from sys import stderr, argv;
from base64 import b64encode, b64decode;
from py_mini_racer import MiniRacer;

with open("xlsx.full.min.js", "rb") as f:
    sheetjs = f.read().decode("utf-8");

with open(argv[1], "rb") as f:
    file_data = b64encode(f.read()).decode("ascii");

ctx = MiniRacer();

global_scope = ctx.eval("this");

ctx.eval(sheetjs);
version = ctx.eval("XLSX.version");
print(f"SheetJS Version: {version}", file=stderr);

ctx._ctx.set_object_item(global_scope, "fileData", file_data);
ctx.eval("var wb = XLSX.read(fileData, {type:'base64'});");

csv = ctx.eval("XLSX.utils.sheet_to_csv(wb.Sheets[wb.SheetNames[0]]);");
print(csv);

xlsb = ctx.eval("XLSX.write(wb, {type: 'base64', bookType: 'xlsb'})");
with open("SheetJSMiniRacer.xlsb", "wb") as f:
    f.write(b64decode(xlsb));

ctx.close();