## Test suite for #126: Medium-range visual indicators (D-018)
## Spec refs:
##   D-018: Medium-range (outside LOS, nearby) → fog-edge directional indicators
##   D-049: Z-stack — indicators must render above fog layer (z:900)
##   D-069: Color palette for indicators (neutral/voice/danger)
##
## Color spec (sprint brief + D-018/D-069):
##   Neutral:  #c8d0e0 (matches INSERT_COLOR_TEXT — insert visual language)
##   Voices:   #e8c547 (matches ENTITY_COLOR_POI — amber, voice context)
##   Danger:   #d45d5d (matches ENTITY_COLOR_HOSTILE — muted red)
##
## Test layers:
##   1. D-018 Indicator color spec — verifies Constants match the spec
##   2. D-018 Range routing — Medium vs Close events belong to different systems
##   3. Direction geometry — angle from player position to sound source
##   4. Snapshot integration stubs — graceful skip until #126 lands
##   5. Indicator script API — graceful skip until Stig creates the script
class_name TestSoundIndicators
extends GdUnitTestSuite


# ==============================================================================
# Layer 1: D-018/D-069 Indicator Color Spec
# Sound indicators reuse existing Constants to avoid palette drift.
# ==============================================================================

func test_d018_indicator_color_neutral_is_insert_color() -> void:
	## D-018: Neutral indicator = #c8d0e0 = INSERT_COLOR_TEXT.
	## Indicators use the insert visual language (diegetic, not world-layer UI).
	assert_that(Constants.INSERT_COLOR_TEXT).is_equal(Color("#c8d0e0"))

func test_d018_indicator_color_voices_is_poi_amber() -> void:
	## D-018/D-069: Voice indicator = #e8c547 = ENTITY_COLOR_POI (amber).
	assert_that(Constants.ENTITY_COLOR_POI).is_equal(Color("#e8c547"))

func test_d018_indicator_color_danger_is_hostile_red() -> void:
	## D-018/D-069: Danger indicator = #d45d5d = ENTITY_COLOR_HOSTILE (muted red).
	assert_that(Constants.ENTITY_COLOR_HOSTILE).is_equal(Color("#d45d5d"))

func test_d018_three_indicator_colors_are_distinct() -> void:
	## D-018: All three indicator states must be visually distinct.
	var neutral: Color = Constants.INSERT_COLOR_TEXT
	var voice: Color = Constants.ENTITY_COLOR_POI
	var danger: Color = Constants.ENTITY_COLOR_HOSTILE
	assert_that(neutral != voice).is_true()
	assert_that(neutral != danger).is_true()
	assert_that(voice != danger).is_true()

func test_d049_fog_layer_z_index() -> void:
	## D-049: Fog overlay is at z:900. Indicators must render above it (z > 900).
	## This verifies the z constant — indicator placement depends on it.
	assert_that(Constants.Z_FOG).is_equal(900)


# ==============================================================================
# Layer 2: D-018 Range Routing — Medium vs Close
# Close-range events → AudioManager.play_at() (spatial audio, no indicator)
# Medium-range events → fog-edge indicators (no direct audio)
# ==============================================================================

func test_d018_medium_range_events_stored_in_snapshot() -> void:
	## GameState.medium_sound_events receives Medium-range events (#126 implemented).
	GameState.apply_snapshot({
		"tick": 1,
		"sound_events": [
			{"x": 20.0, "y": 20.0, "event_type": "Footstep", "range_category": "Medium"},
		]
	})
	assert_that(GameState.medium_sound_events.size()).is_equal(1)
	assert_that(GameState.medium_sound_events[0].event_type).is_equal("Footstep")

func test_d018_close_range_events_do_not_appear_in_medium() -> void:
	## D-018: Close events must NOT appear in medium_sound_events.
	## They go to close_sound_events for 2D positional audio.
	GameState.apply_snapshot({
		"tick": 1,
		"sound_events": [
			{"x": 3.0, "y": 3.0, "event_type": "Voice", "range_category": "Close"},
			{"x": 15.0, "y": 15.0, "event_type": "Footstep", "range_category": "Medium"},
		]
	})
	assert_that(GameState.medium_sound_events.size()).is_equal(1)
	assert_that(GameState.close_sound_events.size()).is_equal(1)

func test_d018_medium_range_event_has_position_fields() -> void:
	## Medium-range events must include source position for direction calculation.
	GameState.apply_snapshot({
		"tick": 1,
		"sound_events": [
			{"x": 12.0, "y": 8.0, "event_type": "Footstep", "range_category": "Medium"},
		]
	})
	var ev: Dictionary = GameState.medium_sound_events[0]
	assert_that(ev.has("x")).is_true()
	assert_that(ev.has("y")).is_true()
	assert_that(float(ev["x"])).is_equal_approx(12.0, 0.001)
	assert_that(float(ev["y"])).is_equal_approx(8.0, 0.001)


# ==============================================================================
# Layer 3: Direction Geometry
# The fog-edge indicator must point toward the sound source from the player.
# These tests validate the math used by the indicator rendering — if the
# indicator uses Vector2.angle() or atan2, these confirm expected output.
# ==============================================================================

## Compute directional angle (radians) from player tile pos to source tile pos.
## 0 = East, -PI/2 = North, PI/2 = South, ±PI = West (Godot Y-down convention).
func _direction_angle(player: Vector2, source: Vector2) -> float:
	return player.direction_to(source).angle()

func test_indicator_direction_north() -> void:
	## Source directly north of player (lower y in Godot) → angle -PI/2.
	var angle := _direction_angle(Vector2(10.0, 10.0), Vector2(10.0, 0.0))
	assert_that(angle).is_equal_approx(-PI / 2.0, 0.01)

func test_indicator_direction_east() -> void:
	## Source directly east → angle 0.
	var angle := _direction_angle(Vector2(10.0, 10.0), Vector2(20.0, 10.0))
	assert_that(angle).is_equal_approx(0.0, 0.01)

func test_indicator_direction_south() -> void:
	## Source directly south (higher y) → angle PI/2.
	var angle := _direction_angle(Vector2(10.0, 10.0), Vector2(10.0, 20.0))
	assert_that(angle).is_equal_approx(PI / 2.0, 0.01)

func test_indicator_direction_west() -> void:
	## Source directly west → angle ≈ ±PI.
	var angle := _direction_angle(Vector2(10.0, 10.0), Vector2(0.0, 10.0))
	assert_that(absf(angle)).is_equal_approx(PI, 0.01)

func test_indicator_direction_northeast() -> void:
	## Source equal offset northeast → angle -PI/4.
	var angle := _direction_angle(Vector2(10.0, 10.0), Vector2(20.0, 0.0))
	assert_that(angle).is_equal_approx(-PI / 4.0, 0.01)

func test_indicator_direction_southeast() -> void:
	## Source equal offset southeast → angle PI/4.
	var angle := _direction_angle(Vector2(10.0, 10.0), Vector2(20.0, 20.0))
	assert_that(angle).is_equal_approx(PI / 4.0, 0.01)

func test_indicator_direction_southwest() -> void:
	## Source equal offset southwest → angle 3PI/4.
	var angle := _direction_angle(Vector2(10.0, 10.0), Vector2(0.0, 20.0))
	assert_that(angle).is_equal_approx(3.0 * PI / 4.0, 0.01)

func test_indicator_direction_changes_with_source_position() -> void:
	## Sanity: direction is not degenerate — different source positions give different angles.
	var north := _direction_angle(Vector2(10.0, 10.0), Vector2(10.0, 0.0))
	var east := _direction_angle(Vector2(10.0, 10.0), Vector2(20.0, 10.0))
	var south := _direction_angle(Vector2(10.0, 10.0), Vector2(10.0, 20.0))
	assert_that(north != east).is_true()
	assert_that(east != south).is_true()
	assert_that(south != north).is_true()

func test_indicator_direction_magnitude_independent_of_distance() -> void:
	## Direction angle must not vary with distance — only with angle from player.
	## Source 5 tiles north vs 20 tiles north: same angle.
	var near := _direction_angle(Vector2(10.0, 10.0), Vector2(10.0, 5.0))
	var far := _direction_angle(Vector2(10.0, 10.0), Vector2(10.0, -10.0))
	assert_that(near).is_equal_approx(far, 0.01)


# ==============================================================================
# Layer 4: Indicator Script API (graceful stub)
# Tests activate when Stig creates the indicator rendering script.
# Expected paths checked in order — first match wins.
# ==============================================================================

func _load_indicator_script() -> GDScript:
	## Load the sound indicator renderer script (#126 implemented).
	var path: String = "res://scripts/rendering/sound_indicator_renderer.gd"
	if ResourceLoader.exists(path):
		return load(path) as GDScript
	return null

func test_indicator_script_exists() -> void:
	## #126: sound_indicator_renderer.gd must exist at the canonical path.
	var script: GDScript = _load_indicator_script()
	assert_that(script != null).is_true()

func test_indicator_has_update_sound_events_method() -> void:
	## #126: Indicator must expose update_sound_events(events: Array).
	var script: GDScript = _load_indicator_script()
	if script == null:
		push_warning("TestSoundIndicators: sound_indicator_renderer.gd not found")
		return
	var method_names: Array = script.get_script_method_list().map(
		func(m: Dictionary) -> String: return m.name
	)
	assert_that(method_names.has("update_sound_events")).is_true()

func test_indicator_does_not_crash_for_empty_events() -> void:
	## Edge case: empty sound_events list must not crash update_sound_events.
	var script: GDScript = _load_indicator_script()
	if script == null:
		push_warning("TestSoundIndicators: sound_indicator_renderer.gd not found")
		return
	var indicator := Node2D.new()
	indicator.set_script(script)
	add_child(indicator)
	indicator.update_sound_events([])
	# Empty update on fresh renderer — no indicators exist, no crash
	assert_that(indicator._indicators.size()).is_equal(0)
	indicator.queue_free()

func test_indicator_existing_survive_empty_update() -> void:
	## Existing indicators persist through an empty update (expire via _process only).
	var script: GDScript = _load_indicator_script()
	if script == null:
		push_warning("TestSoundIndicators: sound_indicator_renderer.gd not found")
		return
	var indicator := Node2D.new()
	indicator.set_script(script)
	add_child(indicator)
	indicator.update_sound_events([{"x": 5.0, "y": 5.0, "event_type": "Voice"}])
	assert_that(indicator._indicators.size()).is_equal(1)
	indicator.update_sound_events([])
	assert_that(indicator._indicators.size()).is_equal(1)
	indicator.queue_free()

func test_indicator_stores_valid_medium_events() -> void:
	## #126: update_sound_events must store events with x and y fields.
	var script: GDScript = _load_indicator_script()
	if script == null:
		push_warning("TestSoundIndicators: sound_indicator_renderer.gd not found")
		return
	var indicator := Node2D.new()
	indicator.set_script(script)
	add_child(indicator)
	indicator.update_sound_events([
		{"x": 10.0, "y": 5.0, "event_type": "Footstep"},
		{"x": 20.0, "y": 15.0, "event_type": "Voice"},
	])
	assert_that(indicator._indicators.size()).is_equal(2)
	indicator.queue_free()