import datetime
import argparse
from serenitas.ops.funds import Service
from serenitas.ops.trade_dataclasses import IAMDeal
from serenitas.analytics.dates import prev_business_day
from serenitas.utils.db import dbconn


def cancel_old_iam_trades(fund: str, cob: datetime.date, conn) -> "Iterable":
    """Finds and cancels old IAM trades"""
    with conn.cursor() as cursor:
        cursor.execute(
            "DELETE FROM iams WHERE trade_date=%s AND fund=%s RETURNING *",
            (cob, fund),
        )
        for row in cursor:
            trade_data = row._asdict()
            yield IAMDeal.from_dict(**trade_data)
        conn.commit()


def generate_new_iam_trades(fund: str, cob: datetime.date, conn) -> "Iterable":
    """Generates new IAM deals"""
    with conn.cursor() as cursor:
        cursor.execute(
            "SELECT * FROM list_iam(%s, %s)",
            (cob, fund),
        )
        for row in cursor:
            trade_data = row._asdict() | {"trade_date": cob}
            yield IAMDeal.from_dict(**trade_data)


def generate_new_iam_offset_trades(fund: str, cob: datetime.date, conn) -> "Iterable":
    """Generates offsets if the sma has already updated these IAM deals"""
    _ignore = {"BOWDST": ("GS_FCM",)}
    with conn.cursor() as cursor:
        cursor.execute(
            "SELECT broker, currency, fund, sum(-start_money) AS start_money "
            "FROM list_iam(%s, %s) GROUP BY (broker, currency, fund);",
            (cob, fund),
        )
        for row in cursor:
            if row.broker not in _ignore[fund]:
                trade_data = row._asdict() | {
                    "is_offset": True,
                    "folder": "M_CSH_CASH",
                    "portfolio": "CASH",
                    "trade_date": cob,
                }
                yield IAMDeal.from_dict(**trade_data)


def update_matured_iam_trades(fund: str, cob: datetime.date, conn) -> "Iterable":
    """Sets previous days as matured"""
    with conn.cursor() as cursor:
        cursor.execute(
            "UPDATE iams SET maturity=%s WHERE maturity is NULL AND trade_date<=%s AND fund=%s RETURNING *",
            (cob, prev_business_day(cob), fund),
        )
        for row in cursor:
            trade_data = row._asdict() | {}
            yield IAMDeal.from_dict(**trade_data)
        conn.commit()


def build_iam(fund: str, cob: datetime.date, conn, upload: bool):
    """Generates IAM file for globeop"""
    service = Service[fund]
    for old_iam in cancel_old_iam_trades(fund, cob, conn):
        service.push_trade(old_iam, "CANCEL")
    for new_iam in generate_new_iam_trades(fund, cob, conn):
        new_iam.stage()
    if fund == "BOWDST":
        for new_iam_offset in generate_new_iam_offset_trades(fund, cob, conn):
            new_iam_offset.stage()
    for iam in IAMDeal.commit(returning=True):
        service.push_trade(iam, "NEW")
    for update_iam in update_matured_iam_trades(fund, cob, conn):
        service.push_trade(update_iam, "UPDATE")
    buf, dest = service.build_buffer(trade_type="iam")
    if upload:
        service.upload(buf, dest.name)
    service().clear()


def parse_args():
    """Parses command line arguments"""
    parser = argparse.ArgumentParser(description="Generate IAM file for globeop")
    parser.add_argument(
        "cob",
        nargs="?",
        type=datetime.date.fromisoformat,
        default=prev_business_day(datetime.date.today()),
    )
    parser.add_argument("-n", "--no-upload", action="store_true", help="do not upload")
    return parser.parse_args()


def main():
    """Generates IAM files for globeop"""
    conn = dbconn("dawndb")
    args = parse_args()
    for fund in ("SERCGMAST", "BOWDST"):
        build_iam(fund, args.cob, conn, not args.no_upload)


if __name__ == "__main__":
    main()