[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/public/model/user.go

@@ -48,6 +48,10 @@ const (
 	PushThreadsNotifyProp          = "push_threads"
 	EmailThreadsNotifyProp         = "email_threads"
 
+	ReportDurationLast30Days    = "last_30_days"
+	ReportDurationPreviousMonth = "previous_month"
+	ReportDurationLast6Months   = "last_6_months"
+
 	DefaultLocale        = "en"
 	UserAuthServiceEmail = "email"
 
@@ -67,6 +71,10 @@ const (
 	DesktopTokenTTL = time.Minute * 3
 )
 
+var (
+	UserReportSortColumns = []string{"CreateAt", "Username", "FirstName", "LastName", "Nickname", "Email", "Roles"}
+)
+
 //msgp:tuple User
 
 // User contains the details about the user.
@@ -1007,3 +1015,82 @@ type UsersWithGroupsAndCount struct {
 	Users []*UserWithGroups `json:"users"`
 	Count int64             `json:"total_count"`
 }
+
+type UserPostStats struct {
+	LastLogin    int64  `json:"last_login_at,omitempty"`
+	LastStatusAt *int64 `json:"last_status_at,omitempty"`
+	LastPostDate *int64 `json:"last_post_date,omitempty"`
+	DaysActive   *int   `json:"days_active,omitempty"`
+	TotalPosts   *int   `json:"total_posts,omitempty"`
+}
+
+type UserReportQuery struct {
+	User
+	UserPostStats
+}
+
+type UserReport struct {
+	Id          string `json:"id"`
+	Username    string `json:"username"`
+	Email       string `json:"email"`
+	CreateAt    int64  `json:"create_at,omitempty"`
+	DisplayName string `json:"display_name"`
+	Roles       string `json:"roles"`
+	UserPostStats
+}
+
+type UserReportOptionsWithoutDateRange struct {
+	SortColumn          string
+	SortDesc            bool
+	PageSize            int
+	LastSortColumnValue string
+	LastUserId          string
+	Role                string
+	Team                string
+	HasNoTeam           bool
+	HideActive          bool
+	HideInactive        bool
+}
+
+type UserReportOptions struct {
+	UserReportOptionsWithoutDateRange
+	StartAt int64
+	EndAt   int64
+}
+
+type UserReportOptionsAPI struct {
+	UserReportOptionsWithoutDateRange
+	DateRange string
+}
+
+func (u *UserReportOptionsAPI) ToBaseOptions(now time.Time) *UserReportOptions {
+	startAt := int64(0)
+	endAt := int64(0)
+	if u.DateRange == ReportDurationLast30Days {
+		startAt = now.AddDate(0, 0, -30).UnixMilli()
+	} else if u.DateRange == ReportDurationPreviousMonth {
+		startOfMonth := time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, time.Local)
+		startAt = startOfMonth.AddDate(0, -1, 0).UnixMilli()
+		endAt = startOfMonth.UnixMilli()
+	} else if u.DateRange == ReportDurationLast6Months {
+		startAt = now.AddDate(0, -6, -0).UnixMilli()
+	}
+
+	return &UserReportOptions{
+		UserReportOptionsWithoutDateRange: u.UserReportOptionsWithoutDateRange,
+		StartAt:                           startAt,
+		EndAt:                             endAt,
+	}
+}
+
+func (u *UserReportQuery) ToReport() *UserReport {
+	return &UserReport{
+		Id:            u.Id,
+		Username:      u.Username,
+		Email:         u.Email,
+		CreateAt:      u.CreateAt,
+		DisplayName:   u.GetDisplayName(ShowNicknameFullName),
+		Roles:         u.Roles,
+		UserPostStats: u.UserPostStats,
+	}
+}