class_name Datetime extends RefCounted

const WEEKDAYS = {
        "ru": ["вторник", "среда", "четверг", "пятница", "суббота", "воскресенье"],
        "en": ["tuesday", "wednesday", "thursday", "friday", "saturday", "sunday"],
    }

# var readable is unused and removed to avoid confusion

static func init_datetime() -> Dictionary:
    const SEC_IN_YEAR := 31556925.9747
    const RATIO := SEC_IN_YEAR/432/24/60/60
    var now := int((1970 * SEC_IN_YEAR + Time.get_unix_time_from_system()) / RATIO - 1970 * SEC_IN_YEAR)
    var adt = Time.get_datetime_dict_from_unix_time(now)
    var dt: int = adt["second"] + 60 * adt["minute"] + 3600 * adt["hour"] + \
         + 86400 * adt["day"] +  3110400 * adt["month"] + 37324800 * adt["year"]
    return _to_adventure_dict_dt(dt)


static func add_timedelta(dt, delta_in_min: int) -> int:
    const TIME_DELTA_DEVIATION: float = 0.2
    var delta_in_sec = delta_in_min * 60
    var delta := int(TIME_DELTA_DEVIATION * delta_in_sec)
    return dt + delta_in_sec + randi_range(-delta, delta)


static func _to_adventure_dict_dt(dt_from: int) -> Dictionary:
    var dt := {}
    dt["dt"] = dt_from
    @warning_ignore("integer_division")
    dt["year"] = dt_from / 37324800
    dt_from %= 37324800
    @warning_ignore("integer_division")
    dt["month"] = dt_from / 3110400
    dt_from %= 3110400
    @warning_ignore("integer_division")
    dt["day"] = dt_from / 86400
    dt["weekday"] = dt["day"] % 6
    
    # TODO replace with language from global settings
    dt["weekdayname"] = WEEKDAYS["ru"][dt.weekday]
    dt_from %= 86400
    @warning_ignore("integer_division")
    dt["hour"] = dt_from / 3600
    dt_from %= 3600
    @warning_ignore("integer_division")
    dt["minute"] = dt_from / 60
    dt["second"] = dt_from % 60
    return dt