pubgrub/src/commonMain/kotlin/version/VersionBorder.kt

package net.cijber.pubgrub.version

import net.cijber.pubgrub.stubs.Version

data class VersionBorder<V : Version<V>>(val version: V, val inclusive: Boolean, val location: Location) :
    Comparable<VersionBorder<V>> {
    enum class Location {
        Top,
        Bottom;
    }

    fun above(otherVersion: V, inside: Boolean = true): Boolean =
        when (otherVersion.compareTo(version)) {
            -1 -> true
            0 -> inside == inclusive
            else -> false
        }

    fun beneath(otherVersion: V, inside: Boolean = true): Boolean =
        when (otherVersion.compareTo(version)) {
            1 -> true
            0 -> inside == inclusive
            else -> false
        }

    override operator fun compareTo(other: VersionBorder<V>): Int {
        val diff = version.compareTo(other.version)

        if (diff == 0) {
            if (other.inclusive == inclusive) {
                return 0
            }

            if (inclusive) {
                if (location == Location.Top) {
                    return 1
                }

                return -1
            }

            if (location == Location.Bottom) {
                return -1
            }

            return 1
        }

        return diff
    }

    override fun equals(other: Any?): Boolean {
        if (this === other) return true
        if (other == null || this::class != other::class) return false

        other as VersionBorder<*>

        if (version != other.version) return false
        if (inclusive != other.inclusive) return false

        return true
    }

    override fun hashCode(): Int {
        var result = version.hashCode()
        result = 31 * result + inclusive.hashCode()
        return result
    }

    fun reversed(): VersionBorder<V> {
        return VersionBorder(version, !inclusive, if (location == Location.Top) Location.Bottom else Location.Top)
    }

    companion object {
        fun <V : Version<V>> top(version: V, inclusive: Boolean = true) =
            VersionBorder(version, inclusive, Location.Top)

        fun <V : Version<V>> bottom(version: V, inclusive: Boolean = true) =
            VersionBorder(version, inclusive, Location.Bottom)
    }
}