From 2541f11b5d637d47b39f25cc03dc4173a6b7efe6 Mon Sep 17 00:00:00 2001
From: 杨宇千 <crupest@outlook.com>
Date: Thu, 22 Aug 2019 14:54:47 +0800
Subject: Add nickname. Step 1.

---
 Timeline/Entities/UserDetail.cs        |  3 +++
 Timeline/Models/UserDetail.cs          |  7 ++++-
 Timeline/Services/UserDetailService.cs | 48 +++++++++++++++++++++++++++++-----
 3 files changed, 50 insertions(+), 8 deletions(-)

(limited to 'Timeline')

diff --git a/Timeline/Entities/UserDetail.cs b/Timeline/Entities/UserDetail.cs
index 9bc6f5e5..6e582234 100644
--- a/Timeline/Entities/UserDetail.cs
+++ b/Timeline/Entities/UserDetail.cs
@@ -9,6 +9,9 @@ namespace Timeline.Entities
         [Column("id"), Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
         public long Id { get; set; }
 
+        [Column("nickname"), MaxLength(15)]
+        public string Nickname { get; set; }
+
         [Column("qq"), MaxLength(15)]
         public string QQ { get; set; }
 
diff --git a/Timeline/Models/UserDetail.cs b/Timeline/Models/UserDetail.cs
index 4af88450..86866d8b 100644
--- a/Timeline/Models/UserDetail.cs
+++ b/Timeline/Models/UserDetail.cs
@@ -1,10 +1,14 @@
-using Timeline.Entities;
+using System.ComponentModel.DataAnnotations;
+using Timeline.Entities;
 using Timeline.Models.Validation;
 
 namespace Timeline.Models
 {
     public class UserDetail
     {
+        [MaxLength(10)]
+        public string Nickname { get; set; }
+
         [ValidateWith(typeof(UserDetailValidators.QQValidator))]
         public string QQ { get; set; }
 
@@ -28,6 +32,7 @@ namespace Timeline.Models
         {
             return new UserDetail
             {
+                Nickname = CoerceEmptyToNull(entity.Nickname),
                 QQ = CoerceEmptyToNull(entity.QQ),
                 EMail = CoerceEmptyToNull(entity.EMail),
                 PhoneNumber = CoerceEmptyToNull(entity.PhoneNumber),
diff --git a/Timeline/Services/UserDetailService.cs b/Timeline/Services/UserDetailService.cs
index 0bb745f3..a8ed662b 100644
--- a/Timeline/Services/UserDetailService.cs
+++ b/Timeline/Services/UserDetailService.cs
@@ -11,6 +11,15 @@ namespace Timeline.Services
 {
     public interface IUserDetailService
     {
+        /// <summary>
+        /// Get the nickname of user.
+        /// </summary>
+        /// <param name="username">The username to get nickname of.</param>
+        /// <returns>The user's nickname. Null if not set.</returns>
+        /// <exception cref="ArgumentException">Thrown if <paramref name="username"/> is null or empty.</exception>
+        /// <exception cref="UserNotExistException">Thrown if user doesn't exist.</exception>
+        Task<string> GetUserNickname(string username);
+
         /// <summary>
         /// Get the detail of user.
         /// </summary>
@@ -42,23 +51,45 @@ namespace Timeline.Services
             _databaseContext = databaseContext;
         }
 
+        private async Task<UserDetailEntity> CreateEntity(long userId)
+        {
+            var entity = new UserDetailEntity()
+            {
+                UserId = userId
+            };
+            _databaseContext.UserDetails.Add(entity);
+            await _databaseContext.SaveChangesAsync();
+            _logger.LogInformation("An entity is created in user_details.");
+            return entity;
+        }
+
         // Check the existence of user detail entry
         private async Task<UserDetailEntity> CheckAndInit(long userId)
         {
             var detail = await _databaseContext.UserDetails.Where(e => e.UserId == userId).SingleOrDefaultAsync();
             if (detail == null)
             {
-                detail = new UserDetailEntity()
-                {
-                    UserId = userId
-                };
-                _databaseContext.UserDetails.Add(detail);
-                await _databaseContext.SaveChangesAsync();
-                _logger.LogInformation("An entity is created in user_details.");
+                detail = await CreateEntity(userId);
             }
             return detail;
         }
 
+        public async Task<string> GetUserNickname(string username)
+        {
+            var userId = await DatabaseExtensions.CheckAndGetUser(_databaseContext.Users, username);
+            var detail = await _databaseContext.UserDetails.Where(e => e.UserId == userId).Select(e => new { e.Nickname }).SingleOrDefaultAsync();
+            if (detail == null)
+            {
+                var entity = await CreateEntity(userId);
+                return null;
+            }
+            else
+            {
+                var nickname = detail.Nickname;
+                return string.IsNullOrEmpty(nickname) ? null : nickname;
+            }
+        }
+
         public async Task<UserDetail> GetUserDetail(string username)
         {
             var userId = await DatabaseExtensions.CheckAndGetUser(_databaseContext.Users, username);
@@ -74,6 +105,9 @@ namespace Timeline.Services
             var userId = await DatabaseExtensions.CheckAndGetUser(_databaseContext.Users, username);
             var detailEntity = await CheckAndInit(userId);
 
+            if (detail.Nickname != null)
+                detailEntity.Nickname = detail.Nickname;
+
             if (detail.QQ != null)
                 detailEntity.QQ = detail.QQ;
 
-- 
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