#!/usr/bin/env python3
"""
(c) 2019 Claims Toolkit, 
Health Information Privacy Lab, Vanderbilt University Medical Center

Steve L. Nyemba <steve.l.nyemba@vanderbilt.edu>
Khanhly Nguyen <khanhly.t.nguyen@gmail.com>


This code is intended to process and parse healthcare x12 837 (claims) and x12 835 (remittances) into human readable JSON format.
The claims/outpout can be forwarded to a NoSQL Data store like couchdb and mongodb
Usage :
    Commandline :
        python edi-parser --scope --config <path> --folder <path> --store <[mongo|disk|couch]> --<db|path]> <id|path>

        with :
            --scope     <claims|remits>
            --config    path of the x12 to be parsed i.e it could be 835, or 837
            --folder    location of the files (they must be decompressed)
            --store     data store could be disk, mongodb, couchdb
            --db|path    name of the folder to store the output or the database name
    
    Embedded in Code   :

        import edi.parser
        import json

        file = '/data/claim_1.x12'
        conf = json.loads(open('config/837.json').read())
        edi.parser.get_content(filename,conf)
"""
from healthcareio.params import SYS_ARGS
from transport import factory
import requests
from healthcareio import analytics
from healthcareio import server


from healthcareio.parser import get_content
import os
import json
import sys
import numpy as np
from multiprocessing import Process
import time
from healthcareio import x12
import smart
from healthcareio.server import proxy
import pandas as pd

PATH = os.sep.join([os.environ['HOME'],'.healthcareio'])
OUTPUT_FOLDER = os.sep.join([os.environ['HOME'],'healthcare-io'])
INFO = None
URL = "https://healthcareio.the-phi.com"
if not os.path.exists(PATH) :
    os.mkdir(PATH)
import platform
import sqlite3 as lite
# PATH = os.sep.join([os.environ['HOME'],'.edi-parser'])
def signup (**args) :
    """
    :email  user's email address
    :url    url of the provider to signup
    """
    
    email = args['email']
    url = args['url'] if 'url' in args else URL
    folders = [PATH,OUTPUT_FOLDER]
    for path in folders :
        if not os.path.exists(path) :
            os.mkdir(path)
    
    #
    # 
    store = args['store'] if 'store' in args else 'sqlite'
    headers = {"email":email,"client":platform.node(),"store":store,"db":args['db']}
    http = requests.session()    
    r = http.post(url,headers=headers)
    
    #
    # store = {"type":"disk.DiskWriter","args":{"path":OUTPUT_FOLDER}}
    # if 'store' in args :
    #     store = args['store']
    filename =  (os.sep.join([PATH,'config.json']))
    info = r.json() #{"parser":r.json(),"store":store}
    info = dict({"owner":email},**info)
    info['store']['args']['path'] =os.sep.join([OUTPUT_FOLDER,'healthcare-io.db3']) #-- sql
    info['out-folder'] = OUTPUT_FOLDER

    file = open( filename,'w')
    file.write( json.dumps(info))
    file.close()

    #
    # Create the sqlite3 database to 


def log(**args):
    """
    This function will perform a log of anything provided to it
    """
    pass
def init():
    """
    read all the configuration from the 
    """
    filename    = os.sep.join([PATH,'config.json'])
    info        = None
    if os.path.exists(filename):
        file = open(filename)
        info = json.loads(file.read())
        if not os.path.exists(info['out-folder']) :
            os.mkdir(info['out-folder'])

        if info['store']['type'] == 'disk.SQLiteWriter'  and  not os.path.exists(info['store']['args']['path']) :
            conn = lite.connect(info['store']['args']['path'],isolation_level=None)
            for key in info['schema'] :
                _sql = info['schema'][key]['create']
                # r = conn.execute("select * from sqlite_master where name in ('claims','remits')")
                conn.execute(_sql)
            conn.commit()
            conn.close()

    return info
#
# Global variables that load the configuration files

def parse(**args):
    """
    This function will parse the content of a claim or remittance (x12 format) give the following parameters
    :filename   absolute path of the file to be parsed
    :type       claims|remits in x12 format
    """
    global INFO
    if not INFO :
        INFO = init()
    if args['type'] == 'claims' :
        CONFIG = INFO['parser']['837']
    elif args['type'] == 'remits' :
        CONFIG = INFO['parser']['835']
    else:
        CONFIG = None
    if CONFIG :
        # CONFIG = CONFIG[-1] if 'version' not in args and (args['version'] < len(CONFIG)) else CONFIG[0]
        CONFIG = CONFIG[int(args['version'])-1] if 'version' in SYS_ARGS and int(SYS_ARGS['version']) < len(CONFIG) else CONFIG[-1]
        SECTION = CONFIG['SECTION']
        os.environ['HEALTHCAREIO_SALT'] = INFO['owner']

        
        return get_content(args['filename'],CONFIG,SECTION)
def resume (files,id,config):
    _args = config['store'].copy()
    if 'mongo' in config['store']['type'] :
        _args['type'] = 'mongo.MongoReader'
        reader = factory.instance(**_args)
    _files = []
    if 'resume' in config['analytics'] :
        _args = config['analytics']['resume'][id]
        _files = reader.read(**_args)
        _files = [item['name'] for item in _files if item['name'] != None]
        return list(set(files) - set(_files))
        
    return files
    pass
def apply(files,store_info,logger_info=None):
    """
        :files          list of files to be processed in this given thread/process
        :store_info     information about data-store, for now disk isn't thread safe
        :logger_info    information about where to store the logs
    """

    if not logger_info :
        logger = factory.instance(type='disk.DiskWriter',args={'path':os.sep.join([info['out-folder'],SYS_ARGS['parse']+'.log'])})
    else:
        logger = factory.instance(**logger_info)

    writer = factory.instance(**store_info)
    for filename in files :
        
        if filename.strip() == '':
            continue
        # content,logs = get_content(filename,CONFIG,CONFIG['SECTION'])  
        # 
        try:              
            content,logs = parse(filename = filename,type=SYS_ARGS['parse'])
            
            if content :                        
                writer.write(content)
            if logs :
                [logger.write(dict(_row,**{"parse":SYS_ARGS['parse']})) for _row in logs]
            else:
                logger.write({"parse":SYS_ARGS['parse'],"name":filename,"completed":True,"rows":len(content)})
        except Exception as e:
            
            logger.write({"parse":SYS_ARGS['parse'],"filename":filename,"completed":False,"rows":-1,"msg":e.args[0]})
        # print ([filename,len(content)])
        #
        # @TODO: forward this data to the writer and log engine 
        #
def upgrade(**args):
    """
    :email  provide us with who you are
    :key    upgrade key provided by the server for a given email
    """    
    url = args['url'] if 'url' in args else URL+"/upgrade"
    headers = {"key":args['key'],"email":args["email"],"url":url}
def check(**_args):
    """
    This function will check if there is an update available (versions are in the configuration file)
    :param url
    """
    url = _args['url'][:-1] if _args['url'].endswith('/') else _args['url']
    url = url + "/version"
    if 'version' not in _args :
        version = {"_id":"version","current":0.0}
    else:
        version = _args['version']
    http = requests.session()    
    r = http.get(url)
    return r.json()
    
if __name__ == '__main__' :
    info = init()
    
    if 'out-folder' in SYS_ARGS :
        OUTPUT_FOLDER = SYS_ARGS['out-folder']
    SYS_ARGS['url'] = SYS_ARGS['url'] if 'url' in SYS_ARGS else URL
    
    if set(list(SYS_ARGS.keys())) & set(['signup','init']):
        #
        # This command will essentially get a new copy of the configurations
        # @TODO: Tie the request to a version ? 
        #
        
        email = SYS_ARGS['signup'].strip() if 'signup' in SYS_ARGS else SYS_ARGS['init']
        url = SYS_ARGS['url'] if 'url' in SYS_ARGS else URL
        store = SYS_ARGS['store'] if 'store' in SYS_ARGS else 'sqlite'
        db='healthcareio' if 'db' not in SYS_ARGS else SYS_ARGS['db']
        signup(email=email,url=url,store=store,db=db)
    # else:
    #     m = """
    #     usage:
    #         healthcareio --signup --email myemail@provider.com [--url <host>]
                    
    #     """
    #     print (m)
    elif 'upgrade' in SYS_ARGS :
        #
        # perform an upgrade i.e some code or new parsers information will be provided
        #

        pass
    elif 'parse' in SYS_ARGS and info:
        """
        In this section of the code we are expecting the user to provide :
        :folder location of the files to process or file to process
        :
        """     
        files = []
        if 'file' in SYS_ARGS :
            files = [SYS_ARGS['file']]  if not os.path.isdir(SYS_ARGS['file']) else []
        if 'folder' in SYS_ARGS and os.path.exists(SYS_ARGS['folder']):
            for root,_dir,f in os.walk(SYS_ARGS['folder']) :
                
                if f :
                    files += [os.sep.join([root,name]) for name in f]
            
            # names = os.listdir(SYS_ARGS['folder'])
            # files   += [os.sep.join([SYS_ARGS['folder'],name]) for name in names if not os.path.isdir(os.sep.join([SYS_ARGS['folder'],name]))]
        else:
            #
            # raise an error
            
            pass
        #
        # if the user has specified to resume, we should look into the logs and pull the files processed and those that haven't
        #
        if 'resume' in SYS_ARGS :
            store_config = json.loads( (open(os.sep.join([PATH,'config.json']))).read() )
            files = proxy.get.resume(files,store_config )
            # print (["Found ",len(files)," files unprocessed"])
        #
        # @TODO: Log this here so we know what is being processed or not
        SCOPE = None
        
        if files : #and ('claims' in SYS_ARGS['parse'] or 'remits' in SYS_ARGS['parse']):

            BATCH_COUNT = 1 if 'batch' not in SYS_ARGS else int (SYS_ARGS['batch'])
            
            files = np.array_split(files,BATCH_COUNT)
            procs = []
            index = 0
            for row in files :
                
                row = row.tolist()
                # logger.write({"process":index,"parse":SYS_ARGS['parse'],"file_count":len(row)})
                # proc = Process(target=apply,args=(row,info['store'],_info,))
                parser = x12.Parser(os.sep.join([PATH,'config.json']))
                parser.set.files(row)
                parser.start()
                procs.append(parser)
                # index = index + 1
            while len(procs) > 0 :
                procs = [proc for proc in procs if proc.is_alive()]
                time.sleep(2)

                

        pass
    elif 'analytics' in SYS_ARGS :
        PORT = int(SYS_ARGS['port']) if 'port' in SYS_ARGS else 5500
        DEBUG= int(SYS_ARGS['debug']) if 'debug' in SYS_ARGS else 0
        SYS_ARGS['context'] = SYS_ARGS['context'] if 'context' in SYS_ARGS else ''
        #
        # 
        
        # PATH= SYS_ARGS['config'] if 'config' in SYS_ARGS else os.sep.join([os.environ['HOME'],'.healthcareio','config.json'])
        
        if os.path.exists(os.sep.join([PATH,'config.json'])) :
            e = analytics.engine(os.sep.join([PATH,'config.json'])) #--@TODO: make the configuration file globally accessible
            e.apply(type='claims',serialize=True)
            SYS_ARGS['engine'] = e
            SYS_ARGS['config'] = json.loads(open(os.sep.join([PATH,'config.json'])).read())
        else:
            SYS_ARGS['config'] = {"owner":None,"store":None}

        if 'args' not in SYS_ARGS['config'] :
            SYS_ARGS['config']["args"] = {"batch":1,"resume":True,"folder":"/data"}
        
        me = pd.DataFrame(smart.top.read(name='healthcare-io.py')).args.unique().tolist()        
        SYS_ARGS['me'] = me[0] #-- This key will identify the current process

        pointer = lambda : server.app.run(host='0.0.0.0',port=PORT,debug=DEBUG,threaded=False)
        pthread = Process(target=pointer,args=())
        pthread.start()
    elif 'check-update' in SYS_ARGS :
        _args = {"url":SYS_ARGS['url']}
        try:
            if os.path.exists(os.sep.join([PATH,'config.json'])) :
                SYS_ARGS['config'] = json.loads((open(os.sep.join([PATH,'config.json']))).read())
            else:
                SYS_ARGS['config'] = {}
            if 'version' in SYS_ARGS['config'] :
                _args['version'] = SYS_ARGS['config']['version']
            version = check(**_args)
            _version = {"current":0.0}if 'version' not in SYS_ARGS['config'] else SYS_ARGS['config']['version']
            if _version['current'] != version['current'] :
                print ()
                print ("You need to upgrade your system to version to ",version['current'])
                print ("\t- signup (for new configuration)")
                print ("\t- use pip to upgrade the codebase")
            else:
                print ()
                print ("You are running the current configuraiton version ",_version.current)
        except Exception as e:
            print (e)
            pass
        
    elif 'export' in SYS_ARGS:
        #
        # this function is designed to export the data to csv
        #
        format = SYS_ARGS['format'] if 'format' in SYS_ARGS else 'csv'
        format = format.lower()
        if set([format]) not in ['xls','csv'] :
            format = 'csv'
        
    else:
        msg = """
        cli:
        
            healthcare-io.py    --<[signup|init]> <email> --store <sqlite|mongo> [--batch <value>]
            healthcare-io.py    --parse --folder <path> [--batch <value>] [--resume]
            healthcare-io.py    --check-update
        action :
            --signup|init   signup user and get configuration file
            --parse         starts parsing
            --check         checks for updates
        parameters :
            --<[signup|init]>   signup or get a configuration file from a parsing server
            --folder            location of the files (the program will recursively traverse it)
            --store             data store mongo or sqlite or mongodb
            --resume            will attempt to resume if there was an interruption
        """
        print(msg)
        pass
    # """
    # The program was called from the command line thus we are expecting 
    #     parse   in [claims,remits]
    #     config  os.sep.path.exists(path)
    #     folder    os.sep.path.exists(path)
    #     store   store ()
    # """
    # p = len( set(['store','config','folder']) & set(SYS_ARGS.keys())) == 3 and ('db' in SYS_ARGS or 'path' in SYS_ARGS)
    # TYPE = {
    #     'mongo':'mongo.MongoWriter',
    #     'couch':'couch.CouchWriter',
    #     'disk':'disk.DiskWriter'
    # }
    # INFO = {
    #     '837':{'scope':'claims','section':'HL'},
    #     '835':{'scope':'remits','section':'CLP'}
    # }
    # if p :
    #     args = {}
    #     scope = SYS_ARGS['config'][:-5].split(os.sep)[-1]
    #     CONTEXT = INFO[scope]['scope']
    #     #
    #     # @NOTE:
    #     # improve how database and data stores are handled.
    #     if SYS_ARGS['store'] == 'couch' :
    #         args = {'url': SYS_ARGS['url'] if 'url' in SYS_ARGS else 'http://localhost:5984'}
    #         args['dbname'] = SYS_ARGS['db']
            
    #     elif SYS_ARGS ['store'] == 'mongo':
    #         args = {'host':SYS_ARGS['host']if 'host' in SYS_ARGS else 'localhost:27017'}
    #     if SYS_ARGS['store'] in ['mongo','couch']:
    #         args['dbname'] = SYS_ARGS['db'] if 'db' in SYS_ARGS else 'claims_outcomes'
    #         args['doc'] = CONTEXT

    #     TYPE    = TYPE[SYS_ARGS['store']] 
    #     writer  = factory.instance(type=TYPE,args=args)
    #     if SYS_ARGS['store'] == 'disk':
    #         writer.init(path = 'output-claims.json')
    #     logger  = factory.instance(type=TYPE,args= dict(args,**{"doc":"logs"}))
    #     files   = os.listdir(SYS_ARGS['folder'])
    #     CONFIG  = json.loads(open(SYS_ARGS['config']).read())
    #     SECTION = INFO[scope]['section']
        
    #     for file in files :
    #         if 'limit' in SYS_ARGS and files.index(file) == int(SYS_ARGS['limit']) :
    #             break
    #         else:
    #             filename = os.sep.join([SYS_ARGS['folder'],file])
                
    #             try:
    #                 content,logs = get_content(filename,CONFIG,SECTION)
    #             except Exception as e:
    #                 if sys.version_info[0] > 2 :
    #                     logs = [{"filename":filename,"msg":e.args[0]}]
    #                 else:
    #                     logs = [{"filename":filename,"msg":e.message}]
    #                 content = None
    #             if content :
                    
    #                 writer.write(content)
    #             if logs:
                    
    #                 logger.write(logs)
            
                
    #     pass
    # else:
    #     print (__doc__)