# Copyright 2014 OpenStack Foundation
#
# 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 argparse
import logging
import os
import sys
import threading

import urwid

import db
import config
import gitrepo
import mywid
import sync
import view.project_list

palette=[('reversed', 'default,standout', ''),
         ('header', 'white,bold', 'dark blue'),
         ('error', 'light red', 'dark blue'),
         ('table-header', 'white,bold', ''),
         # Diff
         ('removed-line', 'dark red', ''),
         ('removed-word', 'light red', ''),
         ('added-line', 'dark green', ''),
         ('added-word', 'light green', ''),
         ('nonexistent', 'default', ''),
         ('reversed-removed-line', 'dark red,standout', ''),
         ('reversed-removed-word', 'light red,standout', ''),
         ('reversed-added-line', 'dark green,standout', ''),
         ('reversed-added-word', 'light green,standout', ''),
         ('reversed-nonexistent', 'default,standout', ''),
         ('draft-comment', 'default', 'dark gray'),
         ('comment', 'light gray', 'dark gray'),
         ('comment-name', 'white', 'dark gray'),
         # Change view
         ('change-data', 'light cyan', ''),
         ('change-header', 'light blue', ''),
         ('revision-name', 'light blue', ''),
         ('revision-commit', 'dark blue', ''),
         ('revision-comments', 'default', ''),
         ('revision-drafts', 'dark red', ''),
         ('reversed-revision-name', 'light blue,standout', ''),
         ('reversed-revision-commit', 'dark blue,standout', ''),
         ('reversed-revision-comments', 'default,standout', ''),
         ('reversed-revision-drafts', 'dark red,standout', ''),
         ('change-message-name', 'light blue', ''),
         ('change-message-header', 'dark blue', ''),
         # project list
         ('unreviewed-project', 'white', ''),
         ('subscribed-project', 'default', ''),
         ('unsubscribed-project', 'dark gray', ''),
         ('reversed-unreviewed-project', 'white,standout', ''),
         ('reversed-subscribed-project', 'default,standout', ''),
         ('reversed-unsubscribed-project', 'dark gray,standout', ''),
         # change list
         ('unreviewed-change', 'default', ''),
         ('reviewed-change', 'dark gray', ''),
         ('reversed-unreviewed-change', 'default,standout', ''),
         ('reversed-reviewed-change', 'dark gray,standout', ''),
         ]

WELCOME_TEXT = """\
Welcome to Gertty!

To get started, you should subscribe to some projects.  Press the "l"
key to list all the projects, navigate to the ones you are interested
in, and then press "s" to subscribe to them.  Gertty will
automatically sync changes in your subscribed projects.

Press the F1 key anywhere to get help.  Your terminal emulator may
require you to press function-F1 or alt-F1 instead.

"""

class StatusHeader(urwid.WidgetWrap):
    def __init__(self, app):
        super(StatusHeader, self).__init__(urwid.Columns([]))
        self.app = app
        self.title = urwid.Text(u'Start')
        self.error = urwid.Text('')
        self.offline = urwid.Text('')
        self.sync = urwid.Text(u'Sync: 0')
        self._w.contents.append((self.title, ('pack', None, False)))
        self._w.contents.append((urwid.Text(u''), ('weight', 1, False)))
        self._w.contents.append((self.error, ('pack', None, False)))
        self._w.contents.append((self.offline, ('pack', None, False)))
        self._w.contents.append((self.sync, ('pack', None, False)))

    def update(self, title=None, error=False, offline=None):
        if title:
            self.title.set_text(title)
        if error:
            self.error.set_text(('error', u'Error'))
        if offline is not None:
            if offline:
                self.error.set_text(u'Offline')
            else:
                self.error.set_text(u'')
        self.sync.set_text(u' Sync: %i' % self.app.sync.queue.qsize())

class App(object):
    def __init__(self, server=None, debug=False, disable_sync=False):
        self.server = server
        self.config = config.Config(server)
        if debug:
            level = logging.DEBUG
        else:
            level = logging.WARNING
        logging.basicConfig(filename=self.config.log_file, filemode='w',
                            format='%(asctime)s %(message)s',
                            level=level)
        self.log = logging.getLogger('gertty.App')
        self.log.debug("Starting")
        self.db = db.Database(self)
        self.sync = sync.Sync(self)

        self.screens = []
        self.status = StatusHeader(self)
        self.header = urwid.AttrMap(self.status, 'header')
        screen = view.project_list.ProjectListView(self)
        self.status.update(title=screen.title)
        self.loop = urwid.MainLoop(screen, palette=palette,
                                   unhandled_input=self.unhandledInput)
        if screen.isEmpty():
            self.welcome()
        self.sync_pipe = self.loop.watch_pipe(self.refresh)
        self.loop.screen.tty_signal_keys(start='undefined', stop='undefined')
        #self.loop.screen.set_terminal_properties(colors=88)
        if not disable_sync:
            self.sync_thread = threading.Thread(target=self.sync.run, args=(self.sync_pipe,))
            self.sync_thread.daemon = True
            self.sync_thread.start()
        else:
            self.sync_thread = None

    def run(self):
        self.loop.run()

    def _quit(self, widget=None):
        raise urwid.ExitMainLoop()

    def quit(self):
        dialog = mywid.YesNoDialog(u'Quit',
                                   u'Are you sure you want to quit?')
        urwid.connect_signal(dialog, 'no', self.backScreen)
        urwid.connect_signal(dialog, 'yes', self._quit)

        self.popup(dialog)

    def changeScreen(self, widget):
        self.status.update(title=widget.title)
        self.screens.append(self.loop.widget)
        self.loop.widget = widget

    def backScreen(self, widget=None):
        if not self.screens:
            return
        widget = self.screens.pop()
        self.status.update(title=widget.title)
        self.loop.widget = widget
        self.refresh()

    def refresh(self, data=None):
        widget = self.loop.widget
        while isinstance(widget, urwid.Overlay):
            widget = widget.contents[0][0]
        widget.refresh()

    def popup(self, widget,
              relative_width=50, relative_height=25,
              min_width=20, min_height=8):
        overlay = urwid.Overlay(widget, self.loop.widget,
                                'center', ('relative', relative_width),
                                'middle', ('relative', relative_height),
                                min_width=min_width, min_height=min_height)
        self.screens.append(self.loop.widget)
        self.loop.widget = overlay

    def help(self):
        if not hasattr(self.loop.widget, 'help'):
            return
        dialog = mywid.MessageDialog('Help', self.loop.widget.help)
        lines = self.loop.widget.help.split('\n')
        urwid.connect_signal(dialog, 'close',
            lambda button: self.backScreen())
        self.popup(dialog, min_width=76, min_height=len(lines)+4)

    def welcome(self):
        text = WELCOME_TEXT + self.loop.widget.help
        dialog = mywid.MessageDialog('Welcome', text)
        lines = text.split('\n')
        urwid.connect_signal(dialog, 'close',
            lambda button: self.backScreen())
        self.popup(dialog, min_width=76, min_height=len(lines)+4)

    def unhandledInput(self, key):
        if key == 'esc':
            self.backScreen()
        elif key == 'f1':
            self.help()
        elif key == 'ctrl q':
            self.quit()

    def getRepo(self, project_name):
        local_path = os.path.join(self.config.git_root, project_name)
        local_root = os.path.abspath(self.config.git_root)
        assert os.path.commonprefix((local_root, local_path)) == local_root
        return gitrepo.Repo(self.config.url+'p/'+project_name,
                            local_path)

if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description='Console client for Gerrit Code Review.')
    parser.add_argument('-d', dest='debug', action='store_true',
                        help='enable debug logging')
    parser.add_argument('--no-sync', dest='no_sync', action='store_true',
                        help='disable remote syncing')
    parser.add_argument('server', nargs='?',
                        help='the server to use (as specified in config file)')
    args = parser.parse_args()
    g = App(args.server, args.debug, args.no_sync)
    g.run()