# Copyright 2015 Canonical, Ltd.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

""" Chooser

Chooser provides a view with recovery chooser actions.

"""
import logging

from urwid import Text, connect_signal

from subiquitycore.ui.actionmenu import Action, ActionMenu
from subiquitycore.ui.buttons import back_btn, danger_btn, forward_btn
from subiquitycore.ui.container import ListBox, Pile
from subiquitycore.ui.table import TablePile, TableRow
from subiquitycore.ui.utils import Color, button_pile, make_action_menu_row, screen
from subiquitycore.view import BaseView

log = logging.getLogger("console_conf.ui.views.chooser")


class ChooserBaseView(BaseView):
    title = "Ubuntu Core"

    def __init__(self, current, scr):
        super().__init__(scr)

        if current is not None:
            self.title = current.model.display_name


def by_preferred_action_type(action):
    """Order action entries by having the 'run' mode first, then 'recover',
    then 'install', the rest is ordered alphabetically."""
    priority = {"run": 0, "recover": 1, "install": 2}
    return (priority.get(action.mode, 100), action.title.lower())


class ChooserCurrentSystemView(ChooserBaseView):
    excerpt = "Select action:"

    def __init__(self, controller, current, has_more=False):
        self.controller = controller
        log.debug("more systems available: %s", has_more)
        log.debug("current system: %s", current)

        actions = []
        for action in sorted(current.actions, key=by_preferred_action_type):
            actions.append(
                forward_btn(
                    label=action.title.capitalize(),
                    on_press=self._current_system_action,
                    user_arg=(current, action),
                )
            )

        if has_more:
            # add a button to show the other systems
            actions.append(Text(""))
            actions.append(
                forward_btn(
                    label="Show all available systems", on_press=self._more_options
                )
            )

        lb = ListBox(actions)

        super().__init__(current, screen(lb, narrow_rows=True, excerpt=self.excerpt))

    def _current_system_action(self, sender, arg):
        current, action = arg
        self.controller.select(current, action)

    def _more_options(self, sender):
        self.controller.more_options()

    def back(self, result):
        self.controller.back()


class ChooserView(ChooserBaseView):
    excerpt = (
        "Select one of available recovery systems and a desired action to execute."
    )

    def __init__(self, controller, systems):
        self.controller = controller

        heading_table = TablePile(
            [
                TableRow(
                    [
                        Color.info_minor(Text(header))
                        for header in ["LABEL", "MODEL", "PUBLISHER", ""]
                    ]
                )
            ],
            spacing=2,
        )

        trows = []
        systems = sorted(
            systems,
            key=lambda s: (
                s.brand.display_name,
                s.model.display_name,
                s.current,
                s.label,
            ),
        )
        for s in systems:
            actions = []
            log.debug("actions: %s", s.actions)
            for act in sorted(s.actions, key=by_preferred_action_type):
                actions.append(
                    Action(label=act.title.capitalize(), value=act, enabled=True)
                )
            menu = ActionMenu(actions)
            connect_signal(menu, "action", self._system_action, s)
            srow = make_action_menu_row(
                [
                    Text(s.label),
                    Text(s.model.display_name),
                    Text(s.brand.display_name),
                    Text("(installed)" if s.current else ""),
                    menu,
                ],
                menu,
            )
            trows.append(srow)

        systems_table = TablePile(trows, spacing=2)
        systems_table.bind(heading_table)
        rows = [
            Pile([heading_table, systems_table]),
        ]

        buttons = []
        if controller.model.current is not None:
            # back to options of current system
            buttons.append(back_btn("BACK", on_press=self.back))

        super().__init__(
            controller.model.current,
            screen(
                rows=rows,
                buttons=button_pile(buttons),
                focus_buttons=False,
                excerpt=self.excerpt,
            ),
        )

    def _system_action(self, sender, action, system):
        self.controller.select(system, action)

    def back(self, result):
        self.controller.back()


class ChooserConfirmView(ChooserBaseView):
    canned_summary = {
        "run": "Continue running the system without any changes.",
        "recover": "You have requested to reboot the system into recovery mode.",
        "install": (
            "You are about to {action_lower} the system version "
            "{version} for {model} from {publisher}.\n\n"
            "This will remove all existing user data on the "
            "device.\n\n"
            "The system will reboot in the process."
        ),
    }
    default_summary = (
        'You are about to execute action "{action}" using '
        "system version {version} for device {model} from "
        "{publisher}.\n\n"
        "Make sure you understand the consequences of "
        "performing this action."
    )

    def __init__(self, controller, selection):
        self.controller = controller

        buttons = [
            danger_btn("CONFIRM", on_press=self.confirm),
            back_btn("BACK", on_press=self.back),
        ]
        fmt = self.canned_summary.get(selection.action.mode, self.default_summary)
        summary = fmt.format(
            action=selection.action.title,
            action_lower=selection.action.title.lower(),
            model=selection.system.model.display_name,
            publisher=selection.system.brand.display_name,
            version=selection.system.label,
        )
        rows = [
            Text(summary),
        ]
        super().__init__(
            controller.model.current,
            screen(rows=rows, buttons=button_pile(buttons), focus_buttons=False),
        )

    def confirm(self, result):
        self.controller.confirm()

    def back(self, result):
        self.controller.back()