# coding=utf-8
'''
Created on 2016年3月7日
使用线程的方式为详情页生成下载任务
@author: ChenHao
'''
from pymongo.mongo_client import MongoClient
from util_common import Constant, html_parser
from bs4 import BeautifulSoup
import random
import threading
from pymongo.errors import ConnectionFailure

class InitDetail():
    def __init__(self, maxThread=200):
        self.maxThread = maxThread
        self.parser = html_parser.HtmlParser()
        # 连接数据库
        self.cli = MongoClient(Constant.MONGODB_URL)
        self.db = self.cli.spider
        
        self.startThread = 0
        self.finishThread = 0
        self.successed = 0
        self.failed = 0
        self.details = 0
        
    def hasNext(self):
        try:
            return self.db.kindlist_todo.find({"status": Constant.DONE , "creatDetailTask": Constant.TODO}).count() > 0
        except:
            return True
        
    def _get_task(self, size=1):
        return self.db.kindlist_todo.find({"status": Constant.DONE , "creatDetailTask": Constant.TODO}).limit(size)
    
    def _on_success(self, url, kinds, details):
        self.finishThread += 1
        self.details += len(details)
        self.successed += 1
        print('success', url)
    
    def _on_error(self, url, e):
        self.finishThread += 1
        self.failed += 1
        print('failure', url, e)
    
    def run(self):
        tasks = self._get_task(self.maxThread)
        for task in tasks:
            thread = InitThread(self.db, self.parser, task['url'], task['str_html'], self._on_success, self._on_error)
            thread.start()
        
    def stat(self):
        return self.successed, self.failed
    
    def close(self):
        self.cli.close()

class InitThread(threading.Thread):
    def __init__(self, db, parser, url, html, success, error):
        threading.Thread.__init__(self)
        self.db = db
        self.parser = parser
        self.url = url
        self.html = html
        self.success = success
        self.error = error
    
    def _parse_kind(self, soup):
        # 解析并存储解析出来的类目
        kindls = self.parser._get_kindlist_by_listPage(soup)
        kindls_list = list()
        for kind in kindls:
            kind_d = dict()
            kind_d["kindls"] = kind
            kindls_list.append(kind_d)
        return kindls_list
    
    def _parse_detail(self, soup):
        # 解析并存储detailTask
        detail_urls = self.parser._get_detail_urls_from_listPage(soup)
        # 组装detail任务
        task_list = list()
        for detail_url in detail_urls:
            d = dict()
            d["url"] = detail_url
            d["random"] = random.random()
            d["status"] = Constant.TODO
            d["analysisTask"] = Constant.TODO
            task_list.append(d)
        return task_list    
    
    def _on_success(self, kinds, details):
        # 类目
        self.db.kind_from_listpage.insert_many(kinds)
        # 详情
        self.db.detail_todo.insert_many(details)
        # 将此listPage修改状态
        self.db.kindlist_todo.update_one({'url': self.url}, {'$set': {'creatDetailTask': Constant.DONE}})
    
    def _on_error(self, e):
        self.db.kindlist_todo.update_one({'url': self.url}, {'$set': {'creatDetailTask': Constant.ERROR}})
      
    def run(self):
        if len(self.html) < 150000 or str(self.html).find('购买所选商品') == -1:
            e = Exception("无效HTML")
            self._on_error(e)
            if self.error is not None:
                self.error(self.url, e)
            return
        try:
            soup = BeautifulSoup(self.html, 'html.parser', from_encoding='utf-8')
            kinds = self._parse_kind(soup)
            details = self._parse_detail(soup)
            self._on_success(kinds, details)
            if self.success is not None:
                self.success(self.url, kinds, details)
        except ConnectionFailure as e:
            if self.error is not None:
                self.error(self.url, e)
        except Exception as e:
            self._on_error(e)
            if self.error is not None:
                self.error(self.url, e)
                
        
if __name__ == '__main__':
    task = InitDetail(maxThread=100)
    while task.hasNext():
        task.run()
    
    task.close()