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using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Timeline.Entities;
using Timeline.Services.Exceptions;
namespace Timeline.Services
{
public interface IHighlightTimelineService
{
/// <summary>
/// Get all highlight timelines.
/// </summary>
/// <returns>A list of all highlight timelines.</returns>
Task<List<Models.Timeline>> GetHighlightTimelines();
/// <summary>
/// Add a timeline to highlight list.
/// </summary>
/// <param name="timelineName">The timeline name.</param>
/// <param name="operatorId">The user id of operator.</param>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="timelineName"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown when <paramref name="timelineName"/> is not a valid timeline name.</exception>
/// <exception cref="TimelineNotExistException">Thrown when timeline with given name does not exist.</exception>
/// <exception cref="UserNotExistException">Thrown when user with given operator id does not exist.</exception>
Task AddHighlightTimeline(string timelineName, long? operatorId);
/// <summary>
/// Remove a timeline from highlight list.
/// </summary>
/// <param name="timelineName">The timeline name.</param>
/// <param name="operatorId">The user id of operator.</param>
/// <returns>True if deletion is actually performed. Otherwise false (timeline was not in the list).</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="timelineName"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown when <paramref name="timelineName"/> is not a valid timeline name.</exception>
/// <exception cref="TimelineNotExistException">Thrown when timeline with given name does not exist.</exception>
/// <exception cref="UserNotExistException">Thrown when user with given operator id does not exist.</exception>
Task<bool> RemoveHighlightTimeline(string timelineName, long? operatorId);
}
public class HighlightTimelineService : IHighlightTimelineService
{
private readonly DatabaseContext _database;
private readonly IUserService _userService;
private readonly ITimelineService _timelineService;
public HighlightTimelineService(DatabaseContext database, IUserService userService, ITimelineService timelineService)
{
_database = database;
_userService = userService;
_timelineService = timelineService;
}
public async Task AddHighlightTimeline(string timelineName, long? operatorId)
{
if (timelineName == null)
throw new ArgumentNullException(nameof(timelineName));
var timelineId = await _timelineService.GetTimelineIdByName(timelineName);
if (operatorId.HasValue && !await _userService.CheckUserExistence(operatorId.Value))
{
throw new UserNotExistException(null, operatorId.Value, "User with given operator id does not exist.", null);
}
var alreadyIs = await _database.HighlightTimelines.AnyAsync(t => t.TimelineId == timelineId);
if (alreadyIs) return;
_database.HighlightTimelines.Add(new HighlightTimelineEntity { TimelineId = timelineId, OperatorId = operatorId });
await _database.SaveChangesAsync();
}
public async Task<List<Models.Timeline>> GetHighlightTimelines()
{
var entities = await _database.HighlightTimelines.Select(t => new { t.Id }).ToListAsync();
var result = new List<Models.Timeline>();
foreach (var entity in entities)
{
result.Add(await _timelineService.GetTimelineById(entity.Id));
}
return result;
}
public async Task<bool> RemoveHighlightTimeline(string timelineName, long? operatorId)
{
if (timelineName == null)
throw new ArgumentNullException(nameof(timelineName));
var timelineId = await _timelineService.GetTimelineIdByName(timelineName);
if (operatorId.HasValue && !await _userService.CheckUserExistence(operatorId.Value))
{
throw new UserNotExistException(null, operatorId.Value, "User with given operator id does not exist.", null);
}
var entity = await _database.HighlightTimelines.SingleOrDefaultAsync(t => t.TimelineId == timelineId);
if (entity == null) return false;
_database.HighlightTimelines.Remove(entity);
await _database.SaveChangesAsync();
return true;
}
}
}
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