using PlotLine.ViewModels;

namespace PlotLine.Models;

public sealed record StoryPosition(int ProjectId, int? BookId = null, int? ChapterId = null, int? SceneId = null)
{
    public bool IsValid => ProjectId > 0 && (BookId is null or > 0) && (ChapterId is null or > 0) && (SceneId is null or > 0);
    public bool IsScenePosition => SceneId.HasValue;

    public static StoryPosition? FromScene(SceneEditViewModel? scene)
    {
        if (scene?.Project is null)
        {
            return null;
        }

        return new StoryPosition(scene.Project.ProjectID, scene.Book?.BookID, scene.ChapterID, scene.SceneID > 0 ? scene.SceneID : null);
    }

    public static StoryPosition? FromScene(Scene? scene, int projectId)
    {
        if (scene is null || projectId <= 0)
        {
            return null;
        }

        return new StoryPosition(projectId, scene.BookID > 0 ? scene.BookID : null, scene.ChapterID, scene.SceneID);
    }

    public static StoryPosition? FromRuntimeCurrentScene(WordCompanionRuntimeCurrentSceneRequest request)
    {
        var position = new StoryPosition(request.ProjectId, request.BookId, request.ChapterId, request.SceneId);
        return position.IsValid ? position : null;
    }

    public static StoryPosition? FromRuntimeCurrentScene(WordCompanionRuntimeCurrentSceneResponse? response)
    {
        if (response is null)
        {
            return null;
        }

        var position = new StoryPosition(response.ProjectId, response.BookId, response.ChapterId, response.SceneId);
        return position.IsValid ? position : null;
    }

    public static StoryPosition? FromTimelineSelection(int projectId, int? bookId, int? chapterId, int? sceneId)
    {
        if (projectId <= 0)
        {
            return null;
        }

        var position = new StoryPosition(projectId, bookId, chapterId, sceneId);
        return position.IsValid ? position : null;
    }

    public string? SceneEditUrl => SceneId.HasValue ? $"/Scenes/Edit/{SceneId.Value}" : null;
}