extends Node3D
## World controller.
##
## Owns spawn ordering so the player never falls through ungenerated ground:
## waits for the terrain, places the scenery, then drops the player onto a dry,
## flat spot facing the lake. Also aims the sun, and respawns the player if they
## somehow leave the map or fall below it (a safety net behind the mountain rim
## and invisible wall in terrain.gd).
##
## Dev hook: `godot --path . -- --shot=/abs/prefix` renders a few fixed views to
## <prefix>_<view>.png and quits. Handy for checking visual changes.

@export var sun_elevation_deg: float = 34.0
@export var sun_azimuth_deg: float = 40.0   ## 0 = behind the spawn view, + = to its right

@onready var terrain: Node3D = $Terrain
@onready var props: Node3D = $Props
@onready var player: CharacterBody3D = $Player
@onready var sun: DirectionalLight3D = $Sun

var _spawn := Vector3.ZERO
var _spawn_yaw := 0.0

func _ready() -> void:
	_aim_sun()
	player.set_physics_process(false)
	set_physics_process(false)
	if terrain.built:
		_on_terrain_ready()
	else:
		terrain.ready_built.connect(_on_terrain_ready)

func _aim_sun() -> void:
	var el := deg_to_rad(sun_elevation_deg)
	var az := deg_to_rad(sun_azimuth_deg)
	var to_sun := Vector3(sin(az) * cos(el), sin(el), cos(az) * cos(el))
	sun.global_basis = Basis.looking_at(-to_sun, Vector3.UP)

func _on_terrain_ready() -> void:
	var t0 := Time.get_ticks_msec()
	_spawn = terrain.find_spawn(Vector2.ZERO)
	var lake: Vector2 = terrain.lake_center
	var to_lake := lake - Vector2(_spawn.x, _spawn.z)
	_spawn_yaw = atan2(-to_lake.x, -to_lake.y)
	player.water_level = terrain.water_level
	props.place_on(terrain, player, _spawn)
	print("[world] scenery placed in %d ms" % (Time.get_ticks_msec() - t0))
	_respawn()
	player.set_physics_process(true)
	set_physics_process(true)
	_maybe_capture()

func _respawn() -> void:
	player.global_position = _spawn + Vector3(0.0, 1.5, 0.0)
	player.velocity = Vector3.ZERO
	player.rotation = Vector3(0.0, _spawn_yaw, 0.0)
	player.get_node("Camera3D").rotation.x = 0.0

func _physics_process(_delta: float) -> void:
	var p := player.global_position
	var half: float = terrain.size * 0.5
	if p.y < terrain.min_height - 30.0 or absf(p.x) > half or absf(p.z) > half \
			or not terrain.inside_boundary(p.x, p.z, -4.0):
		push_warning("[world] player left the map at %s; respawning" % p)
		_respawn()

# --- dev screenshot hook ----------------------------------------------------

func _maybe_capture() -> void:
	var prefix := ""
	for a in OS.get_cmdline_user_args():
		if a.begins_with("--shot="):
			prefix = a.trim_prefix("--shot=")
	if prefix.is_empty():
		return
	var lake: Vector2 = terrain.lake_center
	# [name, eye position (y = height above ground), look-at point] ; null = spawn view
	var views := [
		["spawn", null, null],
		["aerial", Vector3(0, 110, 150), Vector3(0, 0, -20)],
		["lake", Vector3(lake.x - 30.0, 3.0, lake.y + 22.0), Vector3(lake.x, -2.0, lake.y)],
		["forest", Vector3(-40, 1.7, 30), Vector3(-70, 4.0, 10)],
		["rim", Vector3(0, 2.0, 70), Vector3(0, 25.0, 125)],
	]
	# Sea-cliff views: from the cliff top out to sea, and from the water back at the cliff.
	var sa: float = terrain.sea_angle_deg
	var top: Vector2 = terrain.coast_point(sa + 12.0, -6.0)
	var out: Vector2 = terrain.coast_point(sa + 12.0, 200.0)
	views.append(["seacliff_top", Vector3(top.x, 1.7, top.y), Vector3(out.x, terrain.sea_level - 6.0, out.y)])
	var boat: Vector2 = terrain.coast_point(sa - 6.0, 38.0)
	var face: Vector2 = terrain.coast_point(sa + 4.0, 0.0)
	var boat_eye := Vector3(boat.x, terrain.sea_level + 3.0 - terrain.sample_height(boat.x, boat.y), boat.y)
	views.append(["seacliff_from_sea", boat_eye, Vector3(face.x, terrain.sea_level + 8.0, face.y)])
	# Along the cliff edge into the western headland (where the old pit was).
	var walk: Vector2 = terrain.coast_point(sa - 20.0, -8.0)
	var head: Vector2 = terrain.coast_point(sa - 52.0, 0.0)
	views.append(["headland", Vector3(walk.x, 1.7, walk.y), Vector3(head.x, 2.0, head.y)])
	await get_tree().create_timer(4.0).timeout
	set_physics_process(false)   # views may sit outside the walkable area
	var cam: Camera3D = player.get_node("Camera3D")
	for v in views:
		if v[1] != null:
			player.set_physics_process(false)
			var eye: Vector3 = v[1]
			eye.y += terrain.sample_height(eye.x, eye.z)
			var dir: Vector3 = (v[2] as Vector3) - eye
			player.global_position = eye - Vector3(0.0, cam.position.y, 0.0)
			player.rotation = Vector3(0.0, atan2(-dir.x, -dir.z), 0.0)
			cam.rotation.x = atan2(dir.y, Vector2(dir.x, dir.z).length())
			props._update_grass(100000)
			await get_tree().create_timer(1.0).timeout
		await RenderingServer.frame_post_draw
		var path := "%s_%s.png" % [prefix, v[0]]
		get_viewport().get_texture().get_image().save_png(path)
		print("[world] saved ", path)
	get_tree().quit()