From 880b253d1261252cdeb784c125ea637c9ca1cd0e Mon Sep 17 00:00:00 2001
From: fiatjaf <fiatjaf@gmail.com>
Date: Mon, 15 Dec 2025 12:36:35 -0300
Subject: [PATCH] eventstore/mmm: stats.

---
 eventstore/mmm/fuzz_test.go |  10 +++
 eventstore/mmm/stats.go     | 135 ++++++++++++++++++++++++++++++++++++
 2 files changed, 145 insertions(+)
 create mode 100644 eventstore/mmm/stats.go

diff --git a/eventstore/mmm/fuzz_test.go b/eventstore/mmm/fuzz_test.go
index 5d23c83..a9c0203 100644
--- a/eventstore/mmm/fuzz_test.go
+++ b/eventstore/mmm/fuzz_test.go
@@ -99,6 +99,16 @@ func FuzzTest(f *testing.F) {
 				count++
 			}
 			require.Equal(t, count, len(storedByLayer[layer.name]), "layer %d ('%s')", i, layer.name)
+
+			// call ComputeStats
+			stats, err := layer.ComputeStats()
+			require.NoError(t, err, "ComputeStats failed for layer %d ('%s')", i, layer.name)
+			require.NotNil(t, stats, "ComputeStats returned nil for layer %d ('%s')", i, layer.name)
+			require.Equal(t, stats.Total, uint(count))
+			if count > 0 {
+				require.GreaterOrEqual(t, len(stats.PerWeek), 1)
+				require.Len(t, stats.PerPubKeyPrefix, 1)
+			}
 		}
 
 		// randomly select n events to delete from random layers
diff --git a/eventstore/mmm/stats.go b/eventstore/mmm/stats.go
new file mode 100644
index 0000000..1845372
--- /dev/null
+++ b/eventstore/mmm/stats.go
@@ -0,0 +1,135 @@
+package mmm
+
+import (
+	"encoding/binary"
+	"time"
+
+	"fiatjaf.com/nostr"
+	"github.com/PowerDNS/lmdb-go/lmdb"
+)
+
+type EventStats struct {
+	Total           uint
+	PerWeek         []uint
+	PerPubKeyPrefix map[string]PubKeyStats
+	PerKind         map[nostr.Kind]KindStats
+}
+
+type KindStats struct {
+	Total   uint
+	PerWeek []uint
+}
+
+type PubKeyStats struct {
+	Total          uint
+	PerWeek        []uint
+	PerKind        map[nostr.Kind]uint
+	PerKindPerWeek map[nostr.Kind][]uint
+}
+
+func (il *IndexingLayer) ComputeStats() (*EventStats, error) {
+	stats := &EventStats{
+		Total:           0,
+		PerWeek:         make([]uint, 0, 24),
+		PerPubKeyPrefix: make(map[string]PubKeyStats, 30),
+		PerKind:         make(map[nostr.Kind]KindStats, 20),
+	}
+
+	err := il.lmdbEnv.View(func(txn *lmdb.Txn) error {
+		cursor, err := txn.OpenCursor(il.indexPubkeyKind)
+		if err != nil {
+			return err
+		}
+		defer cursor.Close()
+
+		for {
+			key, _, err := cursor.Get(nil, nil, lmdb.Next)
+			if lmdb.IsNotFound(err) {
+				break
+			}
+			if err != nil {
+				return err
+			}
+
+			if len(key) < 14 {
+				continue
+			}
+
+			// parse key: [8 bytes pubkey][2 bytes kind][4 bytes timestamp]
+			pubkeyPrefix := nostr.HexEncodeToString(key[0:8])
+			kind := nostr.Kind(binary.BigEndian.Uint16(key[8:10]))
+			createdTime := time.Unix(int64(binary.BigEndian.Uint32(key[10:14])), 0)
+
+			// figure out how many weeks in the past this is
+			weekIndex := weeksInPast(createdTime)
+
+			// update totals
+			stats.Total++
+			if weekIndex >= 0 {
+				for len(stats.PerWeek) <= weekIndex {
+					stats.PerWeek = append(stats.PerWeek, 0)
+				}
+				stats.PerWeek[weekIndex]++
+			}
+			if this, exists := stats.PerPubKeyPrefix[pubkeyPrefix]; exists {
+				this.Total++
+				this.PerKind[kind]++
+				if weekIndex >= 0 {
+					for len(this.PerWeek) <= weekIndex {
+						this.PerWeek = append(this.PerWeek, 0)
+					}
+					this.PerWeek[weekIndex]++
+				}
+				stats.PerPubKeyPrefix[pubkeyPrefix] = this
+			} else {
+				stats.PerPubKeyPrefix[pubkeyPrefix] = PubKeyStats{
+					Total: 1,
+					PerKind: map[nostr.Kind]uint{
+						kind: 1,
+					},
+				}
+			}
+			if this, exists := stats.PerKind[kind]; exists {
+				this.Total++
+				if weekIndex >= 0 {
+					for len(this.PerWeek) <= weekIndex {
+						this.PerWeek = append(this.PerWeek, 0)
+					}
+					this.PerWeek[weekIndex]++
+				}
+				stats.PerKind[kind] = this
+			} else {
+				stats.PerKind[kind] = KindStats{
+					Total: 1,
+				}
+			}
+		}
+
+		return nil
+	})
+
+	return stats, err
+}
+
+func weeksInPast(date time.Time) int {
+	now := time.Now()
+
+	if date.After(now) {
+		// when in the future always return -1
+		return -1
+	}
+
+	lastSaturday := now.AddDate(0, 0, -int(now.Weekday()+1))
+	lastSaturday = time.Date(lastSaturday.Year(), lastSaturday.Month(), lastSaturday.Day(), 23, 59, 59, 0, lastSaturday.Location())
+
+	// if the date is after the last completed Saturday, it's in the current incomplete week
+	if date.After(lastSaturday) {
+		return 0
+	}
+
+	// calculate the number of complete weeks between the date and last saturday
+	daysDiff := int(lastSaturday.Sub(date).Hours() / 24)
+	completeWeeks := (daysDiff / 7) + 1 // +1 because we've already passed at least one Saturday
+
+	return completeWeeks
+}