"""
Support for Linux LVM2
"""

import logging
import os.path

import salt.utils.path

# Set up logger
log = logging.getLogger(__name__)

# Define the module's virtual name
__virtualname__ = "lvm"


def __virtual__():
    """
    Only load the module if lvm is installed
    """
    if salt.utils.path.which("lvm"):
        return __virtualname__
    return (
        False,
        "The linux_lvm execution module cannot be loaded: the lvm binary is not in the path.",
    )


def version():
    """
    Return LVM version from lvm version

    CLI Example:

    .. code-block:: bash

        salt '*' lvm.version
    """
    cmd = "lvm version"
    out = __salt__["cmd.run"](cmd).splitlines()
    ret = out[0].split(": ")
    return ret[1].strip()


def fullversion():
    """
    Return all version info from lvm version

    CLI Example:

    .. code-block:: bash

        salt '*' lvm.fullversion
    """
    ret = {}
    cmd = "lvm version"
    out = __salt__["cmd.run"](cmd).splitlines()
    for line in out:
        comps = line.split(":")
        ret[comps[0].strip()] = comps[1].strip()
    return ret


def pvdisplay(pvname="", real=False, quiet=False):
    """
    Return information about the physical volume(s)

    pvname
        physical device name

    real
        dereference any symlinks and report the real device

        .. versionadded:: 2015.8.7

    quiet
        if the physical volume is not present, do not show any error

    CLI Examples:

    .. code-block:: bash

        salt '*' lvm.pvdisplay
        salt '*' lvm.pvdisplay /dev/md0
    """
    ret = {}
    cmd = ["pvdisplay", "-c"]
    if pvname:
        cmd.append(pvname)
    cmd_ret = __salt__["cmd.run_all"](cmd, python_shell=False, ignore_retcode=quiet)

    if cmd_ret["retcode"] != 0:
        return {}

    out = cmd_ret["stdout"].splitlines()
    for line in out:
        if "is a new physical volume" not in line:
            comps = line.strip().split(":")
            if real:
                device = os.path.realpath(comps[0])
            else:
                device = comps[0]
            ret[device] = {
                "Physical Volume Device": comps[0],
                "Volume Group Name": comps[1],
                "Physical Volume Size (kB)": comps[2],
                "Internal Physical Volume Number": comps[3],
                "Physical Volume Status": comps[4],
                "Physical Volume (not) Allocatable": comps[5],
                "Current Logical Volumes Here": comps[6],
                "Physical Extent Size (kB)": comps[7],
                "Total Physical Extents": comps[8],
                "Free Physical Extents": comps[9],
                "Allocated Physical Extents": comps[10],
            }
            if real:
                ret[device]["Real Physical Volume Device"] = device
    return ret


def vgdisplay(vgname="", quiet=False):
    """
    Return information about the volume group(s)

    vgname
        volume group name

    quiet
        if the volume group is not present, do not show any error

    CLI Examples:

    .. code-block:: bash

        salt '*' lvm.vgdisplay
        salt '*' lvm.vgdisplay nova-volumes
    """
    ret = {}
    cmd = ["vgdisplay", "-c"]
    if vgname:
        cmd.append(vgname)
    cmd_ret = __salt__["cmd.run_all"](cmd, python_shell=False, ignore_retcode=quiet)

    if cmd_ret["retcode"] != 0:
        return {}

    out = cmd_ret["stdout"].splitlines()
    for line in out:
        comps = line.strip().split(":")
        ret[comps[0]] = {
            "Volume Group Name": comps[0],
            "Volume Group Access": comps[1],
            "Volume Group Status": comps[2],
            "Internal Volume Group Number": comps[3],
            "Maximum Logical Volumes": comps[4],
            "Current Logical Volumes": comps[5],
            "Open Logical Volumes": comps[6],
            "Maximum Logical Volume Size": comps[7],
            "Maximum Physical Volumes": comps[8],
            "Current Physical Volumes": comps[9],
            "Actual Physical Volumes": comps[10],
            "Volume Group Size (kB)": comps[11],
            "Physical Extent Size (kB)": comps[12],
            "Total Physical Extents": comps[13],
            "Allocated Physical Extents": comps[14],
            "Free Physical Extents": comps[15],
            "UUID": comps[16],
        }
    return ret


def lvdisplay(lvname="", quiet=False):
    """
    Return information about the logical volume(s)

    lvname
        logical device name

    quiet
        if the logical volume is not present, do not show any error

    CLI Examples:

    .. code-block:: bash

        salt '*' lvm.lvdisplay
        salt '*' lvm.lvdisplay /dev/vg_myserver/root
    """
    ret = {}
    cmd = ["lvdisplay", "-c"]
    if lvname:
        cmd.append(lvname)
    cmd_ret = __salt__["cmd.run_all"](cmd, python_shell=False, ignore_retcode=quiet)

    if cmd_ret["retcode"] != 0:
        return {}

    out = cmd_ret["stdout"].splitlines()
    for line in out:
        comps = line.strip().split(":")
        ret[comps[0]] = {
            "Logical Volume Name": comps[0],
            "Volume Group Name": comps[1],
            "Logical Volume Access": comps[2],
            "Logical Volume Status": comps[3],
            "Internal Logical Volume Number": comps[4],
            "Open Logical Volumes": comps[5],
            "Logical Volume Size": comps[6],
            "Current Logical Extents Associated": comps[7],
            "Allocated Logical Extents": comps[8],
            "Allocation Policy": comps[9],
            "Read Ahead Sectors": comps[10],
            "Major Device Number": comps[11],
            "Minor Device Number": comps[12],
        }
    return ret


def pvcreate(devices, override=True, force=True, **kwargs):
    """
    Set a physical device to be used as an LVM physical volume

    override
        Skip devices, if they are already LVM physical volumes

    CLI Examples:

    .. code-block:: bash

        salt mymachine lvm.pvcreate /dev/sdb1,/dev/sdb2
        salt mymachine lvm.pvcreate /dev/sdb1 dataalignmentoffset=7s
    """
    if not devices:
        return "Error: at least one device is required"
    if isinstance(devices, str):
        devices = devices.split(",")

    cmd = ["pvcreate"]

    if force:
        cmd.append("--yes")
    else:
        cmd.append("-qq")

    for device in devices:
        if not os.path.exists(device):
            return "{} does not exist".format(device)
        if not pvdisplay(device, quiet=True):
            cmd.append(device)
        elif not override:
            return 'Device "{}" is already an LVM physical volume.'.format(device)

    if not cmd[2:]:
        # All specified devices are already LVM volumes
        return True

    valid = (
        "metadatasize",
        "dataalignment",
        "dataalignmentoffset",
        "pvmetadatacopies",
        "metadatacopies",
        "metadataignore",
        "restorefile",
        "norestorefile",
        "labelsector",
        "setphysicalvolumesize",
    )
    no_parameter = "norestorefile"
    for var in kwargs:
        if kwargs[var] and var in valid:
            cmd.extend(["--{}".format(var), kwargs[var]])
        elif kwargs[var] and var in no_parameter:
            cmd.append("--{}".format(var))

    out = __salt__["cmd.run_all"](cmd, python_shell=False)
    if out.get("retcode"):
        return out.get("stderr")

    # Verify pvcreate was successful
    for device in devices:
        if not pvdisplay(device):
            return 'Device "{}" was not affected.'.format(device)

    return True


def pvremove(devices, override=True, force=True):
    """
    Remove a physical device being used as an LVM physical volume

    override
        Skip devices, if they are already not used as LVM physical volumes

    CLI Examples:

    .. code-block:: bash

        salt mymachine lvm.pvremove /dev/sdb1,/dev/sdb2
    """
    if isinstance(devices, str):
        devices = devices.split(",")

    cmd = ["pvremove"]

    if force:
        cmd.append("--yes")
    else:
        cmd.append("-qq")

    for device in devices:
        if pvdisplay(device):
            cmd.append(device)
        elif not override:
            return "{} is not a physical volume".format(device)

    if not cmd[2:]:
        # Nothing to do
        return True

    out = __salt__["cmd.run_all"](cmd, python_shell=False)
    if out.get("retcode"):
        return out.get("stderr")

    # Verify pvremove was successful
    for device in devices:
        if pvdisplay(device, quiet=True):
            return 'Device "{}" was not affected.'.format(device)

    return True


def vgcreate(vgname, devices, force=False, **kwargs):
    """
    Create an LVM volume group

    CLI Examples:

    .. code-block:: bash

        salt mymachine lvm.vgcreate my_vg /dev/sdb1,/dev/sdb2
        salt mymachine lvm.vgcreate my_vg /dev/sdb1 clustered=y
    """
    if not vgname or not devices:
        return "Error: vgname and device(s) are both required"
    if isinstance(devices, str):
        devices = devices.split(",")

    cmd = ["vgcreate", vgname]
    for device in devices:
        cmd.append(device)

    if force:
        cmd.append("--yes")
    else:
        cmd.append("-qq")

    valid = (
        "addtag",
        "alloc",
        "autobackup",
        "clustered",
        "maxlogicalvolumes",
        "maxphysicalvolumes",
        "metadatatype",
        "vgmetadatacopies",
        "metadatacopies",
        "physicalextentsize",
        "zero",
    )
    for var in kwargs:
        if kwargs[var] and var in valid:
            cmd.append("--{}".format(var))
            cmd.append(kwargs[var])

    cmd_ret = __salt__["cmd.run_all"](cmd, python_shell=False)
    if cmd_ret.get("retcode"):
        out = cmd_ret.get("stderr").strip()
    else:
        out = 'Volume group "{}" successfully created'.format(vgname)

    vgdata = vgdisplay(vgname)
    vgdata["Output from vgcreate"] = out
    return vgdata


def vgextend(vgname, devices, force=False):
    """
    Add physical volumes to an LVM volume group

    CLI Examples:

    .. code-block:: bash

        salt mymachine lvm.vgextend my_vg /dev/sdb1,/dev/sdb2
        salt mymachine lvm.vgextend my_vg /dev/sdb1
    """
    if not vgname or not devices:
        return "Error: vgname and device(s) are both required"
    if isinstance(devices, str):
        devices = devices.split(",")

    cmd = ["vgextend", vgname]

    if force:
        cmd.append("--yes")
    else:
        cmd.append("-qq")

    for device in devices:
        cmd.append(device)

    cmd_ret = __salt__["cmd.run_all"](cmd, python_shell=False)
    if cmd_ret.get("retcode"):
        out = cmd_ret.get("stderr").strip()
    else:
        out = 'Volume group "{}" successfully extended'.format(vgname)

    vgdata = {"Output from vgextend": out}
    return vgdata


def lvcreate(
    lvname,
    vgname,
    size=None,
    extents=None,
    snapshot=None,
    pv=None,
    thinvolume=False,
    thinpool=False,
    force=False,
    **kwargs
):
    """
    Create a new logical volume, with option for which physical volume to be used

    CLI Examples:

    .. code-block:: bash

        salt '*' lvm.lvcreate new_volume_name     vg_name size=10G
        salt '*' lvm.lvcreate new_volume_name     vg_name extents=100 pv=/dev/sdb
        salt '*' lvm.lvcreate new_snapshot        vg_name snapshot=volume_name size=3G

    .. versionadded:: 0.12.0

    Support for thin pools and thin volumes

    CLI Examples:

    .. code-block:: bash

        salt '*' lvm.lvcreate new_thinpool_name   vg_name               size=20G thinpool=True
        salt '*' lvm.lvcreate new_thinvolume_name vg_name/thinpool_name size=10G thinvolume=True

    """
    if size and extents:
        return "Error: Please specify only one of size or extents"
    if thinvolume and thinpool:
        return "Error: Please set only one of thinvolume or thinpool to True"

    valid = (
        "activate",
        "chunksize",
        "contiguous",
        "discards",
        "stripes",
        "stripesize",
        "minor",
        "persistent",
        "mirrors",
        "noudevsync",
        "monitor",
        "ignoremonitoring",
        "permission",
        "poolmetadatasize",
        "readahead",
        "regionsize",
        "type",
        "virtualsize",
        "zero",
    )
    no_parameter = (
        "noudevsync",
        "ignoremonitoring",
        "thin",
    )

    extra_arguments = []
    if kwargs:
        for k, v in kwargs.items():
            if k in no_parameter:
                extra_arguments.append("--{}".format(k))
            elif k in valid:
                extra_arguments.extend(["--{}".format(k), "{}".format(v)])

    cmd = [salt.utils.path.which("lvcreate")]

    if thinvolume:
        cmd.extend(["--thin", "-n", lvname])
    elif thinpool:
        cmd.extend(["--thinpool", lvname])
    else:
        cmd.extend(["-n", lvname])

    if snapshot:
        cmd.extend(["-s", "{}/{}".format(vgname, snapshot)])
    else:
        cmd.append(vgname)

    if size and thinvolume:
        cmd.extend(["-V", "{}".format(size)])
    elif extents and thinvolume:
        return "Error: Thin volume size cannot be specified as extents"
    elif size:
        cmd.extend(["-L", "{}".format(size)])
    elif extents:
        cmd.extend(["-l", "{}".format(extents)])
    else:
        return "Error: Either size or extents must be specified"

    if pv:
        cmd.append(pv)
    if extra_arguments:
        cmd.extend(extra_arguments)

    if force:
        cmd.append("--yes")
    else:
        cmd.append("-qq")

    cmd_ret = __salt__["cmd.run_all"](cmd, python_shell=False)
    if cmd_ret.get("retcode"):
        out = cmd_ret.get("stderr").strip()
    else:
        out = 'Logical volume "{}" created.'.format(lvname)

    lvdev = "/dev/{}/{}".format(vgname, lvname)
    lvdata = lvdisplay(lvdev)
    lvdata["Output from lvcreate"] = out
    return lvdata


def vgremove(vgname, force=True):
    """
    Remove an LVM volume group

    CLI Examples:

    .. code-block:: bash

        salt mymachine lvm.vgremove vgname
        salt mymachine lvm.vgremove vgname force=True
    """
    cmd = ["vgremove", vgname]

    if force:
        cmd.append("--yes")
    else:
        cmd.append("-qq")

    cmd_ret = __salt__["cmd.run_all"](cmd, python_shell=False)
    if cmd_ret.get("retcode"):
        out = cmd_ret.get("stderr").strip()
    else:
        out = 'Volume group "{}" successfully removed'.format(vgname)
    return out


def lvremove(lvname, vgname, force=True):
    """
    Remove a given existing logical volume from a named existing volume group

    CLI Example:

    .. code-block:: bash

        salt '*' lvm.lvremove lvname vgname force=True
    """
    cmd = ["lvremove", "{}/{}".format(vgname, lvname)]

    if force:
        cmd.append("--yes")
    else:
        cmd.append("-qq")

    cmd_ret = __salt__["cmd.run_all"](cmd, python_shell=False)
    if cmd_ret.get("retcode"):
        out = cmd_ret.get("stderr").strip()
    else:
        out = 'Logical volume "{}" successfully removed'.format(lvname)

    return out


def lvresize(size=None, lvpath=None, extents=None, force=False, resizefs=False):
    """
    Resize a logical volume to specific size.

    CLI Examples:

    .. code-block:: bash


        salt '*' lvm.lvresize +12M /dev/mapper/vg1-test
        salt '*' lvm.lvresize lvpath=/dev/mapper/vg1-test extents=+100%FREE

    """
    if size and extents:
        log.error("Error: Please specify only one of size or extents")
        return {}

    cmd = ["lvresize"]

    if force:
        cmd.append("--force")
    else:
        cmd.append("-qq")

    if resizefs:
        cmd.append("--resizefs")

    if size:
        cmd.extend(["-L", "{}".format(size)])
    elif extents:
        cmd.extend(["-l", "{}".format(extents)])
    else:
        log.error("Error: Either size or extents must be specified")
        return {}

    cmd.append(lvpath)

    cmd_ret = __salt__["cmd.run_all"](cmd, python_shell=False)
    if cmd_ret.get("retcode"):
        out = cmd_ret.get("stderr").strip()
    else:
        out = 'Logical volume "{}" successfully resized.'.format(lvpath)

    return {"Output from lvresize": out}


def lvextend(size=None, lvpath=None, extents=None, force=False, resizefs=False):
    """
    Increase a logical volume to specific size.

    CLI Examples:

    .. code-block:: bash


        salt '*' lvm.lvextend +12M /dev/mapper/vg1-test
        salt '*' lvm.lvextend lvpath=/dev/mapper/vg1-test extents=+100%FREE

    """
    if size and extents:
        log.error("Error: Please specify only one of size or extents")
        return {}

    cmd = ["lvextend"]

    if force:
        cmd.append("--yes")
    else:
        cmd.append("-qq")

    if resizefs:
        cmd.append("--resizefs")

    if size:
        cmd.extend(["-L", "{}".format(size)])
    elif extents:
        cmd.extend(["-l", "{}".format(extents)])
    else:
        log.error("Error: Either size or extents must be specified")
        return {}

    cmd.append(lvpath)

    cmd_ret = __salt__["cmd.run_all"](cmd, python_shell=False)
    if cmd_ret.get("retcode"):
        out = cmd_ret.get("stderr").strip()
    else:
        out = 'Logical volume "{}" successfully extended.'.format(lvpath)

    return {"Output from lvextend": out}


def pvresize(devices, override=True, force=True):
    """
    Resize a LVM physical volume to the physical device size

    override
        Skip devices, if they are already not used as LVM physical volumes

    CLI Examples:

    .. code-block:: bash

        salt mymachine lvm.pvresize /dev/sdb1,/dev/sdb2
    """
    if isinstance(devices, str):
        devices = devices.split(",")

    cmd = ["pvresize"]

    if force:
        cmd.append("--yes")
    else:
        cmd.append("-qq")

    for device in devices:
        if pvdisplay(device):
            cmd.append(device)
        elif not override:
            return "{} is not a physical volume".format(device)

    if not cmd[2:]:
        # Nothing to do
        return True

    out = __salt__["cmd.run_all"](cmd, python_shell=False)
    if out.get("retcode"):
        return out.get("stderr")

    return True
