# Copyright (C) 2013, 2014 Red Hat, Inc.
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA.

import difflib
import os

import virtinst
import virtinst.cli
import virtinst.uri


# pylint: disable=protected-access
# Access to protected member, needed to unittest stuff

class _CLIState(object):
    """
    Class containing any bits passed in from setup.py
    """
    def __init__(self):
        self.regenerate_output = False
        self.use_coverage = False
clistate = _CLIState()


_capsprefix  = ",caps=%s/tests/capabilities-xml/" % os.getcwd()
_domcapsprefix  = ",domcaps=%s/tests/capabilities-xml/" % os.getcwd()

uri_test_default = "__virtinst_test__test:///default,predictable"
uri_test = "__virtinst_test__test:///%s/tests/testdriver.xml,predictable" % os.getcwd()
uri_test_remote = uri_test + ",remote"

_uri_qemu = "%s,qemu" % uri_test
_uri_kvm_domcaps = (_uri_qemu + _domcapsprefix + "kvm-x86_64-domcaps.xml")
_uri_kvm_domcaps_q35 = (_uri_qemu + _domcapsprefix + "kvm-x86_64-domcaps-q35.xml")
_uri_kvm_aarch64_domcaps = (_uri_qemu + _domcapsprefix + "kvm-aarch64-domcaps.xml")
uri_kvm_nodomcaps = (_uri_qemu + _capsprefix + "kvm-x86_64.xml")
uri_kvm_rhel = (_uri_kvm_domcaps + _capsprefix + "kvm-x86_64-rhel7.xml")
uri_kvm = (_uri_kvm_domcaps + _capsprefix + "kvm-x86_64.xml")
uri_kvm_q35 = (_uri_kvm_domcaps_q35 + _capsprefix + "kvm-x86_64.xml")
uri_kvm_session = uri_kvm + ",session"

uri_kvm_armv7l = (_uri_kvm_domcaps + _capsprefix + "kvm-armv7l.xml")
uri_kvm_aarch64 = (_uri_kvm_aarch64_domcaps + _capsprefix + "kvm-aarch64.xml")
uri_kvm_ppc64le = (_uri_kvm_domcaps + _capsprefix + "kvm-ppc64le.xml")
uri_kvm_s390x = (_uri_kvm_domcaps + _capsprefix + "kvm-s390x.xml")
uri_kvm_s390x_KVMIBM = (_uri_kvm_domcaps + _capsprefix + "kvm-s390x-KVMIBM.xml")

uri_xen = uri_test + _capsprefix + "xen-rhel5.4.xml,xen"
uri_lxc = uri_test + _capsprefix + "lxc.xml,lxc"
uri_vz = uri_test + _capsprefix + "vz.xml,vz"


def get_debug():
    return ("DEBUG_TESTS" in os.environ and
            os.environ["DEBUG_TESTS"] == "1")


def _make_uri(base, connver=None, libver=None):
    if connver:
        base += ",connver=%s" % connver
    if libver:
        base += ",libver=%s" % libver
    return base


_conn_cache = {}


def openconn(uri):
    """
    Extra super caching to speed up the test suite. We basically
    cache the first guest/pool/vol poll attempt for each URI, and save it
    across multiple reopenings of that connection. We aren't caching
    libvirt objects, just parsed XML objects. This works fine since
    generally every test uses a fresh virConnect, or undoes the
    persistent changes it makes.
    """
    virtinst.util.register_libvirt_error_handler()
    conn = virtinst.cli.getConnection(uri)
    uri = conn._open_uri

    # For the basic test:///default URI, skip this caching, so we have
    # an option to test the stock code
    if uri == uri_test_default:
        return conn

    if uri not in _conn_cache:
        conn.fetch_all_guests()
        conn.fetch_all_pools()
        conn.fetch_all_vols()
        conn.fetch_all_nodedevs()

        _conn_cache[uri] = {}
        for key, value in conn._fetch_cache.items():
            _conn_cache[uri][key] = value[:]

    # Prime the internal connection cache
    for key, value in _conn_cache[uri].items():
        conn._fetch_cache[key] = value[:]

    def cb_cache_new_pool(poolobj):
        # Used by clonetest.py nvram-newpool test
        if poolobj.name() == "nvram-newpool":
            from virtinst import StorageVolume
            vol = StorageVolume(conn)
            vol.pool = poolobj
            vol.name = "clone-orig-vars.fd"
            vol.capacity = 1024 * 1024
            vol.install()
        conn._cache_new_pool_raw(poolobj)

    conn.cb_cache_new_pool = cb_cache_new_pool

    return conn


def open_testdefault():
    return openconn(uri_test_default)


def open_testdriver():
    return openconn(uri_test)


def open_kvm(connver=None, libver=None):
    return openconn(_make_uri(uri_kvm, connver, libver))


def open_kvm_rhel(connver=None):
    return openconn(_make_uri(uri_kvm_rhel, connver))


def open_test_remote():
    return openconn(uri_test_remote)


def test_create(testconn, xml, define_func="defineXML"):
    xml = virtinst.uri.sanitize_xml_for_test_define(xml)

    try:
        func = getattr(testconn, define_func)
        obj = func(xml)
    except Exception as e:
        raise RuntimeError(str(e) + "\n" + xml)

    try:
        obj.create()
        obj.destroy()
        obj.undefine()
    except Exception:
        try:
            obj.destroy()
        except Exception:
            pass
        try:
            obj.undefine()
        except Exception:
            pass


def read_file(filename):
    """Helper function to read a files contents and return them"""
    f = open(filename, "r")
    out = f.read()
    f.close()

    return out


def diff_compare(actual_out, filename=None, expect_out=None):
    """Compare passed string output to contents of filename"""
    if not expect_out:
        if not os.path.exists(filename) or clistate.regenerate_output:
            open(filename, "w").write(actual_out)
        expect_out = read_file(filename)

    diff = "".join(difflib.unified_diff(expect_out.splitlines(1),
                                        actual_out.splitlines(1),
                                        fromfile=filename or '',
                                        tofile="Generated Output"))
    if diff:
        raise AssertionError("Conversion outputs did not match.\n%s" % diff)