import ConfigParser, re
import shlex

class confNDNHost():

    def __init__(self, name, app='', params='', cpu=None, cores=None, cache=None):
        self.name = name
        self.app = app
        self.uri_tuples = params
        self.params = params
        self.cpu = cpu
        self.cores = cores
        self.cache = cache

        # For now assume leftovers are NLSR configuration parameters
        self.nlsrParameters = params

    def __repr__(self):
        return 'Name: '    + self.name + \
               ' App: '    + self.app + \
               ' URIS: '   + str(self.uri_tuples) + \
               ' CPU: '    + str(self.cpu) + \
               ' Cores: '  + str(self.cores) + \
               ' Cache: '  + str(self.cache) + \
               ' Radius: ' + str(self.radius) + \
               ' Angle: '  + str(self.angle) + \
               ' NLSR Parameters: ' + self.nlsrParameters

class confNDNLink():

    def __init__(self,h1,h2,linkDict=None):
        self.h1 = h1
        self.h2 = h2
        self.linkDict = linkDict

    def __repr__(self):
        return 'h1: ' + self.h1 + ' h2: ' + self.h2 + ' params: ' + str(self.linkDict)

def parse_hosts(conf_arq):
    'Parse hosts section from the conf file.'
    config = ConfigParser.RawConfigParser()
    config.read(conf_arq)

    hosts = []

    items = config.items('nodes')

        #makes a first-pass read to hosts section to find empty host sections
    for item in items:
        name = item[0]
        rest = item[1].split()
        if len(rest) == 0:
            config.set('nodes', name, '_')
        #updates 'items' list
    items = config.items('nodes')

        #makes a second-pass read to hosts section to properly add hosts
    for item in items:

        name = item[0]

        rest = shlex.split(item[1])

        uris = rest
        params = {}
        cpu = None
        cores = None
        cache = None

        for uri in uris:
            if re.match("cpu",uri):
                cpu = float(uri.split('=')[1])
            elif re.match("cores",uri):
                cores = uri.split('=')[1]
            elif re.match("cache",uri):
                cache = uri.split('=')[1]
            elif re.match("mem",uri):
                mem = uri.split('=')[1]
            elif re.match("app",uri):
                app = uri.split('=')[1]
            elif re.match("_", uri):
                app = ""
            else:
                params[uri.split('=')[0]] = uri.split('=')[1]

        hosts.append(confNDNHost(name, app, params, cpu, cores, cache))

    return hosts

def parse_links(conf_arq):
    'Parse links section from the conf file.'
    arq = open(conf_arq,'r')

    links = []

    while True:
        line = arq.readline()
        if line == '[links]\n':
            break

    while True:
        line = arq.readline()
        if line == '':
            break

        args = line.split()

        #checks for non-empty line
        if len(args) == 0:
            continue

        h1, h2 = args.pop(0).split(':')

        link_dict = {}

        for arg in args:
            arg_name, arg_value = arg.split('=')
            key = arg_name
            value = arg_value
            if key in ['bw','jitter','max_queue_size']:
                value = int(value)
            if key in ['loss']:
                value = float(value)
            link_dict[key] = value

        links.append(confNDNLink(h1,h2,link_dict))


    return links