from configparser import ConfigParser
import os


class Config:
    DEFAULT_XML_REFERENCE_TYPE = 'http://www.gzs.si/shemas/eslog/racun/1.6#Racun'
    DEFAULT_CONFIG_DIR = os.path.join(os.path.expanduser('~'), '.config')

    def __init__(self, config_file):
        self.config_file = os.path.join(self.DEFAULT_CONFIG_DIR, config_file)
        self.config = ConfigParser()
        self.config.read(self.config_file)
        self.errors = []

    def exists(self):
        return 'settings' in self.config and 'xmlschema' in self.config['settings'] and\
                        'certificate' in self.config['settings']

    def get_data(self):
        return {
            'xmlreftype': self.config.get('settings', 'xmlreftype'),
            'xmlschema': self.config.get('settings', 'xmlschema'),
            'certificate': self.config.get('settings', 'certificate')
        }

    def verify_data(self):
        if not self.exists():
            self.errors.append('Config wasn\'t set up yet.')
            return False

        if not os.path.isfile(self.config['settings']['xmlschema']):
            self.errors.append('XML Schema file doesn\'t exist.')
        if not os.path.isfile(self.config['settings']['certificate']):
            self.errors.append('Certificate file doesn\'t exist.')
        return len(self.errors) == 0

    def get_errors(self):
        errors = self.errors.copy()
        self.errors.clear()
        return errors

    def save_data(self, config):
        if 'settings' not in self.config:
            self.config.add_section('settings')
            self.config.set('settings', 'xmlreftype', self.DEFAULT_XML_REFERENCE_TYPE)
        self.config.set('settings', 'xmlschema', config['xmlschema'])
        self.config.set('settings', 'certificate', config['certificate'])
        try:
            if not os.path.isfile(self.config_file):
                os.makedirs(self.DEFAULT_CONFIG_DIR, exist_ok=True)
            with open(self.config_file, 'w') as f:
                self.config.write(f)
        except:
            raise ConfigException('Cannot write config.')


class ConfigException(Exception):
    pass