using Microsoft.EntityFrameworkCore;
using Novelly.Api.Beats;
using Novelly.Api.Chapters;
using Novelly.Api.Characters;
using Novelly.Api.Common;
using Novelly.Api.Locations;
using Novelly.Api.Novels;
using Novelly.Api.Trash;
using Novelly.Api.Users;

namespace Novelly.Api.Tests;

[TestFixture]
public class TrashServiceTests : ServiceTestFixture
{
    private Guid _novelId;

    protected override void OnSetUp() =>
        _novelId = Novels.CreateAsync(new CreateNovelRequest("The Salt Road")).Result.Id;

    [Test]
    public async Task Trashing_a_chapter_hides_it_from_the_chapter_list_but_keeps_its_beats()
    {
        var chapter = await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Landfall"));
        await Beats.CreateAsync(chapter!.Id, new CreateBeatRequest("They spot the wreck"));

        await Chapters.DeleteAsync(chapter.Id);

        var listed = await Chapters.ListAsync(_novelId);
        Assert.That(listed, Is.Empty);

        using var verification = Db.CreateContext();
        var survivingBeats = await verification.Beats.IgnoreQueryFilters().Where(b => b.ChapterId == chapter.Id).ToListAsync();
        Assert.That(survivingBeats, Has.Count.EqualTo(1));
    }

    [Test]
    public async Task Restoring_a_chapter_brings_its_beats_back()
    {
        var chapter = await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Landfall"));
        await Beats.CreateAsync(chapter!.Id, new CreateBeatRequest("They spot the wreck"));

        await Chapters.DeleteAsync(chapter.Id);
        var trashedId = (await Trash.ListAsync(_novelId)).Single(i => i.Kind == TrashEntityKind.Chapter).Id;

        var restored = await Trash.RestoreAsync(TrashEntityKind.Chapter, trashedId);
        Assert.That(restored, Is.True);

        var survivor = (await Chapters.GetAsync(chapter.Id))!;
        Assert.That(survivor.Beats.Select(b => b.Title), Is.EquivalentTo(new[] { "They spot the wreck" }));
    }

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

        await Chapters.DeleteAsync(chapter!.Id);
        var afterDelete = await Activity.GetForNovelAsync(_novelId, days: 1);

        var trashedId = (await Trash.ListAsync(_novelId)).Single(i => i.Kind == TrashEntityKind.Chapter).Id;
        await Trash.RestoreAsync(TrashEntityKind.Chapter, trashedId);
        var afterRestore = await Activity.GetForNovelAsync(_novelId, days: 1);

        Assert.Multiple(() =>
        {
            Assert.That(afterDelete.TotalWords, Is.EqualTo(0), "the create and the trash deltas cancel out");
            Assert.That(afterRestore.TotalWords, Is.EqualTo(chapter.WordCount), "restoring adds the word count back");
        });
    }

    [Test]
    public async Task A_trashed_location_name_can_be_used_by_a_new_location()
    {
        var chapter = await Chapters.CreateAsync(
            _novelId, new CreateChapterRequest("Landfall", Locations: ["the harbour"]));
        var locationId = (await Locations.ListAsync(_novelId)).Single().Id;

        await Locations.DeleteAsync(locationId);

        var recreated = await Locations.CreateAsync(_novelId, new CreateLocationRequest("the harbour"));

        Assert.That(recreated, Is.Not.Null);
        Assert.That(chapter, Is.Not.Null);
    }

    [Test]
    public async Task Restoring_a_location_whose_name_was_taken_reports_a_clash()
    {
        var locationId = (await Locations.CreateAsync(_novelId, new CreateLocationRequest("the harbour")))!.Id;
        await Locations.DeleteAsync(locationId);
        await Locations.CreateAsync(_novelId, new CreateLocationRequest("the harbour"));

        var trashedId = (await Trash.ListAsync(_novelId)).Single(i => i.Kind == TrashEntityKind.Location).Id;

        Assert.That(
            () => Trash.RestoreAsync(TrashEntityKind.Location, trashedId),
            Throws.TypeOf<InvalidOperationException>().With.Message.Contains("already has a location"));
    }

    [Test]
    public async Task Trashed_characters_disappear_from_beat_listings()
    {
        var chapter = await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Landfall"));
        var character = await Characters.CreateAsync(_novelId, new CreateCharacterRequest("Kael"));
        var beat = await Beats.CreateAsync(
            chapter!.Id, new CreateBeatRequest("Kael spots the wreck", CharacterIds: [character!.Id]));

        await Characters.DeleteAsync(character.Id);

        var survivor = (await Beats.GetAsync(beat!.Id))!;
        Assert.That(survivor.ToResponse().Characters, Is.Empty);
    }

    [Test]
    public async Task Restoring_a_trashed_character_brings_it_back()
    {
        var character = await Characters.CreateAsync(_novelId, new CreateCharacterRequest("Kael"));
        await Characters.DeleteAsync(character!.Id);
        var trashedId = (await Trash.ListAsync(_novelId)).Single(i => i.Kind == TrashEntityKind.Character).Id;

        var restored = await Trash.RestoreAsync(TrashEntityKind.Character, trashedId);

        Assert.Multiple(async () =>
        {
            Assert.That(restored, Is.True);
            Assert.That(await Characters.GetAsync(character.Id), Is.Not.Null);
            Assert.That(await Trash.ListAsync(_novelId), Is.Empty);
        });
    }

    [Test]
    public async Task Emptying_trash_purges_everything_in_the_novel_but_leaves_other_novels_alone()
    {
        var otherNovelId = (await Novels.CreateAsync(new CreateNovelRequest("Elsewhere"))).Id;
        var elsewhereChapter = await Chapters.CreateAsync(otherNovelId, new CreateChapterRequest("A Different Book"));
        await Chapters.DeleteAsync(elsewhereChapter!.Id);

        var chapter = await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Landfall"));
        var character = await Characters.CreateAsync(_novelId, new CreateCharacterRequest("Kael"));
        await Chapters.DeleteAsync(chapter!.Id);
        await Characters.DeleteAsync(character!.Id);

        var purged = await Trash.EmptyAsync(_novelId);

        Assert.Multiple(async () =>
        {
            Assert.That(purged, Is.EqualTo(2));
            Assert.That(await Trash.ListAsync(_novelId), Is.Empty);
            Assert.That((await Trash.ListAsync(otherNovelId)).Select(i => i.Id), Is.EquivalentTo(new[] { elsewhereChapter.Id }));
        });

        using var verification = Db.CreateContext();
        Assert.Multiple(async () =>
        {
            Assert.That(await verification.Chapters.IgnoreQueryFilters().AnyAsync(c => c.Id == chapter.Id), Is.False);
            Assert.That(await verification.Characters.IgnoreQueryFilters().AnyAsync(c => c.Id == character.Id), Is.False);
        });
    }

    [Test]
    public async Task Purging_a_character_that_others_relate_to_succeeds()
    {
        var kael = await Characters.CreateAsync(_novelId, new CreateCharacterRequest("Kael"));
        var mira = await Characters.CreateAsync(_novelId, new CreateCharacterRequest("Mira"));
        await Characters.AddRelationshipAsync(mira!.Id, new CreateRelationshipRequest(kael!.Id, "sibling"));

        await Characters.DeleteAsync(kael.Id);
        var trashedId = (await Trash.ListAsync(_novelId)).Single(i => i.Kind == TrashEntityKind.Character).Id;

        var purged = await Trash.PurgeAsync(TrashEntityKind.Character, trashedId);
        Assert.That(purged, Is.True);

        using var verification = Db.CreateContext();
        Assert.That(await verification.Characters.IgnoreQueryFilters().AnyAsync(c => c.Id == kael.Id), Is.False);
    }

    [Test]
    public async Task Purging_a_chapter_deletes_its_beats_for_good()
    {
        var chapter = await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Landfall"));
        await Beats.CreateAsync(chapter!.Id, new CreateBeatRequest("They spot the wreck"));

        await Chapters.DeleteAsync(chapter.Id);
        var trashedId = (await Trash.ListAsync(_novelId)).Single(i => i.Kind == TrashEntityKind.Chapter).Id;

        await Trash.PurgeAsync(TrashEntityKind.Chapter, trashedId);

        using var verification = Db.CreateContext();
        Assert.That(await verification.Beats.IgnoreQueryFilters().AnyAsync(b => b.ChapterId == chapter.Id), Is.False);
    }

    [Test]
    public async Task An_editor_cannot_restore_or_purge()
    {
        var chapter = await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Landfall"));
        await Chapters.DeleteAsync(chapter!.Id);
        var trashedId = (await Trash.ListAsync(_novelId)).Single().Id;

        var editorId = AsNewUser(GlobalRole.Reviewer);
        GrantNovelRole(_novelId, editorId, NovelRole.Editor);

        Assert.Multiple(() =>
        {
            Assert.That(() => Trash.RestoreAsync(TrashEntityKind.Chapter, trashedId), Throws.TypeOf<NotAuthorizedException>());
            Assert.That(() => Trash.PurgeAsync(TrashEntityKind.Chapter, trashedId), Throws.TypeOf<NotAuthorizedException>());
        });
    }

    [Test]
    public async Task Trash_lists_only_the_novels_own_items()
    {
        var otherNovelId = (await Novels.CreateAsync(new CreateNovelRequest("Elsewhere"))).Id;
        var otherChapter = await Chapters.CreateAsync(otherNovelId, new CreateChapterRequest("A Different Book"));
        await Chapters.DeleteAsync(otherChapter!.Id);

        var chapter = await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Landfall"));
        await Chapters.DeleteAsync(chapter!.Id);

        var listed = await Trash.ListAsync(_novelId);

        Assert.That(listed.Select(i => i.Id), Is.EquivalentTo(new[] { chapter.Id }));
    }

    private Guid AsNewUser(GlobalRole globalRole)
    {
        var user = new NovellyUser
        {
            Id = Guid.NewGuid(),
            UserName = $"{Guid.NewGuid()}@novelly.test",
            Email = $"{Guid.NewGuid()}@novelly.test",
            DisplayName = "Test User",
            GlobalRole = globalRole
        };
        Db.Context.Users.Add(user);
        Db.Context.SaveChanges();

        UserContext.UserId = user.Id;
        UserContext.GlobalRole = globalRole;
        return user.Id;
    }

    private void GrantNovelRole(Guid novelId, Guid userId, NovelRole role)
    {
        Db.Context.NovelMembers.Add(new NovelMember { NovelId = novelId, UserId = userId, NovelRole = role, GrantedByUserId = userId });
        Db.Context.SaveChanges();
    }
}