@tool
class_name ModelLocalizerSettings
extends RefCounted

## Configuration for Model Localizer.
##
## Everything lives in `project.godot` under `model_localizer/*`, so settings are
## per-project and show up in **Project Settings → Model Localizer**. The plugin
## UI writes these for you.

const ROOT := "model_localizer/"

const KEY_AUTO_PROCESS := ROOT + "auto_process_scene_instances"
const KEY_SWAP := ROOT + "auto_swap_to_local"
const KEY_MOVE_DROPPED := ROOT + "auto_import_dropped_files"
const KEY_DROP_DIR := ROOT + "dropped_files_dir"
const KEY_OUTPUT_DIR := ROOT + "output_dir"
const KEY_SUFFIX := ROOT + "output_suffix"
const KEY_COLLISION := ROOT + "add_collision"
const KEY_SHAPE := ROOT + "collision_shape"
const KEY_BODY := ROOT + "collision_body"
const KEY_FORCE_CONVEX := ROOT + "force_convex_hull"
const KEY_LAYER := ROOT + "collision_layer"
const KEY_MASK := ROOT + "collision_mask"
const KEY_SKIP_DIRS := ROOT + "skip_dirs"

## NOTE: this is a function rather than a `const` dictionary on purpose.
## GDScript requires constant dictionary *values* to be constant expressions too,
## so referencing other constants or building a PackedStringArray inside a const
## dictionary fails to compile ("isn't a constant expression"). A static function
## has no such restriction and is equally cheap to call.
static func project_info() -> Dictionary:
	return {
		KEY_AUTO_PROCESS: {
			"name": KEY_AUTO_PROCESS,
			"type": TYPE_BOOL,
			"default": true,
			"hint_string": "Process models dragged into the open scene",
		},
		KEY_SWAP: {
			"name": KEY_SWAP,
			"type": TYPE_BOOL,
			"default": true,
			"hint_string": "Replace the dropped instance with the generated local scene",
		},
		KEY_MOVE_DROPPED: {
			"name": KEY_MOVE_DROPPED,
			"type": TYPE_BOOL,
			"default": true,
			"hint_string": "Move model files dropped in from outside into Dropped Files Dir",
		},
		KEY_DROP_DIR: {
			"name": KEY_DROP_DIR,
			"type": TYPE_STRING,
			"default": "res://models/",
			"hint": PROPERTY_HINT_DIR,
			"hint_string": "",
		},
		KEY_OUTPUT_DIR: {
			"name": KEY_OUTPUT_DIR,
			"type": TYPE_STRING,
			"default": "presets",
			"hint": PROPERTY_HINT_DIR,
			"hint_string": "Relative -> a subfolder of the model's own directory; "
				+ "absolute res:// path -> used as-is; empty -> next to the model",
		},
		KEY_SUFFIX: {
			"name": KEY_SUFFIX,
			"type": TYPE_STRING,
			"default": "_local",
		},
		KEY_COLLISION: {
			"name": KEY_COLLISION,
			"type": TYPE_BOOL,
			"default": true,
			"hint_string": "Bake collision shapes from the model's meshes",
		},
		KEY_SHAPE: {
			"name": KEY_SHAPE,
			"type": TYPE_INT,
			"default": 1,
			"hint": PROPERTY_HINT_ENUM,
			"hint_string": "Convex Hull,Trimesh,Box,Sphere,Capsule,Cylinder",
		},
		KEY_BODY: {
			"name": KEY_BODY,
			"type": TYPE_INT,
			"default": 0,
			"hint": PROPERTY_HINT_ENUM,
			"hint_string": "StaticBody3D,RigidBody3D,Area3D,CharacterBody3D",
		},
		KEY_FORCE_CONVEX: {
			"name": KEY_FORCE_CONVEX,
			"type": TYPE_BOOL,
			"default": true,
			"hint_string": "Convex Hull only: build the hull from real triangles "
				+ "(recommended for open meshes). Ignored by other shape types.",
		},
		KEY_LAYER: {
			"name": KEY_LAYER,
			"type": TYPE_INT,
			"default": 1,
			"hint": PROPERTY_HINT_LAYERS_3D_PHYSICS,
		},
		KEY_MASK: {
			"name": KEY_MASK,
			"type": TYPE_INT,
			"default": 1,
			"hint": PROPERTY_HINT_LAYERS_3D_PHYSICS,
		},
		KEY_SKIP_DIRS: {
			"name": KEY_SKIP_DIRS,
			"type": TYPE_PACKED_STRING_ARRAY,
			"default": PackedStringArray(["res://addons/", "res://.godot/"]),
			"hint": PROPERTY_HINT_ARRAY_TYPE,
			"hint_string": "String",
		},
	}


static func _info(key: String) -> Dictionary:
	var all := project_info()
	if all.has(key):
		return all[key]
	return {"name": key, "type": TYPE_NIL, "default": null}


## Register every setting with ProjectSettings so they appear in the UI and carry
## a usable default even before the user touches anything.
static func install() -> void:
	var all := project_info()
	for key in all:
		var info: Dictionary = all[key]
		if not ProjectSettings.has_setting(key):
			ProjectSettings.set_setting(key, info["default"])
		ProjectSettings.add_property_info(info)
		# Mark the default as the initial value so an untouched setting is not
		# reported as a modified project setting.
		ProjectSettings.set_initial_value(key, info["default"])


static func get_bool(key: String) -> bool:
	return bool(ProjectSettings.get_setting(key, _info(key)["default"]))


static func get_int(key: String) -> int:
	return int(ProjectSettings.get_setting(key, _info(key)["default"]))


static func get_string(key: String) -> String:
	return String(ProjectSettings.get_setting(key, _info(key)["default"]))


static func get_dirs(key: String) -> PackedStringArray:
	var value = ProjectSettings.get_setting(key, _info(key)["default"])
	if value is PackedStringArray:
		return value
	var out := PackedStringArray()
	if value is Array:
		for v in value:
			out.append(String(v))
	return out


static func set_value(key: String, value) -> void:
	ProjectSettings.set_setting(key, value)


static func shape_type() -> ModelLocalizer.ShapeType:
	return clampi(get_int(KEY_SHAPE), 0,
		ModelLocalizer.SHAPE_TYPE_NAMES.size() - 1) as ModelLocalizer.ShapeType


static func body_type() -> ModelLocalizer.BodyType:
	return clampi(get_int(KEY_BODY), 0,
		ModelLocalizer.BODY_TYPE_NAMES.size() - 1) as ModelLocalizer.BodyType


## The resolved output directory for `model_res_path`, with a trailing slash.
##
## `output_dir` may be:
##   * empty            -> the model's own directory
##   * a relativ path   -> a subfolder of the model's directory (default: `presets/`)
##   * a `res://` path  -> used exactly as given
static func resolved_output_dir(model_res_path: String) -> String:
	var model_dir := model_res_path.get_base_dir()
	if model_dir.is_empty():
		model_dir = "res://"
	var configured := get_string(KEY_OUTPUT_DIR).strip_edges().replace("\\", "/")

	if configured.is_empty():
		return _with_trailing_slash(model_dir)
	if configured.begins_with("res://"):
		return _with_trailing_slash(configured)
	var relative := configured.trim_prefix("./").trim_prefix("/")
	if relative.is_empty():
		return _with_trailing_slash(model_dir)
	return _with_trailing_slash(model_dir.path_join(relative))


static func _with_trailing_slash(path: String) -> String:
	if path.ends_with("/"):
		return path
	return path + "/"


## Where the generated scene for `model_res_path` should be written.
static func output_path_for(model_res_path: String, fallback_suffix: String = "_local") -> String:
	var suffix := get_string(KEY_SUFFIX)
	if suffix.is_empty():
		suffix = fallback_suffix
	return resolved_output_dir(model_res_path) \
		+ model_res_path.get_file().get_basename() + suffix + ".tscn"


## True when `path` is inside a directory the plugin must never touch.
##
## The generated scenes do not need protecting here: the filesystem scan only
## looks at model extensions, and a generated scene is always a `.tscn`.
static func should_skip(path: String) -> bool:
	var p := path.replace("\\", "/")
	for dir in get_dirs(KEY_SKIP_DIRS):
		var d := dir.replace("\\", "/")
		if not d.ends_with("/"):
			d += "/"
		if p.begins_with(d):
			return true
	return false