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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Timeline.Entities;
using Timeline.Models;
using Timeline.Services.Timeline;
using Timeline.Services.User;
namespace Timeline.Services.Api
{
public class TimelineBookmarkService1 : ITimelineBookmarkService1
{
private DatabaseContext _databaseContext;
private IUserService _userService;
private ITimelineService _timelineService;
public TimelineBookmarkService1(DatabaseContext databaseContext, IUserService userService, ITimelineService timelineService)
{
_databaseContext = databaseContext;
_userService = userService;
_timelineService = timelineService;
}
public async Task<TimelineBookmark> AddBookmarkAsync(long userId, long timelineId, int? position = null)
{
var user = await _userService.GetUserAsync(userId);
var timeline = await _timelineService.GetTimelineAsync(timelineId);
var count = await _databaseContext.BookmarkTimelines.Where(b => b.UserId == userId).CountAsync();
if (position.HasValue)
{
if (position <= 0)
{
position = 1;
}
else if (position > count + 1)
{
position = count + 1;
}
}
else
{
position = count + 1;
}
await using var transaction = await _databaseContext.Database.BeginTransactionAsync();
if (position.Value < count + 1)
{
await _databaseContext.Database.ExecuteSqlRawAsync("UPDATE `bookmark_timelines` SET `rank` = `rank` + 1 WHERE `rank` >= {0} AND `user` = {1}", position.Value, userId);
}
BookmarkTimelineEntity entity = new BookmarkTimelineEntity
{
UserId = userId,
TimelineId = timelineId,
Rank = position.Value
};
_databaseContext.BookmarkTimelines.Add(entity);
await _databaseContext.SaveChangesAsync();
await _databaseContext.Database.CommitTransactionAsync();
return new TimelineBookmark(user.Username, timeline.Name is null ? "self" : timeline.Name, position.Value);
}
public async Task DeleteBookmarkAsync(long userId, long timelineId)
{
var entity = await _databaseContext.BookmarkTimelines.Where(b => b.UserId == userId && b.TimelineId == timelineId).SingleOrDefaultAsync();
if (entity is null) return;
await _databaseContext.Database.BeginTransactionAsync();
await _databaseContext.Database.ExecuteSqlRawAsync("UPDATE `bookmark_timelines` SET `rank` = `rank` - 1 WHERE `rank` > {0} AND `user` = {1}", entity.Rank, userId);
_databaseContext.BookmarkTimelines.Remove(entity);
await _databaseContext.SaveChangesAsync();
await _databaseContext.Database.CommitTransactionAsync();
}
public async Task<TimelineBookmark> GetBookmarkAsync(long userId, long timelineId)
{
var user = await _userService.GetUserAsync(userId);
var timeline = await _timelineService.GetTimelineAsync(timelineId); var entity = await _databaseContext.BookmarkTimelines.Where(b => b.UserId == userId && b.TimelineId == timelineId).SingleOrDefaultAsync();
if (entity is null)
{
throw new EntityNotExistException(EntityTypes.BookmarkTimeline, new Dictionary<string, object>
{
{ "user-id", userId },
{ "timeline-id", timelineId }
});
}
return new TimelineBookmark(user.Username, timeline.Name is null ? "self" : timeline.Name, (int)entity.Rank);
}
public async Task<Page<TimelineBookmark>> GetBookmarksAsync(long userId, int page, int pageSize)
{
if (page <= 0) throw new ArgumentOutOfRangeException(nameof(page));
if (pageSize <= 0) throw new ArgumentOutOfRangeException(nameof(pageSize));
var user = await _userService.GetUserAsync(userId);
var totalCount = await _databaseContext.BookmarkTimelines.Where(b => b.UserId == userId).CountAsync();
var entities = await _databaseContext.BookmarkTimelines.Where(b => b.UserId == userId).Skip(pageSize * (page - 1)).Take(pageSize).ToListAsync();
var items = new List<TimelineBookmark>();
foreach (var entity in entities)
{
var timeline = await _timelineService.GetTimelineAsync(entity.TimelineId);
items.Add(new TimelineBookmark(user.Username, timeline.Name is null ? "self" : timeline.Name, (int)entity.Rank));
}
return new Page<TimelineBookmark>(page, pageSize, totalCount, items);
}
public async Task<TimelineBookmark> MoveBookmarkAsync(long userId, long timelineId, int position)
{
var user = await _userService.GetUserAsync(userId);
var timeline = await _timelineService.GetTimelineAsync(timelineId);
var entity = await _databaseContext.BookmarkTimelines.SingleOrDefaultAsync(t => t.TimelineId == timelineId && t.UserId == userId);
if (entity is null)
{
throw new EntityNotExistException(EntityTypes.BookmarkTimeline);
}
var oldPosition = entity.Rank;
if (position < 1)
{
position = 1;
}
else
{
var totalCount = await _databaseContext.BookmarkTimelines.CountAsync(t => t.UserId == userId);
if (position > totalCount) position = totalCount;
}
if (oldPosition != position)
{
await using var transaction = await _databaseContext.Database.BeginTransactionAsync();
if (position > oldPosition)
{
await _databaseContext.Database.ExecuteSqlRawAsync("UPDATE `bookmark_timelines` SET `rank` = `rank` - 1 WHERE `rank` BETWEEN {0} AND {1} AND `user` = {2}", oldPosition + 1, position, userId);
await _databaseContext.Database.ExecuteSqlRawAsync("UPDATE `bookmark_timelines` SET `rank` = {0} WHERE `id` = {1}", position, entity.Id);
}
else
{
await _databaseContext.Database.ExecuteSqlRawAsync("UPDATE `bookmark_timelines` SET `rank` = `rank` + 1 WHERE `rank` BETWEEN {0} AND {1} AND `user` = {2}", position, oldPosition - 1, userId);
await _databaseContext.Database.ExecuteSqlRawAsync("UPDATE `bookmark_timelines` SET `rank` = {0} WHERE `id` = {1}", position, entity.Id);
}
await transaction.CommitAsync();
}
return new TimelineBookmark(user.Username, timeline.Name is null ? "self" : timeline.Name, (int)entity.Rank);
}
}
}
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