Bak

playPackets.go

@@ -3,7 +3,11 @@ package main
 import (
 	"bufio"
 	"bytes"
+	"errors"
 	"github.com/Tnze/go-mc/nbt"
+	"github.com/google/uuid"
+	"math/rand/v2"
+	"time"
 )
 
 func (player *Player) sendBundleDelimiter() error {
@@ -356,6 +360,140 @@ func (player *Player) sendPlayStart() error {
 
 }
 
-//func (player *Player) sendMapItemData(mapId int32) error {
+func (player *Player) sendMapItemData(mapId int32) error {
-//	mapEntry := world.m
+	var buf bytes.Buffer
-//}
+	mapEntry, found := world.Maps[mapId]
+	if found {
+		mapEntry.add(&buf)
+	}
+	return player.sendPacket(0x2C, &buf)
+}
+
+func (player *Player) sendMerchantOffers(windowID int32, entity *VillagerEntity) error {
+	var buf bytes.Buffer
+	entity.addOffers(&buf, windowID)
+	return player.sendPacket(0x2D, &buf)
+}
+
+func (player *Player) sendEntityPositionUpdate(entity *Entity, deltas []int16) error {
+	if len(deltas) != 3 {
+		return errors.New("invalid deltas")
+	}
+	var buf bytes.Buffer
+	addVarint(&buf, entity.ID)
+	addInt16(&buf, deltas[0])
+	addInt16(&buf, deltas[1])
+	addInt16(&buf, deltas[2])
+	addBool(&buf, entity.onGround())
+	return player.sendPacket(0x2E, &buf)
+}
+
+func (player *Player) sendEntityPositionRotationUpdate(entity *Entity, deltas []int16) error {
+	if len(deltas) != 3 {
+		return errors.New("invalid deltas")
+	}
+	var buf bytes.Buffer
+	addVarint(&buf, entity.ID)
+	addInt16(&buf, deltas[0])
+	addInt16(&buf, deltas[1])
+	addInt16(&buf, deltas[2])
+	addByte(&buf, entity.Rotation.Yaw)
+	addByte(&buf, entity.Rotation.Pitch)
+	addBool(&buf, entity.onGround())
+	return player.sendPacket(0x2F, &buf)
+}
+
+func (player *Player) sendEntityRotationUpdate(entity *Entity) error {
+	var buf bytes.Buffer
+	addVarint(&buf, entity.ID)
+	addByte(&buf, entity.Rotation.Yaw)
+	addByte(&buf, entity.Rotation.Pitch)
+	addBool(&buf, entity.onGround())
+	return player.sendPacket(0x30, &buf)
+}
+
+func (player *Player) sendVehicleMove() error {
+	if player.Entity.Vehicle != nil {
+		var buf bytes.Buffer
+		player.Entity.Vehicle.Position.add(&buf)
+		addFloat32(&buf, float32(player.Entity.Vehicle.Rotation.Yaw))
+		addFloat32(&buf, float32(player.Entity.Vehicle.Rotation.Pitch))
+		return player.sendPacket(0x31, &buf)
+	}
+	return errors.New("no vehicle")
+}
+
+func (player *Player) sendBookOpen(isOffHand bool) error {
+	var buf bytes.Buffer
+	hand := int32(0)
+	if isOffHand {
+		hand = 1
+	}
+	addVarint(&buf, hand)
+	return player.sendPacket(0x32, &buf)
+}
+
+func (player *Player) sendOpenScreen(windowID int32, window *Window, title TextComponent) error {
+	var buf bytes.Buffer
+	addVarint(&buf, windowID)
+	addVarint(&buf, window.ID)
+	addTextComponent(&buf, title)
+	return player.sendPacket(0x33, &buf)
+}
+
+func (player *Player) sendOpenSignEditor(blockPosition BlockPosition, front bool) error {
+	var buf bytes.Buffer
+	blockPosition.add(&buf)
+	addBool(&buf, front)
+	return player.sendPacket(0x34, &buf)
+}
+
+//0x35 is ping to client
+//0x36 is pong
+
+func (player *Player) sendGhostRecipe(windowID uint8, recipe string) error {
+	var buf bytes.Buffer
+	addByte(&buf, windowID)
+	addString(&buf, recipe)
+	return player.sendPacket(0x37, &buf)
+}
+
+func (player *Player) sendAbilities() error {
+	var buf bytes.Buffer
+	addByte(&buf, player.Abilites.export())
+	addFloat32(&buf, player.FlyingSpeed)
+	addFloat32(&buf, player.FOVModifier)
+	return player.sendPacket(0x38, &buf)
+}
+
+func (player *Player) sendChatMessage(sender *Player, message string) error {
+	var buf bytes.Buffer
+	//TODO IMPLEMENT
+	addUUID(&buf, sender.uuid)
+	addVarint(&buf, sender.MessageIndex)
+	addBool(&buf, false)
+	addString(&buf, message)
+	addInt64(&buf, time.Now().Unix())
+	addInt64(&buf, rand.Int64())
+	//not implementing secure chat
+	return player.sendPacket(0x39, &buf)
+}
+
+func (player *Player) sendDeath(message TextComponent) error {
+	var buf bytes.Buffer
+	addVarint(&buf, player.Entity.ID)
+	addTextComponent(&buf, message)
+	return player.sendPacket(0x3C, &buf)
+}
+
+func (player *Player) sendRemoveFromTab(playersToRemove []uuid.UUID) error {
+	if len(playersToRemove) > 0 {
+		var buf bytes.Buffer
+		addVarint(&buf, int32(len(playersToRemove)))
+		for _, playerToRemove := range playersToRemove {
+			addUUID(&buf, playerToRemove)
+		}
+		return player.sendPacket(0x3D, &buf)
+	}
+	return errors.New("no playersToRemove")
+}

structs.go

@@ -8,6 +8,7 @@ import (
 	"github.com/google/uuid"
 	"math"
 	"net"
+	"time"
 )
 
 type Version struct {
@@ -38,6 +39,29 @@ type ServerStatus struct {
 	EnforcesSecureChat bool        `json:"enforcesSecureChat"`
 }
 
+type PlayerAbilites struct {
+	Invulnerable bool
+	Flying       bool
+	AllowFlying  bool
+	CreativeMode bool
+}
+
+func (abilities *PlayerAbilites) export() (out byte) {
+	if abilities.Invulnerable {
+		out |= 0x01
+	}
+	if abilities.Flying {
+		out |= 0x02
+	}
+	if abilities.AllowFlying {
+		out |= 0x04
+	}
+	if abilities.CreativeMode {
+		out |= 0x08
+	}
+	return
+}
+
 type Player struct {
 	conn net.Conn
 
@@ -59,6 +83,14 @@ type Player struct {
 	DeathDimension       *Dimension
 	DeathPosition        BlockPosition
 
+	Abilites     PlayerAbilites
+	FlyingSpeed  float32
+	FOVModifier  float32
+	MessageIndex int32
+
+	CombatStart int64
+	CombatEnd   int64
+
 	Position EntityPosition
 
 	GameMode         uint8
@@ -88,6 +120,21 @@ type Player struct {
 	uuid uuid.UUID
 }
 
+func (player *Player) startCombat() {
+	player.CombatStart = time.Now().Unix()
+	_ = player.sendPacket(0x3B, &bytes.Buffer{})
+}
+
+func (player *Player) endCombat() {
+	player.CombatEnd = time.Now().Unix()
+	length := player.CombatEnd - player.CombatStart
+	if length >= 0 && player.CombatEnd != 0 && player.CombatStart != 0 && player.CombatEnd > player.CombatStart {
+		var buf bytes.Buffer
+		addInt64(&buf, length)
+		_ = player.sendPacket(0x3A, &buf)
+	}
+}
+
 type Dimension struct {
 	ID   int32
 	Name string
@@ -370,6 +417,21 @@ func (slot *Slot) add(buf *bytes.Buffer) {
 	}
 }
 
+func (slot *Slot) addTrade(buf *bytes.Buffer) {
+	addVarint(buf, slot.Count)
+	if slot.Count > 0 {
+		addVarint(buf, slot.ItemID)
+		addVarint(buf, int32(len(slot.ComponentsToAdd)))
+		for componentID, component := range slot.ComponentsToAdd {
+			addVarint(buf, componentID)
+			component = component //TODO IMPLEMENT ALL THESE STUPID COMPONENTS
+		}
+		for _, componentID := range slot.ComponentsToRemove {
+			addVarint(buf, componentID)
+		}
+	}
+}
+
 // PalettedContainer represents a palette-based storage of entries.
 type PalettedContainer struct {
 	BitsPerEntry uint8
@@ -621,16 +683,62 @@ func (velocity *Velocity) add(buf *bytes.Buffer) {
 }
 
 type Entity struct {
-	ID             int32
+	World           *World
-	UUID           uuid.UUID
+	ID              int32
-	Type           int32
+	UUID            uuid.UUID
-	Position       EntityPosition
+	Type            int32
-	Rotation       EntityRotation
+	Position        EntityPosition
-	Data           int32
+	Rotation        EntityRotation
-	Velocity       Velocity
+	Data            int32
-	Animation      uint8
+	Velocity        Velocity
-	status         int8
+	Animation       uint8
-	PortalCooldown int32
+	status          int8
+	PortalCooldown  int32
+	Vehicle         *Entity
+	PlayersInformed []*Player
+}
+
+// Function to calculate the Euclidean distance between two points in 3D space
+func distance(p1, p2 EntityPosition) float64 {
+	dx := p2.X - p1.X
+	dy := p2.Y - p1.Y
+	dz := p2.Z - p1.Z
+	return math.Sqrt(dx*dx + dy*dy + dz*dz)
+}
+
+func getDeltas(p1, p2 EntityPosition) []int16 {
+	return []int16{
+		int16((p2.X * 4096) - (p1.X * 4096)),
+		int16((p2.Y * 4096) - (p1.Y * 4096)),
+		int16((p2.Z * 4096) - (p1.Z * 4096)),
+	}
+}
+
+func (entity *Entity) move(newPos EntityPosition, withRotation bool) {
+	diff := distance(entity.Position, newPos)
+	if diff <= 7 {
+		if withRotation {
+			for _, player := range entity.PlayersInformed {
+				player.sendEntityPositionRotationUpdate(entity, getDeltas(entity.Position, newPos))
+			}
+		} else {
+			for _, player := range entity.PlayersInformed {
+				player.sendEntityPositionUpdate(entity, getDeltas(entity.Position, newPos))
+			}
+		}
+	} else {
+		for _, player := range entity.PlayersInformed {
+			//TODO make entity teleport
+			player = player
+			//player.sendEntityTeleport(entity, newPos)
+		}
+	}
+	entity.Position = newPos
+}
+
+func (entity *Entity) onGround() bool {
+	//TODO ADD THIS
+	return true
 }
 
 func (entity *Entity) add(buf *bytes.Buffer) {
@@ -714,3 +822,54 @@ func (Map *Map) add(buf *bytes.Buffer) {
 		}
 	}
 }
+
+type VillageTrade struct {
+	In1        Slot
+	In2        *Slot
+	Out        Slot
+	Disabled   bool
+	Uses       int32
+	MaxUses    int32
+	XP         int32
+	Modifier   int32
+	Multiplier float32
+	Demand     int32
+}
+
+func (villageTrade *VillageTrade) add(buf *bytes.Buffer) {
+	villageTrade.In1.addTrade(buf)
+	villageTrade.Out.add(buf)
+	villageTrade.In2.addTrade(buf)
+	addBool(buf, villageTrade.Disabled)
+	addInt32(buf, villageTrade.Uses)
+	addInt32(buf, villageTrade.MaxUses)
+	addInt32(buf, villageTrade.XP)
+	addInt32(buf, villageTrade.Modifier)
+	addFloat32(buf, villageTrade.Multiplier)
+	addInt32(buf, villageTrade.Demand)
+}
+
+type VillagerEntity struct {
+	Entity     *Entity
+	Trades     []VillageTrade
+	Level      int32
+	XP         int32
+	Wandering  bool
+	CanRestock bool
+}
+
+func (VillagerEntity *VillagerEntity) addOffers(buf *bytes.Buffer, windowID int32) {
+	addVarint(buf, windowID)
+	addVarint(buf, int32(len(VillagerEntity.Trades)))
+	for _, trade := range VillagerEntity.Trades {
+		trade.add(buf)
+	}
+	addVarint(buf, VillagerEntity.Level)
+	addVarint(buf, VillagerEntity.XP)
+	addBool(buf, !VillagerEntity.Wandering)
+	addBool(buf, VillagerEntity.CanRestock)
+}
+
+type Window struct {
+	ID int32
+}