From 5686725d2b890488bdb14064077637cbbb7667f6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adam=20Zahradn=C3=ADk?= <adam@zahradnik.xyz>
Date: Fri, 8 Mar 2024 22:50:03 +0100
Subject: [PATCH] ping users that still did not respond

---
 ping.go      | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 scheduler.go | 17 +++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 ping.go

diff --git a/ping.go b/ping.go
new file mode 100644
index 0000000..a695740
--- /dev/null
+++ b/ping.go
@@ -0,0 +1,69 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/charmbracelet/log"
+	"github.com/slack-go/slack"
+	bolt "go.etcd.io/bbolt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const pingCron = "30 12 * * 1,3,5"
+
+func PingMissingUsers() error {
+	users := map[string][]string{}
+
+	err := App.db.View(func(tx *bolt.Tx) error {
+		return tx.Bucket([]byte("messages")).ForEach(func(k, v []byte) error {
+			var qi QuestionInstance
+			err := json.Unmarshal(v, &qi)
+			if err != nil {
+				return err
+			}
+
+			err = qi.LoadQuestion()
+			if err != nil {
+				return err
+			}
+
+			ts, err := strconv.ParseFloat(qi.Timestamp, 64)
+			if err != nil {
+				log.Error("Cannot parse timestamp for message.", "message", string(k), "err", err)
+				return nil // we ignore this error as it should not really happen, and it should not break the loop
+			}
+
+			posted := time.Unix(int64(ts), 0)
+			if time.Now().Sub(posted) < 24*time.Hour {
+				return nil
+			}
+
+			for user, replied := range qi.Responses {
+				if replied {
+					users[user] = append(users[user], qi.Question.Channel)
+				}
+			}
+			return nil
+		})
+	})
+	if err != nil {
+		return err
+	}
+
+	for user, channels := range users {
+		log.Info("Pinging.", "user", user, "channels", channels)
+		msg := "Ahoj, zatiaľ si sa nevyjadril/-a do môjho update threadu v týchto kanáloch:\n%s\nNájdi si prosím minútku a doplň odpovede 😇"
+		var channelMentions []string
+		for _, channel := range channels {
+			channelMentions = append(channelMentions, fmt.Sprintf("<#%s>", channel))
+		}
+
+		_, _, err := App.slack.PostMessage(user, slack.MsgOptionText(fmt.Sprintf(msg, strings.Join(channelMentions, ", ")), false))
+		if err != nil {
+			log.Error("Could not send ping message.", "user", user, "err", err)
+		}
+	}
+	return nil
+}
diff --git a/scheduler.go b/scheduler.go
index c9bd284..24670ff 100644
--- a/scheduler.go
+++ b/scheduler.go
@@ -69,6 +69,23 @@ func (s *scheduler) tickPeriodicCheck(now time.Time) {
 	}
 }
 
+func (s *scheduler) tickPing(now time.Time) {
+	due, err := s.gron.IsDue(pingCron, now)
+	if err != nil {
+		s.logger.Error("Error while checking cron.", "err", err)
+		return
+	}
+
+	if due {
+		s.logger.Info("Pinging all missing users.")
+		err = PingMissingUsers()
+		if err != nil {
+			s.logger.Error("Error while pinging users.", "err", err)
+			return
+		}
+	}
+}
+
 func RunScheduler() {
 	defer App.wg.Done()