#! /usr/bin/env python3

import sys
import os
import shutil
import re

#############################################################
# GetSdkRevision
#############################################################
def GetSdkRevision():
    cmd = 'git status --porcelain -b'
    lines = os.popen(cmd).readlines()
    if not lines[0].startswith('## master'):
        print('ERROR: not on master branch')
        return None
    if len(lines) > 1:
        print('ERROR: git status not empty')
        print(''.join(lines))
        return None

    cmd = 'git tag --contains HEAD'
    tags = os.popen(cmd).readlines()
    if len(tags) != 1:
        print('ERROR: expected exactly one tag for HEAD, found', len(tags), ':', tags)
        return None
    version = tags[0].strip()
    sep = version.find('-')
    if sep < 0:
        print('ERROR: unrecognized version string format:', version)
    return version[sep+1:]

#############################################################
# GetVersion
#############################################################
def GetVersion():
    f = open(BENTO4_HOME+'/Source/C++/Core/Ap4Version.h')
    lines = f.readlines()
    f.close()
    for line in lines:
        m = re.match(r'.*AP4_VERSION_STRING *"([0-9]*)\.([0-9]*)\.([0-9]*).*"', line)
        if m:
            return m.group(1) + '-' + m.group(2) + '-' + m.group(3)
    return '0-0-0'

#############################################################
# Main
#############################################################
script_dir  = os.path.abspath(os.path.dirname(__file__))
BENTO4_HOME = os.path.join(script_dir,'..')
BENTO4_VERSION = GetVersion()

SDK_REVISION = GetSdkRevision()
if SDK_REVISION is None:
    sys.exit(1)
print("Exporting Revision", SDK_REVISION)

# compute paths
SDK_NAME='Bento4-SRC-'+BENTO4_VERSION+'-'+SDK_REVISION
SDK_OUTPUT_ROOT=BENTO4_HOME+'/SDK'
SDK_ROOT=SDK_OUTPUT_ROOT+'/'+SDK_NAME

print(SDK_NAME)

# remove any previous SDK directory
if os.path.exists(SDK_ROOT):
    shutil.rmtree(SDK_ROOT)

# ensure that the output dir exists
if not os.path.exists(SDK_OUTPUT_ROOT):
    os.makedirs(SDK_OUTPUT_ROOT)

### export
cmd = 'git archive --format=zip HEAD -o '+SDK_ROOT+'.zip'
print(cmd)
#cmd = 'svn export -r'+SDK_REVISION+' https://zebulon.bok.net/svn/Bento4/trunk '+SDK_NAME
os.system(cmd)