#!/usr/bin/env python3

import constants
import os


class file_writer:
    """Helper context to write a pages file."""

    def __init__(self, filename: str, *, transformations=[]):
        self.full_filename = os.path.join(constants.pages_dir, filename)
        self.xforms = [file_writer.remove_tricky_unicode]
        self.xforms.extend(transformations)
        self.f = None

    @staticmethod
    def remove_tricky_unicode(x: str) -> str:
        try:
            x = x.replace("\u2018", "'").replace("\u2019", "'")
            x = x.replace("\u201c", '"').replace("\u201d", '"')
            x = x.replace("\u2e3a", "-").replace("\u2014", "-")
        except:
            pass
        return x

    def write(self, data):
        for xform in self.xforms:
            data = xform(data)
        self.f.write(data.encode("utf-8"))

    def __enter__(self):
        self.f = open(self.full_filename, "wb")
        return self

    def __exit__(self, exc_type, exc_value, exc_traceback):
        self.close()

    def done(self):
        self.close()

    def close(self):
        self.f.close()


# Test
# def toupper(x):
#   return x.upper()
#
# with file_writer("test", transformations=[toupper]) as fw:
#    fw.write(u"Another test!!")