using System;
using NUnit.Framework;
using pflib_net.dice;

namespace pflib_net.Tests;

[TestFixture]
[TestOf(typeof(Dice))]
public class DiceTest
{

    [Test]
    [Repeat(100)]
    public void D20RollProducesValueBetween1And20()
    {
        var die = new Dice(20);
        Assert.That(die.GetValue(), Is.InRange(1, 20));
    }

    [Test]
    [TestCase(10)]
    [TestCase(-10)]
    public void RollAddsValuesCorrectly(int value)
    {
        var die = new Dice(4, add: value);
        Assert.That(die.GetValue(), Is.InRange(1 + value, 4 + value));
    }

    [Test]
    [Repeat(100)]
    public void RollMultipleDiceHasCorrectAmountOfDice()
    {
        var dice = new Dice(4, 20);
        Assert.That(dice.GetValue(), Is.InRange(20, 4 * 20));
    }

    [Test]
    public void KeepHighestHasCorrectNumberOfDice()
    {
        var dice = new Dice(1, 40, 20);
        Assert.That(dice.GetValue(), Is.EqualTo(20));
    }

    [Test]
    public void KeepLowestHasCorrectNumberOfDice()
    {
        var dice = new Dice(1, 40, keepLowest: 20);
        Assert.That(dice.GetValue(), Is.EqualTo(20));
    }

    [Test]
    [TestCase(1, 1)]
    public void CannotSetKeepHighestAndKeepLowest(int high, int low)
    {
        var e = Assert.Throws<InvalidOperationException>(
            () => new Dice(1, 40, high, low));
    }
}