# ##############################################################################
#(G)odot (U)nit (T)est class
#
# ##############################################################################
# The MIT License (MIT)
# =====================
#
# Copyright (c) 2020 Tom "Butch" Wesley
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# ##############################################################################
# Description
# -----------
# ##############################################################################

# ------------------------------------------------------------------------------
# Utility class to hold the local and built in methods separately.  Add all local
# methods FIRST, then add built ins.
# ------------------------------------------------------------------------------
class ScriptMethods:
	# List of methods that should not be overloaded when they are not defined
	# in the class being doubled.  These either break things if they are
	# overloaded or do not have a "super" equivalent so we can't just pass
	# through.
	var _blacklist = [
		"has_method",
		"get_script",
		"get",
		"_notification",
		"get_path",
		"_enter_tree",
		"_exit_tree",
		"_process",
		"_draw",
		"_physics_process",
		"_input",
		"_unhandled_input",
		"_unhandled_key_input",
		"_set",
		"_get",  # probably
		"emit_signal",  # can't handle extra parameters to be sent with signal.
		"draw_mesh",  # issue with one parameter, value is `Null((..), (..), (..))``
		"_to_string",  # nonexistant function ._to_string
		"_get_minimum_size",  # Nonexistent function _get_minimum_size
	]

	# These methods should not be included in the double.
	var _skip = [
		# There is an init in the template.  There is also no real reason
		# to include this method since it will always be called, it has no
		# return value, and you cannot prevent super from being called.
		"_init"
	]

	var built_ins = []
	var local_methods = []
	var _method_names = []

	func is_blacklisted(method_meta):
		return _blacklist.find(method_meta.name) != -1

	func _add_name_if_does_not_have(method_name):
		if _skip.has(method_name):
			return false
		var should_add = _method_names.find(method_name) == -1
		if should_add:
			_method_names.append(method_name)
		return should_add

	func add_built_in_method(method_meta):
		var did_add = _add_name_if_does_not_have(method_meta.name)
		if did_add and !is_blacklisted(method_meta):
			built_ins.append(method_meta)

	func add_local_method(method_meta):
		var did_add = _add_name_if_does_not_have(method_meta.name)
		if did_add:
			local_methods.append(method_meta)

	func to_s():
		var text = "Locals\n"
		for i in range(local_methods.size()):
			text += str("  ", local_methods[i].name, "\n")
		text += "Built-Ins\n"
		for i in range(built_ins.size()):
			text += str("  ", built_ins[i].name, "\n")
		return text


# ------------------------------------------------------------------------------
# Helper class to deal with objects and inner classes.
# ------------------------------------------------------------------------------
class ObjectInfo:
	var _path = null
	var _subpaths = []
	var _utils = load("res://addons/gut/utils.gd").get_instance()
	var _lgr = _utils.get_logger()
	var _method_strategy = null
	var make_partial_double = false
	var scene_path = null
	var _native_class = null
	var _native_class_name = null
	var _singleton_instance = null
	var _singleton_name = null

	func _init(path, subpath = null):
		_path = path
		if subpath != null:
			_subpaths = Array(subpath.split("/"))

	# Returns an instance of the class/inner class
	func instantiate():
		var to_return = null

		if _singleton_instance != null:
			to_return = _singleton_instance
		elif is_native():
			to_return = _native_class.new()
		else:
			to_return = get_loaded_class().new()

		return to_return

	# Can't call it get_class because that is reserved so it gets this ugly name.
	# Loads up the class and then any inner classes to give back a reference to
	# the desired Inner class (if there is any)
	func get_loaded_class():
		var LoadedClass = load(_path)
		for i in range(_subpaths.size()):
			LoadedClass = LoadedClass.get(_subpaths[i])
		return LoadedClass

	func to_s():
		return str(_path, "[", get_subpath(), "]")

	func get_path():
		return _path

	func get_subpath():
		return "/".join(PackedStringArray(_subpaths))

	func has_subpath():
		return _subpaths.size() != 0

	func get_method_strategy():
		return _method_strategy

	func set_method_strategy(method_strategy):
		_method_strategy = method_strategy

	func is_native():
		return _native_class != null

	func set_native_class(native_class):
		_native_class = native_class
		var inst = native_class.new()
		_native_class_name = inst.get_class()
		_path = _native_class_name
		if !inst is RefCounted:
			inst.free()

	func get_native_class_name():
		return _native_class_name

	func get_singleton_instance():
		return _singleton_instance

	func get_singleton_name():
		return _singleton_name

	func set_singleton_name(singleton_name):
		_singleton_name = singleton_name
		_singleton_instance = _utils.get_singleton_by_name(_singleton_name)

	func is_singleton():
		return _singleton_instance != null

	func get_extends_text():
		var extend = null
		if is_singleton():
			extend = str("# Double of singleton ", _singleton_name, ", base class is RefCounted")
		elif is_native():
			var native = get_native_class_name()
			if native.begins_with("_"):
				native = native.substr(1)
			extend = str("extends ", native)
		else:
			extend = str("extends '", get_path(), "'")

		if has_subpath():
			extend += str(".", get_subpath().replace("/", "."))

		return extend

	func get_constants_text():
		if !is_singleton():
			return ""

		# do not include constants defined in the super class which for
		# singletons stubs is RefCounted.
		var exclude_constants = Array(ClassDB.class_get_integer_constant_list("RefCounted"))
		var text = str("# -----\n# ", _singleton_name, " Constants\n# -----\n")
		var constants = ClassDB.class_get_integer_constant_list(_singleton_name)
		for c in constants:
			if !exclude_constants.has(c):
				var value = ClassDB.class_get_integer_constant(_singleton_name, c)
				text += str("const ", c, " = ", value, "\n")

		return text

	func get_properties_text():
		if !is_singleton():
			return ""

		var text = str("# -----\n# ", _singleton_name, " Properties\n# -----\n")
		var props = ClassDB.class_get_property_list(_singleton_name)
		for prop in props:
			var accessors = {"setter": null, "getter": null}
			var prop_text = str("var ", prop["name"])

			var getter_name = "get_" + prop["name"]
			if ClassDB.class_has_method(_singleton_name, getter_name):
				accessors.getter = getter_name
			else:
				getter_name = "is_" + prop["name"]
				if ClassDB.class_has_method(_singleton_name, getter_name):
					accessors.getter = getter_name

			var setter_name = "set_" + prop["name"]
			if ClassDB.class_has_method(_singleton_name, setter_name):
				accessors.setter = setter_name

			var setget_text = ""
			if accessors.setter != null and accessors.getter != null:
				setget_text = str("setget ", accessors.setter, ", ", accessors.getter)
			else:
				# never seen this message show up, but it should show up if we
				# get misbehaving singleton.
				_lgr.error(
					str(
						"Could not find setget methods for property:  ",
						_singleton_name,
						".",
						prop["name"]
					)
				)

			text += str(prop_text, " ", setget_text, "\n")

		return text


# ------------------------------------------------------------------------------
# Allows for interacting with a file but only creating a string.  This was done
# to ease the transition from files being created for doubles to loading
# doubles from a string.  This allows the files to be created for debugging
# purposes since reading a file is easier than reading a dumped out string.
# ------------------------------------------------------------------------------
class FileOrString:
	extends File

	var _do_file = false
	var _contents = ""
	var _path = null

	func open(path, mode):
		_path = path
		if _do_file:
			return super.open(path, mode)
		else:
			return OK

	func close():
		if _do_file:
			return super.close()

	func store_string(s):
		if _do_file:
			super.store_string(s)
		_contents += s

	func get_contents():
		return _contents

	func get_path():
		return _path

	func load_it():
		if _contents != "":
			var script = GDScript.new()
			script.set_source_code(get_contents())
			script.reload()
			return script
		else:
			return load(_path)


# ------------------------------------------------------------------------------
# A stroke of genius if I do say so.  This allows for doubling a scene without
# having  to write any files.  By overloading the "instance" method  we can
# make whatever we want.
# ------------------------------------------------------------------------------
class PackedSceneDouble:
	extends PackedScene
	var _script = null
	var _scene = null

	func set_script_obj(obj):
		_script = obj

	func instance(edit_state = 0):
		var inst = _scene.instantiate(edit_state)
		if _script != null:
			inst.set_script(_script)
		return inst

	func load_scene(path):
		_scene = load(path)


# ------------------------------------------------------------------------------
# START Doubler
# ------------------------------------------------------------------------------
var _utils = load("res://addons/gut/utils.gd").get_instance()

var _ignored_methods = _utils.OneToMany.new()
var _stubber = _utils.Stubber.new()
var _lgr = _utils.get_logger()
var _method_maker = _utils.MethodMaker.new()

var _output_dir = "user://gut_temp_directory"
var _double_count = 0  # used in making files names unique
var _spy = null
var _gut = null
var _strategy = null
var _base_script_text = _utils.get_file_as_text(
	"res://addons/gut/double_templates/script_template.txt"
)
var _make_files = false
# used by tests for debugging purposes.
var _print_source = false


func _init(strategy = _utils.DOUBLE_STRATEGY.PARTIAL):
	set_logger(_utils.get_logger())
	_strategy = strategy


# ###############
# Private
# ###############
func _get_indented_line(indents, text):
	var to_return = ""
	for _i in range(indents):
		to_return += "\t"
	return str(to_return, text, "\n")


func _stub_to_call_super(obj_info, method_name):
	if _utils.non_super_methods.has(method_name):
		return

	var path = obj_info.get_path()
	if obj_info.is_singleton():
		path = obj_info.get_singleton_name()
	elif obj_info.scene_path != null:
		path = obj_info.scene_path

	var params = _utils.StubParams.new(path, method_name, obj_info.get_subpath())
	params.to_call_super()
	_stubber.add_stub(params)


func _get_base_script_text(obj_info, override_path):
	var path = obj_info.get_path()
	if override_path != null:
		path = override_path

	var stubber_id = -1
	if _stubber != null:
		stubber_id = _stubber.get_instance_id()

	var spy_id = -1
	if _spy != null:
		spy_id = _spy.get_instance_id()

	var gut_id = -1
	if _gut != null:
		gut_id = _gut.get_instance_id()

	var values = {
		# Top  sections
		"extends": obj_info.get_extends_text(),
		"constants": obj_info.get_constants_text(),
		"properties": obj_info.get_properties_text(),
		# metadata values
		"path": path,
		"subpath": obj_info.get_subpath(),
		"stubber_id": stubber_id,
		"spy_id": spy_id,
		"gut_id": gut_id,
		"singleton_name": _utils.nvl(obj_info.get_singleton_name(), ""),
		"is_partial": str(obj_info.make_partial_double).to_lower()
	}

	return _base_script_text.format(values)


func _write_file(obj_info, dest_path, override_path = null):
	var base_script = _get_base_script_text(obj_info, override_path)
	var script_methods = _get_methods(obj_info)
	var super_name = ""
	var path = ""

	if obj_info.is_singleton():
		super_name = obj_info.get_singleton_name()
	else:
		path = obj_info.get_path()

	var f = FileOrString.new()
	f._do_file = _make_files
	var f_result = f.open(dest_path, f.WRITE)

	if f_result != OK:
		_lgr.error(str("Error creating file ", dest_path))
		_lgr.error(str("Could not create double for :", obj_info.to_s()))
		return

	f.store_string(base_script)

	for i in range(script_methods.local_methods.size()):
		f.store_string(_get_func_text(script_methods.local_methods[i], path, super_name))

	for i in range(script_methods.built_ins.size()):
		_stub_to_call_super(obj_info, script_methods.built_ins[i].name)
		f.store_string(_get_func_text(script_methods.built_ins[i], path, super_name))

	f.close()
	if _print_source:
		print(f.get_contents())
	return f


func _double_scene_and_script(scene_info):
	var to_return = PackedSceneDouble.new()
	to_return.load_scene(scene_info.get_path())

	var inst = load(scene_info.get_path()).instantiate()
	var script_path = null
	if inst.get_script():
		script_path = inst.get_script().get_path()
	inst.free()

	if script_path:
		var oi = ObjectInfo.new(script_path)
		oi.set_method_strategy(scene_info.get_method_strategy())
		oi.make_partial_double = scene_info.make_partial_double
		oi.scene_path = scene_info.get_path()
		to_return.set_script_obj(_double(oi, scene_info.get_path()).load_it())

	return to_return


func _get_methods(object_info):
	var obj = object_info.instantiate()
	# any method in the script or super script
	var script_methods = ScriptMethods.new()
	var methods = obj.get_method_list()

	if !object_info.is_singleton() and !(obj is RefCounted):
		obj.free()

	# first pass is for local methods only
	for i in range(methods.size()):
		if object_info.is_singleton():
			#print(methods[i].name, " :: ", methods[i].flags, " :: ", methods[i].id)
			#print("    ", methods[i])

			# It appears that the ID for methods upstream from a singleton are
			# below 200.  Initially it was thought that singleton specific methods
			# were above 1000.  This was true for Input but not for OS.  I've
			# changed the condition to be > 200 instead of > 1000.  It will take
			# some investigation to figure out if this is right, but it works
			# for now.  Someone either find an issue and open a bug, or this will
			# just exist like this.  Sorry future me (or someone else).
			if methods[i].id > 200 and methods[i].flags in [1, 9]:
				script_methods.add_local_method(methods[i])

		# 65 is a magic number for methods in script, though documentation
		# says 64.  This picks up local overloads of base class methods too.
		# See MethodFlags in @GlobalScope
		elif (
			methods[i].flags == 65
			and !_ignored_methods.has(object_info.get_path(), methods[i]["name"])
		):
			script_methods.add_local_method(methods[i])

	if object_info.get_method_strategy() == _utils.DOUBLE_STRATEGY.FULL:
		# second pass is for anything not local
		for j in range(methods.size()):
			# 65 is a magic number for methods in script, though documentation
			# says 64.  This picks up local overloads of base class methods too.
			if (
				methods[j].flags != 65
				and !_ignored_methods.has(object_info.get_path(), methods[j]["name"])
			):
				script_methods.add_built_in_method(methods[j])

	return script_methods


func _get_inst_id_ref_str(inst):
	var ref_str = "null"
	if inst:
		ref_str = str("instance_from_id(", inst.get_instance_id(), ")")
	return ref_str


func _get_func_text(method_hash, path, super = ""):
	var override_count = null
	if _stubber != null:
		override_count = _stubber.get_parameter_count(path, method_hash.name)

	var text = _method_maker.get_function_text(method_hash, path, override_count, super) + "\n"

	return text


# returns the path to write the double file to
func _get_temp_path(object_info):
	var file_name = null
	var extension = null

	if object_info.is_singleton():
		file_name = str(object_info.get_singleton_instance())
		extension = "gd"
	elif object_info.is_native():
		file_name = object_info.get_native_class_name()
		extension = "gd"
	else:
		file_name = object_info.get_path().get_file().get_basename()
		extension = object_info.get_path().get_extension()

	if object_info.has_subpath():
		file_name += "__" + object_info.get_subpath().replace("/", "__")

	file_name += str("__dbl", _double_count, "__.", extension)

	var to_return = _output_dir.plus_file(file_name)
	return to_return


func _double(obj_info, override_path = null):
	var temp_path = _get_temp_path(obj_info)
	var result = _write_file(obj_info, temp_path, override_path)
	_double_count += 1
	return result


func _double_script(path, make_partial, strategy):
	var oi = ObjectInfo.new(path)
	oi.make_partial_double = make_partial
	oi.set_method_strategy(strategy)
	return _double(oi).load_it()


func _double_inner(path, subpath, make_partial, strategy):
	var oi = ObjectInfo.new(path, subpath)
	oi.set_method_strategy(strategy)
	oi.make_partial_double = make_partial
	return _double(oi).load_it()


func _double_scene(path, make_partial, strategy):
	var oi = ObjectInfo.new(path)
	oi.set_method_strategy(strategy)
	oi.make_partial_double = make_partial
	return _double_scene_and_script(oi)


func _double_gdnative(native_class, make_partial, strategy):
	var oi = ObjectInfo.new(null)
	oi.set_native_class(native_class)
	oi.set_method_strategy(strategy)
	oi.make_partial_double = make_partial
	return _double(oi).load_it()


func _double_singleton(singleton_name, make_partial, strategy):
	var oi = ObjectInfo.new(null)
	oi.set_singleton_name(singleton_name)
	oi.set_method_strategy(_utils.DOUBLE_STRATEGY.PARTIAL)
	oi.make_partial_double = make_partial
	return _double(oi).load_it()


# ###############
# Public
# ###############
func get_output_dir():
	return _output_dir


func set_output_dir(output_dir):
	if output_dir != null:
		_output_dir = output_dir
		if _make_files:
			var d = Directory.new()
			d.make_dir_recursive(output_dir)


func get_spy():
	return _spy


func set_spy(spy):
	_spy = spy


func get_stubber():
	return _stubber


func set_stubber(stubber):
	_stubber = stubber


func get_logger():
	return _lgr


func set_logger(logger):
	_lgr = logger
	_method_maker.set_logger(logger)


func get_strategy():
	return _strategy


func set_strategy(strategy):
	_strategy = strategy


func get_gut():
	return _gut


func set_gut(gut):
	_gut = gut


func partial_double_scene(path, strategy = _strategy):
	return _double_scene(path, true, strategy)


# double a scene
func double_scene(path, strategy = _strategy):
	return _double_scene(path, false, strategy)


# double a script/object
func double(path, strategy = _strategy):
	return _double_script(path, false, strategy)


func partial_double(path, strategy = _strategy):
	return _double_script(path, true, strategy)


func partial_double_inner(path, subpath, strategy = _strategy):
	return _double_inner(path, subpath, true, strategy)


# double an inner class in a script
func double_inner(path, subpath, strategy = _strategy):
	return _double_inner(path, subpath, false, strategy)


# must always use FULL strategy since this is a native class and you won't get
# any methods if you don't use FULL
func double_gdnative(native_class):
	return _double_gdnative(native_class, false, _utils.DOUBLE_STRATEGY.FULL)


# must always use FULL strategy since this is a native class and you won't get
# any methods if you don't use FULL
func partial_double_gdnative(native_class):
	return _double_gdnative(native_class, true, _utils.DOUBLE_STRATEGY.FULL)


func double_singleton(name):
	return _double_singleton(name, false, _utils.DOUBLE_STRATEGY.PARTIAL)


func partial_double_singleton(name):
	return _double_singleton(name, true, _utils.DOUBLE_STRATEGY.PARTIAL)


func clear_output_directory():
	if !_make_files:
		return false

	var did = false
	if _output_dir.find("user://") == 0:
		var d = Directory.new()
		var result = d.open(_output_dir)
		# BIG GOTCHA HERE.  If it cannot open the dir w/ erro 31, then the
		# directory becomes res:// and things go on normally and gut clears out
		# out res:// which is SUPER BAD.
		if result == OK:
			d.list_dir_begin() # TODOGODOT4 fill missing arguments https://github.com/godotengine/godot/pull/40547
			var f = d.get_next()
			while f != "":
				d.remove_at(f)
				f = d.get_next()
				did = true
	return did


func delete_output_directory():
	var did = clear_output_directory()
	if did:
		var d = Directory.new()
		d.remove_at(_output_dir)


func add_ignored_method(path, method_name):
	_ignored_methods.add(path, method_name)


func get_ignored_methods():
	return _ignored_methods


func get_make_files():
	return _make_files


func set_make_files(make_files):
	_make_files = make_files
	set_output_dir(_output_dir)


func get_method_maker():
	return _method_maker