[FA-24] Reading lists

FictionArchive.Service.UserNovelDataService/GraphQL/Mutation.cs

@@ -106,4 +106,393 @@ public class Mutation
 
         return new BookmarkPayload { Success = true };
     }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<ReadingListPayload> CreateReadingList(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        CreateReadingListInput input)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        if (string.IsNullOrWhiteSpace(input.Name))
+        {
+            throw new InvalidOperationException("Reading list name is required");
+        }
+
+        var user = await dbContext.Users
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            user = new User { OAuthProviderId = oAuthProviderId };
+            dbContext.Users.Add(user);
+            await dbContext.SaveChangesAsync();
+        }
+
+        var readingList = new ReadingList
+        {
+            UserId = user.Id,
+            Name = input.Name.Trim(),
+            Description = input.Description?.Trim()
+        };
+
+        dbContext.ReadingLists.Add(readingList);
+        await dbContext.SaveChangesAsync();
+
+        return new ReadingListPayload
+        {
+            Success = true,
+            ReadingList = new ReadingListDto
+            {
+                Id = readingList.Id,
+                Name = readingList.Name,
+                Description = readingList.Description,
+                Items = [],
+                ItemCount = 0,
+                CreatedTime = readingList.CreatedTime
+            }
+        };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<ReadingListPayload> UpdateReadingList(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        UpdateReadingListInput input)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        if (string.IsNullOrWhiteSpace(input.Name))
+        {
+            throw new InvalidOperationException("Reading list name is required");
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var readingList = await dbContext.ReadingLists
+            .Include(r => r.Items)
+            .FirstOrDefaultAsync(r => r.Id == input.Id && r.UserId == user.Id);
+
+        if (readingList == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        readingList.Name = input.Name.Trim();
+        readingList.Description = input.Description?.Trim();
+
+        await dbContext.SaveChangesAsync();
+
+        return new ReadingListPayload
+        {
+            Success = true,
+            ReadingList = new ReadingListDto
+            {
+                Id = readingList.Id,
+                Name = readingList.Name,
+                Description = readingList.Description,
+                Items = readingList.Items.OrderBy(i => i.Order).Select(i => new ReadingListItemDto
+                {
+                    NovelId = i.NovelId,
+                    Order = i.Order,
+                    AddedTime = i.CreatedTime
+                }),
+                ItemCount = readingList.Items.Count,
+                CreatedTime = readingList.CreatedTime
+            }
+        };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<DeleteReadingListPayload> DeleteReadingList(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        int id)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new DeleteReadingListPayload { Success = false };
+        }
+
+        var readingList = await dbContext.ReadingLists
+            .FirstOrDefaultAsync(r => r.Id == id && r.UserId == user.Id);
+
+        if (readingList == null)
+        {
+            return new DeleteReadingListPayload { Success = false };
+        }
+
+        dbContext.ReadingLists.Remove(readingList);
+        await dbContext.SaveChangesAsync();
+
+        return new DeleteReadingListPayload { Success = true };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<ReadingListPayload> AddToReadingList(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        AddToReadingListInput input)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var readingList = await dbContext.ReadingLists
+            .Include(r => r.Items)
+            .FirstOrDefaultAsync(r => r.Id == input.ReadingListId && r.UserId == user.Id);
+
+        if (readingList == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        // Idempotent: if already in list, return success
+        var existingItem = readingList.Items.FirstOrDefault(i => i.NovelId == input.NovelId);
+        if (existingItem != null)
+        {
+            return new ReadingListPayload
+            {
+                Success = true,
+                ReadingList = new ReadingListDto
+                {
+                    Id = readingList.Id,
+                    Name = readingList.Name,
+                    Description = readingList.Description,
+                    Items = readingList.Items.OrderBy(i => i.Order).Select(i => new ReadingListItemDto
+                    {
+                        NovelId = i.NovelId,
+                        Order = i.Order,
+                        AddedTime = i.CreatedTime
+                    }),
+                    ItemCount = readingList.Items.Count,
+                    CreatedTime = readingList.CreatedTime
+                }
+            };
+        }
+
+        // Add at the end (highest order + 1)
+        var maxOrder = readingList.Items.Any() ? readingList.Items.Max(i => i.Order) : -1;
+        var newItem = new ReadingListItem
+        {
+            ReadingListId = readingList.Id,
+            NovelId = input.NovelId,
+            Order = maxOrder + 1
+        };
+
+        dbContext.ReadingListItems.Add(newItem);
+        await dbContext.SaveChangesAsync();
+
+        // Reload to get updated items
+        readingList = await dbContext.ReadingLists
+            .AsNoTracking()
+            .Include(r => r.Items.OrderBy(i => i.Order))
+            .FirstAsync(r => r.Id == input.ReadingListId);
+
+        return new ReadingListPayload
+        {
+            Success = true,
+            ReadingList = new ReadingListDto
+            {
+                Id = readingList.Id,
+                Name = readingList.Name,
+                Description = readingList.Description,
+                Items = readingList.Items.Select(i => new ReadingListItemDto
+                {
+                    NovelId = i.NovelId,
+                    Order = i.Order,
+                    AddedTime = i.CreatedTime
+                }),
+                ItemCount = readingList.Items.Count,
+                CreatedTime = readingList.CreatedTime
+            }
+        };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<ReadingListPayload> RemoveFromReadingList(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        int listId,
+        uint novelId)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var readingList = await dbContext.ReadingLists
+            .Include(r => r.Items)
+            .FirstOrDefaultAsync(r => r.Id == listId && r.UserId == user.Id);
+
+        if (readingList == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var item = readingList.Items.FirstOrDefault(i => i.NovelId == novelId);
+        if (item != null)
+        {
+            dbContext.ReadingListItems.Remove(item);
+            await dbContext.SaveChangesAsync();
+        }
+
+        // Reload to get updated items
+        readingList = await dbContext.ReadingLists
+            .AsNoTracking()
+            .Include(r => r.Items.OrderBy(i => i.Order))
+            .FirstAsync(r => r.Id == listId);
+
+        return new ReadingListPayload
+        {
+            Success = true,
+            ReadingList = new ReadingListDto
+            {
+                Id = readingList.Id,
+                Name = readingList.Name,
+                Description = readingList.Description,
+                Items = readingList.Items.Select(i => new ReadingListItemDto
+                {
+                    NovelId = i.NovelId,
+                    Order = i.Order,
+                    AddedTime = i.CreatedTime
+                }),
+                ItemCount = readingList.Items.Count,
+                CreatedTime = readingList.CreatedTime
+            }
+        };
+    }
+
+    [Authorize]
+    [Error<InvalidOperationException>]
+    public async Task<ReadingListPayload> ReorderReadingListItem(
+        UserNovelDataServiceDbContext dbContext,
+        ClaimsPrincipal claimsPrincipal,
+        ReorderReadingListItemInput input)
+    {
+        var oAuthProviderId = claimsPrincipal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(oAuthProviderId))
+        {
+            throw new InvalidOperationException("Unable to determine current user identity");
+        }
+
+        var user = await dbContext.Users
+            .AsNoTracking()
+            .FirstOrDefaultAsync(u => u.OAuthProviderId == oAuthProviderId);
+
+        if (user == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var readingList = await dbContext.ReadingLists
+            .Include(r => r.Items)
+            .FirstOrDefaultAsync(r => r.Id == input.ReadingListId && r.UserId == user.Id);
+
+        if (readingList == null)
+        {
+            return new ReadingListPayload { Success = false };
+        }
+
+        var item = readingList.Items.FirstOrDefault(i => i.NovelId == input.NovelId);
+        if (item == null)
+        {
+            throw new InvalidOperationException("Novel not found in reading list");
+        }
+
+        var oldOrder = item.Order;
+        var newOrder = input.NewOrder;
+
+        // Shift other items
+        if (newOrder < oldOrder)
+        {
+            // Moving up: shift items between newOrder and oldOrder down
+            foreach (var i in readingList.Items.Where(x => x.Order >= newOrder && x.Order < oldOrder))
+            {
+                i.Order++;
+            }
+        }
+        else if (newOrder > oldOrder)
+        {
+            // Moving down: shift items between oldOrder and newOrder up
+            foreach (var i in readingList.Items.Where(x => x.Order > oldOrder && x.Order <= newOrder))
+            {
+                i.Order--;
+            }
+        }
+
+        item.Order = newOrder;
+        await dbContext.SaveChangesAsync();
+
+        return new ReadingListPayload
+        {
+            Success = true,
+            ReadingList = new ReadingListDto
+            {
+                Id = readingList.Id,
+                Name = readingList.Name,
+                Description = readingList.Description,
+                Items = readingList.Items.OrderBy(i => i.Order).Select(i => new ReadingListItemDto
+                {
+                    NovelId = i.NovelId,
+                    Order = i.Order,
+                    AddedTime = i.CreatedTime
+                }),
+                ItemCount = readingList.Items.Count,
+                CreatedTime = readingList.CreatedTime
+            }
+        };
+    }
 }