extends SceneTree

const EffectPlayer = preload("res://fx/effect_player.gd")
var failures := 0

func check(ok: bool, label: String) -> void:
	if not ok:
		failures += 1
		printerr("FAIL: " + label)

func _init() -> void:
	var fx := EffectPlayer.new()
	# D3D8: SRCALPHA=5, INVSRCALPHA=6; both mesh and particle use this helper.
	check(fx._blend(5, 6) == BaseMaterial3D.BLEND_MODE_MIX, "source-alpha transparency")
	check(fx._blend(5, 2) == BaseMaterial3D.BLEND_MODE_ADD, "additive glow preserved")
	fx.build({"particles": [{"start_time": 0.5,
		"emitter": {"CycleLength": 1.0, "CycleLoopEnable": 1, "LoopCount": 2},
		"particle": {"SrcBlendType": 5, "DestBlendType": 6}}]})
	var state: Dictionary = fx._particle_states[0]
	var emitter: GPUParticles3D = state.node
	check(emitter.material_override.blend_mode == BaseMaterial3D.BLEND_MODE_MIX,
		"built particle uses alpha material")
	fx._advance_particle(state, 0.25)
	check(is_equal_approx(state.clock, 0.25) and not emitter.emitting,
		"stationary emitter advances clock and respects start delay")
	# Simulate the play timer starting emission; isolate cycle gating from timers.
	emitter.emitting = true
	fx._advance_particle(state, 2.0)
	check(emitter.emitting and not state.emission_stopped, "finite loop before end")
	fx._advance_particle(state, 0.25)
	check(not emitter.emitting and state.emission_stopped, "stationary finite loop ends")
	state.clock = 0.0
	state.start_time = 0.0
	state.cycle_loop = false
	state.emission_stopped = false
	emitter.emitting = true
	fx._advance_particle(state, 1.0)
	check(not emitter.emitting and state.emission_stopped, "stationary non-loop ends")
	state.clock = 0.0
	state.cycle_loop = true
	state.loop_count = 0
	state.emission_stopped = false
	emitter.emitting = true
	fx._advance_particle(state, 10.0)
	check(emitter.emitting and not state.emission_stopped, "unlimited loop preserved")
	check(emitter.position == Vector3.ZERO, "missing position stays at origin")
	fx.free()
	var path := AssetRoot.path().path_join("PC/ymir work/pc/shaman/effect/7budongbakbu_throw.mse")
	var parsed: Dictionary = preload("res://fx/mse.gd").new().parse_file(path)
	check(not parsed.get("particles", []).is_empty(), "real shaman effect loaded")
	var real_fx := EffectPlayer.new()
	real_fx.build(parsed, AssetRoot.path())
	var alpha_count := 0
	for i in parsed.get("particles", []).size():
		var prop: Dictionary = parsed.particles[i].particle
		if int(prop.get("SrcBlendType", 0)) == 5 and int(prop.get("DestBlendType", 0)) == 6:
			alpha_count += 1
			check(real_fx._emitters[i].material_override.blend_mode == BaseMaterial3D.BLEND_MODE_MIX,
				"real shaman alpha particle %d" % i)
	check(alpha_count > 0, "real fixture exercises alpha blending")
	real_fx.free()
	print("effect_render_regression_test: failures=%d" % failures)
	quit(1 if failures else 0)