# -*- coding: utf-8 -*-

"""

 (c) 2015 - Copyright Red Hat Inc

 Authors:

   Pierre-Yves Chibon <pingou@pingoured.fr></pingou@pingoured.fr>

"""

import datetime

import hashlib

import json

import os

import random

import shutil

import string

import tempfile

import time

import uuid

import pygit2

import werkzeug

import progit

import progit.exceptions

import progit.lib

import progit.lib.notify

from progit.lib import model

def commit_to_patch(repo_obj, commits):

    ''' For a given commit (PyGit2 commit object) of a specified git repo,

    returns a string representation of the changes the commit did in a

    format that allows it to be used as patch.

    '''

    if not isinstance(commits, list):

        commits = [commits]

    patch = ""

    for cnt, commit in enumerate(commits):

        if commit.parents:

            diff = commit.tree.diff_to_tree()

            parent = repo_obj.revparse_single('%s^' % commit.oid.hex)

            diff = repo_obj.diff(parent, commit)

        else:

            # First commit in the repo

            diff = commit.tree.diff_to_tree(swap=True)

        subject = message = ''

        if '\n' in commit.message:

            subject, message = commit.message.split('\n', 1)

        else:

            subject = commit.message

        if len(commits) > 1:

            subject = '[PATCH %s/%s] %s' % (cnt + 1, len(commits), subject)

        patch += """From %(commit)s Mon Sep 17 00:00:00 2001

From: %(author_name)s <%(author_email)s>

Date: %(date)s

Subject: %(subject)s

%(msg)s

---

%(patch)s

""" % (

            {

                'commit': commit.oid.hex,

                'author_name': commit.author.name,

                'author_email': commit.author.email,

                'date': datetime.datetime.utcfromtimestamp(

                    commit.commit_time).strftime('%b %d %Y %H:%M:%S +0000'),

                'subject': subject,

                'msg': message,

                'patch': diff.patch,

            }

        )

    return patch

def write_gitolite_acls(session, configfile):

    ''' Generate the configuration file for gitolite for all projects

    on the forge.

    '''

    config = []

    for project in session.query(model.Project).all():

        if project.parent_id:

            config.append('repo forks/%s' % project.fullname)

        else:

            config.append('repo %s' % project.fullname)

        config.append('  R   = @all')

        config.append('  RW+ = %s' % project.user.user)

        for user in project.users:

            if user != project.user:

                config.append('  RW+ = %s' % user.user)

        config.append('')

        config.append('repo docs/%s' % project.fullname)

        config.append('  R   = @all')

        config.append('  RW+ = %s' % project.user.user)

        for user in project.users:

            if user != project.user:

                config.append('  RW+ = %s' % user.user)

        config.append('')

        config.append('repo tickets/%s' % project.fullname)

        config.append('  R   = @all')

        config.append('  RW+ = %s' % project.user.user)

        for user in project.users:

            if user != project.user:

                config.append('  RW+ = %s' % user.user)

        config.append('')

    with open(configfile, 'w') as stream:

        for row in config:

            stream.write(row + '\n')

def update_git(obj, repo, repofolder, objtype='ticket'):

    """ Update the given issue in its git.

    This method forks the provided repo, add/edit the issue whose file name

    is defined by the uid field of the issue and if there are additions/

    changes commit them and push them back to the original repo.

    """

    if not repofolder:

        return

    # Get the fork

    repopath = os.path.join(repofolder, repo.path)

    ticket_repo = pygit2.Repository(repopath)

    # Clone the repo into a temp folder

    newpath = tempfile.mkdtemp()

    new_repo = pygit2.clone_repository(repopath, newpath)

    file_path = os.path.join(newpath, obj.uid)

    # Get the current index

    index = new_repo.index

    # Are we adding files

    added = False

    if not os.path.exists(file_path):

        added = True

    # Write down what changed

    with open(file_path, 'w') as stream:

        stream.write(obj.to_json())

    # Retrieve the list of files that changed

    diff = new_repo.diff()

    files = [patch.new_file_path for patch in diff]

    # Add the changes to the index

    if added:

        index.add(obj.uid)

    for filename in files:

        index.add(filename)

    # If not change, return

    if not files and not added:

        shutil.rmtree(newpath)

        return

    # See if there is a parent to this commit

    parent = None

    try:

        parent = new_repo.head.get_object().oid

    except pygit2.GitError:

        pass

    parents = []

    if parent:

        parents.append(parent)

    # Author/commiter will always be this one

    author = pygit2.Signature(name='progit', email='progit')

    # Actually commit

    sha = new_repo.create_commit(

        'refs/heads/master',

        author,

        author,

        'Updated %s %s: %s' % (objtype, obj.uid, obj.title),

        new_repo.index.write_tree(),

        parents)

    index.write()

    # Push to origin

    ori_remote = new_repo.remotes[0]

    master_ref = new_repo.lookup_reference('HEAD').resolve()

    refname = '%s:%s' % (master_ref.name, master_ref.name)

    ori_remote.push(refname)

    # Remove the clone

    shutil.rmtree(newpath)

def get_user_from_json(session, jsondata):

    """ From the given json blob, retrieve the user info and search for it

    in the db and create the user if it does not already exist.

    """

    user = None

    username = jsondata.get('user', {}).get('name')

    fullname = jsondata.get('user', {}).get('fullname')

    useremails = jsondata.get('user', {}).get('emails')

    user = progit.lib.search_user(session, username=username)

    if not user:

        for email in useremails:

            user = progit.lib.search_user(session, email=email)

            if user:

                break

    if not user:

        user = progit.lib.set_up_user(

            session=session,

            username=username,

            fullname=fullname or username,

            user_email=useremails[0],

        )

        session.commit()

    return user

def update_ticket_from_git(

        session, reponame, username, issue_uid, json_data):

    """ Update the specified issue (identified by its unique identifier)

    with the data present in the json blob provided.

    :arg session: the session to connect to the database with.

    :arg repo: the name of the project to update

    :arg issue_uid: the unique identifier of the issue to update

    :arg json_data: the json representation of the issue taken from the git

        and used to update the data in the database.

    """

    print json.dumps(json_data, sort_keys=True,

                     indent=4, separators=(',', ': '))

    repo = progit.lib.get_project(session, reponame, user=username)

    if not repo:

        raise progit.exceptions.ProgitException(

            'Unknown repo %s of username: %s' % (reponame, username))

    user = get_user_from_json(session, json_data)

    issue = progit.lib.get_issue_by_uid(session, issue_uid=issue_uid)

    if not issue:

        # Create new issue

        progit.lib.new_issue(

            session,

            repo=repo,

            title=json_data.get('title'),

            content=json_data.get('content'),

            user=user.username,

            ticketfolder=None,

            issue_id=json_data.get('id'),

            issue_uid=issue_uid,

            private=json_data.get('private'),

            status=json_data.get('status'),

            notify=False,

        )

    else:

        # Edit existing issue

        progit.lib.edit_issue(

            session,

            issue=issue,

            ticketfolder=None,

            title=json_data.get('title'),

            content=json_data.get('content'),

            status=json_data.get('status'),

            private=json_data.get('private'),

        )

    session.commit()

    issue = progit.lib.get_issue_by_uid(session, issue_uid=issue_uid)

    # Update tags

    tags = json_data.get('tags', [])

    progit.lib.update_tags_issue(

        session, issue, tags, username=user.user, ticketfolder=None)

    # Update depends

    depends = json_data.get('depends', [])

    progit.lib.update_dependency_issue(

        session, issue.project, issue, depends,

        username=user.user, ticketfolder=None)

    # Update blocks

    blocks = json_data.get('blocks', [])

    progit.lib.update_blocked_issue(

        session, issue.project, issue, blocks,

        username=user.user, ticketfolder=None)

    for comment in json_data['comments']:

        user = get_user_from_json(session, comment)

        commentobj = progit.lib.get_issue_comment(

            session, issue_uid, comment['id'])

        if not commentobj:

            progit.lib.add_issue_comment(

                session,

                issue=issue,

                comment=comment['comment'],

                user=user.username,

                ticketfolder=None,

                notify=False,

            )

    session.commit()

def add_file_to_git(repo, issue, ticketfolder, user, filename, filestream):

    ''' Add a given file to the specified ticket git repository.

    :arg repo: the Project object from the database

    :arg ticketfolder: the folder on the filesystem where the git repo for

        tickets are stored

    :arg user: the user object with its username and email

    :arg filename: the name of the file to save

    :arg filestream: the actual content of the file

    '''

    if not ticketfolder:

        return

    # Prefix the filename with a timestamp:

    filename = '%s-%s' % (

        hashlib.sha256(filestream.read()).hexdigest(),

        werkzeug.secure_filename(filename)

    )

    # Get the fork

    repopath = os.path.join(ticketfolder, repo.path)

    ticket_repo = pygit2.Repository(repopath)

    # Clone the repo into a temp folder

    newpath = tempfile.mkdtemp()

    new_repo = pygit2.clone_repository(repopath, newpath)

    folder_path = os.path.join(newpath, 'files')

    file_path = os.path.join(folder_path, filename)

    # Get the current index

    index = new_repo.index

    # Are we adding files

    added = False

    if not os.path.exists(file_path):

        added = True

    else:

        # File exists, remove the clone and return

        shutil.rmtree(newpath)

        return os.path.join('files', filename)

    if not os.path.exists(folder_path):

        os.mkdir(folder_path)

    # Write down what changed

    filestream.seek(0)

    with open(file_path, 'w') as stream:

        stream.write(filestream.read())

    # Retrieve the list of files that changed

    diff = new_repo.diff()

    files = [patch.new_file_path for patch in diff]

    # Add the changes to the index

    if added:

        index.add(os.path.join('files', filename))

    for filename in files:

        index.add(filename)

    # If not change, return

    if not files and not added:

        shutil.rmtree(newpath)

        return

    # See if there is a parent to this commit

    parent = None

    try:

        parent = new_repo.head.get_object().oid

    except pygit2.GitError:

        pass

    parents = []

    if parent:

        parents.append(parent)

    # Author/commiter will always be this one

    author = pygit2.Signature(

        name=user.username,

        email=user.email

    )

    # Actually commit

    sha = new_repo.create_commit(

        'refs/heads/master',

        author,

        author,

        'Add file %s to ticket %s: %s' % (filename, issue.uid, issue.title),

        new_repo.index.write_tree(),

        parents)

    index.write()

    # Push to origin

    ori_remote = new_repo.remotes[0]

    master_ref = new_repo.lookup_reference('HEAD').resolve()

    refname = '%s:%s' % (master_ref.name, master_ref.name)

    ori_remote.push(refname)

    # Remove the clone

    shutil.rmtree(newpath)

    return os.path.join('files', filename)