#!/usr/bin/env python
# -*- coding:utf-8 -*-
import json
from threading import Lock
import logging
import datetime
from os import path
import time
import shutil


class Handle:
    def __init__(self, max_length, temp_file, official_dir, interval=5 * 60):
        """
        :param max_length: Every 1000 rows of data are deposited in an official file.
        :param temp_file: Temporary file path.
        :param official_dir: Official folder Path.
        :param interval: Put temporary files into official files to upload at regular intervals.
        """
        self.lock = Lock()

        # Data results collected by multiple plug-ins need to be queued to write to files.
        # The Q is the queue.
        self.Q = []
        self.max_item_length = max_length
        self.temp_file = temp_file
        self.official_dir = official_dir
        self.interval = interval
        self.current_row = 0

    def add_task(self, content):
        if not isinstance(content, dict):
            logging.warning('[HANDLE] add task content: %s but type is not dict', content)
            return

        self.lock.acquire()
        content = self.content_format(content)
        self.Q.append(content)
        self.lock.release()

    @staticmethod
    def content_format(content):
        if not content.__contains__('dev_ip'):
            content['dev_ip'] = ''
        if not content.__contains__('expr'):
            content['expr'] = 1
        if not content.__contains__('dev_id'):
            content['dev_id'] = ''
        if not content.__contains__('port'):
            content['port'] = ''
        if not content.__contains__('type'):
            content['type'] = ''
        if not content.__contains__('schema'):
            content['schema'] = ''
        if not content.__contains__('login_name'):
            content['login_name'] = ''
        if not content.__contains__('pwd'):
            content['pwd'] = ''
        if not content.__contains__('kpi'):
            content['kpi'] = {}
        return content

    def to_file(self, name):
        try:
            shutil.copy(self.temp_file, name)
        except Exception as e:
            return e
        return None

    def listen(self):
        temp_file_mode = 'a+'
        temp_file_ptr = self.create_temp_file(temp_file_mode)
        beg = int(datetime.datetime.now().timestamp())
        end = beg
        while True:
            self.sleep()
            end = int(datetime.datetime.now().timestamp())
            self.lock.acquire()
            q = self.Q
            self.lock.release()
            if len(q) < 1:
                continue

            # Open temp file ptr. It might get None again, so execute continue one more time.
            if temp_file_ptr is None or temp_file_ptr.closed:
                temp_file_ptr = self.create_temp_file(temp_file_mode)
                continue

            for item in q:
                item_value = ''
                try:
                    item_value = json.dumps(item)
                    temp_file_ptr.write(item_value)
                    self.current_row += 1
                except Exception as e:
                    logging.error("[HANDLE] write item(%s) error :%s", item_value, e)

            logging.debug('[HANDLE] listen and ')

            # If the currently recorded data line is greater than or equal to the largest data line,
            # the temporary file is written to the official file.
            # If the file has not been saved for more than three minutes, and the temporary file is
            # not empty, an official file is also saved.
            official_file = ''
            if self.current_row >= self.max_item_length or (end - beg >= 3 * 60 and self.current_row > 0):
                try:
                    now = int(datetime.datetime.now().timestamp() * 1000)
                    official_file = path.join(self.official_dir, str(now) + '.tok')
                    msg = self.to_file(official_file)
                    if msg is not None:
                        logging.error('[HANDLE] to official file(%s) error: %s', official_file, msg)
                        temp_file_mode = 'a+'
                        continue

                    temp_file_ptr.close()
                    temp_file_mode = 'w+'
                    self.current_row = 0

                    beg = int(datetime.datetime.now().timestamp())
                except Exception as e:
                    logging.error('[HANDLE] copy temp file(%s) to official file(%s) error: %s',
                                  self.temp_file, official_file, e)

    def create_temp_file(self, mode):
        try:
            f = open(self.temp_file, mode=mode)
            return f
        except Exception as e:
            logging.error('[HANDLE] create temp file(%s) error: %s', self.temp_file, e)
            return None

    @staticmethod
    def sleep():
        time.sleep(1)


class Uploader:
    def __init__(self):
        pass