src/main/kotlin/de/uapcore/lightpit/util/Issues.kt

/*
 * Copyright 2021 Mike Becker. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package de.uapcore.lightpit.util

import de.uapcore.lightpit.entities.Component
import de.uapcore.lightpit.entities.Issue
import de.uapcore.lightpit.entities.Project
import de.uapcore.lightpit.entities.Version
import de.uapcore.lightpit.types.IssueStatusPhase

data class IssueFilter(
    val project: Filter<Project> = AllFilter(),
    val version: Filter<Version> = AllFilter(),
    val component: Filter<Component> = AllFilter()
)

data class IssueSorter(val criteria: List<Criteria>) : Comparator<Issue> {
    enum class Field {
        DONE, ETA, UPDATED
    }

    data class Criteria(val field: Field, val asc: Boolean = true)

    companion object {
        val DEFAULT_ISSUE_SORTER = IssueSorter(listOf(
            Criteria(Field.DONE),
            Criteria(Field.UPDATED, false),
            Criteria(Field.ETA)
        ))
    }

    override fun compare(left: Issue, right: Issue): Int {
        if (left == right) {
            return 0;
        }
        for (c in criteria) {
            val result = when (c.field) {
                Field.DONE -> (left.status.phase == IssueStatusPhase.Done).compareTo(right.status.phase == IssueStatusPhase.Done)
                Field.ETA -> {
                    val l = left.eta
                    val r = right.eta
                    if (l == null && r == null) 0
                    else if (l == null) 1
                    else if (r == null) -1
                    else l.compareTo(r)
                }
                Field.UPDATED -> left.updated.compareTo(right.updated)
            }
            if (result != 0) {
                return if (c.asc) result else -result
            }
        }
        return 0
    }
}