[MM-42739] Insights - Top Channels API Endpoint (#19953)

* [MM-42739] Initial setup for top channels for team

* [MM-42739] Add initial tests

* [MM-42739] Update tests

* [MM-42739] Add top channels for user

* [MM-42739] Fix query

* [MM-42739] Update query

* [MM-42739] Improve query performance

* [MM-42739] Remove rank

* [MM-42739] Fix tests to use new time range today

* [MM-42739] Add tests for top channels for user

* [MM-42739] Add test for pagination

* Remove top channels by time struct

* [MM-42739] Update test names

* [MM-42739] Remove rank from top reactions

* [MM-42739] Return empty array instead of nil when result is empty

* [MM-42739] Add additional tests and update permissions check for teams

* [MM-42739] Add excluded channel tests for top reactions

* [MM-42739] Move insights to api4/insights and keep time range as string until required

* [MM-42739] Update queries only check DeleteAt after union

* [MM-42739] Improve query performance by using publicchannels table

* [MM-42739] Fix broken query after merge

model/client4.go

@@ -3603,6 +3603,41 @@ func (c *Client4) AutocompleteChannelsForTeamForSearch(teamId, name string) (Cha
 	return ch, BuildResponse(r), nil
 }
 
+// GetTopChannelsForTeamSince will return an ordered list of the top channels in a given team.
+func (c *Client4) GetTopChannelsForTeamSince(teamId string, timeRange string, page int, perPage int) (*TopChannelList, *Response, error) {
+	query := fmt.Sprintf("?time_range=%v&page=%v&per_page=%v", timeRange, page, perPage)
+	r, err := c.DoAPIGet(c.teamRoute(teamId)+"/top/channels"+query, "")
+	if err != nil {
+		return nil, BuildResponse(r), err
+	}
+	defer closeBody(r)
+	var topChannels *TopChannelList
+	if jsonErr := json.NewDecoder(r.Body).Decode(&topChannels); jsonErr != nil {
+		return nil, nil, NewAppError("GetTopChannelsForTeamSince", "api.unmarshal_error", nil, jsonErr.Error(), http.StatusInternalServerError)
+	}
+	return topChannels, BuildResponse(r), nil
+}
+
+// GetTopChannelsForUserSince will return an ordered list of your top channels in a given team.
+func (c *Client4) GetTopChannelsForUserSince(teamId string, timeRange string, page int, perPage int) (*TopChannelList, *Response, error) {
+	query := fmt.Sprintf("?time_range=%v&page=%v&per_page=%v", timeRange, page, perPage)
+
+	if teamId != "" {
+		query += fmt.Sprintf("&team_id=%v", teamId)
+	}
+
+	r, err := c.DoAPIGet(c.usersRoute()+"/me/top/channels"+query, "")
+	if err != nil {
+		return nil, BuildResponse(r), err
+	}
+	defer closeBody(r)
+	var topChannels *TopChannelList
+	if jsonErr := json.NewDecoder(r.Body).Decode(&topChannels); jsonErr != nil {
+		return nil, nil, NewAppError("GetTopChannelsForUserSince", "api.unmarshal_error", nil, jsonErr.Error(), http.StatusInternalServerError)
+	}
+	return topChannels, BuildResponse(r), nil
+}
+
 // Post Section
 
 // CreatePost creates a post based on the provided post struct.