import argparse
import os
import sys


# Directories to exclude from blob
excludedDirs = { "projects", "doc", "extern", "math_v2", "stl" }


def filterDirs(dirs):
    """ Remove directories present in the exclusion list
    """
    newDirs = list( set(dirs) - excludedDirs)
    newDirs.sort()
    return newDirs


def filterFilesOnExtension(files, ext):
    """ Filter files based on their extension
    """
    def filterPredicate(filename):
        fExt = filename[filename.find('.')+1:]
        return fExt != None and fExt.lower() == ext.lower()

    return filter( filterPredicate, files )


def filterFilesOnContent(files):
    skipSPUTag = '@skipspu'

    basePath = os.getcwd() + '/'

    """  Filter the file based on whether its first line contains skipSPUTag or not.
    """
    def filterPredicate(filename):
        with open(basePath + filename, 'r') as file:
            firstLine = file.readline()
            tagLocation = firstLine.lower().find(skipSPUTag)
            tagFound = tagLocation != -1

            if tagFound:
                detail = firstLine[tagLocation + len(skipSPUTag):].strip()

                print 'Skipping the file "%s". Detail: "%s"' % (filename, detail if len(detail) > 0 else 'None given')

            return not tagFound

        return True

    return filter( filterPredicate, files )


def findAllFiles(root, ext):
    """Example findAllFiles('../../gear_core','cpp')
        will find all .cpp in gear_core
    """
    # Root has to be excluded
    satelliteDirName, subdirs, rootFiles = os.walk(root).next()
    subdirs = filterDirs(subdirs)
    allFiles = []

    for subdir in subdirs:
        for dirname, dirs, files in os.walk( os.path.join( root, subdir ) ):
            if os.path.split(dirname)[1] in excludedDirs:
                continue

            fixedDirName = dirname.replace('\\','/')

            files = filterFilesOnExtension(files, ext)
            allFiles += map( lambda f: fixedDirName + '/' + f, files )

    allFiles = filterFilesOnContent(allFiles)

    return allFiles