#!/usr/bin/env python3.5

# You are free to use and/or change this code for
# your own needs.

# Original code (c)2018 Jan Lerking
# Program to convert C-header (*.h) files to nasm include files (*.inc),
# for direct usage in assembly programming using nasm/yasm.

import os
import sys
import multiprocessing as mp
import io
from h2inc_parser import parseline, parseparsed
import h2inc_gui

tupline = []
preproc = ()
filelist = []
folderlist = []
cnt = 0
sourcedir = ''
destdir = ''
num_cores = mp.cpu_count()

def sourcedir_filecnt(sourcedir):
    ### Return the number of files, ending with '.h', in sourcedir - including subdirectories ###
    cnt = 0
    global filelist
    for folderName, subfolders, files in os.walk(sourcedir):
        for file in files:
            if file.lower().endswith('.h'):
                cnt += 1
                filelist += [folderName+'/'+file]
                print(folderName+'/'+file)
    #print(filelist)
    return cnt
                
def sourcedir_foldercnt(sourcedir):
    ### Return the number of folders, if it contains '*.h' files, in sourcedir - including subdirectories ###
    global cnt
    global folderlist
    for folderName, subfolders, files in os.walk(sourcedir):
        if subfolders:
            for subfolder in subfolders:
                sourcedir_foldercnt(subfolder)
        tempf = [file for file in files if file.lower().endswith('.h')]
        if tempf:
            cnt = cnt+1
            #print(folderName)
            folderlist += [folderName]
    #print(folderlist)
    #print(len(folderlist))
    return cnt

def process_files(gui, source, dest):
    global sourcedir
    global destdir
    sourcedir = source
    destdir = dest
    pool = mp.Pool(processes=num_cores)
    pool.map(process_file, filelist)

def process_file(data):
    outfile = ''
    inputfile = data
    encodings = ['utf-8', 'latin-1', 'windows-1250', 'windows-1252', 'ascii',
                'big5', 'big5hkscs', 'cp037', 'cp273', 'cp424', 'cp437', 'cp500',
                'cp720', 'cp737', 'cp775', 'cp850', 'cp852', 'cp855', 'cp856',
                'cp857', 'cp858', 'cp860', 'cp861', 'cp862', 'cp863', 'cp864', 'cp865',
                'cp866', 'cp869', 'cp874', 'cp875', 'cp932', 'cp949', 'cp950', 'cp1006',
                'cp1026', 'cp1125', 'cp1140', 'cp1250', 'cp1251', 'cp1252', 'cp1253', 'cp1254',
                'cp1255', 'cp1256', 'cp1257', 'cp1258', 'cp65001', 'euc-jp', 'euc-jis-2004',
                'euc-jisx0213', 'euc-kr', 'gb2312', 'gbk', 'gb18030', 'hz', 'iso2022-jp',
                'iso2022-jp-1', 'iso2022-jp-2', 'iso2022-jp-2004', 'iso2022-jp-3',
                'iso2022-jp-ext', 'iso2022-kr', 'iso8859-2', 'iso8859-3', 'iso8859-4',
                'iso8859-5', 'iso8859-6', 'iso8859-7', 'iso8859-8', 'iso8859-9', 'iso8859-10',
                'iso8859-11', 'iso8859-13', 'iso8859-14', 'iso8859-15', 'iso8859-16', 'johab',
                'koi8-r', 'koi8-t', 'koi8-u', 'kz1048', 'mac-cyrillic', 'mac-greek',
                'mac-iceland', 'mac-latin2', 'mac-roman', 'mac-turkish', 'ptcp154',
                'shift-jis', 'shift-jis-2004', 'shift-jisx0213', 'utf-32', 'utf-32-be',
                'utf-32-le', 'utf-16', 'utf-16-be', 'utf-16-le', 'utf-7', 'utf-8-sig']
    for e in encodings:
        try:
            fh = io.open(data, 'r', encoding=e)
            fh.readlines()
            fh.seek(0)
        except UnicodeDecodeError:
            print('got unicode error with %s , trying different encoding' % e)
        else:
            #print('opening the file with encoding:  %s ' % e)
            break 
    #print(os.path.basename(data))
    for lines in fh:
        outfile = outfile+lines
    fh.close()
    outputfile = os.path.splitext(inputfile)[0]+'.inc'
    outputfile = str(outputfile).replace(sourcedir, destdir)
    #print(outputfile)
    if not os.path.exists(os.path.dirname(outputfile)):
        try:  
            os.makedirs(os.path.dirname(outputfile))
        except OSError as exc: # Guard against race condition
            if exc.errno != errno.EEXIST:
                raise
    newfile = open(outputfile, "w")
    newfile.write(outfile)
    newfile.close()
    
def async_process(num):
    pool = mp.Pool(processes=num)
    pool.map(process_file, filelist)