Add finite prebattle shop stock

tools/validate_data.ps1

@@ -802,6 +802,41 @@ function Resolve-Shop-Item-Id($Entry, [string]$Context) {
     Fail "$Context has a malformed shop item entry."
 }
 
+function Check-Shop-Stock-Value($Value, [string]$Context) {
+    $isInteger = (
+        $Value -is [byte] -or
+        $Value -is [int16] -or
+        $Value -is [int] -or
+        $Value -is [long]
+    )
+    if (-not $isInteger -or [long]$Value -lt 0) {
+        Fail "$Context stock must be a non-negative integer."
+    }
+}
+
+function Check-Shop-Entry-Stock($Entry, [string]$ItemId, [string]$Context) {
+    if (-not (Has-Prop $Entry "stock")) {
+        return
+    }
+    Check-Shop-Stock-Value (Get-Prop $Entry "stock" $null) "$Context item $ItemId"
+}
+
+function Check-Shop-Stock-Block($Stock, $AllowedItemIds, [string]$Context) {
+    if ($null -eq $Stock -or $Stock -is [System.Array] -or $Stock -is [string] -or $Stock -is [ValueType]) {
+        Fail "$Context stock must be an object."
+    }
+    foreach ($prop in @($Stock.PSObject.Properties)) {
+        $itemId = [string]$prop.Name
+        if ([string]::IsNullOrWhiteSpace($itemId)) {
+            Fail "$Context stock has an empty item id."
+        }
+        if (-not $AllowedItemIds.Contains($itemId)) {
+            Fail "$Context stock references item outside that shop branch: $itemId"
+        }
+        Check-Shop-Stock-Value $prop.Value "$Context stock $itemId"
+    }
+}
+
 function Check-Shop($Shop, [string]$ScenarioId) {
     if ($null -eq $Shop) {
         return
@@ -831,11 +866,15 @@ function Check-Shop($Shop, [string]$ScenarioId) {
         if (-not $itemIds.Contains($itemId)) {
             Fail "Scenario $ScenarioId shop references unknown item: $itemId"
         }
+        Check-Shop-Entry-Stock $entry $itemId "Scenario $ScenarioId shop"
         $item = Find-Item-Def $itemId
         if ([int](Get-Prop $item "price" 0) -le 0) {
             Fail "Scenario $ScenarioId shop item $itemId has no positive price."
         }
     }
+    if (Has-Prop $Shop "stock") {
+        Check-Shop-Stock-Block $Shop.stock $seenShopItems "Scenario $ScenarioId shop"
+    }
 
     $conditionalItems = Get-Prop $Shop "conditional_items" @()
     foreach ($block in @($conditionalItems)) {
@@ -866,11 +905,15 @@ function Check-Shop($Shop, [string]$ScenarioId) {
             if (-not $itemIds.Contains($itemId)) {
                 Fail "Scenario $ScenarioId shop conditional_items references unknown item: $itemId"
             }
+            Check-Shop-Entry-Stock $entry $itemId "Scenario $ScenarioId shop conditional_items"
             $item = Find-Item-Def $itemId
             if ([int](Get-Prop $item "price" 0) -le 0) {
                 Fail "Scenario $ScenarioId shop conditional item $itemId has no positive price."
             }
         }
+        if (Has-Prop $block "stock") {
+            Check-Shop-Stock-Block $block.stock $seenConditionalItems "Scenario $ScenarioId shop conditional_items"
+        }
     }
 }