fix port ally finding bug, fix transport ship crashing game when target tile not found

src/core/PathFinding.ts

@@ -169,6 +169,13 @@ export class PathFinder {
     ) { }
 
     nextTile(curr: Tile, dst: Tile, dist: number = 1): TileResult {
+        if (curr == null) {
+            console.error('curr is null')
+        }
+        if (dst == null) {
+            console.error('dst is null')
+        }
+
         if (manhattanDist(curr.cell(), dst.cell()) < dist) {
             return { type: PathFindResultType.Completed, tile: curr }
         }

src/core/execution/FakeHumanExecution.ts

@@ -109,7 +109,7 @@ export class FakeHumanExecution implements Execution {
 
         const enemyborder = Array.from(this.player.borderTiles()).flatMap(t => t.neighbors()).filter(t => t.hasOwner() && t.owner() != this.player)
 
-        if (enemyborder.length == 0 || this.random.chance(5)) {
+        if (enemyborder.length == 0 || this.random.chance(1)) {
             this.sendBoat()
             return
         }

src/core/execution/PortExecution.ts

@@ -54,7 +54,7 @@ export class PortExecution implements Execution {
         for (const port of allPorts) {
             if (this.computingPaths.has(port)) {
                 const aStar = this.computingPaths.get(port)
-                switch(aStar.compute()) {
+                switch (aStar.compute()) {
                     case PathFindResultType.Completed:
                         this.portPaths.set(port, aStar.reconstructPath())
                         this.computingPaths.delete(port)
@@ -76,11 +76,10 @@ export class PortExecution implements Execution {
             }
         }
 
-        if (this.portPaths.size > 0 && this.random.chance(50)) {
-            const port = this.random.randElement(
-                Array.from(this.portPaths.keys())
-                    .filter(p => this.port.owner().isAlliedWith(p.owner()))
-            )
+        const allyPorts = Array.from(this.portPaths.keys())
+            .filter(p => this.port.owner().isAlliedWith(p.owner()))
+        if (allPorts.length > 0 && this.random.chance(50)) {
+            const port = this.random.randElement(allPorts)
             const path = this.portPaths.get(port)
             this.mg.addExecution(new TradeShipExecution(this._owner, this.port, port, path))
         }

src/core/execution/TransportShipExecution.ts

@@ -63,8 +63,13 @@ export class TransportShipExecution implements Execution {
 
         this.troops = Math.min(this.troops, this.attacker.troops())
 
-        const dstTile = targetTransportTile(this.mg, this.mg.tile(this.cell))
-        const src = this.attacker.canBuild(UnitType.TransportShip, dstTile)
+        this.dst = targetTransportTile(this.mg, this.mg.tile(this.cell))
+        if (this.dst == null) {
+            console.warn(`${this.attacker} cannot send ship to ${this.target}, cannot find attack tile`)
+            this.active = false
+            return
+        }
+        const src = this.attacker.canBuild(UnitType.TransportShip, this.dst)
         if (src == false) {
             console.warn(`can't build transport ship`)
             this.active = false
@@ -72,7 +77,6 @@ export class TransportShipExecution implements Execution {
         }
 
         this.src = src
-        this.dst = dstTile
 
         this.boat = this.attacker.buildUnit(UnitType.TransportShip, this.troops, this.src)
     }