#!/usr/bin/python
# -*- coding: utf-8 -*-

# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
# (c) 2013, Dylan Martin <dmartin@seattlecentral.edu>
#
# 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/>.

import os
# class to handle .zip files
class _zipfile(object):
    
    def __init__(self,src,dest,module):
        self.src = src
        self.dest = dest
        self.module = module

    def is_unarchived(self):
        return dict(bool = False)

    def unarchive(self):
        cmd = 'unzip "%s" -d "%s" -o'  % (self.src,self.dest)
        rc, out, err = self.module.run_command(cmd)
        return dict(cmd = cmd, rc=rc, out=out, err=err)

    def can_handle_archive(self):
        cmd = 'unzip -l "%s"' % (self.src)
        rc, out, err = self.module.run_command(cmd)
        if rc == 0:
            return True
        return False

# class to handle gzipped tar files
class _tgzfile(object):
    
    def __init__(self,src,dest,module):
        self.src = src
        self.dest = dest
        self.module = module
        self.zipflag = 'z'

    def is_unarchived(self):
        dirof = os.path.dirname(self.dest)
        destbase = os.path.basename(self.dest)
        cmd = 'tar -v -C "%s" --diff -%sf "%s"'  % (self.dest, self.zipflag,self.src )
        rc, out, err = self.module.run_command(cmd)
        bool = True if rc == 0 else False
        return dict( bool = bool, rc = rc , out = out, err = err, cmd = cmd)

    def unarchive(self):
        cmd = 'tar -C "%s" -x%sf "%s"' % (self.dest,self.zipflag,self.src)
        rc, out, err = self.module.run_command(cmd)
        return dict(cmd = cmd, rc=rc, out=out, err=err)

    def can_handle_archive(self):
        cmd = 'tar -t%sf "%s"' % (self.zipflag,self.src)
        rc, out, err = self.module.run_command(cmd)
        if rc == 0:
            return True
        return False

# class to handle tar files that aren't compressed
class _tarfile(_tgzfile):
    def __init__(self,src,dest,module):
        self.src = src
        self.dest = dest
        self.module = module
        self.zipflag = ''

# class to handle bzip2 compressed tar files
class _tarbzip(_tgzfile):
    def __init__(self,src,dest,module):
        self.src = src
        self.dest = dest
        self.module = module
        self.zipflag = 'j'

# class to handle xz compressed tar files
class _tarxz(_tgzfile):
    def __init__(self,src,dest,module):
        self.src = src
        self.dest = dest
        self.module = module
        self.zipflag = 'J'

DOCUMENTATION = '''
---
module: unarchive
short_description: Copies archive to remote locations and unpacks them
description:
     - The M(unarchive) module copies an archive file on the local box to remote locations and unpacks them.
options:
  src:
    description:
      - Local path to archive file to copy to the remote server; can be absolute or relative.
    required: true
    default: null
  dest:
    description:
      - Remote absolute path where the archive should be unpacked
    required: true
    default: null
author: Dylan Martin 
notes:
    - requires tar command on host
    - can handle gzip, bzip2 and xz compressed as well as uncompressed
    - uses tar's --diff arg to calculate if changed or not.  If this arg is not
      supported, it will always unpack the archive
    - existing files/directories in the destination which are not in the archvie
      are not touched.  This is the same behavior as a normal archive extraction
    - existing files/directories in the destination which are not in the archvie
      are ignored for purposes of deciding if the archive should be unpacked or not
'''

EXAMPLES = '''
# Example from Ansible Playbooks
- unarchive: src=foo.tgz dest=/var/lib/foo
'''
# try handlers in order and return the one that works or bail if none work
def pick_handler (src,dest,module):
    handlers = [_tgzfile, _zipfile, _tarfile, _tarbzip, _tarxz]
    for handler in handlers:
        obj = handler(src,dest,module)
        if obj.can_handle_archive():
            return obj
    raise RuntimeError('Failed to find handler to unarchive "%s"' % src)

def main():
    module = AnsibleModule(
        # not checking because of daisy chain to file module
        argument_spec = dict(
            src               = dict(required=False),
            original_basename = dict(required=False), # used to handle 'dest is a directory' via template, a slight hack
            dest              = dict(required=True),
        ),
        add_file_common_args=True,
    )

    src    = os.path.expanduser(module.params['src'])
    dest   = os.path.expanduser(module.params['dest'])

    # did tar file arrive?
    if not os.path.exists(src):
        module.fail_json(msg="Source '%s' failed to transfer" % (src))
    if not os.access(src, os.R_OK):
        module.fail_json(msg="Source '%s' not readable" % (src))

    # is dest OK to recieve tar file?
    if not os.path.exists(os.path.dirname(dest)):
        module.fail_json(msg="Destination directory '%s' does not exist" % (os.path.dirname(dest)))
    if not os.access(os.path.dirname(dest), os.W_OK):
        module.fail_json(msg="Destination '%s' not writable" % (os.path.dirname(dest)))

    handler = pick_handler(src,dest,module)

    res_args = dict( handler=handler.__class__.__name__, dest = dest, src = src )

    # do we need to do unpack?
    namelist = ['bool','rc','out','err','cmd']
    res_args['check_results'] = handler.is_unarchived()
    if res_args['check_results']['bool']:
        res_args['changed'] = False
        module.exit_json(**res_args)

    # do the unpack
    try:
        results = handler.unarchive()
        #results = (src,dest,module)
    except IOError:
        module.fail_json(msg="failed to unpack %s to %s" % (src, dest))

    res_args['changed'] = True

    module.exit_json(**res_args)

# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()