intermediate commit

18 files changed, 792 insertions, 304 deletions

diff --git a/go/client/game.go b/go/client/game.go
index 2f112593..00ef4153 100644
--- a/go/client/game.go
+++ b/go/client/game.go
@@ -253,12 +253,13 @@ func (g *Game) removeWidgetAt(idx int) {
 }
 
 func (g *Game) addActionChoice(perm game.Permanent, x, y int) {
-	actions := perm.AvailActionPrototypes()
+	actions := perm.AvailActions()
 	if len(actions) > 0 {
 		g.selectedObject = perm
 		onClick := func(c *ui.Choice, x, y int) {
 			g.removeActionChoice()
-			g.selectedObject = actions[c.GetChoosen(x, y)]
+			a := actions[c.GetChoosen(x, y)]
+			g.selectedObject = a
 		}
 		g.actionChoice = ui.NewActionChoice(x, y, actions, onClick)
 		g.addWidget(g.actionChoice)
@@ -363,78 +364,63 @@ func (g *Game) findObjectAt(x, y int) interface{} {
 	return nil
 }
 
+func (g *Game) handleTargetSelection(obj interface{}) {
+	log.Println("Handle target selection")
+	a := g.selectedObject.(game.Action)
+	a.Targets().AddTarget(obj)
+
+	if !a.Targets().RequireTargets() {
+		log.Println("declare", a)
+		g.declareAction(a)
+		g.selectedObject = nil
+	}
+}
+
 func (g *Game) handleSelection(obj interface{}, x, y int) {
 	if obj == nil {
 		fmt.Printf("No object found at cursor position (%d, %d)\n", x, y)
 		return
 	}
 
-	switch obj := obj.(type) {
-	case ui.Button:
-		obj.Click(x, y)
+	if _, ok := g.selectedObject.(game.Action); ok {
+		g.handleTargetSelection(obj)
+	} else {
+		switch obj := obj.(type) {
+		case ui.Button:
+			obj.Click(x, y)
 
-	case *game.Tile:
-		tile := obj
-		if g.selectedObject != nil {
-			var action game.Action
-			switch obj := g.selectedObject.(type) {
-			case *game.MoveActionPrototype:
-				action = obj.Specialize(g.gameState, tile)
-			case *game.Card:
-				if obj.IsPermanent() {
-					action = game.NewPlayAction(g.activePlayer, obj, tile.Position)
-				}
-			}
-			if action != nil {
-				g.declareAction(action)
-				g.selectedObject = nil
-				g.mapView.HighlightTile(tile)
-			}
-		} else {
-			g.mapView.HighlightTile(tile)
-		}
+		case *game.Tile:
+			g.mapView.HighlightTile(obj)
 
-	case game.Permanent:
-		perm := obj
-		if g.selectedObject == nil {
+		case game.Permanent:
+			perm := obj
 			g.addActionChoice(perm, x, y)
-		} else {
-			switch obj := g.selectedObject.(type) {
-			case *game.AttackActionPrototype:
-				action := obj.Specialize(g.gameState, perm)
-				g.selectedObject = nil
-				g.declareAction(action)
-				g.mapView.HighlightPermanent(perm)
-			}
-		}
 
-	case ui.HandCard:
-		g.selectedObject = obj.C
+		case ui.HandCard:
+			g.selectedObject = game.NewPlayAction(g.activePlayer, obj.C)
+			g.handLayer.HighlightCard(obj.C)
 
-	case *game.Card:
-		if g.gameState.IsActivePlayer(g.activePlayer) &&
-			g.gameState.ActivePhase == game.Phases.BuyPhase {
-			g.declareAction(game.NewBuyAction(g.activePlayer, obj))
-		}
+		case *game.Card:
+			if g.gameState.IsActivePlayer(g.activePlayer) &&
+				g.gameState.ActivePhase == game.Phases.BuyPhase {
+				g.declareAction(game.NewBuyAction(g.activePlayer, obj))
+			}
 
-	default:
-		log.Fatalf("Object of type %T not handled", obj)
+		default:
+			log.Fatalf("Object of type %T not handled", obj)
+		}
 	}
 }
 
-func (g *Game) hightlightSelection(obj interface{}) {
-	switch obj := g.selectedObject.(type) {
-	case *game.MoveActionPrototype:
-		g.mapView.HighlightTiles(obj.Unit.MoveRangeTiles(g.gameState.Map))
-	case *game.AttackActionPrototype:
-		perms := obj.Unit.AttackablePermanents(g.gameState.Map)
-		g.mapView.HighlightPermanents(perms)
-	case *game.Card:
-		g.handLayer.HighlightCard(obj)
-		if obj.IsPermanent() {
-			spawnTiles := g.gameState.AvailableSpawnTiles(g.activePlayer, obj)
-			g.mapView.HighlightTiles(spawnTiles)
-		}
+func (g *Game) highlightTargets() {
+	a, ok := g.selectedObject.(game.Action)
+	if !ok {
+		return
+	}
+
+	options := a.Targets().NextOptions()
+	for _, option := range options {
+		g.AddHighlight(option)
 	}
 }
 
@@ -489,6 +475,15 @@ func (g *Game) Update() error {
 
 	obj := g.findObjectAt(x, y)
 
+	scrollX, scrollY := ebiten.Wheel()
+	if scrollX != 0 || scrollY != 0 {
+		if scrollable, ok := obj.(ui.Scrollable); ok {
+			scrollable.Scroll(int(scrollX), int(scrollY))
+		}
+	}
+
+	g.highlightTargets()
+
 	if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
 		if g.prompt != nil {
 			g.prompt.Add(obj)
@@ -496,7 +491,6 @@ func (g *Game) Update() error {
 		} else {
 			g.handleSelection(obj, x, y)
 		}
-		g.hightlightSelection(obj)
 	} else if g.hoverDetector.startedHovering() && g.selectedObject == nil && obj != nil {
 		g.handleHover(obj, x, y)
 	} else if inpututil.IsKeyJustPressed(ebiten.KeySpace) {
diff --git a/go/client/main.go b/go/client/main.go
index 63fcab00..3635404f 100644
--- a/go/client/main.go
+++ b/go/client/main.go
@@ -31,7 +31,7 @@ type app struct {
 	windowWidth  int
 	windowHeight int
 
-	active    ebiten.Game
+	active  ebiten.Game
 	running bool
 }
 
@@ -63,7 +63,6 @@ func main() {
 	flag.StringVar(&startMenu.remote, "remote", "", "address of remote game to connect to")
 	flag.Parse()
 
-
 	ebiten.SetWindowSize(app.windowWidth, app.windowHeight)
 	ebiten.SetWindowTitle("Muhq's Game")
 
diff --git a/go/client/startMenu.go b/go/client/startMenu.go
index 07c4f92b..735753b0 100644
--- a/go/client/startMenu.go
+++ b/go/client/startMenu.go
@@ -10,12 +10,12 @@ import (
 )
 
 const (
-	START_BUTTON_WIDTH = 150
+	START_BUTTON_WIDTH  = 150
 	START_BUTTON_HEIGHT = 50
 )
 
 type StartMenu struct {
-	app *app
+	app           *app
 	width, height int
 
 	playerName string
@@ -31,10 +31,10 @@ func NewStartMenu(app *app) *StartMenu {
 	return m
 }
 
-func (m *StartMenu) build () {
+func (m *StartMenu) build() {
 	m.widgets = append(m.widgets, ui.NewSimpleButton(
-		(m.width - START_BUTTON_WIDTH) / 2,
-		(m.height - START_BUTTON_HEIGHT) / 2,
+		(m.width-START_BUTTON_WIDTH)/2,
+		(m.height-START_BUTTON_HEIGHT)/2,
 		150,
 		50,
 		"Start",
diff --git a/go/game/action.go b/go/game/action.go
index 0f7a1294..4894d47d 100644
--- a/go/game/action.go
+++ b/go/game/action.go
@@ -4,40 +4,52 @@ import (
 	"fmt"
 )
 
-type ActionPrototype interface {
-	Specialize(*State, ...interface{}) Action
-	String() string
-}
+type (
+	ActionCostFunc      func(*State) bool
+	ActionResolveFunc   func(*State)
+	ActionFuncPrototype func(Action) ActionResolveFunc
+)
 
 type Action interface {
-	Resolve(s *State)
+	Source() interface{}
+	Targets() *Targets
+
+	CheckTargets(*State) error
 	PayCosts(s *State) bool
+	Resolve(s *State)
 	String() string
 }
 
-type PassPriority struct{ Source *Player }
+type PassPriority struct{ source *Player }
 
-func (*PassPriority) Resolve(*State)       {}
-func (*PassPriority) PayCosts(*State) bool { return true }
-func (*PassPriority) String() string       { return "pass" }
-func NewPassPriority(p *Player) Action     { return &PassPriority{p} }
+func (a *PassPriority) Source() interface{}     { return a.source }
+func (*PassPriority) Targets() *Targets         { return nil }
+func (*PassPriority) CheckTargets(*State) error { return nil }
+func (*PassPriority) PayCosts(*State) bool      { return true }
+func (*PassPriority) Resolve(*State)            {}
+func (*PassPriority) String() string            { return "pass" }
+func NewPassPriority(p *Player) Action          { return &PassPriority{p} }
 
-type HandCardSelection struct {
-	cards []*Card
-}
+type HandCardSelection struct{ cards []*Card }
 
-func (*HandCardSelection) Resolve(*State)       {}
-func (*HandCardSelection) PayCosts(*State) bool { return true }
-func (*HandCardSelection) String() string       { return "hand card selection" }
-func NewHandCardSelection(cards []*Card) Action { return &HandCardSelection{cards} }
+func (*HandCardSelection) Source() interface{}       { return nil }
+func (*HandCardSelection) Targets() *Targets         { return nil }
+func (*HandCardSelection) CheckTargets(*State) error { return nil }
+func (*HandCardSelection) PayCosts(*State) bool      { return true }
+func (*HandCardSelection) Resolve(*State)            {}
+func (*HandCardSelection) String() string            { return "hand card selection" }
+func NewHandCardSelection(cards []*Card) Action      { return &HandCardSelection{cards} }
 
 type ActionBase struct {
-	Source      interface{}
+	source      interface{}
 	Card        *Card
-	Targets     interface{}
-	resolveFunc func(s *State)
-	costFunc    func(s *State) bool
-	desc        string
+	targets     *Targets
+	resolveFunc ActionResolveFunc
+	costFunc    ActionCostFunc
+}
+
+func (a *ActionBase) Source() interface{} {
+	return a.source
 }
 
 func (a *ActionBase) Resolve(s *State) {
@@ -48,73 +60,91 @@ func (a *ActionBase) PayCosts(s *State) bool {
 	return a.costFunc(s)
 }
 
-func (a *ActionBase) String() string {
-	switch source := a.Source.(type) {
-	case Permanent:
-		p := source
-		return fmt.Sprintf("%s: %s %s", p.Controller().Name, p.Tile().Position.String(), a.desc)
-	case *Player:
-		return fmt.Sprintf("%s %s", source.Name, a.desc)
-	default:
-		return fmt.Sprintf("%v %s", source, a.desc)
-	}
+func (a *ActionBase) Targets() *Targets {
+	return a.targets
+}
+
+func (a *ActionBase) CheckTargets(s *State) error {
+	return a.targets.CheckTargets(s)
 }
 
 type PlayAction struct {
 	ActionBase
 }
 
-func NewPlayAction(p *Player, c *Card, targets interface{}) Action {
-	costFunc := func(*State) bool {
-		cost := c.PlayCosts()
+const permanentPlayActionTarget = "available spawn tile"
 
-		if p.Resource < cost {
-			return false
+func NewPlayAction(p *Player, c *Card, args ...interface{}) *PlayAction {
+	a := &PlayAction{ActionBase{
+		source: p,
+		Card:   c,
+	}}
+
+	if len(args) > 0 {
+		if costFunc, ok := args[0].(ActionCostFunc); ok {
+			a.costFunc = costFunc
 		}
-		p.Resource -= cost
-		return true
 	}
-	return NewPlayActionWithSpecialCosts(p, c, targets, costFunc)
-}
 
-func NewPlayActionWithSpecialCosts(p *Player, c *Card, targets interface{},
-	costFunc func(*State) bool,
-) Action {
+	if a.costFunc == nil {
+		a.costFunc = func(*State) bool {
+			cost := c.PlayCosts()
+
+			if p.Resource < cost {
+				return false
+			}
+			p.Resource -= cost
+			return true
+		}
+	}
+
+	s := p.gameState
+	if c.IsPermanent() {
+		a.targets = newTargets(s, []string{permanentPlayActionTarget}, a)
+	} else {
+		a.targets = newTargets(s, []string{}, a)
+	}
+
 	p.Hand.RemoveCard(c)
 
-	resolveFunc := func(s *State) {
-		s.ResolvePlay(p, c, targets)
+	a.resolveFunc = func(s *State) {
+		s.resolvePlay(p, c, a.targets)
 	}
 
-	desc := fmt.Sprintf("play %s@%v", c.Name, targets)
-	return &PlayAction{ActionBase{p, c, targets, resolveFunc, costFunc, desc}}
+	return a
 }
 
-type MoveAction struct {
-	ActionBase
-}
+func (a *PlayAction) String() string {
+	p := a.source.(*Player)
+	if a.targets.RequireTargets() {
+		return fmt.Sprintf(" %s play %s", p.Name, a.Card.Name)
+	}
 
-type MoveActionPrototype struct {
-	Unit *Unit
+	return fmt.Sprintf("%s play %s@%v", p.Name, a.Card.Name, a.targets)
 }
 
-func NewMoveActionPrototype(u *Unit) *MoveActionPrototype {
-	return &MoveActionPrototype{u}
+type MoveAction struct {
+	ActionBase
 }
 
-func (proto *MoveActionPrototype) String() string {
-	return fmt.Sprintf("move %s", proto.Unit.Movement.String())
-}
+const moveActionTargetDesc = "available tile"
+
+func NewMoveAction(u *Unit) *MoveAction {
+	a := &MoveAction{
+		ActionBase{
+			source: u,
+			Card:   u.Card(),
+		},
+	}
 
-func (proto *MoveActionPrototype) Specialize(s *State, args ...interface{}) Action {
-	target := args[0].(*Tile)
-	u := proto.Unit
+	a.targets = newTargets(u.Controller().gameState, []string{moveActionTargetDesc}, a)
 
-	resolveFunc := func(s *State) {
-		u.move(s, target)
+	a.resolveFunc = func(s *State) {
+		tile := a.targets.sel[0].(*Tile)
+		u.move(s, tile)
 	}
 
-	costFunc := func(*State) bool {
+	a.costFunc = func(*State) bool {
 		if u.AvailMoveActions < 1 {
 			return false
 		}
@@ -122,35 +152,38 @@ func (proto *MoveActionPrototype) Specialize(s *State, args ...interface{}) Acti
 		return true
 	}
 
-	desc := fmt.Sprintf("-> %s", target.Position.String())
-	return &MoveAction{ActionBase{u, u.Card(), target, resolveFunc, costFunc, desc}}
+	return a
 }
 
-type AttackAction struct {
-	ActionBase
-}
+func (a *MoveAction) String() string {
+	u := a.source.(*Unit)
+	if a.targets.RequireTargets() {
+		return fmt.Sprintf("move %s", u.Movement.String())
+	}
 
-type AttackActionPrototype struct {
-	Unit *Unit
+	t := a.targets.sel[0].(*Tile)
+	return fmt.Sprintf("%s: %s -> %s", u.Controller().Name, u.Card().Name, t.Position.String())
 }
 
-func NewAttackActionPrototype(u *Unit) *AttackActionPrototype {
-	return &AttackActionPrototype{u}
+type AttackAction struct {
+	ActionBase
 }
 
-func (proto *AttackActionPrototype) String() string {
-	return fmt.Sprintf("attack %s", proto.Unit.Attack.String())
-}
+const attackActionTargetDesc = "attackable permanent"
+
+func NewAttackAction(u *Unit) *AttackAction {
+	a := &AttackAction{ActionBase{
+		source: u,
+		Card:   u.Card(),
+	}}
 
-func (proto *AttackActionPrototype) Specialize(s *State, args ...interface{}) Action {
-	target := args[0].(Permanent)
-	u := proto.Unit
+	a.targets = newTargets(u.Controller().gameState, []string{attackActionTargetDesc}, a)
 
-	resolveFunc := func(s *State) {
-		s.Fight(u, target)
+	a.resolveFunc = func(s *State) {
+		s.Fight(u, a.targets.sel[0].(Permanent))
 	}
 
-	costFunc := func(*State) bool {
+	a.costFunc = func(*State) bool {
 		if u.AvailAttackActions < 1 {
 			return false
 		}
@@ -158,27 +191,41 @@ func (proto *AttackActionPrototype) Specialize(s *State, args ...interface{}) Ac
 		return true
 	}
 
-	desc := fmt.Sprintf("x %s", target.Tile().Position.String())
-	return &AttackAction{ActionBase{u, u.Card(), target, resolveFunc, costFunc, desc}}
+	return a
 }
 
-type FullActionPrototype struct {
-	Unit                 *Unit
-	resolveFuncPrototype func(*State, *Unit) func(*State)
-}
+func (a *AttackAction) String() string {
+	u := a.source.(*Unit)
+	if a.targets.RequireTargets() {
+		return fmt.Sprintf("attack %s", u.Attack.String())
+	}
 
-func NewFullActionPrototype(u *Unit, proto func(*State, *Unit) func(*State)) *FullActionPrototype {
-	return &FullActionPrototype{u, proto}
+	target := a.targets.sel[0].(Permanent)
+	return fmt.Sprintf("%s: %s x %s",
+		u.Controller().Name, u.Card().Name, target.Tile().Position.String())
 }
 
-func (proto *FullActionPrototype) String() string {
-	return "full_action"
+type FullAction struct {
+	ActionBase
+	desc string
 }
 
-func (proto *FullActionPrototype) Specialize(s *State, args ...interface{}) Action {
-	u := proto.Unit
-	resolveFunc := proto.resolveFuncPrototype(s, u)
-	costFunc := func(*State) bool {
+func NewFullAction(u *Unit, proto ActionFuncPrototype, desc string) *FullAction {
+	a := &FullAction{
+		ActionBase{
+			source: u,
+			Card:   u.Card(),
+		},
+
+		desc,
+	}
+
+	a.resolveFunc = func(s *State) {
+		rf := proto(a)
+		rf(s)
+	}
+
+	a.costFunc = func(*State) bool {
 		if u.AvailAttackActions < 1 && u.AvailMoveActions < 1 {
 			return false
 		}
@@ -186,28 +233,50 @@ func (proto *FullActionPrototype) Specialize(s *State, args ...interface{}) Acti
 		u.AvailMoveActions--
 		return true
 	}
-	desc := "full_action"
-	return &ActionBase{u, u.Card(), nil, resolveFunc, costFunc, desc}
-}
-
-type FreeActionPrototype struct {
-	Permanent Permanent
+	return a
 }
 
-func (proto *FreeActionPrototype) String() string {
-	return "free_action"
-}
+func (a *FullAction) String() string {
+	u := a.source.(*Unit)
+	if a.targets.RequireTargets() {
+		return fmt.Sprintf("↻ %s", a.desc)
+	}
 
-func (proto *FreeActionPrototype) Specialize(s *State, args ...interface{}) Action {
-	p := proto.Permanent
-	resolveFunc := args[0].(func(s *State))
-	costFunc := args[1].(func(s *State) bool)
-	desc := "free_action"
-	return &FreeAction{ActionBase{p, p.Card(), nil, resolveFunc, costFunc, desc}}
+	return fmt.Sprintf("%s: %s ↻@%s", u.Controller(), u.Card().Name, a.targets)
 }
 
 type FreeAction struct {
 	ActionBase
+	desc string
+}
+
+func NewFreeAction(p Permanent, resolveProto ActionFuncPrototype, costFunc ActionCostFunc,
+	desc string,
+) *FreeAction {
+	a := &FreeAction{
+		ActionBase{
+			source:   p,
+			Card:     p.Card(),
+			costFunc: costFunc,
+		},
+		desc,
+	}
+
+	a.resolveFunc = func(s *State) {
+		rf := resolveProto(a)
+		rf(s)
+	}
+
+	return a
+}
+
+func (a *FreeAction) String() string {
+	p := a.source.(Permanent)
+	if a.targets.RequireTargets() {
+		return fmt.Sprintf("free_action %s", a.desc)
+	}
+
+	return fmt.Sprintf("%s: %s free_action@%s", p.Controller(), p.Card().Name, a.targets)
 }
 
 type BuyAction struct {
@@ -215,6 +284,18 @@ type BuyAction struct {
 	card   *Card
 }
 
+func (a *BuyAction) Source() interface{} {
+	return a.player
+}
+
+func (a *BuyAction) Targets() *Targets {
+	return newTargetsWithSel(a.player.gameState, []string{"store cards"}, a, []interface{}{a.card})
+}
+
+func (a *BuyAction) CheckTargets(s *State) error {
+	return s.isValidBuy(a)
+}
+
 func (a *BuyAction) Resolve(s *State) {
 	a.player.Store.MoveCard(a.card, a.player.DiscardPile)
 }
diff --git a/go/game/ai.go b/go/game/ai.go
index 01820a19..0adce722 100644
--- a/go/game/ai.go
+++ b/go/game/ai.go
@@ -138,17 +138,18 @@ func moveToRandomTile(ai *UnitAI) Action {
 		return nil
 	}
 
-	moveTargets := ai.u.MoveRangeTiles(ai.s.Map)
-	if len(moveTargets) == 0 {
+	a := NewMoveAction(ai.u)
+	options := a.Targets().NextOptions()
+	if len(options) == 0 {
 		return nil
 	}
 
 	idx := 0
-	if len(moveTargets) > 1 {
-		idx = ai.s.Rand.Intn(len(moveTargets) - 1)
+	if len(options) > 1 {
+		idx = ai.s.Rand.Intn(len(options) - 1)
 	}
-	moveTarget := moveTargets[idx]
-	a := NewMoveActionPrototype(ai.u).Specialize(ai.s, moveTarget)
+	a.Targets().AddTarget(options[idx])
+
 	return a
 }
 
@@ -191,22 +192,28 @@ func moveTowardsNearestEnemyUnit(ai *UnitAI) Action {
 			break
 		}
 	}
-	a := NewMoveActionPrototype(ai.u).Specialize(ai.s, ai.s.Map.TileAt(target))
+
+	a := NewMoveAction(ai.u)
+	a.Targets().AddTarget(ai.s.Map.TileAt(target))
 	return a
 }
 
 func attackAttackableEnemyPerm(ai *UnitAI) Action {
-	attackablePerms := ai.u.AttackableEnemyPermanents(ai.s.Map)
-	if ai.u.AvailAttackActions == 0 || len(attackablePerms) == 0 {
+	if ai.u.AvailAttackActions == 0 {
+		return nil
+	}
+
+	a := NewAttackAction(ai.u)
+	options := a.Targets().NextOptions()
+	if len(options) == 0 {
 		return nil
 	}
 
 	idx := 0
-	if len(attackablePerms) > 1 {
-		idx = ai.s.Rand.Intn(len(attackablePerms) - 1)
+	if len(options) > 1 {
+		idx = ai.s.Rand.Intn(len(options) - 1)
 	}
-	attackablePerm := attackablePerms[idx]
-	a := NewAttackActionPrototype(ai.u).Specialize(ai.s, attackablePerm)
+	a.Targets().AddTarget(options[idx])
 	return a
 }
 
@@ -263,12 +270,18 @@ out:
 		}
 	}
 	if !inEnemyAttackRange && ai.u.HasFullAction() {
-		fullActions := ai.u.Card().Impl.fullActionPrototypes(ai.u)
+		fullActions := ai.u.Card().Impl.fullActions(ai.u)
 		idx := 0
 		if len(fullActions) > 1 {
 			idx = ai.s.Rand.Intn(len(fullActions) - 1)
 		}
-		a := fullActions[idx].Specialize(ai.s, ai.u)
+
+		a := fullActions[idx]
+		options := a.Targets().NextOptions()
+		if len(options) > 1 {
+			idx = ai.s.Rand.Intn(len(options) - 1)
+		}
+		a.Targets().AddTarget(options[idx])
 		ai.actions <- a
 	}
 
diff --git a/go/game/artifact.go b/go/game/artifact.go
index 23b653a6..acbaeb74 100644
--- a/go/game/artifact.go
+++ b/go/game/artifact.go
@@ -46,6 +46,6 @@ func (a *Artifact) Attackable() bool {
 	return a.Solid > 0
 }
 
-func (a *Artifact) AvailActionPrototypes() []ActionPrototype {
-	return []ActionPrototype{}
+func (a *Artifact) AvailActions() []Action {
+	return []Action{}
 }
diff --git a/go/game/card.go b/go/game/card.go
index d4515676..9013a059 100644
--- a/go/game/card.go
+++ b/go/game/card.go
@@ -73,8 +73,8 @@ var CardTypeNames = map[string]CardType{
 
 type cardImplementation interface {
 	spawnTiles(*State, *Player) []*Tile
-	fullActionPrototypes(*Unit) []*FullActionPrototype
-	freeActionPrototypes(Permanent) []*FreeActionPrototype
+	fullActions(*Unit) []*FullAction
+	freeActions(Permanent) []*FreeAction
 }
 
 // Default implementation of the cardImplementation interface.
@@ -87,11 +87,11 @@ func (impl *cardImplementationBase) spawnTiles(*State, *Player) []*Tile {
 	return nil
 }
 
-func (impl *cardImplementationBase) fullActionPrototypes(*Unit) []*FullActionPrototype {
+func (impl *cardImplementationBase) fullActions(*Unit) []*FullAction {
 	return nil
 }
 
-func (impl *cardImplementationBase) freeActionPrototypes(Permanent) []*FreeActionPrototype {
+func (impl *cardImplementationBase) freeActions(Permanent) []*FreeAction {
 	return nil
 }
 
diff --git a/go/game/cardImplementations.go b/go/game/cardImplementations.go
index d1f8de70..8024e4fc 100644
--- a/go/game/cardImplementations.go
+++ b/go/game/cardImplementations.go
@@ -8,8 +8,9 @@ type advisorImplementation struct {
 	cardImplementationBase
 }
 
-func (impl *advisorImplementation) fullActionPrototypes(u *Unit) []*FullActionPrototype {
-	resolvePrototype := func(s *State, u *Unit) func(*State) {
+func (impl *advisorImplementation) fullAction(u *Unit) []*FullAction {
+	resolvePrototype := func(a Action) ActionResolveFunc {
+		u := a.Source().(*Unit)
 		return func(s *State) {
 			controller := u.Controller()
 			controller.DrawN(1)
@@ -19,12 +20,36 @@ func (impl *advisorImplementation) fullActionPrototypes(u *Unit) []*FullActionPr
 			}
 		}
 	}
-	return []*FullActionPrototype{NewFullActionPrototype(u, resolvePrototype)}
+	return []*FullAction{NewFullAction(u, resolvePrototype, "draw 1. exile 1")}
+}
+
+type missionaryImplementation struct {
+	cardImplementationBase
+}
+
+func (impl *missionaryImplementation) fullAction(u *Unit) []*FullAction {
+	resolvePrototype := func(a Action) ActionResolveFunc {
+		u := a.Source().(*Unit)
+		target := a.Targets().sel[0].(*Unit)
+		return func(s *State) {
+			faith, found := target.States[UnitMarks.Faith]
+			if !found {
+				target.States[UnitMarks.Faith] = 2
+			} else {
+				target.States[UnitMarks.Faith] = faith + 2
+				if faith+2 > target.Card().BuyCost {
+					target.controller = u.Controller()
+				}
+			}
+		}
+	}
+	return []*FullAction{NewFullAction(u, resolvePrototype, "put faith ...")}
 }
 
 func init() {
 	cardImplementations = map[string]cardImplementation{
-		"base/advisor": &advisorImplementation{},
+		"base/advisor":    &advisorImplementation{},
+		"base/missionary": &missionaryImplementation{},
 
 		"misc/farmer": &farmerImplementation{},
 	}
diff --git a/go/game/cardParsing.go b/go/game/cardParsing.go
index 3a316c4f..afdefe54 100644
--- a/go/game/cardParsing.go
+++ b/go/game/cardParsing.go
@@ -8,10 +8,10 @@ import (
 )
 
 type parsedCardImplementation struct {
-	card                    *Card
-	spawnTilesFunc          func(*State, *Player) []*Tile
-	genFullActionPrototypes func(*Unit) []*FullActionPrototype
-	genFreeActionPrototypes func(Permanent) []*FreeActionPrototype
+	card           *Card
+	spawnTilesFunc func(*State, *Player) []*Tile
+	genFullActions func(*Unit) []*FullAction
+	genFreeActions func(Permanent) []*FreeAction
 }
 
 func (impl *parsedCardImplementation) spawnTiles(s *State, p *Player) []*Tile {
@@ -21,16 +21,16 @@ func (impl *parsedCardImplementation) spawnTiles(s *State, p *Player) []*Tile {
 	return nil
 }
 
-func (impl *parsedCardImplementation) fullActionPrototypes(u *Unit) []*FullActionPrototype {
-	if impl.genFullActionPrototypes != nil {
-		return impl.genFullActionPrototypes(u)
+func (impl *parsedCardImplementation) fullActions(u *Unit) []*FullAction {
+	if impl.genFullActions != nil {
+		return impl.genFullActions(u)
 	}
 	return nil
 }
 
-func (impl *parsedCardImplementation) freeActionPrototypes(p Permanent) []*FreeActionPrototype {
-	if impl.genFreeActionPrototypes != nil {
-		return impl.genFreeActionPrototypes(p)
+func (impl *parsedCardImplementation) freeActions(p Permanent) []*FreeAction {
+	if impl.genFreeActions != nil {
+		return impl.genFreeActions(p)
 	}
 	return nil
 }
@@ -55,7 +55,7 @@ func (impl *parsedCardImplementation) parseEffect(effect string) {
 }
 
 func (impl *parsedCardImplementation) parseFullAction(fullAction string) {
-	var resolveProtos []func(*State, *Unit) func(*State)
+	var resolveProtos []ActionFuncPrototype
 	gainRessourceRegex := regexp.MustCompile(`gain [1-9][0-9]* resource`)
 
 	if find := gainRessourceRegex.Find([]byte(fullAction)); find != nil {
@@ -65,7 +65,8 @@ func (impl *parsedCardImplementation) parseFullAction(fullAction string) {
 			log.Fatalf("Failed to parse resource gain full action: %s", err)
 		}
 
-		resolveProto := func(_ *State, u *Unit) func(*State) {
+		resolveProto := func(a Action) ActionResolveFunc {
+			u := a.Source().(*Unit)
 			return func(*State) {
 				u.controller.gainResource(gain)
 			}
@@ -74,14 +75,14 @@ func (impl *parsedCardImplementation) parseFullAction(fullAction string) {
 	}
 
 	if resolveProtos != nil {
-		impl.genFullActionPrototypes = func(u *Unit) []*FullActionPrototype {
-			fullActionPrototypes := make([]*FullActionPrototype, 0, len(resolveProtos))
+		impl.genFullActions = func(u *Unit) []*FullAction {
+			fullActions := make([]*FullAction, 0, len(resolveProtos))
 
 			for _, proto := range resolveProtos {
-				fullActionPrototypes = append(fullActionPrototypes, NewFullActionPrototype(u, proto))
+				fullActions = append(fullActions, NewFullAction(u, proto, ""))
 			}
 
-			return fullActionPrototypes
+			return fullActions
 		}
 	}
 }
diff --git a/go/game/kraken.go b/go/game/kraken.go
index 6ea22876..19adfd3c 100644
--- a/go/game/kraken.go
+++ b/go/game/kraken.go
@@ -10,23 +10,21 @@ const (
 	KRAKEN_NAME = "Kraken"
 )
 
-// var KrakenDecklist = `2 kraken/angry_squid
-// 2 kraken/chachalot
-// 2 kraken/clownfish
-// 2 kraken/deja_vu!
-// 2 kraken/devour_the_poor!
-// 2 kraken/dolphin
-// 2 kraken/flying_dutchmen
-// 2 kraken/frost_pylon
-// 2 kraken/gigantic_hail
-// 2 kraken/sailfish
-// 2 kraken/sold_out!
-// 2 kraken/suprise!
-// 2 kraken/tentacle_slap
-// 2 kraken/tides_change!
-// 2 kraken/unholy_cannonball`
-
-var KrakenDecklist = `2 kraken/clownfish`
+var KrakenDecklist = `2 kraken/angry_squid
+2 kraken/chachalot
+2 kraken/clownfish
+2 kraken/deja_vu!
+2 kraken/devour_the_poor!
+2 kraken/dolphin
+2 kraken/flying_dutchmen
+2 kraken/frost_pylon
+2 kraken/gigantic_hail
+2 kraken/sailfish
+2 kraken/sold_out!
+2 kraken/suprise!
+2 kraken/tentacle_slap
+2 kraken/tides_change!
+2 kraken/unholy_cannonball`
 
 func NewKraken(id int, s *State) *Player {
 	kraken := NewPlayer(id, KRAKEN_NAME, NewDeck(), s)
@@ -88,6 +86,7 @@ func (ctrl *KrakenControl) krakenTurn() {
 		log.Fatalf("Ai turn out of sync %d != %d", ctrl.turn, kraken.Turn)
 	}
 
+turn:
 	for {
 		drawn := kraken.Deck.Draw(1)
 		if len(drawn) == 0 {
@@ -107,23 +106,23 @@ func (ctrl *KrakenControl) krakenTurn() {
 			return true
 		}
 
-		// TODO: select targets
-		var targets interface{}
-		if c.IsPermanent() {
-			spawns := s.AvailableSpawnTiles(kraken, c)
-			if len(spawns) == 0 {
-				log.Println("No spawn available for", c.Name)
+		a := NewPlayAction(kraken, c, costFunc)
+		for a.Targets().RequireTargets() {
+			options := a.Targets().NextOptions()
+			if len(options) == 0 {
+				log.Println("No target available for", c.Name)
 				kraken.DiscardPile.AddCard(c)
-				continue
+				continue turn
 			}
 
 			idx := 0
-			if len(spawns) > 1 {
-				idx = s.Rand.Intn(len(spawns) - 1)
+			if len(options) > 1 {
+				idx = s.Rand.Intn(len(options) - 1)
 			}
-			targets = spawns[idx].Position
+			a.Targets().AddTarget(options[idx])
 		}
-		ctrl.actions <- NewPlayActionWithSpecialCosts(kraken, c, targets, costFunc)
+
+		ctrl.actions <- a
 		ctrl.awaitGameStateSync()
 	}
 
diff --git a/go/game/permanent.go b/go/game/permanent.go
index 21655d71..b4090592 100644
--- a/go/game/permanent.go
+++ b/go/game/permanent.go
@@ -25,7 +25,8 @@ type Permanent interface {
 	AddDamage(damage int)
 	IsDestroyed() bool
 	Attackable() bool
-	AvailActionPrototypes() []ActionPrototype
+	AvailActions() []Action
+	IsAvailableTile(*Tile) bool
 }
 
 type PermanentBase struct {
@@ -124,3 +125,7 @@ func (p *PermanentBase) XEffect(effect string) (int, error) {
 
 	return x, err
 }
+
+func (p *PermanentBase) IsAvailableTile(tile *Tile) bool {
+	return tile.IsAvailableForCard(p.card)
+}
diff --git a/go/game/state.go b/go/game/state.go
index 816fc0d0..1d4b644f 100644
--- a/go/game/state.go
+++ b/go/game/state.go
@@ -102,11 +102,10 @@ func (s *State) IsValidPlay(a *PlayAction) error {
 	}
 
 	if a.Card.IsPermanent() {
-		pos := a.Targets.(Position)
-		spawn := s.Map.TileAt(pos)
-		if !slices.Contains(s.AvailableSpawnTiles(a.Source.(*Player), a.Card), spawn) {
+		spawn := a.Targets().sel[0].(*Tile)
+		if !slices.Contains(s.AvailableSpawnTiles(a.Source().(*Player), a.Card), spawn) {
 			return fmt.Errorf("Spawn %v is not a valid spawn tile for %s",
-				pos.String(), a.Card.Name)
+				spawn.Position.String(), a.Card.Name)
 		}
 	}
 
@@ -118,8 +117,8 @@ func (s *State) IsValidMove(a *MoveAction) error {
 		return fmt.Errorf("Move actions can only be declared during one's actions phase")
 	}
 
-	u := a.Source.(*Unit)
-	tile := a.Targets.(*Tile)
+	u := a.Source().(*Unit)
+	tile := a.Targets().sel[0].(*Tile)
 
 	if !slices.Contains(u.MoveRangeTiles(s.Map), tile) {
 		return fmt.Errorf("Unit %s at %s can not move to %s",
@@ -139,16 +138,12 @@ func (s *State) IsValidAttack(a *AttackAction) error {
 		return fmt.Errorf("Attack actions can only be declared during one's actions phase")
 	}
 
-	unit := a.Source.(Unit)
+	unit := a.Source().(Unit)
 	if unit.Attack == INVALID_ATTACK() {
 		return fmt.Errorf("%s can not attack", unit.card.Name)
 	}
 
-	target := a.Targets.(Permanent)
-	if !target.Attackable() {
-		return fmt.Errorf("Target %s is not attackable", target.Tile().Position.String())
-	}
-
+	target := a.Targets().sel[0].(Permanent)
 	if !IsPositionInRange(unit.tile.Position, target.Tile().Position, unit.Attack.Range) {
 		return fmt.Errorf("Attack target on %s is not in attack range %d of %s on %s",
 			target.Tile().Position.String(), unit.Attack.Range, unit.card.Name,
@@ -158,7 +153,7 @@ func (s *State) IsValidAttack(a *AttackAction) error {
 	return nil
 }
 
-func (s *State) IsValidBuy(a *BuyAction) error {
+func (s *State) isValidBuy(a *BuyAction) error {
 	if s.Map.HasStores() {
 		var storeTiles []*Tile
 		for pos, store := range s.Map.Stores {
@@ -189,8 +184,12 @@ func (s *State) IsValidBuy(a *BuyAction) error {
 	return nil
 }
 
-func (s *State) ValidateAction(a Action) error {
-	var err error = nil
+func (s *State) ValidateAction(a Action) (err error) {
+	err = a.CheckTargets(s)
+	if err != nil {
+		return
+	}
+
 	switch a := a.(type) {
 	case *PlayAction:
 		err = s.IsValidPlay(a)
@@ -199,9 +198,9 @@ func (s *State) ValidateAction(a Action) error {
 	case *AttackAction:
 		err = s.IsValidAttack(a)
 	case *BuyAction:
-		err = s.IsValidBuy(a)
 	}
-	return err
+
+	return
 }
 
 func (s *State) PushAction(a Action) {
@@ -214,18 +213,23 @@ func (s *State) PushAction(a Action) {
 
 func (s *State) DeclareAction(a Action) {
 	var err error = nil
-	switch a := a.(type) {
-	case *BuyAction:
-		if s.ActivePhase != Phases.BuyPhase {
-			err = fmt.Errorf("Cards can only be bought during one's buy phase")
-		}
-		if !a.card.IsBuyable() {
-			err = fmt.Errorf("Card %s is not buyable", a.card.Name)
-		}
-	case *FreeAction:
-	default:
-		if !s.Stack.IsEmpty() {
-			err = fmt.Errorf("Slow action can not be declared while other actions are on the stack")
+
+	err = a.CheckTargets(s)
+
+	if err != nil {
+		switch a := a.(type) {
+		case *BuyAction:
+			if s.ActivePhase != Phases.BuyPhase {
+				err = fmt.Errorf("Cards can only be bought during one's buy phase")
+			}
+			if !a.card.IsBuyable() {
+				err = fmt.Errorf("Card %s is not buyable", a.card.Name)
+			}
+		case *FreeAction:
+		default:
+			if !s.Stack.IsEmpty() {
+				err = fmt.Errorf("Slow action can not be declared while other actions are on the stack")
+			}
 		}
 	}
 
@@ -367,12 +371,14 @@ func (s *State) EnemyUnits(player *Player) []*Unit {
 	})
 }
 
-func (s *State) ResolvePlay(p *Player, c *Card, targets interface{}) {
+func (s *State) resolvePlay(p *Player, c *Card, targets *Targets) {
 	switch c.Type {
 	case CardTypes.Unit:
-		s.AddNewUnit(c, targets.(Position), p)
+		tile := targets.sel[0].(*Tile)
+		s.AddNewUnit(c, tile.Position, p)
 	case CardTypes.Artifact:
-		s.AddNewArtifact(c, targets.(Position), p)
+		tile := targets.sel[0].(*Tile)
+		s.AddNewArtifact(c, tile.Position, p)
 	default:
 		log.Printf("Resolving unhandled card type: %s\n", c.Type.String())
 	}
diff --git a/go/game/targets.go b/go/game/targets.go
new file mode 100644
index 00000000..1a8c7ab3
--- /dev/null
+++ b/go/game/targets.go
@@ -0,0 +1,307 @@
+package game
+
+import (
+	"fmt"
+	"log"
+	"strconv"
+	"strings"
+
+	"golang.org/x/exp/slices"
+	"muhq.space/muhqs-game/go/utils"
+)
+
+type (
+	TargetConstrainFunc func(interface{}) error
+	TargetConstrain     struct {
+		desc      string
+		constrain TargetConstrainFunc
+	}
+)
+
+type Targets struct {
+	s          *State
+	action     Action
+	constrains []*TargetConstrain
+	sel        []interface{}
+}
+
+func fmtSel(sel interface{}) string {
+	switch t := sel.(type) {
+	case *Tile:
+		return t.Position.String()
+	default:
+		return fmt.Sprintf("%d", t)
+	}
+}
+
+func (t *Targets) String() string {
+	if len(t.sel) == 0 {
+		return "undecided targets"
+	}
+
+	if len(t.sel) == 1 {
+		return fmt.Sprintf("%s", fmtSel(t.sel[0]))
+	}
+
+	s := "["
+	for _, sel := range t.sel {
+		s += fmt.Sprintf("%s ", fmtSel(sel))
+	}
+	return s[:len(s)-1] + "]"
+}
+
+func newTargetsWithSel(s *State, targets []string, action Action, sel []interface{}) *Targets {
+	t := &Targets{
+		s:   s,
+		sel: sel,
+	}
+
+	t.buildConstrains(targets, action)
+	return t
+}
+
+func newTargets(s *State, targets []string, action Action) *Targets {
+	return newTargetsWithSel(s, targets, action, make([]interface{}, 0, len(targets)))
+}
+
+func (t *Targets) buildConstrains(targets []string, action Action) {
+	for _, desc := range targets {
+		c := &TargetConstrain{desc, targetConstrain(desc, t.s, action)}
+		t.constrains = append(t.constrains, c)
+	}
+}
+
+func (t *Targets) RequireTargets() bool {
+	return len(t.constrains) != len(t.sel)
+}
+
+func (t *Targets) Options() [][]interface{} {
+	options := make([][]interface{}, 0, len(t.constrains))
+	for _, c := range t.constrains {
+		options = append(options, c.options(t.s))
+	}
+	return options
+}
+
+func (t *Targets) NextOptions() []interface{} {
+	next := len(t.sel)
+	return t.constrains[next].options(t.s)
+}
+
+func (t *Targets) AddTarget(target interface{}) {
+	t.sel = append(t.sel, target)
+}
+
+func (t *Targets) CheckTargets(s *State) error {
+	if t.RequireTargets() {
+		return fmt.Errorf("Number of selected targets and required ones does not match")
+	}
+
+	for i, c := range t.constrains {
+		sel := t.sel[i]
+		if err := c.constrain(sel); err != nil {
+			return fmt.Errorf("selected target %s does not fit its desciption %s: %s",
+				sel, c.desc, err)
+		}
+	}
+
+	return nil
+}
+
+func targetConstrain(desc string, s *State, action Action) TargetConstrainFunc {
+	constrains := []TargetConstrainFunc{}
+	if strings.Contains(desc, "unit") {
+		constrains = append(constrains, parseUnitTargetConstrain(desc, s, action)...)
+	} else if strings.Contains(desc, "artifact") {
+		constrains = append(constrains, parseArtifactTargetConstrain(desc, s, action)...)
+	} else if strings.Contains(desc, "tile") {
+		constrains = append(constrains, parseTileTargetConstrain(desc, s, action)...)
+		// } else if strings.Contains("action") {
+		// contrains = append(contrains, parseActionTargetConstrain(desc, s, action)...)
+		// } else if strings.Contains("spell") {
+		// contrains = append(contrains, parseSpellTargetConstrain(desc, s, action)...)
+	}
+
+	return func(t interface{}) error {
+		for _, constrain := range constrains {
+			if err := constrain(t); err != nil {
+				return err
+			}
+		}
+
+		return nil
+	}
+}
+
+func enemyPermanentTargetConstrain(action Action) TargetConstrainFunc {
+	var sourceController *Player
+	switch source := action.Source().(type) {
+	case *Player:
+		sourceController = source
+	case Permanent:
+		sourceController = source.Controller()
+	default:
+		log.Fatalf("Unhandled source type %T in enemyPermanentTargetConstrain", source)
+	}
+
+	return func(t interface{}) (err error) {
+		p, _ := t.(Permanent)
+		if !p.Controller().IsEnemy(sourceController) {
+			err = fmt.Errorf("Controller %s of target %t is not an enemy of %s",
+				p.Controller(), t, sourceController)
+		}
+		return
+	}
+}
+
+func rangeTargetConstrain(source interface{}, r int) TargetConstrainFunc {
+	var sourcePos Position
+	switch source := source.(type) {
+	case *Tile:
+		sourcePos = source.Position
+	case Permanent:
+		sourcePos = source.Tile().Position
+	default:
+		log.Fatalf("Unhandled source type %T in rangeTargetConstrain", source)
+	}
+
+	return func(t interface{}) (err error) {
+		p, _ := t.(Permanent)
+		if !IsPositionInRange(sourcePos, p.Tile().Position, r) {
+			err = fmt.Errorf("Position %s of target %s not in range %d of source's position %s",
+				p.Tile().Position, t, r, sourcePos)
+		}
+		return
+	}
+}
+
+var unitTargetConstrain TargetConstrainFunc = func(t interface{}) (err error) {
+	_, ok := t.(*Unit)
+	if !ok {
+		err = fmt.Errorf("target is %T not *Unit", t)
+	}
+	return
+}
+
+func parseUnitTargetConstrain(desc string, s *State, action Action) []TargetConstrainFunc {
+	constrains := []TargetConstrainFunc{unitTargetConstrain}
+
+	if strings.Contains(desc, "enemy unit") {
+		constrains = append(constrains, enemyPermanentTargetConstrain(action))
+	}
+
+	if strings.Contains(desc, " in range ") {
+		tokens := strings.SplitN(desc, " in range ", 2)
+		r, err := strconv.Atoi(tokens[1])
+		if err != nil {
+			log.Fatalf("Invalid range %s in target constrain %s", tokens[1], desc)
+		}
+		constrains = append(constrains, rangeTargetConstrain(action, r))
+	}
+
+	return constrains
+}
+
+var artifactTargetConstrain TargetConstrainFunc = func(t interface{}) (err error) {
+	_, ok := t.(*Artifact)
+	if !ok {
+		err = fmt.Errorf("target is %T not *Artifact", t)
+	}
+	return
+}
+
+func parseArtifactTargetConstrain(constrain string, s *State, action Action) []TargetConstrainFunc {
+	constrains := []TargetConstrainFunc{artifactTargetConstrain}
+	return constrains
+}
+
+var tileTargetConstrain TargetConstrainFunc = func(t interface{}) (err error) {
+	_, ok := t.(*Tile)
+	if !ok {
+		err = fmt.Errorf("target is %T not *Tile", t)
+	}
+	return
+}
+
+func parseTileTargetConstrain(desc string, s *State, action Action) []TargetConstrainFunc {
+	log.Println("parsing", desc)
+	constrains := []TargetConstrainFunc{tileTargetConstrain}
+
+	if moveAction, ok := action.(*MoveAction); ok {
+		u := moveAction.Source().(*Unit)
+		constrains = append(constrains, func(t interface{}) (err error) {
+			tile := t.(*Tile)
+			if slices.Contains(u.MoveRangeTiles(s.Map), tile) {
+				return nil
+			}
+			return fmt.Errorf("tile %s is not in %d movement range", tile)
+		})
+	}
+
+	var player *Player
+	switch a := action.(type) {
+	case *PlayAction:
+		player = a.Source().(*Player)
+	}
+
+	var card *Card
+	switch a := action.(type) {
+	case *PlayAction:
+		card = a.Card
+	case *MoveAction:
+		card = a.Card
+	}
+
+	if strings.Contains(desc, "spawn") {
+		if player == nil {
+			log.Fatalf("Not implemented spawn tile constrain for %T", action)
+		}
+
+		constrains = append(constrains, func(t interface{}) (err error) {
+			tile := t.(*Tile)
+			if slices.Contains(s.AvailableSpawnTiles(player, card), tile) {
+				return nil
+			}
+			return fmt.Errorf("tile %s is no spawn tile", tile)
+		})
+	}
+
+	if strings.Contains(desc, "available") {
+		constrains = append(constrains, func(t interface{}) (err error) {
+			tile := t.(*Tile)
+
+			if card == nil {
+				log.Fatalf("Not implemented availability tile constrain for %T", action)
+			}
+
+			if tile.IsAvailableForCard(card) {
+				return nil
+			}
+			return fmt.Errorf("tile %s is not available for %s", tile, card.Name)
+		})
+	}
+
+	return constrains
+}
+
+func (c *TargetConstrain) options(s *State) (options []interface{}) {
+	candidates := targetCandidates(c.desc, s)
+
+	for _, candidate := range candidates {
+		if err := c.constrain(candidate); err == nil {
+			options = append(options, candidate)
+		}
+	}
+	return
+}
+
+func targetCandidates(desc string, s *State) []interface{} {
+	if strings.Contains(desc, "unit") || strings.Contains(desc, "artifact") {
+		return utils.TypedSliceToInterfaceSlice(s.Permanents)
+	} else if strings.Contains(desc, "tile") {
+		return utils.TypedSliceToInterfaceSlice(s.Map.AllTiles())
+	}
+
+	log.Fatalf("Unimplemented target options for %s", desc)
+	return nil
+}
diff --git a/go/game/tile.go b/go/game/tile.go
index 06af795c..260747d1 100644
--- a/go/game/tile.go
+++ b/go/game/tile.go
@@ -1,6 +1,7 @@
 package game
 
 import (
+	"fmt"
 	"strings"
 )
 
@@ -78,6 +79,10 @@ type Tile struct {
 	Raw       string
 }
 
+func (t *Tile) String() string {
+	return fmt.Sprintf("%d@%d", t.Type, t.Position.String())
+}
+
 func INVALID_TILE() Tile {
 	return Tile{INVALID_POSITION(), nil, 0, false, ""}
 }
diff --git a/go/game/unit.go b/go/game/unit.go
index f4f7d9cc..2bc90992 100644
--- a/go/game/unit.go
+++ b/go/game/unit.go
@@ -1,24 +1,65 @@
 package game
 
-type UnitState int
+import (
+	"log"
+)
+
+type UnitMark int
 
 const (
-	Paralysis UnitState = iota + 1
-	Poison
-	Panic
-	Rage
-	Ward
+	paralysis UnitMark = iota + 1
+	poison
+	panic_
+	rage
+	ward
+	faith
 )
 
+func (mark UnitMark) String() string {
+	switch mark {
+	case paralysis:
+		return "paralysis"
+	case poison:
+		return "poison"
+	case panic_:
+		return "panic"
+	case rage:
+		return "rage"
+	case ward:
+		return "ward"
+	case faith:
+		return "faith"
+	default:
+		log.Fatalf("Unhandled unit mark %d", mark)
+		return ""
+	}
+}
+
+var UnitMarks = struct {
+	Paralysis UnitMark
+	Poison    UnitMark
+	Panic     UnitMark
+	Rage      UnitMark
+	Ward      UnitMark
+	Faith     UnitMark
+}{
+	Paralysis: paralysis,
+	Poison:    poison,
+	Panic:     panic_,
+	Rage:      rage,
+	Ward:      ward,
+	Faith:     faith,
+}
+
 type Unit struct {
 	PermanentBase
 	Health      int
 	Movement    Movement
 	Attack      Attack
 	Upkeep      int
-	FullActions []*FullActionPrototype
-	FreeActions []*FreeActionPrototype
-	States      []UnitState
+	FullActions []*FullAction
+	FreeActions []*FreeAction
+	States      map[UnitMark]int
 	// Effects []Effects
 	AvailMoveActions   int
 	AvailAttackActions int
@@ -52,12 +93,13 @@ func NewUnit(card *Card, tile *Tile, owner *Player) *Unit {
 		Movement:           movement,
 		Attack:             attack,
 		Upkeep:             upkeep,
+		States:             make(map[UnitMark]int),
 		AvailMoveActions:   1,
 		AvailAttackActions: 1,
 	}
 
-	u.FullActions = card.Impl.fullActionPrototypes(u)
-	u.FreeActions = card.Impl.freeActionPrototypes(u)
+	u.FullActions = card.Impl.fullActions(u)
+	u.FreeActions = card.Impl.freeActions(u)
 
 	tile.Permanent = u
 	return u
@@ -124,10 +166,6 @@ func (u *Unit) AttackableEnemyPermanents(m *Map) []Permanent {
 	return permanents
 }
 
-func (u *Unit) IsAvailableTile(tile *Tile) bool {
-	return tile.IsAvailableForCard(u.card)
-}
-
 func (u *Unit) Fight(p Permanent) {
 	DealDamage(u, p, u.Attack.Damage)
 }
@@ -147,26 +185,27 @@ func (u *Unit) HasFullAction() bool {
 func (u *Unit) FullAction() {
 }
 
-func (u *Unit) AvailActionPrototypes() []ActionPrototype {
-	prototypes := []ActionPrototype{}
+func (u *Unit) AvailActions() (actions []Action) {
 	if u.AvailMoveActions > 0 && u.Movement != INVALID_MOVEMENT() {
-		prototypes = append(prototypes, NewMoveActionPrototype(u))
+		actions = append(actions, NewMoveAction(u))
 	}
 
 	m := u.Controller().gameState.Map
 	if u.AvailAttackActions > 0 && u.Attack != INVALID_ATTACK() &&
 		len(u.AttackableEnemyPermanents(m)) > 0 {
 
-		prototypes = append(prototypes, NewAttackActionPrototype(u))
+		actions = append(actions, NewAttackAction(u))
 	}
 
-	for _, p := range u.FullActions {
-		prototypes = append(prototypes, p)
+	if u.AvailAttackActions > 0 && u.AvailMoveActions > 0 {
+		for _, p := range u.FullActions {
+			actions = append(actions, p)
+		}
 	}
 
 	for _, p := range u.FreeActions {
-		prototypes = append(prototypes, p)
+		actions = append(actions, p)
 	}
 
-	return prototypes
+	return actions
 }
diff --git a/go/ui/choice.go b/go/ui/choice.go
index 71308d1b..003c2a6a 100644
--- a/go/ui/choice.go
+++ b/go/ui/choice.go
@@ -59,7 +59,7 @@ func (c *Choice) Render() *ebiten.Image {
 	return nil
 }
 
-func NewActionChoice(x, y int, actions []game.ActionPrototype, onClick func(*Choice, int, int)) *Choice {
+func NewActionChoice(x, y int, actions []game.Action, onClick func(*Choice, int, int)) *Choice {
 	// TODO: use dynamic with width and height
 	width := 200
 	choiceHeight := 40
diff --git a/go/ui/scrollable.go b/go/ui/scrollable.go
new file mode 100644
index 00000000..90e0a3a5
--- /dev/null
+++ b/go/ui/scrollable.go
@@ -0,0 +1,5 @@
+package ui
+
+type Scrollable interface {
+	Scroll(x, y int)
+}
diff --git a/go/utils/slices.go b/go/utils/slices.go
new file mode 100644
index 00000000..d2bc04c1
--- /dev/null
+++ b/go/utils/slices.go
@@ -0,0 +1,9 @@
+package utils
+
+func TypedSliceToInterfaceSlice[T any](s []T) []interface{} {
+	is := make([]interface{}, 0, len(s))
+	for _, t := range s {
+		is = append(is, t)
+	}
+	return is
+}