#!/usr/bin/env python
# -*-coding:UTF-8 -*

"""
The ZMQ_Sub_Indexer Module
============================

The ZMQ_Sub_Indexer modules is fetching the list of files to be processed
and index each file with a full-text indexer (Whoosh until now).

"""
import time
from packages import Paste
from pubsublogger import publisher

from whoosh.index import create_in, exists_in, open_dir
from whoosh.fields import Schema, TEXT, ID
import os
from os.path import join, getsize

from Helper import Process

# Config variable
INDEX_SIZE_THRESHOLD = 500 #Mb
TIME_WAIT = 1.0 #sec

# return in bytes
def check_index_size(indexnum):
    global baseindexpath
    the_index_name = "index_"+str(indexnum) if indexnum != 0 else "old_index"
    the_index_name = os.path.join(baseindexpath, the_index_name)
    cur_sum = 0
    for root, dirs, files in os.walk(the_index_name):
        cur_sum += sum(getsize(join(root, name)) for name in files)
    return cur_sum


if __name__ == "__main__":
    publisher.port = 6380
    publisher.channel = "Script"

    config_section = 'Indexer'

    p = Process(config_section)

    # Indexer configuration - index dir and schema setup
    baseindexpath = os.path.join(os.environ['AIL_HOME'],
                             p.config.get("Indexer", "path"))
    indexRegister_path = os.path.join(os.environ['AIL_HOME'], 
                             p.config.get("Indexer", "register"))
    indexertype = p.config.get("Indexer", "type")
    if indexertype == "whoosh":
        schema = Schema(title=TEXT(stored=True), path=ID(stored=True,
                                                         unique=True),
                        content=TEXT)
        if not os.path.exists(baseindexpath):
            os.mkdir(baseindexpath)

        # create the index register if not present
        if not os.path.isfile(indexRegister_path):
            with open(indexRegister_path, 'w') as f:
                f.write("1")

        with open(indexRegister_path, "r") as f:
            allIndex = f.read()
            allIndex = allIndex.split(',')
            allIndex.sort()
            indexnum = int(allIndex[-1])

            indexpath = os.path.join(baseindexpath, "index_"+str(indexnum))
            if not exists_in(indexpath):
                ix = create_in(indexpath, schema)
            else:
                ix = open_dir(indexpath)
 
        last_refresh = time.time()

    # LOGGING #
    publisher.info("ZMQ Indexer is Running")

    while True:
        try:
            message = p.get_from_set()

            if message is not None:
                PST = Paste.Paste(message)
            else:
                publisher.debug("Script Indexer is idling 1s")
                time.sleep(1)
                continue
            docpath = message.split(" ", -1)[-1]
            paste = PST.get_p_content()
            print "Indexing :", docpath


            if time.time() - last_refresh > TIME_WAIT: #avoid calculating the index's size at each message
                last_refresh = time.time()
                if check_index_size(indexnum) > INDEX_SIZE_THRESHOLD*(1000*1000):
                    indexpath = os.path.join(baseindexpath, "index_"+str(indexnum+1))
                    ix = create_in(indexpath, schema, indexname=str(indexnum+1))
                    ## Correctly handle the file
                    with open(indexRegister_path, "a") as f:
                        f.write(","+str(indexnum))


            if indexertype == "whoosh":
                indexwriter = ix.writer()
                indexwriter.update_document(
                    title=unicode(docpath, errors='ignore'),
                    path=unicode(docpath, errors='ignore'),
                    content=unicode(paste, errors='ignore'))
                indexwriter.commit()
        except IOError:
            print "CRC Checksum Failed on :", PST.p_path
            publisher.error('Duplicate;{};{};{};CRC Checksum Failed'.format(
                PST.p_source, PST.p_date, PST.p_name))