#!/usr/bin/env python3
"""
Consume a 846 file from 3PLs, and translate into a 
inventory comparison report that could be used as a stock count?
For Shadex we also need to reply with a 997
947 is warehouse advice, to alert us of damages or amount changes from something
like a count
"""
#what about serial numbers?
#status on L line?
#remove negative line, needs to look up stocou? not sure.
# pylint: disable=too-many-instance-attributes
import dataclasses
import datetime
import decimal
import functools
import pathlib
import re
import shutil
import typing
import smtplib
import pprint

from email.mime.multipart import MIMEMultipart
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"

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

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


def main():
    """
    Do it!
    """
    for edi_filename in X12_DIRECTORY.iterdir():
        if SHANDEX_846_FILENAME_RE.match(edi_filename.name):
            process_file(edi_filename)
            # file moved to 997 processing folder to be sent later
            shutil.move(edi_filename, EDI_997_DIRECTORY / edi_filename.name)


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"
                "N1",
                "N9",
                "SE",
                "GE",
                "IEA"
            }:
                continue
            yield fields


def gtin_lookup(gtin):
        with yamamotoyama.get_connection('test') as db_connection:#todo remove 'test'
            return db_connection.query(
                """
                select
                    [ITM].[ITMREF_0],
                    [ITM].[ITMDES1_0],
                    [ITM].[EANCOD_0],
                    [ITM].[ZCASEUPC_0]
                from [FY23TEST].[ITMMASTER] [ITM]--TODO change back to [PROD]
                join [FY23TEST].[ITMFACILIT] [ITF]
                    on [ITM].[ITMREF_0] = [ITF].[ITMREF_0]
                    and [ITF].[STOFCY_0] = 'WON'
                where 
                    [ITM].[ZCASEUPC_0] = :zcaseupc
                """,
                zcaseupc=gtin,
            ).first()["ITMREF_0"]


def stock_movement_alert(itmref, qty, lot, status):
    msg = MIMEMultipart()
    msg['Subject'] = 'New Stock Change from Shandex'
    msg['Precedence'] = 'bulk'
    msg['From'] = 'x3report@stashtea.com'
    msg['To'] = 'bleeson@stashtea.com'#TODO correct receipientscares
    emailtext = f'Item: {itmref}\nQty: {qty}\nLot: {lot}\nStatus: {DAMAGE_CODE_MAPPING[status]}\nReason: {DAMAGE_CODE_DESCRIPTIONS_MAPPING[status]}'
    msg.attach(MIMEText(emailtext, 'plain'))
    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.
    """
    warehouse_stockchange = StockChange()
    vcrlin = 0
    for fields in tokens_from_edi_file(edi_filename):
        if fields[0] == "G62":
            iptdat = fields[2]
            warehouse_stockchange.header.iptdat = datetime.datetime.strptime(
                iptdat, "%Y%m%d"
            ).date()
        if fields[0] == 'W15':
            transaction_number = fields[2]
        if fields[0] == "W19":
            vcrlin += 1000
            # W19*AV*35*CA**UK*10077652082651***03022026C
            _, status, qty, uom, _, _, gtin, _, _, lot = fields[:10]
            product = gtin_lookup(gtin)
            stock_movement_alert(product, qty, lot, status)
            if status in EMAIL_ONLY_CODES:
                return
            warehouse_stockchange.header.vcrdes = DAMAGE_CODE_DESCRIPTIONS_MAPPING[status]
            subdetail = StockChangeSubDetail(
                qtypcu=int(qty),
                qtystu=int(qty),
                sta=DAMAGE_CODE_MAPPING[status],
                pcu=uom
            )
            detail_line = StockChangeDetail(
                    vcrlin=vcrlin,
                    itmref=product,
                    pcu=uom,
                    sta=DAMAGE_CODE_SOURCE_MAPPING[status],
                    lot=lot
                )
            warehouse_stockchange.append(
                detail_line,
                subdetail,
            )
    time_stamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")

    with yamamotoyama.x3_imports.open_import_file(
        IMPORTS_DIRECTORY / f"ZSCS_{transaction_number}_{time_stamp}.dat"
    ) as import_file:
        warehouse_stockchange.output(import_file)


@dataclasses.dataclass
class StockChangeSubDetail:
    """
    Information that goes onto a stockchange sub-detail line, taken from ZPTHI template.
    """

    pcu: str = ""
    qtypcu: int = 0
    qtystu: int = 0
    loc: str = ""
    sta: str = "A"
    
    # def stojous(self, shipment, item) -> typing.List[str]:
        # """
        # Convert grouped lot quantities into individual STOJOU records to fit on stockchange
        # """
        # with yamamotoyama.get_connection('test') as database: #todo remove 'test'
            # details = (
                # database.query(
                    # """
                # select
                    # 'S',
                    # 'A',
                    # [STJ].[PCU_0],
                    # cast(cast(-1*[STJ].[QTYSTU_0] as int) as nvarchar),
                    # [STJ].[LOT_0],
                    # '',
                    # '' 
                # from [FY23TEST].[STOJOU] [STJ] --TODO change to PROD
                # where 
                    # [STJ].[VCRNUM_0] = :sdhnum
                    # and [STJ].[ITMREF_0] = :itmref
                    # and [STJ].[LOT_0] = :lot
                    # and [STJ].[TRSTYP_0] = 4
                # """,
                    # sdhnum=shipment,
                    # itmref=item,
                    # lot=self.lot,
                # )
                # .all()
            # )
        # return details
        
    
    def convert_to_strings(self) -> typing.List[str]:
        """
        Convert to strings for X3 import writing.
        """
        def fix_uom(uom):
            x3_uom = ''
            if uom == 'CA':
                x3_uom = 'CS'
            else:
                x3_uom = uom
            return x3_uom

        return yamamotoyama.x3_imports.convert_to_strings(
            [
                "S",
                fix_uom(self.pcu),
                self.qtypcu,
                self.qtystu,
                self.loc,
                self.sta,
            ]
        )


@dataclasses.dataclass
class StockChangeDetail:
    """
    Information that goes on a stockchange detail line, taken from ZPTHI template.
    """
    
    vcrlin: int = 0
    itmref: str = ""
    pcu: str = ""
    pcustucoe: int = 1 #does this need a lookup?
    sta: str = "A" #todo this needs to flip based on the transaction A > R, A > Q, what about Q > A?
    loctyp: str = ""
    loc: str = ""
    lot: str = ""
    slo: str = ""
    sernum: str = ""
    palnum: str = ""
    ctrnum: str = ""
    qlyctldem: str= ""
    owner: str = "WON"
    subdetails: typing.List[StockChangeSubDetail] = dataclasses.field(
        default_factory=list
    )
    
    def palnum_lookup(self, itmref, lot, status):
        """
        Pick a palnum from X3 using the lot, location, and status
        It matters which one we use, best attempt is to get the largest one available
        """
        with yamamotoyama.get_connection('test') as db_connection:#todo remove 'test'
            return db_connection.query(
                """
                select top 1
                    [STO].[STOFCY_0],
                    [STO].[ITMREF_0],
                    [STO].[LOT_0],
                    [STO].[PALNUM_0],
                    [STO].[QTYSTU_0]
                from [FY23TEST].[STOCK] [STO] --TODO change to PROD
                where 
                    [STO].[ITMREF_0] = :itmref
                    and [STO].[STOFCY_0] = 'WON'
                    and [STO].[LOT_0] = :lot
                    and [STO].[STA_0] = :status
                order by 
                    [STO].[QTYSTU_0] desc
                """,
                itmref=itmref,
                lot=lot,
                status=status
            ).first()["PALNUM_0"]
    
    def gtin_lookup(self, gtin):
        with yamamotoyama.get_connection('test') as db_connection:#todo remove 'test'
            return db_connection.query(
                """
                select
                    [ITM].[ITMREF_0],
                    [ITM].[ITMDES1_0],
                    [ITM].[EANCOD_0],
                    [ITM].[ZCASEUPC_0]
                from [FY23TEST].[ITMMASTER] [ITM]--TODO change back to [PROD]
                join [FY23TEST].[ITMFACILIT] [ITF]
                    on [ITM].[ITMREF_0] = [ITF].[ITMREF_0]
                    and [ITF].[STOFCY_0] = 'WON'
                where 
                    [ITM].[ZCASEUPC_0] = :zcaseupc
                """,
                zcaseupc=gtin,
            ).first()["ITMREF_0"]
    
    def append(self, subdetail: StockChangeSubDetail):
        """
        Add subdetail
        """
        subdetail.pcu = self.pcu
        self.subdetails.append(subdetail)

    def check_subdetail_qty(self):
        """
        Check for shortages by totaling up subdetail quantities.
        """
        total_cases = 0
        for subdetail in self.subdetails:
            total_cases -= subdetail.qtypcu
        return abs(total_cases)

    def convert_to_strings(self) -> typing.List[str]:
        """
        Convert to strings for X3 import writing.
        """
        def fix_uom(uom):
            x3_uom = ''
            if uom == 'CA':
                x3_uom = 'CS'
            else:
                x3_uom = uom
            return x3_uom
            
        self.qty = self.check_subdetail_qty()
        return yamamotoyama.x3_imports.convert_to_strings(
            [
                "L",
                self.vcrlin,
                self.itmref,
                fix_uom(self.pcu),
                self.pcustucoe,
                self.sta,
                self.loctyp,
                self.loc,
                self.lot,
                self.slo,
                self.sernum,
                self.palnum_lookup(self.itmref, self.lot, self.sta),
                self.ctrnum,
                self.qlyctldem,
                self.owner
            ]
        )

    def __eq__(self, item: typing.Any) -> bool:
        """
        Test for equality
        """
        if isinstance(item, str):
            return self.itmref == item
        if isinstance(item, StockChangeDetail):
            return self.itmref == item.itmref
        return False

    # def fill(self):#not needed for stockchanges
        # """
        # Set soplin & itmdes from itmref & sohnum
        # """

        # def get() -> records.Record:
            # with yamamotoyama.get_connection() as database:
                # how_many = (
                    # database.query(
                        # """
                    # select
                        # count(*) as [how_many]
                    # from [PROD].[SORDERP] as [SOP]
                    # where
                        # [SOP].[SOHNUM_0] = :sohnum
                        # and [SOP].[ITMREF_0] = :itmref
                    # """,
                        # sohnum=self.sohnum,
                        # itmref=self.itmref,
                    # )
                    # .first()
                    # .how_many
                # )
                # if how_many == 1:
                    # return database.query(
                        # """
                        # select top 1
                            # [SOP].[SOPLIN_0]
                            # ,[SOP].[ITMDES1_0]
                            # ,[SOP].[SAU_0]
                        # from [PROD].[SORDERP] as [SOP]
                        # where
                            # [SOP].[SOHNUM_0] = :sohnum
                            # and [SOP].[ITMREF_0] = :itmref
                        # order by
                            # [SOP].[SOPLIN_0]
                        # """,
                        # sohnum=self.sohnum,
                        # itmref=self.itmref,
                    # ).first()
                

        # result = get()
        # self.soplin = result.SOPLIN_0
        # self.itmdes = result.ITMDES1_0
        # self.sau = result.SAU_0


@dataclasses.dataclass
class StockChangeHeader:
    """
    Information that goes on a stockchange header, taken from ZSCS template.
    """
    vcrnum: str = ""
    stofcy: str = "WON"
    iptdat: datetime.date = datetime.date(1753, 1, 1)
    vcrdes: str = ""
    pjt: str = ""
    trsfam: str = "CHX"
    
    
    def convert_to_strings(self) -> typing.List[str]:
        """
        Convert to X3 import line
        """
        return yamamotoyama.x3_imports.convert_to_strings(
            [
                "E",
                self.vcrnum,
                self.stofcy,
                self.iptdat.strftime("%Y%m%d"),
                self.vcrdes,
                self.pjt,
                self.trsfam,
            ]
        )


class StockChangeDetailList:
    """
    List of stockchange details
    """

    _details: typing.List[StockChangeDetail]
    _item_set: typing.Set[str]

    def __init__(self):
        self._details = []
        self._item_set = set()

    def append(
        self,
        stockchange_detail: StockChangeDetail,
        stockchange_subdetail: StockChangeSubDetail,
    ):
        """
        Append
        """
        itmref = stockchange_detail.itmref
        if itmref in self._item_set:
            for detail in self._details:
                if detail == itmref:
                    detail.subdetails.append(stockchange_subdetail)
                    return
        self._item_set.add(itmref)
        #stockchange_detail.fill()
        stockchange_detail.append(stockchange_subdetail)
        self._details.append(stockchange_detail)

    def __iter__(self):
        return iter(self._details)


class StockChange:
    """
    Warehouse stockchange, both header & details
    """

    header: StockChangeHeader
    details: StockChangeDetailList
    _sdhnum: str

    def __init__(self):
        self.header = StockChangeHeader()
        self._sdhnum = ""
        self.details = StockChangeDetailList()

    def append(
        self,
        stockchange_detail: StockChangeDetail,
        stockchange_subdetail: StockChangeSubDetail,
    ):
        """
        Add detail information.
        """
        self.details.append(stockchange_detail, stockchange_subdetail)

    @property
    def sdhnum(self):
        """
        shipment number
        """
        return self._sdhnum

    @sdhnum.setter
    def sdhnum(self, value: str):
        if self._sdhnum != value:
            self._sdhnum = value
            if value:
                self._fill_info_from_shipment()

    # def _get_shipment_from_x3(self) -> records.Record:
        # """
        # Fetch shipment from X3 database.
        # """
        # with yamamotoyama.get_connection('test') as db_connection:#todo remove 'test'
            # return db_connection.query(
                # """
                # select
                    # [SDH].[STOFCY_0],
                    # [SDH].[SDHNUM_0],
                    # [SDH].[SALFCY_0],
                    # [SDH].[BPCORD_0],
                    # [SDH].[CUR_0],
                    # [SDH].[SOHNUM_0]
                # from [FY23TEST].[SDELIVERY] [SDH]--TODO change back to [PROD]
                # where 
                    # [SDH].[SDHNUM_0] = :shipment
                # """,
                # shipment=self.sdhnum,
            # ).first()

    # def _fill_info_from_shipment(self):
        # """
        # When we learn the SOHNUM, we can copy information from the sales order.
        # """
        # result = self._get_shipment_from_x3()
        # self.header.stofcy = result.STOFCY_0
        # self.header.sdhnum = result.SDHNUM_0
        # self.header.salfcy = result.SALFCY_0
        # self.header.bpcord = result.BPCORD_0
        # self.header.cur = result.CUR_0
        # self.header.sohnum = result.SOHNUM_0


    def output(self, import_file: typing.TextIO):
        """
        Output entire order to import_file.
        """
        output = functools.partial(
            yamamotoyama.x3_imports.output_with_file, import_file
        )
        output(self.header.convert_to_strings())
        for detail in self.details:
            output(detail.convert_to_strings())
            for subdetail in detail.subdetails:
                #shipment = detail.sdhnum
                #item = detail.itmref
                output(subdetail.convert_to_strings())
                # for record in subdetail.stojous(shipment, item):
                    # output(subdetail.convert_to_strings())
                    # output(record)


if __name__ == "__main__":
    main()