/*****************************************************************************
 * Copyright (c) 2019 CEA LIST.
 * 
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 * 
 * Contributors:
 *  Ansgar Radermacher  ansgar.radermacher@cea.fr
 * 
 *****************************************************************************/

package org.eclipse.papyrus.robotics.ros2.codegen.utils

import java.io.File
import java.util.ArrayList
import java.util.List
import org.eclipse.cdt.core.CCProjectNature
import org.eclipse.cdt.core.model.CoreModel
import org.eclipse.cdt.core.settings.model.CIncludePathEntry
import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry
import org.eclipse.cdt.core.settings.model.ICSettingEntry
import org.eclipse.cdt.managedbuilder.core.ManagedBuildManager
import org.eclipse.cdt.newmake.core.IMakeBuilderInfo
import org.eclipse.core.resources.IProject
import org.eclipse.core.runtime.CoreException
import org.eclipse.core.runtime.NullProgressMonitor
import org.eclipse.emf.common.util.UniqueEList
import org.eclipse.papyrus.designer.languages.common.extensionpoints.LanguageProjectSupport
import org.eclipse.papyrus.designer.languages.cpp.codegen.utils.CppClassUtils
import org.eclipse.papyrus.designer.languages.cpp.profile.C_Cpp.External
import org.eclipse.papyrus.designer.transformation.base.utils.ProjectManagement
import org.eclipse.papyrus.designer.transformation.base.utils.TransformationException
import org.eclipse.papyrus.designer.transformation.core.transformations.TransformationContext
import org.eclipse.papyrus.robotics.ros2.codegen.RosTransformations
import org.eclipse.papyrus.robotics.ros2.codegen.component.CodeSkeleton
import org.eclipse.papyrus.robotics.ros2.codegen.component.RoboticsCppCreator
import org.eclipse.papyrus.robotics.ros2.preferences.Ros2PreferenceUtils
import org.eclipse.papyrus.uml.tools.utils.StereotypeUtil
import org.eclipse.uml2.uml.Class
import org.eclipse.uml2.uml.Package

/** 
 * get or create a CDT project with a given name
 */
class ProjectTools {
	/**
	 * get a CDT project with a given name. If the CDT project does not
	 * exist, it will be created. If the project exists, but is not a C++
	 * CDT project, it will be converted to CDT.
	 * The project will be configured for a colcon build. 
	 */
	static def IProject getProject(String projectName) {
		var genProject = ProjectManagement.getNamedProject(projectName)
		if (genProject !== null && genProject.exists() && genProject.getNature(CCProjectNature.CC_NATURE_ID) === null) {
			// not a CDT project, force conversion into C++
			genProject = null
		}

		if ((genProject === null) || !genProject.exists()) {
			val projectSupport = LanguageProjectSupport.getProjectSupport("C++")
			genProject = projectSupport.createProject(projectName, TransformationContext.current.modelRoot)
			if (genProject !== null && !genProject.exists()) {
				throw new RuntimeException(String.format(
					"project does not exist"
				))
			}
			if (genProject !== null) {
				configureCDT(genProject, projectName.toLowerCase)
			} else {
				throw new TransformationException(RosTransformations.USER_CANEL)
			}
		}
		return genProject
	}

	/**
	 * Basic configuration of a CDT project for colcon
	 */
	static def configureCDT(IProject project, String pkgName) {

		val mngr = CoreModel.getDefault().getProjectDescriptionManager()
		var cdesc = mngr.getProjectDescription(project, true)

		try {
			// loop over all configurations
			for (configDescr : cdesc.getConfigurations()) {

				val main = ManagedBuildManager.getConfigurationForDescription(configDescr)

				main.setBuildCommand("colcon")
				val builder = main.getBuilder()
				builder.setUseDefaultBuildCmd(false)
				builder.setBuildPath("${workspace_loc:}")
				builder.setBuildAttribute(IMakeBuilderInfo.BUILD_TARGET_INCREMENTAL, String.format(
					"build %s %s %s",
					Ros2PreferenceUtils.colconOptions,
					Ros2PreferenceUtils.colconPackageOptions,
					pkgName
				))
				// managedBuild must be set to false, otherwise build path is not taken into account
				// but once set to false, we can't change include directories via the UI - but
				// they are still taken into account
				main.setManagedBuildOn(false)
			}
			mngr.setProjectDescription(project, cdesc, true, null)
			ManagedBuildManager.saveBuildInfo(project, true)
		} catch (CoreException ce) {
			throw new RuntimeException(ce.getMessage())
		}
	}

	/**
	 * Configure the include paths of a CDT project
	 */
	static def configureIncludes(IProject project, List<String> depPkgList) {

		val mngr = CoreModel.getDefault().getProjectDescriptionManager()
		var cdesc = mngr.getProjectDescription(project, true)

		if (cdesc !== null) {
			// cdesc may be null if project setup is incomplete during test
			try {
				// loop over all configurations
				for (configDescr : cdesc.getConfigurations()) {

					val folderDescription = configDescr.getRootFolderDescription()
					val languageSettings = folderDescription.getLanguageSettings()

					val icIncludePaths = new ArrayList<ICLanguageSettingEntry>
					icIncludePaths.add(new CIncludePathEntry("${workspace_loc:/${ProjName}/src-gen}", 0))
					icIncludePaths.add(new CIncludePathEntry("/opt/ros/${ROS_DISTRO}/include", 0))
					for (depPkg : depPkgList) {
						icIncludePaths.add(new CIncludePathEntry(getIncludePath(depPkg), 0))
					}

					// now set include path and preprocessor code
					for (lang : languageSettings) {
						for (String ext : lang.getSourceExtensions()) {
							if (ext.equals("cpp")) {
								lang.setSettingEntries(ICSettingEntry.INCLUDE_PATH, icIncludePaths)
							}
						}
					}
				}
				mngr.setProjectDescription(project, cdesc, true, null)
				ManagedBuildManager.saveBuildInfo(project, true)
			} catch (CoreException ce) {
				throw new RuntimeException(ce.getMessage())
			}
		}
	}

	/**
	 * 
	 */
	static def genCode(IProject project, Class component) {
		val skeleton = component.nearestPackage.getMember(component.name + CodeSkeleton.POSTFIX)
		val codeGen = new RoboticsCppCreator(project, "src-skel/", skeleton);
		val packagesToGenerate = new UniqueEList<Package>();
		packagesToGenerate.add(component.nearestPackage);
		for (incCl : CppClassUtils.includedClassifiers(component)) {
			if (!StereotypeUtil.isApplied(incCl, External)) {
				packagesToGenerate.add(incCl.nearestPackage);
			}
		}
		for (pkg : packagesToGenerate) {
			codeGen.createPackageableElement(pkg, new NullProgressMonitor)
		}
	}

	/**
	 * defaults to workspace path
	 */
	static def getIncludePath(String pkgName) {
		val prefixPath = Ros2PreferenceUtils.standardMessagePath
		for (pathEntry : prefixPath.split(":")) {
			val testPath = '''«pathEntry»/include/«pkgName»'''
			if (new File(testPath).exists()) {
				return testPath
			}
		}
		return '''${WorkspaceDirPath}/install/«pkgName»/include'''
	}
}