#!/usr/bin/python

import os
from operator import xor

def main():
    module = AnsibleModule(
        argument_spec = dict(
            path = dict(required=True),
            base = dict(default=""),
            p_enabled = dict(default='enabled'),
            p_available = dict(default='available'),
            name = dict(required=True),
            suffix= dict(default='.conf'),
            state = dict(default='present', choices=['present', 'absent']),
        )
    )

    # path: /etc/apache2 or /etc/apache2/conf-
    # base: conf- or ""
    # name: FILENAME or FILENAME.conf
    path = module.params.get('path')
    base = module.params.get('base')
    p_enabled = module.params.get('p_enabled')
    p_available = module.params.get('p_available')
    name = module.params.get('name')
    suffix = module.params.get('suffix')
    state = module.params.get('state') == 'present'

    # pre-checks
    if os.path.isdir(path):
        p_available = os.path.join(path, base + p_available)
        p_enabled = os.path.join(path, base + p_enabled)
    else:
        p_available = path + p_available
        p_enabled = path + p_enabled

    for p in [p_available, p_enabled]:
        if not os.path.isdir(p):
            module.fail_json(msg="Directory %s not found" % p)

    # define internal variables
    src = os.path.join(p_available, name + suffix)
    dest = os.path.join(p_enabled, name + suffix)

    if not (os.path.isfile(src) or os.path.islink(src)):
        module.fail_json(msg="Source not found")

    dest_exists=True
    if not (os.path.isfile(dest) or os.path.islink(dest)):
        dest_exists=False

    # if there's no difference, no change, exit "ok"
    if not xor(state, dest_exists):
        module.exit_json()

    if state:
        # try to create symlink
        try:
            os.symlink(os.path.relpath(src, p_enabled), dest)
        except:
            module.fail_json(msg="Could not create symlink")
    else:
        # test, if symlink
        if not os.path.islink(dest):
            module.fail_json(msg="Destination is not a symlink")

        # try to remove symlink
        try:
            os.unlink(dest)
        except:
            module.fail_json(msg="Could not remove symlink")

    module.exit_json(changed=True)



from ansible.module_utils.basic import *
if __name__ == '__main__':
    main()