add lookback on start, added parsing for ','s

bot/bot.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -144,6 +145,85 @@ func (b *Bot) RegisterCommands() error {
 func (b *Bot) onReady(s *discordgo.Session, r *discordgo.Ready) {
 	log.Printf("logged in as %s#%s", r.User.Username, r.User.Discriminator)
 	_ = s.UpdateGameStatus(0, "tracking your KMs 🚴")
+	go b.recoverMissingLogs(context.Background())
+}
+
+func (b *Bot) recoverMissingLogs(ctx context.Context) {
+	channels, err := b.db.GetAllChannelSettings(ctx)
+	if err != nil {
+		log.Printf("recoverMissingLogs: get channels: %v", err)
+		return
+	}
+
+	cutoff := time.Now().Add(-7 * 24 * time.Hour)
+
+	for guildID, channelID := range channels {
+		recovered := 0
+		beforeID := ""
+
+		for {
+			msgs, err := b.session.ChannelMessages(channelID, 100, beforeID, "", "")
+			if err != nil {
+				log.Printf("recoverMissingLogs: fetch messages %s: %v", channelID, err)
+				break
+			}
+			if len(msgs) == 0 {
+				break
+			}
+
+			done := false
+			for _, msg := range msgs {
+				if msg.Author == nil || msg.Author.Bot {
+					continue
+				}
+				if snowflakeTime(msg.ID).Before(cutoff) {
+					done = true
+					continue
+				}
+				if hasCheckmark(msg) {
+					continue
+				}
+				km, ok := parser.ParseKM(msg.Content)
+				if !ok {
+					continue
+				}
+				added, err := b.db.AddLog(ctx, guildID, msg.Author.ID, displayName(msg.Member, msg.Author), msg.ID, channelID, km)
+				if err != nil {
+					log.Printf("recoverMissingLogs: AddLog: %v", err)
+					continue
+				}
+				if added {
+					_ = b.session.MessageReactionAdd(channelID, msg.ID, reactionOK)
+					recovered++
+					log.Printf("recoverMissingLogs: recovered %.2f km from %s", km, msg.Author.Username)
+				}
+			}
+
+			if done {
+				break
+			}
+			beforeID = msgs[len(msgs)-1].ID
+		}
+
+		log.Printf("recoverMissingLogs: guild %s done, recovered %d rides", guildID, recovered)
+	}
+}
+
+func snowflakeTime(id string) time.Time {
+	sf, err := strconv.ParseInt(id, 10, 64)
+	if err != nil {
+		return time.Time{}
+	}
+	return time.Unix(0, ((sf>>22)+1420070400000)*int64(time.Millisecond))
+}
+
+func hasCheckmark(msg *discordgo.Message) bool {
+	for _, r := range msg.Reactions {
+		if r.Emoji.Name == reactionOK && r.Me {
+			return true
+		}
+	}
+	return false
 }
 
 func (b *Bot) onMessageCreate(s *discordgo.Session, m *discordgo.MessageCreate) {