using Microsoft.EntityFrameworkCore;
using Novelly.Api.Chapters;
using Novelly.Api.Locations;
using Novelly.Api.Novels;

namespace Novelly.Api.Tests;

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

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

    [Test]
    public async Task Applying_an_unknown_location_by_name_creates_it()
    {
        var chapter = await Chapters.CreateAsync(
            _novelId, new CreateChapterRequest("Landfall", Locations: ["the harbour", "the wreck"]));

        Assert.Multiple(async () =>
        {
            Assert.That(
                chapter!.Locations.Select(l => l.Name),
                Is.EquivalentTo(new[] { "the harbour", "the wreck" }));
            Assert.That(await Locations.ListAsync(_novelId), Has.Count.EqualTo(2));
        });
    }

    [Test]
    public async Task The_same_name_resolves_to_one_location_regardless_of_casing()
    {
        var first = await Chapters.CreateAsync(
            _novelId, new CreateChapterRequest("Landfall", Locations: ["The Harbour"]));
        var second = await Chapters.CreateAsync(
            _novelId, new CreateChapterRequest("Departure", Locations: ["the harbour"]));

        var listed = await Locations.ListAsync(_novelId);

        Assert.Multiple(() =>
        {
            Assert.That(listed, Has.Count.EqualTo(1));
            Assert.That(listed[0].Name, Is.EqualTo("The Harbour"));
            Assert.That(first!.Locations, Has.Count.EqualTo(1));
            Assert.That(second!.Locations[0].Id, Is.EqualTo(first.Locations[0].Id));
        });
    }

    [Test]
    public async Task Supplying_a_location_list_replaces_the_existing_locations()
    {
        var chapter = await Chapters.CreateAsync(
            _novelId, new CreateChapterRequest("Landfall", Locations: ["the harbour", "the wreck"]));

        var updated = (await Chapters.UpdateAsync(
            chapter!.Id, new UpdateChapterRequest(Locations: ["the wreck", "the cliffs"])))!;

        Assert.That(updated.Locations.Select(l => l.Name), Is.EquivalentTo(new[] { "the wreck", "the cliffs" }));
    }

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

        var updated = (await Chapters.UpdateAsync(
            chapter!.Id, new UpdateChapterRequest(Summary: "Ships come in.")))!;

        Assert.Multiple(() =>
        {
            Assert.That(updated.Locations, Has.Count.EqualTo(1));
            Assert.That(updated.Locations[0].Name, Is.EqualTo("the harbour"));
            Assert.That(updated.Summary, Is.EqualTo("Ships come in."));
        });
    }

    [Test]
    public async Task Cross_reference_gathers_every_chapter_at_a_location()
    {
        await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Landfall", Locations: ["the harbour"]));
        await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Unrelated chapter"));

        var locationId = (await Locations.ListAsync(_novelId)).Single().Id;
        var references = (await Locations.GetReferencesAsync(locationId))!;

        Assert.Multiple(() =>
        {
            Assert.That(references.Chapters, Has.Count.EqualTo(1));
            Assert.That(references.Chapters[0].Title, Is.EqualTo("Landfall"));
        });
    }

    [Test]
    public async Task Usage_counts_are_reported()
    {
        await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Landfall", Locations: ["the harbour"]));
        await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Departure", Locations: ["the harbour"]));

        var summary = (await Locations.ListAsync(_novelId)).Single();

        Assert.That(summary.ChapterCount, Is.EqualTo(2));
    }

    [Test]
    public async Task Duplicate_location_names_are_refused_on_create_and_rename()
    {
        await Locations.CreateAsync(_novelId, new CreateLocationRequest("the harbour"));

        Assert.That(
            async () => await Locations.CreateAsync(_novelId, new CreateLocationRequest("The Harbour")),
            Throws.TypeOf<InvalidOperationException>().With.Message.Contains("already has a location"));

        var other = await Locations.CreateAsync(_novelId, new CreateLocationRequest("the wreck"));

        Assert.That(
            async () => await Locations.UpdateAsync(other!.Id, new UpdateLocationRequest(Name: "the harbour")),
            Throws.TypeOf<InvalidOperationException>().With.Message.Contains("already has a location"));
    }

    [Test]
    public async Task Locations_are_scoped_to_their_novel()
    {
        var otherNovel = await Novels.CreateAsync(new CreateNovelRequest("Other Book"));

        await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Landfall", Locations: ["the harbour"]));
        await Chapters.CreateAsync(otherNovel.Id, new CreateChapterRequest("Somewhere", Locations: ["the harbour"]));

        using var verification = Db.CreateContext();

        Assert.Multiple(async () =>
        {
            Assert.That(await Locations.ListAsync(_novelId), Has.Count.EqualTo(1));
            Assert.That(await Locations.ListAsync(otherNovel.Id), Has.Count.EqualTo(1));
            Assert.That(await verification.Locations.CountAsync(), Is.EqualTo(2));
        });
    }

    [Test]
    public async Task Deleting_a_location_leaves_the_chapter_intact()
    {
        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 survivor = (await Chapters.GetAsync(chapter!.Id))!;

        Assert.Multiple(() =>
        {
            Assert.That(survivor.Title, Is.EqualTo("Landfall"));
            Assert.That(survivor.Locations, Is.Empty);
        });
    }

    [Test]
    public async Task Deleting_a_novel_takes_its_locations()
    {
        await Chapters.CreateAsync(_novelId, new CreateChapterRequest("Landfall", Locations: ["the harbour"]));

        await Novels.DeleteAsync(_novelId);

        using var verification = Db.CreateContext();
        Assert.That(await verification.Locations.CountAsync(), Is.EqualTo(0));
    }

    [Test]
    public void A_blank_location_name_is_refused() =>
        Assert.That(
            async () => await Locations.CreateAsync(_novelId, new CreateLocationRequest("   ")),
            Throws.TypeOf<ArgumentException>());
}