""" Header serializer """
__license__ = 'GPL-3.0-only'

import re
import sys
from pathlib import Path
from .cgen import as_str

class Header:
    """ Python representation of a header """
    def __init__(self, name: str):
        self.name = name
        self.file = None
        self.variables = []
        self.functions = []
        self.structs = []

    def __enter__(self):
        if self.name is None:
            self.file = sys.stdout
        else:
            self.file = open(self.name, mode='w', encoding='utf-8')
        return self

    def __exit__(self, exc_type, exc_value, traceback):
        if self.file != sys.stdout:
            self.file.close()

    def header_guard(self, mock=False):
        """ Generate header guard from name """
        name = Path(self.name).stem
        guard = '_'.join(re.findall('.[^A-Z]*', name))
        guard = guard.upper().replace('.', '_')
        if mock:
            return f'MOCK_{guard}_HH'
        return f'{guard}_H'

    def _print(self, items):
        for item in items:
            print(as_str(item), file=self.file)
        if len(items) > 0:
            print('', file=self.file)

    def print_c_header(self):
        """ Print C header """
        header_guard = self.header_guard()
        print(f'#ifndef {header_guard}', file=self.file)
        print(f'#define {header_guard}\n', file=self.file)

        self._print(self.structs)
        self._print(self.variables)
        self._print(self.functions)

        print(f'#endif // {header_guard}', file=self.file)