using System;
using System.Collections.Generic;
using System.Linq;
using FsCheck;
using FsCheck.Xunit;
using Seraphina.Core;
using Xunit;

namespace Seraphina.Tests
{
    public class SkillInfoTest
    {
        static readonly List<SkillPoint> validList = new List<SkillPoint> { 1, 2, 3, 4 };

        [Fact]
        public void Ctor_ThrowsOnNullAndEmptyId()
        {
            Assert.Throws<ArgumentNullException>("id", () => new SkillInfo(null, "test", validList));
            Assert.Throws<ArgumentException>("id", () => new SkillInfo("", "test", validList));
        }

        [Fact]
        public void Ctor_ThrowsOnNullAndEmptyName()
        {
            Assert.Throws<ArgumentNullException>("name", () => new SkillInfo("test", null, validList));
            Assert.Throws<ArgumentException>("name", () => new SkillInfo("test", "", validList));
        }

        [Fact]
        public void Ctor_ThrowsOnNullAndEmptySkillCosts()
        {
            Assert.Throws<ArgumentNullException>("skillPointCosts", () => new SkillInfo("test", "test", null));
            Assert.Throws<ArgumentException>("skillPointCosts", () => new SkillInfo("test", "test", new List<SkillPoint> { }));
        }


        [Fact]
        public void Ctor_ThrowsOnNullDescription()
        {
            Assert.Throws<ArgumentNullException>("description", () => new SkillInfo("test", "test", null, validList));
        }

        public static IEnumerable<object[]> GetSkillInvalidLengths()
        {
            for (int i = 1; i < SkillInfo.NumLevelUpgrades; i++)
            {
                yield return new object[] { i };
            }
        }


        [Theory]
        [MemberData(nameof(GetSkillInvalidLengths))]
        public void Ctor_ThrowsWhenSkillCostsTooShort(int length)
        {
            var skillCosts = Enumerable.Range(0, length).Select(x => new SkillPoint(x)).ToList();
            Assert.Throws<ArgumentException>("skillPointCosts", () => new SkillInfo("test", "test", skillCosts));
        }

        [Fact]
        public void Ctor_AcceptsNormalParameters()
        {
            var _ = new SkillInfo("test", "test", validList);
            // Shouldn't do anything special here, just pass.
        }



    }
}