using Novelly.Api.Chapters;
using Novelly.Api.Characters;
using Novelly.Api.Common;
using Novelly.Api.Projects;
using Novelly.Api.Questions;

namespace Novelly.Api.Tests;

[TestFixture]
public class OpenQuestionTests : ServiceTestFixture
{
    private Guid _projectId;
    private Guid _chapterId;
    private Guid _characterId;

    protected override void OnSetUp()
    {
        _projectId = Projects.CreateAsync(new CreateProjectRequest("The Salt Road")).Result.Id;
        _chapterId = Chapters.CreateAsync(_projectId, new CreateChapterRequest("Landfall")).Result.Id;
        _characterId = Characters.CreateAsync(_projectId, new CreateCharacterRequest("Ines")).Result.Id;
    }

    [Test]
    public async Task A_question_can_hang_off_a_chapter_and_a_character_at_once()
    {
        var question = await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest(
            "Does she know about the letter before the harbour?",
            ChapterId: _chapterId,
            CharacterId: _characterId));

        Assert.Multiple(() =>
        {
            Assert.That(question.Chapter!.Title, Is.EqualTo("Landfall"));
            Assert.That(question.Chapter!.Number, Is.EqualTo(1));
            Assert.That(question.Character!.Name, Is.EqualTo("Ines"));
            Assert.That(question.IsResolved, Is.False);
        });
    }

    [Test]
    public async Task A_question_about_the_book_as_a_whole_needs_no_association()
    {
        var question = await Questions.CreateAsync(
            _projectId, new CreateOpenQuestionRequest("Is this one book or two?"));

        Assert.Multiple(() =>
        {
            Assert.That(question.ChapterId, Is.Null);
            Assert.That(question.CharacterId, Is.Null);
        });
    }

    [Test]
    public async Task The_outline_and_the_character_page_each_see_only_their_own_questions()
    {
        await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest(
            "Where does the chapter break?", ChapterId: _chapterId));
        await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest(
            "What does she actually want?", CharacterId: _characterId));
        await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest("Is this one book or two?"));

        var forChapter = await Questions.ListAsync(_projectId, chapterId: _chapterId);
        var forCharacter = await Questions.ListAsync(_projectId, characterId: _characterId);
        var forProject = await Questions.ListAsync(_projectId);

        Assert.Multiple(() =>
        {
            Assert.That(forChapter.Select(q => q.Question), Is.EqualTo(new[] { "Where does the chapter break?" }));
            Assert.That(forCharacter.Select(q => q.Question), Is.EqualTo(new[] { "What does she actually want?" }));
            Assert.That(forProject, Has.Count.EqualTo(3));
        });
    }

    [Test]
    public async Task Resolved_questions_drop_off_the_list_unless_asked_for()
    {
        var settled = await Questions.CreateAsync(
            _projectId, new CreateOpenQuestionRequest("Where does the chapter break?"));
        await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest("Is this one book or two?"));

        await Questions.ResolveAsync(settled.Id, new ResolveOpenQuestionRequest("After the harbour."));

        var open = await Questions.ListAsync(_projectId);
        var everything = await Questions.ListAsync(_projectId, includeResolved: true);

        Assert.Multiple(() =>
        {
            Assert.That(open.Select(q => q.Question), Is.EqualTo(new[] { "Is this one book or two?" }));
            Assert.That(everything, Has.Count.EqualTo(2));

            // Still-open questions come first, so the list stays about what is undecided.
            Assert.That(everything[0].IsResolved, Is.False);
            Assert.That(everything[1].IsResolved, Is.True);
        });
    }

    [Test]
    public async Task Resolving_records_what_was_decided()
    {
        var question = await Questions.CreateAsync(
            _projectId, new CreateOpenQuestionRequest("Where does the chapter break?"));

        var resolved = (await Questions.ResolveAsync(
            question.Id, new ResolveOpenQuestionRequest("After the harbour burns.")))!;

        Assert.Multiple(() =>
        {
            Assert.That(resolved.IsResolved, Is.True);
            Assert.That(resolved.Resolution, Is.EqualTo("After the harbour burns."));
            Assert.That(resolved.ResolvedAt, Is.Not.Null);
        });
    }

    [Test]
    public async Task A_resolution_can_be_added_as_a_note_on_what_it_was_about()
    {
        await Chapters.UpdateAsync(_chapterId, new UpdateChapterRequest(Notes: "Runs long."));

        var question = await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest(
            "Where does the chapter break?", ChapterId: _chapterId, CharacterId: _characterId));

        await Questions.ResolveAsync(
            question.Id,
            new ResolveOpenQuestionRequest("After the harbour burns.", AppendToNotes: true));

        var chapter = (await Chapters.GetAsync(_chapterId))!;
        var character = (await Characters.GetAsync(_characterId))!;

        Assert.Multiple(() =>
        {
            // The existing note is kept and the decision lands underneath it.
            Assert.That(chapter.Notes, Does.StartWith("Runs long."));
            Assert.That(chapter.Notes, Does.Contain("Where does the chapter break? — After the harbour burns."));
            Assert.That(character.Notes, Is.EqualTo("Where does the chapter break? — After the harbour burns."));
        });
    }

    [Test]
    public async Task A_resolution_stays_off_the_notes_unless_asked_for()
    {
        var question = await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest(
            "Where does the chapter break?", ChapterId: _chapterId));

        await Questions.ResolveAsync(question.Id, new ResolveOpenQuestionRequest("After the harbour."));

        Assert.That((await Chapters.GetAsync(_chapterId))!.Notes, Is.Null);
    }

    [Test]
    public async Task Reopening_clears_the_resolution_but_leaves_the_note_behind()
    {
        var question = await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest(
            "Where does the chapter break?", ChapterId: _chapterId));

        await Questions.ResolveAsync(
            question.Id, new ResolveOpenQuestionRequest("After the harbour.", AppendToNotes: true));

        var reopened = (await Questions.ReopenAsync(question.Id))!;
        var chapter = (await Chapters.GetAsync(_chapterId))!;

        Assert.Multiple(() =>
        {
            Assert.That(reopened.IsResolved, Is.False);
            Assert.That(reopened.Resolution, Is.Null);
            Assert.That(chapter.Notes, Does.Contain("After the harbour."));
        });
    }

    [Test]
    public async Task A_question_can_be_detached_from_what_it_was_about()
    {
        var question = await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest(
            "Where does the chapter break?", ChapterId: _chapterId, CharacterId: _characterId));

        var detached = (await Questions.UpdateAsync(
            question.Id, new UpdateOpenQuestionRequest(ClearChapter: true)))!;

        Assert.Multiple(() =>
        {
            Assert.That(detached.ChapterId, Is.Null);

            // Only the chapter was cleared — a null id means "leave alone", not "detach".
            Assert.That(detached.CharacterId, Is.EqualTo(_characterId));
        });
    }

    [Test]
    public async Task Deleting_a_chapter_leaves_its_questions_open_rather_than_taking_them()
    {
        var question = await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest(
            "Does she know about the letter?", ChapterId: _chapterId));

        await Chapters.DeleteAsync(_chapterId);

        var survivor = (await Questions.GetAsync(question.Id))!;

        Assert.Multiple(() =>
        {
            Assert.That(survivor.ChapterId, Is.Null);
            Assert.That(survivor.Question, Is.EqualTo("Does she know about the letter?"));
        });
    }

    [Test]
    public async Task A_question_can_be_deleted_outright()
    {
        var question = await Questions.CreateAsync(
            _projectId, new CreateOpenQuestionRequest("Where does the chapter break?"));

        await Questions.DeleteAsync(question.Id);

        Assert.Multiple(async () =>
        {
            Assert.That(await Questions.ListAsync(_projectId, includeResolved: true), Is.Empty);
            Assert.That(await Questions.GetAsync(question.Id), Is.Null);
        });
    }

    [Test]
    public async Task Deleting_a_project_takes_its_questions()
    {
        await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest("Is this one book or two?"));

        await Projects.DeleteAsync(_projectId);

        using var verification = Db.CreateContext();
        Assert.That(verification.OpenQuestions.Count(), Is.EqualTo(0));
    }

    [Test]
    public void A_question_cannot_be_attached_to_another_project_s_chapter()
    {
        var elsewhere = Chapters.CreateAsync(
            Projects.CreateAsync(new CreateProjectRequest("Other Book")).Result.Id,
            new CreateChapterRequest("Elsewhere")).Result;

        Assert.That(
            async () => await Questions.CreateAsync(
                _projectId, new CreateOpenQuestionRequest("A question", ChapterId: elsewhere.Id)),
            Throws.TypeOf<InvalidOperationException>().With.Message.Contains("same project"));
    }

    [Test]
    public void A_blank_question_is_refused() =>
        Assert.That(
            async () => await Questions.CreateAsync(_projectId, new CreateOpenQuestionRequest("   ")),
            Throws.TypeOf<ArgumentException>());

    [Test]
    public async Task Resolving_with_nothing_decided_is_refused()
    {
        var question = await Questions.CreateAsync(
            _projectId, new CreateOpenQuestionRequest("Where does the chapter break?"));

        Assert.That(
            async () => await Questions.ResolveAsync(question.Id, new ResolveOpenQuestionRequest("  ")),
            Throws.TypeOf<ArgumentException>());
    }
}