import os
import simplejson

import actions
from context import Context
from rules import Rule

def __stringise(d):
    new_d = {}
    for k in d.iterkeys():
        new_d[str(k)] = d[k]
    return new_d

def parse(filename):
    if filename is None:
        configdir = os.environ.get("XDG_CONFIG_HOME", os.path.expanduser("~/.config/"))
        filename = os.path.join(configdir, "shackleton", "config.json")
    
    if not os.path.exists(filename):
        raise IOError("File %s not found" % filename)

    result = {}

    for (context_name, context_data) in simplejson.load(open(filename)).iteritems():
        context = Context(context_name)
        result[context_name] = context

        for data in context_data["rules"]:
            rule_name = data.pop("source")
            context.addRule(Rule(rule_name, **__stringise(data)))
        
        for data in context_data.get("enter", []):
            action_name = data.pop("action")
            cls = getattr(actions, action_name, None)
            if cls:
                action = cls(**__stringise(data))
                context.addEnterAction(action)

        for data in context_data.get("leave", []):
            action_name = data.pop("action")
            cls = getattr(actions, action_name, None)
            if cls:
                action = cls(**__stringise(data))
                context.addLeaveAction(action)
    
    return result


if __name__ == "__main__":
    import sys
    print parse(sys.argv[1])