/*
 * Copyright 2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.gradle.tooling.internal.provider;

import org.gradle.BuildResult;
import org.gradle.GradleLauncher;
import org.gradle.api.Action;
import org.gradle.api.internal.GradleInternal;
import org.gradle.api.internal.project.ProjectInternal;
import org.gradle.initialization.GradleLauncherAction;
import org.gradle.initialization.ModelConfigurationListener;
import org.gradle.initialization.TasksCompletionListener;
import org.gradle.tooling.internal.protocol.ProjectVersion3;

import java.util.List;

import static java.util.Arrays.asList;

public class BuildModelAction implements GradleLauncherAction<ProjectVersion3> {
    private final BuildsModel builder;
    private final boolean runTasks;
    private ProjectVersion3 model;

    public BuildModelAction(Class<?> type, boolean runTasks) {
        this.runTasks = runTasks;
        List<? extends BuildsModel> modelBuilders = asList(
                new NullResultBuilder(),
                new EclipseModelBuilder(),
                new IdeaModelBuilder(),
                new GradleProjectBuilder(),
                new BasicIdeaModelBuilder(),
                new ProjectOutcomesModelBuilder());

        for (BuildsModel builder : modelBuilders) {
            if (builder.canBuild(type)) {
                this.builder = builder;
                return;
            }
        }

        throw new UnsupportedOperationException(String.format("I don't know how to build a model of type '%s'.", type.getSimpleName()));
    }

    public BuildResult run(GradleLauncher launcher) {

        if (runTasks) {
            launcher.addListener(new TasksCompletionListener() {
                public void onTasksFinished(GradleInternal gradle) {
                    model = builder.buildAll(gradle);
                }
            });
            return launcher.run();
        } else {
            launcher.addListener(new ModelConfigurationListener() {
                public void onConfigure(GradleInternal gradle) {
                    ensureAllProjectsEvaluated(gradle);
                    model = builder.buildAll(gradle);
                }
            });
            return launcher.getBuildAnalysis();
        }
    }

    private void ensureAllProjectsEvaluated(GradleInternal gradle) {
        gradle.getRootProject().allprojects((Action) new Action<ProjectInternal>() {
            public void execute(ProjectInternal projectInternal) {
                projectInternal.evaluate();
            }
        });
    }

    public ProjectVersion3 getResult() {
        return model;
    }
}
