#!/usr/bin/env python3
"""
Create a 997 and load it into the proper outgoing folder

A 997 is a functional acknowledgment, we received the EDI tranmission contorl number and reply back with it
"""
import dataclasses
import datetime
import io
import pathlib
import typing
import shutil
import pprint

import records  # type: ignore
import yamamotoyama  # type: ignore


THIS_DIRECTORY = pathlib.Path(__file__).parent
X12_DIRECTORY = THIS_DIRECTORY / "outgoing"
INCOMING_ARCHIVE_DIRECTORY = THIS_DIRECTORY / "incoming"
ACK_DIRECTORY = THIS_DIRECTORY / "997_processing"


AK1_MAPPING = {
"944" : "RE",
"945" : "SW",
"947" : "AW",
"846" : "IB",
"867" : "PT",
}

def main():
    """
    Do it!
    """
    for edi_filename in ACK_DIRECTORY.iterdir():
        write_997(edi_filename)
        shutil.move(edi_filename, INCOMING_ARCHIVE_DIRECTORY / "archive" / edi_filename.name)


def write_997(edi_filename: pathlib.Path):
    """
    Write out a 997 to a file
    """
    group_control_number = ''
    transaction_set_control_number = ''
    company = ''
    edi_type = ''
    with open(edi_filename, 'r') as edi_file:
        for line in edi_file:
            line = line.split("~")
            for field in line:
                fields = field.split("*")
                if fields[0] == 'ISA':
                    group_control_number = fields[13]
                    company_longname = fields[6]
                elif fields[0] == 'GS':
                    company = fields[2]
                    transaction_set_control_number = fields[6]
                elif fields[0] == 'ST':
                    edi_type = fields[1]
    now = datetime.datetime.now()
    datestamp_string = now.strftime("%Y-%m-%d-%H-%M-%S")
    with (X12_DIRECTORY / f"{company}-{transaction_set_control_number}-{datestamp_string}-997.edi").open(
        "w", encoding="utf-8", newline="\n"
    ) as x12_file:
        raw_control_number = control_number()
        output = x12_file.write
        header = write_997_header(raw_control_number,company_longname,company,edi_type,group_control_number)
        lines = write_997_lines(edi_type,transaction_set_control_number)
        footer = write_997_footer(raw_control_number,group_control_number)
        output(header)
        output(lines)
        output(footer)


def write_997_header(raw_control_number,company_longname,company,edi_type,group_control_number):
    now = datetime.datetime.now()
    date = now.strftime("%y%m%d")
    longdate = now.strftime("%Y%m%d")
    time = now.strftime("%H%M")
    short_control_number = f"{raw_control_number:04}"
    interchange_control_number = (
        f"{raw_control_number:09}"  # Format to 9 characters
    )
    AK1 = AK1_MAPPING[edi_type]
    
    header_string = ''.join([
        f"ISA*00*          *00*          *ZZ*YAMAMOTOYAMA   *ZZ*{company_longname}*",
        date,
        "*",
        time,
        "*U*00401*",
        interchange_control_number,
        "*0*P*>~",
        "GS*",
        "FA*",
        "YAMAMOTOYAMA*",
        company+"*",
        longdate+"*",
        time+"*",
        short_control_number+"*",
        "X*",
        "004010~",
        "ST*",
        "997*0001~",
        "AK1*",
        AK1+"*",
        group_control_number+"~",
    ]
    )
    return header_string


def write_997_lines(edi_type,transaction_set_control_number):
    #short_control_number = f"{group_control_number:04}"
    detail_string = ''.join([
    "AK2*",
    edi_type+"*",
    transaction_set_control_number+"~"
    "AK5*",
    "A~",
    "AK9*A*1*1*1~",
    ])
    return detail_string

def write_997_footer(raw_control_number,group_control_number):
    interchange_control_number = (
        f"{raw_control_number:09}"  # Format to 9 characters
    )
    short_control_number = f"{raw_control_number:04}"
    footer_string = ''.join([
    "SE*6*0001~",
    "GE*1*",
    str(short_control_number)+"~",
    "IEA*1*",
    str(interchange_control_number)
    ])
    return footer_string


def control_number() -> int:
    """
    Next EDI serial number
    """
    filepath = pathlib.Path(__file__).with_suffix(".remember")
    encoding = "utf-8"
    newline = "\n"
    try:
        with filepath.open(
            "r", encoding=encoding, newline=newline
        ) as remember_file:
            number = int(remember_file.readline().rstrip("\n"))
    except (OSError, ValueError):
        number = 0
    number += 1
    with filepath.open("w", encoding=encoding, newline=newline) as remember_file:
        remember_file.write(f"{number}\n")
    return number


if __name__ == "__main__":
    main()