from . import asyncdl
from . import duplcheck 
from . import parser
from .. videoinfo import VideoInfo
from ... import config
from ... exceptions import InvalidVideoIdException

logger = config.logger(__name__)
headers=config.headers

class Extractor:
    def __init__(self, video_id, div, callback = None, processor = None):
        if not isinstance(div ,int) or div < 1:
            raise ValueError('div must be positive integer.')
        elif div > 10:
            div = 10
        self.video_id = video_id
        self.div = div
        self.callback = callback
        self.processor = processor
        self.duration = self._get_duration_of_video(video_id)
        self.blocks = []

    def _get_duration_of_video(self, video_id):
        duration = 0
        try:
            duration = VideoInfo(video_id).get_duration()
        except InvalidVideoIdException:
            raise
        return duration

    def _ready_blocks(self):
        blocks = asyncdl.ready_blocks(
            self.video_id, self.duration, self.div, self.callback)
        self.blocks = [block for block in blocks if block]
        return self  

    def _remove_duplicate_head(self):
        self.blocks = duplcheck.remove_duplicate_head(self.blocks)
        return self

    def _set_block_end(self):
        for i in range(len(self.blocks)-1):
            self.blocks[i].end = self.blocks[i+1].first
        self.blocks[-1].end = self.duration*1000
        self.blocks[-1].is_last =True
        return self

    def _remove_overlap(self):
        self.blocks = duplcheck.remove_overlap(self.blocks)
        return self

    def _download_blocks(self):
        asyncdl.fetch_patch(self.callback, self.blocks, self.video_id)
        return self

    def _remove_duplicate_tail(self):
        self.blocks = duplcheck.remove_duplicate_tail(self.blocks)
        return self

    def _combine(self):
        ret = []
        for block in self.blocks:
            ret.extend(block.chat_data) 
        return ret

    def _execute_extract_operations(self):
        return (
            self._ready_blocks()
                ._remove_duplicate_head()
                ._set_block_end()
                ._remove_overlap()
                ._download_blocks()
                ._remove_duplicate_tail()
                ._combine()
        )

    def extract(self):
        if self.duration == 0:
            print("video is not archived.")
            return []
        data = self._execute_extract_operations()
        if self.processor is None:
           return data
        return self.processor.process(
            [{'video_id':None,'timeout':1,'chatdata' : (action
            ["replayChatItemAction"]["actions"][0] for action in data)}]
    )

    def cancel(self):
        asyncdl.cancel()