using Microsoft.EntityFrameworkCore;
using Novelly.Api.Activity;
using Novelly.Api.Beats;
using Novelly.Api.Chapters;
using Novelly.Api.Novels;
using Novelly.Api.Users;

namespace Novelly.Api.Tests;

[TestFixture]
public class ActivityTests : ServiceTestFixture
{
    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;
    }

    [Test]
    public async Task Writing_prose_records_the_word_delta_for_that_day()
    {
        var novel = await Novels.CreateAsync(new CreateNovelRequest("The Salt Road"));
        var chapter = await Chapters.CreateAsync(novel.Id, new CreateChapterRequest("Landfall"));

        await Chapters.UpdateAsync(chapter!.Id, new UpdateChapterRequest(Prose: "one two three four five"));

        var calendar = await Activity.GetForNovelAsync(novel.Id, days: 7);

        Assert.That(calendar.Days.Sum(d => d.Words), Is.EqualTo(5));
    }

    [Test]
    public async Task Editing_a_beat_records_one_edit_not_two()
    {
        var novel = await Novels.CreateAsync(new CreateNovelRequest("The Salt Road"));
        var chapter = await Chapters.CreateAsync(novel.Id, new CreateChapterRequest("Landfall"));
        var beat = await Beats.CreateAsync(chapter!.Id, new CreateBeatRequest("She finds the map"));

        await Beats.UpdateAsync(beat!.Id, new UpdateBeatRequest(WhatHappened: "She finds the map under the floorboards."));

        var beatEvents = await Db.Context.ActivityEvents.CountAsync(e => e.EntityKind == ActivityEntityKind.Beat);
        var chapterEvents = await Db.Context.ActivityEvents.CountAsync(e => e.EntityKind == ActivityEntityKind.Chapter);

        Assert.Multiple(() =>
        {
            Assert.That(beatEvents, Is.EqualTo(2));
            Assert.That(chapterEvents, Is.EqualTo(1));
        });
    }

    [Test]
    public async Task Deleting_a_chapter_records_a_negative_word_delta()
    {
        var novel = await Novels.CreateAsync(new CreateNovelRequest("The Salt Road"));
        var chapter = await Chapters.CreateAsync(novel.Id, new CreateChapterRequest("Landfall", Prose: "one two three"));

        await Chapters.DeleteAsync(chapter!.Id);

        var calendar = await Activity.GetForNovelAsync(novel.Id, days: 7);

        Assert.That(calendar.Days.Sum(d => d.Words), Is.EqualTo(0));
    }

    [Test]
    public async Task The_calendar_groups_multiple_edits_into_one_day()
    {
        var novel = await Novels.CreateAsync(new CreateNovelRequest("The Salt Road"));
        var chapter = await Chapters.CreateAsync(novel.Id, new CreateChapterRequest("Landfall"));

        await Chapters.UpdateAsync(chapter!.Id, new UpdateChapterRequest(Summary: "First pass"));
        await Chapters.UpdateAsync(chapter.Id, new UpdateChapterRequest(Summary: "Second pass"));

        var calendar = await Activity.GetForNovelAsync(novel.Id, days: 7);

        Assert.Multiple(() =>
        {
            Assert.That(calendar.Days, Has.Count.EqualTo(1));
            Assert.That(calendar.Days[0].Edits, Is.EqualTo(4));
        });
    }

    [Test]
    public async Task The_calendar_omits_days_with_no_activity()
    {
        var novel = await Novels.CreateAsync(new CreateNovelRequest("The Salt Road"));

        var calendar = await Activity.GetForNovelAsync(novel.Id, days: 7);

        Assert.That(calendar.Days, Has.Count.EqualTo(1));
    }

    [Test]
    public async Task The_calendar_excludes_novels_the_user_cannot_read()
    {
        var novel = await Novels.CreateAsync(new CreateNovelRequest("Someone Else's Novel"));

        AsNewUser(GlobalRole.Writer);
        await Novels.CreateAsync(new CreateNovelRequest("My Own Novel"));

        var calendar = await Activity.GetForCurrentUserAsync(days: 7);

        Assert.That(calendar.TotalEdits, Is.EqualTo(1));
    }

    [Test]
    public async Task Deleting_a_novel_removes_its_activity_events()
    {
        var novel = await Novels.CreateAsync(new CreateNovelRequest("The Salt Road"));
        await Chapters.CreateAsync(novel.Id, new CreateChapterRequest("Landfall"));

        await Novels.DeleteAsync(novel.Id);

        Assert.That(await Db.Context.ActivityEvents.CountAsync(e => e.NovelId == novel.Id), Is.EqualTo(0));
    }
}