package eu.dnetlib.uoamonitorservice.service;

import eu.dnetlib.uoaadmintoolslibrary.handlers.ForbiddenException;
import eu.dnetlib.uoamonitorservice.dao.*;
import eu.dnetlib.uoamonitorservice.entities.Indicator;
import eu.dnetlib.uoamonitorservice.entities.Section;
import eu.dnetlib.uoamonitorservice.entities.Stakeholder;
import eu.dnetlib.uoamonitorservice.entities.SubCategory;
import eu.dnetlib.uoamonitorservice.handlers.EntityNotFoundException;
import eu.dnetlib.uoamonitorservice.handlers.PathNotValidException;
import eu.dnetlib.uoamonitorservice.primitives.Visibility;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Date;
import java.util.List;

@Service
public class IndicatorService {
    private final StakeholderDAO stakeholderDAO;
    private final TopicDAO topicDAO;
    private final CategoryDAO categoryDAO;
    private final SubCategoryDAO subCategoryDAO;
    private final SectionDAO sectionDAO;
    private final IndicatorDAO dao;

    private final CommonService commonService;

    @Autowired
    public IndicatorService(StakeholderDAO stakeholderDAO, TopicDAO topicDAO, CategoryDAO categoryDAO,SubCategoryDAO subCategoryDAO,
                            SectionDAO sectionDAO, IndicatorDAO dao, CommonService commonService) {
        this.stakeholderDAO = stakeholderDAO;
        this.topicDAO = topicDAO;
        this.categoryDAO = categoryDAO;
        this.subCategoryDAO = subCategoryDAO;
        this.sectionDAO = sectionDAO;
        this.dao = dao;
        this.commonService = commonService;
    }

    public Indicator find(String id) {
        return dao.findById(id).orElseThrow(() -> new EntityNotFoundException("Indicator with id: " + id + " not found"));
    }

    public Indicator findByPath(Section section, String indicatorId) {
        if (!section.getIndicators().contains(indicatorId)) {
            throw new PathNotValidException("Indicator with id: " + indicatorId + " not found in Section: " + section.getId());
        }
        return this.dao.findById(indicatorId).orElseThrow(() -> new EntityNotFoundException("Indicator with id: " + indicatorId + " not found"));
    }

    public Indicator getIndicator(String type, String alias, String id) {
        Indicator indicator = this.find(id);
        if(this.commonService.hasVisibilityAuthority(type, alias, indicator)) {
            return indicator;
        } else {
            return null;
        }
    }

    public String build(String id) {
        return this.save(this.find(id).copy()).getId();
    }

    public String copy(String id) {
        Indicator copy = new Indicator(this.find(id));
        copy.setId(null);
        return this.save(copy).getId();
    }

    public Indicator save(Indicator indicator) {
        if(indicator.getId() == null) {
            indicator.setCreationDate(new Date());
        }
        indicator.setUpdateDate(new Date());
        return this.dao.save(indicator);
    }

    public Indicator save(Stakeholder stakeholder, Section section, Indicator indicator) {
        if(indicator.getId() != null) {
            if (this.commonService.hasEditAuthority(stakeholder.getType(), stakeholder.getAlias())) {
                this.updateChildren(indicator);
                indicator = this.save(indicator);
            } else {
                throw new ForbiddenException("You are not authorized to update stakeholder with id: " + stakeholder.getId());
            }
        } else {
            if (this.commonService.hasCreateAuthority(stakeholder.getType())) {
                indicator = this.save(indicator);
                this.createChildren(section, indicator);
                this.addIndicator(section, indicator.getId());
            } else {
                throw new ForbiddenException("You are not authorized to create an indicator in stakeholder with id: " + stakeholder.getId());
            }
        }
        return indicator;
    }

    public void createChildren(Section defaultSection, Indicator indicator) {
        this.sectionDAO.findByDefaultId(defaultSection.getId()).forEach(section -> {
            List<SubCategory> subCategories = this.subCategoryDAO.findByNumbersContaining(section.getId());
            subCategories.addAll(this.subCategoryDAO.findByChartsContaining(section.getId()));
            subCategories.forEach(subCategory -> {
                this.categoryDAO.findBySubCategoriesContaining(subCategory.getId()).forEach(category -> {
                    this.topicDAO.findByCategoriesContaining(category.getId()).forEach(topic -> {
                        this.stakeholderDAO.findByTopicsContaining(topic.getId()).forEach(stakeholder -> {
                            this.save(stakeholder, section, indicator.copy());
                        });
                    });
                });
            });
        });
    }

    public void updateChildren(Indicator indicator) {
        this.dao.findByDefaultId(indicator.getId()).forEach(child -> {
            this.save(indicator.override(child, this.find(indicator.getId())));
        });
    }

    public void delete(String type, Indicator indicator, boolean remove) {
        if(this.commonService.hasDeleteAuthority(type)) {
            this.dao.findByDefaultId(indicator.getId()).forEach(child -> {
                this.delete(type, child.getId(), remove);
            });
            if(remove) {
                this.removeIndicator(indicator.getId());
            }
            this.dao.delete(indicator);
        } else {
            throw new ForbiddenException("Delete indicator: You are not authorized to delete indicator with id: " + indicator.getId());
        }
    }


    public void delete(String type, String id, boolean remove) {
        Indicator indicator = this.find(id);
        this.delete(type, indicator, remove);
    }

    public void addIndicator(Section section, String id) {
        section.addIndicator(id);
        section.setUpdateDate(new Date());
        this.sectionDAO.save(section);
    }

    public void removeIndicator(String id) {
        this.sectionDAO.findByIndicatorsContaining(id).forEach(section ->  {
            section.removeIndicator(id);
            section.setUpdateDate(new Date());
            this.sectionDAO.save(section);
        });
    }

    public Indicator changeVisibility(String type, String alias, Indicator indicator, Visibility visibility) {
        if(this.commonService.hasEditAuthority(type, alias)) {
            indicator.setVisibility(visibility);
            return this.save(indicator);
        } else {
            throw new ForbiddenException("Change section visibility: You are not authorized to update section with id: " + indicator.getId());
        }
    }
}