# (c) 2014 Michael DeHaan, <michael@ansible.com>
#
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.

# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import os
import tempfile
import tarfile

from subprocess import Popen, PIPE

from ansible import constants as C
from ansible.errors import AnsibleError
from ansible.module_utils._text import to_native
from ansible.module_utils.common.process import get_bin_path
from ansible.module_utils.six import string_types
from ansible.playbook.role.definition import RoleDefinition
from ansible.utils.display import Display

__all__ = ['RoleRequirement']

VALID_SPEC_KEYS = [
    'name',
    'role',
    'scm',
    'src',
    'version',
]

display = Display()


class RoleRequirement(RoleDefinition):

    """
    Helper class for Galaxy, which is used to parse both dependencies
    specified in meta/main.yml and requirements.yml files.
    """

    def __init__(self):
        pass

    @staticmethod
    def repo_url_to_role_name(repo_url):
        # gets the role name out of a repo like
        # http://git.example.com/repos/repo.git" => "repo"

        if '://' not in repo_url and '@' not in repo_url:
            return repo_url
        trailing_path = repo_url.split('/')[-1]
        if trailing_path.endswith('.git'):
            trailing_path = trailing_path[:-4]
        if trailing_path.endswith('.tar.gz'):
            trailing_path = trailing_path[:-7]
        if ',' in trailing_path:
            trailing_path = trailing_path.split(',')[0]
        return trailing_path

    @staticmethod
    def role_yaml_parse(role):

        if isinstance(role, string_types):
            name = None
            scm = None
            src = None
            version = None
            if ',' in role:
                if role.count(',') == 1:
                    (src, version) = role.strip().split(',', 1)
                elif role.count(',') == 2:
                    (src, version, name) = role.strip().split(',', 2)
                else:
                    raise AnsibleError("Invalid role line (%s). Proper format is 'role_name[,version[,name]]'" % role)
            else:
                src = role

            if name is None:
                name = RoleRequirement.repo_url_to_role_name(src)
            if '+' in src:
                (scm, src) = src.split('+', 1)

            return dict(name=name, src=src, scm=scm, version=version)

        if 'role' in role:
            name = role['role']
            if ',' in name:
                raise AnsibleError("Invalid old style role requirement: %s" % name)
            else:
                del role['role']
                role['name'] = name
        else:
            role = role.copy()

            if 'src'in role:
                # New style: { src: 'galaxy.role,version,name', other_vars: "here" }
                if 'github.com' in role["src"] and 'http' in role["src"] and '+' not in role["src"] and not role["src"].endswith('.tar.gz'):
                    role["src"] = "git+" + role["src"]

                if '+' in role["src"]:
                    (scm, src) = role["src"].split('+')
                    role["scm"] = scm
                    role["src"] = src

                if 'name' not in role:
                    role["name"] = RoleRequirement.repo_url_to_role_name(role["src"])

            if 'version' not in role:
                role['version'] = ''

            if 'scm' not in role:
                role['scm'] = None

        for key in list(role.keys()):
            if key not in VALID_SPEC_KEYS:
                role.pop(key)

        return role

    @staticmethod
    def scm_archive_role(src, scm='git', name=None, version='HEAD', keep_scm_meta=False):

        def run_scm_cmd(cmd, tempdir):
            try:
                stdout = ''
                stderr = ''
                popen = Popen(cmd, cwd=tempdir, stdout=PIPE, stderr=PIPE)
                stdout, stderr = popen.communicate()
            except Exception as e:
                ran = " ".join(cmd)
                display.debug("ran %s:" % ran)
                display.debug("\tstdout: " + stdout)
                display.debug("\tstderr: " + stderr)
                raise AnsibleError("when executing %s: %s" % (ran, to_native(e)))
            if popen.returncode != 0:
                raise AnsibleError("- command %s failed in directory %s (rc=%s)" % (' '.join(cmd), tempdir, popen.returncode))

        if scm not in ['hg', 'git']:
            raise AnsibleError("- scm %s is not currently supported" % scm)

        try:
            scm_path = get_bin_path(scm, required=True)
        except (ValueError, OSError, IOError):
            raise AnsibleError("could not find/use %s, it is required to continue with installing %s" % (scm, src))

        tempdir = tempfile.mkdtemp(dir=C.DEFAULT_LOCAL_TMP)
        clone_cmd = [scm_path, 'clone', src, name]
        run_scm_cmd(clone_cmd, tempdir)

        if scm == 'git' and version:
            checkout_cmd = [scm_path, 'checkout', version]
            run_scm_cmd(checkout_cmd, os.path.join(tempdir, name))

        temp_file = tempfile.NamedTemporaryFile(delete=False, suffix='.tar', dir=C.DEFAULT_LOCAL_TMP)
        archive_cmd = None
        if keep_scm_meta:
            display.vvv('tarring %s from %s to %s' % (name, tempdir, temp_file.name))
            with tarfile.open(temp_file.name, "w") as tar:
                tar.add(os.path.join(tempdir, name), arcname=name)
        elif scm == 'hg':
            archive_cmd = [scm_path, 'archive', '--prefix', "%s/" % name]
            if version:
                archive_cmd.extend(['-r', version])
            archive_cmd.append(temp_file.name)
        elif scm == 'git':
            archive_cmd = [scm_path, 'archive', '--prefix=%s/' % name, '--output=%s' % temp_file.name]
            if version:
                archive_cmd.append(version)
            else:
                archive_cmd.append('HEAD')

        if archive_cmd is not None:
            display.vvv('archiving %s' % archive_cmd)
            run_scm_cmd(archive_cmd, os.path.join(tempdir, name))

        return temp_file.name