Draft: feat login

implements/bunDatabase.go

@@ -0,0 +1,39 @@
+package implements
+
+import (
+	"context"
+
+	"gitea.konchin.com/ytshih/inp2025/game/models"
+	"gitea.konchin.com/ytshih/inp2025/game/types"
+	"github.com/uptrace/bun"
+)
+
+type BunDatabase struct {
+	db *bun.DB
+}
+
+func NewBunDatabase(bunDB *bun.DB) *BunDatabase {
+	return &BunDatabase{db: bunDB}
+}
+
+func (self *BunDatabase) InsertUser(
+	ctx context.Context,
+	user models.User,
+) error {
+	res, err := self.db.NewInsert().
+		Model(&user).
+		On("CONFLICT (username) DO NOTHING").
+		Exec(ctx)
+	if err != nil {
+		return err
+	}
+	if cnt, err := res.RowsAffected(); err != nil || cnt == 0 {
+		if err != nil {
+			return err
+		}
+		if cnt == 0 {
+			return types.UsernameConflictError
+		}
+	}
+	return nil
+}