using ItWorx.KnowledgeHub.Domain.Knowledge;

namespace ItWorx.KnowledgeHub.Domain.Tests;

public sealed class PageTests
{
    private static readonly DateTimeOffset Now = new(2026, 7, 31, 12, 0, 0, TimeSpan.Zero);

    [Fact]
    public void Create_sets_the_initial_revision_number_and_publishes_immediately()
    {
        var page = Page.Create(
            Guid.NewGuid(),
            null,
            SortKey.First(),
            PageTitle.Create("Voorbeeldpagina"),
            DocumentType.WikiPage,
            "# Hallo",
            Guid.NewGuid(),
            Now);

        Assert.Equal(1, page.CurrentRevisionNumber);
        Assert.Equal(Now, page.PublishedAt);
        Assert.False(page.IsTrashed);
        Assert.Equal("voorbeeldpagina", page.Slug.Value);
    }

    [Fact]
    public void Publish_increments_the_revision_number_and_updates_the_slug()
    {
        var editor = Guid.NewGuid();
        var page = Page.Create(
            Guid.NewGuid(), null, SortKey.First(), PageTitle.Create("Oude titel"),
            DocumentType.WikiPage, "Inhoud", Guid.NewGuid(), Now);

        page.Publish(PageTitle.Create("Nieuwe titel"), "Bijgewerkte inhoud", DocumentType.WikiPage, DocumentStatus.Active, editor, Now.AddMinutes(5));

        Assert.Equal(2, page.CurrentRevisionNumber);
        Assert.Equal("nieuwe-titel", page.Slug.Value);
        Assert.Equal(DocumentStatus.Active, page.DocumentStatus);
        Assert.Equal(editor, page.UpdatedBy);
    }

    [Fact]
    public void MoveTo_rejects_a_page_becoming_its_own_parent()
    {
        var page = Page.Create(
            Guid.NewGuid(), null, SortKey.First(), PageTitle.Create("Pagina"),
            DocumentType.WikiPage, "Inhoud", Guid.NewGuid(), Now);

        Assert.Throws<InvalidOperationException>(
            () => page.MoveTo(page.Id, SortKey.First(), Guid.NewGuid(), Now));
    }

    [Fact]
    public void A_trashed_page_cannot_be_edited_or_moved_until_restored()
    {
        var actor = Guid.NewGuid();
        var page = Page.Create(
            Guid.NewGuid(), null, SortKey.First(), PageTitle.Create("Pagina"),
            DocumentType.WikiPage, "Inhoud", actor, Now);

        page.Trash(actor, Now, TimeSpan.FromDays(30));

        Assert.True(page.IsTrashed);
        Assert.Throws<InvalidOperationException>(
            () => page.Publish(PageTitle.Create("Pagina"), "Nieuw", DocumentType.WikiPage, DocumentStatus.Active, actor, Now));
        Assert.Throws<InvalidOperationException>(
            () => page.MoveTo(null, SortKey.First(), actor, Now));

        page.Restore(actor, Now.AddMinutes(1));
        Assert.False(page.IsTrashed);
    }

    [Fact]
    public void Trashing_twice_is_a_harmless_no_op()
    {
        var actor = Guid.NewGuid();
        var page = Page.Create(
            Guid.NewGuid(), null, SortKey.First(), PageTitle.Create("Pagina"),
            DocumentType.WikiPage, "Inhoud", actor, Now);

        page.Trash(actor, Now, TimeSpan.FromDays(30));
        var purgeAfterFirst = page.PurgeAfter;
        page.Trash(actor, Now.AddDays(1), TimeSpan.FromDays(30));

        Assert.Equal(purgeAfterFirst, page.PurgeAfter);
    }

    [Fact]
    public void ReplaceTags_trims_deduplicates_case_insensitively_and_keeps_first_seen_casing()
    {
        var page = Page.Create(
            Guid.NewGuid(), null, SortKey.First(), PageTitle.Create("Pagina"),
            DocumentType.WikiPage, "Inhoud", Guid.NewGuid(), Now);

        page.ReplaceTags([" Netwerk ", "netwerk", "Archief", "", "  "]);

        Assert.Equal(["Netwerk", "Archief"], page.Tags);
    }

    [Fact]
    public void ReplaceTags_bounds_the_number_of_tags_and_the_length_of_each_tag()
    {
        var page = Page.Create(
            Guid.NewGuid(), null, SortKey.First(), PageTitle.Create("Pagina"),
            DocumentType.WikiPage, "Inhoud", Guid.NewGuid(), Now);

        var tooMany = Enumerable.Range(0, Page.MaxTagCount + 10).Select(i => $"tag{i}");
        page.ReplaceTags(tooMany);
        Assert.Equal(Page.MaxTagCount, page.Tags.Count);

        var tooLong = new string('a', Page.MaxTagLength + 20);
        page.ReplaceTags([tooLong]);
        Assert.Equal(Page.MaxTagLength, page.Tags[0].Length);
    }

    [Fact]
    public void ReplaceTags_does_not_advance_the_revision_number_or_change_UpdatedAt()
    {
        var page = Page.Create(
            Guid.NewGuid(), null, SortKey.First(), PageTitle.Create("Pagina"),
            DocumentType.WikiPage, "Inhoud", Guid.NewGuid(), Now);

        page.ReplaceTags(["Runbook"]);

        Assert.Equal(1, page.CurrentRevisionNumber);
        Assert.Equal(Now, page.UpdatedAt);
    }
}