Add event inventory pickups

tools/validate_data.ps1

@@ -93,7 +93,7 @@ $validConditionTypes = @(
     "any"
 )
 $validTriggers = @("battle_start", "battle_begin", "turn_start", "unit_reaches_tile")
-$validActions = @("log", "dialogue", "set_objective", "spawn_deployment", "spawn_deployments")
+$validActions = @("log", "dialogue", "set_objective", "grant_item", "grant_items", "spawn_deployment", "spawn_deployments")
 $validEffects = @("heal_hp", "heal_mp", "cure_status")
 $validItemKinds = @("weapon", "armor", "accessory", "consumable")
 $validBonusStats = @("hp", "mp", "atk", "def", "int", "agi")
@@ -494,6 +494,32 @@ function Find-Item-Def([string]$ItemId) {
     return $prop.Value
 }
 
+function Resolve-Event-Grant-Item-Id($Entry, [string]$Context) {
+    if ($Entry -is [string]) {
+        return [string]$Entry
+    }
+    if ($null -eq $Entry -or $Entry -is [System.Array]) {
+        Fail "$Context has malformed item grant."
+    }
+    return [string](Get-Prop $Entry "item_id" (Get-Prop $Entry "id" ""))
+}
+
+function Check-Event-Grant-Item($Entry, [string]$Context) {
+    $itemId = Resolve-Event-Grant-Item-Id $Entry $Context
+    if ([string]::IsNullOrWhiteSpace($itemId)) {
+        Fail "$Context has empty item id."
+    }
+    if (-not $itemIds.Contains($itemId)) {
+        Fail "$Context references unknown item: $itemId"
+    }
+    if (-not ($Entry -is [string]) -and (Has-Prop $Entry "count")) {
+        $count = [int](Get-Prop $Entry "count" 0)
+        if ($count -le 0) {
+            Fail "$Context has invalid count for item $itemId."
+        }
+    }
+}
+
 function Check-Class-Equipment-Slots() {
     $weaponTypes = @()
     $armorTypes = @()
@@ -1556,6 +1582,19 @@ foreach ($scenario in $campaign.scenarios) {
                     Check-Dialogue-Line $action "Scenario $scenarioId event $eventId dialogue"
                 }
             }
+            if ($actionType -eq "grant_item") {
+                Check-Event-Grant-Item $action "Scenario $scenarioId event $eventId grant_item"
+            }
+            if ($actionType -eq "grant_items") {
+                $rawItems = Get-Prop $action "items" $null
+                $grantItems = @($rawItems)
+                if ($null -eq $rawItems -or $grantItems.Count -le 0) {
+                    Fail "Scenario $scenarioId event $eventId grant_items action has malformed items."
+                }
+                foreach ($entry in $grantItems) {
+                    Check-Event-Grant-Item $entry "Scenario $scenarioId event $eventId grant_items"
+                }
+            }
         }
     }