using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using NovelSoftware.Application;
using NovelSoftware.Application.Dtos;
using NovelSoftware.Application.Services;
using NovelSoftware.Domain;

namespace NovelSoftware.Tests;

public class ProjectDataTests : IDisposable
{
    private readonly TestDatabase _db = new();
    private readonly TagService _tags;
    private readonly ProjectService _projects;
    private readonly CharacterService _characters;
    private readonly ChapterService _chapters;
    private readonly SceneService _scenes;

    public ProjectDataTests()
    {
        _tags = new TagService(_db.Context);
        _projects = new ProjectService(_db.Context);
        _characters = new CharacterService(_db.Context, _tags);
        _chapters = new ChapterService(_db.Context, _tags);
        _scenes = new SceneService(_db.Context);
    }

    private async Task<Guid> NewProjectAsync() =>
        (await _projects.CreateAsync(new CreateProjectRequest("The Salt Road"))).Id;

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

        var afterPartialUpdate = await _projects.UpdateAsync(id, new UpdateProjectRequest(Title: "The Salt Road"));

        afterPartialUpdate.Title.Should().Be("The Salt Road");
        afterPartialUpdate.Genre.Should().Be("Fantasy");
        afterPartialUpdate.Logline.Should().Be("A cartographer goes to sea.");

        var afterClear = await _projects.UpdateAsync(id, new UpdateProjectRequest(Genre: ""));

        afterClear.Genre.Should().BeNull();
        afterClear.Logline.Should().Be("A cartographer goes to sea.");
    }

    [Fact]
    public async Task Chapters_are_numbered_in_sequence_when_no_number_is_given()
    {
        var projectId = await NewProjectAsync();

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

        first.Number.Should().Be(1);
        second.Number.Should().Be(2);
    }

    [Fact]
    public async Task Word_count_is_recomputed_whenever_prose_changes()
    {
        var projectId = await NewProjectAsync();
        var chapter = await _chapters.CreateAsync(projectId, new CreateChapterRequest("Landfall"));

        var scene = await _scenes.CreateAsync(chapter.Id, new CreateSceneRequest(
            "The dock at dawn", Prose: "Five words go right here"));

        scene.WordCount.Should().Be(5);

        var rewritten = await _scenes.UpdateAsync(scene.Id, new UpdateSceneRequest(
            Prose: "Now\nthere  are   seven words in total"));

        rewritten.WordCount.Should().Be(7);

        var cleared = await _scenes.UpdateAsync(scene.Id, new UpdateSceneRequest(Prose: ""));

        cleared.Prose.Should().BeNull();
        cleared.WordCount.Should().Be(0);
    }

    [Fact]
    public async Task Scene_updates_that_omit_prose_leave_the_draft_untouched()
    {
        var projectId = await NewProjectAsync();
        var chapter = await _chapters.CreateAsync(projectId, new CreateChapterRequest("Landfall"));
        var scene = await _scenes.CreateAsync(chapter.Id, new CreateSceneRequest(
            "The dock at dawn", Prose: "The tide came in slow."));

        var updated = await _scenes.UpdateAsync(scene.Id, new UpdateSceneRequest(Status: DraftStatus.Revised));

        updated.Prose.Should().Be("The tide came in slow.");
        updated.WordCount.Should().Be(5);
        updated.Status.Should().Be(DraftStatus.Revised);
    }

    [Fact]
    public async Task Deleting_a_project_takes_its_characters_chapters_and_scenes()
    {
        var projectId = await NewProjectAsync();
        await _characters.CreateAsync(projectId, new CreateCharacterRequest("Ines"));
        var chapter = await _chapters.CreateAsync(projectId, new CreateChapterRequest("Landfall"));
        await _scenes.CreateAsync(chapter.Id, new CreateSceneRequest("The dock at dawn"));

        await _projects.DeleteAsync(projectId);

        using var verification = _db.CreateContext();
        (await verification.Projects.CountAsync()).Should().Be(0);
        (await verification.Characters.CountAsync()).Should().Be(0);
        (await verification.Chapters.CountAsync()).Should().Be(0);
        (await verification.Scenes.CountAsync()).Should().Be(0);
    }

    [Fact]
    public async Task Relating_characters_across_projects_is_refused()
    {
        var firstProject = await NewProjectAsync();
        var secondProject = (await _projects.CreateAsync(new CreateProjectRequest("Other Book"))).Id;

        var ines = await _characters.CreateAsync(firstProject, new CreateCharacterRequest("Ines"));
        var stranger = await _characters.CreateAsync(secondProject, new CreateCharacterRequest("Stranger"));

        var relate = async () => await _characters.AddRelationshipAsync(
            ines.Id, new CreateRelationshipRequest(stranger.Id, "sister"));

        await relate.Should().ThrowAsync<InvalidOperationException>()
            .WithMessage("*same project*");
    }

    [Fact]
    public async Task Relationships_resolve_the_other_character_by_name()
    {
        var projectId = await NewProjectAsync();
        var ines = await _characters.CreateAsync(projectId, new CreateCharacterRequest("Ines"));
        var mara = await _characters.CreateAsync(projectId, new CreateCharacterRequest("Mara"));

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

        updated.Relationships.Should().ContainSingle()
            .Which.RelatedCharacterName.Should().Be("Mara");
    }

    [Fact]
    public async Task Reading_a_missing_project_reports_not_found()
    {
        var get = async () => await _projects.GetAsync(Guid.NewGuid());

        await get.Should().ThrowAsync<NotFoundException>();
    }

    public void Dispose() => _db.Dispose();
}