#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import os

from metafile import Metafile, MalformedMetafileError, NoPathDefinedError

class Persoconf(object):
    """The root of a persoconf"""

    def __init__(self, path, metafile="META"):
        self.path     = path
        self.metafile = metafile

        self.check_validity()


    # --------------------------------------
    def check_validity(self):
        """Check if this Persoconf has a valid path"""

        if not os.path.isdir(self.path):
            if os.path.exists(self.path):
                raise FileInsteadOfDirError("Persoconf root '%s' exists but " \
                                            "is a file"
                                            % self.path )
            else:
                raise PersoconfRootDoesNotExistError("Persoconf root '%s' " \
                                                     "does not exist"
                                                     % self.path )

        return

    # --------------------------------------
    def list_apps(self, logger=None):
        """List all apps in the persoconf repo. Returns a dictionnary
        { appname -> Metafile ="""

        apps_list = {}

        for potential_app in os.listdir(self.path):

            try:
                # Try to initialize a metafile from the path.
                appmeta = Metafile(json_path = self.path     +"/"+
                                               potential_app +"/"+
                                               self.metafile)

                apps_list[appmeta.name] = appmeta

            except FileNotFoundError:
                if logger is not None:
                    logger.info("No metafile %s in %s, probably not an app; " \
                                "ignoring"
                                % (self.metafile, potential_app) )
                continue

            except MalformedMetafileError:
                if logger is not None:
                    logger.warning("Malformed metafile %s in app %s ; ignoring"
                                   % (self.metafile, potential_app) )
                continue

        return apps_list



class FileInsteadOfDirError(Exception):
    """We expected a directory but got a file instead"""
    def __init__(self, message):
        Exception.__init__(self, message)


class PersoconfRootDoesNotExistError(Exception):
    """The Persoconf root directory was not created"""
    def __init__(self, message):
        Exception.__init__(self, message)