[MM-44084] Feature: Top threads insights (#20195)

* Add route endpoints, model, store functions, and tests for top threads

* Run make store-layers

* Make the following changes

 - Fix top user threads query
 - Fix passing parameters in api4/insights.go to handler in app
 - Add top user threads test

* Add post-message, user_id, participants information to insights results

* model.TopThread.UserID -> model.TopThread.UserId, for compatibility with MySQL

* Rename name -> channel_name

* Add user information to response

* Link post in response, filter out deleted root posts from top threads

* Handle thread delete cases, add app tests for threads insights

* lint: fix typo

* lint: rename asserts

* lint: require.nil -> require.NoError

* Add integration tests for thread insights

* Add embeds and images to top posts

* Add license checks for top threads endpoints

* Query users in batch to populate post-creator

* Make the following changes

 - Add license to test server in api4/
 - Add tests for threads insights
    - top team threads shouldn't include threads from other teams, DMs
    - Test duration constraint
    - Pagination testing for top threads in model/insights_test.go

* Add i18n-extract

* i18n fixes

* Add username, nickname to user_information

* Hide message, user_id, post_id, reply_count in depth=1 of top threads response

* Fix tests using response.reply_count to use response.post.reply_count

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/post.go

@@ -1717,3 +1717,47 @@ func (a *App) GetPostsByIds(postIDs []string) ([]*model.Post, *model.AppError) {
 
 	return posts, nil
 }
+
+func (a *App) GetTopThreadsForTeamSince(teamID, userID string, opts *model.InsightsOpts) (*model.TopThreadList, *model.AppError) {
+	if !a.Config().FeatureFlags.InsightsEnabled {
+		return nil, model.NewAppError("GetTopChannelsForTeamSince", "app.insights.feature_disabled", nil, "", http.StatusNotImplemented)
+	}
+
+	topThreads, err := a.Srv().Store.Thread().GetTopThreadsForTeamSince(teamID, userID, opts.StartUnixMilli, opts.Page*opts.PerPage, opts.PerPage)
+	if err != nil {
+		return nil, model.NewAppError("GetTopChannelsForTeamSince", "app.post.get_top_threads_for_team_since.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+	topThreadsWithEmbedAndImage, err := includeEmbedsAndImages(a, topThreads, userID)
+	if err != nil {
+		return nil, model.NewAppError("GetTopChannelsForTeamSince", "app.post.get_top_threads_for_team_since.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+	return topThreadsWithEmbedAndImage, nil
+}
+
+func (a *App) GetTopThreadsForUserSince(teamID, userID string, opts *model.InsightsOpts) (*model.TopThreadList, *model.AppError) {
+	if !a.Config().FeatureFlags.InsightsEnabled {
+		return nil, model.NewAppError("GetTopChannelsForTeamSince", "app.insights.feature_disabled", nil, "", http.StatusNotImplemented)
+	}
+
+	topThreads, err := a.Srv().Store.Thread().GetTopThreadsForUserSince(teamID, userID, opts.StartUnixMilli, opts.Page*opts.PerPage, opts.PerPage)
+	if err != nil {
+		return nil, model.NewAppError("GetTopChannelsForTeamSince", "app.post.get_top_threads_for_team_since.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+	topThreadsWithEmbedAndImage, err := includeEmbedsAndImages(a, topThreads, userID)
+	if err != nil {
+		return nil, model.NewAppError("GetTopChannelsForUserSince", "app.post.get_top_threads_for_user_since.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+	return topThreadsWithEmbedAndImage, nil
+}
+
+func includeEmbedsAndImages(a *App, topThreadList *model.TopThreadList, userID string) (*model.TopThreadList, error) {
+	for _, topThread := range topThreadList.Items {
+		topThread.Post = a.PreparePostForClientWithEmbedsAndImages(topThread.Post, false, false)
+		sanitizedPost, err := a.SanitizePostMetadataForUser(topThread.Post, userID)
+		if err != nil {
+			return nil, err
+		}
+		topThread.Post = sanitizedPost
+	}
+	return topThreadList, nil
+}