[MM-55017] Add API method to get users for Admin Reporting (#25499)

* Add store method to get reporting data

* Some store changes

* Added app layer

* Added API call, some miscellaneous fixes

* Fix lint

* Fix serialized check

* Add API docs

* Fix user store tests leaking users

* Fix test

* PR feedback

* Add filtering for role/team/activated user, filter out bot users

* Fix mock

* Fix test

* Oops

* Switch to using struct filter

* More PR feedback

* Fix gen

* Fix test

* Fix API docs

* Fix test

* Fix possible SQL injection, some query optimization

* Fix migrations

* Oops

* Add role to API

* Fix check

* Add Client4 API call for load testing

* Fix test

* Update server/channels/store/storetest/user_store.go

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

* PR feedback

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

server/channels/app/user_test.go

@@ -1932,3 +1932,96 @@ func TestSendSubscriptionHistoryEvent(t *testing.T) {
 		require.Equal(t, 10, subscriptionHistoryEvent.Seats, "Number of seats doesn't match")
 	})
 }
+
+func TestGetUsersForReporting(t *testing.T) {
+	t.Run("should throw error on invalid page size", func(t *testing.T) {
+		th := Setup(t).InitBasic()
+		defer th.TearDown()
+
+		userReports, err := th.App.GetUsersForReporting(&model.UserReportOptions{
+			UserReportOptionsWithoutDateRange: model.UserReportOptionsWithoutDateRange{
+				SortColumn: "Username",
+				PageSize:   999,
+			},
+		})
+		require.Error(t, err)
+		require.Nil(t, userReports)
+	})
+
+	t.Run("should throw error on invalid date range", func(t *testing.T) {
+		th := Setup(t).InitBasic()
+		defer th.TearDown()
+
+		userReports, err := th.App.GetUsersForReporting(&model.UserReportOptions{
+			UserReportOptionsWithoutDateRange: model.UserReportOptionsWithoutDateRange{
+				SortColumn: "Username",
+				PageSize:   50,
+			},
+			StartAt: 1000,
+			EndAt:   500,
+		})
+		require.Error(t, err)
+		require.Nil(t, userReports)
+	})
+
+	t.Run("should throw error on bad sort column", func(t *testing.T) {
+		th := Setup(t).InitBasic()
+		defer th.TearDown()
+
+		userReports, err := th.App.GetUsersForReporting(&model.UserReportOptions{
+			UserReportOptionsWithoutDateRange: model.UserReportOptionsWithoutDateRange{
+				SortColumn: "FakeColumn",
+				PageSize:   50,
+			},
+		})
+		require.Error(t, err)
+		require.Nil(t, userReports)
+	})
+
+	t.Run("should return some formatted reporting data", func(t *testing.T) {
+		th := SetupWithStoreMock(t)
+		defer th.TearDown()
+
+		// Mock to get the user count
+		mockStore := th.App.Srv().Store().(*storemocks.Store)
+		mockUserStore := storemocks.UserStore{}
+		mockUserStore.On("GetUserReport",
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+		).Return([]*model.UserReportQuery{
+			{
+				User: model.User{
+					Id:        "some-id",
+					CreateAt:  1000,
+					FirstName: "Bob",
+					LastName:  "Bobson",
+				},
+				UserPostStats: model.UserPostStats{
+					LastLogin: 1500,
+				},
+			},
+		}, nil)
+
+		mockStore.On("User").Return(&mockUserStore)
+
+		userReports, err := th.App.GetUsersForReporting(&model.UserReportOptions{
+			UserReportOptionsWithoutDateRange: model.UserReportOptionsWithoutDateRange{
+				SortColumn: "Username",
+				PageSize:   50,
+			},
+		})
+		require.Nil(t, err)
+		require.NotNil(t, userReports)
+		require.Equal(t, "Bob Bobson", userReports[0].DisplayName)
+	})
+}