/*
 * MIT License
 *
 * Copyright (c) 2019 norangebit
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

package it.norangeb.algorithms.exam

import arrow.core.None
import arrow.core.Option
import arrow.core.Some
import org.amshove.kluent.`should equal`
import org.spekframework.spek2.Spek
import org.spekframework.spek2.style.gherkin.Feature

object DescendentsTest : Spek({
    Feature("descendents") {
        Scenario("get and set") {
            val tree by memoized { DescendentsTree<Int, Int>() }

            When("add couple 15-15, 13-13, 23-23, 5-5") {
                tree[15] = 15
                tree[13] = 13
                tree[23] = 24
                tree[5] = 5
            }

            Then("tree of 23 should equal 24") {
                tree[23] `should equal` Some(24)
            }

            Then("tree of 25 should equal None") {
                tree[25] `should equal` None
            }

            Then("tree of 5 should equal 5") {
                tree[5] `should equal` Some(5)
            }

            When("add couple 1-1, 17-17, 25-25, 23-23") {
                tree[1] = 1
                tree[17] = 17
                tree[25] = 25
                tree[23] = 23
            }

            Then("tree of 23 should equal 23") {
                tree[23] `should equal` Some(23)
            }

            Then("tree of 25 should equal 25") {
                tree[25] `should equal` Some(25)
            }
        }

        Scenario("descendents") {
            val tree by memoized { DescendentsTree<Int, Int>() }

            Given("tree 15, 23, 7, 18, 25, 21, 22, 20") {
                tree[15] = 15
                tree[23] = 23
                tree[7] = 7
                tree[18] = 18
                tree[25] = 25
                tree[21] = 21
                tree[22] = 22
                tree[20] = 20
            }

            lateinit var result: Option<Int>

            When("compute descendents of 21") {
                result = tree.descendents(21)
            }

            Then("result should equal 2") {
                result `should equal` Some(2)
            }

            When("compute descendents of 7") {
                result = tree.descendents(7)
            }

            Then("result should equal 0") {
                result `should equal` Some(0)
            }

            When("compute descendents of 23") {
                result = tree.descendents(23)
            }

            Then("result should equal 5") {
                result `should equal` Some(5)
            }

            When("compute descendents of 8") {
                result = tree.descendents(8)
            }

            Then("result should equal None") {
                result `should equal` None
            }
        }
    }
})