# -*- coding: utf-8 -*-
#
# livecd.py
#
# Copyright (C) 2010 Fabio Erculiani
# Copyright (C) 2011 wiktor w brodlo
# Copyright (C) 2011 Gentoo Foundation
#
# 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, see <http://www.gnu.org/licenses/>.
#

# System imports
import os
import statvfs
import subprocess
import commands
import stat
import time
import shutil

import gettext
_ = lambda x: gettext.ldgettext("anaconda", x)

# Anaconda imports
import storage
import flags
from constants import productPath as PRODUCT_PATH, productName as PRODUCT_NAME, \
    DISPATCH_BACK
import backend
import isys
import iutil
import logging
from anaconda_log import PROGRAM_LOG_FILE
import gentoo.utils
from gentoo import Portage 

log = logging.getLogger("anaconda")

class LiveCDCopyBackend(backend.AnacondaBackend):

    def __init__(self, anaconda):
        backend.AnacondaBackend.__init__(self, anaconda)
        flags.livecdInstall = True
        self.supportsUpgrades = True
        self.supportsPackageSelection = False
        self._root = anaconda.rootPath

        self.osimg = anaconda.methodstr[8:]
        # On Gentoo we're using a stage3 as an installation source
        # FIXME: Replace this with checking for stage3
        #if not os.path.ismount(self.osimg):
        #    anaconda.intf.messageWindow(_("Unable to find image"),
        #       _("The given location [%s] isn't a valid %s "
        #         "live CD to use as an installation source.")
        #       %(self.osimg, PRODUCT_NAME), type = "custom",
        #       custom_icon="error",
        #       custom_buttons=[_("Exit installer")])
        #    raise SystemExit(1)

    # _getLiveSize() needs to be adjusted but more measurements are needed
    def _getLiveSize(self):
        #st = os.statvfs(PRODUCT_PATH)
        compressed_byte_size = 150000000 #st.f_blocks * st.f_bsize
        return compressed_byte_size * 3 # 3 times is enough

    def _getLiveSizeMB(self):
        return self._getLiveSize() / 1048576

    def postAction(self, anaconda):
        try:
            anaconda.storage.umountFilesystems(swapoff = False)
            os.rmdir(self._root)
        except Exception, e:
            log.error("Unable to unmount filesystems: %s" % e)

    def checkSupportedUpgrade(self, anaconda):
        if anaconda.dir == DISPATCH_BACK:
            return

    def doPreInstall(self, anaconda):
        self._progress = gentoo.utils.GentooProgress(anaconda)
        self._progress.start()
        self._gentoo_install = gentoo.utils.GentooInstall(anaconda)
        # We use anaconda.upgrade as bootloader recovery step
        self._bootloader_recovery = anaconda.upgrade
        self._install_grub = not self.anaconda.dispatch.stepInSkipList("instbootloader")

    def doInstall(self, anaconda):

        # Disable internal Anaconda bootloader setup, doesn't support GRUB2
        anaconda.dispatch.skipStep("instbootloader", skip = 1)

        if self._bootloader_recovery:
            log.info("Preparing to recover Gentoo")
            self._progress.set_label(_("Recovering Gentoo."))
            self._progress.set_fraction(0.0)
            return
        else:
            log.info("Preparing to install Gentoo")

        self._progress.set_label(_("Installing Gentoo onto hard drive."))
        self._progress.set_fraction(0.0)
        
        # Actually install
        self._gentoo_install.live_install()
        
        # Now copy the portage tree
        self._gentoo_install.copy_portage()
        self._gentoo_install.set_profile()
        self._gentoo_install.write_makeconf()
        self._gentoo_install.install_setup_tools()
        
        self._gentoo_install.install_kernel()
        
        action = _("Configuring Gentoo")
        self._progress.set_label(action)
        self._progress.set_fraction(0.0)
        
        self._gentoo_install.setup_users()
        self._gentoo_install.setup_language() # before ldconfig, thx
        self._progress.set_fraction(0.1)
        # if simple networking is enabled, disable NetworkManager
        if self.anaconda.instClass.simplenet:
            self._gentoo_install.setup_manual_networking()
        else:
            self._gentoo_install.setup_networkmanager_networking()
        self._gentoo_install.setup_keyboard()
        self._progress.set_fraction(0.2)
        self._gentoo_install.setup_sudo()
        self._gentoo_install.setup_audio()
        self._progress.set_fraction(0.3)
        self._gentoo_install.setup_xorg()
        #self._gentoo_install.remove_proprietary_drivers()
        # TODO: This needs to be tried and fixed properly on Gentoo once installing X works
        #try:
        #    self._gentoo_install.setup_nvidia_legacy()
        #except Exception as e:
        #    # caused by Entropy bug <0.99.47.2, remove in future
        #    log.error("Unable to install legacy nvidia drivers: %s" % e)

        self._gentoo_install.configure_services()
        self._progress.set_fraction(0.4)
        self._gentoo_install.copy_udev()
        self._gentoo_install.env_update()
        self._progress.set_fraction(0.5)
        self._gentoo_install.spawn_chroot("locale-gen", silent = True)
        self._gentoo_install.spawn_chroot("ldconfig")
        self._progress.set_fraction(0.6)
        # Fix a possible /tmp problem
        self._gentoo_install.spawn("chmod a+w "+self._root+"/tmp")
        var_tmp = self._root + "/var/tmp"
        if not os.path.isdir(var_tmp): # wtf!
            os.makedirs(var_tmp)
        var_tmp_keep = os.path.join(var_tmp, ".keep")
        if not os.path.isfile(var_tmp_keep):
            with open(var_tmp_keep, "w") as wt:
                wt.flush()

        self._progress.set_fraction(0.7)
        self._gentoo_install.install_systools()
        action = _("Gentoo configuration complete")
        self._progress.set_label(action)
        self._progress.set_fraction(1.0)

    def doPostInstall(self, anaconda):

        #self._gentoo_install.setup_portage_mirrors()
        #self._gentoo_install.language_packs_install()
        self._gentoo_install.emit_install_done()

        storage.writeEscrowPackets(anaconda)

        self._gentoo_install.destroy()

        #const_kill_threads() #entropy leftover
        anaconda.intf.setInstallProgressClass(None)

    def writeConfiguration(self):
        """
        System configuration is written in anaconda.write().
        Add extra config files setup here.
        """

        # Write critical configuration not automatically written
        self.anaconda.storage.fsset.write()

        log.info("Do we need to run GRUB2 setup? => %s" % (self._install_grub,))

        if self._install_grub:

            # HACK: since Anaconda doesn't support grub2 yet
            # Grub configuration is disabled
            # and this code overrides it
            encrypted, root_crypted, swap_crypted = self._setup_grub2()
            if encrypted:
                if swap_crypted:
                    swap_name, swap_dev = swap_crypted
                    old_swap_name = swap_dev._name
                    swap_dev._name = swap_name
                if root_crypted:
                    root_name, root_dev = root_crypted
                    old_root_name = root_dev._name
                    if root_name == "root": # comes from /dev/mapper/root
                        root_dev._name = root_name
                # HACK: since swap device path value is potentially changed
                # it is required to rewrite the fstab (circular dependency, sigh)
                self.anaconda.storage.fsset.write()
                if swap_crypted:
                    swap_dev._name = old_swap_name
                if root_crypted:
                    root_dev._name = old_root_name

        self._copy_logs()

    def _copy_logs(self):

        # copy log files into chroot
        isys.sync()
        config_files = ["/tmp/anaconda.log", "/tmp/lvmout", "/tmp/resize.out",
             "/tmp/program.log", "/tmp/storage.log", "/tmp/emerge-fail.log"]
        install_dir = self._root + "/var/log/installer"
        if not os.path.isdir(install_dir):
            os.makedirs(install_dir)
        for config_file in config_files:
            if not os.path.isfile(config_file):
                continue
            dest_path = os.path.join(install_dir, os.path.basename(config_file))
            shutil.copy2(config_file, dest_path)

    def _get_bootloader_args(self):

        cmdline = open("/proc/cmdline", "r").read().strip().split()

        # keymaps genkernel vs system map
        keymaps_map = {
            'azerty': 'azerty',
            'be-latin1': 'be',
            'bg_bds-utf8': 'bg',
            'br-abnt2': 'br-a',
            'by': 'by',
            'cf': 'cf',
            'croat': 'croat',
            'cz-lat2': 'cz',
            'de': 'de',
            'dk': 'dk',
            'es': 'es',
            'et': 'et',
            'fi': 'fi',
            'fr-latin9': 'fr',
            'gr': 'gr',
            'hu': 'hu',
            'is-latin1': 'is',
            'it': 'it',
            'jp106': 'jp',
            'mk': 'mk',
            'nl': 'nl',
            'no': 'no',
            'pl2': 'pl',
            'pt-latin1': 'pt',
            'ro': 'ro',
            'ru': 'ru',
            'sk-qwerty': 'sk-y',
            'slovene': 'slovene',
            'trq': 'trq',
            'ua-utf': 'ua',
            'uk': 'uk',
            'us': 'us',
        }
        console_kbd, xxx, yyy, zzz = self._gentoo_install.get_keyboard_layout()
        gk_kbd = keymaps_map.get(console_kbd)

        # look for kernel arguments we know should be preserved and add them
        ourargs = ["speakup_synth=", "apic", "noapic", "apm=", "ide=", "noht",
            "acpi=", "video=", "vga=", "init=", "splash=", "console=",
            "pci=routeirq", "irqpoll", "nohdparm", "pci=", "floppy.floppy=",
            "all-generic-ide", "gentoo=", "res=", "hsync=", "refresh=", "noddc",
            "xdriver=", "onlyvesa", "nvidia=", "dodmraid", "dmraid",
            "gentoomce", "quiet", "scandelay=", "doslowusb", "docrypt",
            "dokeymap", "keymap=", "radeon.modeset=", "modeset=", "nomodeset"]

        # Setup genkernel (init) keyboard layout
        if gk_kbd is not None:
            if "dokeymap" not in cmdline:
                cmdline.append("dokeymap")
                cmdline.append("keymap=%s" % (gk_kbd,))

        # setup USB parameters, if installing on USB
        root_is_removable = getattr(self.anaconda.storage.rootDevice,
            "removable", False)
        if root_is_removable:
            cmdline.append("scandelay=10")

        previous_vga = None
        final_cmdline = []
        for arg in cmdline:
            for check in ourargs:
                if arg.startswith(check):
                    final_cmdline.append(arg)
                    if arg.startswith("vga="):
                        if previous_vga in final_cmdline:
                            final_cmdline.remove(previous_vga)
                        previous_vga = arg

        fsset = self.anaconda.storage.fsset
        swap_devices = fsset.swapDevices
        # <storage.devices.Device> subclass
        root_device = self.anaconda.storage.rootDevice
        # device.format.mountpoint, device.format.type, device.format.mountable,
        # device.format.options, device.path, device.fstabSpec
        root_crypted = False
        swap_crypted = False
        delayed_crypt_swap = None

        if swap_devices:
            log.info("Found swap devices: %s" % (swap_devices,))
            swap_dev = swap_devices[0]

            swap_crypto_dev = None
            for name in fsset.cryptTab.mappings.keys():
                swap_crypto_dev = fsset.cryptTab[name]['device']
                if swap_dev == swap_crypto_dev or swap_dev.dependsOn(
                    swap_crypto_dev):
                    swap_crypted = True
                    break

            if swap_crypted:
                # genkernel hardcoded bullshit, cannot change /dev/mapper/swap
                # change inside swap_dev, fstabSpec should return /dev/mapper/swap
                swap_crypted = ("swap", swap_dev)
                final_cmdline.append("resume=swap:%s" % (swap_dev.path,))
                final_cmdline.append("real_resume=%s" % (swap_dev.path,))
                # NOTE: cannot use swap_crypto_dev.fstabSpec because
                # genkernel doesn't support UUID= on crypto
                delayed_crypt_swap = swap_crypto_dev.path
            else:
                final_cmdline.append("resume=swap:%s" % (swap_dev.fstabSpec,))
                final_cmdline.append("real_resume=%s" % (swap_dev.fstabSpec,))

        # setup LVM
        lvscan_out = commands.getoutput("LANG=C LC_ALL=C lvscan").split("\n")[0].strip()
        if not lvscan_out.startswith("No volume groups found"):
            final_cmdline.append("dolvm")

        crypto_dev = None
        for name in fsset.cryptTab.mappings.keys():
            crypto_dev = fsset.cryptTab[name]['device']
            if root_device == crypto_dev or root_device.dependsOn(crypto_dev):
                root_crypted = True
                break

        def is_parent_a_simple_device(root_device):
            if not hasattr(root_device, 'parents'):
                return False
            for parent in root_device.parents:
                if not isinstance(parent, storage.devices.PartitionDevice):
                    return False
            return True

        def is_parent_a_md_device(root_device):
            if not hasattr(root_device, 'parents'):
                return False
            for parent in root_device.parents:
                if not isinstance(parent, storage.devices.MDRaidArrayDevice):
                    return False
            return True

        def translate_real_root(root_device, crypted):
            if crypted and is_parent_a_md_device(root_device):
                return "/dev/mapper/root"
            if crypted and is_parent_a_simple_device(root_device):
                return "/dev/mapper/root"
            if isinstance(root_device, storage.devices.MDRaidArrayDevice):
                return root_device.path
            return root_device.fstabSpec

        crypt_root = None
        if root_crypted:
            log.info("Root crypted? %s, %s, crypto_dev: %s" % (root_crypted,
                root_device.path, crypto_dev.path))

            # NOTE: cannot use crypto_dev.fstabSpec because
            # genkernel doesn't support UUID= on crypto
            translated_real_root = translate_real_root(root_device, True)
            root_crypted = (os.path.basename(translated_real_root), root_device)
            final_cmdline.append("root=%s crypt_root=%s" % (
                translated_real_root, crypto_dev.path,))
            # due to genkernel initramfs stupidity, when crypt_root = crypt_swap
            # do not add crypt_swap.
            if delayed_crypt_swap == crypto_dev.path:
                delayed_crypt_swap = None

        else:
            log.info("Root crypted? Nope!")
            final_cmdline.append("root=%s" % (
                translate_real_root(root_device, False),))

        # always add docrypt, loads kernel mods required by cryptsetup devices
        if "docrypt" not in final_cmdline:
            final_cmdline.append("docrypt")

        if delayed_crypt_swap:
            final_cmdline.append("crypt_swap=%s" % (delayed_crypt_swap,))

        log.info("Generated boot cmdline: %s" % (final_cmdline,))

        return final_cmdline, root_crypted, swap_crypted

    def _setup_grub2(self):

        cmdline_args, root_crypted, swap_crypted = self._get_bootloader_args()

        log.info("_setup_grub2, cmdline_args: %s | "
            "root_crypted: %s | swap_crypted: %s" % (cmdline_args,
            root_crypted, swap_crypted,))

        # "sda" <string>
        grub_target = self.anaconda.bootloader.getDevice()
        try:
            # <storage.device.PartitionDevice>
            boot_device = self.anaconda.storage.mountpoints["/boot"]
        except KeyError:
            boot_device = self.anaconda.storage.mountpoints["/"]

        cmdline_str = ' '.join(cmdline_args)

        # if root_device or swap encrypted, replace splash=silent
        if root_crypted or swap_crypted:
            cmdline_str = cmdline_str.replace('splash=silent', 'splash=verbose')

        log.info("_setup_grub2, grub_target: %s | "
            "boot_device: %s | cmdline_str: %s" % (grub_target,
            boot_device, cmdline_str,))

        self._write_grub2(cmdline_str, grub_target)
        # disable Anaconda bootloader code
        self.anaconda.bootloader.defaultDevice = -1
        return root_crypted or swap_crypted, root_crypted, swap_crypted

    def _write_grub2(self, cmdline, grub_target):

        default_file_noroot = "/etc/default/grub"
        grub_cfg_noroot = "/boot/grub/grub.cfg"

        log.info("%s: %s => %s\n" % ("_write_grub2", "begin", locals()))

        # setup grub variables
        # this file must exist

        # drop vga= from cmdline
        #cmdline = ' '.join([x for x in cmdline.split() if \
        #    not x.startswith("vga=")])

        grub_gentoo_file = self._root + "/etc/default/gentoo-grub"
        grub_gentoo_dir = os.path.dirname(grub_gentoo_file)
        if not os.path.isdir(grub_gentoo_dir):
            os.makedirs(grub_gentoo_dir)
        with open(grub_gentoo_file, "w") as f_w:
            f_w.write("# this file has been added by the Anaconda Installer\n")
            f_w.write("# containing default installer bootloader arguments.\n")
            f_w.write("# DO NOT EDIT NOR REMOVE THIS FILE DIRECTLY !!!\n")
            f_w.write('GRUB_CMDLINE_LINUX="${GRUB_CMDLINE_LINUX} %s"\n' % (
                cmdline,))
            f_w.flush()

        if self.anaconda.bootloader.password and self.anaconda.bootloader.pure:
            # still no proper support, so implement what can be implemented
            # XXX: unencrypted password support
            pass_file = self._root + "/etc/grub.d/00_password"
            f_w = open(pass_file, "w")
            f_w.write("""\
set superuser="root"
password root """+str(self.anaconda.bootloader.pure)+"""
            """)
            f_w.flush()
            f_w.close()

        # remove device.map if found
        dev_map = self._root + "/boot/grub/device.map"
        if os.path.isfile(dev_map):
            os.remove(dev_map)

        # this must be done before, otherwise gfx mode is not enabled
        iutil.execWithRedirect('/sbin/grub2-install',
            ["/dev/" + grub_target, "--recheck", "--force"],
            stdout = PROGRAM_LOG_FILE,
            stderr = PROGRAM_LOG_FILE,
            root = self._root
        )

        iutil.execWithRedirect('/sbin/grub-mkconfig',
            ["--output=%s" % (grub_cfg_noroot,)],
            stdout = PROGRAM_LOG_FILE,
            stderr = PROGRAM_LOG_FILE,
            root = self._root
        )

        log.info("%s: %s => %s\n" % ("_write_grub2", "end", locals()))

    def kernelVersionList(self, rootPath = "/"):
        """
        This won't be used, because our Anaconda codebase is using grub2
        """
        return []

    def doBackendSetup(self, anaconda):

        ossize = self._getLiveSizeMB()
        slash = anaconda.storage.rootDevice
        if slash.size < ossize:
            rc = anaconda.intf.messageWindow(_("Warning"),
                _("The root filesystem you created is "
                  "not large enough for this live "
                  "image (%.2f MB required). But I coult be mistaken.") % ossize,
                type = "custom",
                custom_icon = "error",
                custom_buttons=[_("_Back"),
                                _("_Exit installer")])

    # package/group selection doesn't apply for this backend
    def groupExists(self, group):
        pass

    def selectGroup(self, group, *args):
        pass

    def deselectGroup(self, group, *args):
        pass

    def selectPackage(self, pkg, *args):
        pass

    def deselectPackage(self, pkg, *args):
        pass

    def packageExists(self, pkg):
        return True

    def getDefaultGroups(self, anaconda):
        return []

    def writePackagesKS(self, f, anaconda):
        pass