#!/usr/bin/env python3
import sys
import os
import re
from os import listdir
from os.path import isfile, join


# argv[1] - moin root directory
# argv[2] - output directory

if len(sys.argv) < 3:
	print("Argument missing. Usage: python3 moin_export.py <moin dir> <export dir>" )
else:
	if os.path.exists(sys.argv[1]):
		filesdir = sys.argv[1] + "/wiki/data/pages"
		for file in listdir(filesdir):
			loc = filesdir + "/" + file + "/revisions"
			try:
				files = [ f for f in listdir(loc) if isfile(join(loc,f)) ]
				latest_file = sorted(files,reverse=True)[0] # highest number
				f = open(join(loc,latest_file), 'r', encoding="utf-8")
				contents = f.read()
				output_loc = sys.argv[2] #todo: validation  

				if not os.path.exists(output_loc):
					os.makedirs(output_loc)

				new_name = file
				characters = re.findall("(\([0-9a-f]{2,}\))", file)
				characters = list(set(characters)) #remove duplicates
				for character in characters:
					code = character[1:-1]
					utf =  bytes.fromhex(code).decode('utf-8')
					new_name = new_name.replace(character, utf)
					
				output_filename = output_loc + "/" + new_name + ".txt" 
				fo = open(output_filename, "wb")
				fo.write(contents.encode("utf-8"))
				fo.close()
				f.close()
			except FileNotFoundError:
				print("Directory " + file + " is empty.")
			except IOError:
				print("File " + latest_file + " does not exist.")
	else:
		print("Error: invalid Moin directory path")