hopefully not a horribly foolish refactoring

Femto.Modules.Blog/Domain/Posts/Commands/GetPosts/GetPostsQueryHandler.cs

@@ -1,99 +0,0 @@
-using Dapper;
-using Femto.Modules.Blog.Domain.Posts.Commands.GetPosts.Dto;
-using Femto.Modules.Blog.Infrastructure.DbConnection;
-using MediatR;
-
-namespace Femto.Modules.Blog.Domain.Posts.Commands.GetPosts;
-
-public class GetPostsQueryHandler(IDbConnectionFactory connectionFactory)
-    : IRequestHandler<GetPostsQuery, GetPostsQueryResult>
-{
-    public async Task<GetPostsQueryResult> Handle(
-        GetPostsQuery query,
-        CancellationToken cancellationToken
-    )
-    {
-        using var conn = connectionFactory.GetConnection();
-
-        if (query.Username is not null && query.AuthorGuid is not null)
-            throw new ArgumentException(
-                "Cannot specify both username and authorGuid",
-                nameof(query)
-            );
-
-        var orderBy = query.Direction is GetPostsDirection.Backward ? "desc" : "asc";
-        var pageFilter = query.Direction is GetPostsDirection.Backward ? "<=" : ">=";
-        
-        // lang=sql
-        var sql = $$"""
-            with page as (
-                select blog.post.*, blog.author.username as Username, blog.author.id as AuthorId
-                from blog.post
-                inner join blog.author on blog.author.id = blog.post.author_id
-                where (@username is null or blog.author.username = @username)
-                and (@authorGuid is null or blog.author.id = @authorGuid)
-                and (@cursor is null or blog.post.id {{pageFilter}} @cursor)
-                order by blog.post.id {{orderBy}}
-                limit @amount
-            )
-            select
-                page.id as PostId,
-                page.content as Content,
-                blog.post_media.url as MediaUrl,
-                page.posted_on as PostedOn,
-                page.Username,
-                page.AuthorId
-                from page
-            left join blog.post_media on blog.post_media.post_id = page.id
-            order by page.id {{orderBy}}
-            """;
-
-        var result = await conn.QueryAsync<QueryResult>(
-            sql,
-            new
-            {
-                username = query.Username,
-                authorGuid = query.AuthorGuid,
-                cursor = query.From,
-                // load an extra one to take for the curst
-                amount = query.Amount + 1,
-            }
-        );
-
-        var rows = result.ToList();
-
-        var posts = rows.GroupBy(row => row.PostId)
-            .Select(group =>
-            {
-                var postId = group.Key;
-                var post = group.First();
-                var media = group
-                    .Select(row => row.MediaUrl)
-                    .OfType<string>()
-                    .Select(url => new PostMediaDto(new Uri(url)))
-                    .ToList();
-                return new PostDto(
-                    postId,
-                    post.Content,
-                    media,
-                    post.PostedOn,
-                    new PostAuthorDto(post.AuthorId, post.Username)
-                );
-            })
-            .ToList();
-
-        var next = rows.Count >= query.Amount ? rows.LastOrDefault()?.PostId : null;
-
-        return new GetPostsQueryResult(posts, next);
-    }
-
-    internal class QueryResult
-    {
-        public Guid PostId { get; set; }
-        public string Content { get; set; }
-        public string? MediaUrl { get; set; }
-        public DateTimeOffset PostedOn { get; set; }
-        public Guid AuthorId { get; set; }
-        public string Username { get; set; }
-    }
-}