#
# Copyright (C) 2008, 2013, 2014 Red Hat, Inc.
# Copyright (C) 2008 Cole Robinson <crobinso@redhat.com>
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA.
#

import logging

from gi.repository import Gdk
from gi.repository import GObject
from gi.repository import Gtk

from .baseclass import vmmGObjectUI
from .asyncjob import vmmAsyncJob
from . import uiutil

from virtinst import StoragePool

PAGE_NAME   = 0
PAGE_FORMAT = 1


class vmmCreatePool(vmmGObjectUI):
    __gsignals__ = {
        "pool-created": (GObject.SignalFlags.RUN_FIRST, None, [str]),
    }

    def __init__(self, conn):
        vmmGObjectUI.__init__(self, "createpool.ui", "vmm-create-pool")
        self.conn = conn

        self._pool = None

        self.builder.connect_signals({
            "on_pool_forward_clicked" : self.forward,
            "on_pool_back_clicked"    : self.back,
            "on_pool_cancel_clicked"  : self.close,
            "on_vmm_create_pool_delete_event" : self.close,
            "on_pool_finish_clicked"  : self.forward,
            "on_pool_pages_change_page" : self.page_changed,

            "on_pool_source_button_clicked" : self.browse_source_path,
            "on_pool_target_button_clicked" : self.browse_target_path,

            "on_pool_name_activate": self.forward,
            "on_pool_hostname_activate" : self.hostname_changed,
            "on_pool_iqn_chk_toggled": self.iqn_toggled,
        })
        self.bind_escape_key_close()

        self.set_initial_state()
        self.set_page(PAGE_NAME)

    def show(self, parent):
        logging.debug("Showing new pool wizard")
        self.reset_state()
        self.topwin.set_transient_for(parent)
        self.topwin.present()

    def close(self, ignore1=None, ignore2=None):
        logging.debug("Closing new pool wizard")
        self.topwin.hide()
        return 1

    def _cleanup(self):
        self.conn = None
        self._pool = None

    def set_initial_state(self):
        self.widget("pool-pages").set_show_tabs(False)

        blue = Gdk.Color.parse("#0072A8")[1]
        self.widget("header").modify_bg(Gtk.StateType.NORMAL, blue)

        type_list = self.widget("pool-type")
        type_model = Gtk.ListStore(str, str)
        type_list.set_model(type_model)
        uiutil.init_combo_text_column(type_list, 1)

        format_list = self.widget("pool-format")
        format_model = Gtk.ListStore(str, str)
        format_list.set_model(format_model)
        uiutil.init_combo_text_column(format_list, 1)

        # Target path combo box entry
        target_list = self.widget("pool-target-path")
        # target_path, Label, pool class instance
        target_model = Gtk.ListStore(str, str, object)
        target_model.set_sort_column_id(0, Gtk.SortType.ASCENDING)
        target_list.set_model(target_model)
        target_list.set_entry_text_column(0)

        # Source path combo box entry
        source_list = self.widget("pool-source-path")
        # source_path, Label, pool class instance
        source_model = Gtk.ListStore(str, str, object)
        source_model.set_sort_column_id(0, Gtk.SortType.ASCENDING)
        source_list.set_model(source_model)
        source_list.set_entry_text_column(0)

        self.populate_pool_type()

    def reset_state(self):
        self.widget("pool-pages").set_current_page(0)
        self.widget("pool-forward").show()
        self.widget("pool-finish").hide()
        self.widget("pool-back").set_sensitive(False)

        self.widget("pool-name").set_text("")
        self.widget("pool-name").grab_focus()
        self.widget("pool-type").set_active(0)
        self.widget("pool-target-path").get_child().set_text("")
        self.widget("pool-source-path").get_child().set_text("")
        self.widget("pool-hostname").set_text("")
        self.widget("pool-iqn-chk").set_active(False)
        self.widget("pool-iqn-chk").toggled()
        self.widget("pool-iqn").set_text("")
        self.widget("pool-format").set_active(-1)
        self.widget("pool-build").set_sensitive(True)
        self.widget("pool-build").set_active(False)
        self.widget("pool-details-grid").set_visible(False)


    def hostname_changed(self, ignore):
        # If a hostname was entered, try to lookup valid pool sources.
        self.populate_pool_sources()

    def iqn_toggled(self, src):
        self.widget("pool-iqn").set_sensitive(src.get_active())

    def populate_pool_type(self):
        model = self.widget("pool-type").get_model()
        model.clear()
        types = StoragePool.get_pool_types()
        types.sort()
        for typ in types:
            model.append([typ, "%s: %s" %
                         (typ, StoragePool.get_pool_type_desc(typ))])

    def populate_pool_format(self, formats):
        model = self.widget("pool-format").get_model()
        model.clear()
        for f in formats:
            model.append([f, f])

    def populate_pool_sources(self):
        source_list = self.widget("pool-source-path")
        source_model = source_list.get_model()
        source_model.clear()

        target_list = self.widget("pool-target-path")
        target_model = target_list.get_model()
        target_model.clear()

        use_list = source_list
        use_model = source_model
        entry_list = []
        if self._pool.type == StoragePool.TYPE_SCSI:
            entry_list = self.list_scsi_adapters()
            use_list = source_list
            use_model = source_model

        elif self._pool.type == StoragePool.TYPE_LOGICAL:
            pool_list = self.list_pool_sources()
            entry_list = [[p.target_path, p.target_path, p]
                          for p in pool_list]
            use_list = target_list
            use_model = target_model

        elif self._pool.type == StoragePool.TYPE_DISK:
            entry_list = self.list_disk_devs()
            use_list = source_list
            use_model = source_model

        elif self._pool.type == StoragePool.TYPE_NETFS:
            host = self.get_config_host()
            if host:
                pool_list = self.list_pool_sources(host=host)
                entry_list = [[p.source_path, p.source_path, p]
                              for p in pool_list]
                use_list = source_list
                use_model = source_model

        for e in entry_list:
            use_model.append(e)

        if entry_list:
            use_list.set_active(0)

    def list_scsi_adapters(self):
        scsi_hosts = self.conn.filter_nodedevs("scsi_host")
        host_list = [dev.xmlobj.host for dev in scsi_hosts]

        clean_list = []
        for h in host_list:
            name = "host%s" % h
            tmppool = self._make_stub_pool()
            tmppool.source_path = name

            entry = [name, name, tmppool]
            if name not in [l[0] for l in clean_list]:
                clean_list.append(entry)

        return clean_list

    def list_disk_devs(self):
        devs = self.conn.filter_nodedevs("storage")
        devlist = []
        for dev in devs:
            if dev.xmlobj.drive_type != "disk" or not dev.xmlobj.block:
                continue
            devlist.append(dev.xmlobj.block)

        devlist.sort()
        clean_list = []
        for dev in devlist:
            tmppool = self._make_stub_pool()
            tmppool.source_path = dev

            entry = [dev, dev, tmppool]
            if dev not in [l[0] for l in clean_list]:
                clean_list.append(entry)

        return clean_list

    def list_pool_sources(self, host=None):
        pool_type = self._pool.type

        plist = []
        try:
            plist = StoragePool.pool_list_from_sources(
                                                self.conn.get_backend(),
                                                pool_type,
                                                host=host)
        except Exception:
            logging.exception("Pool enumeration failed")

        return plist

    def show_options_by_pool(self):
        def show_row(base, do_show):
            widget = self.widget(base + "-label")
            uiutil.set_grid_row_visible(widget, do_show)

        src = self._pool.supports_property("source_path")
        src_b = src and not self.conn.is_remote()
        tgt = self._pool.supports_property("target_path")
        tgt_b = tgt and not self.conn.is_remote()
        host = self._pool.supports_property("hosts")
        fmt = self._pool.supports_property("formats")
        iqn = self._pool.supports_property("iqn")
        builddef, buildsens = self.get_build_default()

        # We don't show source_name for logical pools, since we use
        # pool-sources to avoid the need for it
        src_name = (self._pool.supports_property("source_name") and
                    self._pool.type != self._pool.TYPE_LOGICAL)

        # Source path browsing is meaningless for net pools
        if self._pool.type in [StoragePool.TYPE_NETFS,
                               StoragePool.TYPE_ISCSI,
                               StoragePool.TYPE_SCSI,
                               StoragePool.TYPE_GLUSTER]:
            src_b = False

        show_row("pool-target", tgt)
        show_row("pool-source", src)
        show_row("pool-hostname", host)
        show_row("pool-format", fmt)
        show_row("pool-build", buildsens)
        show_row("pool-iqn", iqn)
        show_row("pool-source-name", src_name)

        if iqn:
            self.widget("pool-source-label").set_label(_("_Source IQN:"))
        else:
            self.widget("pool-source-label").set_label(_("_Source Path:"))

        if tgt:
            self.widget("pool-target-path").get_child().set_text(
                self._pool.target_path)

        self.widget("pool-target-button").set_sensitive(tgt_b)
        self.widget("pool-source-button").set_sensitive(src_b)
        self.widget("pool-build").set_active(builddef)

        if src_name:
            self.widget("pool-source-name").set_text(self._pool.source_name)

        self.widget("pool-format").set_active(-1)
        if fmt:
            self.populate_pool_format(self._pool.list_formats("formats"))
            self.widget("pool-format").set_active(0)

        self.populate_pool_sources()


    def get_config_type(self):
        return uiutil.get_list_selection(self.widget("pool-type"))

    def get_config_name(self):
        return self.widget("pool-name").get_text()

    def get_config_target_path(self):
        src = self.widget("pool-target-path")
        if not src.get_sensitive():
            return None

        ret = uiutil.get_list_selection(src, column=1)
        if ret is not None:
            return ret
        return src.get_child().get_text()

    def get_config_source_path(self):
        src = self.widget("pool-source-path")
        if not src.get_sensitive():
            return None

        ret = uiutil.get_list_selection(src, column=1)
        if ret is not None:
            return ret
        return src.get_child().get_text().strip()

    def get_config_host(self):
        host = self.widget("pool-hostname")
        if host.get_sensitive():
            return host.get_text().strip()
        return None

    def get_config_source_name(self):
        name = self.widget("pool-source-name")
        if name.get_sensitive():
            return name.get_text().strip()
        return None

    def get_config_format(self):
        return uiutil.get_list_selection(self.widget("pool-format"))

    def get_config_iqn(self):
        iqn = self.widget("pool-iqn")
        if iqn.get_sensitive() and iqn.get_visible():
            return iqn.get_text().strip()
        return None

    def get_build_default(self):
        """ Return (default value, whether build option can be changed)"""
        if not self._pool:
            return (False, False)
        if self._pool.type in [StoragePool.TYPE_DIR,
                               StoragePool.TYPE_FS,
                               StoragePool.TYPE_NETFS]:
            # Building for these simply entails creating a directory
            return (True, False)
        elif self._pool.type in [StoragePool.TYPE_LOGICAL,
                                 StoragePool.TYPE_DISK]:
            # This is a dangerous operation, anything (False, True)
            # should be assumed to be one.
            return (False, True)
        else:
            return (False, False)


    def browse_source_path(self, ignore1=None):
        source = self._browse_file(_("Choose source path"),
                                   startfolder="/dev", foldermode=False)
        if source:
            self.widget("pool-source-path").get_child().set_text(source)

    def browse_target_path(self, ignore1=None):
        startfolder = StoragePool.get_default_dir(self.conn.get_backend())
        target = self._browse_file(_("Choose target directory"),
                                   startfolder=startfolder,
                                   foldermode=True)
        if target:
            self.widget("pool-target-path").get_child().set_text(target)


    def forward(self, ignore=None):
        notebook = self.widget("pool-pages")
        try:
            if self.validate(notebook.get_current_page()) is not True:
                return
            if notebook.get_current_page() == PAGE_FORMAT:
                self.finish()
            else:
                notebook.next_page()
        except Exception, e:
            self.err.show_err(_("Uncaught error validating input: %s") % str(e))
            return

    def back(self, ignore=None):
        self.widget("pool-pages").prev_page()

    def _signal_pool_added(self, src, connkey, created_name):
        ignore = src
        if connkey == created_name:
            self.emit("pool-created", connkey)

    def _finish_cb(self, error, details):
        self.topwin.set_sensitive(True)
        self.topwin.get_window().set_cursor(
            Gdk.Cursor.new(Gdk.CursorType.TOP_LEFT_ARROW))

        if error:
            error = _("Error creating pool: %s") % error
            self.err.show_err(error,
                              details=details)
        else:
            self.conn.connect_once("pool-added", self._signal_pool_added,
                self._pool.name)
            self.conn.schedule_priority_tick(pollpool=True)
            self.close()

    def finish(self):
        self.topwin.set_sensitive(False)
        self.topwin.get_window().set_cursor(
            Gdk.Cursor.new(Gdk.CursorType.WATCH))
        build = self.widget("pool-build").get_active()

        progWin = vmmAsyncJob(self._async_pool_create, [build],
                              self._finish_cb, [],
                              _("Creating storage pool..."),
                              _("Creating the storage pool may take a "
                                "while..."),
                              self.topwin)
        progWin.run()

    def _async_pool_create(self, asyncjob, build):
        meter = asyncjob.get_meter()

        logging.debug("Starting backround pool creation.")
        poolobj = self._pool.install(create=True, meter=meter, build=build)
        poolobj.setAutostart(True)
        logging.debug("Pool creation succeeded")

    def set_page(self, page_number):
        # Update page number
        page_lbl = ("<span color='#59B0E2'>%s</span>" %
                    _("Step %(current_page)d of %(max_page)d") %
                    {'current_page': page_number + 1,
                     'max_page': PAGE_FORMAT + 1})
        self.widget("header-pagenum").set_markup(page_lbl)

        isfirst = (page_number == PAGE_NAME)
        islast = (page_number == PAGE_FORMAT)

        self.widget("pool-back").set_sensitive(not isfirst)
        self.widget("pool-finish").set_visible(islast)
        self.widget("pool-forward").set_visible(not islast)
        self.widget(islast and "pool-finish" or "pool-forward").grab_focus()

        self.widget("pool-details-grid").set_visible(islast)
        if islast:
            self.show_options_by_pool()

    def page_changed(self, notebook_ignore, page_ignore, page_number):
        self.set_page(page_number)

    def get_pool_to_validate(self):
        """
        Return a pool instance to use for parameter assignment validation.
        For most pools this will be the one we built after step 1, but for
        pools we find via FindPoolSources, this will be different
        """
        source_list = self.widget("pool-source-path")
        target_list = self.widget("pool-target-path")

        pool = uiutil.get_list_selection(source_list, column=2,
                                         check_entry=False)
        if pool is None:
            pool = uiutil.get_list_selection(target_list, column=2,
                                             check_entry=False)

        return pool

    def _make_stub_pool(self):
        pool = StoragePool(self.conn.get_backend())
        pool.type = self.get_config_type()
        return pool

    def _validate_page_name(self, usepool=None):
        try:
            if usepool:
                self._pool = usepool
            else:
                self._pool = self._make_stub_pool()
            self._pool.name = self.get_config_name()
        except ValueError, e:
            return self.err.val_err(_("Pool Parameter Error"), e)

        return True

    def _validate_page_format(self):
        target = self.get_config_target_path()
        host = self.get_config_host()
        source = self.get_config_source_path()
        fmt = self.get_config_format()
        iqn = self.get_config_iqn()
        source_name = self.get_config_source_name()

        if not self._validate_page_name(self.get_pool_to_validate()):
            return

        try:
            self._pool.target_path = target
            if host:
                self._pool.add_host(host)
            if source:
                self._pool.source_path = source
            if fmt:
                self._pool.format = fmt
            if iqn:
                self._pool.iqn = iqn
            if source_name:
                self._pool.source_name = source_name

            self._pool.validate()
        except ValueError, e:
            return self.err.val_err(_("Pool Parameter Error"), e)

        buildval = self.widget("pool-build").get_active()
        buildsen = (self.widget("pool-build").get_sensitive() and
                    self.widget("pool-build").get_visible())
        if buildsen and buildval:
            ret = self.err.yes_no(_("Building a pool of this type will "
                                    "format the source device. Are you "
                                    "sure you want to 'build' this pool?"))
            if not ret:
                return ret

        return True

    def validate(self, page):
        if page == PAGE_NAME:
            return self._validate_page_name()
        elif page == PAGE_FORMAT:
            return self._validate_page_format()

    def _browse_file(self, dialog_name, startfolder=None, foldermode=False):
        mode = Gtk.FileChooserAction.OPEN
        if foldermode:
            mode = Gtk.FileChooserAction.SELECT_FOLDER

        return self.err.browse_local(self.conn, dialog_name,
            dialog_type=mode, start_folder=startfolder)
