import threading
from concurrent.futures import ThreadPoolExecutor, wait

from common.log import logger
from crawler.Task import Task
from crawler.services.basics import BasicSearch
from crawler.utils import (
    extract_base_url,
    extract_page_title,
    extract_domain,
    err_details,
)


class DataExcavate(BasicSearch):

    def __init__(self, excavate_workers=1, loop_excavate_interval=60, **kwargs):
        super(DataExcavate, self).__init__(**kwargs)
        self._interval = loop_excavate_interval
        self._workers = excavate_workers

    def retrieve_site(self, task: Task):
        logger.info(f'[数据挖掘]开始请求 - {task["url"]}')
        response = self.downloader.get(task['url'])
        task['status_code'] = response.status_code
        if response.status_code != 200 or response.text in ['', None]:
            task['err_reason'] = response.reason
            logger.error(f'[数据挖掘]异常网址 - {task["url"]}')
            return

        task['domain'] = extract_domain(task['url'])
        page_source = response.text
        task['name'] = extract_page_title(page_source)
        task['base_url'] = extract_base_url(task['url'])

        items = self.parser.site_items(page_source, task['base_url'])
        lst = []
        _c = 0  # 页面包含的关键词计数器
        for item in items:
            name, url = item['name'], item['host']
            if self.validator.phrase(name):
                lst.append(self.make_task(
                    url=url,
                    name=name,
                    origin=task['origin'],
                    groups=task['groups'],
                    classify=self.visit_classify,
                    weight=task['weight']
                ))
                _c += 1

        if _c > 1:
            self.push_domain(task)
        else:
            if not self.validator.data(task['domain']):
                self.push_remove(task)
        self.scheduler.add_excavate(lst, level=task['weight'])

    def excavate(self):
        t_name = threading.currentThread().getName()
        logger.info(f'[数据挖掘]启动 - {t_name}')
        while True:
            tasks = self.scheduler.get_excavate_task()
            if len(tasks) == 0:
                self.loops_interval(self._interval)
                continue

            task_key, task = tasks
            if self.validator.data(task['url']):
                continue

            self.retrieve_site(task)
            '''url - 添加过滤器'''
            self.validator.add_data(task['url'])
            '''domain - 添加过滤器'''
            self.validator.add_data(task['domain'])
            '''访问记录'''
            self.push_records(task)

    def start(self):
        logger.info(f'[数据挖掘]初始化加载')
        with ThreadPoolExecutor(self._workers, 'DataExcavate') as executor:
            futures = []
            for _ in range(1, self._workers + 1):
                f = executor.submit(self.excavate)
                f.add_done_callback(err_details)
                futures.append(f)
            wait(futures)