package org.eclipse.wst.common.componentcore.internal;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.ILock;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.xmi.XMIResource;
import org.eclipse.wst.common.componentcore.ModuleCoreNature;
import org.eclipse.wst.common.componentcore.internal.impl.WTPModulesResource;
import org.eclipse.wst.common.internal.emf.resource.TranslatorResource;
import org.eclipse.wst.common.internal.emfworkbench.edit.EMFWorkbenchEditContextFactory;
import org.eclipse.wst.common.project.facet.core.internal.FacetedProjectNature;
import org.eclipse.wst.validation.internal.core.Message;
import org.eclipse.wst.validation.internal.core.ValidationException;
import org.eclipse.wst.validation.internal.provisional.core.IMessage;
import org.eclipse.wst.validation.internal.provisional.core.IReporter;
import org.eclipse.wst.validation.internal.provisional.core.IValidationContext;
import org.eclipse.wst.validation.internal.provisional.core.IValidatorJob;


public class ModuleCoreValidator implements IValidatorJob {
		protected IReporter _reporter;

		public ModuleCoreValidator() {
			super();
			// TODO Auto-generated constructor stub
		}
		
		public Resource getPrimaryResource(IProject project) {
			// see https://bugs.eclipse.org/bugs/show_bug.cgi?id=181334; Changing this method to call ModuleStructuralModel.getPrimaryResource() method instead.
			// This does two things:
			// 1. Reorders the locks to prevent deadlock between locking the resource (Bugzilla 181334),
			//	  then the edit model and
			// 2. Reuses code. (The code between this method and MSM.getPrimaryResource() is identical.
			StructureEdit structureEdit = StructureEdit.getStructureEditForRead(project);
			if (structureEdit != null) {
				ModuleStructuralModel structuralModel = structureEdit.getModuleStructuralModel();
				if (structuralModel != null) {
					// acquiring the ModuleStructuralModel lock here first because the call to getPrimaryResource()
					// will cause this lock to be acquired later resulting in a potential deadlock
					ILock lock = EMFWorkbenchEditContextFactory.getProjectLockObject(structuralModel.getProject());
					try{
						if(null != lock){
							lock.acquire();
						}
						synchronized(structuralModel){
							return structuralModel.getPrimaryResource();
						}
					} finally{
						if(null != lock){
							lock.release();
						}
					}
				}
			}
			return null;
		}

		private ResourceSet getResourceSet(IProject proj) {
			ModuleCoreNature nature = ModuleCoreNature.getModuleCoreNature(proj);
			return nature.getResourceSet();
		}

		public IStatus validateInJob(IValidationContext helper, IReporter reporter)
				throws ValidationException {
			_reporter = reporter;
			//Remove all markers related to this validator
			_reporter.removeAllMessages(this);
			//Using the helper class, load the module model
			IProject proj = (IProject) helper
					.loadModel(ModuleCoreValidatorHelper.MODULECORE, null);
			try {
				if (proj.isAccessible() && proj.hasNature(ModuleCoreNature.MODULE_NATURE_ID)) {
					if (needsMigrating(proj))
						_reporter.addMessage(this, new Message("modulecore",
								IMessage.HIGH_SEVERITY,
								"NEEDSMIGRATING", null, proj));
				}
			} catch (CoreException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			return Status.OK_STATUS;
		}
		public ISchedulingRule getSchedulingRule(IValidationContext helper) {
			return null;
		}

		public void cleanup(IReporter reporter) {
			_reporter = null;

		}
		private boolean needsMigrating(IProject project) throws CoreException {
			XMIResource res = (XMIResource)getPrimaryResource(project);
			boolean multiComps = false;
			if (project==null)
				return false;
			boolean needsMigrating = (!project.hasNature(FacetedProjectNature.NATURE_ID)) || res == null || ((res != null) && ((WTPModulesResource)res).getRootObject() == null); //|| (res!=null && !res.isLoaded() && ((WTPModulesResource)res).getRootObject() != null);
			if (!needsMigrating) {
				if (res instanceof TranslatorResource && ((TranslatorResource)res).getRootObject() instanceof ProjectComponents) {
					ProjectComponents components = (ProjectComponents) ((WTPModulesResource)res).getRootObject();
					if (components.getComponents() != null) {
						multiComps = components.getComponents().size() > 1;
						return multiComps;
					}
				}
			}
			return needsMigrating;
		}

		public void validate(IValidationContext helper, IReporter reporter)
				throws ValidationException {
			// Forwarding to job method
			validateInJob(helper, reporter);
		}
	}