"""
Tax, brokerage, and slippage calculator for Indian equity intraday trades.
Covers: brokerage (flat Rs 20), STT, exchange txn charge, GST, SEBI fee, stamp duty.
"""


def calculate_taxes_and_slippage(
    price_0930, price_1510, qty,
    high_0930, low_0930, high_1510, low_1510,
    is_short,
):
    """
    Compute net PnL after realistic slippage and all Indian regulatory charges.

    Slippage model:  10% of the 1-min candle's (high - low) range,
    applied as an adverse fill on both entry and exit.

    Returns
    -------
    (net_pnl, total_taxes, exec_buy_price, exec_sell_price)
    """
    slip_0930 = (high_0930 - low_0930) * 0.10
    slip_1510 = (high_1510 - low_1510) * 0.10

    if not is_short:
        # LONG: Buy at 09:30 (ask penalty), Sell at 15:10 (bid penalty)
        actual_buy_price  = price_0930 + slip_0930
        actual_sell_price = price_1510 - slip_1510
    else:
        # SHORT: Sell at 09:30 (bid penalty), Buy-to-cover at 15:10 (ask penalty)
        actual_sell_price = price_0930 - slip_0930
        actual_buy_price  = price_1510 + slip_1510

    buy_turnover  = actual_buy_price * qty
    sell_turnover = actual_sell_price * qty
    total_turnover = buy_turnover + sell_turnover

    brokerage      = 20.0
    stt            = sell_turnover * 0.00025
    exc_txn_charge = total_turnover * 0.0000325
    gst            = (brokerage + exc_txn_charge) * 0.18
    sebi_fee       = total_turnover * 0.000001
    stamp_duty     = buy_turnover * 0.00003

    total_taxes = brokerage + stt + exc_txn_charge + gst + sebi_fee + stamp_duty

    gross_pnl = (actual_sell_price - actual_buy_price) * qty
    net_pnl   = gross_pnl - total_taxes

    return net_pnl, total_taxes, actual_buy_price, actual_sell_price