#!/usr/bin/env python3
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#

import sys, os.path, getopt
from msodumper import ole, pptstream, globals, olestream
from msodumper.globals import error

def usage (exname):
    exname = os.path.basename(exname)
    msg = """Usage: %s [options] [ppt file]

Options:
  --help        displays this help message.
  --no-struct-output suppress normal structure analysis output
  --dump-text   extract and print the textual content
  --no-raw-dumps suppress raw hex dumps of uninterpreted areas
  --id-select=id1[,id2 ...] limit output to selected record Ids
""" % exname
    print(msg)


class PPTDumper(object):

    def __init__ (self, filepath, params):
        self.filepath = filepath
        self.params = params

    def __printDirHeader (self, dirname, byteLen):
        dirname = globals.encodeName(dirname)
        globals.outputln("")
        globals.outputln("="*68)
        globals.outputln("%s (size: %d bytes)"%(dirname, byteLen))
        globals.outputln("-"*68)

    def dump (self):
        file = open(self.filepath, 'rb')
        strm = pptstream.PPTFile(file.read(), self.params)
        file.close()
        strm.printStreamInfo()
        strm.printHeader()
        strm.printDirectory()
        dirnames = strm.getDirectoryNames()
        result = True
        for dirname in dirnames:
            sdirname = globals.nulltrunc(dirname)
            if len(sdirname) == 0 or sdirname == b"Root Entry":
                continue

            try:
                dirstrm = strm.getDirectoryStreamByName(dirname)
            except Exception as err:
                error("getDirectoryStreamByName(%s): %s\n" % (dirname,str(err)))
                # The previous version was killed by the exception
                # here, so the equivalent is to break, but maybe there
                # is no reason to do so.
                break
            self.__printDirHeader(dirname, len(dirstrm.bytes))
            if  sdirname == b"PowerPoint Document":
                if not self.__readSubStream(dirstrm):
                    result = False
            elif  sdirname == b"Current User":
                if not self.__readSubStream(dirstrm):
                    result = False
            elif  sdirname == b"\x05DocumentSummaryInformation":
                strm = olestream.PropertySetStream(dirstrm.bytes)
                strm.read()
            else:
                globals.dumpBytes(dirstrm.bytes, 512)
        return result

    def __readSubStream (self, strm):
        # read all records in substream
        return strm.readRecords()


def main (args):
    exname, args = args[0], args[1:]
    if len(args) < 1:
        print("takes at least one argument")
        usage(exname)
        return

    try:
        opts, args = getopt.getopt(args, "h",
                                   ["help", "debug", "show-sector-chain",
                                    "no-struct-output", "dump-text",
                                    "id-select=", "no-raw-dumps"])
        for opt, arg in opts:
            if opt in ['-h', '--help']:
                usage(exname)
                return
            elif opt in ['--debug']:
                globals.params.debug = True
            elif opt in ['--show-sector-chain']:
                globals.params.showSectorChain = True
            elif opt in ['--no-struct-output']:
                globals.params.noStructOutput = True
            elif opt in ['--dump-text']:
                globals.params.dumpText = True
            elif opt in ['--no-raw-dumps']:
                globals.params.noRawDumps = True
            elif opt in ['--id-select']:
                globals.params.dumpedIds = arg.split(",")
                globals.params.dumpedIds = \
                    set([int(val) for val in globals.params.dumpedIds if val])
            else:
                error("unknown option %s\n"%opt)
                usage()

    except getopt.GetoptError:
        error("error parsing input options\n")
        usage(exname)
        return

    dumper = PPTDumper(args[0], globals.params)
    if not dumper.dump():
        error("FAILURE\n")
    if globals.params.dumpText:
        globals.dumptext()

if __name__ == '__main__':
    main(sys.argv)

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