From b5ea38b6606fea50ac4bc42dc4109dcff258b44b Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sun, 12 Jul 2020 15:54:09 +0800
Subject: Add api in service.

---
 Timeline.Tests/Services/TimelineServiceTest.cs | 30 ++++++++++++++++
 Timeline/Services/TimelineService.cs           | 50 ++++++++++++++++++++++++++
 2 files changed, 80 insertions(+)

diff --git a/Timeline.Tests/Services/TimelineServiceTest.cs b/Timeline.Tests/Services/TimelineServiceTest.cs
index 123c2b7f..919400a3 100644
--- a/Timeline.Tests/Services/TimelineServiceTest.cs
+++ b/Timeline.Tests/Services/TimelineServiceTest.cs
@@ -56,6 +56,36 @@ namespace Timeline.Tests.Services
             _eTagGenerator.Dispose();
         }
 
+        [Theory]
+        [InlineData("@user")]
+        [InlineData("tl")]
+        public async Task Timeline_GetLastModified(string timelineName)
+        {
+            var time = _clock.ForwardCurrentTime();
+
+            var _ = TimelineHelper.ExtractTimelineName(timelineName, out var isPersonal);
+            if (!isPersonal)
+                await _timelineService.CreateTimeline(timelineName, await _userService.GetUserIdByUsername("user"));
+
+            var t = await _timelineService.GetTimelineLastModifiedTime(timelineName);
+
+            t.Should().Be(time);
+        }
+
+        [Theory]
+        [InlineData("@user")]
+        [InlineData("tl")]
+        public async Task Timeline_GetUnqiueId(string timelineName)
+        {
+            var _ = TimelineHelper.ExtractTimelineName(timelineName, out var isPersonal);
+            if (!isPersonal)
+                await _timelineService.CreateTimeline(timelineName, await _userService.GetUserIdByUsername("user"));
+
+            var uniqueId = await _timelineService.GetTimelineUniqueId(timelineName);
+
+            uniqueId.Should().NotBeNullOrEmpty();
+        }
+
         [Theory]
         [InlineData("@user")]
         [InlineData("tl")]
diff --git a/Timeline/Services/TimelineService.cs b/Timeline/Services/TimelineService.cs
index a0d72ad3..eafb0088 100644
--- a/Timeline/Services/TimelineService.cs
+++ b/Timeline/Services/TimelineService.cs
@@ -66,6 +66,32 @@ namespace Timeline.Services
     /// </summary>
     public interface ITimelineService
     {
+        /// <summary>
+        /// Get the timeline last modified time (not include name change).
+        /// </summary>
+        /// <param name="timelineName">The name of the timeline.</param>
+        /// <returns>The timeline info.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="timelineName"/> is null.</exception>
+        /// <exception cref="ArgumentException">Throw when <paramref name="timelineName"/> is of bad format.</exception>
+        /// <exception cref="TimelineNotExistException">
+        /// Thrown when timeline with name <paramref name="timelineName"/> does not exist.
+        /// If it is a personal timeline, then inner exception is <see cref="UserNotExistException"/>.
+        /// </exception>
+        Task<DateTime> GetTimelineLastModifiedTime(string timelineName);
+
+        /// <summary>
+        /// Get the timeline unique id.
+        /// </summary>
+        /// <param name="timelineName">The name of the timeline.</param>
+        /// <returns>The timeline info.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="timelineName"/> is null.</exception>
+        /// <exception cref="ArgumentException">Throw when <paramref name="timelineName"/> is of bad format.</exception>
+        /// <exception cref="TimelineNotExistException">
+        /// Thrown when timeline with name <paramref name="timelineName"/> does not exist.
+        /// If it is a personal timeline, then inner exception is <see cref="UserNotExistException"/>.
+        /// </exception>
+        Task<string> GetTimelineUniqueId(string timelineName);
+
         /// <summary>
         /// Get the timeline info.
         /// </summary>
@@ -497,6 +523,30 @@ namespace Timeline.Services
             }
         }
 
+        public async Task<DateTime> GetTimelineLastModifiedTime(string timelineName)
+        {
+            if (timelineName == null)
+                throw new ArgumentNullException(nameof(timelineName));
+
+            var timelineId = await FindTimelineId(timelineName);
+
+            var timelineEntity = await _database.Timelines.Where(t => t.Id == timelineId).Select(t => new { t.LastModified }).SingleAsync();
+
+            return timelineEntity.LastModified;
+        }
+
+        public async Task<string> GetTimelineUniqueId(string timelineName)
+        {
+            if (timelineName == null)
+                throw new ArgumentNullException(nameof(timelineName));
+
+            var timelineId = await FindTimelineId(timelineName);
+
+            var timelineEntity = await _database.Timelines.Where(t => t.Id == timelineId).Select(t => new { t.UniqueId }).SingleAsync();
+
+            return timelineEntity.UniqueId;
+        }
+
         public async Task<Models.Timeline> GetTimeline(string timelineName)
         {
             if (timelineName == null)
-- 
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