using NovelSoftware.Application;
using NovelSoftware.Application.Dtos;

namespace NovelSoftware.Tests;

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

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

    [Test]
    public async Task Beats_are_appended_in_order_and_listed_that_way()
    {
        await Beats.CreateAsync(_chapterId, new CreateBeatRequest("She finds the map"));
        await Beats.CreateAsync(_chapterId, new CreateBeatRequest("The harbour burns"));
        await Beats.CreateAsync(_chapterId, new CreateBeatRequest("She boards anyway"));

        var listed = await Beats.ListAsync(_chapterId);

        Assert.Multiple(() =>
        {
            Assert.That(
                listed.Select(b => b.Title),
                Is.EqualTo(new[] { "She finds the map", "The harbour burns", "She boards anyway" }));
            Assert.That(listed.Select(b => b.SortOrder), Is.EqualTo(new[] { 1, 2, 3 }));
        });
    }

    [Test]
    public async Task Reordering_renumbers_to_match_the_order_given()
    {
        var first = await Beats.CreateAsync(_chapterId, new CreateBeatRequest("First"));
        var second = await Beats.CreateAsync(_chapterId, new CreateBeatRequest("Second"));
        var third = await Beats.CreateAsync(_chapterId, new CreateBeatRequest("Third"));

        var reordered = await Beats.ReorderAsync(
            _chapterId, new ReorderBeatsRequest([third.Id, first.Id, second.Id]));

        Assert.That(
            reordered.Select(b => b.Title),
            Is.EqualTo(new[] { "Third", "First", "Second" }));
    }

    [Test]
    public async Task Beats_left_out_of_a_reorder_keep_their_relative_position_at_the_end()
    {
        var first = await Beats.CreateAsync(_chapterId, new CreateBeatRequest("First"));
        await Beats.CreateAsync(_chapterId, new CreateBeatRequest("Second"));
        var third = await Beats.CreateAsync(_chapterId, new CreateBeatRequest("Third"));

        var reordered = await Beats.ReorderAsync(_chapterId, new ReorderBeatsRequest([third.Id, first.Id]));

        Assert.That(
            reordered.Select(b => b.Title),
            Is.EqualTo(new[] { "Third", "First", "Second" }));
    }

    [Test]
    public void Reordering_with_an_unknown_beat_is_refused()
    {
        Beats.CreateAsync(_chapterId, new CreateBeatRequest("First")).Wait();

        Assert.That(
            async () => await Beats.ReorderAsync(_chapterId, new ReorderBeatsRequest([Guid.NewGuid()])),
            Throws.TypeOf<NotFoundException>());
    }

    [Test]
    public async Task A_beat_resolves_its_character_and_scene_names()
    {
        var ines = await Characters.CreateAsync(_projectId, new CreateCharacterRequest("Ines"));
        var scene = await Scenes.CreateAsync(_chapterId, new CreateSceneRequest("The dock at dawn"));

        var beat = await Beats.CreateAsync(_chapterId, new CreateBeatRequest(
            "She burns the atlas",
            CharacterId: ines.Id,
            WhatHappened: "The pages go up faster than she expected.",
            WhatsNext: "Nothing to navigate by but memory.",
            SceneId: scene.Id));

        Assert.Multiple(() =>
        {
            Assert.That(beat.CharacterName, Is.EqualTo("Ines"));
            Assert.That(beat.SceneTitle, Is.EqualTo("The dock at dawn"));
            Assert.That(beat.WhatHappened, Does.Contain("faster than she expected"));
        });
    }

    [Test]
    public async Task A_beat_cannot_borrow_a_character_from_another_project()
    {
        var other = await Projects.CreateAsync(new CreateProjectRequest("Other Book"));
        var stranger = await Characters.CreateAsync(other.Id, new CreateCharacterRequest("Stranger"));

        Assert.That(
            async () => await Beats.CreateAsync(
                _chapterId, new CreateBeatRequest("A beat", CharacterId: stranger.Id)),
            Throws.TypeOf<InvalidOperationException>().With.Message.Contains("same project"));
    }

    [Test]
    public async Task A_beat_cannot_be_grouped_under_a_scene_from_another_chapter()
    {
        var elsewhere = await Chapters.CreateAsync(_projectId, new CreateChapterRequest("Elsewhere"));
        var scene = await Scenes.CreateAsync(elsewhere.Id, new CreateSceneRequest("Another scene"));

        Assert.That(
            async () => await Beats.CreateAsync(
                _chapterId, new CreateBeatRequest("A beat", SceneId: scene.Id)),
            Throws.TypeOf<InvalidOperationException>().With.Message.Contains("same chapter"));
    }

    [Test]
    public async Task Deleting_a_scene_leaves_its_beats_alone()
    {
        var scene = await Scenes.CreateAsync(_chapterId, new CreateSceneRequest("The dock at dawn"));
        var beat = await Beats.CreateAsync(
            _chapterId, new CreateBeatRequest("She burns the atlas", SceneId: scene.Id));

        await Scenes.DeleteAsync(scene.Id);

        // The plan outlives a decision about prose — the beat is simply ungrouped.
        var survivor = await Beats.GetAsync(beat.Id);

        Assert.Multiple(() =>
        {
            Assert.That(survivor.SceneId, Is.Null);
            Assert.That(survivor.Title, Is.EqualTo("She burns the atlas"));
        });
    }

    [Test]
    public async Task Updating_leaves_omitted_fields_alone_and_clears_on_empty_string()
    {
        var beat = await Beats.CreateAsync(_chapterId, new CreateBeatRequest(
            "She finds the map",
            WhatHappened: "Behind the lining of the case.",
            WhatsNext: "She books passage."));

        var renamed = await Beats.UpdateAsync(beat.Id, new UpdateBeatRequest(Title: "She finds it"));

        Assert.Multiple(() =>
        {
            Assert.That(renamed.WhatHappened, Is.EqualTo("Behind the lining of the case."));
            Assert.That(renamed.WhatsNext, Is.EqualTo("She books passage."));
        });

        var cleared = await Beats.UpdateAsync(beat.Id, new UpdateBeatRequest(WhatsNext: ""));

        Assert.Multiple(() =>
        {
            Assert.That(cleared.WhatsNext, Is.Null);
            Assert.That(cleared.WhatHappened, Is.EqualTo("Behind the lining of the case."));
        });
    }
}