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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */
package org.elasticsearch.client.tasks;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;

import static java.util.stream.Collectors.groupingBy;
import static java.util.stream.Collectors.toList;

public class ListTasksResponse {

    protected final List taskFailures = new ArrayList<>();
    protected final List nodeFailures = new ArrayList<>();
    protected final List nodesInfoData = new ArrayList<>();
    protected final List tasks = new ArrayList<>();
    protected final List taskGroups = new ArrayList<>();

    ListTasksResponse(List nodesInfoData, List taskFailures, List nodeFailures) {
        if (taskFailures != null) {
            this.taskFailures.addAll(taskFailures);
        }
        if (nodeFailures != null) {
            this.nodeFailures.addAll(nodeFailures);
        }
        if (nodesInfoData != null) {
            this.nodesInfoData.addAll(nodesInfoData);
        }
        this.tasks.addAll(this.nodesInfoData.stream().flatMap(nodeData -> nodeData.getTasks().stream()).collect(toList()));
        this.taskGroups.addAll(buildTaskGroups());
    }

    private List buildTaskGroups() {
        Map taskIdToBuilderMap = new HashMap<>();
        List topLevelTasks = new ArrayList<>();
        // First populate all tasks
        for (TaskInfo taskInfo : this.tasks) {
            taskIdToBuilderMap.put(taskInfo.getTaskId(), TaskGroup.builder(taskInfo));
        }

        // Now go through all task group builders and add children to their parents
        for (TaskGroup.Builder taskGroup : taskIdToBuilderMap.values()) {
            TaskId parentTaskId = taskGroup.getTaskInfo().getParentTaskId();
            if (parentTaskId != null) {
                TaskGroup.Builder parentTask = taskIdToBuilderMap.get(parentTaskId);
                if (parentTask != null) {
                    // we found parent in the list of tasks - add it to the parent list
                    parentTask.addGroup(taskGroup);
                } else {
                    // we got zombie or the parent was filtered out - add it to the top task list
                    topLevelTasks.add(taskGroup);
                }
            } else {
                // top level task - add it to the top task list
                topLevelTasks.add(taskGroup);
            }
        }
        return Collections.unmodifiableList(topLevelTasks.stream().map(TaskGroup.Builder::build).collect(Collectors.toList()));
    }

    public List getTasks() {
        return tasks;
    }

    public Map> getPerNodeTasks() {
        return getTasks().stream().collect(groupingBy(TaskInfo::getNodeId));
    }

    public List getTaskFailures() {
        return taskFailures;
    }

    public List getNodeFailures() {
        return nodeFailures;
    }

    public List getTaskGroups() {
        return taskGroups;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if ((o instanceof ListTasksResponse) == false) return false;
        ListTasksResponse response = (ListTasksResponse) o;
        return nodesInfoData.equals(response.nodesInfoData)
            && Objects.equals(getTaskFailures(), response.getTaskFailures())
            && Objects.equals(getNodeFailures(), response.getNodeFailures())
            && Objects.equals(getTasks(), response.getTasks())
            && Objects.equals(getTaskGroups(), response.getTaskGroups());
    }

    @Override
    public int hashCode() {
        return Objects.hash(nodesInfoData, getTaskFailures(), getNodeFailures(), getTasks(), getTaskGroups());
    }

    @Override
    public String toString() {
        return "CancelTasksResponse{"
            + "nodesInfoData="
            + nodesInfoData
            + ", taskFailures="
            + taskFailures
            + ", nodeFailures="
            + nodeFailures
            + ", tasks="
            + tasks
            + ", taskGroups="
            + taskGroups
            + '}';
    }
}