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/*
 * Copyright 2017 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.workers.internal;

import com.google.common.base.Objects;
import com.google.common.collect.Sets;

import org.gradle.api.InvalidUserDataException;
import org.gradle.api.Nullable;

import java.io.File;
import java.util.Collections;
import java.util.Set;

public class DaemonForkOptions {
    private final String minHeapSize;
    private final String maxHeapSize;
    private final Iterable jvmArgs;
    private final Iterable classpath;
    private final Iterable sharedPackages;

    public DaemonForkOptions(@Nullable String minHeapSize, @Nullable String maxHeapSize, Iterable jvmArgs) {
        this(minHeapSize, maxHeapSize, jvmArgs, Collections.emptyList(), Collections.emptyList());
    }

    public DaemonForkOptions(@Nullable String minHeapSize, @Nullable String maxHeapSize, Iterable jvmArgs, Iterable classpath,
                             Iterable sharedPackages) {
        this.minHeapSize = minHeapSize;
        this.maxHeapSize = maxHeapSize;
        this.jvmArgs = jvmArgs;
        this.classpath = classpath;
        this.sharedPackages = sharedPackages;
    }

    public String getMinHeapSize() {
        return minHeapSize;
    }

    public String getMaxHeapSize() {
        return maxHeapSize;
    }

    public Iterable getJvmArgs() {
        return jvmArgs;
    }

    public Iterable getClasspath() {
        return classpath;
    }

    public Iterable getSharedPackages() {
        return sharedPackages;
    }

    public boolean isCompatibleWith(DaemonForkOptions other) {
        return getHeapSizeMb(minHeapSize) >= getHeapSizeMb(other.getMinHeapSize())
                && getHeapSizeMb(maxHeapSize) >= getHeapSizeMb(other.getMaxHeapSize())
                && getNormalizedJvmArgs(jvmArgs).containsAll(getNormalizedJvmArgs(other.getJvmArgs()))
                && getNormalizedClasspath(classpath).containsAll(getNormalizedClasspath(other.getClasspath()))
                && getNormalizedSharedPackages(sharedPackages).containsAll(getNormalizedSharedPackages(other.sharedPackages));
    }

    // one way to merge fork options, good for current use case
    public DaemonForkOptions mergeWith(DaemonForkOptions other) {
        String mergedMinHeapSize = mergeHeapSize(minHeapSize, other.minHeapSize);
        String mergedMaxHeapSize = mergeHeapSize(maxHeapSize, other.maxHeapSize);
        Set mergedJvmArgs = getNormalizedJvmArgs(jvmArgs);
        mergedJvmArgs.addAll(getNormalizedJvmArgs(other.getJvmArgs()));
        Set mergedClasspath = getNormalizedClasspath(classpath);
        mergedClasspath.addAll(getNormalizedClasspath(other.classpath));
        Set mergedAllowedPackages = getNormalizedSharedPackages(sharedPackages);
        mergedAllowedPackages.addAll(getNormalizedSharedPackages(other.sharedPackages));
        return new DaemonForkOptions(mergedMinHeapSize, mergedMaxHeapSize, mergedJvmArgs, mergedClasspath, mergedAllowedPackages);
    }

    private int getHeapSizeMb(String heapSize) {
        if (heapSize == null) {
            return -1; // unspecified
        }

        String normalized = heapSize.trim().toLowerCase();
        try {
            if (normalized.endsWith("m")) {
                return Integer.parseInt(normalized.substring(0, normalized.length() - 1));
            }
            if (normalized.endsWith("g")) {
                return Integer.parseInt(normalized.substring(0, normalized.length() - 1)) * 1024;
            }
        } catch (NumberFormatException e) {
            throw new InvalidUserDataException("Cannot parse heap size: " + heapSize, e);
        }
        throw new InvalidUserDataException("Cannot parse heap size: " + heapSize);
    }

    private String mergeHeapSize(String heapSize1, String heapSize2) {
        int mergedHeapSizeMb = Math.max(getHeapSizeMb(heapSize1), getHeapSizeMb(heapSize2));
        return mergedHeapSizeMb == -1 ? null : String.valueOf(mergedHeapSizeMb) + "m";
    }

    private Set getNormalizedJvmArgs(Iterable jvmArgs) {
        Set normalized = Sets.newLinkedHashSet();
        for (String jvmArg : jvmArgs) {
            normalized.add(jvmArg.trim());
        }
        return normalized;
    }

    private Set getNormalizedClasspath(Iterable classpath) {
        return Sets.newLinkedHashSet(classpath);
    }

    private Set getNormalizedSharedPackages(Iterable allowedPackages) {
        return Sets.newLinkedHashSet(allowedPackages);
    }

    public String toString() {
        return Objects.toStringHelper(this).add("minHeapSize", minHeapSize).add("maxHeapSize", maxHeapSize).add("jvmArgs", jvmArgs).add("classpath", classpath).toString();
    }
}