#!/usr/bin/env python3
"""
gen_launchers.py -- generate one Windows .bat per runnable staged scene
(patha\\launch\\RUN_<PRODUCT>_<SCENE>.BAT), each starting the virtual board +
window + DOSBox via run_demo.py. Also writes launch\\MENU.BAT (a picker).

Skips scenes in the MUNGA key=value dialect (they hang FLYK's parser) and the
known cwd-only loaders (HPDAVE BDEMO/SAND/TEMP).

    python gen_launchers.py
"""
import os, re, glob

HERE = os.path.dirname(os.path.abspath(__file__))
STAGE = r"c:\temp\flykc"
OUT = os.path.join(HERE, "launch")
SKIP = {("HPDAVE", "BDEMO"), ("HPDAVE", "SAND"), ("HPDAVE", "TEMP")}


def munga_dialect(path):
    """MUNGA map-scenes use key=value lines (viewangle=60.0) FLYK can't read."""
    try:
        head = open(path, encoding='latin1').read(600)
    except OSError:
        return True
    return bool(re.search(r'(?m)^\s*(viewangle|clip|fog|backgnd)\s*=', head))


def main():
    os.makedirs(OUT, exist_ok=True)
    entries = []
    for prod in ("HPDAVE", "STDAVE", "RPDAVE", "BTDAVE", "FX"):
        pdir = os.path.join(STAGE, prod)
        if not os.path.isdir(pdir):
            continue
        for scn in sorted(glob.glob(os.path.join(pdir, "*.SCN"))):
            name = os.path.splitext(os.path.basename(scn))[0].upper()
            if (prod, name) in SKIP or munga_dialect(scn):
                continue
            # ambient particle sim only where it belongs (underwater HPDAVE)
            sfx = " --sfx" if (prod, name) in {
                ("HPDAVE", "SHARKS"), ("HPDAVE", "SDEMO"), ("HPDAVE", "BDDEMO"),
                ("HPDAVE", "FISHSPLS"), ("HPDAVE", "BDPAL")} else ""
            bat = os.path.join(OUT, f"RUN_{prod}_{name}.BAT")
            with open(bat, "w") as fp:
                fp.write(
                    "@echo off\r\n"
                    f"rem {prod}\\{name}.SCN on the virtual VelociRender board\r\n"
                    f"cd /d \"{HERE}\"\r\n"
                    f"python run_demo.py {name} --dir {prod} --prefix {name.lower()}{sfx}\r\n"
                    "pause\r\n")
            entries.append((prod, name))
            print(f"  RUN_{prod}_{name}.BAT")

    with open(os.path.join(OUT, "MENU.BAT"), "w") as fp:
        fp.write("@echo off\r\nsetlocal enabledelayedexpansion\r\n:menu\r\ncls\r\n"
                 "echo === DPL3 virtual VelociRender scene launcher ===\r\necho.\r\n")
        for i, (prod, name) in enumerate(entries, 1):
            fp.write(f"echo   {i:3}. {prod:8} {name}\r\n")
        fp.write("echo.\r\nset /p pick=scene number (or Q): \r\n"
                 "if /i \"%pick%\"==\"Q\" exit /b\r\n")
        for i, (prod, name) in enumerate(entries, 1):
            fp.write(f"if \"%pick%\"==\"{i}\" call \"%~dp0RUN_{prod}_{name}.BAT\"\r\n")
        fp.write("goto menu\r\n")
    print(f"\n{len(entries)} launchers + MENU.BAT -> {OUT}")


if __name__ == "__main__":
    main()