import os
import copy
from p3 import configparser

# constant stuff (DFT = DEFAULT)

MAIN_SECTION    = 'papers'
DFT_CONFIG_PATH = os.path.expanduser('~/.papersrc')
DFT_PAPERS_DIR  = os.path.expanduser('~/.papers')
DFT_OPEN_CMD    = 'open'
try:
    DFT_EDIT_CMD = os.environ['EDITOR']
except KeyError:
    DFT_EDIT_CMD = 'vi'

DFT_IMPORT_COPY = 'yes'
DFT_IMPORT_MOVE = 'no'
DFT_COLOR       = 'yes'
DFT_PLUGINS     = 'texnote'

DFT_CONFIG = configparser.SafeConfigParser({
    'papers_dir'  : DFT_PAPERS_DIR,
    'open_cmd'    : DFT_OPEN_CMD,
    'edit_cmd'    : DFT_EDIT_CMD,
    'import_copy' : DFT_IMPORT_COPY,
    'import_move' : DFT_IMPORT_MOVE,
    'color'       : DFT_COLOR,
    'plugins'     : DFT_PLUGINS
    })

BOOLEANS = {'import-copy', 'import-move', 'color'}

DFT_CONFIG.add_section(MAIN_SECTION)


# package-shared config that can be accessed using :
# from configs import config
config = None

class Config(object):

    def __init__(self):
        object.__setattr__(self, '_cfg', copy.copy(DFT_CONFIG))

    def as_global(self):
        global config
        config = self

    def load(self, path = DFT_CONFIG_PATH):
        self._cfg.read(path)
        return self

    def save(self, path = DFT_CONFIG_PATH):
        with open(path, 'w') as f:
            self._cfg.write(f)

    def __setattr__(self, name, value):
        if type(value) is bool:
            BOOLEANS.add(name)
        self._cfg.set(MAIN_SECTION, name, str(value))

    def __getattr__(self, name):
        value = self._cfg.get(MAIN_SECTION, name)
        if name in BOOLEANS:
            value = str2bool(value)
        return value

    def items(self):
        for name, value in self._cfg.items(MAIN_SECTION):
            if name in BOOLEANS:
                value = str2bool(value)
            yield name, value

def str2bool(s):
    return str(s).lower() in ('yes', 'true', 't', 'y', '1')