From c696829f9e37e9f3752fdb89ebaadd4b3b237bea Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fischer@muhq.space>
Date: Sat, 2 Aug 2025 14:47:01 +0200
Subject: add support for flexible attacks

---
 go/game/unit.go | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

(limited to 'go/game/unit.go')

diff --git a/go/game/unit.go b/go/game/unit.go
index 463a1ad9..7032d464 100644
--- a/go/game/unit.go
+++ b/go/game/unit.go
@@ -122,6 +122,16 @@ func (u *Unit) MoveRangeTiles() []*Tile {
 	return tiles
 }
 
+func (u *Unit) AttackableTile(t *Tile) (bool, Attack) {
+	if flexAttack := u.Attack.flexAttack; flexAttack != nil {
+		if _, ok := flexAttack(u, t); ok {
+			return true, u.Attack
+		}
+	}
+
+	return IsPositionInRange(u.Tile().Position, t.Position, u.Attack.MaxRange()), u.Attack
+}
+
 func (u *Unit) AttackableTiles() []*Tile {
 	// Units not on the map can not attack
 	if u.tile == nil {
@@ -129,9 +139,14 @@ func (u *Unit) AttackableTiles() []*Tile {
 	}
 
 	m := u.controller.gameState.Map()
-	tilesInRange := TilesInRange(m, u, u.Attack.MaxRange())
-	if u.Attack.MaxRange() == 1 {
-		return tilesInRange
+	var tilesInRange []*Tile
+	if flexAttack := u.Attack.flexAttack; flexAttack != nil {
+		tilesInRange = m.FilterTiles(func(t *Tile) bool { _, ok := flexAttack(u, t); return ok })
+	} else {
+		tilesInRange = TilesInRange(m, u, u.Attack.MaxRange())
+		if u.Attack.MaxRange() == 1 {
+			return tilesInRange
+		}
 	}
 
 	// House tiles are not attackable from ranges > 1
@@ -169,8 +184,10 @@ func (u *Unit) AttackableEnemyPermanents() []Permanent {
 }
 
 func (u *Unit) fight(p Permanent) {
-	r := DistanceBetweenPermanents(p, u)
-	DealDamage(u, p, u.Attack.DamageInRange(r))
+	d, reachable := u.Attack.DamageForTile(u, p.Tile())
+	if reachable {
+		DealDamage(u, p, d)
+	}
 }
 
 func (u *Unit) IsDestroyed() bool {
@@ -202,7 +219,7 @@ func (u *Unit) AvailSlowActions() (actions []Action) {
 	}
 
 	m := u.Controller().gameState.Map()
-	if u.AvailAttackActions > 0 && !INVALID_ATTACK(u.Attack) &&
+	if u.AvailAttackActions > 0 && u.Attack.Valid() &&
 		len(u.AttackableEnemyPermanents()) > 0 {
 
 		actions = append(actions, NewAttackAction(u))
-- 
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