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/*
 * Copyright 2023 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.initialization;

import org.gradle.api.Task;
import org.gradle.api.artifacts.Configuration;
import org.gradle.api.artifacts.dsl.DependencyHandler;
import org.gradle.api.internal.TaskInternal;
import org.gradle.api.internal.project.ProjectInternal;
import org.gradle.composite.internal.TaskIdentifier;
import org.gradle.internal.build.BuildState;
import org.gradle.internal.classpath.ClassPath;

import java.util.ArrayList;
import java.util.List;

import static org.gradle.api.internal.tasks.TaskDependencyUtil.getDependenciesForInternalUse;

public class DefaultBuildLogicBuilder implements BuildLogicBuilder {
    private final BuildState currentBuild;
    private final ScriptClassPathResolver scriptClassPathResolver;
    private final BuildLogicBuildQueue buildQueue;

    public DefaultBuildLogicBuilder(
        BuildState currentBuild,
        ScriptClassPathResolver scriptClassPathResolver,
        BuildLogicBuildQueue buildQueue
    ) {
        this.currentBuild = currentBuild;
        this.scriptClassPathResolver = scriptClassPathResolver;
        this.buildQueue = buildQueue;
    }

    @Override
    public ScriptClassPathResolutionContext prepareDependencyHandler(DependencyHandler dependencyHandler) {
        return scriptClassPathResolver.prepareDependencyHandler(dependencyHandler);
    }

    @Override
    public void prepareClassPath(Configuration classpathConfiguration, ScriptClassPathResolutionContext resolutionContext) {
        scriptClassPathResolver.prepareClassPath(classpathConfiguration, resolutionContext);
    }

    @Override
    public ClassPath resolveClassPath(Configuration classpathConfiguration, ScriptClassPathResolutionContext resolutionContext) {
        return buildQueue.build(
            currentBuild,
            taskIdentifiersForBuildDependenciesOf(classpathConfiguration),
            () -> scriptClassPathResolver.resolveClassPath(classpathConfiguration, resolutionContext)
        );
    }

    private List taskIdentifiersForBuildDependenciesOf(Configuration classpath) {
        List tasksToBuild = new ArrayList<>();
        for (Task task : getDependenciesForInternalUse(classpath)) {
            BuildState targetBuild = owningBuildOf(task);
            assert targetBuild != currentBuild;
            tasksToBuild.add(TaskIdentifier.of(targetBuild.getBuildIdentifier(), (TaskInternal) task));
        }
        return tasksToBuild;
    }

    private static BuildState owningBuildOf(Task task) {
        return ((ProjectInternal) task.getProject()).getOwner().getOwner();
    }
}