cmd: upgrade group

internal/controller/generate.go

@@ -57,13 +57,15 @@ func buildGameOnMap(races []string, m generator.Map) (*game.Game, error) {
 		}
 		relations[i] = game.RaceRelation{RaceID: raceID, Relation: game.RelationWar}
 		g.Race[i] = game.Race{
-			ID:      raceID,
-			Name:    races[i],
-			Vote:    raceID,
-			Drive:   1,
-			Weapons: 1,
-			Shields: 1,
-			Cargo:   1,
+			ID:   raceID,
+			Name: races[i],
+			Vote: raceID,
+			Tech: map[game.Tech]float64{
+				game.TechDrive:   1,
+				game.TechWeapons: 1,
+				game.TechShields: 1,
+				game.TechCargo:   1,
+			},
 		}
 		gameMap.Planet = append(gameMap.Planet, NewPlanet(
 			planetCount,
@@ -125,7 +127,7 @@ func buildGameOnMap(races []string, m generator.Map) (*game.Game, error) {
 	return g, nil
 }
 
-func NewPlanet(num uint, name string, owner uuid.UUID, x, y, size, pop, ind, res float64, prod game.ProductionType) game.Planet {
+func NewPlanet(num uint, name string, owner uuid.UUID, x, y, size, pop, ind, res float64, prod game.Production) game.Planet {
 	return game.Planet{
 		Owner: owner,
 		PlanetReport: game.PlanetReport{

internal/error/generic.go

@@ -20,6 +20,8 @@ const (
 	ErrShipsBusy                      = 5007
 	ErrShipsNotOnSamePlanet           = 5008
 	ErrGiveawayGroupShipsTypeNotEqual = 5009
+	ErrUpgradeGroupNumberNotEnough    = 5010
+	ErrUpgradeInsufficientResources   = 5011
 )
 
 const (
@@ -49,6 +51,13 @@ const (
 	ErrInputCargoUnloadEmpty
 	ErrInputCargoUnoadNotEnough
 	ErrInputBreakGroupIllegalNumber
+	ErrInputTechUnknown
+	ErrInputTechInvalidMixing
+	ErrInputUpgradeShipTechNotUsed
+	ErrInputUpgradeParameterNotAllowed
+	ErrInputUpgradeShipsAlreadyUpToDate
+	ErrInputUpgradeGroupBreakNotAllowed
+	ErrInputUpgradeTechLevelInsufficient
 )
 
 func GenericErrorText(code int) string {
@@ -131,6 +140,24 @@ func GenericErrorText(code int) string {
 		return "Ships not on the same planet"
 	case ErrGiveawayGroupShipsTypeNotEqual:
 		return "Ship type already defined with different specifications"
+	case ErrInputTechUnknown:
+		return "Technology name unknown"
+	case ErrInputTechInvalidMixing:
+		return "Technologies list must containt only specific values"
+	case ErrInputUpgradeShipTechNotUsed:
+		return "Technology is not used with ship class"
+	case ErrInputUpgradeParameterNotAllowed:
+		return "Parameter not allowed for upgrade"
+	case ErrInputUpgradeShipsAlreadyUpToDate:
+		return "Ships already up to date, nothing to upgrade"
+	case ErrUpgradeGroupNumberNotEnough:
+		return "Not enough ships in the group to make an upgrade"
+	case ErrUpgradeInsufficientResources:
+		return "Insufficient planet production capacity"
+	case ErrInputUpgradeGroupBreakNotAllowed:
+		return "The Group is already in upgrade state and can't be divided to a smaller group"
+	case ErrInputUpgradeTechLevelInsufficient:
+		return "Insifficient Tech level for requested upgrade"
 	default:
 		return fmt.Sprintf("Undescribed error with code %d", code)
 	}

internal/error/input.go

@@ -131,3 +131,39 @@ func NewShipsNotOnSamePlanetError(arg ...any) error {
 func NewGiveawayGroupShipsTypeNotEqualError(arg ...any) error {
 	return newGenericError(ErrGiveawayGroupShipsTypeNotEqual, arg...)
 }
+
+func NewTechUnknownError(arg ...any) error {
+	return newGenericError(ErrInputTechUnknown, arg...)
+}
+
+func NewTechInvalidMixingError(arg ...any) error {
+	return newGenericError(ErrInputTechInvalidMixing, arg...)
+}
+
+func NewUpgradeShipTechNotUsedError(arg ...any) error {
+	return newGenericError(ErrInputUpgradeShipTechNotUsed, arg...)
+}
+
+func NewUpgradeParameterNotAllowedError(arg ...any) error {
+	return newGenericError(ErrInputUpgradeParameterNotAllowed, arg...)
+}
+
+func NewUpgradeShipsAlreadyUpToDateError(arg ...any) error {
+	return newGenericError(ErrInputUpgradeShipsAlreadyUpToDate, arg...)
+}
+
+func NewUpgradeGroupNumberNotEnoughError(arg ...any) error {
+	return newGenericError(ErrUpgradeGroupNumberNotEnough, arg...)
+}
+
+func NewUpgradeInsufficientResourcesError(arg ...any) error {
+	return newGenericError(ErrUpgradeInsufficientResources, arg...)
+}
+
+func NewUpgradeGroupBreakNotAllowedError(arg ...any) error {
+	return newGenericError(ErrInputUpgradeGroupBreakNotAllowed, arg...)
+}
+
+func NewUpgradeTechLevelInsufficientError(arg ...any) error {
+	return newGenericError(ErrInputUpgradeTechLevelInsufficient, arg...)
+}

internal/model/game/fleet.go

@@ -70,7 +70,7 @@ func (g *Game) joinShipGroupToFleetInternal(ri int, fleetName string, group, cou
 		return e.NewEntityNotExistsError("group #%d", group)
 	}
 
-	if g.ShipGroups[sgi].State != "In_Orbit" || g.ShipGroups[sgi].Origin != nil || g.ShipGroups[sgi].Range != nil {
+	if g.ShipGroups[sgi].State() != StateInOrbit {
 		return e.NewShipsBusyError()
 	}
 

internal/model/game/fleet_test.go

@@ -5,11 +5,12 @@ import (
 	"testing"
 
 	e "github.com/iliadenisov/galaxy/internal/error"
+	"github.com/iliadenisov/galaxy/internal/model/game"
 	"github.com/stretchr/testify/assert"
 )
 
 func TestJoinShipGroupToFleet(t *testing.T) {
-	g := copyGame()
+	g := newGame()
 	var groupIndex uint = 1
 
 	assert.ErrorContains(t,
@@ -85,11 +86,14 @@ func TestJoinShipGroupToFleet(t *testing.T) {
 	// group not In_Orbit
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Gunship, R0_Planet_0_num, 7))
 	gi = 3
-	g.ShipGroups[gi].State = "In_Space"
+	g.ShipGroups[gi].StateInSpace = &game.InSpace{
+		Origin: 2,
+		Range:  1,
+	}
 	assert.ErrorContains(t,
 		g.JoinShipGroupToFleet(Race_0.Name, fleetOne, g.ShipGroups[gi].Index, 0),
 		e.GenericErrorText(e.ErrShipsBusy))
-	g.ShipGroups[gi].State = "In_Orbit"
+	g.ShipGroups[gi].StateInSpace = nil
 
 	// existing fleet not on the same planet or in_orbit
 	g.Fleets[0].Destination = R0_Planet_2_num
@@ -100,7 +104,7 @@ func TestJoinShipGroupToFleet(t *testing.T) {
 }
 
 func TestJoinFleets(t *testing.T) {
-	g := copyGame()
+	g := newGame()
 	// creating ShipGroup at Planet_0
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 1)) // group #1
 	// creating ShipGroup at Planet_2

internal/model/game/game.go

@@ -2,6 +2,9 @@ package game
 
 import (
 	"encoding/json"
+	"fmt"
+	"iter"
+	"maps"
 	"slices"
 	"strings"
 
@@ -9,6 +12,22 @@ import (
 	e "github.com/iliadenisov/galaxy/internal/error"
 )
 
+type TechSet map[Tech]float64
+
+func (ts TechSet) Value(t Tech) float64 {
+	if v, ok := ts[t]; ok {
+		return v
+	} else {
+		panic(fmt.Sprintf("TechSet: Value: %s's value not set", t.String()))
+	}
+}
+
+func (ts TechSet) Set(t Tech, v float64) TechSet {
+	m := maps.Clone(ts)
+	m[t] = v
+	return m
+}
+
 type Game struct {
 	ID         uuid.UUID   `json:"id"`
 	Age        uint        `json:"turn"` // Game's turn number
@@ -29,6 +48,26 @@ func (g Game) Votes(raceID uuid.UUID) float64 {
 	return pop / 1000.
 }
 
+func (g Game) PlanetByNumber(number uint) (Planet, error) {
+	pi := slices.IndexFunc(g.Map.Planet, func(p Planet) bool { return p.Number == number })
+	if pi < 0 {
+		return Planet{}, e.NewGameStateError("PlanetByNumber: planet with number=%d not found", number)
+	}
+	return g.Map.Planet[pi], nil
+}
+
+func (g Game) ShipsInUpgrade(planetNumber uint) iter.Seq[ShipGroup] {
+	return func(yield func(ShipGroup) bool) {
+		for sg := range g.ShipGroups {
+			if g.ShipGroups[sg].Destination == planetNumber && g.ShipGroups[sg].State() == StateUpgrade {
+				if !yield(g.ShipGroups[sg]) {
+					break
+				}
+			}
+		}
+	}
+}
+
 func (g Game) raceIndex(name string) (int, error) {
 	i := slices.IndexFunc(g.Race, func(r Race) bool { return r.Name == name })
 	if i < 0 {

internal/model/game/game_test.go

@@ -10,37 +10,26 @@ import (
 
 var (
 	Race_0 = game.Race{
-		ID:      uuid.New(),
-		Name:    "Race_0",
-		Drive:   1.1,
-		Weapons: 1.2,
-		Shields: 1.3,
-		Cargo:   1.4,
+		ID:   uuid.New(),
+		Name: "Race_0",
+		Tech: map[game.Tech]float64{
+			game.TechDrive:   1.1,
+			game.TechWeapons: 1.2,
+			game.TechShields: 1.3,
+			game.TechCargo:   1.4,
+		},
 	}
 	Race_1 = game.Race{
-		ID:      uuid.New(),
-		Name:    "Race_1",
-		Drive:   2.1,
-		Weapons: 2.2,
-		Shields: 2.3,
-		Cargo:   2.4,
-	}
-	Map = game.Map{
-		Width:  10,
-		Height: 10,
-		Planet: []game.Planet{
-			controller.NewPlanet(R0_Planet_0_num, "Planet_0", Race_0.ID, 0, 0, 100, 0, 0, 0, game.ProductionNone.AsType(uuid.Nil)),
-			controller.NewPlanet(R1_Planet_1_num, "Planet_1", Race_1.ID, 1, 1, 100, 0, 0, 0, game.ProductionNone.AsType(uuid.Nil)),
-			controller.NewPlanet(R0_Planet_2_num, "Planet_2", Race_0.ID, 2, 2, 100, 0, 0, 0, game.ProductionNone.AsType(uuid.Nil)),
+		ID:   uuid.New(),
+		Name: "Race_1",
+		Tech: map[game.Tech]float64{
+			game.TechDrive:   2.1,
+			game.TechWeapons: 2.2,
+			game.TechShields: 2.3,
+			game.TechCargo:   2.4,
 		},
 	}
-	Game = &game.Game{
-		Race: []game.Race{
-			Race_0,
-			Race_1,
-		},
-		Map: Map,
-	}
+
 	Race_0_idx                = 0
 	Race_0_Gunship            = "R0_Gunship"
 	Race_0_Freighter          = "R0_Freighter"
@@ -59,25 +48,47 @@ var (
 	Race_1_Cruiser_idx        = 2
 
 	ShipType_Cruiser = "Cruiser"
+
+	Cruiser = game.ShipType{
+		ShipTypeReport: game.ShipTypeReport{
+			Name:     "Cruiser",
+			Drive:    15,
+			Armament: 1,
+			Weapons:  15,
+			Shields:  15,
+			Cargo:    0,
+		},
+	}
 )
 
-func init() {
-	assertNoError(Game.CreateShipType(Race_0.Name, Race_0_Gunship, 60, 30, 100, 0, 3))
-	assertNoError(Game.CreateShipType(Race_0.Name, Race_0_Freighter, 8, 0, 2, 10, 0))
-	assertNoError(Game.CreateShipType(Race_0.Name, ShipType_Cruiser, 15, 15, 15, 0, 1))
-
-	assertNoError(Game.CreateShipType(Race_1.Name, Race_1_Gunship, 60, 30, 100, 0, 3))
-	assertNoError(Game.CreateShipType(Race_1.Name, Race_1_Freighter, 8, 0, 2, 10, 0))
-	assertNoError(Game.CreateShipType(Race_1.Name, ShipType_Cruiser, 15, 15, 15, 0, 2)) // same name - different type
-}
-
 func assertNoError(err error) {
 	if err != nil {
 		panic(fmt.Sprintf("init assertion failed: %v", err))
 	}
 }
 
-func copyGame() *game.Game {
-	g := *Game
-	return &g
+func newGame() *game.Game {
+	g := &game.Game{
+		Race: []game.Race{
+			Race_0,
+			Race_1,
+		},
+		Map: game.Map{
+			Width:  10,
+			Height: 10,
+			Planet: []game.Planet{
+				controller.NewPlanet(R0_Planet_0_num, "Planet_0", Race_0.ID, 0, 0, 100, 100, 100, 0, game.ProductionNone.AsType(uuid.Nil)),
+				controller.NewPlanet(R1_Planet_1_num, "Planet_1", Race_1.ID, 1, 1, 100, 0, 0, 0, game.ProductionNone.AsType(uuid.Nil)),
+				controller.NewPlanet(R0_Planet_2_num, "Planet_2", Race_0.ID, 2, 2, 100, 0, 0, 0, game.ProductionNone.AsType(uuid.Nil)),
+			},
+		},
+	}
+	assertNoError(g.CreateShipType(Race_0.Name, Race_0_Gunship, 60, 30, 100, 0, 3))
+	assertNoError(g.CreateShipType(Race_0.Name, Race_0_Freighter, 8, 0, 2, 10, 0))
+	assertNoError(g.CreateShipType(Race_0.Name, ShipType_Cruiser, Cruiser.Drive, Cruiser.Weapons, Cruiser.Shields, Cruiser.Cargo, int(Cruiser.Armament)))
+
+	assertNoError(g.CreateShipType(Race_1.Name, Race_1_Gunship, 60, 30, 100, 0, 3))
+	assertNoError(g.CreateShipType(Race_1.Name, Race_1_Freighter, 8, 0, 2, 10, 0))
+	assertNoError(g.CreateShipType(Race_1.Name, ShipType_Cruiser, 15, 15, 15, 0, 2)) // same name - different type (why.)
+	return g
 }

internal/model/game/group.go

@@ -1,6 +1,7 @@
 package game
 
 import (
+	"fmt"
 	"iter"
 	"maps"
 	"math"
@@ -35,50 +36,128 @@ func (ct CargoType) String() string {
 	return string(ct)
 }
 
+type ShipGroupState string
+
+const (
+	StateInOrbit  ShipGroupState = "In_Orbit"
+	StateLaunched ShipGroupState = "Launched"
+	StateInSpace  ShipGroupState = "In_Space"
+	StateUpgrade  ShipGroupState = "Upgrade"
+	StateTransfer ShipGroupState = "Transfer_Status"
+)
+
+type InSpace struct {
+	Origin uint `json:"origin"`
+	// zero is for Launched status
+	Range float64 `json:"range"`
+}
+
+type InUpgrade struct {
+	UpgradeTech []UpgradePreference `json:"preference"`
+}
+
+func (iu InUpgrade) Cost() float64 {
+	var sum float64
+	for i := range iu.UpgradeTech {
+		sum += iu.UpgradeTech[i].Cost
+	}
+	return sum
+}
+
+func (iu InUpgrade) TechCost(t Tech) float64 {
+	for i := range iu.UpgradeTech {
+		if iu.UpgradeTech[i].Tech == t {
+			return iu.UpgradeTech[i].Cost
+		}
+	}
+	return 0.
+}
+
+type UpgradePreference struct {
+	Tech  Tech    `json:"tech"`
+	Level float64 `json:"level"`
+	Cost  float64 `json:"cost"`
+}
+
+type Tech string
+
+const (
+	TechAll     Tech = "ALL"
+	TechDrive   Tech = "DRIVE"
+	TechWeapons Tech = "WEAPONS"
+	TechShields Tech = "SHIELDS"
+	TechCargo   Tech = "CARGO"
+)
+
+func (t Tech) String() string {
+	return string(t)
+}
+
 type ShipGroup struct {
 	Index   uint       `json:"index"`             // FIXME: use UUID for Group Index (ordered)
 	OwnerID uuid.UUID  `json:"ownerId"`           // Race link
 	TypeID  uuid.UUID  `json:"typeId"`            // ShipType link
 	FleetID *uuid.UUID `json:"fleetId,omitempty"` // Fleet link
 	Number  uint       `json:"number"`            // Number (quantity) ships of specific ShipType
-	State   string     `json:"state"`             // TODO: kinda enum: In_Orbit, In_Space, Transfer_State, Upgrade
 
 	CargoType *CargoType `json:"loadType,omitempty"`
 	Load      float64    `json:"load"` // Cargo loaded - "Масса груза"
 
-	Drive   float64 `json:"drive"`
-	Weapons float64 `json:"weapons"`
-	Shields float64 `json:"shields"`
-	Cargo   float64 `json:"cargo"`
+	Tech TechSet `json:"tech"`
 
 	// TODO: TEST: Destination, Origin, Range
-	Destination uint     `json:"destination"`
-	Origin      *uint    `json:"origin,omitempty"`
-	Range       *float64 `json:"range,omitempty"`
+	Destination  uint       `json:"destination"`
+	StateInSpace *InSpace   `json:"stateInSpace,omitempty"`
+	StateUpgrade *InUpgrade `json:"stateUpgrade,omitempty"`
+}
+
+func (sg ShipGroup) TechLevel(t Tech) float64 {
+	return sg.Tech.Value(t)
+}
+
+// TODO: refactor to separate method with *ShipGroup as parameter
+func (sg *ShipGroup) SetTechLevel(t Tech, v float64) {
+	sg.Tech = sg.Tech.Set(t, v)
+}
+
+func (sg ShipGroup) State() ShipGroupState {
+	switch {
+	case sg.StateInSpace == nil && sg.StateUpgrade == nil:
+		return StateInOrbit
+	case sg.StateInSpace != nil && sg.StateUpgrade == nil:
+		if sg.StateInSpace.Range > 0 {
+			return StateInSpace
+		}
+		return StateLaunched
+	case sg.StateUpgrade != nil && sg.StateInSpace == nil:
+		return StateUpgrade
+	default:
+		panic(fmt.Sprintf("ambigous group state: in_space=%#v upgrage=%#v", sg.StateInSpace, sg.StateUpgrade))
+	}
 }
 
 func (sg ShipGroup) Equal(other ShipGroup) bool {
 	return sg.OwnerID == other.OwnerID &&
 		sg.TypeID == other.TypeID &&
 		sg.FleetID == other.FleetID &&
-		sg.Drive == other.Drive &&
-		sg.Weapons == other.Weapons &&
-		sg.Shields == other.Shields &&
-		sg.Cargo == other.Cargo &&
+		sg.TechLevel(TechDrive) == other.TechLevel(TechDrive) &&
+		sg.TechLevel(TechWeapons) == other.TechLevel(TechWeapons) &&
+		sg.TechLevel(TechShields) == other.TechLevel(TechShields) &&
+		sg.TechLevel(TechCargo) == other.TechLevel(TechCargo) &&
 		sg.CargoType == other.CargoType &&
 		sg.Load == other.Load &&
-		sg.State == other.State
+		sg.State() == other.State()
 }
 
 // Грузоподъёмность
 func (sg ShipGroup) CargoCapacity(st *ShipType) float64 {
-	return sg.Cargo * (st.Cargo + (st.Cargo*st.Cargo)/20) * float64(sg.Number)
+	return sg.TechLevel(TechCargo) * (st.Cargo + (st.Cargo*st.Cargo)/20) * float64(sg.Number)
 }
 
 // Масса перевозимого груза -
 // общее количество единиц груза, деленное на технологический уровень Грузоперевозок
 func (sg ShipGroup) CarryingMass() float64 {
-	return sg.Load / sg.Cargo
+	return sg.Load / sg.TechLevel(TechCargo)
 }
 
 // Масса группы без учёта груза
@@ -95,7 +174,7 @@ func (sg ShipGroup) FullMass(st *ShipType) float64 {
 // Эффективность двигателя -
 // равна мощности Двигателей, умноженной на технологический уровень блока Двигателей
 func (sg ShipGroup) DriveEffective(st *ShipType) float64 {
-	return st.Drive * sg.Drive
+	return st.Drive * sg.TechLevel(TechDrive)
 }
 
 // Корабли перемещаются за один ход на количество световых лет, равное
@@ -105,29 +184,29 @@ func (sg ShipGroup) Speed(st *ShipType) float64 {
 }
 
 func (sg ShipGroup) UpgradeDriveCost(st *ShipType, drive float64) float64 {
-	return (1 - sg.Drive/drive) * 10 * st.Drive
+	return (1 - sg.TechLevel(TechDrive)/drive) * 10 * st.Drive
 }
 
 // TODO: test on other values
 func (sg ShipGroup) UpgradeWeaponsCost(st *ShipType, weapons float64) float64 {
-	return (1 - sg.Weapons/weapons) * 10 * st.WeaponsMass()
+	return (1 - sg.TechLevel(TechWeapons)/weapons) * 10 * st.WeaponsBlockMass()
 }
 
 func (sg ShipGroup) UpgradeShieldsCost(st *ShipType, shields float64) float64 {
-	return (1 - sg.Shields/shields) * 10 * st.Shields
+	return (1 - sg.TechLevel(TechShields)/shields) * 10 * st.Shields
 }
 
 func (sg ShipGroup) UpgradeCargoCost(st *ShipType, cargo float64) float64 {
-	return (1 - sg.Cargo/cargo) * 10 * st.Cargo
+	return (1 - sg.TechLevel(TechCargo)/cargo) * 10 * st.Cargo
 }
 
 // Мощность бомбардировки
 // TODO: maybe rounding must be done only for display?
 func (sg ShipGroup) BombingPower(st *ShipType) float64 {
 	// return math.Sqrt(sg.Type.Weapons * sg.Weapons)
-	result := (math.Sqrt(st.Weapons*sg.Weapons)/10. + 1.) *
+	result := (math.Sqrt(st.Weapons*sg.TechLevel(TechWeapons))/10. + 1.) *
 		st.Weapons *
-		sg.Weapons *
+		sg.TechLevel(TechWeapons) *
 		float64(st.Armament) *
 		float64(sg.Number)
 	return number.Fixed3(result)
@@ -173,7 +252,7 @@ func (g *Game) disassembleGroupInternal(ri int, groupIndex, quantity uint) error
 		return e.NewEntityNotExistsError("group #%d", groupIndex)
 	}
 
-	if g.ShipGroups[sgi].State != "In_Orbit" || g.ShipGroups[sgi].Origin != nil || g.ShipGroups[sgi].Range != nil {
+	if g.ShipGroups[sgi].State() != StateInOrbit {
 		return e.NewShipsBusyError()
 	}
 
@@ -257,7 +336,7 @@ func (g *Game) unloadCargoInternal(ri int, groupIndex uint, ships uint, quantity
 	if sgi < 0 {
 		return e.NewEntityNotExistsError("group #%d", groupIndex)
 	}
-	if g.ShipGroups[sgi].State != "In_Orbit" || g.ShipGroups[sgi].Origin != nil || g.ShipGroups[sgi].Range != nil {
+	if g.ShipGroups[sgi].State() != StateInOrbit {
 		return e.NewShipsBusyError()
 	}
 	var sti int
@@ -336,7 +415,7 @@ func (g *Game) loadCargoInternal(ri int, groupIndex uint, ct CargoType, ships ui
 	if sgi < 0 {
 		return e.NewEntityNotExistsError("group #%d", groupIndex)
 	}
-	if g.ShipGroups[sgi].State != "In_Orbit" || g.ShipGroups[sgi].Origin != nil || g.ShipGroups[sgi].Range != nil {
+	if g.ShipGroups[sgi].State() != StateInOrbit {
 		return e.NewShipsBusyError()
 	}
 	pl := slices.IndexFunc(g.Map.Planet, func(p Planet) bool { return p.Number == g.ShipGroups[sgi].Destination })
@@ -464,19 +543,15 @@ func (g *Game) giveawayGroupInternal(ri, riAccept int, groupIndex, quantity uint
 		OwnerID: g.Race[riAccept].ID,
 		TypeID:  g.Race[riAccept].ShipTypes[stAcc].ID,
 		Number:  uint(quantity),
-		State:   g.ShipGroups[sgi].State,
 
 		CargoType: g.ShipGroups[sgi].CargoType,
 		Load:      g.ShipGroups[sgi].Load,
 
-		Drive:   g.ShipGroups[sgi].Drive,
-		Weapons: g.ShipGroups[sgi].Weapons,
-		Shields: g.ShipGroups[sgi].Shields,
-		Cargo:   g.ShipGroups[sgi].Cargo,
+		Tech: maps.Clone(g.ShipGroups[sgi].Tech),
 
-		Destination: g.ShipGroups[sgi].Destination,
-		Origin:      g.ShipGroups[sgi].Origin,
-		Range:       g.ShipGroups[sgi].Range,
+		Destination:  g.ShipGroups[sgi].Destination,
+		StateInSpace: g.ShipGroups[sgi].StateInSpace,
+		StateUpgrade: g.ShipGroups[sgi].StateUpgrade,
 	})
 
 	if quantity == 0 || quantity == g.ShipGroups[sgi].Number {
@@ -503,7 +578,7 @@ func (g *Game) breakGroupInternal(ri int, groupIndex, quantity uint) error {
 		return e.NewEntityNotExistsError("group #%d", groupIndex)
 	}
 
-	if g.ShipGroups[sgi].State != "In_Orbit" || g.ShipGroups[sgi].Origin != nil || g.ShipGroups[sgi].Range != nil {
+	if g.ShipGroups[sgi].State() != StateInOrbit {
 		return e.NewShipsBusyError()
 	}
 
@@ -599,11 +674,12 @@ func (g *Game) createShips(ri int, shipTypeName string, planetNumber int, quanti
 		TypeID:      g.Race[ri].ShipTypes[st].ID,
 		Destination: g.Map.Planet[pl].Number,
 		Number:      uint(quantity),
-		State:       "In_Orbit",
-		Drive:       g.Race[ri].Drive,
-		Weapons:     g.Race[ri].Weapons,
-		Shields:     g.Race[ri].Shields,
-		Cargo:       g.Race[ri].Cargo,
+		Tech: map[Tech]float64{
+			TechDrive:   g.Race[ri].TechLevel(TechDrive),
+			TechWeapons: g.Race[ri].TechLevel(TechWeapons),
+			TechShields: g.Race[ri].TechLevel(TechShields),
+			TechCargo:   g.Race[ri].TechLevel(TechCargo),
+		},
 	})
 	return nil
 }

internal/model/game/group_test.go

@@ -24,12 +24,13 @@ func TestCargoCapacity(t *testing.T) {
 			},
 		}
 		sg := game.ShipGroup{
-			Number:  1,
-			State:   "In_Orbit",
-			Drive:   1.5,
-			Weapons: 1.1,
-			Shields: 2.0,
-			Cargo:   1.0,
+			Number: 1,
+			Tech: map[game.Tech]float64{
+				game.TechDrive:   1.5,
+				game.TechWeapons: 1.1,
+				game.TechShields: 2.0,
+				game.TechCargo:   1.0,
+			},
 		}
 		assert.Equal(t, expectCapacity, sg.CargoCapacity(&ship))
 	}
@@ -52,13 +53,14 @@ func TestCarryingAndFullMass(t *testing.T) {
 		},
 	}
 	sg := &game.ShipGroup{
-		Number:  1,
-		State:   "In_Orbit",
-		Drive:   1.0,
-		Weapons: 1.0,
-		Shields: 1.0,
-		Cargo:   1.0,
-		Load:    0.0,
+		Number: 1,
+		Tech: map[game.Tech]float64{
+			game.TechDrive:   1.0,
+			game.TechWeapons: 1.0,
+			game.TechShields: 1.0,
+			game.TechCargo:   1.0,
+		},
+		Load: 0.0,
 	}
 	em := Freighter.EmptyMass()
 	assert.Equal(t, 0.0, sg.CarryingMass())
@@ -68,7 +70,7 @@ func TestCarryingAndFullMass(t *testing.T) {
 	assert.Equal(t, 10.0, sg.CarryingMass())
 	assert.Equal(t, em+10.0, sg.FullMass(Freighter))
 
-	sg.Cargo = 2.5
+	sg.SetTechLevel(game.TechCargo, 2.5)
 	assert.Equal(t, 4.0, sg.CarryingMass())
 	assert.Equal(t, em+4.0, sg.FullMass(Freighter))
 }
@@ -85,21 +87,22 @@ func TestSpeed(t *testing.T) {
 		},
 	}
 	sg := &game.ShipGroup{
-		Number:  1,
-		State:   "In_Orbit",
-		Drive:   1.0,
-		Weapons: 1.0,
-		Shields: 1.0,
-		Cargo:   1.0,
-		Load:    0.0,
+		Number: 1,
+		Tech: map[game.Tech]float64{
+			game.TechDrive:   1.0,
+			game.TechWeapons: 1.0,
+			game.TechShields: 1.0,
+			game.TechCargo:   1.0,
+		},
+		Load: 0.0,
 	}
 	assert.Equal(t, 8.0, sg.Speed(Freighter))
 	sg.Load = 5.0
 	assert.Equal(t, 6.4, sg.Speed(Freighter))
-	sg.Drive = 1.5
+	sg.SetTechLevel(game.TechDrive, 1.5)
 	assert.Equal(t, 9.6, sg.Speed(Freighter))
 	sg.Load = 10
-	sg.Cargo = 1.5
+	sg.SetTechLevel(game.TechCargo, 1.5)
 	assert.Equal(t, 9.0, sg.Speed(Freighter))
 }
 
@@ -114,45 +117,19 @@ func TestBombingPower(t *testing.T) {
 		},
 	}
 	sg := game.ShipGroup{
-		Number:  1,
-		State:   "In_Orbit",
-		Drive:   1.0,
-		Weapons: 1.0,
-		Shields: 1.0,
-		Cargo:   1.0,
+		Number: 1,
+		Tech: map[game.Tech]float64{
+			game.TechDrive:   1.0,
+			game.TechWeapons: 1.0,
+			game.TechShields: 1.0,
+			game.TechCargo:   1.0,
+		},
 	}
 	expectedBombingPower := 139.295
 	result := sg.BombingPower(&Gunship)
 	assert.Equal(t, expectedBombingPower, result)
 }
 
-func TestUpgradeCost(t *testing.T) {
-	Cruiser := game.ShipType{
-		ShipTypeReport: game.ShipTypeReport{
-			Name:     "Cruiser",
-			Drive:    15,
-			Armament: 1,
-			Weapons:  15,
-			Shields:  15,
-			Cargo:    0,
-		},
-	}
-
-	sg := game.ShipGroup{
-		Number:  1,
-		State:   "In_Orbit",
-		Drive:   1.0,
-		Weapons: 1.0,
-		Shields: 1.0,
-		Cargo:   1.0,
-	}
-	upgradeCost := sg.UpgradeDriveCost(&Cruiser, 2.0) +
-		sg.UpgradeWeaponsCost(&Cruiser, 2.0) +
-		sg.UpgradeShieldsCost(&Cruiser, 2.0) +
-		sg.UpgradeCargoCost(&Cruiser, 2.0)
-	assert.Equal(t, 225., upgradeCost)
-}
-
 func TestDriveEffective(t *testing.T) {
 	tc := []struct {
 		driveShipType        float64
@@ -178,12 +155,13 @@ func TestDriveEffective(t *testing.T) {
 			},
 		}
 		sg := game.ShipGroup{
-			Number:  rand.UintN(4) + 1,
-			State:   "In_Orbit",
-			Drive:   tc[i].driveTech,
-			Weapons: rand.Float64()*5 + 1,
-			Shields: rand.Float64()*5 + 1,
-			Cargo:   rand.Float64()*5 + 1,
+			Number: rand.UintN(4) + 1,
+			Tech: map[game.Tech]float64{
+				game.TechDrive:   tc[i].driveTech,
+				game.TechWeapons: rand.Float64()*5 + 1,
+				game.TechShields: rand.Float64()*5 + 1,
+				game.TechCargo:   rand.Float64()*5 + 1,
+			},
 		}
 		assert.Equal(t, tc[i].expectDriveEffective, sg.DriveEffective(&someShip))
 	}
@@ -201,13 +179,14 @@ func TestShipGroupEqual(t *testing.T) {
 		OwnerID:   uuid.New(),
 		TypeID:    uuid.New(),
 		FleetID:   &fleetId,
-		State:     "In_Orbit",
 		CargoType: &mat,
 		Load:      123.45,
-		Drive:     1.0,
-		Weapons:   1.0,
-		Shields:   1.0,
-		Cargo:     1.0,
+		Tech: map[game.Tech]float64{
+			game.TechDrive:   1.0,
+			game.TechWeapons: 1.0,
+			game.TechShields: 1.0,
+			game.TechCargo:   1.0,
+		},
 	}
 
 	// essential properties
@@ -230,7 +209,10 @@ func TestShipGroupEqual(t *testing.T) {
 	assert.False(t, left.Equal(right))
 
 	right = *left
-	left.State = "In_Space"
+	left.StateInSpace = &game.InSpace{
+		Origin: 1,
+		Range:  1,
+	}
 	assert.False(t, left.Equal(right))
 
 	right = *left
@@ -246,19 +228,23 @@ func TestShipGroupEqual(t *testing.T) {
 	assert.False(t, left.Equal(right))
 
 	right = *left
-	left.Drive = 1.1
+	left.SetTechLevel(game.TechDrive, 1.1)
+	assert.Equal(t, 1.1, left.TechLevel(game.TechDrive))
 	assert.False(t, left.Equal(right))
 
 	right = *left
-	left.Weapons = 1.1
+	left.SetTechLevel(game.TechWeapons, 1.1)
+	assert.Equal(t, 1.1, left.TechLevel(game.TechWeapons))
 	assert.False(t, left.Equal(right))
 
 	right = *left
-	left.Shields = 1.1
+	left.SetTechLevel(game.TechShields, 1.1)
+	assert.Equal(t, 1.1, left.TechLevel(game.TechShields))
 	assert.False(t, left.Equal(right))
 
 	right = *left
-	left.Cargo = 1.1
+	left.SetTechLevel(game.TechCargo, 1.1)
+	assert.Equal(t, 1.1, left.TechLevel(game.TechCargo))
 	assert.False(t, left.Equal(right))
 
 	// non-essential properties
@@ -271,7 +257,7 @@ func TestShipGroupEqual(t *testing.T) {
 }
 
 func TestCreateShips(t *testing.T) {
-	g := copyGame()
+	g := newGame()
 
 	assert.ErrorContains(t,
 		g.CreateShips(Race_0_idx, "Unknown_Ship_Type", R0_Planet_0_num, 2),
@@ -294,7 +280,7 @@ func TestCreateShips(t *testing.T) {
 }
 
 func TestJoinEqualGroups(t *testing.T) {
-	g := copyGame()
+	g := newGame()
 
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 1)) // 1 -> 2
 	assert.NoError(t, g.CreateShips(Race_1_idx, Race_1_Freighter, R1_Planet_1_num, 1))
@@ -302,7 +288,7 @@ func TestJoinEqualGroups(t *testing.T) {
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Gunship, R0_Planet_0_num, 2))   // (3)
 	assert.NoError(t, g.CreateShips(Race_1_idx, Race_1_Gunship, R1_Planet_1_num, 1))
 
-	g.Race[Race_0_idx].Drive = 1.5
+	g.Race[Race_0_idx].SetTechLevel(game.TechDrive, 1.5)
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Gunship, R0_Planet_0_num, 9))   // 4 -> 6
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 7)) // 5 -> 7
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Gunship, R0_Planet_0_num, 4))   // (6)
@@ -310,7 +296,7 @@ func TestJoinEqualGroups(t *testing.T) {
 
 	assert.Len(t, slices.Collect(g.ListShipGroups(Race_0_idx)), 7)
 
-	g.Race[Race_1_idx].Shields = 2.0
+	g.Race[Race_1_idx].SetTechLevel(game.TechShields, 2.0)
 	assert.NoError(t, g.CreateShips(1, Race_1_Freighter, R1_Planet_1_num, 1))
 	assert.Len(t, slices.Collect(g.ListShipGroups(Race_1_idx)), 3)
 
@@ -330,16 +316,16 @@ func TestJoinEqualGroups(t *testing.T) {
 
 	for sg := range g.ListShipGroups(Race_0_idx) {
 		switch {
-		case sg.TypeID == shipTypeID(Race_0_idx, Race_0_Freighter) && sg.Drive == 1.1:
+		case sg.TypeID == shipTypeID(Race_0_idx, Race_0_Freighter) && sg.TechLevel(game.TechDrive) == 1.1:
 			assert.Equal(t, uint(7), sg.Number)
 			assert.Equal(t, uint(2), sg.Index)
-		case sg.TypeID == shipTypeID(Race_0_idx, Race_0_Freighter) && sg.Drive == 1.5:
+		case sg.TypeID == shipTypeID(Race_0_idx, Race_0_Freighter) && sg.TechLevel(game.TechDrive) == 1.5:
 			assert.Equal(t, uint(11), sg.Number)
 			assert.Equal(t, uint(7), sg.Index)
-		case sg.TypeID == shipTypeID(Race_0_idx, Race_0_Gunship) && sg.Drive == 1.1:
+		case sg.TypeID == shipTypeID(Race_0_idx, Race_0_Gunship) && sg.TechLevel(game.TechDrive) == 1.1:
 			assert.Equal(t, uint(2), sg.Number)
 			assert.Equal(t, uint(3), sg.Index)
-		case sg.TypeID == shipTypeID(Race_0_idx, Race_0_Gunship) && sg.Drive == 1.5:
+		case sg.TypeID == shipTypeID(Race_0_idx, Race_0_Gunship) && sg.TechLevel(game.TechDrive) == 1.5:
 			assert.Equal(t, uint(13), sg.Number)
 			assert.Equal(t, uint(6), sg.Index)
 		default:
@@ -349,10 +335,13 @@ func TestJoinEqualGroups(t *testing.T) {
 }
 
 func TestBreakGroup(t *testing.T) {
-	g := copyGame()
+	g := newGame()
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 13)) // group #1 (0)
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Gunship, R0_Planet_0_num, 7))    // group #2 (1) - In_Space
-	g.ShipGroups[1].State = "In_Space"
+	g.ShipGroups[1].StateInSpace = &game.InSpace{
+		Origin: 1,
+		Range:  1,
+	}
 
 	fleet := "R0_Fleet"
 	assert.NoError(t, g.JoinShipGroupToFleet(Race_0.Name, fleet, 1, 0))
@@ -415,17 +404,17 @@ func TestBreakGroup(t *testing.T) {
 }
 
 func TestGiveawayGroup(t *testing.T) {
-	g := copyGame()
+	g := newGame()
 	assert.NoError(t, g.CreateShips(Race_0_idx, ShipType_Cruiser, R0_Planet_0_num, 11)) // group #1 (0)
 	assert.NoError(t, g.CreateShips(Race_1_idx, ShipType_Cruiser, R1_Planet_1_num, 23)) // group #1 (1)
 
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Gunship, R0_Planet_0_num, 17)) // group #2 (2) - In_Space
 	assert.NoError(t, g.JoinShipGroupToFleet(Race_0.Name, "R0_Fleet", 2, 0))
 	assert.NotNil(t, g.ShipGroups[2].FleetID)
-	g.ShipGroups[2].Origin = &R0_Planet_2_num
-	rng := 31.337
-	g.ShipGroups[2].Range = &rng
-	g.ShipGroups[2].State = "In_Space"
+	g.ShipGroups[2].StateInSpace = &game.InSpace{
+		Origin: 2,
+		Range:  31.337,
+	}
 	g.ShipGroups[2].CargoType = game.CargoMaterial.Ref()
 	g.ShipGroups[2].Load = 1.234
 
@@ -462,16 +451,16 @@ func TestGiveawayGroup(t *testing.T) {
 	assert.Equal(t, g.Race[Race_1_idx].ShipTypes[sti].Shields, g.Race[Race_0_idx].ShipTypes[sto].Shields)
 	assert.Equal(t, g.Race[Race_1_idx].ShipTypes[sti].Cargo, g.Race[Race_0_idx].ShipTypes[sto].Cargo)
 	assert.Equal(t, g.Race[Race_1_idx].ShipTypes[sti].Armament, g.Race[Race_0_idx].ShipTypes[sto].Armament)
-	assert.Equal(t, g.ShipGroups[2].State, g.ShipGroups[3].State)
+	assert.Equal(t, g.ShipGroups[2].State(), g.ShipGroups[3].State())
 	assert.Equal(t, g.ShipGroups[2].CargoType, g.ShipGroups[3].CargoType)
 	assert.Equal(t, g.ShipGroups[2].Load, g.ShipGroups[3].Load)
-	assert.Equal(t, g.ShipGroups[2].Drive, g.ShipGroups[3].Drive)
-	assert.Equal(t, g.ShipGroups[2].Weapons, g.ShipGroups[3].Weapons)
-	assert.Equal(t, g.ShipGroups[2].Shields, g.ShipGroups[3].Shields)
-	assert.Equal(t, g.ShipGroups[2].Cargo, g.ShipGroups[3].Cargo)
+	assert.Equal(t, g.ShipGroups[2].TechLevel(game.TechDrive), g.ShipGroups[3].TechLevel(game.TechDrive))
+	assert.Equal(t, g.ShipGroups[2].TechLevel(game.TechWeapons), g.ShipGroups[3].TechLevel(game.TechWeapons))
+	assert.Equal(t, g.ShipGroups[2].TechLevel(game.TechShields), g.ShipGroups[3].TechLevel(game.TechShields))
+	assert.Equal(t, g.ShipGroups[2].TechLevel(game.TechCargo), g.ShipGroups[3].TechLevel(game.TechCargo))
 	assert.Equal(t, g.ShipGroups[2].Destination, g.ShipGroups[3].Destination)
-	assert.Equal(t, g.ShipGroups[2].Origin, g.ShipGroups[3].Origin)
-	assert.Equal(t, g.ShipGroups[2].Range, g.ShipGroups[3].Range)
+	assert.Equal(t, g.ShipGroups[2].StateInSpace, g.ShipGroups[3].StateInSpace)
+	assert.Equal(t, g.ShipGroups[2].StateUpgrade, g.ShipGroups[3].StateUpgrade)
 	assert.Equal(t, g.ShipGroups[3].OwnerID, g.Race[Race_1_idx].ID)
 	assert.Equal(t, g.ShipGroups[3].TypeID, g.Race[Race_1_idx].ShipTypes[sti].ID)
 	assert.Equal(t, g.ShipGroups[3].Number, uint(11))
@@ -483,7 +472,7 @@ func TestGiveawayGroup(t *testing.T) {
 }
 
 func TestLoadCargo(t *testing.T) {
-	g := copyGame()
+	g := newGame()
 
 	// 1: idx = 0 / Ready to load
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 11))
@@ -493,10 +482,10 @@ func TestLoadCargo(t *testing.T) {
 
 	// 3: idx = 2 / In_Space
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 7))
-	g.ShipGroups[2].Origin = &R0_Planet_2_num
-	rng := 31.337
-	g.ShipGroups[2].Range = &rng
-	g.ShipGroups[2].State = "In_Space"
+	g.ShipGroups[2].StateInSpace = &game.InSpace{
+		Origin: 2,
+		Range:  31.337,
+	}
 
 	// 4: idx = 3 / loaded with COL
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 11))
@@ -603,7 +592,7 @@ func TestLoadCargo(t *testing.T) {
 }
 
 func TestUnloadCargo(t *testing.T) {
-	g := copyGame()
+	g := newGame()
 
 	// 1: idx = 0 / empty
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 10))
@@ -613,10 +602,10 @@ func TestUnloadCargo(t *testing.T) {
 
 	// 3: idx = 2 / In_Space
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 7))
-	g.ShipGroups[2].Origin = &R0_Planet_2_num
-	rng := 31.337
-	g.ShipGroups[2].Range = &rng
-	g.ShipGroups[2].State = "In_Space"
+	g.ShipGroups[2].StateInSpace = &game.InSpace{
+		Origin: 2,
+		Range:  31.337,
+	}
 
 	// 4: idx = 3 / loaded with COL
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 11))
@@ -699,17 +688,17 @@ func TestUnloadCargo(t *testing.T) {
 }
 
 func TestDisassembleGroup(t *testing.T) {
-	g := copyGame()
+	g := newGame()
 
 	// 1: idx = 0 / empty
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 10))
 
 	// 2: idx = 1 / In_Space
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 7))
-	g.ShipGroups[1].Origin = &R0_Planet_2_num
-	rng := 31.337
-	g.ShipGroups[1].Range = &rng
-	g.ShipGroups[1].State = "In_Space"
+	g.ShipGroups[1].StateInSpace = &game.InSpace{
+		Origin: 2,
+		Range:  31.337,
+	}
 
 	// 3: idx = 2 / loaded with COL
 	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 10))

internal/model/game/group_upgrade.go

@@ -0,0 +1,246 @@
+package game
+
+import (
+	"maps"
+	"math"
+	"slices"
+
+	"github.com/google/uuid"
+	e "github.com/iliadenisov/galaxy/internal/error"
+)
+
+type UpgradeCalc struct {
+	Cost map[Tech]float64
+}
+
+func (uc UpgradeCalc) UpgradeCost(ships uint) float64 {
+	var sum float64
+	for v := range maps.Values(uc.Cost) {
+		sum += v
+	}
+	return sum * float64(ships)
+}
+
+func (uc UpgradeCalc) UpgradeMaxShips(resources float64) uint {
+	return uint(math.Floor(resources / uc.UpgradeCost(1)))
+}
+
+func BlockUpgradeCost(blockMass, currentBlockTech, targetBlockTech float64) float64 {
+	if blockMass == 0 || targetBlockTech <= currentBlockTech {
+		return 0
+	}
+	return (1 - currentBlockTech/targetBlockTech) * 10 * blockMass
+}
+
+func GroupUpgradeCost(sg ShipGroup, st ShipType, drive, weapons, shields, cargo float64) UpgradeCalc {
+	uc := &UpgradeCalc{Cost: make(map[Tech]float64)}
+	if drive > 0 {
+		uc.Cost[TechDrive] = BlockUpgradeCost(st.DriveBlockMass(), sg.TechLevel(TechDrive), drive)
+	}
+	if weapons > 0 {
+		uc.Cost[TechWeapons] = BlockUpgradeCost(st.WeaponsBlockMass(), sg.TechLevel(TechWeapons), weapons)
+	}
+	if shields > 0 {
+		uc.Cost[TechShields] = BlockUpgradeCost(st.ShieldsBlockMass(), sg.TechLevel(TechShields), shields)
+	}
+	if cargo > 0 {
+		uc.Cost[TechCargo] = BlockUpgradeCost(st.CargoBlockMass(), sg.TechLevel(TechCargo), cargo)
+	}
+	return *uc
+}
+
+func (g *Game) UpgradeGroup(raceName string, groupIndex uint, techInput string, limitShips uint, limitLevel float64) error {
+	ri, err := g.raceIndex(raceName)
+	if err != nil {
+		return err
+	}
+	return g.upgradeGroupInternal(ri, groupIndex, techInput, limitShips, limitLevel)
+}
+
+func (g *Game) upgradeGroupInternal(ri int, groupIndex uint, techInput string, limitShips uint, limitLevel float64) error {
+	sgi := -1
+	for i, sg := range g.listIndexShipGroups(ri) {
+		if sgi < 0 && sg.Index == groupIndex {
+			sgi = i
+		}
+	}
+	if sgi < 0 {
+		return e.NewEntityNotExistsError("group #%d", groupIndex)
+	}
+
+	var sti int
+	if sti = slices.IndexFunc(g.Race[ri].ShipTypes, func(st ShipType) bool { return st.ID == g.ShipGroups[sgi].TypeID }); sti < 0 {
+		// hard to test, need manual game data invalidation
+		return e.NewGameStateError("not found: ShipType ID=%v", g.ShipGroups[sgi].TypeID)
+	}
+	st := g.Race[ri].ShipTypes[sti]
+
+	pl := slices.IndexFunc(g.Map.Planet, func(p Planet) bool { return p.Number == g.ShipGroups[sgi].Destination })
+	if pl < 0 {
+		return e.NewGameStateError("planet #%d", g.ShipGroups[sgi].Destination)
+	}
+	if g.Map.Planet[pl].Owner != uuid.Nil && g.Map.Planet[pl].Owner != g.Race[ri].ID {
+		return e.NewEntityNotOwnedError("planet #%d for upgrade group #%d", g.Map.Planet[pl].Number, groupIndex)
+	}
+
+	if g.ShipGroups[sgi].State() != StateInOrbit && g.ShipGroups[sgi].State() != StateUpgrade {
+		return e.NewShipsBusyError()
+	}
+
+	upgradeValidTech := map[string]Tech{
+		TechDrive.String():   TechDrive,
+		TechWeapons.String(): TechWeapons,
+		TechShields.String(): TechShields,
+		TechCargo.String():   TechCargo,
+		TechAll.String():     TechAll,
+	}
+
+	techRequest, ok := upgradeValidTech[techInput]
+	if !ok {
+		return e.NewTechUnknownError(techInput)
+	}
+
+	var blockMasses map[Tech]float64 = map[Tech]float64{
+		TechDrive:   st.DriveBlockMass(),
+		TechWeapons: st.WeaponsBlockMass(),
+		TechShields: st.ShieldsBlockMass(),
+		TechCargo:   st.CargoBlockMass(),
+	}
+
+	switch {
+	case techRequest != TechAll && blockMasses[techRequest] == 0:
+		return e.NewUpgradeShipTechNotUsedError()
+	case techRequest == TechAll && limitLevel != 0:
+		return e.NewUpgradeParameterNotAllowedError("tech=%s max_level=%f", techRequest.String(), limitLevel)
+	}
+
+	targetLevel := make(map[Tech]float64)
+	var sumLevels float64
+	for _, tech := range []Tech{TechDrive, TechWeapons, TechShields, TechCargo} {
+		if techRequest == TechAll || tech == techRequest {
+			if g.Race[ri].TechLevel(tech) < limitLevel {
+				return e.NewUpgradeTechLevelInsufficientError("%s=%.03f < %.03f", tech.String(), g.Race[ri].TechLevel(tech), limitLevel)
+			}
+			targetLevel[tech] = FutureUpgradeLevel(g.Race[ri].TechLevel(tech), g.ShipGroups[sgi].TechLevel(tech), limitLevel)
+		} else {
+			targetLevel[tech] = CurrentUpgradingLevel(g.ShipGroups[sgi], tech)
+		}
+		sumLevels += targetLevel[tech]
+	}
+
+	productionCapacity := PlanetProductionCapacity(g, g.Map.Planet[pl].Number)
+	if g.ShipGroups[sgi].State() == StateUpgrade {
+		// to calculate actual capacity we must substract upgrade cost of selected group, if is upgrade state
+		productionCapacity -= g.ShipGroups[sgi].StateUpgrade.Cost()
+	}
+	uc := GroupUpgradeCost(g.ShipGroups[sgi], st, targetLevel[TechDrive], targetLevel[TechWeapons], targetLevel[TechShields], targetLevel[TechCargo])
+	costForShip := uc.UpgradeCost(1)
+	if costForShip == 0 {
+		return e.NewUpgradeShipsAlreadyUpToDateError("%#v", targetLevel)
+	}
+
+	shipsToUpgrade := g.ShipGroups[sgi].Number
+	// НЕ БОЛЕЕ УКАЗАННОГО
+	if limitShips > 0 && shipsToUpgrade > limitShips {
+		shipsToUpgrade = limitShips
+	}
+
+	maxUpgradableShips := uc.UpgradeMaxShips(productionCapacity)
+
+	/*
+		1. считаем стоимость модернизации одного корабля
+		2. считаем сколько кораблей можно модернизировать
+		3. если не хватает даже на 1 корабль, ограничиваемся одним кораблём и пересчитываем коэффициент пропорционально массе блоков
+		4. иначе, считаем истинное количество кораблей с учётом ограничения maxShips
+	*/
+	blockMassSum := st.EmptyMass()
+
+	coef := productionCapacity / costForShip
+	if maxUpgradableShips == 0 {
+		if limitLevel > 0 {
+			return e.NewUpgradeInsufficientResourcesError("ship cost=%.03f L=%.03f", costForShip, productionCapacity)
+		}
+		sumLevels = sumLevels * coef
+		for tech := range targetLevel {
+			if blockMasses[tech] > 0 {
+				proportional := sumLevels * (blockMasses[tech] / blockMassSum)
+				targetLevel[tech] = proportional
+			}
+		}
+		maxUpgradableShips = 1
+	} else if maxUpgradableShips > shipsToUpgrade {
+		maxUpgradableShips = shipsToUpgrade
+	}
+
+	// sanity check
+	uc = GroupUpgradeCost(g.ShipGroups[sgi], st, targetLevel[TechDrive], targetLevel[TechWeapons], targetLevel[TechShields], targetLevel[TechCargo])
+	costForGroup := uc.UpgradeCost(maxUpgradableShips)
+	if costForGroup > productionCapacity {
+		e.NewGameStateError("cost recalculation: coef=%f cost(%d)=%f L=%f", coef, maxUpgradableShips, costForGroup, productionCapacity)
+	}
+
+	// break group if needed
+	if maxUpgradableShips < g.ShipGroups[sgi].Number {
+		if g.ShipGroups[sgi].State() == StateUpgrade {
+			return e.NewUpgradeGroupBreakNotAllowedError("ships=%d max=%d", g.ShipGroups[sgi].Number, maxUpgradableShips)
+		}
+		nsgi, err := g.breakGroupSafe(ri, groupIndex, maxUpgradableShips)
+		if err != nil {
+			return err
+		}
+		sgi = nsgi
+	}
+
+	// finally, fill group upgrade prefs
+	for tech := range targetLevel {
+		if targetLevel[tech] > 0 {
+			g.ShipGroups[sgi] = UpgradeGroupPreference(g.ShipGroups[sgi], st, tech, targetLevel[tech])
+		}
+	}
+
+	return nil
+}
+
+func CurrentUpgradingLevel(sg ShipGroup, tech Tech) float64 {
+	if sg.StateUpgrade == nil {
+		return 0
+	}
+	ti := slices.IndexFunc(sg.StateUpgrade.UpgradeTech, func(pref UpgradePreference) bool { return pref.Tech == tech })
+	if ti >= 0 {
+		return sg.StateUpgrade.UpgradeTech[ti].Level
+	}
+	return 0
+}
+
+func FutureUpgradeLevel(raceLevel, groupLevel, limit float64) float64 {
+	target := limit
+	if target == 0 || target > raceLevel {
+		target = raceLevel
+	}
+	if groupLevel == target {
+		return 0
+	}
+	return target
+}
+
+func UpgradeGroupPreference(sg ShipGroup, st ShipType, tech Tech, v float64) ShipGroup {
+	if v <= 0 || st.BlockMass(tech) == 0 || sg.TechLevel(tech) >= v {
+		return sg
+	}
+	var su InUpgrade
+	if sg.StateUpgrade != nil {
+		su = *sg.StateUpgrade
+	} else {
+		su = InUpgrade{UpgradeTech: []UpgradePreference{}}
+	}
+	ti := slices.IndexFunc(su.UpgradeTech, func(pref UpgradePreference) bool { return pref.Tech == tech })
+	if ti < 0 {
+		su.UpgradeTech = append(su.UpgradeTech, UpgradePreference{Tech: tech})
+		ti = len(su.UpgradeTech) - 1
+	}
+	su.UpgradeTech[ti].Level = v
+	su.UpgradeTech[ti].Cost = BlockUpgradeCost(st.BlockMass(tech), sg.TechLevel(tech), v) * float64(sg.Number)
+
+	sg.StateUpgrade = &su
+	return sg
+}

internal/model/game/group_upgrade_test.go

@@ -0,0 +1,169 @@
+package game_test
+
+import (
+	"slices"
+	"testing"
+
+	e "github.com/iliadenisov/galaxy/internal/error"
+	"github.com/iliadenisov/galaxy/internal/model/game"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestBlockUpgradeCost(t *testing.T) {
+	assert.Equal(t, 00.0, game.BlockUpgradeCost(1, 1.0, 1.0))
+	assert.Equal(t, 25.0, game.BlockUpgradeCost(5, 1.0, 2.0))
+	assert.Equal(t, 50.0, game.BlockUpgradeCost(10, 1.0, 2.0))
+}
+
+func TestGroupUpgradeCost(t *testing.T) {
+	sg := game.ShipGroup{
+		Tech: map[game.Tech]float64{
+			game.TechDrive:   1.0,
+			game.TechWeapons: 1.0,
+			game.TechShields: 1.0,
+			game.TechCargo:   1.0,
+		},
+		Number: 1,
+	}
+	assert.Equal(t, 225.0, game.GroupUpgradeCost(sg, Cruiser, 2.0, 2.0, 2.0, 2.0).UpgradeCost(1))
+}
+
+func TestUpgradeMaxShips(t *testing.T) {
+	sg := game.ShipGroup{
+		Tech: map[game.Tech]float64{
+			game.TechDrive:   1.0,
+			game.TechWeapons: 1.0,
+			game.TechShields: 1.0,
+			game.TechCargo:   1.0,
+		},
+		Number: 10,
+	}
+	uc := game.GroupUpgradeCost(sg, Cruiser, 2.0, 2.0, 2.0, 2.0)
+	assert.Equal(t, uint(4), uc.UpgradeMaxShips(1000))
+}
+
+func TestCurrentUpgradingLevel(t *testing.T) {
+	sg := &game.ShipGroup{
+		StateUpgrade: nil,
+	}
+	assert.Equal(t, 0.0, game.CurrentUpgradingLevel(*sg, game.TechDrive))
+	assert.Equal(t, 0.0, game.CurrentUpgradingLevel(*sg, game.TechWeapons))
+	assert.Equal(t, 0.0, game.CurrentUpgradingLevel(*sg, game.TechShields))
+	assert.Equal(t, 0.0, game.CurrentUpgradingLevel(*sg, game.TechCargo))
+
+	sg.StateUpgrade = &game.InUpgrade{
+		UpgradeTech: []game.UpgradePreference{
+			{Tech: game.TechDrive, Level: 1.5, Cost: 100.1},
+		},
+	}
+	assert.Equal(t, 1.5, game.CurrentUpgradingLevel(*sg, game.TechDrive))
+	assert.Equal(t, 0.0, game.CurrentUpgradingLevel(*sg, game.TechWeapons))
+	assert.Equal(t, 0.0, game.CurrentUpgradingLevel(*sg, game.TechShields))
+	assert.Equal(t, 0.0, game.CurrentUpgradingLevel(*sg, game.TechCargo))
+
+	sg.StateUpgrade.UpgradeTech = append(sg.StateUpgrade.UpgradeTech, game.UpgradePreference{Tech: game.TechCargo, Level: 2.2, Cost: 200.2})
+	assert.Equal(t, 1.5, game.CurrentUpgradingLevel(*sg, game.TechDrive))
+	assert.Equal(t, 0.0, game.CurrentUpgradingLevel(*sg, game.TechWeapons))
+	assert.Equal(t, 0.0, game.CurrentUpgradingLevel(*sg, game.TechShields))
+	assert.Equal(t, 2.2, game.CurrentUpgradingLevel(*sg, game.TechCargo))
+}
+
+func TestFutureUpgradeLevel(t *testing.T) {
+	assert.Equal(t, 0.0, game.FutureUpgradeLevel(2.0, 2.0, 2.0))
+	assert.Equal(t, 0.0, game.FutureUpgradeLevel(2.0, 2.0, 3.0))
+	assert.Equal(t, 1.5, game.FutureUpgradeLevel(1.5, 2.0, 3.0))
+	assert.Equal(t, 2.0, game.FutureUpgradeLevel(2.5, 1.0, 2.0))
+	assert.Equal(t, 2.5, game.FutureUpgradeLevel(2.5, 1.0, 0.0))
+}
+
+func TestUpgradeGroupPreference(t *testing.T) {
+	sg := game.ShipGroup{
+		Number: 4,
+		Tech: game.TechSet{
+			game.TechDrive:   1.0,
+			game.TechWeapons: 1.0,
+			game.TechShields: 1.0,
+			game.TechCargo:   1.0,
+		},
+	}
+	assert.Nil(t, sg.StateUpgrade)
+	sg = game.UpgradeGroupPreference(sg, Cruiser, game.TechDrive, 0)
+	assert.Nil(t, sg.StateUpgrade)
+
+	sg = game.UpgradeGroupPreference(sg, Cruiser, game.TechDrive, 2.0)
+	assert.NotNil(t, sg.StateUpgrade)
+	assert.Equal(t, 300., sg.StateUpgrade.TechCost(game.TechDrive))
+	assert.Equal(t, 300., sg.StateUpgrade.Cost())
+
+	sg = game.UpgradeGroupPreference(sg, Cruiser, game.TechWeapons, 2.0)
+	assert.NotNil(t, sg.StateUpgrade)
+	assert.Equal(t, 300., sg.StateUpgrade.TechCost(game.TechWeapons))
+	assert.Equal(t, 600., sg.StateUpgrade.Cost())
+
+	sg = game.UpgradeGroupPreference(sg, Cruiser, game.TechShields, 2.0)
+	assert.NotNil(t, sg.StateUpgrade)
+	assert.Equal(t, 300., sg.StateUpgrade.TechCost(game.TechShields))
+	assert.Equal(t, 900., sg.StateUpgrade.Cost())
+
+	sg = game.UpgradeGroupPreference(sg, Cruiser, game.TechCargo, 2.0)
+	assert.NotNil(t, sg.StateUpgrade)
+	assert.Equal(t, 0., sg.StateUpgrade.TechCost(game.TechCargo))
+	assert.Equal(t, 900., sg.StateUpgrade.Cost())
+}
+
+func TestUpgradeGroup(t *testing.T) {
+	g := newGame()
+	// group #1 - in_orbit, free to upgrade
+	assert.NoError(t, g.CreateShips(Race_0_idx, ShipType_Cruiser, R0_Planet_0_num, 10))
+	// group #2 - in_space
+	assert.NoError(t, g.CreateShips(Race_0_idx, ShipType_Cruiser, R0_Planet_0_num, 1))
+	g.ShipGroups[1].StateInSpace = &game.InSpace{Origin: 2, Range: 1.23}
+	// group #3 - in_orbit, foreign planet
+	assert.NoError(t, g.CreateShips(Race_0_idx, ShipType_Cruiser, R0_Planet_0_num, 1))
+	g.ShipGroups[2].Destination = R1_Planet_1_num
+
+	assert.ErrorContains(t,
+		g.UpgradeGroup("UnknownRace", 1, "DRIVE", 0, 0),
+		e.GenericErrorText(e.ErrInputUnknownRace))
+	assert.ErrorContains(t,
+		g.UpgradeGroup(Race_0.Name, 555, "DRIVE", 0, 0),
+		e.GenericErrorText(e.ErrInputEntityNotExists))
+	assert.ErrorContains(t,
+		g.UpgradeGroup(Race_0.Name, 2, "DRIVE", 0, 0),
+		e.GenericErrorText(e.ErrShipsBusy))
+	assert.ErrorContains(t,
+		g.UpgradeGroup(Race_0.Name, 3, "DRIVE", 0, 0),
+		e.GenericErrorText(e.ErrInputEntityNotOwned))
+	assert.ErrorContains(t,
+		g.UpgradeGroup(Race_0.Name, 1, "GUN", 0, 0),
+		e.GenericErrorText(e.ErrInputTechUnknown))
+	assert.ErrorContains(t,
+		g.UpgradeGroup(Race_0.Name, 1, "CARGO", 0, 0),
+		e.GenericErrorText(e.ErrInputUpgradeShipTechNotUsed))
+	assert.ErrorContains(t,
+		g.UpgradeGroup(Race_0.Name, 1, "ALL", 0, 2.0),
+		e.GenericErrorText(e.ErrInputUpgradeParameterNotAllowed))
+	assert.ErrorContains(t,
+		g.UpgradeGroup(Race_0.Name, 1, "DRIVE", 0, 2.0),
+		e.GenericErrorText(e.ErrInputUpgradeTechLevelInsufficient))
+	assert.ErrorContains(t,
+		g.UpgradeGroup(Race_0.Name, 1, "DRIVE", 0, 1.1),
+		e.GenericErrorText(e.ErrInputUpgradeShipsAlreadyUpToDate))
+
+	g.Race[Race_0_idx].SetTechLevel(game.TechDrive, 10.0)
+	assert.Equal(t, 10.0, g.Race[Race_0_idx].TechLevel(game.TechDrive))
+	assert.ErrorContains(t,
+		g.UpgradeGroup(Race_0.Name, 1, "DRIVE", 0, 10.0),
+		e.GenericErrorText(e.ErrUpgradeInsufficientResources))
+
+	assert.NoError(t, g.UpgradeGroup(Race_0.Name, 1, "DRIVE", 2, 1.2))
+	assert.Len(t, slices.Collect(g.ListShipGroups(Race_0_idx)), 4)
+	assert.Equal(t, uint(8), g.ShipGroups[0].Number)
+	assert.Equal(t, uint(2), g.ShipGroups[3].Number)
+	assert.Equal(t, game.StateInOrbit, g.ShipGroups[0].State())
+	assert.Equal(t, game.StateUpgrade, g.ShipGroups[3].State())
+
+	assert.ErrorContains(t,
+		g.UpgradeGroup(Race_0.Name, 4, "DRIVE", 1, 1.3),
+		e.GenericErrorText(e.ErrInputUpgradeGroupBreakNotAllowed))
+}

internal/model/game/planet.go

@@ -25,10 +25,10 @@ type UninhabitedPlanet struct {
 
 type PlanetReport struct {
 	UninhabitedPlanet
-	Industry   float64        `json:"industry"`   // I - Промышленность
-	Population float64        `json:"population"` // P - Население
-	Colonists  float64        `json:"colonists"`  // COL C - Количество колонистов
-	Production ProductionType `json:"production"` // TODO: internal/report format
+	Industry   float64    `json:"industry"`   // I - Промышленность
+	Population float64    `json:"population"` // P - Население
+	Colonists  float64    `json:"colonists"`  // COL C - Количество колонистов
+	Production Production `json:"production"` // TODO: internal/report format
 	// Параметр "L" - Свободный производственный потенциал
 }
 
@@ -42,13 +42,30 @@ type PlanetReportForeign struct {
 	PlanetReport
 }
 
-// Свободный производственный потенциал (L)
-// промышленность * 0.75 + население * 0.25
-// TODO: за вычетом затрат, расходуемых в течение хода на модернизацию кораблей
+// TODO: delete func
 func (p Planet) ProductionCapacity() float64 {
 	return p.Industry*0.75 + p.Population*0.25
 }
 
+// Свободный производственный потенциал (L)
+// промышленность * 0.75 + население * 0.25
+// за вычетом затрат, расходуемых в течение хода на модернизацию кораблей
+func PlanetProductionCapacity(g *Game, planetNumber uint) float64 {
+	p, err := g.PlanetByNumber(planetNumber)
+	if err != nil {
+		panic(err)
+	}
+	var busyResources float64
+	for sg := range g.ShipsInUpgrade(p.Number) {
+		busyResources += sg.StateUpgrade.Cost()
+	}
+	return PlanetProduction(p.Industry, p.Population) - busyResources
+}
+
+func PlanetProduction(industry, population float64) float64 {
+	return industry*0.75 + population*0.25
+}
+
 // Производство промышленности
 // TODO: test on real values
 func (p *Planet) IncreaseIndustry() {

internal/model/game/planet_test.go

@@ -0,0 +1,22 @@
+package game_test
+
+import (
+	"testing"
+
+	"github.com/iliadenisov/galaxy/internal/model/game"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPlanetProduction(t *testing.T) {
+	assert.Equal(t, 1000., game.PlanetProduction(1000., 1000.))
+	assert.Equal(t, 750., game.PlanetProduction(1000., 0.))
+	assert.Equal(t, 250., game.PlanetProduction(0., 1000.))
+}
+
+func TestPlanetProductionCapacity(t *testing.T) {
+	g := newGame()
+	assert.NoError(t, g.CreateShips(Race_0_idx, ShipType_Cruiser, R0_Planet_0_num, 1))
+	assert.Equal(t, 100., game.PlanetProductionCapacity(g, R0_Planet_0_num))
+	g.ShipGroups[0] = game.UpgradeGroupPreference(g.ShipGroups[0], Cruiser, game.TechDrive, 1.6)
+	assert.Equal(t, 53.125, game.PlanetProductionCapacity(g, R0_Planet_0_num))
+}

internal/model/game/production.go

@@ -7,34 +7,34 @@ import (
 	e "github.com/iliadenisov/galaxy/internal/error"
 )
 
-type PlanetProduction string
+type ProductionType string
 
 const (
-	ProductionNone     PlanetProduction = "-"
-	ProductionMaterial PlanetProduction = "MAT" // Сырьё
-	ProductionCapital  PlanetProduction = "CAP" // Промышленность
+	ProductionNone     ProductionType = "-"
+	ProductionMaterial ProductionType = "MAT" // Сырьё
+	ProductionCapital  ProductionType = "CAP" // Промышленность
 
-	ResearchDrive   PlanetProduction = "DRIVE"
-	ResearchWeapons PlanetProduction = "WEAPONS"
-	ResearchShields PlanetProduction = "SHIELDS"
-	ResearchCargo   PlanetProduction = "CARGO"
+	ResearchDrive   ProductionType = "DRIVE"
+	ResearchWeapons ProductionType = "WEAPONS"
+	ResearchShields ProductionType = "SHIELDS"
+	ResearchCargo   ProductionType = "CARGO"
 
-	ResearchScience PlanetProduction = "SCIENCE"
-	ProductionShip  PlanetProduction = "SHIP"
+	ResearchScience ProductionType = "SCIENCE"
+	ProductionShip  ProductionType = "SHIP"
 )
 
-type ProductionType struct {
-	Production PlanetProduction `json:"type"`
-	SubjectID  *uuid.UUID       `json:"subjectId"`
-	Progress   *float64         `json:"progress"`
+type Production struct {
+	Type      ProductionType `json:"type"`
+	SubjectID *uuid.UUID     `json:"subjectId"`
+	Progress  *float64       `json:"progress"`
 }
 
-func (p PlanetProduction) AsType(subject uuid.UUID) ProductionType {
+func (p ProductionType) AsType(subject uuid.UUID) Production {
 	switch p {
 	case ResearchScience, ProductionShip:
-		return ProductionType{Production: p, SubjectID: &subject}
+		return Production{Type: p, SubjectID: &subject}
 	default:
-		return ProductionType{Production: p, SubjectID: nil}
+		return Production{Type: p, SubjectID: nil}
 	}
 }
 
@@ -43,8 +43,8 @@ func (g Game) PlanetProduction(raceName string, planetNumber int, prodType, subj
 	if err != nil {
 		return err
 	}
-	var prod PlanetProduction
-	switch PlanetProduction(prodType) {
+	var prod ProductionType
+	switch ProductionType(prodType) {
 	case ProductionMaterial:
 		prod = ProductionMaterial
 	case ProductionCapital:
@@ -67,7 +67,7 @@ func (g Game) PlanetProduction(raceName string, planetNumber int, prodType, subj
 	return g.planetProductionInternal(ri, planetNumber, prod, subject)
 }
 
-func (g Game) planetProductionInternal(ri int, number int, prod PlanetProduction, subj string) error {
+func (g Game) planetProductionInternal(ri int, number int, prod ProductionType, subj string) error {
 	if number < 0 {
 		return e.NewPlanetNumberError(number)
 	}
@@ -95,7 +95,7 @@ func (g Game) planetProductionInternal(ri int, number int, prod PlanetProduction
 		if i < 0 {
 			return e.NewEntityNotExistsError("ship type %w", subj)
 		}
-		if g.Map.Planet[i].Production.Production == ProductionShip &&
+		if g.Map.Planet[i].Production.Type == ProductionShip &&
 			g.Map.Planet[i].Production.SubjectID != nil &&
 			*g.Map.Planet[i].Production.SubjectID == g.Race[ri].ShipTypes[i].ID {
 			// Planet already produces this ship type, keeping progress intact
@@ -105,7 +105,7 @@ func (g Game) planetProductionInternal(ri int, number int, prod PlanetProduction
 		var progress float64 = 0.
 		g.Map.Planet[i].Production.Progress = &progress
 	}
-	if g.Map.Planet[i].Production.Production == ProductionShip {
+	if g.Map.Planet[i].Production.Type == ProductionShip {
 		if g.Map.Planet[i].Production.SubjectID == nil {
 			return e.NewGameStateError("planet #%d produces ship but SubjectID is empty", g.Map.Planet[i].Number)
 		}
@@ -122,7 +122,7 @@ func (g Game) planetProductionInternal(ri int, number int, prod PlanetProduction
 		extra := mat * progress
 		g.Map.Planet[i].Material += extra
 	}
-	g.Map.Planet[i].Production.Production = prod
+	g.Map.Planet[i].Production.Type = prod
 	g.Map.Planet[i].Production.SubjectID = subjectID
 	return nil
 }

internal/model/game/race.go

@@ -1,6 +1,8 @@
 package game
 
-import "github.com/google/uuid"
+import (
+	"github.com/google/uuid"
+)
 
 type Race struct {
 	ID      uuid.UUID `json:"id"`
@@ -10,10 +12,7 @@ type Race struct {
 	Vote      uuid.UUID      `json:"vote"`
 	Relations []RaceRelation `json:"relations"`
 
-	Drive   float64 `json:"drive"`
-	Weapons float64 `json:"weapons"`
-	Shields float64 `json:"shields"`
-	Cargo   float64 `json:"cargo"`
+	Tech TechSet `json:"tech"`
 
 	Sciences []Science `json:"science,omitempty"`
 
@@ -32,10 +31,19 @@ type RaceRelation struct {
 	Relation Relation  `json:"relation"`
 }
 
+func (r Race) TechLevel(t Tech) float64 {
+	return r.Tech.Value(t)
+}
+
+// TODO: refactor to separate method with *Race as parameter
+func (r *Race) SetTechLevel(t Tech, v float64) {
+	r.Tech = r.Tech.Set(t, v)
+}
+
 func (r Race) FlightDistance() float64 {
-	return r.Drive * 40
+	return r.TechLevel(TechDrive) * 40
 }
 
 func (r Race) VisibilityDistance() float64 {
-	return r.Drive * 30
+	return r.TechLevel(TechDrive) * 30
 }

internal/model/game/science.go

@@ -51,7 +51,7 @@ func (g Game) deleteScienceInternal(ri int, name string) error {
 		return e.NewEntityNotExistsError("science %w", name)
 	}
 	if pl := slices.IndexFunc(g.Map.Planet, func(p Planet) bool {
-		return p.Production.Production == ResearchScience &&
+		return p.Production.Type == ResearchScience &&
 			p.Production.SubjectID != nil &&
 			*p.Production.SubjectID == g.Race[ri].Sciences[sc].ID
 	}); pl >= 0 {

internal/model/game/ship.go

@@ -35,18 +35,45 @@ func (st ShipType) Equal(o ShipType) bool {
 		st.Cargo == o.Cargo
 }
 
-func (st ShipType) EmptyMass() float64 {
-	shipMass := st.Drive + st.Shields + st.Cargo + st.WeaponsMass()
-	return shipMass
+func (st ShipType) BlockMass(t Tech) float64 {
+	switch t {
+	case TechDrive:
+		return st.DriveBlockMass()
+	case TechWeapons:
+		return st.WeaponsBlockMass()
+	case TechShields:
+		return st.ShieldsBlockMass()
+	case TechCargo:
+		return st.CargoBlockMass()
+	default:
+		panic("BlockMass: unexpectec tech: " + t.String())
+	}
 }
 
-func (st ShipType) WeaponsMass() float64 {
+func (st ShipType) DriveBlockMass() float64 {
+	return st.Drive
+}
+
+func (st ShipType) WeaponsBlockMass() float64 {
 	if st.Armament == 0 || st.Weapons == 0 {
 		return 0
 	}
 	return float64(st.Armament+1) * (st.Weapons / 2)
 }
 
+func (st ShipType) ShieldsBlockMass() float64 {
+	return st.Shields
+}
+
+func (st ShipType) CargoBlockMass() float64 {
+	return st.Cargo
+}
+
+func (st ShipType) EmptyMass() float64 {
+	shipMass := st.DriveBlockMass() + st.ShieldsBlockMass() + st.CargoBlockMass() + st.WeaponsBlockMass()
+	return shipMass
+}
+
 // ProductionCost returns Material (MAT) and Population (POP) to produce this [ShipType]
 func (st ShipType) ProductionCost() (mat float64, pop float64) {
 	mat = st.EmptyMass()
@@ -89,7 +116,7 @@ func (g Game) deleteShipTypeInternal(ri int, name string) error {
 		return e.NewEntityNotExistsError("ship type %w", name)
 	}
 	if pl := slices.IndexFunc(g.Map.Planet, func(p Planet) bool {
-		return p.Production.Production == ProductionShip &&
+		return p.Production.Type == ProductionShip &&
 			p.Production.SubjectID != nil &&
 			g.Race[ri].ShipTypes[st].ID == *p.Production.SubjectID
 	}); pl >= 0 {
@@ -160,7 +187,7 @@ func (g Game) mergeShipTypeInternal(ri int, name, targetName string) error {
 	// switch planet productions to the new type
 	for pl := range g.Map.Planet {
 		if g.Map.Planet[pl].Owner == g.Race[ri].ID &&
-			g.Map.Planet[pl].Production.Production == ProductionShip &&
+			g.Map.Planet[pl].Production.Type == ProductionShip &&
 			g.Map.Planet[pl].Production.SubjectID != nil &&
 			*g.Map.Planet[pl].Production.SubjectID == g.Race[ri].ShipTypes[st].ID {
 			g.Map.Planet[pl].Production.SubjectID = &g.Race[ri].ShipTypes[tt].ID