mojang cant get their cases straight

i had to implement like 4 cases just  to parse that file

level/anvil/level.go

@@ -7,18 +7,179 @@ import (
 )
 
 type Level struct {
-	DataPacks struct {
-		Enabled  []string
-		Disabled []string
-	}
+	ClearWeatherTime           int32 `nbt:"clearWeatherTime"`
+	DataPacks                  DataPacks
+	DayTime                    int64
+	WanderingTraderSpawnChance int32
+	GameType                   int32
+	WorldGenSettings           WorldGenSettings
+	ScheduledEvents            []interface{}
+	WasModded                  bool
+	ThunderTime                int32 `nbt:"thunderTime"`
+	Difficulty                 int8
+	DragonFight                DragonFight
+	Initialized                bool
+	AllowCommands              bool `nbt:"allowCommands"`
+	Thundering                 bool
+	LastPlayed                 int64
+	GameRules                  map[string]interface{}
+	RainTime                   int32 `nbt:"rainTime"`
+	DataVersion                int32
+	Version                    Version
+	WanderingTraderSpawnDelay  int32
+	Hardcore                   bool
+	Spawn                      Spawn
+	Raining                    bool
+	Player                     Player
+	DifficultyLocked           bool
+	LevelName                  string
+	Time                       int64
+	ServerBrands               []string
+	CustomBossEvents           map[string]interface{}
+}
+
+type DataPacks struct {
+	Enabled  []string
+	Disabled []string
+}
+
+type WorldGenSettings struct {
+	BonusChest       bool
+	Seed             int64
+	GenerateFeatures bool
+	Dimensions       map[string]Dimension
+}
+
+type Dimensions struct {
+	Overworld Dimension
+	Nether    Dimension
+	End       Dimension
+}
+
+type Dimension struct {
+	Generator Generator
+	Type      string
+}
+
+type Generator struct {
+	Type        string
+	Settings    string
+	BiomeSource BiomeSource
+}
+
+type BiomeSource struct {
+	Preset string `nbt:"preset,omitempty"`
+	Type   string
+}
+
+type DragonFight struct {
+	NeedsStateScanning bool
+	Gateways           []int32
+	DragonKilled       bool
+	PreviouslyKilled   bool
+}
+
+type Version struct {
+	Snapshot bool
+	Series   string
+	Id       int32
+	Name     string
+}
+
+type Spawn struct {
+	Dimension string
+	Yaw       float32
+	Pos       [3]int32
+	Pitch     float32
+}
+
+type Player struct {
+	XpLevel                              int32
+	HurtTime                             int16
+	DeathTime                            int16
+	XpTotal                              int32
+	FoodExhaustionLevel                  float32
+	RecipeBook                           RecipeBook
+	Fire                                 int16
+	Brain                                Brain
+	XpSeed                               int32
+	XpP                                  float32
+	EnderItems                           []interface{}
+	Invulnerable                         bool
+	Pos                                  [3]float64
+	Inventory                            []InventoryItem
+	SleepTimer                           int16
+	Abilities                            Abilities
+	PlayerGameType                       int32
+	SeenCredits                          bool
+	FoodSaturationLevel                  float32
+	FallDistance                         float64
+	OnGround                             bool
+	Dimension                            string
+	PortalCooldown                       int32
+	Motion                               [3]float64
+	IgnoreFallDamageFromCurrentExplosion bool
+	Rotation                             [2]float32
+	CurrentImpulseContextResetGraceTime  int32
+	WardenSpawnTracker                   WardenSpawnTracker
+	PreviousPlayerGameType               int32
+	Attributes                           []Attribute
+	HurtByTimestamp                      int32
+	UUID                                 [4]int32
+	Score                                int32
+	DataVersion                          int32
+	FoodLevel                            int32
+	SpawnExtraParticlesOnFall            bool
+	SelectedItemSlot                     int32
+	FoodTickTimer                        int32
+	FallFlying                           bool
+	AbsorptionAmount                     float32
+	Health                               float32
+	Air                                  int16
+}
+
+type RecipeBook struct {
+	Recipes       []string
+	ToBeDisplayed []string
+}
+
+type Brain struct {
+	Memories map[string]interface{}
+}
+
+type InventoryItem struct {
+	Count int32
+	Slot  int8
+	Id    string
+}
+
+type Abilities struct {
+	Invulnerable bool
+	Mayfly       bool
+	Instabuild   bool
+	WalkSpeed    float32
+	MayBuild     bool
+	Flying       bool
+	FlySpeed     float32
+}
+
+type WardenSpawnTracker struct {
+	WarningLevel          int32
+	TicksSinceLastWarning int32
+	CooldownTicks         int32
+}
+
+type Attribute struct {
+	Id   string
+	Base float64
 }
 
 func ReadLevelData(r io.Reader) (l Level, err error) {
-	var lDtatWrapped struct{ Data Level }
-	err = nbt.ReadFile(r, &lDtatWrapped)
+	var lDataWrapped struct{ Data Level }
+	err = nbt.ReadFile(r, &lDataWrapped)
 	if err != nil {
 		return
 	}
-	l = lDtatWrapped.Data
+	l = lDataWrapped.Data
 	return
 }