class_name ScenarioValidator
extends RefCounted
## Validates authored venue data before a shift. Keeps content-matrix failures
## out of runtime: every event must reference a known profile and a valid phase,
## event ids must be unique, and the matrix must cover enough kinds/phases.

const Rules := preload("res://src/core/rules.gd")

static func validate(scenario: Resource) -> Array[String]:
	var problems: Array[String] = []
	if scenario == null:
		return ["scenario is null"]
	var profile_types := {}
	for profile in scenario.npc_profiles:
		if profile != null:
			profile_types[int(profile.npc_type)] = true
	var ids := {}
	var routine := 0
	var scripted := 0
	var recovery := 0
	var phases := {}
	for event in scenario.event_pool:
		if not (event is Dictionary):
			problems.append("event is not a dictionary")
			continue
		var event_id := str(event.get("id", ""))
		if event_id == "":
			problems.append("event has no id")
		elif ids.has(event_id):
			problems.append("duplicate event id: %s" % event_id)
		ids[event_id] = true
		var phase := int(event.get("phase", -1))
		if phase < Rules.Phase.EARLY or phase > Rules.Phase.LATE:
			problems.append("%s has invalid phase %d" % [event_id, phase])
		var npc_type := int(event.get("npc_type", -1))
		if not profile_types.has(npc_type):
			problems.append("%s references missing profile type %d" % [event_id, npc_type])
		if str(event.get("intent", "")) == "":
			problems.append("%s has no intent" % event_id)
		var kind := str(event.get("kind", "routine"))
		if kind == "routine":
			routine += 1
		elif kind == "scripted":
			scripted += 1
		elif kind == "recovery":
			recovery += 1
		elif kind != "routine":
			problems.append("%s has unknown kind %s" % [event_id, kind])
		phases[phase] = true
	if scenario.event_pool.size() < 12:
		problems.append("event matrix has %d events; need at least 12" % scenario.event_pool.size())
	if routine < 6:
		problems.append("event matrix needs at least 6 routine events")
	if scripted < 2:
		problems.append("event matrix needs at least 2 scripted events")
	if recovery < 1:
		problems.append("event matrix needs at least 1 recovery event")
	if phases.size() < 2:
		problems.append("event matrix must cover at least 2 shift phases")
	return problems