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// Copyright (C) 2024 Vaughn Nugent
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
using Microsoft.EntityFrameworkCore;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Collections.Generic;
using VNLib.Utils;
using VNLib.Plugins.Extensions.Data;
using VNLib.Plugins.Extensions.Loading;
using VNLib.Plugins.Extensions.Data.Abstractions;
namespace SimpleBookmark.Model
{
internal sealed class BookmarkStore(IAsyncLazy<DbContextOptions> dbOptions) : DbStore<BookmarkEntry>
{
///<inheritdoc/>
public override IDbQueryLookup<BookmarkEntry> QueryTable { get; } = new BookmarkQueryLookup();
///<inheritdoc/>
public override IDbContextHandle GetNewContext() => new SimpleBookmarkContext(dbOptions.Value);
///<inheritdoc/>
public override string GetNewRecordId() => Guid.NewGuid().ToString("n");
///<inheritdoc/>
public override void OnRecordUpdate(BookmarkEntry newRecord, BookmarkEntry existing)
{
//Update existing record
existing.Name = newRecord.Name;
existing.Url = newRecord.Url;
existing.Description = newRecord.Description;
existing.JsonTags = newRecord.JsonTags;
}
public async Task<BookmarkEntry[]> SearchBookmarksAsync(string userId, string? query, string[] tags, int limit, int page, CancellationToken cancellation)
{
ArgumentNullException.ThrowIfNull(userId);
ArgumentNullException.ThrowIfNull(tags);
ArgumentOutOfRangeException.ThrowIfLessThanOrEqual(limit, 0);
ArgumentOutOfRangeException.ThrowIfNegative(page);
//Init new db connection
await using SimpleBookmarkContext context = new(dbOptions.Value);
await context.OpenTransactionAsync(cancellation);
//Start with userid
IQueryable<BookmarkEntry> q = context.Bookmarks.Where(b => b.UserId == userId);
if (tags.Length > 0)
{
//if tags are set, only return bookmarks that match the tags
q = q.Where(b => b.Tags != null && tags.All(t => b.Tags!.Contains(t)));
}
if (!string.IsNullOrWhiteSpace(query))
{
//if query is set, only return bookmarks that match the query
q = q.Where(b => EF.Functions.Like(b.Name, $"%{query}%") || EF.Functions.Like(b.Description, $"%{query}%"));
}
//return bookmarks in descending order of creation
q = q.OrderByDescending(static b => b.Created);
//return only the requested page
q = q.Skip(page * limit).Take(limit);
//execute query
BookmarkEntry[] results = await q.ToArrayAsync(cancellation);
//Close db and commit transaction
await context.SaveAndCloseAsync(true, cancellation);
return results;
}
public async Task<string[]> GetAllTagsForUserAsync(string userId, CancellationToken cancellation)
{
ArgumentNullException.ThrowIfNull(userId);
//Init new db connection
await using SimpleBookmarkContext context = new(dbOptions.Value);
await context.OpenTransactionAsync(cancellation);
//Get all tags for the user
string[] tags = await context.Bookmarks
.Where(b => b.UserId == userId)
.Select(static b => b.Tags!)
.ToArrayAsync(cancellation);
//Close db and commit transaction
await context.SaveAndCloseAsync(true, cancellation);
//Split tags into individual strings
return tags
.Where(static t => !string.IsNullOrWhiteSpace(t))
.SelectMany(static t => t!.Split(','))
.Distinct()
.ToArray();
}
public async Task<ERRNO> AddBulkAsync(IEnumerable<BookmarkEntry> bookmarks, string userId, DateTimeOffset now, CancellationToken cancellation)
{
//Init new db connection
await using SimpleBookmarkContext context = new(dbOptions.Value);
await context.OpenTransactionAsync(cancellation);
//Setup clean bookmark instances
bookmarks = bookmarks.Select(b => new BookmarkEntry
{
Id = GetNewRecordId(), //new uuid
UserId = userId, //Set userid
LastModified = now.DateTime,
//Allow reuse of created time
Created = b.Created,
Description = b.Description,
Name = b.Name,
Tags = b.Tags,
Url = b.Url,
});
//Filter out bookmarks that already exist
bookmarks = bookmarks.Where(b => !context.Bookmarks.Any(b2 => b2.UserId == userId && b2.Url == b.Url));
//Add bookmarks to db
context.AddRange(bookmarks);
//Commit transaction
return await context.SaveAndCloseAsync(true, cancellation);
}
private sealed class BookmarkQueryLookup : IDbQueryLookup<BookmarkEntry>
{
public IQueryable<BookmarkEntry> GetCollectionQueryBuilder(IDbContextHandle context, params string[] constraints)
{
string userId = constraints[0];
return from b in context.Set<BookmarkEntry>()
where b.UserId == userId
orderby b.Created descending
select b;
}
public IQueryable<BookmarkEntry> GetSingleQueryBuilder(IDbContextHandle context, params string[] constraints)
{
string bookmarkId = constraints[0];
string userId = constraints[1];
return from b in context.Set<BookmarkEntry>()
where b.UserId == userId && b.Id == bookmarkId
select b;
}
}
}
}
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