import os

class SfiConfig:
    defaults = { 'SFI_AUTH' : None,
                 'SFI_USER' : None,
                 'SFI_SLICE' : None,
                 'SFI_REGISTRY' : "http://www.planet-lab.org:12345",
                 'SFI_AM' : "http://www.planet-lab.org:12346",
                 'SFI_SM' : "http://www.planet-lab.org:12347",
                 'SFACE_VERBOSE' : False,
                 'SFACE_DEBUG' : False,
                 }

    def __init__(self):
        self.read_config()

    def read_config(self):
        filename = os.path.expanduser("~/.sfi/sfi_config")
        execfile(filename, SfiConfig.__dict__)
        for (k,v) in SfiConfig.defaults.items():
            if not hasattr(SfiConfig,k): setattr(SfiConfig,k,v)
        if SfiConfig.SFACE_VERBOSE:
            print "After reading config from %s"%filename
            for (k,v) in SfiConfig.defaults.items():
                print "%-20s: %r"%(k,getattr(SfiConfig,k))

    def save_config(self):
        config_keys = SfiConfig.defaults.keys()
        configfile = os.path.expanduser("~/.sfi/sfi_config")
        tmpfile = configfile + ".tmp"

        out = open(tmpfile, "w")
        for line in open(os.path.expanduser("~/.sfi/sfi_config")):
            try:
                key, val = line.split('=')
                key = key.strip()
                val = val.strip()
                if key in config_keys:
                    line = "%s = '%s'\n" % (key, getattr(self, key))
            except:
                pass
            out.write(line)
        out.close()

        os.unlink(configfile)
        os.rename(tmpfile, configfile)
                    

    def getAuthority(self):
        return SfiConfig.SFI_AUTH

    def getUser(self):
        return SfiConfig.SFI_USER

    def setUser(self, user):
        SfiConfig.SFI_USER = user

        # Should probably get authority from user record instead...
        a = user.split('.')
        SfiConfig.SFI_AUTH = '.'.join(a[:len(a)-1])

    def getSlice(self):
        return SfiConfig.SFI_SLICE

    def setSlice(self, slice):
        SfiConfig.SFI_SLICE = slice

    def registry(self):
        return SfiConfig.SFI_REGISTRY

    def slicemgr(self):
        return SfiConfig.SFI_SM

    def aggmgr(self):
        return SfiConfig.SFI_AM

# configuration singleton
config = SfiConfig()