/*
 * Copyright 2014 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.api.internal.artifacts.configurations;

import org.gradle.api.Task;
import org.gradle.api.artifacts.ProjectDependency;
import org.gradle.api.internal.artifacts.dependencies.ProjectDependencyInternal;
import org.gradle.api.internal.project.ProjectState;
import org.gradle.api.internal.project.ProjectStateRegistry;
import org.gradle.api.internal.tasks.TaskDependencyContainerInternal;
import org.gradle.api.internal.tasks.TaskDependencyFactory;
import org.gradle.api.internal.tasks.TaskDependencyResolveContext;
import org.gradle.util.Path;
import org.jspecify.annotations.Nullable;

import java.util.Set;
import java.util.function.Supplier;

class TasksFromProjectDependencies implements TaskDependencyContainerInternal {
    private final TaskDependencyContainerInternal taskDependencyDelegate;

    public TasksFromProjectDependencies(
        String taskName,
        Supplier<Set<ProjectDependency>> projectDependencies,
        TaskDependencyFactory taskDependencyFactory,
        ProjectStateRegistry projectStateRegistry
    ) {
        this.taskDependencyDelegate = taskDependencyFactory.visitingDependencies(
            context -> resolveProjectDependencies(context, projectDependencies.get(), projectStateRegistry, taskName)
        );
    }

    @Override
    public void visitDependencies(TaskDependencyResolveContext context) {
        taskDependencyDelegate.visitDependencies(context);
    }

    private static void resolveProjectDependencies(
        TaskDependencyResolveContext context,
        Set<ProjectDependency> projectDependencies,
        ProjectStateRegistry projectStateRegistry,
        String taskName
    ) {
        for (ProjectDependency projectDependency : projectDependencies) {
            Path identityPath = ((ProjectDependencyInternal) projectDependency).getTargetProjectIdentity().getBuildTreePath();
            ProjectState projectState = projectStateRegistry.stateFor(identityPath);
            projectState.ensureTasksDiscovered();

            Task nextTask = projectState.getMutableModel().getTasks().findByName(taskName);
            if (nextTask != null && context.getTask() != nextTask) {
                context.add(nextTask);
            }
        }
    }

    @Override
    public Set<? extends Task> getDependencies(@Nullable Task task) {
        return taskDependencyDelegate.getDependencies(task);
    }

    @Override
    public Set<? extends Task> getDependenciesForInternalUse(@Nullable Task task) {
        return taskDependencyDelegate.getDependenciesForInternalUse(task);
    }
}
