using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using FluentAssertions;
using Light.GuardClauses.Exceptions;
using Xunit;

namespace Light.GuardClauses.Tests.CollectionAssertions;

public static class MustHaveMaximumCountTests
{
    [Theory]
    [InlineData(new[] { 1, 2, 3, 4 }, 3)]
    [InlineData(new[] { 1, 2 }, 1)]
    [InlineData(new[] { 500 }, 0)]
    public static void MoreItems(int[] items, int count)
    {
        Action act = () => items.MustHaveMaximumCount(count, nameof(items));

        var assertion = act.Should().Throw<InvalidCollectionCountException>().Which;
        assertion.Message.Should().Contain($"{nameof(items)} must have at most count {count}, but it actually has count {items.Length}.");
        assertion.ParamName.Should().BeSameAs(nameof(items));
    }

    [Theory]
    [InlineData(new[] { "Foo" }, 1)]
    [InlineData(new[] { "Bar" }, 2)]
    [InlineData(new[] { "Baz", "Qux", "Quux" }, 5)]
    public static void LessOrEqualItems(string[] items, int count) =>
        items.MustHaveMaximumCount(count).Should().BeSameAs(items);

    [Fact]
    public static void CollectionNull()
    {
        Action act = () => ((ObservableCollection<object>) null).MustHaveMaximumCount(42);

        act.Should().Throw<ArgumentNullException>();
    }

    [Theory]
    [InlineData(new[] { 87, 89, 99 }, 1)]
    [InlineData(null, 5)]
    [InlineData(new[] { 1, 2, 3 }, -30)]
    public static void CustomException(int[] collection, int maximumCount) =>
        Test.CustomException(collection,
                             maximumCount,
                             (c, count, exceptionFactory) => c.MustHaveMaximumCount(count, exceptionFactory));

    [Fact]
    public static void NoCustomExceptionThrown()
    {
        var collection = new HashSet<string> { "Foo", "Bar" };
        collection.MustHaveMaximumCount(2, (_, _) => new Exception()).Should().BeSameAs(collection);
    }

    [Fact]
    public static void CustomMessage() =>
        Test.CustomMessage<InvalidCollectionCountException>(message => new List<short> { 1, 2, 3 }.MustHaveMaximumCount(2, message: message));

    [Fact]
    public static void CustomMessageCollectionNull() =>
        Test.CustomMessage<ArgumentNullException>(message => ((ObservableCollection<int>) null).MustHaveMaximumCount(3, message: message));

    [Fact]
    public static void CallerArgumentExpression()
    {
        var myCollection = new List<int> { 1, 2, 3 };

        var act = () => myCollection.MustHaveMaximumCount(2);

        act.Should().Throw<InvalidCollectionCountException>()
           .WithParameterName(nameof(myCollection));
    }
}