"""
Dump the full DEVMODE of the PT-E560BT driver.

The printed length is far shorter than the page we send, which suggests the
driver is cropped or scaled by a setting of its own. This prints every field
that could cause that, so the behaviour can be explained rather than guessed.
"""

import win32print

PRINTER = "Brother PT-E560BT"

ORIENTATION = {1: "portrait", 2: "landscape"}

FIELDS_OF_INTEREST = [
    "PaperSize",
    "PaperLength",
    "PaperWidth",
    "Orientation",
    "Scale",
    "Copies",
    "DefaultSource",
    "PrintQuality",
    "Color",
    "Duplex",
    "TTOption",
    "Collate",
    "FormName",
    "LogPixels",
    "BitsPerPel",
    "Nup",
    "DisplayFlags",
    "DisplayFrequency",
    "ICMMethod",
    "ICMIntent",
    "MediaType",
    "DitherType",
    "Reserved1",
    "Reserved2",
    "PanningWidth",
    "PanningHeight",
]


def main() -> int:
    info = win32print.GetPrinter(win32print.OpenPrinter(PRINTER), 2)
    dm = info.get("pDevMode")

    print(f"Printer   : {PRINTER}")
    print(f"Driver    : {info.get('pDriverName')}")
    print(f"Port      : {info.get('pPortName')}")

    print(f"\nDEVMODE size       : {dm.Size} bytes")
    print(f"DriverExtra        : {dm.DriverExtra} bytes")
    print(f"Fields set (bitset): 0x{dm.Fields:x}")

    print("\nFields of interest:")
    for name in FIELDS_OF_INTEREST:
        if not hasattr(dm, name):
            continue
        try:
            value = getattr(dm, name)
        except Exception as exc:  # noqa: BLE001
            print(f"  {name:<18}: <error {exc}>")
            continue
        extra = ""
        if name == "Orientation":
            extra = f"  ({ORIENTATION.get(value, '?')})"
        elif name in ("PaperLength", "PaperWidth") and isinstance(value, int):
            extra = f"  ({value / 10:.1f} mm)"
        print(f"  {name:<18}: {value}{extra}")

    # Any other integer attributes the struct exposes.
    print("\nAll remaining numeric fields:")
    shown = set(FIELDS_OF_INTEREST)
    for name in sorted(dir(type(dm))):
        if name.startswith("_") or name in shown:
            continue
        try:
            value = getattr(dm, name)
        except Exception:  # noqa: BLE001
            continue
        if isinstance(value, int) and value != 0:
            print(f"  {name:<20}: {value}")

    # Explain the relationship between page, printable area and paper length.
    print("\nInterpretation:")
    pl = dm.PaperLength / 10
    pw = dm.PaperWidth / 10
    print(f"  paper wxh as stored : {pw:.1f} x {pl:.1f} mm "
          f"(orientation {ORIENTATION.get(dm.Orientation, '?')})")
    if dm.Orientation == 2:
        print(f"  rotated for printing: {pl:.1f} mm along tape x {pw:.1f} mm across")
    print(f"  dmScale             : {dm.Scale}% (100 = no driver scaling)")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())