import os
import sys
import warnings

# Check if JuliaCall is already loaded, and if so, warn the user
# about the relevant environment variables. If not loaded,
# set up sensible defaults.
if "juliacall" in sys.modules:
    warnings.warn(
        "juliacall module already imported. "
        "Make sure that you have set the environment variable `PYTHON_JULIACALL_HANDLE_SIGNALS=yes` to avoid segfaults. "
        "Also note that PySR will not be able to configure `PYTHON_JULIACALL_THREADS` or `PYTHON_JULIACALL_OPTLEVEL` for you."
    )
else:
    # Required to avoid segfaults (https://juliapy.github.io/PythonCall.jl/dev/faq/)
    if os.environ.get("PYTHON_JULIACALL_HANDLE_SIGNALS", "yes") != "yes":
        warnings.warn(
            "PYTHON_JULIACALL_HANDLE_SIGNALS environment variable is set to something other than 'yes' or ''. "
            + "You will experience segfaults if running with multithreading."
        )

    if os.environ.get("PYTHON_JULIACALL_THREADS", "auto") != "auto":
        warnings.warn(
            "PYTHON_JULIACALL_THREADS environment variable is set to something other than 'auto', "
            "so PySR was not able to set it. You may wish to set it to `'auto'` for full use "
            "of your CPU."
        )

    # TODO: Remove these when juliapkg lets you specify this
    for k, default in (
        ("PYTHON_JULIACALL_HANDLE_SIGNALS", "yes"),
        ("PYTHON_JULIACALL_THREADS", "auto"),
        ("PYTHON_JULIACALL_OPTLEVEL", "3"),
    ):
        os.environ[k] = os.environ.get(k, default)

# Next, automatically load the juliacall extension if we're in a Jupyter notebook
if os.environ.get("PYSR_AUTOLOAD_EXTENSIONS", "yes") in {"yes", ""}:
    try:
        get_ipython = sys.modules["IPython"].get_ipython

        if "IPKernelApp" not in get_ipython().config:
            raise ImportError("console")

        print(
            "Detected Jupyter notebook. Loading juliacall extension. Set `PYSR_AUTOLOAD_EXTENSIONS=no` to disable."
        )

        # TODO: Turn this off if juliacall does this automatically
        get_ipython().run_line_magic("load_ext", "juliacall")
    except Exception:
        pass
elif os.environ["PYSR_AUTOLOAD_EXTENSIONS"] not in {"no", "yes", ""}:
    warnings.warn(
        "PYSR_AUTOLOAD_EXTENSIONS environment variable is set to something other than 'yes' or 'no' or ''."
    )


from juliacall import Main as jl  # type: ignore

# Finally, overwrite the seval function to use Meta.parseall
# instead of Meta.parse.
if jl.seval('VERSION >= v"1.9.0-DEV.0"'):
    # TODO: Overwrite this once PythonCall.jl is updated:
    def seval(s: str):
        return jl.eval(jl.Meta.parseall(s))

    jl.seval = seval

jl.seval("using SymbolicRegression")
SymbolicRegression = jl.SymbolicRegression