# -*- coding: utf-8 -*-

# Copyright 2008-2016 Mir Calculate. http://www.calculate-linux.org
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

import os
import sys
from os import path
import re
import operator
from operator import itemgetter
from calculate.lib.datavars import (Variable, VariableError, ReadonlyVariable,
                                    CommonVariableError)
from calculate.lib.utils.common import (getSupportArch, getTupleVersion,
                                        cmpVersion)
from calculate.lib.utils.files import listDirectory, pathJoin
from calculate.lib.variables.linux import Linux
from calculate.install.distr import (Distributive, PartitionDistributive,
                                     DirectoryDistributive, DefaultMountPath,
                                     DistributiveError, FlashDistributive,
                                     MultiPartitions, PxeDistributive)

from calculate.lib.cl_lang import setLocalTranslate, _
from calculate.install.fs_manager import FileSystemManager

setLocalTranslate('cl_install3', sys.modules[__name__])


class DistroRepository(Linux):
    contentCache = {}

    marches = ['i686', 'x86_64']

    extensiton = ['iso', 'tar.bz2', 'tar.gz', 'tar.7z', 'tar.lzma']

    reDistName = re.compile("""
                ^.*/(?P<os_linux_shortname>%(name)s)
                -(?P<os_linux_ver>%(ver)s)
                (?:-(?P<serial_id>%(ser)s))?
                -(?P<os_arch_machine>%(march)s)
                .(?P<ext>%(ext)s)$""" %
                            {'name': "[a-z0-9]+",
                             'ver': r"(\d+\.)*\d+",
                             'ser': r"\d+",
                             'march': "|".join(marches),
                             'ext': "|".join(extensiton)
                             }, re.X)

    def _getDistrInfo(self, filename):
        """Get information by distributive"""
        # if filename is directory
        if not path.isfile(filename):
            return Distributive().getInfo(filename)
        else:
            match = self.reDistName.match(filename)
            if not match:
                return {}
            distdic = match.groupdict()
            distdic["os_linux_build"] = ""
            if "os_linux_ver" in distdic:
                if re.match("^\d{8}$", distdic["os_linux_ver"]):
                    distdic["os_linux_build"] = distdic["os_linux_ver"]
                    distdic["os_linux_ver"] = ""
            return distdic

    def getImage(self, scratch, rootType, imagePath, march=None,
                 shortName=None, linuxVer=None, linuxBuild=None):
        """Get image by parameters"""
        # exclude directory distributive for flash and scratch install
        if scratch == "on" or rootType == "flash":
            discardType = ["dir"]
        else:
            discardType = []
        return self.getBestDistributive(imagePath,
                                        march=march,
                                        shortname=shortName,
                                        discardType=discardType,
                                        version=linuxVer,
                                        build=linuxBuild)

    def _getAvailableShortnames(self, dirs):
        """Get available distributives shortnames"""
        distros = filter(lambda x: x,
                         map(self.reDistName.search,
                             self._getAvailableDistributives(dirs)))
        return sorted(list(set(map(lambda x: x.groupdict()['name'], distros))))

    def opcompareByString(self, buf):
        if buf:
            reOp = re.compile("^(!=|=|==|<=|>=|>|<)?(\d+.*)$")
            res = reOp.search(buf)
            if res:
                return ({'!=': operator.ne,
                         '=': operator.eq,
                         '==': operator.eq,
                         '>=': operator.ge,
                         '<=': operator.le,
                         '<': operator.lt,
                         '>': operator.gt}.get(res.group(1), operator.eq),
                        res.group(2))
            else:
                return operator.eq, buf
        return None, None

    def _getAvailableDistributives(self, dirs, system=None, shortname=None,
                                   march=None, version=None, build=None):
        """Get all distributives by filter"""

        def systemByName(name):
            return self.dictNameSystem.get(name.upper(), "")

        verCmp, version = self.opcompareByString(version)
        if version:
            version = getTupleVersion(version)
        buildCmp, build = self.opcompareByString(build)
        if build and build.isdigit():
            build = int(build)

        def distfilter(dist):
            d = self._getDistrInfo(dist)
            if not d:
                return False
            # check filter conditions
            if system and systemByName(d['os_linux_shortname']) != system:
                return False
            if "os_linux_shortname" not in d or "os_linux_ver" not in d:
                return False
            if (shortname and
                        d['os_linux_shortname'].lower() != shortname.lower()):
                return False
            if march and d['os_arch_machine'] != march:
                return False
            if version and \
                    not verCmp(getTupleVersion(d['os_linux_ver']), version):
                return False
            if build and "os_linux_build" in d and \
                    (not d['os_linux_build'].isdigit() or
                         not buildCmp(int(d['os_linux_build']), build)):
                return False
            return True

        def listdistr(pathname):
            if path.exists(path.join(pathname, 'etc/make.profile')) or \
                    path.exists(
                        path.join(pathname, 'etc/portage/make.profile')) or \
                    path.exists(path.join(pathname, 'livecd')) or \
                    pathname.startswith('/dev/'):
                return [pathname]
            else:
                # discard inner directories
                return filter(lambda x: not path.isdir(path.join(pathname, x)),
                              listDirectory(pathname))

        # get lists files in directories
        allFiles = map(lambda x: map(lambda y: path.join(x, y),
                                     listdistr(x)),
                       dirs)
        # filter distributives
        return filter(distfilter,
                      # join files lists to one list
                      reduce(lambda x, y: x + y,
                             allFiles, []))

    def extcomparator(self, *exts):
        """Compare extensions"""
        mapExts = {'iso': 0,
                   'flash': -1,
                   'isodir': -2,
                   'partdir': -3,
                   'dir': -4}
        return cmp(mapExts.get(exts[0], -4), mapExts.get(exts[1], -4))

    def sortdistrfunc(self, x, y):
        """Func of comparing two distributive"""
        ver1, ver2 = x[1].get('os_linux_ver', ""), y[1].get('os_linux_ver', "")
        if ver1 and ver2 and ver1 != "0" and ver2 != "0" and ver1 != ver2:
            return cmpVersion(ver1, ver2)
        build1 = getTupleVersion(x[1].get('os_linux_build', ""))
        build2 = getTupleVersion(y[1].get('os_linux_build', ""))
        if build1 != build2:
            return cmp(build1, build2)
        else:
            ser1, ser2 = (x[1].get('serial_id') or "0",
                          y[1].get('serial_id') or "0")
            if ser1 != ser2:
                return cmp(int(ser1), int(ser2))
            ext1 = x[1].get('ext', "")
            ext2 = y[1].get('ext', "")
            return self.extcomparator(ext1, ext2)

    def getAvailableDristibutives(self, dirs, system=None, shortname=None,
                                  march=None, version=None, build=None,
                                  discardType=()):
        """Get list available distributives"""
        if shortname:
            shortname = shortname.lower()
        availDistrs = self._getAvailableDistributives(dirs, system, shortname,
                                                      march, version,
                                                      build)
        availDistrs = filter(lambda x: x[1] and "ext" in x[1] and
                                       not x[1]["ext"] in discardType,
                             map(lambda x: (x, self._getDistrInfo(x)),
                                 availDistrs))
        return map(lambda x: x[0],
                   sorted(availDistrs, self.sortdistrfunc, reverse=True))

    def getBestDistributive(self, dirs, system=None, shortname=None, march=None,
                            version=None, build=None, discardType=()):
        """Get the actualest distributive"""
        availDistrs = self.getAvailableDristibutives(dirs, system, shortname,
                                                     march, version, build,
                                                     discardType)
        if availDistrs:
            return availDistrs[0]
        else:
            return None

    def _findLatestFile(self, dirs, reMatch, keyfunc):
        """Find latest file in dirs, which match by reMatch,
        comparable part get by keyfunc"""
        existsdirs = filter(path.exists, dirs)
        listimgs = reduce(lambda x, y: x + map(
            lambda x: reMatch.search(
                path.join(y, x)),
            listDirectory(y)),
                          existsdirs, [])
        listimgs = filter(lambda x: x, listimgs)
        if listimgs:
            return max(listimgs, key=keyfunc).group()
        return ""

    def getBestStage(self, dirs, march=None, hardened=None):
        """Get latest stage by march"""
        if march:
            march = {'x86_64': 'amd64'}.get(march, march)
        else:
            march = "[^-]+"
        if hardened is None:
            hardened = "(?:-hardened)?"
        elif hardened is True:
            hardened = "-hardened"
        elif hardened is False:
            hardened = ""
        reStage = re.compile(r'^.*/stage3-%s%s-(\d+)\.tar\.bz2$' %
                             (march, hardened), re.S)
        return self._findLatestFile(dirs, reStage, lambda x: x.groups()[0])


class VariableClImage(ReadonlyVariable):
    """
    System image for installation
    """
    type = "object"

    def get(self):
        """Get image file from distributive repository"""
        try:
            action = self.Get('cl_action')
            if not action in ('system',):
                return Distributive.fromFile('/')
            filename = self.Get('cl_image_filename')
            if filename:
                filename = Distributive.fromFile(filename)
        except DistributiveError as e:
            return ""
        return filename

    def humanReadable(self):
        filename = self.Get('cl_image')
        if filename:
            return filename.getType()
        return filename


class VariableClImageFilename(DistroRepository, Variable):
    """
    Distributive image filename
    """
    type = 'file'
    element = 'file'
    metavalue = "IMAGE"
    opt = ['--iso']
    check_after = ["os_install_root_type"]
    untrusted = True

    def init(self):
        self.label = _("Installation image")
        self.help = _("ISO image for installation")

    def get(self):
        if self.Get('cl_action') != 'system':
            return ""
        arch = self.Get('cl_image_arch_machine') or self.Get('os_arch_machine')
        shortname = self.Get('cl_image_linux_shortname') or \
                    self.Get('os_linux_shortname')
        ver = self.Get('cl_image_linux_ver') or None
        build = self.Get('cl_image_linux_build') or None
        return self.getImage(self.Get('os_install_scratch'),
                             self.Get('os_install_root_type'),
                             self.Get('cl_image_path'),
                             arch, shortname, ver, build) or ""

    def check(self, isoimage):
        """Set image file"""
        if self.Get('cl_action') == 'system' and not isoimage:
            raise VariableError(_("You need to select a distribution image"))
        imageData = Distributive().getInfo(isoimage)
        if not ("os_linux_shortname" in imageData and
                    imageData.get('os_linux_build', '') and
                        "os_arch_machine" in imageData):
            raise VariableError(_("Wrong image file"))

    def humanImageName(self, distroinfo, filepath):
        if all(x in distroinfo for x in ("os_linux_shortname",
                                         "os_arch_machine",
                                         "os_linux_build")):
            distroinfo['os_linux_shortname'] = \
                distroinfo['os_linux_shortname'].upper()
            fullname = distroinfo.get('os_linux_name',
                                      Linux.dictLinuxName.get(
                                          distroinfo['os_linux_shortname'],
                                          "Calculate"))
            subname = distroinfo.get('os_linux_subname',
                                     Linux.dictLinuxSubName.get(
                                         distroinfo['os_linux_shortname'], ""))
            if subname:
                subname = " %s" % subname
            build = distroinfo['os_linux_build'] or \
                    distroinfo.get('os_linux_ver', '')
            ver = distroinfo.get('os_linux_ver', '')
            return "{fullname} {os_arch_machine} {build}".format(
                fullname="%s%s" % (fullname, subname), filepath=filepath,
                build=build, ver=ver, **distroinfo)
        else:
            return filepath

    def humanReadable(self):
        fullname = self.Get('os_install_linux_name')
        subname = self.Get('os_install_linux_subname')
        if subname:
            subname = " %s" % subname
        arch = self.Get('os_install_arch_machine')
        build = self.Get('os_install_linux_build')
        ver = self.Get('os_install_linux_ver')

        return "{fullname} {ver} {arch} {build}".format(
            fullname="%s%s" % (fullname, subname),
            build=build, ver=ver, arch=arch)

    def choice(self):
        scratch = self.Get('os_install_scratch')
        rootType = self.Get('os_install_root_type')
        imagePath = self.Get('cl_image_path')
        if scratch == "on" or rootType == "flash" or \
                        self.Get('cl_install_type') == 'flash':
            discardType = ["dir"]
        else:
            discardType = []
        distros = self.getAvailableDristibutives(imagePath,
                                                 discardType=discardType)
        if self.wasSet and not self.value in distros:
            distros.append(self.value)
        return sorted(map(lambda x: (
            x, self.humanImageName(self._getDistrInfo(x), x)), distros),
                      key=itemgetter(1))


class VariableClImageArchMachine(DistroRepository, Variable):
    """
    Filter by architecture
    """
    value = ""
    type = 'choice'
    opt = ['--march']
    metavalue = "ARCH"
    available_arch = ["i686", "x86_64"]

    def init(self):
        self.label = "%s %s" % (_("Filter"), _("by processor architecture"))
        self.help = _("select the processor architecture")

    def set(self, march):
        if march == "auto":
            march = getSupportArch()[-1]
        return march

    def choice(self):
        return [("", _("Not used"))] + \
               [("auto", _("Auto"))] + \
               [(x, x) for x in self.available_arch]

    def humanReadable(self):
        return self.Get() or _("Not used")


class VariableClImageLinuxShortname(DistroRepository, Variable):
    """
    Filter by shortname
    """
    value = ""
    type = 'choiceedit'
    metavalue = "SYSTEM"
    opt = ['--os', '-s']

    def init(self):
        self.label = "%s %s" % (_("Filter"), _("by distribution"))
        self.help = _("select the operation system")

    def choice(self):
        return [("", _("Not used"))] + \
               sorted(map(lambda x: (x, self.getFullNameByShort(x)),
                          self.dictLinuxName.keys()),
                      key=itemgetter(1))

    def humanReadable(self):
        return self.Get() or _("Not used")


class VariableClImageLinuxVer(DistroRepository, Variable):
    """
    Filter by version
    """
    value = ""

    def init(self):
        self.label = "%s %s" % (_("Filter"), _("by version"))
        self.help = _("select the operation system by version")

    def humanReadable(self):
        return self.Get() or _("Not used")


class VariableClImageLinuxBuild(DistroRepository, Variable):
    """
    Filter by build
    """
    value = ""

    def init(self):
        self.label = "%s %s" % (_("Filter"), _("by build"))
        self.help = _("select the operation system by build")

    def humanReadable(self):
        return self.Get() or _("Not used")


class VariableClImagePath(ReadonlyVariable):
    """
    Image search path
    """
    type = "list"

    def get(self):
        # if current distributive is live
        if self.Get('os_root_type') == "livecd":
            # if builder from flash then this source path '/mnt/flash'
            # may be this path will be '/mnt/builder' for install 
            # modified system
            if self.Get('os_scratch') == "on" and path.exists('/mnt/flash'):
                livedistr = ['/mnt/flash']
            # if system boot with kernel param 'docache'
            elif path.exists('/mnt/squash'):
                livedistr = ['/mnt/livecd']
            # standard livecd
            else:
                if self.Get('os_install_root_type') == "flash":
                    livedistr = ['/run/initramfs/live',
                                 '/run/initramfs/squashfs',
                                 '/mnt/cdrom']
                else:
                    livedistr = ['/run/initramfs/squashfs',
                                 '/run/initramfs/live',
                                 '/mnt/cdrom']
                livedistr = filter(listDirectory,
                                   livedistr)[:1]
        else:
            livedistr = []
        # search all partition for source installation distributive
        rootDev = self.Get('os_install_root_dev')
        livedistr += \
            map(lambda x: x[0],
                filter(lambda x: " live" in x[1] and x[0] != rootDev,
                       zip(self.Get('os_disk_dev'),
                           self.Get('os_disk_content'))))
        # add to standard path 
        return filter(path.exists,
                      ['/var/calculate/remote/linux',
                       '/var/calculate/linux'] + livedistr)


class VariableClSource(ReadonlyVariable):
    """
    Дистрибутив текущей системы
    """
    type = "object"

    def get(self):
        return DirectoryDistributive('/')


class VariableClTarget(ReadonlyVariable):
    """
    Target distributive
    """
    type = "object"

    def get(self):
        listVars = ['os_install_disk_dev', 'os_install_disk_mount',
                    'os_install_disk_format', 'os_install_disk_perform_format',
                    'os_install_disk_part', 'os_install_disk_id']
        rootLabel = "{short}-{ver}".format(
            short=self.Get('os_install_linux_shortname'),
            ver=self.Get('os_install_linux_ver'))

        if self.Get('os_install_root_type') == "flash":
            flashLabel = "{short}-{build}".format(
                short="CL", build=self.Get('os_install_linux_build'))
            disk = self.Get('os_install_disk_single')
            fileSystem = "vfat"
            systemId = FileSystemManager.supportFS.get(
                'vfat', {}).get('msdos', '0b')
            isFormat = self.GetBool('os_install_format_single_set')
            partTable = self.select('os_disk_part',
                                    os_disk_dev=disk, limit=1)
            return FlashDistributive(
                disk, mdirectory=DefaultMountPath.InstallMount,
                check=True, fileSystem=fileSystem,
                isFormat=isFormat, systemId=systemId,
                rootLabel=flashLabel,
                partitionTable=partTable)
        osInstallScratch = self.isTrue(self.Get('os_install_scratch'))
        mapDevId = dict(self.ZipVars('os_disk_dev', 'os_disk_id'))
        disk, mount, fileSystem, isFormat, partTable, systemId = \
            self.Select(listVars,
                        where='os_install_disk_mount',
                        eq='/', limit=1)
        if not systemId or mapDevId.get(disk, '') == systemId:
            systemId = None
        if osInstallScratch:
            raise VariableError("Scratch is not supported")
        if self.Get('os_install_pxe') == "on":
            return PxeDistributive(self.Get('os_install_pxe_path'))
        else:
            target = PartitionDistributive(
                disk, mdirectory=DefaultMountPath.InstallMount,
                check=True, fileSystem=fileSystem,
                rootLabel=rootLabel,
                isFormat=self.isTrue(isFormat),
                systemId=systemId,
                partitionTable=partTable)
        multiPartition = None
        diskData = self.Select(listVars,
                               where='os_install_disk_mount',
                               ne='/')
        bindData = self.Select(['os_install_bind_path',
                                'os_install_bind_mountpoint'],
                               where='os_install_bind_mountpoint',
                               ne='')
        if diskData or bindData:
            multiPartition = MultiPartitions()
            target.multipartition = multiPartition
        for disk, mount, fileSystem, isFormat, partTable, systemId in diskData:
            if not systemId or mapDevId.get(disk, '') == systemId:
                systemId = None
            multiPartition.addPartition(dev=disk,
                                        mountPoint=mount,
                                        fileSystem=fileSystem,
                                        isFormat=self.isTrue(isFormat),
                                        systemId=systemId,
                                        partitionTable=partTable)
        for source, dest in bindData:
            multiPartition.addPartition(dev=source,
                                        mountPoint=dest,
                                        fileSystem='bind',
                                        isFormat=False,
                                        systemId=None,
                                        partitionTable='')
        return target


class VariableClImageNewOnly(Variable):
    """
    Distributive image filename
    """
    type = 'bool'
    opt = ['-U', '--update']
    value = "off"

    def init(self):
        self.label = _("Install the newer image only")
        self.help = _("install the newer image only")

    def installedBuild(self):
        """
        Get build already installed system
        Need for check update
        """
        rootDev = self.Get('os_install_root_dev')
        if not rootDev:
            return ""
        try:
            imageData = Distributive().getInfo(rootDev)
            return imageData.get('os_linux_build', '')
        except Exception:
            pass
        return ""

    def check(self, value):
        if value == 'on':
            try:
                imageData = Distributive().getInfo(
                    self.Get('cl_image_filename'))
            except Exception as e:
                raise VariableError(_("Wrong image file"))
            if imageData.get('os_linux_build', '') <= \
                    self.Get('os_linux_build') or \
                            imageData.get('os_linux_build',
                                          '') <= self.installedBuild():
                raise CommonVariableError(_("The image for update not found"))


class VariableClInstallPathFrom(ReadonlyVariable):
    """
    Путь из устанавливаемой системы до устанавливающий системы
    """

    def get(self):
        template_path = pathJoin(self.Get('cl_chroot_path'),
                                 self.Get('cl_root_path'))
        return os.path.relpath("/", template_path)
