from . import parser
class Block:
    """Block object represents virtual chunk of chatdata.

    Parameter:
    ---------
    pos : int :
        index of this block on block list.

    first : int :
        videoOffsetTimeMs of the first chat_data 
        (chat_data[0])
        
    last : int :
        videoOffsetTimeMs of the last chat_data.
        (chat_data[-1])

        this value increases as fetching chatdata progresses.

    end : int :
        target videoOffsetTimeMs of last chat data for download,
        equals to first videoOffsetTimeMs of next block.
        when download worker reaches this offset, stop downloading.

    continuation : str :
        continuation param of last chat data.

    chat_data : list 

    done : bool :
        whether this block has been downloaded.
    
    remaining : int :
        remaining data to download.
        equals end - last.
    
    is_last : bool :
        whether this block is the last one in blocklist.

    splitting : bool :
        whether this block is in the process of splitting.
        while True, this block is excluded from duplicate split procedure.
    """
    
    __slots__ = ['first','last','end','continuation','chat_data','remaining',
        'done','is_last','splitting']

    def __init__(self,  first = 0, last = 0, end = 0,
                continuation = '', chat_data = [], is_last = False,
                splitting = False):
        self.first = first
        self.last = last
        self.end = end
        self.continuation = continuation
        self.chat_data = chat_data
        self.done = False
        self.remaining = self.end- self.last
        self.is_last = is_last
        self.splitting = splitting