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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; NewsPhaser, Mastodon posts aggregator
;; Copyright (C) 2025 Gene Pasquet
;;
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(in-package :phaser)
(defvar *timeline-page-size* 50
"Maximum number of statuses retrieved from the timeline for each request")
(defvar *timeline-min-age* (* 24 3600)
"Minimum age of statuses before being considered for ranking")
(defvar *timeline-max-age* (* 48 3600) ; 48h
"Maximum age of statuses to be retrieved from timelines.")
(defvar *timeline-min-timestamp* (- (get-universal-time) *timeline-max-age*))
(defvar *timeline-max-timestamp* (- (get-universal-time) *timeline-min-age*))
(defvar *pop-favs-factor* 1)
(defvar *pop-boosts-factor* 1)
(defvar *pop-replies-factor* 1)
(defvar *max-requests* 20)
(defvar *top-statuses-to-boost* 10)
(defvar *excerpt-length* 100)
(defun outdated-statuses (page)
(remove-if
(lambda (status)
(> (tooter:created-at status) *timeline-min-timestamp*))
page))
(defun last-page-p (page)
(or (null page)
(not (null (outdated-statuses page)))))
(defun load-timeline-pages (min-id &optional (pages '()) (iter-num 0))
"Load statuses from the timeline up to *TIMELINE-MAX-AGE* or MIN-ID."
(let* ((max-id (if (null pages)
nil
(tooter:id (car (last (car pages))))))
(page (get-timeline :timeline :home
:limit *timeline-page-size*
:max-id max-id
:min-id min-id))
(statuses-and-page (if (null pages)
(list page)
(cons page pages))))
(if (or (last-page-p page) (>= iter-num *max-requests*))
(alexandria:flatten statuses-and-page)
(load-timeline-pages min-id statuses-and-page (1+ iter-num)))))
(defun load-timeline ()
(remove-if (lambda (status)
(let ((status-timestamp (tooter:created-at status)))
(or (< status-timestamp *timeline-min-timestamp*)
(> status-timestamp *timeline-max-timestamp*))))
(load-timeline-pages nil)))
(defun status-popularity (status)
(/ (+ (* (tooter:replies-count status) *pop-replies-factor*)
(* (tooter:favourites-count status) *pop-favs-factor*)
(* (tooter:reblogs-count status) *pop-boosts-factor*))
(- (get-universal-time) (tooter:created-at status))))
(defun load-top-statuses ()
(let* ((timeline (load-timeline))
(ranked-statuses (sort (mapcar (lambda (status)
`(,(status-popularity status) . ,status))
timeline)
'> :key 'car)))
(mapcar 'cdr (butlast ranked-statuses (- (length ranked-statuses) 10)))))
(defun summarize-top-statuses ()
(let ((statuses (load-top-statuses)))
(remove-if #'null
(mapcar (lambda (status)
(let ((excerpt (text-excerpt (tooter:content status) *excerpt-length*)))
(if excerpt
(format nil "~a:~%~a"
excerpt
(tooter:url status))
nil)))
statuses))))
(defun summarize-and-post-top-statuses ()
(let ((summaries (summarize-top-statuses)))
(post-toot (format nil "~{~a~%~%~}" summaries))))
(when nil
(summarize-top-statuses)
(summarize-and-post-top-statuses))
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