def decode_psu_status(hex_input):
    """
    PSU Decoder by Parv Ashwani
    ---------------------------
    Decodes a PSU status hex value into human-readable descriptions
    based on standard IPMI bitmask definitions.
    """
    bitmask_definitions = {
        1:   "Presence Detected",
        2:   "Failure Detected",
        4:   "Predictive Failure",
        8:   "Input Lost",
        16:  "Out of Range",
        32:  "Detected Out of Range",
        64:  "Configuration Error",
        128: "Reserved"
    }

    print("\n" + "="*50)
    print(f"DECODING INPUT: {hex_input}")
    print("="*50)

    try:
        decimal_value = int(hex_input, 16)
    except ValueError:
        print("Error: Invalid hex input.")
        return

    print(f"\n[Step 1] Hex to Decimal Conversion:")
    print(f"  Hex '{hex_input}' --> Decimal {decimal_value}")
    active_flags = []
    math_parts = []

    print(f"\n[Step 2] Bitwise Analysis (Checking switches):")
    for bit_value, description in sorted(bitmask_definitions.items(), reverse=True):

        if (decimal_value & bit_value) == bit_value:
            status = "ON"
            active_flags.append(description)
            math_parts.append(str(bit_value))
            print(f"  - Checking Bit {bit_value:>3}: {status}  --> Found: {description}")
        else:
            # Optional: Uncomment below line to see checks that failed
            # print(f"  - Checking Bit {bit_value:>3}: OFF")
            pass

    print(f"\n[Step 3] Calculation Explanation:")
    if math_parts:
        equation = " + ".join(math_parts)
        print(f"  Math: {equation} = {decimal_value}")
    else:
        print("  No active flags found (Value is 0).")

    print(f"\n[RESULT]:")
    if active_flags:
        for flag in active_flags:
            print(f"  >> {flag}")
    else:
        print("  >> No active status flags.")


# ==========================================
# MAIN LOOP
# ==========================================
if __name__ == "__main__":
    print("--- PSU Status Decoder Tool ---")
    while True:
        user_input = input("\nEnter Hex value (e.g., 0xb) or 'q' to quit: ").strip()

        if user_input.lower() == 'q':
            print("Exiting...")
            print("Made with ☕︎ by Parv")
            break

        if user_input:
            decode_psu_status(user_input)