using Omika.Core.Contracts.Common;

namespace Omika.Tests.Contracts;

/// <summary>
/// Tests du contrat de pagination : bornes, calcul du nombre total de pages et
/// indicateurs de navigation.
/// </summary>
public class PagedResultTests
{
    [Fact]
    public void PagedRequest_NormalizesPage_ToAtLeastOne()
    {
        var request = new PagedRequest { Page = 0, PageSize = 10 };

        Assert.Equal(1, request.Page);
    }

    [Fact]
    public void PagedRequest_ClampsPageSize()
    {
        var request = new PagedRequest { PageSize = PagedRequest.MaxPageSize + 1 };

        Assert.Equal(PagedRequest.MaxPageSize, request.PageSize);
    }

    [Fact]
    public void PagedRequest_ZeroPageSize_FallsBackToDefault()
    {
        var request = new PagedRequest { PageSize = 0 };

        Assert.Equal(20, request.PageSize);
    }

    [Fact]
    public void PagedResult_ComputesTotalPages_AndNavigation()
    {
        var items = new[] { "a", "b", "c", "d", "e" };
        var result = new PagedResult<string>(items, Page: 1, PageSize: 2, TotalCount: 5, TotalPages: 3);

        Assert.Equal(5, result.TotalCount);
        Assert.Equal(3, result.TotalPages);
        Assert.False(result.HasPreviousPage);
        Assert.True(result.HasNextPage);
    }

    [Fact]
    public void PagedResult_LastPage_HasNoNextPage()
    {
        var result = new PagedResult<string>([], Page: 2, PageSize: 2, TotalCount: 4, TotalPages: 2);

        Assert.True(result.HasPreviousPage);
        Assert.False(result.HasNextPage);
    }
}