extends CharacterBody3D

const GEOSET_CONTROLLER_SCRIPT := preload("res://src/scenes/character/character_geoset_controller.gd")
const TEXTURE_COMPOSITOR_SCRIPT := preload("res://src/scenes/character/character_texture_compositor.gd")
const OUTFIT_RESOLVER_SCRIPT := preload("res://src/scenes/character/wow_character_outfit_resolver.gd")
const COORDINATE_MAPPER_SCRIPT := preload("res://src/domain/coordinates/coordinate_mapper.gd")
const GODOT_WORLD_POSITION_SCRIPT := preload("res://src/domain/coordinates/godot_world_position.gd")
const ADT_TILE_COORDINATE_SCRIPT := preload("res://src/domain/coordinates/adt_tile_coordinate.gd")
const ADT_TILE_LOCAL_POSITION_SCRIPT := preload("res://src/domain/coordinates/adt_tile_local_position.gd")
const PLAYER_INPUT_SOURCE_SCRIPT := preload("res://src/gameplay/input/player_input_source.gd")
const PLAYER_INPUT_ACTIONS_SCRIPT := preload("res://src/gameplay/input/player_input_actions.gd")

const CHUNK_SIZE := COORDINATE_MAPPER_SCRIPT.ADT_CHUNK_SIZE_YARDS
const UNIT_SIZE := CHUNK_SIZE / 8.0

@export var extracted_dir: String = "res://data/extracted"
@export var map_name: String = "Azeroth"
@export var spawn_tile_x: int = 42
@export var spawn_tile_y: int = 28
@export var spawn_at_tile_center: bool = true

@export var run_speed: float = 7.0
@export var backward_speed: float = 4.5
@export var strafe_speed: float = 4.5
@export var sprint_multiplier: float = 6.0
@export var flight_vertical_speed: float = 7.0
@export var acceleration: float = 28.0
@export var mouse_sensitivity: float = 0.003
@export var camera_pitch_min: float = deg_to_rad(-65.0)
@export var camera_pitch_max: float = deg_to_rad(35.0)
@export var camera_height: float = 1.7
@export var camera_distance: float = 8.0
@export var camera_min_distance: float = 2.0
@export var camera_max_distance: float = 18.0
@export var camera_zoom_step: float = 1.0
@export var ground_offset: float = 0.05
@export var ground_snap_speed: float = 24.0

@export var camera_pivot_path: NodePath = NodePath("CameraPivot")
@export var camera_path: NodePath = NodePath("CameraPivot/Camera3D")
@export var visual_path: NodePath = NodePath("Visual")
@export var character_model_path: String = "res://src/resources/characters/HUMAN/MALE/HumanMale.glb"
@export var character_class_id: int = 1
@export var character_scale: float = 1.0
@export var character_yaw_offset_degrees: float = 90.0
@export var animation_blend_time: float = 0.15

var _camera_pivot: Node3D
var _camera: Camera3D
var _visual: Node3D
var _character_root: Node3D
var _animation_player: AnimationPlayer
var _active_animation := ""
var _captured := false
var _yaw := 0.0
var _pitch := deg_to_rad(-18.0)
var _horizontal_velocity := Vector3.ZERO
var _flight_enabled := false
var _adt_cache: Dictionary = {}
var _player_input_source: PlayerInputSource


func _ready() -> void:
	_player_input_source = PLAYER_INPUT_SOURCE_SCRIPT.new()
	_camera_pivot = get_node_or_null(camera_pivot_path) as Node3D
	_camera = get_node_or_null(camera_path) as Camera3D
	_visual = get_node_or_null(visual_path) as Node3D
	if _camera:
		_camera.current = true
		_camera.far = 50000.0
	if spawn_at_tile_center:
		var spawn_tile = ADT_TILE_COORDINATE_SCRIPT.new(spawn_tile_x, spawn_tile_y)
		var half_tile_size := COORDINATE_MAPPER_SCRIPT.ADT_TILE_SIZE_YARDS * 0.5
		var spawn_local = ADT_TILE_LOCAL_POSITION_SCRIPT.new(half_tile_size, global_position.y, half_tile_size)
		var spawn_position = COORDINATE_MAPPER_SCRIPT.adt_tile_local_to_godot(spawn_tile, spawn_local)
		global_position = Vector3(spawn_position.x_units, spawn_position.y_units, spawn_position.z_units)
	_load_character_visual()
	var ground := _sample_ground_height(global_position)
	if is_finite(ground):
		global_position.y = ground + ground_offset
	_yaw = rotation.y
	_apply_camera_transform()


func _unhandled_input(event: InputEvent) -> void:
	if event.is_action_pressed(PLAYER_INPUT_ACTIONS_SCRIPT.CAMERA_ROTATE):
		_captured = true
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
	elif event.is_action_released(PLAYER_INPUT_ACTIONS_SCRIPT.CAMERA_ROTATE):
		_captured = false
		Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
	elif event.is_action_pressed(PLAYER_INPUT_ACTIONS_SCRIPT.CAMERA_ZOOM_IN):
		camera_distance = clampf(camera_distance - camera_zoom_step, camera_min_distance, camera_max_distance)
		_apply_camera_transform()
	elif event.is_action_pressed(PLAYER_INPUT_ACTIONS_SCRIPT.CAMERA_ZOOM_OUT):
		camera_distance = clampf(camera_distance + camera_zoom_step, camera_min_distance, camera_max_distance)
		_apply_camera_transform()
	elif event.is_action_pressed(PLAYER_INPUT_ACTIONS_SCRIPT.RELEASE_CURSOR):
		_captured = false
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED if _captured else Input.MOUSE_MODE_VISIBLE
	elif event.is_action_pressed(PLAYER_INPUT_ACTIONS_SCRIPT.DEBUG_TOGGLE_FLIGHT) and not event.is_echo():
		_flight_enabled = not _flight_enabled
		_horizontal_velocity = Vector3.ZERO

	if _captured and event is InputEventMouseMotion:
		_yaw -= event.relative.x * mouse_sensitivity
		_pitch = clampf(_pitch - event.relative.y * mouse_sensitivity, camera_pitch_min, camera_pitch_max)
		rotation.y = _yaw
		_apply_camera_transform()


func _physics_process(delta: float) -> void:
	var move_intent := _player_input_source.sample_move_intent()
	var target_velocity := Vector3.ZERO
	if move_intent.has_translation():
		target_velocity = _movement_vector(move_intent)
	if _flight_enabled:
		target_velocity.y += move_intent.vertical_axis * flight_vertical_speed * _debug_speed_multiplier(move_intent)

	_horizontal_velocity = _horizontal_velocity.move_toward(target_velocity, acceleration * delta)
	global_position += _horizontal_velocity * delta

	if not _flight_enabled:
		var ground := _sample_ground_height(global_position)
		if is_finite(ground):
			var target_y := ground + ground_offset
			global_position.y = lerpf(global_position.y, target_y, clampf(ground_snap_speed * delta, 0.0, 1.0))

	var horizontal_motion := Vector2(_horizontal_velocity.x, _horizontal_velocity.z)
	if _visual and horizontal_motion.length_squared() > 0.01:
		_visual.global_rotation.y = atan2(-_horizontal_velocity.x, -_horizontal_velocity.z)

	_update_character_animation(horizontal_motion.length_squared() > 0.04)

	_apply_camera_transform()


func _movement_vector(move_intent: MoveIntent) -> Vector3:
	var forward := -global_basis.z
	var right := global_basis.x
	if _flight_enabled and _camera_pivot:
		forward = -_camera_pivot.global_basis.z
		right = _camera_pivot.global_basis.x
	else:
		forward.y = 0.0
		right.y = 0.0
	forward = forward.normalized()
	right = right.normalized()

	var speed_z := run_speed if move_intent.forward_axis > 0.0 else backward_speed
	var speed_x := strafe_speed
	return (
		forward * move_intent.forward_axis * speed_z
		+ right * move_intent.strafe_axis * speed_x
	) * _debug_speed_multiplier(move_intent)


func _debug_speed_multiplier(move_intent: MoveIntent) -> float:
	return sprint_multiplier if move_intent.is_sprint_requested else 1.0


func _load_character_visual() -> void:
	if character_model_path.is_empty() or _visual == null:
		return
	if _visual is MeshInstance3D:
		(_visual as MeshInstance3D).mesh = null
	_visual.position = Vector3.ZERO

	if _character_root and is_instance_valid(_character_root):
		_character_root.queue_free()
	_character_root = null
	_animation_player = null
	_active_animation = ""

	var scene: PackedScene = load(character_model_path)
	if scene == null:
		push_warning("ThirdPersonWowController: cannot load character model: %s" % character_model_path)
		return

	_character_root = Node3D.new()
	_character_root.name = "CharacterModel"
	_character_root.set_script(GEOSET_CONTROLLER_SCRIPT)
	_character_root.scale = Vector3.ONE * maxf(character_scale, 0.001)
	_character_root.rotation_degrees.y = character_yaw_offset_degrees

	var instance := scene.instantiate()
	instance.name = character_model_path.get_file().get_basename()
	_character_root.add_child(instance)

	var compositor := Node.new()
	compositor.name = "CharacterTextureCompositor"
	compositor.set_script(TEXTURE_COMPOSITOR_SCRIPT)
	compositor.set("textures_dir", _character_textures_dir(character_model_path))
	compositor.set("extracted_dir", extracted_dir)
	_character_root.add_child(compositor)

	_visual.add_child(_character_root)
	await get_tree().process_frame
	_fit_character_to_ground()
	_apply_character_starter_outfit(compositor)
	_animation_player = _find_animation_player(_character_root)
	if _animation_player:
		_prepare_animation_player(_animation_player)
	_update_character_animation(false)


func _fit_character_to_ground() -> void:
	if _character_root == null:
		return
	var aabb := _calculate_aabb(_character_root)
	if aabb.size == Vector3.ZERO:
		return
	var local_min_y := aabb.position.y - _character_root.global_position.y
	_character_root.position.y -= local_min_y


func _apply_character_starter_outfit(compositor: Node) -> void:
	if _character_root == null or compositor == null:
		return
	var resolver: RefCounted = OUTFIT_RESOLVER_SCRIPT.new()
	if not resolver.call("load_dbcs", extracted_dir):
		return
	var inferred: Dictionary = resolver.call("infer_race_gender_from_model_path", character_model_path)
	var race := String(inferred.get("race", "Human"))
	var gender := String(inferred.get("gender", "Male"))
	var outfit: Dictionary = resolver.call("resolve_start_outfit", race, gender, character_class_id)
	if outfit.is_empty():
		return
	if compositor.has_method("set_equipment_components"):
		compositor.call("set_equipment_components", outfit.get("textures", PackedStringArray()))
	if _character_root.has_method("apply_outfit_defaults"):
		_character_root.call("apply_outfit_defaults", outfit)


func _update_character_animation(is_moving: bool) -> void:
	if _animation_player == null:
		return
	var wanted := _choose_animation(["Run", "Walk"]) if is_moving else _choose_animation(["Stand", "Idle"])
	if wanted.is_empty() or wanted == _active_animation:
		return
	_active_animation = wanted
	_animation_player.play(wanted, animation_blend_time)


func _prepare_animation_player(player: AnimationPlayer) -> void:
	player.playback_default_blend_time = animation_blend_time
	for animation_name in player.get_animation_list():
		var lower := String(animation_name).to_lower()
		if lower == "stand" or lower == "idle" or lower == "run" or lower == "walk" or lower.contains("stand") or lower.contains("run") or lower.contains("walk"):
			var animation := player.get_animation(animation_name)
			if animation:
				animation.loop_mode = Animation.LOOP_LINEAR


func _choose_animation(candidates: Array[String]) -> String:
	if _animation_player == null:
		return ""
	for candidate in candidates:
		if _animation_player.has_animation(candidate):
			return candidate
	var list := _animation_player.get_animation_list()
	for candidate in candidates:
		var lower := candidate.to_lower()
		for animation_name in list:
			if String(animation_name).to_lower().contains(lower):
				return String(animation_name)
	return ""


func _find_animation_player(root: Node) -> AnimationPlayer:
	if root is AnimationPlayer:
		return root
	for child in root.get_children():
		var found := _find_animation_player(child)
		if found:
			return found
	return null


func _calculate_aabb(root: Node) -> AABB:
	var result := AABB()
	var has_aabb := false
	for mesh_inst in _iter_mesh_instances(root):
		if mesh_inst.mesh == null:
			continue
		var local_aabb := mesh_inst.mesh.get_aabb()
		var global_aabb := mesh_inst.global_transform * local_aabb
		if not has_aabb:
			result = global_aabb
			has_aabb = true
		else:
			result = result.merge(global_aabb)
	return result if has_aabb else AABB()


func _iter_mesh_instances(root: Node) -> Array[MeshInstance3D]:
	var result: Array[MeshInstance3D] = []
	_collect_mesh_instances(root, result)
	return result


func _collect_mesh_instances(node: Node, result: Array[MeshInstance3D]) -> void:
	if node is MeshInstance3D:
		result.append(node)
	for child in node.get_children():
		_collect_mesh_instances(child, result)


func _character_textures_dir(model_path: String) -> String:
	return model_path.get_base_dir().path_join(model_path.get_file().get_basename() + "_textures")


func _apply_camera_transform() -> void:
	if _camera_pivot:
		_camera_pivot.position = Vector3(0.0, camera_height, 0.0)
		_camera_pivot.rotation.x = _pitch
	if _camera:
		_camera.position = Vector3(0.0, 0.0, camera_distance)
		_camera.rotation = Vector3.ZERO


func _sample_ground_height(world_pos: Vector3) -> float:
	var typed_world_position = GODOT_WORLD_POSITION_SCRIPT.new(world_pos.x, world_pos.y, world_pos.z)
	var tile_coordinate = COORDINATE_MAPPER_SCRIPT.godot_to_adt_tile(typed_world_position)
	var tile_local_position = COORDINATE_MAPPER_SCRIPT.godot_to_adt_tile_local(typed_world_position)
	var chunk_coordinate = COORDINATE_MAPPER_SCRIPT.adt_tile_local_to_chunk(tile_coordinate, tile_local_position)
	var data := _load_adt(tile_coordinate.tile_x, tile_coordinate.tile_y)
	if data.is_empty():
		return NAN

	var tile_origin := _get_tile_origin(data)
	var chunk_x := clampi(chunk_coordinate.chunk_x, 0, 15)
	var chunk_y := clampi(chunk_coordinate.chunk_y, 0, 15)
	var chunk := _find_chunk(data, chunk_x, chunk_y, tile_origin)
	if chunk.is_empty():
		return NAN

	var origin: Vector3 = chunk.get("origin", Vector3.ZERO)
	var chunk_local := world_pos - origin
	var gx := clampf(chunk_local.x / UNIT_SIZE, 0.0, 8.0)
	var gz := clampf(chunk_local.z / UNIT_SIZE, 0.0, 8.0)
	var x0 := clampi(int(floor(gx)), 0, 8)
	var z0 := clampi(int(floor(gz)), 0, 8)
	var x1 := mini(x0 + 1, 8)
	var z1 := mini(z0 + 1, 8)
	var fx := gx - float(x0)
	var fz := gz - float(z0)
	var heights: PackedFloat32Array = chunk.get("heights", PackedFloat32Array())
	if heights.size() < 145:
		return NAN

	var h00 := heights[_outer(z0, x0)]
	var h10 := heights[_outer(z0, x1)]
	var h01 := heights[_outer(z1, x0)]
	var h11 := heights[_outer(z1, x1)]
	var hx0 := lerpf(h00, h10, fx)
	var hx1 := lerpf(h01, h11, fx)
	return origin.y + lerpf(hx0, hx1, fz)


func _load_adt(tx: int, ty: int) -> Dictionary:
	var key := "%d_%d" % [tx, ty]
	if _adt_cache.has(key):
		return _adt_cache[key]
	if not ClassDB.class_exists("ADTLoader"):
		_adt_cache[key] = {}
		return {}

	var res_path := extracted_dir.path_join("World/Maps/%s/%s_%d_%d.adt" % [map_name, map_name, tx, ty])
	var abs_path := ProjectSettings.globalize_path(res_path)
	if not FileAccess.file_exists(abs_path):
		_adt_cache[key] = {}
		return {}

	var loader = ClassDB.instantiate("ADTLoader")
	var data: Dictionary = loader.call("load_adt", abs_path) if loader else {}
	_adt_cache[key] = data
	return data


func _find_chunk(data: Dictionary, chunk_x: int, chunk_y: int, tile_origin: Vector3) -> Dictionary:
	for chunk in data.get("chunks", []) as Array:
		if chunk.is_empty():
			continue
		var origin: Vector3 = chunk.get("origin", Vector3.ZERO)
		var local := origin - tile_origin
		var cx := clampi(int(round(local.x / CHUNK_SIZE)), 0, 15)
		var cy := clampi(int(round(local.z / CHUNK_SIZE)), 0, 15)
		if cx == chunk_x and cy == chunk_y:
			return chunk
	return {}


func _get_tile_origin(data: Dictionary) -> Vector3:
	var found := false
	var min_x := 0.0
	var min_z := 0.0
	for chunk in data.get("chunks", []) as Array:
		if chunk.is_empty():
			continue
		var origin: Vector3 = chunk.get("origin", Vector3.ZERO)
		if not found:
			min_x = origin.x
			min_z = origin.z
			found = true
		else:
			min_x = minf(min_x, origin.x)
			min_z = minf(min_z, origin.z)
	return Vector3(min_x, 0.0, min_z) if found else Vector3.ZERO


func _outer(row: int, col: int) -> int:
	return row * 17 + col