#!/usr/bin/env python3.4
# -*- coding: utf-8 -*-
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
 #the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


import os
import sys
import subprocess
import time
import shutil
import plugins.utils.git

title = "Sync plugin for Git repositories"
version = "0.1.2"

def accepts(source):
    """ Do we accept this source? """
    if source['type'] == 'git':
        return True
    # There are cases where we have a github repo, but don't wanna annalyze the code, just issues
    if source['type'] == 'github' and source.get('issuesonly', False) == False:
        return True
    return False
    
def scan(KibbletBit, source):
    
    # Get some vars, construct a data path for the repo
    path = source['sourceID']
    url = source['sourceURL']
    rootpath = "%s/%s/git" % (KibbletBit.config['scanner']['scratchdir'], source['organisation'])
    
    # If the root path does not exist, try to make it recursively.
    if not os.path.exists(rootpath):
        try:
            os.makedirs(rootpath, exist_ok = True)
            print("Created root path %s" % rootpath)
        except Exception as err:
            source['steps']['sync'] = {
                'time': time.time(),
                'status': 'Could not create root scratch dir - permision denied?',
                'running': False,
                'good': False
            }
            KibbletBit.updateSource(source)
            return
    
    # This is were the repo should be cloned
    datapath = os.path.join(rootpath, path)
    
    KibbletBit.pprint("Checking out %s as %s" % (url, path))

    try:
        source['steps']['sync'] = {
            'time': time.time(),
            'status': 'Fetching code data from source location...',
            'running': True,
            'good': True
        }
        KibbletBit.updateSource(source)
        
        # If we already checked this out earlier, just sync it.
        if os.path.exists(datapath):
            KibbletBit.pprint("Repo %s exists, fetching changes..." % datapath)
            
            # Do we have a default branch here?
            branch = plugins.utils.git.defaultBranch(source, datapath)
            if len(branch) == 0:
                source['default_branch'] = branch
                source['steps']['sync'] = {
                    'time': time.time(),
                    'status': "Could not sync with source",
                    'exception': "No default branch was found in this repository",
                    'running': False,
                    'good': False
                }
                KibbletBit.updateSource(source)
                KibbletBit.pprint("No default branch found for %s (%s)" % (source['sourceID'], source['sourceURL']))
                return

            KibbletBit.pprint("Using branch %s" % branch)
            # Try twice checking out the main branch and fetching changes.
            # Sometimes we need to clean up after older scanners, which is
            # why we try twice. If first attempt fails, clean up and try again.
            for n in range(0,2):
                try:
                    subprocess.check_output("GIT_TERMINAL_PROMPT=0 cd %s && git checkout %s && git fetch --all && git merge -X theirs --no-edit" % (datapath, branch), shell = True, stderr=subprocess.STDOUT)
                    break
                except subprocess.CalledProcessError as err:
                    e = str(err.output).lower()
                    # We're interested in merge conflicts, which we can resolve through trickery.
                    if n > 0 or not ('resolve' in e or 'merge' in e):
                        # This isn't a merge conflict, pass it to outer func
                        raise err
                    else:
                        # Switch to first commit
                        fcommit = subprocess.check_output("cd %s && git rev-list --max-parents=0 --abbrev-commit HEAD" % datapath, shell = True, stderr=subprocess.STDOUT)
                        fcommit = fcommit.decode('ascii').strip()
                        subprocess.check_call("cd %s && git reset --hard %s" % (datapath, fcommit), shell = True, stderr=subprocess.STDOUT)
                        try:
                            subprocess.check_call("cd %s && git clean -xfd" % datpath, shell = True, stderr=subprocess.STDOUT)
                        except:
                            pass
        # This is a new repo, clone it!
        else:
            KibbletBit.pprint("%s is new, cloning...!" % datapath)
            subprocess.check_output("GIT_TERMINAL_PROMPT=0 cd %s && git clone %s %s" % (rootpath, url, path), shell = True, stderr=subprocess.STDOUT)

    except subprocess.CalledProcessError as err:
        KibbletBit.pprint("Repository sync failed (no master?)")
        KibbletBit.pprint(str(err.output))
        source['steps']['sync'] = {
            'time': time.time(),
            'status': 'Sync failed at ' + time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime()),
            'running': False,
            'good': False,
            'exception': str(err.output)
        }
        KibbletBit.updateSource(source)
        return
    
    # All good, yay!
    source['steps']['sync'] = {
            'time': time.time(),
            'status': 'Source code fetched successfully at ' + time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime()),
            'running': False,
            'good': True
        }
    KibbletBit.updateSource(source)