date);

                        SubCategory<String> subCategory = new SubCategory<>();
                        subCategory.createOverviewSubCategory(categoryFull);

                        subCategoryDAO.save(subCategory);

                        List<SubCategory> subCategoriesFull = categoryFull.getSubCategories();
                        subCategoriesFull.add(subCategory);

                        for (SubCategory oldSubCategory : subCategoriesFull) {
                            subCategories.add(oldSubCategory.getId());
                        }
                    } else {
                        for (String subCategoryId : oldCategory.getSubCategories()) {
                            SubCategory subCategory = subCategoryDAO.findById(subCategoryId);
                            if (subCategory == null) {
                                // EXCEPTION - SubCategory not found
                                throw new EntityNotFoundException("Save category: SubCategory with id: " + subCategoryId + " not found (subcategory exists in category: " + category.getId() + ")");
                            }
                            subCategories.add(subCategory.getId());
                        }
                    }

                    category.setSubCategories(subCategories);

                    if (stakeholder.getDefaultId() == null) {
                        if (categoryFull.getId() == null) {
                            categoryDAO.save(category);
                            onSaveDefaultCategory(category, topicId);
                        } else {
                            onUpdateDefaultCategory(category, oldCategory);
                            categoryDAO.save(category);
                        }
                    } else {
                        categoryDAO.save(category);
                    }

                    List<String> categories = topic.getCategories();
                    int index = categories.indexOf(category.getId());
                    if (index == -1) {
                        categories.add(category.getId());
                        topicDAO.save(topic);
                        log.debug("Category saved!");

                        categoryFull.setId(category.getId());
                    }
                } else {
                    // EXCEPTION - Topic not found in Stakeholder: stakeholder.getAlias();
                    throw new PathNotValidException("Save category: Topic with id: " + topicId + " not found in Stakeholder: " + stakeholderId);
                }
            } else {
                // EXCEPTION - Topic not found
                throw new EntityNotFoundException("Save category: Topic with id: " + topicId + " not found");
            }
        } else {
            // EXCEPTION - Stakeholder not found
            throw new EntityNotFoundException("Save category: Stakeholder with id: " + stakeholderId + " not found");
        }
        return categoryFull;
    }*/

    /*public void onSaveDefaultCategory(Category<String> category, String topicId) {
        log.debug("On save default category");

        List<Topic> topics = topicDAO.findByDefaultId(topicId);
        for (Topic topic : topics) {
            Category categoryNew = new Category();
            categoryNew.copyFromDefault(category);

            categoryDAO.save(categoryNew);

            List<String> categories = topic.getCategories();
            categories.add(categoryNew.getId());

            topicDAO.save(topic);
        }
        String subCategoryOverviewId = category.getSubCategories().get(0);
        SubCategory subCategoryOverview = subCategoryDAO.findById(subCategoryOverviewId);
        subCategoryController.onSaveDefaultSubCategory(subCategoryOverview, category.getId());
    }*/

    /*public void onUpdateDefaultCategory(Category category, Category oldCategory) {
        log.debug("On update default category");

        List<Category> categories = categoryDAO.findByDefaultId(category.getId());
        boolean changed = false;
        for (Category categoryBasedOnDefault : categories) {
            if (category.getName() != null && !category.getName().equals(categoryBasedOnDefault.getName())
                    && (oldCategory.getName() == null || oldCategory.getName().equals(categoryBasedOnDefault.getName()))) {

                categoryBasedOnDefault.setName(category.getName());
                categoryBasedOnDefault.setAlias(category.getAlias());
                changed = true;
            }
            if (category.getDescription() != null && !category.getDescription().equals(categoryBasedOnDefault.getDescription())
                    && (oldCategory.getDescription() == null || oldCategory.getDescription().equals(categoryBasedOnDefault.getDescription()))) {

                categoryBasedOnDefault.setDescription(category.getDescription());
                changed = true;
            }

            if (!changed) {
                continue;
            }
            categoryBasedOnDefault.setUpdateDate(category.getUpdateDate());
            categoryDAO.save(categoryBasedOnDefault);
        }
    }*/

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

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

        Topic<String> topic = checkForExceptions(stakeholderId, topicId);

        List<String> oldCategories = topic.getCategories();
        for (String categoryId : oldCategories) {
            if (!categories.contains(categoryId)) {
                categories.add(categoryId);
            }
        }
        topic.setCategories(categories);

        List<Category> categoriesFull = new ArrayList<>();
        for (String categoryId : categories) {
            Category category = categoryDAO.findById(categoryId);
            if (category == null) {
                // EXCEPTION - Category not found
                throw new EntityNotFoundException("Reorder Categories: Category with id: " + categoryId + " not found");
            }
            categoriesFull.add(category);
        }

        topicDAO.save(topic);
        log.debug("Categories reordered!");

        return categoriesFull;
    }*/

    @PreAuthorize("isAuthenticated()")
    @RequestMapping(value = "/{stakeholderId}/{topicId}/{categoryId}/change-visibility", method = RequestMethod.POST)
    public CategoryFull changeCategoryVisibility(@PathVariable("stakeholderId") String stakeholderId,
                                                 @PathVariable("topicId") String topicId,
                                                 @PathVariable("categoryId") String categoryId,
                                                 @RequestParam("visibility") Visibility visibility, @RequestParam(defaultValue = "false") Boolean propagate) {
        log.debug("change category visibility: " + visibility + " - toggle propagate: " + propagate);
        log.debug("Stakeholder: " + stakeholderId + " - Topic: " + topicId + " - Category: " + categoryId);
        Stakeholder stakeholder = this.stakeholderService.findById(stakeholderId);
        Topic topic = this.topicService.findByPath(stakeholder, topicId);
        Category category = this.categoryService.findByPath(topic, categoryId);
        return  this.categoryService.changeVisibility(stakeholder.getType(), stakeholder.getAlias(), category, visibility, propagate);
    }
}