extends GdUnitTestSuite

## NEO-24 integration test (code-review follow-up to the blocking issue):
##
## `main.gd` connects `PositionAuthorityClient.authoritative_ack` →
## `TargetSelectionClient.on_authoritative_ack`. The unit suites cover each side
## in isolation, but do not prove the two actually meet during normal locomotion
## (a successful `move-stream` POST, not a boot resync). This suite wires the
## **real** scripts together with mock HTTP transports and exercises that path
## end-to-end: with a lock held, a `move-stream` 200 must produce a throttled
## `GET /target` refresh on the target client's transport.

const PositionAuthorityTestDouble := preload("res://test/position_authority_test_double.gd")
const TargetSelectionTestDouble := preload("res://test/target_selection_test_double.gd")

const ALPHA_ID := "prototype_npc_melee"


# Mirrors the transports from the per-client suites: a queue-backed `Node` with a
# `request()` that synchronously emits `request_completed`. Counts requests so the
# test can assert exactly how many GETs reached the target-client transport.
class MockHttpTransport:
	extends Node
	signal request_completed(
		result: int, response_code: int, headers: PackedStringArray, body: PackedByteArray
	)
	var request_count: int = 0
	var last_url: String = ""
	var last_method: HTTPClient.Method = HTTPClient.METHOD_GET
	var _queue: Array[Dictionary] = []

	func enqueue(result: int, code: int, body: String) -> void:
		_queue.append({"result": result, "code": code, "body": body})

	func request(
		url: String,
		_custom_headers: PackedStringArray = PackedStringArray(),
		method: HTTPClient.Method = HTTPClient.METHOD_GET,
		_request_data: String = ""
	) -> Error:
		request_count += 1
		last_url = url
		last_method = method
		if _queue.is_empty():
			return ERR_UNAVAILABLE
		var r: Dictionary = _queue.pop_front()
		var body_bytes: PackedByteArray = str(r["body"]).to_utf8_buffer()
		request_completed.emit(r["result"], r["code"], PackedStringArray(), body_bytes)
		return OK


func _make_authority(transport: Node) -> Node:
	var a: Node = PositionAuthorityTestDouble.new()
	a.set("injected_http", transport)
	auto_free(transport)
	auto_free(a)
	add_child(a)
	return a


func _make_target_client(transport: Node) -> Node:
	var c: Node = TargetSelectionTestDouble.new()
	c.set("injected_http", transport)
	auto_free(transport)
	auto_free(c)
	add_child(c)
	return c


func _select_response_json(locked_id: String, validity: String, sequence: int) -> String:
	var state := (
		'{"schemaVersion":1,"playerId":"dev-local-1","lockedTargetId":"%s",' % locked_id
		+ '"validity":"%s","sequence":%d}' % [validity, sequence]
	)
	return '{"schemaVersion":1,"selectionApplied":true,"targetState":%s}' % state


func _target_state_json(locked_id: String, validity: String, sequence: int) -> String:
	return (
		'{"schemaVersion":1,"playerId":"dev-local-1","lockedTargetId":"%s",' % locked_id
		+ '"validity":"%s","sequence":%d}' % [validity, sequence]
	)


func test_move_stream_200_triggers_target_refresh_while_locked() -> void:
	# Arrange
	var auth_transport := MockHttpTransport.new()
	var target_transport := MockHttpTransport.new()

	# 1) Target client locks alpha via POST.
	target_transport.enqueue(
		HTTPRequest.RESULT_SUCCESS, 200, _select_response_json(ALPHA_ID, "ok", 1)
	)
	# 2) After the move-stream POST, the target client refreshes with GET.
	target_transport.enqueue(
		HTTPRequest.RESULT_SUCCESS, 200, _target_state_json(ALPHA_ID, "out_of_range", 1)
	)
	# 3) The authority's move-stream POST echoes position (triggers `authoritative_ack`).
	auth_transport.enqueue(
		HTTPRequest.RESULT_SUCCESS,
		200,
		(
			'{"schemaVersion":1,"playerId":"dev-local-1","position":{"x":-20,"y":0.9,"z":-20},'
			+ '"sequence":3}'
		)
	)

	var authority := _make_authority(auth_transport)
	var target_client := _make_target_client(target_transport)

	# Same wiring as `main.gd` so this test fails loudly if someone renames the signal
	# or handler without updating both ends.
	authority.connect("authoritative_ack", Callable(target_client, "on_authoritative_ack"))

	# Act
	target_client.request_select_target_id(ALPHA_ID)
	# Assert
	assert_that(target_client.cached_state().get("lockedTargetId")).is_equal(ALPHA_ID)
	var get_count_baseline: int = target_transport.request_count

	# Act
	authority.submit_stream_targets([Vector3(-20.0, 0.9, -20.0)])

	# Assert
	var new_requests: int = target_transport.request_count - get_count_baseline
	assert_that(new_requests).is_equal(1)
	assert_that(target_transport.last_url).contains("/game/players/dev-local-1/target")
	assert_that(target_transport.last_method).is_equal(HTTPClient.METHOD_GET)
	assert_that(target_client.cached_state().get("validity")).is_equal("out_of_range")
	# Soft lock is preserved on out-of-range.
	assert_that(target_client.cached_state().get("lockedTargetId")).is_equal(ALPHA_ID)


func test_move_stream_200_does_not_refresh_without_lock() -> void:
	# Arrange
	var auth_transport := MockHttpTransport.new()
	var target_transport := MockHttpTransport.new()

	auth_transport.enqueue(
		HTTPRequest.RESULT_SUCCESS,
		200,
		'{"schemaVersion":1,"playerId":"dev-local-1","position":{"x":0,"y":0.9,"z":0},"sequence":1}'
	)

	var authority := _make_authority(auth_transport)
	var target_client := _make_target_client(target_transport)
	authority.connect("authoritative_ack", Callable(target_client, "on_authoritative_ack"))

	# Act
	authority.submit_stream_targets([Vector3.ZERO])

	# Assert
	assert_that(target_transport.request_count).is_equal(0)