package gr.cite.notification.data;

import gr.cite.notification.common.scope.tenant.TenantScope;
import gr.cite.notification.common.scope.tenant.TenantScoped;
import gr.cite.notification.data.tenant.TenantScopedBaseEntity;
import gr.cite.notification.errorcode.ErrorThesaurusProperties;
import gr.cite.tools.exception.MyForbiddenException;
import jakarta.persistence.EntityManager;
import jakarta.persistence.FlushModeType;
import jakarta.persistence.PersistenceContext;
import org.hibernate.Session;
import org.springframework.stereotype.Service;
import org.springframework.web.context.annotation.RequestScope;

import javax.management.InvalidApplicationException;

@Service
@RequestScope
public class TenantEntityManager {
	@PersistenceContext
	private EntityManager entityManager;
	private final TenantScope tenantScope;
	private final ErrorThesaurusProperties errors;

	public TenantEntityManager(TenantScope tenantScope, ErrorThesaurusProperties errors) {
		this.tenantScope = tenantScope;
		this.errors = errors;
	}


	public void persist(Object entity) {
		this.entityManager.persist(entity);
	}

	public <T> T merge(T entity) throws InvalidApplicationException {
		if (tenantScope.isMultitenant() && (entity instanceof TenantScoped tenantScopedEntity)) {
			if (!tenantScope.isDefaultTenant()) {
				if (tenantScopedEntity.getTenantId() == null || !tenantScopedEntity.getTenantId().equals(tenantScope.getTenant())) throw new MyForbiddenException(this.errors.getTenantTampering().getCode(), this.errors.getTenantTampering().getMessage());
			} else if (tenantScopedEntity.getTenantId() != null) {
				throw new MyForbiddenException(this.errors.getTenantTampering().getCode(), this.errors.getTenantTampering().getMessage());
			}
		}
		return this.entityManager.merge(entity);
	}

	public void remove(Object entity) throws InvalidApplicationException {
		if (tenantScope.isMultitenant() && (entity instanceof TenantScoped tenantScopedEntity)) {
			if (!tenantScope.isDefaultTenant()) {
				if (tenantScopedEntity.getTenantId() == null || !tenantScopedEntity.getTenantId().equals(tenantScope.getTenant())) throw new MyForbiddenException(this.errors.getTenantTampering().getCode(), this.errors.getTenantTampering().getMessage());
			} else if (tenantScopedEntity.getTenantId() != null) {
				throw new MyForbiddenException(this.errors.getTenantTampering().getCode(), this.errors.getTenantTampering().getMessage());
			}
		}
		this.entityManager.remove(entity);
	}

	public <T> T find(Class<T> entityClass, Object primaryKey) throws InvalidApplicationException {
		T entity = this.entityManager.find(entityClass, primaryKey);

		if (tenantScope.isMultitenant() && (entity instanceof TenantScoped tenantScopedEntity)) {
			if (tenantScopedEntity.getTenantId() != null && !tenantScopedEntity.getTenantId().equals(tenantScope.getTenant())) return null;
		}
		return entity;
	}

	public void flush() {
		this.entityManager.flush();
	}


	public void setFlushMode(FlushModeType flushMode) {
		this.entityManager.setFlushMode(flushMode);

	}

	public FlushModeType getFlushMode() {
		return this.entityManager.getFlushMode();
	}

	public void clear() {
		this.entityManager.clear();
	}
	
	public void enableTenantFilters() throws InvalidApplicationException {
		if (!tenantScope.isSet()) return;
		if(!tenantScope.isDefaultTenant()) {
			this.entityManager
					.unwrap(Session.class)
					.enableFilter(TenantScopedBaseEntity.TENANT_FILTER)
					.setParameter(TenantScopedBaseEntity.TENANT_FILTER_TENANT_PARAM, tenantScope.getTenant().toString());
		} else {
			this.entityManager
					.unwrap(Session.class)
					.enableFilter(TenantScopedBaseEntity.DEFAULT_TENANT_FILTER);
		}
	}

	public void disableTenantFilters(){
		this.entityManager
				.unwrap(Session.class)
				.disableFilter(TenantScopedBaseEntity.TENANT_FILTER);

		this.entityManager
				.unwrap(Session.class)
				.disableFilter(TenantScopedBaseEntity.DEFAULT_TENANT_FILTER);
	}
	
	public EntityManager getEntityManager() {
		return entityManager;
	}

	public void setEntityManager(EntityManager entityManager) {
		this.entityManager = entityManager;
	}

}