#! /bin/python
# $Id
# -----------------------------------------------------------------------------
# CppAD: C++ Algorithmic Differentiation: Copyright (C) 2003-17 Bradley M. Bell
# CppAD is distributed under the terms of the
#              Eclipse Public License Version 2.0.
#
# This Source Code may also be made available under the following
# Secondary License when the conditions for such availability set forth
# in the Eclipse Public License, Version 2.0 are satisfied:
#       GNU General Public License, Version 2.0 or later.
# -----------------------------------------------------------------------------
from __future__ import print_function
# -----------------------------------------------------------------------------
# imports
import sys
import os
import re
import subprocess
import pdb
# -----------------------------------------------------------------------------
# command line arguments
usage = '\tbin/push_git2svn.py svn_branch_path\n'
narg  = len(sys.argv)
if sys.argv[0] != 'bin/push_git2svn.py' :
    msg = 'bin/push_git2svn.py must be executed from its parent directory'
    sys.exit(usage + msg)
if narg != 2 :
    msg = 'expected 1 but found ' + str(narg-1) + ' command line arguments'
    sys.exit(usage + msg)
svn_branch_path = sys.argv[1]
if svn_branch_path == 'master' :
    msg = 'trunk is the svn_branch_path for the master branch'
    sys.exit(usage + msg)
# -----------------------------------------------------------------------------
# some settings
svn_repository = 'https://projects.coin-or.org/svn/CppAD'
git_repository = 'https://github.com/coin-or/CppAD'
work_directory = 'build'
# -----------------------------------------------------------------------------
# some simple functions
def pause(question, choice_list) :
    response=''
    while not response in choice_list :
        print(question, end='')
        response = sys.stdin.readline()
        if response.endswith('\n') :
            response = response[:-1]
    return response
#
def system(cmd) :
    try :
        output = subprocess.check_output(
            cmd,
            stderr=subprocess.STDOUT,
            shell=True
        )
    except subprocess.CalledProcessError as info :
        msg  = info.output
        msg += '\nbin/push_git2svn.py exiting because command above failed'
        sys.exit(cmd + '\n\n' + msg)
    return output
def print_system(cmd) :
    print(cmd)
    try :
        output = subprocess.check_output(
            cmd,
            stderr=subprocess.STDOUT,
            shell=True
        )
    except subprocess.CalledProcessError as info :
        msg  = info.output
        msg += '\nbin/push_git2svn.py exiting because command above failed'
        sys.exit(msg)
    return output
def ignore_data(data) :
    id_pattern  = re.compile(r'^.*\$Id.*$',      re.MULTILINE)
    data        = re.sub(id_pattern,    '', data)
    return data
# -----------------------------------------------------------------------------
# determine git_branch_name
if svn_branch_path == 'trunk' :
    git_branch_name = 'master'
    git_branch_path = svn_branch_path
elif svn_branch_path.startswith('branches/') :
    git_branch_name = svn_branch_path[len('branches/'):]
    git_branch_path = svn_branch_path
else :
    git_branch_name = svn_branch_path
    git_branch_path = 'branches/' + svn_branch_path
# -----------------------------------------------------------------------------
# hash code for the git branch
cmd = 'git show-ref origin/' + git_branch_name
git_hash_code = system(cmd)
pattern       = ' refs/remotes/origin/' + git_branch_name
git_hash_code = git_hash_code.replace(pattern, '')
# -----------------------------------------------------------------------------
# make sure work directory exists
if not os.path.isdir(work_directory) :
    os.makedirs(work_directory)
# -----------------------------------------------------------------------------
# checkout svn version of directory
svn_directory = work_directory + '/svn'
if os.path.isdir(svn_directory) :
    cmd         = 'rm -rf ' + svn_directory
    print_system(cmd)
cmd  = 'svn checkout '
cmd +=  svn_repository + '/' + svn_branch_path + ' ' + svn_directory
print_system(cmd)
# ----------------------------------------------------------------------------
# git hash code corresponding to verison in svn directory
cmd           = 'svn info ' + svn_directory
svn_info      = system(cmd)
rev_pattern   = re.compile('Last Changed Rev: *([0-9]+)')
match         = re.search(rev_pattern, svn_info)
svn_revision  = match.group(1)
cmd           = 'svn log -r ' + svn_revision + ' ' + svn_directory
svn_log       = system(cmd)
hash_pattern  = re.compile('\nend   hash code: *([0-9a-f]+)')
match         = re.search(hash_pattern, svn_log)
if match :
    svn_hash_code = match.group(1)
else :
    svn_hash_code = None
# -----------------------------------------------------------------------------
# export the git verison of the directory
git_directory = work_directory + '/git'
if os.path.isdir(git_directory) :
    cmd = 'rm -rf ' + git_directory
    print_system(cmd)
cmd  = 'svn export '
cmd +=  git_repository + '/' + git_branch_path + ' ' + git_directory
print_system(cmd)
# -----------------------------------------------------------------------------
# list of files for the svn and git directories
svn_pattern = re.compile(svn_directory + '/')
svn_file_list = []
svn_dir_list  = []
for directory, dir_list, file_list in os.walk(svn_directory) :
    ok = ( directory.find('/.svn/') == -1 )
    ok = ok and ( not directory.endswith('/.svn') )
    if ok :
        if directory != svn_directory :
            local_name = re.sub(svn_pattern, '', directory)
            svn_dir_list.append(local_name)
        for name in file_list :
            local_name = directory + '/' + name
            local_name = re.sub(svn_pattern, '', local_name)
            svn_file_list.append( local_name )
#
git_pattern = re.compile(git_directory + '/')
git_file_list = []
git_dir_list  = []
for directory, dir_list, file_list in os.walk(git_directory) :
    index =  directory.find('/.svn/')
    assert index == -1
    if directory != git_directory :
        local_name = re.sub(git_pattern, '', directory)
        git_dir_list.append(local_name)
    for name in file_list :
        local_name = directory + '/' + name
        local_name = re.sub(git_pattern, '', local_name)
        git_file_list.append( local_name )
# -----------------------------------------------------------------------------
# list of files that have been created and deleted
created_file_list=[]
for name in git_file_list :
    if not name in svn_file_list :
        created_file_list.append(name)
#
deleted_file_list=[]
for name in svn_file_list :
    if not name in git_file_list :
        deleted_file_list.append(name)
# -----------------------------------------------------------------------------
# list of directories that have been created and deleted
created_dir_list=[]
for name in git_dir_list :
    if not name in svn_dir_list :
        created_dir_list.append(name)
#
deleted_dir_list=[]
for name in svn_dir_list :
    if not name in git_dir_list :
        deleted_dir_list.append(name)
# -----------------------------------------------------------------------------
# automated svn commands
#
for git_dir in created_dir_list :
    cmd  = 'svn mkdir ' + svn_directory + '/' + git_dir
    print_system(cmd)
#
for git_file in created_file_list :
    # the original file that was copied to the git_file
    original_file = None
    #
    # extract the directory that git_file is located in
    pattern    = re.compile(r'.*/([^/]*)')
    git_local  = re.sub(pattern, r'\1', git_file)
    #
    for svn_file in deleted_file_list :
        svn_local = re.sub(pattern, r'\1', svn_file)
        if svn_local == git_local :
            original_file = svn_file
    #
    git_f     = open(git_directory + '/' + git_file, 'rb')
    git_data  = git_f.read()
    git_f.close()
    git_data  = ignore_data(git_data)
    #
    for svn_file in deleted_file_list :
        svn_f    = open(svn_directory + '/' + svn_file, 'rb')
        svn_data = svn_f.read()
        svn_f.close()
        svn_data = ignore_data(svn_data)
        #
        if svn_data == git_data :
            original_file = svn_file
    if original_file == None :
            cmd  = 'cp ' + git_directory + '/' + git_file + ' \\\n\t'
            cmd += svn_directory + '/' + git_file
            system(cmd)
            cmd  = 'svn add ' + svn_directory + '/' + git_file
            print_system(cmd)
    else :
            # remove original file from deleted file list
            ind  = deleted_file_list.index( original_file )
            del deleted_file_list[ind]
            # copy original file to new file name
            cmd  = 'svn move ' + svn_directory + '/' + original_file + ' \\\n\t'
            cmd += svn_directory + '/' + git_file
            print_system(cmd)
            # replace by the git version for this file
            cmd  = 'cp ' + git_directory + '/' + git_file + ' \\\n\t'
            cmd += svn_directory + '/' + git_file
            system(cmd)
            found = True
#
for svn_file in deleted_file_list :
    svn_file_path = svn_directory + '/' + svn_file
    if os.path.isfile(svn_file_path) :
        cmd = 'svn delete --force ' + svn_file_path
        print_system(cmd)
#
for git_file in git_file_list :
    do_cp = True
    do_cp = do_cp and git_file not in created_file_list
    if git_file in svn_file_list :
        git_f     = open(git_directory + '/' + git_file, 'rb')
        git_data  = git_f.read()
        git_f.close()
        git_data  = ignore_data(git_data)
        #
        svn_f    = open(svn_directory + '/' + git_file, 'rb')
        svn_data = svn_f.read()
        svn_f.close()
        svn_data = ignore_data(svn_data)
        #
        do_cp = do_cp and git_data != svn_data
    if do_cp :
        cmd  = 'cp ' + git_directory + '/' + git_file + ' \\\n\t'
        cmd += svn_directory + '/' + git_file
        system(cmd)
#
for svn_dir in deleted_dir_list :
    cmd  = 'svn rm ' + svn_directory + '/' + svn_dir
    print_system(cmd)
# -----------------------------------------------------------------------------
data  = 'merge to branch: ' + svn_branch_path + '\n'
data += 'from repository: ' + git_repository + '\n'
if svn_hash_code != None :
    data += 'start hash code: ' + svn_hash_code + '\n'
else :
    data += 'start hash code: missing\n'
data   += 'end   hash code: ' + git_hash_code + '\n\n'
if svn_hash_code != None :
    sed_cmd = "sed -e '/" + svn_hash_code + "/,$d'"
    cmd     = 'git log origin/' + git_branch_name + ' | ' + sed_cmd
    output = system(cmd)
    data  += output
log_f  = open( svn_directory + '/push_git2svn.log' , 'wb')
log_f.write(data)
log_f.close()
#
msg  = '\nChange into svn directory with the command\n\t'
msg += 'cd ' + svn_directory + '\n'
msg += 'If these changes are OK, execute the command:\n\t'
msg += 'svn commit --file push_git2svn.log\n'
if svn_hash_code != None :
    msg += 'You should inspect and possibly edit push_git2svn.log'
else :
    msg += 'The start hash code could not be automatically determined.\n'
    msg += 'You should edit push_git2svn.log to describe the changes.'
print(msg)