var _utils = load("res://addons/gut/utils.gd").get_instance()
var _strutils = _utils.Strutils.new()
var _max_length = 100
var _should_compare_int_to_float = true

const MISSING = "|__missing__gut__compare__value__|"


func _cannot_compare_text(v1, v2):
	return str(
		"Cannot compare ", _strutils.types[typeof(v1)], " with ", _strutils.types[typeof(v2)], "."
	)


func _make_missing_string(text):
	return "<missing " + text + ">"


func _create_missing_result(v1, v2, text):
	var to_return = null
	var v1_str = format_value(v1)
	var v2_str = format_value(v2)

	if typeof(v1) == TYPE_STRING and v1 == MISSING:
		v1_str = _make_missing_string(text)
		to_return = _utils.CompareResult.new()
	elif typeof(v2) == TYPE_STRING and v2 == MISSING:
		v2_str = _make_missing_string(text)
		to_return = _utils.CompareResult.new()

	if to_return != null:
		to_return.summary = str(v1_str, " != ", v2_str)
		to_return.are_equal = false

	return to_return


func simple(v1, v2, missing_string = ""):
	var missing_result = _create_missing_result(v1, v2, missing_string)
	if missing_result != null:
		return missing_result

	var result = _utils.CompareResult.new()
	var cmp_str = null
	var extra = ""

	var tv1 = typeof(v1)
	var tv2 = typeof(v2)

	# print(tv1, '::', tv2, '   ', _strutils.types[tv1], '::', _strutils.types[tv2])
	if (
		_should_compare_int_to_float
		and [TYPE_INT, TYPE_FLOAT].has(tv1)
		and [TYPE_INT, TYPE_FLOAT].has(tv2)
	):
		result.are_equal = v1 == v2
	elif [TYPE_STRING, TYPE_STRING_NAME].has(tv1) and [TYPE_STRING, TYPE_STRING_NAME].has(tv2):
		result.are_equal = v1 == v2
	elif _utils.are_datatypes_same(v1, v2):
		result.are_equal = v1 == v2

		if typeof(v1) == TYPE_DICTIONARY or typeof(v1) == TYPE_ARRAY:
			var sub_result = _utils.DiffTool.new(v1, v2, _utils.DIFF.DEEP)
			result.summary = sub_result.get_short_summary()
			if !sub_result.are_equal:
				extra = ".\n" + sub_result.get_short_summary()
	else:
		cmp_str = "!="
		result.are_equal = false
		extra = str(".  ", _cannot_compare_text(v1, v2))

	cmp_str = get_compare_symbol(result.are_equal)
	result.summary = str(format_value(v1), " ", cmp_str, " ", format_value(v2), extra)

	return result


func shallow(v1, v2):
	var result = null
	if _utils.are_datatypes_same(v1, v2):
		if typeof(v1) in [TYPE_ARRAY, TYPE_DICTIONARY]:
			result = _utils.DiffTool.new(v1, v2, _utils.DIFF.DEEP)
		else:
			result = simple(v1, v2)
	else:
		result = simple(v1, v2)

	return result


func deep(v1, v2):
	var result = null

	if _utils.are_datatypes_same(v1, v2):
		if typeof(v1) in [TYPE_ARRAY, TYPE_DICTIONARY]:
			result = _utils.DiffTool.new(v1, v2, _utils.DIFF.DEEP)
		else:
			result = simple(v1, v2)
	else:
		result = simple(v1, v2)

	return result


func format_value(val, max_val_length = _max_length):
	return _strutils.truncate_string(_strutils.type2str(val), max_val_length)


func compare(v1, v2, diff_type = _utils.DIFF.SIMPLE):
	var result = null
	if diff_type == _utils.DIFF.SIMPLE:
		result = simple(v1, v2)
	elif diff_type == _utils.DIFF.DEEP:
		result = deep(v1, v2)

	return result


func get_should_compare_int_to_float():
	return _should_compare_int_to_float


func set_should_compare_int_to_float(should_compare_int_float):
	_should_compare_int_to_float = should_compare_int_float


func get_compare_symbol(is_equal):
	if is_equal:
		return "=="
	else:
		return "!="