From e6fa98f70719563b3c5e6fac270e3aabb51efe11 Mon Sep 17 00:00:00 2001
From: Branden J Brown <zephyrtronium@gmail.com>
Date: Wed, 6 May 2026 16:24:34 -0400
Subject: [PATCH] initial commit

---
 go.mod              |   3 +
 umadump-gametora.go | 165 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 168 insertions(+)
 create mode 100644 go.mod
 create mode 100644 umadump-gametora.go

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..48fef60
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.sunturtle.xyz/zephyr/umadump-gametora
+
+go 1.25.6
diff --git a/umadump-gametora.go b/umadump-gametora.go
new file mode 100644
index 0000000..610a7c4
--- /dev/null
+++ b/umadump-gametora.go
@@ -0,0 +1,165 @@
+package main
+
+import (
+	"cmp"
+	"context"
+	"encoding/json"
+	"flag"
+	"io"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"time"
+)
+
+type DumpCard struct {
+	ID         int `json:"card_id"`
+	Level      int `json:"talent_level"`
+	Rarity     int `json:"rarity"`
+	CreateTime int `json:"create_time"`
+}
+
+type DumpSupport struct {
+	ID           int  `json:"supportCardId"`
+	Level        int  `json:"level"`
+	LB           int  `json:"limitBreakCount"`
+	MaxLevel     int  `json:"maxLevel"`
+	CreateTime   int  `json:"createTime"`
+	Exp          int  `json:"exp"`
+	Stock        int  `json:"stock"`
+	Favorite     bool `json:"isFavoriteLock"`
+	BestTraining int  `json:"bestTraining"`
+}
+
+type Collection struct {
+	App       string                      `json:"app"`       // "gametora"
+	Game      string                      `json:"game"`      // "umamusume"
+	Type      string                      `json:"type"`      // "collection"
+	Version   int                         `json:"version"`   // 4
+	Timestamp string                      `json:"timestamp"` // time.Now().String()
+	Servers   map[string]CollectionServer `json:"servers"`
+}
+
+type CollectionServer struct {
+	CharCards map[string]int `json:"charCards"`
+	Supports  map[string]int `json:"supports"`
+	Veterans  struct{}       `json:"-"` // `json:"veterans"`
+}
+
+type Localize struct {
+	CardID    int    `json:"card_id"` // character card, or trainee
+	SupportID int    `json:"id"`      // support card
+	TID       string `json:"tid"`
+	// many other fields we don't need
+}
+
+func decode[T any](r io.Reader) ([]T, error) {
+	var l []T
+	d := json.NewDecoder(r)
+	err := d.Decode(&l)
+	return l, err
+}
+
+func tidMap(ctx context.Context, url string) (map[int]string, error) {
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	l, err := decode[Localize](resp.Body)
+	m := make(map[int]string, len(l))
+	for _, v := range l {
+		m[cmp.Or(v.CardID, v.SupportID)] = v.TID
+	}
+	return m, err
+}
+
+func filejson[T any](path string) ([]T, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	return decode[T](f)
+}
+
+func main() {
+	var (
+		dumpDir string
+		out     string
+	)
+	flag.StringVar(&dumpDir, "dump", ".", "`dir`ectory containing umadump output files")
+	flag.StringVar(&out, "o", "", "output `file` (default stdout)")
+	flag.Parse()
+
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
+	go func() {
+		<-ctx.Done()
+		stop()
+	}()
+
+	var err error
+	w := os.Stdout
+	if out != "" {
+		w, err = os.Create(out)
+		if err != nil {
+			fatal("output", slog.Any("err", err))
+		}
+	}
+
+	charas, err := filejson[DumpCard](filepath.Join(dumpDir, "card_data.json"))
+	if err != nil {
+		fatal("character dump", slog.Any("err", err))
+	}
+	supports, err := filejson[DumpSupport](filepath.Join(dumpDir, "support_card_data.json"))
+	if err != nil {
+		fatal("support card dump", slog.Any("err", err))
+	}
+	charaTID, err := tidMap(ctx, "https://gametora.com/loc/umamusume/character_cards.json")
+	if err != nil {
+		fatal("character localization file", slog.Any("err", err))
+	}
+	supportTID, err := tidMap(ctx, "https://gametora.com/loc/umamusume/support_cards.json")
+	if err != nil {
+		fatal("support card localization file", slog.Any("err", err))
+	}
+
+	charaLevels := make(map[string]int, len(charas))
+	for _, v := range charas {
+		charaLevels[charaTID[v.ID]] = v.Rarity
+	}
+	supportLevels := make(map[string]int, len(supports))
+	for _, v := range supports {
+		supportLevels[supportTID[v.ID]] = v.LB
+	}
+
+	collection := Collection{
+		App:       "gametora",
+		Game:      "umamusume",
+		Type:      "collection",
+		Version:   4,
+		Timestamp: time.Now().String(),
+		Servers: map[string]CollectionServer{
+			"en": {
+				CharCards: charaLevels,
+				Supports:  supportLevels,
+			},
+		},
+	}
+	b, err := json.Marshal(collection)
+	if err != nil {
+		panic(err)
+	}
+	if _, err := w.Write(b); err != nil {
+		fatal("writing output", slog.Any("err", err))
+	}
+}
+
+func fatal(msg string, args ...any) {
+	slog.Error(msg, args...)
+	os.Exit(1)
+}