From c10dc9e221317ea39f9ce0f172670ffbe94e6f8a Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Thu, 27 Aug 2020 23:20:14 +0800
Subject: Timeline service add change timeline name api.

---
 Timeline/Services/TimelineService.cs | 50 ++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

(limited to 'Timeline/Services/TimelineService.cs')

diff --git a/Timeline/Services/TimelineService.cs b/Timeline/Services/TimelineService.cs
index 2f0bf2c5..0a3a2076 100644
--- a/Timeline/Services/TimelineService.cs
+++ b/Timeline/Services/TimelineService.cs
@@ -5,6 +5,7 @@ using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 using Timeline.Entities;
 using Timeline.Helpers;
@@ -357,6 +358,21 @@ namespace Timeline.Services
         /// <exception cref="ArgumentException">Thrown when timeline name is invalid.</exception>
         /// <exception cref="TimelineNotExistException">Thrown when the timeline does not exist.</exception>
         Task DeleteTimeline(string timelineName);
+
+        /// <summary>
+        /// Change name of a timeline.
+        /// </summary>
+        /// <param name="oldTimelineName">The old timeline name.</param>
+        /// <param name="newTimelineName">The new timeline name.</param>
+        /// <returns>The new timeline info.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="oldTimelineName"/> or <paramref name="newTimelineName"/> is null.</exception>
+        /// <exception cref="ArgumentException">Thrown when <paramref name="oldTimelineName"/> or <paramref name="newTimelineName"/> is of invalid format.</exception>
+        /// <exception cref="TimelineNotExistException">Thrown when timeline does not exist.</exception>
+        /// <exception cref="EntityAlreadyExistException">Thrown when a timeline with new name already exists.</exception>
+        /// <remarks>
+        /// You can only change name of general timeline.
+        /// </remarks>
+        Task<Models.Timeline> ChangeTimelineName(string oldTimelineName, string newTimelineName);
     }
 
     public class TimelineService : ITimelineService
@@ -1111,5 +1127,39 @@ namespace Timeline.Services
             _database.Timelines.Remove(entity);
             await _database.SaveChangesAsync();
         }
+
+        public async Task<Models.Timeline> ChangeTimelineName(string oldTimelineName, string newTimelineName)
+        {
+            if (oldTimelineName == null)
+                throw new ArgumentNullException(nameof(oldTimelineName));
+            if (newTimelineName == null)
+                throw new ArgumentNullException(nameof(newTimelineName));
+
+            ValidateTimelineName(oldTimelineName, nameof(oldTimelineName));
+            ValidateTimelineName(newTimelineName, nameof(newTimelineName));
+
+            var entity = await _database.Timelines.Where(t => t.Name == oldTimelineName).SingleOrDefaultAsync();
+
+            if (entity == null)
+                throw new TimelineNotExistException(oldTimelineName);
+
+            if (oldTimelineName == newTimelineName)
+                return await MapTimelineFromEntity(entity);
+
+            var conflict = await _database.Timelines.AnyAsync(t => t.Name == newTimelineName);
+
+            if (conflict)
+                throw new EntityAlreadyExistException(EntityNames.Timeline, null, ExceptionTimelineNameConflict);
+
+            var now = _clock.GetCurrentTime();
+
+            entity.Name = newTimelineName;
+            entity.NameLastModified = now;
+            entity.LastModified = now;
+
+            await _database.SaveChangesAsync();
+
+            return await MapTimelineFromEntity(entity);
+        }
     }
 }
-- 
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