"""
multi_disk test for Autotest framework.

@copyright: 2011-2012 Red Hat Inc.
"""
import logging, re, random, string
from autotest.client.shared import error, utils
from virttest import qemu_qtree, env_process

_RE_RANGE1 = re.compile(r'range\([ ]*([-]?\d+|n).*\)')
_RE_RANGE2 = re.compile(r',[ ]*([-]?\d+|n)')
_RE_BLANKS = re.compile(r'^([ ]*)')


@error.context_aware
def _range(buf, n=None):
    """
    Converts 'range(..)' string to range. It supports 1-4 args. It supports
    'n' as correct input, which is substituted to return the correct range.
    range1-3 ... ordinary python range()
    range4   ... multiplies the occurrence of each value
                (range(0,4,1,2) => [0,0,1,1,2,2,3,3])
    @raise ValueError: In case incorrect values are given.
    @return: List of int values. In case it can't substitute 'n'
             it returns the original string.
    """
    out = _RE_RANGE1.match(buf)
    if not out:
        return False
    out = [out.groups()[0]]
    out.extend(_RE_RANGE2.findall(buf))
    if 'n' in out:
        if n is None:
            # Don't know what to substitute, return the original
            return buf
        else:
            # Doesn't cover all cases and also it works it's way...
            n = int(n)
            if out[0] == 'n':
                out[0] = int(n)
            if len(out) > 1 and out[1] == 'n':
                out[1] = int(out[0]) + n
            if len(out) > 2 and out[2] == 'n':
                out[2] = (int(out[1]) - int(out[0])) / n
            if len(out) > 3 and out[3] == 'n':
                _len = len(range(int(out[0]), int(out[1]), int(out[2])))
                out[3] = n / _len
                if n % _len:
                    out[3] += 1
    for i in range(len(out)):
        out[i] = int(out[i])
    if len(out) == 1:
        out = range(out[0])
    elif len(out) == 2:
        out = range(out[0], out[1])
    elif len(out) == 3:
        out = range(out[0], out[1], out[2])
    elif len(out) == 4:
        # arg4 * range
        _out = []
        for _ in range(out[0], out[1], out[2]):
            _out.extend([_] * out[3])
        out = _out
    else:
        raise ValueError("More than 4 parameters in _range()")
    return out


@error.context_aware
def run_multi_disk(test, params, env):
    """
    Test multi disk suport of guest, this case will:
    1) Create disks image in configuration file.
    2) Start the guest with those disks.
    3) Checks qtree vs. test params. (Optional)
    4) Create partition on those disks.
    5) Get disk dev filenames in guest.
    6) Format those disks in guest.
    7) Copy file into / out of those disks.
    8) Compare the original file and the copied file using md5 or fc comand.
    9) Repeat steps 3-5 if needed.

    @param test: QEMU test object
    @param params: Dictionary with the test parameters
    @param env: Dictionary with test environment.
    """
    def _add_param(name, value):
        """ Converts name+value to stg_params string """
        if value:
            value = re.sub(' ', '\\ ', value)
            return " %s:%s " % (name, value)
        else:
            return ''


    def _do_post_cmd(session):
        cmd = params.get("post_cmd")
        if cmd:
            session.cmd_status_output(cmd)
        session.close()

    error.context("Parsing test configuration", logging.info)
    stg_image_num = 0
    stg_params = params.get("stg_params", "")
    # Compatibility
    stg_params += _add_param("image_size", params.get("stg_image_size"))
    stg_params += _add_param("image_format", params.get("stg_image_format"))
    stg_params += _add_param("image_boot", params.get("stg_image_boot", "no"))
    stg_params += _add_param("drive_format", params.get("stg_drive_format"))
    stg_params += _add_param("drive_cache", params.get("stg_drive_cache"))
    if params.get("stg_assign_index") != "no":
        # Assume 0 and 1 are already occupied (hd0 and cdrom)
        stg_params += _add_param("drive_index", 'range(2,n)')
    param_matrix = {}

    stg_params = stg_params.split(' ')
    i = 0
    while i < len(stg_params) - 1:
        if not stg_params[i].strip():
            i += 1
            continue
        if stg_params[i][-1] == '\\':
            stg_params[i] = '%s %s' % (stg_params[i][:-1],
                                          stg_params.pop(i + 1))
        i += 1

    rerange = []
    has_name = False
    for i in xrange(len(stg_params)):
        if not stg_params[i].strip():
            continue
        (cmd, parm) = stg_params[i].split(':', 1)
        if cmd == "image_name":
            has_name = True
        if _RE_RANGE1.match(parm):
            parm = _range(parm)
            if parm == False:
                raise error.TestError("Incorrect cfg: stg_params %s looks "
                                      "like range(..) but doesn't contain "
                                      "numbers." % cmd)
            param_matrix[cmd] = parm
            if type(parm) is str:
                # When we know the stg_image_num, substitute it.
                rerange.append(cmd)
                continue
        else:
            # ',' separated list of values
            parm = parm.split(',')
            j = 0
            while j < len(parm) - 1:
                if parm[j][-1] == '\\':
                    parm[j] = '%s,%s' % (parm[j][:-1], parm.pop(j + 1))
                j += 1
            param_matrix[cmd] = parm
        stg_image_num = max(stg_image_num, len(parm))

    stg_image_num = int(params.get('stg_image_num', stg_image_num))
    for cmd in rerange:
        param_matrix[cmd] = _range(param_matrix[cmd], stg_image_num)
    # param_table* are for pretty print of param_matrix
    param_table = []
    param_table_header = ['name']
    if not has_name:
        param_table_header.append('image_name')
    for _ in param_matrix:
        param_table_header.append(_)

    stg_image_name = params.get('stg_image_name', 'images/%s')
    for i in xrange(stg_image_num):
        name = "stg%d" % i
        params['images'] += " %s" % name
        param_table.append([])
        param_table[-1].append(name)
        if not has_name:
            params["image_name_%s" % name] = stg_image_name % name
            param_table[-1].append(params.get("image_name_%s" % name))
        for parm in param_matrix.iteritems():
            params['%s_%s' % (parm[0], name)] = str(parm[1][i % len(parm[1])])
            param_table[-1].append(params.get('%s_%s' % (parm[0], name)))

    if params.get("multi_disk_params_only") == 'yes':
        # Only print the test param_matrix and finish
        logging.info('Newly added disks:\n%s',
                     utils.matrix_to_string(param_table, param_table_header))
        return

    # Always recreate VMs and disks
    error.context("Start the guest with new disks", logging.info)
    for vm_name in params.objects("vms"):
        vm_params = params.object_params(vm_name)
        for image_name in vm_params.objects("images"):
            image_params = vm_params.object_params(image_name)
            env_process.preprocess_image(test, image_params, image_name)

    error.context("Start the guest with those disks", logging.info)
    vm = env.get_vm(params["main_vm"])
    vm.create(timeout=max(10, stg_image_num), params=params)
    session = vm.wait_for_login(timeout=int(params.get("login_timeout", 360)))

    n_repeat = int(params.get("n_repeat", "1"))
    file_system = [_.strip() for _ in params.get("file_system").split()]
    cmd_timeout = float(params.get("cmd_timeout", 360))
    re_str = params["re_str"]
    black_list = params["black_list"].split()

    have_qtree = True
    out = vm.monitor.human_monitor_cmd("info qtree", debug=False)
    if "unknown command" in str(out):
        have_qtree = False

    if have_qtree:
        error.context("Verifying qtree vs. test params")
        err = 0
        qtree = qemu_qtree.QtreeContainer()
        qtree.parse_info_qtree(vm.monitor.info('qtree'))
        disks = qemu_qtree.QtreeDisksContainer(qtree.get_nodes())
        (tmp1, tmp2) = disks.parse_info_block(vm.monitor.info_block())
        err += tmp1 + tmp2
        err += disks.generate_params()
        err += disks.check_disk_params(params)
        (tmp1, tmp2, _, _) = disks.check_guests_proc_scsi(
                                    session.cmd_output('cat /proc/scsi/scsi'))
        err += tmp1 + tmp2

        if err:
            raise error.TestFail("%s errors occurred while verifying"
                                 " qtree vs. params" % err)
        if params.get('multi_disk_only_qtree') == 'yes':
            return

    try:
        cmd = params.get("clean_cmd")
        if cmd:
            session.cmd_status_output(cmd)

        cmd = params.get("pre_cmd")
        if cmd:
            error.context("Create partition on those disks", logging.info)
            s, output = session.cmd_status_output(cmd, timeout=cmd_timeout)
            if s != 0:
                raise error.TestFail("Create partition on disks failed.\n"
                                     "Output is: %s\n" % output)

        error.context("Get disks dev filenames in guest", logging.info)
        cmd = params["list_volume_command"]
        s, output = session.cmd_status_output(cmd, timeout=cmd_timeout)
        if s != 0:
            raise error.TestFail("List volume command failed with cmd '%s'.\n"
                                 "Output is: %s\n" % (cmd, output))

        output = session.cmd_output(cmd, timeout=cmd_timeout)
        disks = re.findall(re_str, output)
        disks = map(string.strip, disks)
        disks.sort()
        logging.debug("Volume list that meet regular expressions: %s",
                      " ".join(disks))

        if len(disks) < len(params.get("images").split()):
            raise error.TestFail("Fail to list all the volumes!")

        if params.get("os_type") == "linux":
            df_output = session.cmd_output("df")
            li = re.findall(r"^/dev/(.*?)[ \d]", df_output, re.M)
            if li:
                black_list.extend(li)

        exclude_list = [d for d in disks if d in black_list]
        func = lambda d: logging.info("No need to check volume '%s'", d)
        map(func, exclude_list)

        disks = [d for d in disks if d not in exclude_list]
    except Exception:
        _do_post_cmd(session)
        raise

    try:
        for i in range(n_repeat):
            logging.info("iterations: %s", (i + 1))
            error.context("Format those disks in guest", logging.info)
            for disk in disks:
                disk = disk.strip()
                error.context("Preparing disk: %s..." % disk)

                # Random select one file system from file_system
                index = random.randint(0, (len(file_system) - 1))
                fs = file_system[index].strip()
                cmd = params["format_command"] % (fs, disk)
                error.context("formatting test disk")
                session.cmd(cmd, timeout=cmd_timeout)
                cmd = params.get("mount_command")
                if cmd:
                    cmd = cmd % (disk, disk, disk)
                    session.cmd(cmd)

            error.context("Cope file into / out of those disks", logging.info)
            for disk in disks:
                disk = disk.strip()

                error.context("Performing I/O on disk: %s..." % disk)
                cmd_list = params["cmd_list"].split()
                for cmd_l in cmd_list:
                    cmd = params.get(cmd_l)
                    if cmd:
                        session.cmd(cmd % disk, timeout=cmd_timeout)

                cmd = params["compare_command"]
                key_word = params["check_result_key_word"]
                output = session.cmd_output(cmd)
                if key_word not in output:
                    raise error.TestFail("Files on guest os root fs and disk "
                                         "differ")

            if params.get("umount_command"):
                cmd = params.get("show_mount_cmd")
                output = session.cmd_output(cmd)
                disks = re.findall(re_str, output)
                disks.sort()
                for disk in disks:
                    disk = disk.strip()
                    error.context("Unmounting disk: %s..." % disk)
                    cmd = params.get("umount_command") % (disk, disk)
                    session.cmd(cmd)
    finally:
        cmd = params.get("show_mount_cmd")
        if cmd:
            try:
                output = session.cmd_output(cmd)
                disks = re.findall(re_str, output)
                disks.sort()
                for disk in disks:
                    error.context("Unmounting disk: %s..." % disk)
                    cmd = params["umount_command"] % (disk, disk)
                    session.cmd(cmd)
            except Exception, err:
                logging.warn("Get error when cleanup, '%s'", err)

        _do_post_cmd(session)
        session.close()