from copy import deepcopy
from nullptr.util import sg

class Reference:
  def __init__(self, typ, symbol, store):
    self.typ = typ
    self.symbol = symbol
    self.store = store
  
  @classmethod
  def create(cls, obj):
    o = cls(type(obj), obj.symbol, obj.store)
    return o
    
  def resolve(self):
    return self.store.get(self.typ, self.symbol)
    
  def __repr__(self):
    return f'*REF*{self.symbol}.{self.typ.ext()}'

class Base:
  identifier = 'symbol'
  
  def __init__(self, symbol, store):
    self.disable_dirty = True
    self.file_offset = None
    self.store = store
    self.symbol = symbol
    self.define()
    self.disable_dirty = False
    
  @classmethod
  def ext(cls):
    raise NotImplementedError('no ext')
    
  def define(self):
    pass
    
  def __hash__(self):
    return hash((str(type(self)), self.symbol))
  
  def __eq__(self, other):
    return type(self) == type(other) and self.symbol == other.symbol
  
  def get_system(self):
    parts = self.symbol.split('-')
    system_str = f'{parts[0]}-{parts[1]}'
    system = self.store.get('System', system_str, create=True)
    return system
    
  def seta(self, attr,  d, name=None, interp=None):
    if name is None:
      name = attr
    val = sg(d, name)
    if val is not None:
      if interp is not None:
        val = interp(val)
      setattr(self, attr, val)
  
  def setlst(self, attr, d, name, member, interp=None):
    val = sg(d, name)
    if val is not None:
      lst = []
      for x in val:
        val = sg(x, member)
        if interp is not None:
          val = interp(val)
        lst.append(val)
      setattr(self, attr, lst)
    
  def __setattr__(self, name, value):
    if name not in ['symbol','store','disable_dirty', 'file_offset'] and not self.disable_dirty:
      self.store.dirty(self)
    if issubclass(type(value), Base):
      value = Reference.create(value)
    super().__setattr__(name, value)
  
  def __getattribute__(self, nm):
    val = super().__getattribute__(nm)
    if type(val) == Reference:
      val = val.resolve()
    return val
  
  def update(self, d):
    pass
  
  def is_expired(self):
    return False
    
  def load(self, d):
    self.disable_dirty = True
    self.__dict__.update(d)
    self.disable_dirty = False
    
  def type(self):
    return self.__class__.__name__
  
  def __str__(self):
    return self.f()
    
  def __repr__(self):
    return self.f()
    
  def f(self, detail=1):
    r = self.symbol
    if detail > 1:
      r += '.' + self.ext()
    return r