using Microsoft.EntityFrameworkCore;
using Novelly.Api.Chapters;
using Novelly.Api.Characters;
using Novelly.Api.Common;
using Novelly.Api.Novels;

namespace Novelly.Api.Tests;

[TestFixture]
public class NovelDataTests : ServiceTestFixture
{
    private async Task<Guid> NewNovelAsync() =>
        (await Novels.CreateAsync(new CreateNovelRequest("The Salt Road"))).Id;

    [Test]
    public async Task Updating_leaves_omitted_fields_alone_and_clears_on_empty_string()
    {
        var id = (await Novels.CreateAsync(
            new CreateNovelRequest("Draft", Genre: "Fantasy", Logline: "A cartographer goes to sea."))).Id;

        var afterPartialUpdate = (await Novels.UpdateAsync(id, new UpdateNovelRequest(Title: "The Salt Road")))!;

        Assert.Multiple(() =>
        {
            Assert.That(afterPartialUpdate.Title, Is.EqualTo("The Salt Road"));
            Assert.That(afterPartialUpdate.Genre, Is.EqualTo("Fantasy"));
            Assert.That(afterPartialUpdate.Logline, Is.EqualTo("A cartographer goes to sea."));
        });

        var afterClear = (await Novels.UpdateAsync(id, new UpdateNovelRequest(Genre: "")))!;

        Assert.Multiple(() =>
        {
            Assert.That(afterClear.Genre, Is.Null);
            Assert.That(afterClear.Logline, Is.EqualTo("A cartographer goes to sea."));
        });
    }

    [Test]
    public async Task New_novels_start_in_the_brainstorming_phase_and_can_be_advanced()
    {
        var novel = await Novels.CreateAsync(new CreateNovelRequest("The Salt Road"));
        Assert.That(novel.Phase, Is.EqualTo(NovelPhase.Brainstorming));

        var afterAdvance = (await Novels.UpdateAsync(novel.Id, new UpdateNovelRequest(Phase: NovelPhase.Outlining)))!;
        Assert.That(afterAdvance.Phase, Is.EqualTo(NovelPhase.Outlining));

        var afterUnrelatedUpdate = (await Novels.UpdateAsync(novel.Id, new UpdateNovelRequest(Genre: "Fantasy")))!;
        Assert.That(afterUnrelatedUpdate.Phase, Is.EqualTo(NovelPhase.Outlining));
    }

    [Test]
    public async Task A_novel_response_carries_the_owner_id_and_the_caller_s_role()
    {
        var novel = await Novels.CreateAsync(new CreateNovelRequest("The Salt Road"));
        var response = novel.ToResponse(await Access.GetMyRoleAsync(novel));

        Assert.Multiple(() =>
        {
            Assert.That(response.OwnerId, Is.EqualTo(UserContext.UserId));
            Assert.That(response.MyRole, Is.EqualTo("Admin"));
        });
    }

    [Test]
    public async Task Chapters_are_numbered_in_sequence_when_no_number_is_given()
    {
        var novelId = await NewNovelAsync();

        var first = await Chapters.CreateAsync(novelId, new CreateChapterRequest("Landfall"));
        var second = await Chapters.CreateAsync(novelId, new CreateChapterRequest("The Harbour"));

        Assert.Multiple(() =>
        {
            Assert.That(first.Number, Is.EqualTo(1));
            Assert.That(second.Number, Is.EqualTo(2));
        });
    }

    [Test]
    public async Task Word_count_is_recomputed_whenever_prose_changes()
    {
        var novelId = await NewNovelAsync();

        var chapter = await Chapters.CreateAsync(novelId, new CreateChapterRequest(
            "Landfall", Prose: "Five words go right here"));

        Assert.That(chapter.WordCount, Is.EqualTo(5));

        var rewritten = (await Chapters.UpdateAsync(chapter.Id, new UpdateChapterRequest(
            Prose: "Now\nthere  are   seven words in total")))!;

        Assert.That(rewritten.WordCount, Is.EqualTo(7));

        var cleared = (await Chapters.UpdateAsync(chapter.Id, new UpdateChapterRequest(Prose: "")))!;

        Assert.Multiple(() =>
        {
            Assert.That(cleared.Prose, Is.Null);
            Assert.That(cleared.WordCount, Is.EqualTo(0));
        });
    }

    [Test]
    public async Task Chapter_updates_that_omit_prose_leave_the_draft_untouched()
    {
        var novelId = await NewNovelAsync();
        var chapter = await Chapters.CreateAsync(novelId, new CreateChapterRequest(
            "Landfall", Prose: "The tide came in slow."));

        var updated = (await Chapters.UpdateAsync(chapter.Id, new UpdateChapterRequest(Status: DraftStatus.Revised)))!;

        Assert.Multiple(() =>
        {
            Assert.That(updated.Prose, Is.EqualTo("The tide came in slow."));
            Assert.That(updated.WordCount, Is.EqualTo(5));
            Assert.That(updated.Status, Is.EqualTo(DraftStatus.Revised));
        });
    }

    [Test]
    public async Task Deleting_a_novel_takes_its_characters_and_chapters()
    {
        var novelId = await NewNovelAsync();
        await Characters.CreateAsync(novelId, new CreateCharacterRequest("Ines"));
        await Chapters.CreateAsync(novelId, new CreateChapterRequest("Landfall"));

        await Novels.DeleteAsync(novelId);

        using var verification = Db.CreateContext();

        Assert.Multiple(async () =>
        {
            Assert.That(await verification.Novels.CountAsync(), Is.EqualTo(0));
            Assert.That(await verification.Characters.CountAsync(), Is.EqualTo(0));
            Assert.That(await verification.Chapters.CountAsync(), Is.EqualTo(0));
        });
    }

    [Test]
    public async Task Relating_characters_across_novels_is_refused()
    {
        var firstNovel = await NewNovelAsync();
        var secondNovel = (await Novels.CreateAsync(new CreateNovelRequest("Other Book"))).Id;

        var ines = await Characters.CreateAsync(firstNovel, new CreateCharacterRequest("Ines"));
        var stranger = await Characters.CreateAsync(secondNovel, new CreateCharacterRequest("Stranger"));

        Assert.That(
            async () => await Characters.AddRelationshipAsync(
                ines.Id, new CreateRelationshipRequest(stranger.Id, "sister")),
            Throws.TypeOf<InvalidOperationException>().With.Message.Contains("same novel"));
    }

    [Test]
    public async Task Relationships_resolve_the_other_character_by_name()
    {
        var novelId = await NewNovelAsync();
        var ines = await Characters.CreateAsync(novelId, new CreateCharacterRequest("Ines"));
        var mara = await Characters.CreateAsync(novelId, new CreateCharacterRequest("Mara"));

        var updated = (await Characters.AddRelationshipAsync(
            ines.Id, new CreateRelationshipRequest(mara.Id, "sister", "Estranged since the fire.")))!;

        Assert.Multiple(() =>
        {
            Assert.That(updated.Relationships, Has.Count.EqualTo(1));
            Assert.That(updated.Relationships[0].RelatedCharacter!.Name, Is.EqualTo("Mara"));
        });
    }

    [Test]
    public async Task Reading_a_missing_novel_returns_null_rather_than_throwing() =>
        Assert.That(await Novels.GetAsync(Guid.NewGuid()), Is.Null);
}