## D-030 Layer 1: Tests for rendering components (tile, fog, entity renderers)
## Validates renderers handle snapshot data correctly.
class_name TestRendering
extends GdUnitTestSuite

var EntityRendererScript = load("res://scripts/rendering/entity_renderer.gd")
var FogRendererScript = load("res://scripts/rendering/fog_renderer.gd")
var TileRendererScript = load("res://scripts/rendering/tile_renderer.gd")

# -- Test data matching Protocol decoded format --

var _test_tiles: Array = [
	{"x": 0, "y": 0, "z": 0, "type": "floor"},
	{"x": 1, "y": 0, "z": 0, "type": "wall"},
	{"x": 2, "y": 0, "z": 0, "type": "door"},
	{"x": 3, "y": 0, "z": 0, "type": "object"},
	{"x": 0, "y": 1, "z": 0, "type": "floor"},
]

var _test_entities: Array = [
	{"entity_id": 1, "x": 5.0, "y": 5.0, "z": 0, "kind": {"variant": "Player", "data": null}},
	{"entity_id": 2, "x": 7.0, "y": 5.0, "z": 0, "kind": {"variant": "Npc", "data": null}},
]


# -- Constants --

func test_tile_size_constant() -> void:
	assert_that(Constants.TILE_SIZE).is_equal(32)


# -- GameState: tile and visibility data --

func test_game_state_stores_tiles() -> void:
	GameState.apply_snapshot({"tick": 1, "tiles": _test_tiles})
	assert_that(GameState.visible_tiles.size()).is_equal(5)

func test_game_state_stores_visible_positions() -> void:
	var positions := [{"x": 5, "y": 5}, {"x": 6, "y": 5}]
	GameState.apply_snapshot({"tick": 1, "visible_positions": positions})
	assert_that(GameState.visible_positions.size()).is_equal(2)
	assert_that(GameState.visible_positions.has(Vector2i(5, 5))).is_true()
	assert_that(GameState.visible_positions.has(Vector2i(6, 5))).is_true()

func test_game_state_clears_old_visible_positions() -> void:
	GameState.apply_snapshot({"tick": 1, "visible_positions": [{"x": 1, "y": 1}]})
	assert_that(GameState.visible_positions.size()).is_equal(1)
	GameState.apply_snapshot({"tick": 2, "visible_positions": [{"x": 2, "y": 2}, {"x": 3, "y": 3}]})
	assert_that(GameState.visible_positions.size()).is_equal(2)
	assert_that(GameState.visible_positions.has(Vector2i(1, 1))).is_false()

func test_game_state_warns_on_missing_player() -> void:
	GameState.player_entity_id = 999
	GameState.player_position = Vector2(5, 5)
	GameState.apply_snapshot({"tick": 1, "entities": _test_entities})
	assert_that(GameState.player_position).is_equal(Vector2(5, 5))


# -- SimBridge: test data completeness --

func test_sim_bridge_test_snapshot_has_tiles() -> void:
	SimBridge._test_tick = 0
	var snap = SimBridge._test_snapshot()
	assert_that(snap.has("tiles")).is_true()
	assert_that(snap.tiles.size()).is_greater(0)
	var tile = snap.tiles[0]
	assert_that(tile.has("x")).is_true()
	assert_that(tile.has("y")).is_true()
	assert_that(tile.has("type")).is_true()

func test_sim_bridge_test_snapshot_has_visible_positions() -> void:
	SimBridge._test_tick = 0
	var snap = SimBridge._test_snapshot()
	assert_that(snap.has("visible_positions")).is_true()
	assert_that(snap.visible_positions.size()).is_greater(0)
	var pos = snap.visible_positions[0]
	assert_that(pos.has("x")).is_true()
	assert_that(pos.has("y")).is_true()

func test_sim_bridge_test_snapshot_has_player_entity() -> void:
	SimBridge._test_tick = 0
	var snap = SimBridge._test_snapshot()
	var has_player := false
	for entity in snap.entities:
		if entity.kind.variant == "Player":
			has_player = true
			break
	assert_that(has_player).is_true()

func test_sim_bridge_test_snapshot_has_npc() -> void:
	SimBridge._test_tick = 0
	var snap = SimBridge._test_snapshot()
	var has_npc := false
	for entity in snap.entities:
		if entity.kind.variant == "Npc":
			has_npc = true
			break
	assert_that(has_npc).is_true()

func test_sim_bridge_test_tiles_contain_all_types() -> void:
	SimBridge._test_tick = 0
	var snap = SimBridge._test_snapshot()
	var types: Dictionary = {}
	for tile in snap.tiles:
		types[tile.type] = true
	assert_that(types.has("floor")).is_true()
	assert_that(types.has("wall")).is_true()
	assert_that(types.has("door")).is_true()


# -- EntityRenderer: lifecycle --

func _make_entity_renderer() -> Node2D:
	var renderer = Node2D.new()
	renderer.set_script(EntityRendererScript)
	add_child(renderer)
	return renderer

func test_entity_renderer_creates_nodes() -> void:
	var renderer := _make_entity_renderer()
	renderer.update_entities(_test_entities)

	assert_that(renderer.entity_nodes.size()).is_equal(2)
	assert_that(renderer.entity_nodes.has(1)).is_true()
	assert_that(renderer.entity_nodes.has(2)).is_true()
	renderer.queue_free()

func test_entity_renderer_removes_stale_entities() -> void:
	var renderer := _make_entity_renderer()
	renderer.update_entities(_test_entities)
	assert_that(renderer.entity_nodes.size()).is_equal(2)

	renderer.update_entities([_test_entities[0]])
	assert_that(renderer.entity_nodes.size()).is_equal(1)
	assert_that(renderer.entity_nodes.has(1)).is_true()
	renderer.queue_free()

func test_entity_renderer_positions_centered() -> void:
	var renderer := _make_entity_renderer()
	renderer.update_entities([_test_entities[0]])

	var node = renderer.entity_nodes[1]
	var offset: float = (Constants.TILE_SIZE - 24) / 2.0
	var expected_x: float = 5.0 * Constants.TILE_SIZE + offset
	var expected_y: float = 5.0 * Constants.TILE_SIZE + offset
	assert_that(node.position.x).is_equal_approx(expected_x, 0.01)
	assert_that(node.position.y).is_equal_approx(expected_y, 0.01)
	renderer.queue_free()

func test_entity_renderer_skips_missing_entity_id() -> void:
	var renderer := _make_entity_renderer()
	renderer.update_entities([{"x": 1.0, "y": 1.0, "z": 0, "kind": {"variant": "Npc", "data": null}}])
	assert_that(renderer.entity_nodes.size()).is_equal(0)
	renderer.queue_free()

func test_entity_renderer_player_color_differs_from_npc() -> void:
	var renderer := _make_entity_renderer()
	renderer.update_entities(_test_entities)

	var player_node = renderer.entity_nodes[1] as ColorRect
	var npc_node = renderer.entity_nodes[2] as ColorRect
	assert_that(player_node.color != npc_node.color).is_true()
	renderer.queue_free()

func test_entity_renderer_empty_entities_clears_all() -> void:
	var renderer := _make_entity_renderer()
	renderer.update_entities(_test_entities)
	assert_that(renderer.entity_nodes.size()).is_equal(2)

	renderer.update_entities([])
	assert_that(renderer.entity_nodes.size()).is_equal(0)
	renderer.queue_free()


# -- FogRenderer: position registration --

func _make_fog_renderer() -> TileMapLayer:
	var fog = TileMapLayer.new()
	fog.set_script(FogRendererScript)
	return fog

func test_fog_renderer_registers_positions() -> void:
	var fog := _make_fog_renderer()
	fog.register_tile_positions(_test_tiles)
	assert_that(fog._all_tile_positions.size()).is_equal(5)
	assert_that(fog._all_tile_positions.has(Vector2i(0, 0))).is_true()
	assert_that(fog._all_tile_positions.has(Vector2i(3, 0))).is_true()
	assert_that(fog._all_tile_positions.has(Vector2i(0, 1))).is_true()
	fog.free()

func test_fog_renderer_clears_on_re_register() -> void:
	var fog := _make_fog_renderer()
	fog.register_tile_positions(_test_tiles)
	assert_that(fog._all_tile_positions.size()).is_equal(5)

	fog.register_tile_positions([{"x": 10, "y": 10, "z": 0, "type": "floor"}])
	assert_that(fog._all_tile_positions.size()).is_equal(1)
	assert_that(fog._all_tile_positions.has(Vector2i(0, 0))).is_false()
	fog.free()

func test_fog_renderer_handles_empty_data() -> void:
	var fog := _make_fog_renderer()
	fog._initialized = true
	fog.update_fog({}, Vector2.ZERO)
	fog.register_tile_positions([])
	assert_that(fog._all_tile_positions.size()).is_equal(0)
	fog.free()


# -- TileRenderer: tile type constants --

func test_tile_type_map_covers_required_types() -> void:
	var tile_script = TileRendererScript
	var required := ["floor", "wall", "door", "object"]
	for tile_type in required:
		assert_that(tile_script.TILE_TYPE_MAP.has(tile_type)).is_true()