"""Generate the tileset palette `twu01palstd.itp` from tiles.py.

    python make_itp.py [out.itp]      # default: twu01palstd.itp

The toolset loads `<set>palstd.itp` when it registers a tileset; without it the
set fails to register (blank name in the New Area wizard, "could not create
area"). Every stock/custom set on disk ships one. It's a GFF `ITP ` file: a MAIN
list of palette categories, each a struct with an ID byte and a LIST of
{RESREF, STRREF} tile entries.

We emit one flat category listing all 40 tile model resrefs. Each entry carries
a local NAME cexostring (NOT a STRREF) — this is what stock/custom sets without a
tileset TLK do (verified against wut01palstd.itp). Entries with neither NAME nor
a valid STRREF render blank AND non-selectable in the toolset palette. Built as
JSON and converted to GFF with neverwinter.nim's nwn_gff (must be on PATH).
"""

import json
import os
import subprocess
import sys
import tempfile

import tiles

NO_STRREF = 0xFFFFFFFF   # category folder: no dialog.tlk name (cosmetic, blank folder)


def tile_label(s):
    """Readable palette name, e.g. '[flat] cobble_plain'."""
    return f"[{s['kind']}] {s['name']}"


def build():
    entries = [{"__struct_id": 0,
                "NAME": {"type": "cexostring", "value": tile_label(s)},
                "RESREF": {"type": "resref", "value": tiles.resref(s)}}
               for s in tiles.TILES]
    return {
        "__data_type": "ITP ",
        "MAIN": {"type": "list", "value": [
            {"__struct_id": 0,
             "ID": {"type": "byte", "value": 0},
             "STRREF": {"type": "dword", "value": NO_STRREF},
             "LIST": {"type": "list", "value": entries}},
        ]},
    }


def main():
    out = sys.argv[1] if len(sys.argv) > 1 else f"{tiles.PREFIX}palstd.itp"
    with tempfile.NamedTemporaryFile("w", suffix=".json", delete=False) as tf:
        json.dump(build(), tf)
        js = tf.name
    try:
        subprocess.run(["nwn_gff", "-i", js, "-l", "json", "-k", "gff", "-o", out],
                       check=True)
    finally:
        os.unlink(js)
    print(f"wrote {out}  ({len(tiles.TILES)} tile palette entries)")


if __name__ == "__main__":
    main()