# -*- coding: utf-8 -*-
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""
kallithea.lib.hooks
~~~~~~~~~~~~~~~~~~~

Hooks run by Kallithea

This file was forked by the Kallithea project in July 2014.
Original author and date, and relevant copyright and licensing information is below:
:created_on: Aug 6, 2010
:author: marcink
:copyright: (c) 2013 RhodeCode GmbH, and others.
:license: GPLv3, see LICENSE.md for more details.
"""

import os
import sys
import time
import binascii

from kallithea.lib.vcs.utils.hgcompat import nullrev, revrange
from kallithea.lib import helpers as h
from kallithea.lib.utils import action_logger
from kallithea.lib.vcs.backends.base import EmptyChangeset
from kallithea.lib.exceptions import HTTPLockedRC, UserCreationError
from kallithea.lib.utils2 import safe_str, safe_unicode, _extract_extras
from kallithea.model.db import Repository, User


def _get_scm_size(alias, root_path):

    if not alias.startswith('.'):
        alias += '.'

    size_scm, size_root = 0, 0
    for path, dirs, files in os.walk(safe_str(root_path)):
        if path.find(alias) != -1:
            for f in files:
                try:
                    size_scm += os.path.getsize(os.path.join(path, f))
                except OSError:
                    pass
        else:
            for f in files:
                try:
                    size_root += os.path.getsize(os.path.join(path, f))
                except OSError:
                    pass

    size_scm_f = h.format_byte_size(size_scm)
    size_root_f = h.format_byte_size(size_root)
    size_total_f = h.format_byte_size(size_root + size_scm)

    return size_scm_f, size_root_f, size_total_f


def repo_size(ui, repo, hooktype=None, **kwargs):
    """
    Presents size of repository after push

    :param ui:
    :param repo:
    :param hooktype:
    """

    size_hg_f, size_root_f, size_total_f = _get_scm_size('.hg', repo.root)

    last_cs = repo[len(repo) - 1]

    msg = ('Repository size .hg: %s Checkout: %s Total: %s\n'
           'Last revision is now r%s:%s\n') % (
        size_hg_f, size_root_f, size_total_f, last_cs.rev(), last_cs.hex()[:12]
    )
    ui.status(msg)


def pre_push(ui, repo, **kwargs):
    # pre push function, currently used to ban pushing when
    # repository is locked
    ex = _extract_extras()

    usr = User.get_by_username(ex.username)
    if ex.locked_by[0] and usr.user_id != int(ex.locked_by[0]):
        locked_by = User.get(ex.locked_by[0]).username
        # this exception is interpreted in git/hg middlewares and based
        # on that proper return code is server to client
        _http_ret = HTTPLockedRC(ex.repository, locked_by)
        if str(_http_ret.code).startswith('2'):
            #2xx Codes don't raise exceptions
            ui.status(safe_str(_http_ret.title))
        else:
            raise _http_ret


def pre_pull(ui, repo, **kwargs):
    # pre pull function ...
    ex = _extract_extras()
    if ex.locked_by[0]:
        locked_by = User.get(ex.locked_by[0]).username
        # this exception is interpreted in git/hg middlewares and based
        # on that proper return code is server to client
        _http_ret = HTTPLockedRC(ex.repository, locked_by)
        if str(_http_ret.code).startswith('2'):
            #2xx Codes don't raise exceptions
            ui.status(safe_str(_http_ret.title))
        else:
            raise _http_ret


def log_pull_action(ui, repo, **kwargs):
    """
    Logs user last pull action

    :param ui:
    :param repo:
    """
    ex = _extract_extras()

    user = User.get_by_username(ex.username)
    action = 'pull'
    action_logger(user, action, ex.repository, ex.ip, commit=True)
    # extension hook call
    from kallithea import EXTENSIONS
    callback = getattr(EXTENSIONS, 'PULL_HOOK', None)
    if callable(callback):
        kw = {}
        kw.update(ex)
        callback(**kw)

    if ex.make_lock is not None and ex.make_lock:
        Repository.lock(Repository.get_by_repo_name(ex.repository), user.user_id)
        #msg = 'Made lock on repo `%s`' % repository
        #ui.status(msg)

    if ex.locked_by[0]:
        locked_by = User.get(ex.locked_by[0]).username
        _http_ret = HTTPLockedRC(ex.repository, locked_by)
        if str(_http_ret.code).startswith('2'):
            #2xx Codes don't raise exceptions
            ui.status(safe_str(_http_ret.title))
    return 0


def log_push_action(ui, repo, **kwargs):
    """
    Register that changes have been pushed.
    Mercurial invokes this directly as a hook, git uses handle_git_receive.
    """

    ex = _extract_extras()

    action_tmpl = ex.action + ':%s'
    revs = []
    if ex.scm == 'hg':
        node = kwargs['node']

        def get_revs(repo, rev_opt):
            if rev_opt:
                revs = revrange(repo, rev_opt)

                if len(revs) == 0:
                    return (nullrev, nullrev)
                return max(revs), min(revs)
            else:
                return len(repo) - 1, 0

        stop, start = get_revs(repo, [node + ':'])
        _h = binascii.hexlify
        revs = [_h(repo[r].node()) for r in xrange(start, stop + 1)]
    elif ex.scm == 'git':
        revs = kwargs.get('_git_revs', [])
        if '_git_revs' in kwargs:
            kwargs.pop('_git_revs')

    action = action_tmpl % ','.join(revs)
    action_logger(ex.username, action, ex.repository, ex.ip, commit=True)

    # extension hook call
    from kallithea import EXTENSIONS
    callback = getattr(EXTENSIONS, 'PUSH_HOOK', None)
    if callable(callback):
        kw = {'pushed_revs': revs}
        kw.update(ex)
        callback(**kw)

    if ex.make_lock is not None and not ex.make_lock:
        Repository.unlock(Repository.get_by_repo_name(ex.repository))
        ui.status(safe_str('Released lock on repo `%s`\n' % ex.repository))

    if ex.locked_by[0]:
        locked_by = User.get(ex.locked_by[0]).username
        _http_ret = HTTPLockedRC(ex.repository, locked_by)
        if str(_http_ret.code).startswith('2'):
            #2xx Codes don't raise exceptions
            ui.status(safe_str(_http_ret.title))

    return 0


def log_create_repository(repository_dict, created_by, **kwargs):
    """
    Post create repository Hook.

    :param repository: dict dump of repository object
    :param created_by: username who created repository

    available keys of repository_dict:

     'repo_type',
     'description',
     'private',
     'created_on',
     'enable_downloads',
     'repo_id',
     'owner_id',
     'enable_statistics',
     'clone_uri',
     'fork_id',
     'group_id',
     'repo_name'

    """
    from kallithea import EXTENSIONS
    callback = getattr(EXTENSIONS, 'CREATE_REPO_HOOK', None)
    if callable(callback):
        kw = {}
        kw.update(repository_dict)
        kw.update({'created_by': created_by})
        kw.update(kwargs)
        return callback(**kw)

    return 0


def check_allowed_create_user(user_dict, created_by, **kwargs):
    # pre create hooks
    from kallithea import EXTENSIONS
    callback = getattr(EXTENSIONS, 'PRE_CREATE_USER_HOOK', None)
    if callable(callback):
        allowed, reason = callback(created_by=created_by, **user_dict)
        if not allowed:
            raise UserCreationError(reason)


def log_create_user(user_dict, created_by, **kwargs):
    """
    Post create user Hook.

    :param user_dict: dict dump of user object

    available keys for user_dict:

     'username',
     'full_name_or_username',
     'full_contact',
     'user_id',
     'name',
     'firstname',
     'short_contact',
     'admin',
     'lastname',
     'ip_addresses',
     'ldap_dn',
     'email',
     'api_key',
     'last_login',
     'full_name',
     'active',
     'password',
     'emails',
     'inherit_default_permissions'

    """
    from kallithea import EXTENSIONS
    callback = getattr(EXTENSIONS, 'CREATE_USER_HOOK', None)
    if callable(callback):
        return callback(created_by=created_by, **user_dict)

    return 0


def log_delete_repository(repository_dict, deleted_by, **kwargs):
    """
    Post delete repository Hook.

    :param repository: dict dump of repository object
    :param deleted_by: username who deleted the repository

    available keys of repository_dict:

     'repo_type',
     'description',
     'private',
     'created_on',
     'enable_downloads',
     'repo_id',
     'owner_id',
     'enable_statistics',
     'clone_uri',
     'fork_id',
     'group_id',
     'repo_name'

    """
    from kallithea import EXTENSIONS
    callback = getattr(EXTENSIONS, 'DELETE_REPO_HOOK', None)
    if callable(callback):
        kw = {}
        kw.update(repository_dict)
        kw.update({'deleted_by': deleted_by,
                   'deleted_on': time.time()})
        kw.update(kwargs)
        return callback(**kw)

    return 0


def log_delete_user(user_dict, deleted_by, **kwargs):
    """
    Post delete user Hook.

    :param user_dict: dict dump of user object

    available keys for user_dict:

     'username',
     'full_name_or_username',
     'full_contact',
     'user_id',
     'name',
     'firstname',
     'short_contact',
     'admin',
     'lastname',
     'ip_addresses',
     'ldap_dn',
     'email',
     'api_key',
     'last_login',
     'full_name',
     'active',
     'password',
     'emails',
     'inherit_default_permissions'

    """
    from kallithea import EXTENSIONS
    callback = getattr(EXTENSIONS, 'DELETE_USER_HOOK', None)
    if callable(callback):
        return callback(deleted_by=deleted_by, **user_dict)

    return 0


def handle_git_pre_receive(repo_path, revs, env):
    return handle_git_receive(repo_path, revs, env, hook_type='pre')


def handle_git_post_receive(repo_path, revs, env):
    return handle_git_receive(repo_path, revs, env, hook_type='post')


def handle_git_receive(repo_path, revs, env, hook_type):
    """
    A really hacky method that is run by git post-receive hook and logs
    a push action together with pushed revisions. It's executed by subprocess
    thus needs all info to be able to create an on the fly app environment,
    connect to database and run the logging code. Hacky as sh*t but works.

    :param repo_path:
    :param revs:
    :param env:
    """
    from paste.deploy import appconfig
    from sqlalchemy import engine_from_config
    from kallithea.config.environment import load_environment
    from kallithea.model.base import init_model
    from kallithea.model.db import Ui
    from kallithea.lib.utils import make_ui, setup_cache_regions
    extras = _extract_extras(env)

    repo_path = safe_unicode(repo_path)
    path, ini_name = os.path.split(extras['config'])
    conf = appconfig('config:%s' % ini_name, relative_to=path)
    conf = load_environment(conf.global_conf, conf.local_conf)

    setup_cache_regions(conf)

    engine = engine_from_config(conf, 'sqlalchemy.')
    init_model(engine)

    baseui = make_ui('db')
    # fix if it's not a bare repo
    if repo_path.endswith(os.sep + '.git'):
        repo_path = repo_path[:-5]

    repo = Repository.get_by_full_path(repo_path)
    if not repo:
        raise OSError('Repository %s not found in database'
                      % (safe_str(repo_path)))

    _hooks = dict(baseui.configitems('hooks')) or {}

    if hook_type == 'pre':
        repo = repo.scm_instance
    else:
        # post push shouldn't use the cached instance never
        repo = repo.scm_instance_no_cache()

    if hook_type == 'pre':
        pre_push(baseui, repo)

    # if push hook is enabled via web interface
    elif hook_type == 'post' and _hooks.get(Ui.HOOK_PUSH):
        rev_data = []
        for l in revs:
            old_rev, new_rev, ref = l.strip().split(' ')
            _ref_data = ref.split('/')
            if _ref_data[1] in ['tags', 'heads']:
                rev_data.append({'old_rev': old_rev,
                                 'new_rev': new_rev,
                                 'ref': ref,
                                 'type': _ref_data[1],
                                 'name': '/'.join(_ref_data[2:])})

        git_revs = []

        for push_ref in rev_data:
            _type = push_ref['type']
            if _type == 'heads':
                if push_ref['old_rev'] == EmptyChangeset().raw_id:
                    # update the symbolic ref if we push new repo
                    if repo.is_empty():
                        repo._repo.refs.set_symbolic_ref('HEAD',
                                            'refs/heads/%s' % push_ref['name'])

                    cmd = ['for-each-ref', '--format=%(refname)','refs/heads/*']
                    heads = repo.run_git_command(cmd)[0]
                    cmd = ['log', push_ref['new_rev'],
                           '--reverse', '--pretty=format:%H', '--not']
                    heads = heads.replace(push_ref['ref'], '')
                    for l in heads.splitlines():
                        cmd.append(l.strip())
                    git_revs += repo.run_git_command(cmd)[0].splitlines()

                elif push_ref['new_rev'] == EmptyChangeset().raw_id:
                    #delete branch case
                    git_revs += ['delete_branch=>%s' % push_ref['name']]
                else:
                    cmd = ['log', '%(old_rev)s..%(new_rev)s' % push_ref,
                           '--reverse', '--pretty=format:%H']
                    git_revs += repo.run_git_command(cmd)[0].splitlines()

            elif _type == 'tags':
                git_revs += ['tag=>%s' % push_ref['name']]

        log_push_action(baseui, repo, _git_revs=git_revs)