Add event prerequisite gates

tools/smoke_event_after_event.gd

@@ -0,0 +1,104 @@
+extends SceneTree
+
+const BattleStateScript := preload("res://scripts/core/battle_state.gd")
+
+
+func _init() -> void:
+	var failures: Array[String] = []
+	_check_manual_gate(failures)
+	_check_same_pass_gate(failures)
+
+	if failures.is_empty():
+		print("event after_event smoke ok")
+		quit(0)
+		return
+
+	for failure in failures:
+		push_error(failure)
+	quit(1)
+
+
+func _check_manual_gate(failures: Array[String]) -> void:
+	var state = _loaded_state(failures, "manual gate")
+	if state == null:
+		return
+	var logs := []
+	state.log_added.connect(func(message: String) -> void:
+		logs.append(message)
+	)
+	state.fired_event_ids.clear()
+	state.battle_events.clear()
+	state.battle_events.append({
+		"id": "dependent_report",
+		"once": true,
+		"when": {
+			"type": "turn_start",
+			"team": "player",
+			"turn": 1,
+			"after_event": "signal_ready"
+		},
+		"actions": [
+			{"type": "log", "text": "Dependent event fired."}
+		]
+	})
+
+	state._run_events("turn_start", "player", 1)
+	if logs.has("Dependent event fired."):
+		failures.append("after_event dependent fired before prerequisite")
+
+	state.fired_event_ids["signal_ready"] = true
+	state._run_events("turn_start", "player", 1)
+	if not logs.has("Dependent event fired."):
+		failures.append("after_event dependent did not fire after prerequisite")
+
+	logs.clear()
+	state._run_events("turn_start", "player", 1)
+	if logs.has("Dependent event fired."):
+		failures.append("after_event dependent repeated despite once flag")
+
+
+func _check_same_pass_gate(failures: Array[String]) -> void:
+	var state = _loaded_state(failures, "same pass gate")
+	if state == null:
+		return
+	var logs := []
+	state.log_added.connect(func(message: String) -> void:
+		logs.append(message)
+	)
+	state.fired_event_ids.clear()
+	state.battle_events.clear()
+	state.battle_events.append({
+		"id": "signal_ready",
+		"once": true,
+		"when": {"type": "turn_start", "team": "player", "turn": 1},
+		"actions": [
+			{"type": "log", "text": "Signal ready."}
+		]
+	})
+	state.battle_events.append({
+		"id": "dependent_report",
+		"once": true,
+		"when": {
+			"type": "turn_start",
+			"team": "player",
+			"turn": 1,
+			"after_event": "signal_ready"
+		},
+		"actions": [
+			{"type": "log", "text": "Dependent event fired."}
+		]
+	})
+
+	state._run_events("turn_start", "player", 1)
+	if not logs.has("Signal ready."):
+		failures.append("same-pass prerequisite did not fire")
+	if not logs.has("Dependent event fired."):
+		failures.append("same-pass dependent did not fire after prerequisite")
+
+
+func _loaded_state(failures: Array[String], label: String):
+	var state = BattleStateScript.new()
+	if not state.load_battle("res://data/scenarios/001_yellow_turbans.json"):
+		failures.append("%s could not load smoke scenario" % label)
+		return null
+	return state

tools/validate_data.ps1

@@ -1502,6 +1502,25 @@ function Check-Required-Flags($RequiredFlags, [string]$ScenarioId, [string]$Cont
     }
 }
 
+function Check-Event-After-Event($When, [string]$ScenarioId, [string]$EventId, $EventIds) {
+    if (-not (Has-Prop $When "after_event")) {
+        return
+    }
+    $afterEvent = [string](Get-Prop $When "after_event" "")
+    if ([string]::IsNullOrWhiteSpace($afterEvent)) {
+        Fail "Scenario $ScenarioId event $EventId has empty after_event."
+    }
+    if (-not ($afterEvent -match "^[a-z0-9_]+$")) {
+        Fail "Scenario $ScenarioId event $EventId has unstable after_event: $afterEvent"
+    }
+    if ($afterEvent -eq $EventId) {
+        Fail "Scenario $ScenarioId event $EventId cannot depend on itself."
+    }
+    if (-not $EventIds.Contains($afterEvent)) {
+        Fail "Scenario $ScenarioId event $EventId references missing after_event: $afterEvent"
+    }
+}
+
 function Check-Briefing($Briefing, [string]$ScenarioId) {
     if ($null -eq $Briefing) {
         return
@@ -1735,6 +1754,7 @@ foreach ($scenario in $campaign.scenarios) {
         if ($null -eq $when -or $when -is [string] -or $when -is [System.Array]) {
             Fail "Scenario $scenarioId event $eventId has malformed when."
         }
+        Check-Event-After-Event $when $scenarioId $eventId $eventIds
         Check-Required-Flags (Get-Prop $when "campaign_flags" $null) $scenarioId "event $eventId"
         $trigger = [string]$event.when.type
         if (-not $validTriggers.Contains($trigger)) {