First Commit

Application/PlayLists/Contracts/PaginatedPlayListResponse.cs

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+namespace Musify.Application.PlayLists.Contracts
+{
+    public record PaginatedPlayListResponse(
+        IReadOnlyCollection<PlayListResponse> PlayLists,
+        int PageNumber,
+        int PageSize,
+        int PageCount,
+        int TotalItemCount,
+        bool HasNextPage,
+        bool HasPreviousPage
+    );
+}

Application/PlayLists/Contracts/PlayListResponse.cs

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+namespace Musify.Application.PlayLists.Contracts
+{
+    public record PlayListResponse(
+        Guid Id,
+        string Name,
+        string Description,
+        string ImageName,
+        DateTime CreatedAt,
+        DateTime UpdatedAt);
+}

Application/PlayLists/Queries/GetPlayListById/GetPlayListByIdQuery.cs

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+using Ardalis.Result;
+using DispatchR.Abstractions.Send;
+using Musify.Application.PlayLists.Contracts;
+
+namespace Musify.Application.PlayLists.Queries.GetPlayListById
+{
+    public record GetPlayListByIdQuery(Guid Id)
+        : IRequest<GetPlayListByIdQuery, Result<PlayListResponse>>;
+}

Application/PlayLists/Queries/GetPlayListById/GetPlayListByIdQueryHandler.cs

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+using Ardalis.Result;
+using DispatchR.Abstractions.Send;
+using Microsoft.EntityFrameworkCore;
+using Musify.Application.Contracts.Infrastructure;
+using Musify.Application.PlayLists.Contracts;
+
+namespace Musify.Application.PlayLists.Queries.GetPlayListById
+{
+    public class GetPlayListByIdQueryHandler(IDatabase database)
+        : IRequestHandler<GetPlayListByIdQuery, Task<Result<PlayListResponse>> >
+    {
+        public async Task<Result<PlayListResponse>> Handle(GetPlayListByIdQuery request, CancellationToken cancellationToken)
+        {
+            var playList = await database.PlayLists
+                .AsNoTracking()
+                .SingleOrDefaultAsync(p => p.Id == request.Id, cancellationToken);
+
+            return playList is not null
+                ? Result.Success(new PlayListResponse(
+                    playList.Id,
+                    playList.Name,
+                    playList.Description,
+                    playList.ImageName,
+                    playList.CreatedDate,
+                    playList.UpdatedDate))
+                : Result.NotFound("Playlist not found.");
+        }
+    }
+}

Application/PlayLists/Queries/GetPlayLists/GetPlayListsQuery.cs

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+using Ardalis.Result;
+using DispatchR.Abstractions.Send;
+using Musify.Application.PlayLists.Contracts;
+
+namespace Musify.Application.PlayLists.Queries.GetPlayLists
+{
+    public record GetPlayListsQuery(int PageNumber = 1, int PageSize = 10)
+        : IRequest<GetPlayListsQuery, Result<PaginatedPlayListResponse>>;
+}

Application/PlayLists/Queries/GetPlayLists/GetPlayListsQueryHandler.cs

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+using Ardalis.Result;
+using DispatchR.Abstractions.Send;
+using Microsoft.EntityFrameworkCore;
+using Musify.Application.Contracts.Infrastructure;
+using Musify.Application.PlayLists.Contracts;
+using X.PagedList.EF;
+
+namespace Musify.Application.PlayLists.Queries.GetPlayLists
+{
+    public class GetPlayListsQueryHandler(IDatabase database)
+        : IRequestHandler<GetPlayListsQuery, Task<Result<PaginatedPlayListResponse>> >
+    {
+        public async Task<Result<PaginatedPlayListResponse>> Handle(GetPlayListsQuery request, CancellationToken cancellationToken)
+        {
+            var pageNumber = request.PageNumber < 1 ? 1 : request.PageNumber;
+            var pageSize = request.PageSize < 1 ? 10 : request.PageSize;
+
+            var totalCount = await database.PlayLists.CountAsync(cancellationToken);
+
+            var pagedPlayLists = await database.PlayLists
+                .AsNoTracking()
+                .OrderBy(p => p.Id)
+                .Select(p => new PlayListResponse(
+                    p.Id,
+                    p.Name,
+                    p.Description,
+                    p.ImageName,
+                    p.CreatedDate,
+                    p.UpdatedDate))
+                .ToPagedListAsync(pageNumber, pageSize, totalCount, cancellationToken);
+
+            var response = new PaginatedPlayListResponse(
+                pagedPlayLists.ToArray(),
+                pagedPlayLists.PageNumber,
+                pagedPlayLists.PageSize,
+                pagedPlayLists.PageCount,
+                pagedPlayLists.TotalItemCount,
+                pagedPlayLists.HasNextPage,
+                pagedPlayLists.HasPreviousPage);
+
+            return Result.Success(response);
+        }
+    }
+}

Application/PlayLists/Queries/GetPlayListsByUserId/GetPlayListsByUserIdQuery.cs

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+using Ardalis.Result;
+using DispatchR.Abstractions.Send;
+using Musify.Application.PlayLists.Contracts;
+
+namespace Musify.Application.PlayLists.Queries.GetPlayListsByUserId
+{
+    public record GetPlayListsByUserIdQuery(
+        Guid UserId,
+        string Name = "",
+        int PageNumber = 1,
+        int PageSize = 10)
+        : IRequest<GetPlayListsByUserIdQuery, Result<PaginatedPlayListResponse>>;
+}

Application/PlayLists/Queries/GetPlayListsByUserId/GetPlayListsByUserIdQueryHandler.cs

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+using Ardalis.Result;
+using DispatchR.Abstractions.Send;
+using Microsoft.EntityFrameworkCore;
+using Musify.Application.Contracts.Infrastructure;
+using Musify.Application.PlayLists.Contracts;
+using X.PagedList.EF;
+
+namespace Musify.Application.PlayLists.Queries.GetPlayListsByUserId
+{
+    public class GetPlayListsByUserIdQueryHandler(IDatabase database)
+        : IRequestHandler<GetPlayListsByUserIdQuery, Task<Result<PaginatedPlayListResponse>> >
+    {
+        public async Task<Result<PaginatedPlayListResponse>> Handle(GetPlayListsByUserIdQuery request, CancellationToken cancellationToken)
+        {
+            var pageNumber = request.PageNumber < 1 ? 1 : request.PageNumber;
+            var pageSize = request.PageSize < 1 ? 10 : request.PageSize;
+            var normalizedName = request.Name.Trim().ToUpperInvariant();
+
+            var playListsQuery = database.PlayLists
+                .AsNoTracking()
+                .Where(p => p.UserId == request.UserId);
+
+            if (!string.IsNullOrWhiteSpace(normalizedName))
+                playListsQuery = playListsQuery.Where(p => p.NormalizedName.Contains(normalizedName));
+
+            var totalCount = await playListsQuery.CountAsync(cancellationToken);
+
+            var pagedPlayLists = await playListsQuery
+                .OrderBy(p => p.CreatedDate)
+                .Select(p => new PlayListResponse(
+                    p.Id,
+                    p.Name,
+                    p.Description,
+                    p.ImageName,
+                    p.CreatedDate,
+                    p.UpdatedDate))
+                .ToPagedListAsync(pageNumber, pageSize, totalCount, cancellationToken);
+
+            var response = new PaginatedPlayListResponse(
+                pagedPlayLists.ToArray(),
+                pagedPlayLists.PageNumber,
+                pagedPlayLists.PageSize,
+                pagedPlayLists.PageCount,
+                pagedPlayLists.TotalItemCount,
+                pagedPlayLists.HasNextPage,
+                pagedPlayLists.HasPreviousPage);
+
+            return Result.Success(response);
+        }
+    }
+}