import os
import subprocess
import threading
import warnings
import pcraster


class AguilaThread(threading.Thread):

    def __init__(self,
            *arguments,
            **keywords):
        threading.Thread.__init__(self)
        self.arguments = arguments
        self.keywords = keywords
        self.created_files_names = []

    def __del__(self):
        # Get rid of any files we created.
        for filename in self.created_files_names:
            os.remove(filename)

    def parse_arguments(self,
            arguments):
        argument_list = []
        for argument in arguments:
            assert isinstance(argument, (str, list, pcraster.Field)), \
                "{} has type {}".format(argument, type(argument))

            if isinstance(argument, str):
                argument_list.append(argument)
            elif isinstance(argument, list):
                argument_list.append(" + ".join(self.parse_arguments(argument)))
            elif isinstance(argument, pcraster.Field):
                with warnings.catch_warnings():
                    # RuntimeWarning: tempnam is a potential security risk to
                    # your program.
                    warnings.simplefilter("ignore")
                    temp_name = os.tempnam(os.getcwd())
                pcraster.report(argument, temp_name)
                self.created_files_names.append(temp_name)
                argument_list.append(temp_name)

        return argument_list

    def run(self):
        argument_list = self.parse_arguments(self.arguments)
        command = "aguila {}".format(" ".join(argument_list))
        subprocess.call(command, shell=True)


def aguila(
        *arguments,
        **keywords):
    """
    Each argument is taken to be a raster or a list of rasters. Each raster
    should be the name of a raster file on disk or a variable resulting
    from a PCRaster operation.

    Individual rasters end up in separate visualisation windows. The rasters
    from a list of rasters ends in a single visualisation window.
    """
    thread = AguilaThread(*arguments, **keywords)
    thread.start()
    # Don't join. Just return to the caller.
    # thread.join()