import os
import shutil
import warnings
import xml.etree.ElementTree as ET

from ast_parser.general_unparser import GeneralUnparser
from constants import *


def to_gazprea_type(ty: str):  # TODO implement the compound types
    if ty == GAZ_INT_KEY:
        return "integer"
    elif ty == GAZ_BOOL_KEY:
        return "boolean"
    elif ty == GAZ_FLOAT_KEY:
        return "real"
    elif ty == GAZ_CHAR_KEY:
        return "character"
    elif ty == GAZ_STRING_KEY:
        return "string[*]"
    else:
        raise Exception("Unknown type: " + ty)


def _unparse_arg(node):
    return "{} {}".format(to_gazprea_type(node.get(GAZ_TY_KEY)), node.get(GAZ_NAME_KEY))


def to_gaz_value(val):
    if val in ["True", "False"]:
        return val.lower()
    else:
        return str(val)


def to_gaz_op(param):
    if param == "negation" or param == "subtraction":
        return "-"
    elif param == "addition":
        return "+"
    elif param == "multiplication":
        return "*"
    elif param == "division":
        return "/"
    elif param == "modulus":
        return "%"
    elif param == "power":
        return "^"
    elif param == "equality":
        return "=="
    elif param == "inequality":
        return "!="
    elif param == "less-than":
        return "<"
    elif param == "less-than-or-equal":
        return "<="
    elif param == "greater-than":
        return ">"
    elif param == "greater-than-or-equal":
        return ">="
    else:
        warnings.warn("Warning, unknown operator: " + param)
        return param


class GazUnparser(GeneralUnparser):
    def __init__(self, input_ast, from_xml: bool = False):
        super().__init__(input=input_ast, from_xml=from_xml,
                         endline=";\n",
                         instream_end_delimiter=" <- std_input",
                         outstream_end_delimiter=" -> std_output", )

    def format_variable(self, mut, ty, name, declaration: bool = False):
        if declaration:
            return "{} {} {}".format(mut, ty, name)
        else:
            return "{}".format(name)

    def translate_value(self, val):
        if val in ["True", "False"]:
            return val.lower()
        else:
            return str(val)

    def translate_op(self, param, ty=None):
        return to_gaz_op(param)

    def translate_type(self, ty):
        return to_gazprea_type(ty)

    def function_declaration(self, xml_tag, args, name, return_type):
        return "{} {}{} {} ".format(
            xml_tag,
            name,
            args,
            return_type,
        )

    def format_single_arg(self, ty, name):
        return "{} {}".format(ty, name)