#!/usr/bin/env python3
"""
Consume a 846 file from 3PLs, and translate into a 
inventory comparison report
For Shadex we also need to reply with a 997

"""
import datetime
import pathlib
import re
import shutil
import typing
import smtplib
import pprint

from email.mime.multipart import MIMEMultipart
from email.mime.application import MIMEApplication
from email.mime.text import MIMEText

import records  # type: ignore

import yamamotoyama  # type: ignore
import yamamotoyama.x3_imports  # type: ignore

THIS_DIRECTORY = pathlib.Path(__file__).parent
X12_DIRECTORY = THIS_DIRECTORY / "incoming"
IMPORTS_DIRECTORY = THIS_DIRECTORY / "x3_imports"
EDI_997_DIRECTORY = THIS_DIRECTORY / "997_processing"
EDI_846_ATTACHMENTS = THIS_DIRECTORY / "846_reports"
EDI_846_ATTACHMENTS_ARCHIVE = EDI_846_ATTACHMENTS / "archive"

SHANDEX_846_FILENAME_RE = re.compile(
    r"\A 846_STASH-YAMAMOTOYAMA_ \S+ [.]edi \Z", re.X | re.M | re.S
)

SHANDEX_STATUS = {
    '33' : 'A',
    '20' : 'R',
    'QH' : 'Q'
}


def main():
    """
    Do it!
    """
    #read in the information from Shandex and store it
    for edi_filename in X12_DIRECTORY.iterdir():
        if SHANDEX_846_FILENAME_RE.match(edi_filename.name):
            pprint.pprint(edi_filename.name)
            shandex_inventory=process_file(edi_filename)
            # file moved to 997 processing folder to be sent later
            shutil.move(edi_filename, EDI_997_DIRECTORY / edi_filename.name)
            #get stock information about WON and store it
            #pass date from EDI so we can subtract newer stock movements?
            x3_won_inventory=get_x3_won_inventory()
            #write out an excel file with the stock from Shandex with X3 next to it, then include anything missing
            compare_inventory(shandex_inventory, x3_won_inventory)
            stock_count_alert()


def compare_inventory(shandex_inventory, x3_inventory):
    today = datetime.datetime.today()
    today = today.strftime('%Y-%m-%d')
    with open(EDI_846_ATTACHMENTS / f'inventory_comparison_{today}.csv', 'w', newline='') as outfile:
        outfile.write(','.join(['Site','Item','Description','Lot','X3 qty','Shandex qty']))#header
        outfile.write('\n')
        for record in x3_inventory:
            site = record["STOFCY_0"]
            item = record["ITMREF_0"]
            des = record["ITMDES1_0"]
            lot = record["LOT_0"]
            qty = str(record["QTY"])
            outfile.write(','.join([site, item, des, lot, qty]))
            outfile.write(',')
            if item in shandex_inventory:
                if lot in shandex_inventory[item]:
                    outfile.write(str(shandex_inventory[item][lot]))
                    # pprint.pprint(shandex_inventory[item])
                    del shandex_inventory[item][lot]
                    # pprint.pprint(shandex_inventory[item])
                    if len(shandex_inventory[item]) == 0:
                        # pprint.pprint('entire del')
                        # pprint.pprint(shandex_inventory[item])
                        del shandex_inventory[item]
                        # pprint.pprint(shandex_inventory[item])
                else:
                    outfile.write('0')#lot not found
            else:
                outfile.write('0')#item not found
            outfile.write('\n')
        #write the rest of shandex inventory
        if len(shandex_inventory) > 0:
            outfile.write('Shandex only')
            outfile.write('\n')
            for item in shandex_inventory:
                # pprint.pprint(item)
                for lot in shandex_inventory[item]:
                    # pprint.pprint(lot)
                    qty = str(shandex_inventory[item][lot])
                    outfile.write(','.join([item, lot, qty]))
                    outfile.write('\n')


def tokens_from_edi_file(
    edi_filename: pathlib.Path,
) -> typing.Iterator[typing.List[str]]:
    """
    Read tokens from EDI file
    """
    with edi_filename.open(encoding="utf-8", newline="") as edi_file:
        for record in edi_file.read().split("~"):
            fields = record.split("*")
            if fields[0] in {
                "ISA",
                "GS"
                "ST",
                "RED",
                "GE",
                "IEA"
            }:
                continue
            yield fields


def get_x3_won_inventory():
    #TODO correct the dates used in stock_issues?
    with yamamotoyama.get_connection() as db_connection:
        return db_connection.query(
            """
            with stock_issues as (
                select 
                    STJ.STOFCY_0,
                    STJ.ITMREF_0,
                    STJ.LOT_0,
                    sum(STJ.QTYSTU_0) [QTYSTU_0]
                from PROD.STOJOU STJ
                where
                    STJ.STOFCY_0 = 'WON'
                    and STJ.IPTDAT_0 between getdate()-1 and getdate()
                group by
                    STJ.STOFCY_0,
                    STJ.ITMREF_0,
                    STJ.LOT_0
                )
                select
                    SLF.STOFCY_0,
                    SLF.ITMREF_0,
                    ITM.ITMDES1_0,
                    SLF.LOT_0,
                    cast(sum(SLF.AAACUMQTY_0 + SLF.QQQCUMQTY_0 + SLF.RRRCUMQTY_0 - coalesce(stock_issues.QTYSTU_0,0)) as integer) as QTY,
                    SLF.AVC_0
                from PROD.STOLOTFCY SLF
                join PROD.ITMMASTER ITM on
                    SLF.ITMREF_0 = ITM.ITMREF_0
                left join stock_issues
                    on SLF.ITMREF_0 = stock_issues.ITMREF_0
                    and SLF.STOFCY_0 = stock_issues.STOFCY_0
                    and SLF.LOT_0 = stock_issues.LOT_0
                where
                    SLF.STOFCY_0 = 'WON'
                group by
                    SLF.STOFCY_0,
                    SLF.ITMREF_0,
                    ITM.ITMDES1_0,
                    SLF.LOT_0,
                    SLF.AVC_0
                order by 1, 2
            """,
            #startdate=edi_date,
        ).all()

def gtin_lookup(gtin):
    with yamamotoyama.get_connection() as db_connection:
        itmref = db_connection.query(
            """
            select
                [ITM].[ITMREF_0],
                [ITM].[ITMDES1_0],
                [ITM].[EANCOD_0],
                [ITM].[ZCASEUPC_0]
            from [PROD].[ITMMASTER] [ITM]
            join [PROD].[ITMFACILIT] [ITF]
                on [ITM].[ITMREF_0] = [ITF].[ITMREF_0]
                and [ITF].[STOFCY_0] = 'WON'
            where 
                replace([ITM].[ZCASEUPC_0],' ','') = :zcaseupc
            """,
            zcaseupc=gtin,
        ).first()
        if itmref is None:
            itmref = db_connection.query(
            """
            select
                [ITM].[ITMREF_0],
                [ITM].[ITMDES1_0],
                [ITM].[EANCOD_0],
                [ITM].[ZCASEUPC_0]
            from [PROD].[ITMMASTER] [ITM]
            join [PROD].[ITMFACILIT] [ITF]
                on [ITM].[ITMREF_0] = [ITF].[ITMREF_0]
                and [ITF].[STOFCY_0] = 'WON'
            where 
                replace([ITM].[EANCOD_0],' ','') = :zcaseupc
            """,
            zcaseupc=gtin,
        ).first()["ITMREF_0"]
        else:
            itmref = itmref["ITMREF_0"]
        return itmref


def stock_count_alert():
    msg = MIMEMultipart()
    msg['Subject'] = 'New Stock Count from Shandex'
    msg['Precedence'] = 'bulk'
    msg['From'] = 'x3report@stashtea.com'
    msg['To'] = 'isenn@yamamotoyama.com,vgomez@yamamotoyama.com'
    msg['Cc'] = 'bleeson@stashtea.com'
    emailtext = f'Attached.'
    msg.attach(MIMEText(emailtext, 'plain'))
    for file in EDI_846_ATTACHMENTS.iterdir():
        if file.name.endswith('.csv'):
            part = MIMEApplication(open(file, 'rb').read())
            part['Content-Disposition'] = f'attachment; filename="{file.name}"'
            msg.attach(part)
            shutil.move(file, EDI_846_ATTACHMENTS_ARCHIVE / file.name)
    with smtplib.SMTP_SSL("smtp.gmail.com", 465) as smtp:
        smtp.login(user='x3reportmk2@yamamotoyama.com', password=r'n</W<7fr"VD~\2&[pZc5')
        smtp.send_message(msg)


def process_file(edi_filename: pathlib.Path):
    """
    Convert a specific EDI file into an import file.
    """
    shandex_inventory = {} #all inventory
    product = ''
    lot = ''
    qty = 0
    for fields in tokens_from_edi_file(edi_filename):
        if fields[0] == "BIA":
            advice_date = fields[4]
        if fields[0] == 'LIN' and len(fields) > 5:
            if product != '': #check loop entry
                if product not in shandex_inventory: #if we haven't seen the product yet add it
                    # pprint.pprint('product was not found')
                    shandex_inventory[product] = {lot : qty}
                    # pprint.pprint(shandex_inventory)
                else: #we've seen this product, have we seen the lot
                    if lot not in shandex_inventory[product]:#if not, add it
                        shandex_inventory[product][lot] = qty
                    else:
                        shandex_inventory[product][lot] += qty #if we have add to it
            # pprint.pprint('product: ' + product)
            # pprint.pprint('lot: ' + lot)
            # pprint.pprint('qty: ' + str(qty))
            #LIN**SK*077652972160*LT*31052026A
            gtin = fields[3]
            lot = fields[5]
            product = gtin_lookup(gtin)
            qty = 0
        if fields[0] == "QTY":#product should already exist
            # QTY*33*0
            # QTY*20*16
            # QTY*QH*0
            qty += int(fields[2])
        if fields[0] == "SE":#end of file
            # pprint.pprint('final add')
            # pprint.pprint(shandex_inventory)
            # pprint.pprint('product: ' + product)
            # pprint.pprint('lot: ' + lot)
            # pprint.pprint('qty: ' + str(qty))
            if product is not None: #check loop entry
                if product not in shandex_inventory: #if we haven't seen the product yet add it
                    shandex_inventory[product] = {lot : qty}
                else: #we've seen this product, have we seen the lot
                    if lot not in shandex_inventory[product]:#if not, add it
                        shandex_inventory[product][lot] = qty
                    else:
                        shandex_inventory[product][lot] += qty #if we have add to it
    return shandex_inventory


if __name__ == "__main__":
    main()