import os, time
import libxml2
import pdb

from globals import *
from pretty import Pretty
from sfatables.command import Command

class List(Command):
    options = [('-L','--list')]
    help = 'List a chain'
    key='list_rule'
    matches = False
    targets = False

    def __init__(self):
        return


    def get_info(self, xmlextension_path):
        xmldoc = libxml2.parseFile(xmlextension_path)
        p = xmldoc.xpathNewContext()
        
        ext_name_node = p.xpathEval("/match/@name")
        ext_name = ext_name_node[0].content

        name_nodes = p.xpathEval("//rule/argument[value!='']/name")
        value_nodes = p.xpathEval("//rule/argument[value!='']/value")

        names = [n.content for n in name_nodes]
        values = [v.content for v in value_nodes]

        name_values = zip(names,values)
        name_value_pairs = map(lambda (n,v):n+'='+v, name_values)

        argument_str = ",".join(name_value_pairs)

        p.xpathFreeContext()
        xmldoc.freeDoc()

        return {'name':ext_name, 'arguments':'argument_str'}

    def call(self, command_options, match_options, target_options):
        chain = command_options.args[0]
        chain_dir = sfatables_config + "/" + chain
        rule_list = []
        broken_semantics = os.walk(chain_dir)
        for (root, dirs, files) in broken_semantics:
            for file in files:
                if (file.startswith('sfatables')):
                    (magic,number,type) = file.split('-')
                    rule_list.append(int(number))

        rule_list.sort()

        pretty = Pretty(['Rule','Match','Target','Arguments'])

        for number in rule_list:
            match_file = "sfatables-%d-%s"%(number,'match')
            target_file = "sfatables-%d-%s"%(number,'target')

            match_path = sfatables_config + '/' + chain + '/' + match_file
            target_path = sfatables_config + '/' + chain + '/' + target_file
            
            match_info = self.get_info (match_path)
            target_info = self.get_info (target_path)

            pretty.push_row(["%d"%number,  match_info['name'], match_info['arguments'], target_info['arguments']])
        
        
        pretty.pprint()