"""
Support for the Mercurial SCM
"""


import logging

import salt.utils.data
import salt.utils.path
from salt.exceptions import CommandExecutionError

log = logging.getLogger(__name__)


def __virtual__():
    """
    Only load if hg is installed
    """
    if salt.utils.path.which("hg") is None:
        return (False, "The hg execution module cannot be loaded: hg unavailable.")
    else:
        return True


def _ssh_flag(identity_path):
    return ["--ssh", "ssh -i {}".format(identity_path)]


def revision(cwd, rev="tip", short=False, user=None):
    """
    Returns the long hash of a given identifier (hash, branch, tag, HEAD, etc)

    cwd
        The path to the Mercurial repository

    rev: tip
        The revision

    short: False
        Return an abbreviated commit hash

    user : None
        Run hg as a user other than what the minion runs as

    CLI Example:

    .. code-block:: bash

        salt '*' hg.revision /path/to/repo mybranch
    """
    cmd = ["hg", "id", "-i", "--debug" if not short else "", "-r", "{}".format(rev)]

    result = __salt__["cmd.run_all"](cmd, cwd=cwd, runas=user, python_shell=False)

    if result["retcode"] == 0:
        return result["stdout"]
    else:
        return ""


def describe(cwd, rev="tip", user=None):
    """
    Mimic git describe and return an identifier for the given revision

    cwd
        The path to the Mercurial repository

    rev: tip
        The path to the archive tarball

    user : None
        Run hg as a user other than what the minion runs as

    CLI Example:

    .. code-block:: bash

        salt '*' hg.describe /path/to/repo
    """
    cmd = [
        "hg",
        "log",
        "-r",
        "{}".format(rev),
        "--template",
        "'{{latesttag}}-{{latesttagdistance}}-{{node|short}}'",
    ]
    desc = __salt__["cmd.run_stdout"](cmd, cwd=cwd, runas=user, python_shell=False)

    return desc or revision(cwd, rev, short=True)


def archive(cwd, output, rev="tip", fmt=None, prefix=None, user=None):
    """
    Export a tarball from the repository

    cwd
        The path to the Mercurial repository

    output
        The path to the archive tarball

    rev: tip
        The revision to create an archive from

    fmt: None
        Format of the resulting archive. Mercurial supports: tar,
        tbz2, tgz, zip, uzip, and files formats.

    prefix : None
        Prepend <prefix>/ to every filename in the archive

    user : None
        Run hg as a user other than what the minion runs as

    If ``prefix`` is not specified it defaults to the basename of the repo
    directory.

    CLI Example:

    .. code-block:: bash

        salt '*' hg.archive /path/to/repo output=/tmp/archive.tgz fmt=tgz
    """
    cmd = [
        "hg",
        "archive",
        "{}".format(output),
        "--rev",
        "{}".format(rev),
    ]
    if fmt:
        cmd.append("--type")
        cmd.append("{}".format(fmt))
    if prefix:
        cmd.append("--prefix")
        cmd.append('"{}"'.format(prefix))
    return __salt__["cmd.run"](cmd, cwd=cwd, runas=user, python_shell=False)


def pull(cwd, opts=None, user=None, identity=None, repository=None):
    """
    Perform a pull on the given repository

    cwd
        The path to the Mercurial repository

    repository : None
        Perform pull from the repository different from .hg/hgrc:[paths]:default

    opts : None
        Any additional options to add to the command line

    user : None
        Run hg as a user other than what the minion runs as

    identity : None
        Private SSH key on the minion server for authentication (ssh://)

        .. versionadded:: 2015.5.0

    CLI Example:

    .. code-block:: bash

        salt '*' hg.pull /path/to/repo opts=-u
    """
    cmd = ["hg", "pull"]
    if identity:
        cmd.extend(_ssh_flag(identity))
    if opts:
        for opt in opts.split():
            cmd.append(opt)
    if repository is not None:
        cmd.append(repository)

    ret = __salt__["cmd.run_all"](cmd, cwd=cwd, runas=user, python_shell=False)
    if ret["retcode"] != 0:
        raise CommandExecutionError(
            "Hg command failed: {}".format(ret.get("stderr", ret["stdout"]))
        )

    return ret["stdout"]


def update(cwd, rev, force=False, user=None):
    """
    Update to a given revision

    cwd
        The path to the Mercurial repository

    rev
        The revision to update to

    force : False
        Force an update

    user : None
        Run hg as a user other than what the minion runs as

    CLI Example:

    .. code-block:: bash

        salt devserver1 hg.update /path/to/repo somebranch
    """
    cmd = ["hg", "update", "{}".format(rev)]
    if force:
        cmd.append("-C")

    ret = __salt__["cmd.run_all"](cmd, cwd=cwd, runas=user, python_shell=False)
    if ret["retcode"] != 0:
        raise CommandExecutionError(
            "Hg command failed: {}".format(ret.get("stderr", ret["stdout"]))
        )

    return ret["stdout"]


def clone(cwd, repository, opts=None, user=None, identity=None):
    """
    Clone a new repository

    cwd
        The path to the Mercurial repository

    repository
        The hg URI of the repository

    opts : None
        Any additional options to add to the command line

    user : None
        Run hg as a user other than what the minion runs as

    identity : None
        Private SSH key on the minion server for authentication (ssh://)

        .. versionadded:: 2015.5.0

    CLI Example:

    .. code-block:: bash

        salt '*' hg.clone /path/to/repo https://bitbucket.org/birkenfeld/sphinx
    """
    cmd = ["hg", "clone", "{}".format(repository), "{}".format(cwd)]
    if opts:
        for opt in opts.split():
            cmd.append("{}".format(opt))
    if identity:
        cmd.extend(_ssh_flag(identity))

    ret = __salt__["cmd.run_all"](cmd, runas=user, python_shell=False)
    if ret["retcode"] != 0:
        raise CommandExecutionError(
            "Hg command failed: {}".format(ret.get("stderr", ret["stdout"]))
        )

    return ret["stdout"]


def status(cwd, opts=None, user=None):
    """
    Show changed files of the given repository

    cwd
        The path to the Mercurial repository

    opts : None
        Any additional options to add to the command line

    user : None
        Run hg as a user other than what the minion runs as

    CLI Example:

    .. code-block:: bash

        salt '*' hg.status /path/to/repo
    """

    def _status(cwd):
        cmd = ["hg", "status"]
        if opts:
            for opt in opts.split():
                cmd.append("{}".format(opt))
        out = __salt__["cmd.run_stdout"](cmd, cwd=cwd, runas=user, python_shell=False)
        types = {
            "M": "modified",
            "A": "added",
            "R": "removed",
            "C": "clean",
            "!": "missing",
            "?": "not tracked",
            "I": "ignored",
            " ": "origin of the previous file",
        }
        ret = {}
        for line in out.splitlines():
            t, f = types[line[0]], line[2:]
            if t not in ret:
                ret[t] = []
            ret[t].append(f)
        return ret

    if salt.utils.data.is_iter(cwd):
        return {cwd: _status(cwd) for cwd in cwd}
    else:
        return _status(cwd)
