feat: add daily challenge record storage and leaderboard

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

store/daily.go

@@ -0,0 +1,81 @@
+package store
+
+import (
+	"encoding/json"
+	"sort"
+	"time"
+
+	bolt "go.etcd.io/bbolt"
+)
+
+var bucketDailyRuns = []byte("daily_runs")
+
+type DailyRecord struct {
+	Date         string `json:"date"`
+	Player       string `json:"player"`
+	PlayerName   string `json:"player_name"`
+	FloorReached int    `json:"floor_reached"`
+	GoldEarned   int    `json:"gold_earned"`
+}
+
+func (d *DB) SaveDaily(record DailyRecord) error {
+	return d.db.Update(func(tx *bolt.Tx) error {
+		b := tx.Bucket(bucketDailyRuns)
+		key := []byte(record.Date + ":" + record.Player)
+		data, err := json.Marshal(record)
+		if err != nil {
+			return err
+		}
+		return b.Put(key, data)
+	})
+}
+
+func (d *DB) GetDailyLeaderboard(date string, limit int) ([]DailyRecord, error) {
+	var records []DailyRecord
+	prefix := []byte(date + ":")
+	err := d.db.View(func(tx *bolt.Tx) error {
+		b := tx.Bucket(bucketDailyRuns)
+		c := b.Cursor()
+		for k, v := c.Seek(prefix); k != nil && len(k) >= len(prefix) && string(k[:len(prefix)]) == string(prefix); k, v = c.Next() {
+			var r DailyRecord
+			if json.Unmarshal(v, &r) == nil {
+				records = append(records, r)
+			}
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	sort.Slice(records, func(i, j int) bool {
+		if records[i].FloorReached != records[j].FloorReached {
+			return records[i].FloorReached > records[j].FloorReached
+		}
+		return records[i].GoldEarned > records[j].GoldEarned
+	})
+	if len(records) > limit {
+		records = records[:limit]
+	}
+	return records, nil
+}
+
+func (d *DB) GetStreak(fingerprint, currentDate string) (int, error) {
+	streak := 0
+	date, err := time.Parse("2006-01-02", currentDate)
+	if err != nil {
+		return 0, err
+	}
+	err = d.db.View(func(tx *bolt.Tx) error {
+		b := tx.Bucket(bucketDailyRuns)
+		for {
+			key := []byte(date.Format("2006-01-02") + ":" + fingerprint)
+			if b.Get(key) == nil {
+				break
+			}
+			streak++
+			date = date.AddDate(0, 0, -1)
+		}
+		return nil
+	})
+	return streak, err
+}

store/daily_test.go

@@ -0,0 +1,66 @@
+package store
+
+import (
+	"testing"
+)
+
+func TestSaveAndGetDaily(t *testing.T) {
+	dir := t.TempDir()
+	db, err := Open(dir + "/test_daily.db")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	db.SaveDaily(DailyRecord{Date: "2026-03-25", Player: "fp1", PlayerName: "Alice", FloorReached: 10, GoldEarned: 200})
+	db.SaveDaily(DailyRecord{Date: "2026-03-25", Player: "fp2", PlayerName: "Bob", FloorReached: 15, GoldEarned: 100})
+	db.SaveDaily(DailyRecord{Date: "2026-03-25", Player: "fp3", PlayerName: "Charlie", FloorReached: 15, GoldEarned: 300})
+
+	records, err := db.GetDailyLeaderboard("2026-03-25", 10)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(records) != 3 {
+		t.Fatalf("expected 3 records, got %d", len(records))
+	}
+	// Charlie and Bob both floor 15, Charlie has more gold so first
+	if records[0].PlayerName != "Charlie" {
+		t.Errorf("expected Charlie first, got %s", records[0].PlayerName)
+	}
+	if records[1].PlayerName != "Bob" {
+		t.Errorf("expected Bob second, got %s", records[1].PlayerName)
+	}
+	if records[2].PlayerName != "Alice" {
+		t.Errorf("expected Alice third, got %s", records[2].PlayerName)
+	}
+}
+
+func TestDailyStreak(t *testing.T) {
+	dir := t.TempDir()
+	db, err := Open(dir + "/test_streak.db")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	db.SaveDaily(DailyRecord{Date: "2026-03-23", Player: "fp1", PlayerName: "Alice", FloorReached: 5, GoldEarned: 50})
+	db.SaveDaily(DailyRecord{Date: "2026-03-24", Player: "fp1", PlayerName: "Alice", FloorReached: 8, GoldEarned: 100})
+	db.SaveDaily(DailyRecord{Date: "2026-03-25", Player: "fp1", PlayerName: "Alice", FloorReached: 10, GoldEarned: 200})
+
+	streak, err := db.GetStreak("fp1", "2026-03-25")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if streak != 3 {
+		t.Errorf("expected streak 3, got %d", streak)
+	}
+
+	// Gap in streak
+	streak2, err := db.GetStreak("fp1", "2026-03-27")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if streak2 != 0 {
+		t.Errorf("expected streak 0 after gap, got %d", streak2)
+	}
+}

store/db.go

@@ -39,6 +39,18 @@ func Open(path string) (*DB, error) {
 		if _, err := tx.CreateBucketIfNotExists(bucketAchievements); err != nil {
 			return err
 		}
+		if _, err := tx.CreateBucketIfNotExists(bucketDailyRuns); err != nil {
+			return err
+		}
+		if _, err := tx.CreateBucketIfNotExists(bucketUnlocks); err != nil {
+			return err
+		}
+		if _, err := tx.CreateBucketIfNotExists(bucketTitles); err != nil {
+			return err
+		}
+		if _, err := tx.CreateBucketIfNotExists(bucketCodex); err != nil {
+			return err
+		}
 		return nil
 	})
 	return &DB{db: db}, err