import sys

import os

from os import listdir

from os.path import isdir

import csv

def check_argv(name):

	if not os.path.exists(name):

		print name,' doesn\'t exist.'

		return False

	if not os.path.isdir(name):

		print name,' is not a dir.'

		return False

	file_list = os.listdir(name)

	properDir = False

	for current_file in file_list:

		if current_file.endswith('.csv'):

			properDir =True

			break

	if not properDir:

		print name,' is not a LET log dir'

		return False

	return True

def find_logfile(name):

	file_list = os.listdir(name)

	for current_file in file_list:

		if current_file.endswith('.csv'):

			return name+'\\'+current_file	

	return None

def get_result_map(csvfile):

	map = {}

	file = open(csvfile,"r")

	lines = csv.reader(file)

	skip_file_line = True

	for line in lines:

		if skip_file_line:

			skip_file_line=False

		else:

			case_name = line[0]

			test_result = line[3]

			if map.has_key(case_name):

				print 'Duplicate casename:',case_name,' ignored'

			else:

				map[case_name] = test_result

	return map

def diff_result(map_old, map_new):

	keys_new = map_new.keys()

	for key_new in keys_new:

		item_new = map_new[key_new]

		value_new = item_new

		if map_old.has_key(key_new):

			value_old = map_old[key_new]

			if not value_old == value_new:

				print 'CHANGE:',key_new,value_old,'-->',value_new

		else:

			print 'ADD:',key_new,value_new

	keys_old = map_old.keys()

	for key_old in map_old:

		item_old = map_old[key_old]

		value_old = item_old

		if not map_new.has_key(key_old):

			print 'REMOVE:',key_old,value_old

if __name__ == '__main__':

	argv = sys.argv[1:]

	if len(argv)<2:

		print 'usage: logdiff base_log_dir derived_log_dir'

	else :

		old_file = argv[0]

		new_file = argv[1]

		if check_argv(old_file) and check_argv(new_file):

			new_map = get_result_map(find_logfile(new_file))

			old_map = get_result_map(find_logfile(old_file))

			diff_result(old_map,new_map)