#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Mitter, micro-blogging client
# Copyright (C) 2007, 2008  the Mitter contributors
#
# 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 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 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/>.

import logging
import cmd
import warnings

import mitterlib.ui.helpers.console_utils as console_utils

from mitterlib.network import NetworksNoNetworkSetupError, NetworksError
from mitterlib.network.networkbase import NetworkError, MessageTooLongWarning

_log = logging.getLogger('ui.cmd')


class Interface(cmd.Cmd):
    """A MH/zork-like interface to Mitter."""

    NAMESPACE = 'zork'

    # -----------------------------------------------------------------------
    # Commands
    # -----------------------------------------------------------------------
    def do_config(self, line=None):
        """Setup the networks."""
        options = self._connection.settings()
        console_utils.authorization(options, self._options)
        return

    def do_fetch(self, line=None):
        """Retrieve the list of latest messages."""
        try:
            data = self._connection.messages()
        except NetworksNoNetworkSetupError:
            # call the config
            self.do_config()
            return
        except NetworkError:
            print 'Network failure. Try again in a few minutes.'
            return

        data.reverse()
        self._messages.extend(data)
        print '%d new messages, %d total messages now' % (len(data),
                len(self._messages))
        self._show_requests()

    def do_display(self, line=None):
        """Display the current message or move the cursor to the
        next/previous."""

        if not line:
            line = ''   # so 'lower()' doesn't fail.

        line = line.lower()
        if line == 'current':
            pass
        elif line == 'next':
            if self._cursor + 1 >= len(self._messages):
                print 'There is no next message.'
                print
                return
            self._cursor += 1
        elif line == 'previous':
            if self._cursor == 0:
                print 'You are in the top of the list.'
                print
                return
            self._cursor -= 1
        else:
            print 'Display WHAT?'
            print '("current", "previous" or "next")'
            return

        print 'Message %d of %d:' % (self._cursor + 1, len(self._messages))
        print

        message = self._messages[self._cursor]
        console_utils.print_messages(message, self._connection)
        return

    def do_list(self, line=None):
        """Print a summary of the messages in the list."""
        for pos in xrange(len(self._messages)):
            if pos == self._cursor:
                indicator = '>'
            else:
                indicator = ' '

            message = self._messages[pos]
            long_line = '%s%s: %s' % (indicator, message.username,
                    message.message)

            if len(long_line) > 75:
                last_space = long_line.rfind(' ', 0, 76)
                long_line = long_line[:last_space] + '...'

            print long_line
        return

    def do_reply(self, line):
        """Make a reply to the current message."""
        message = self._messages[self._cursor]

        if self._update(line, reply_to=message):
            print 'Reply send.'
            self.lastcmd = None

    def do_say(self, line):
        """Update your status."""
        if self._update(line):
            print 'Status updated'
            # clear the message so it's not send if the user press enter
            # twice.
            self.lastcmd = None

    def do_thread(self, line):
        """Display the conversation thread with the message pointed by the
        cursor."""
        message = self._messages[self._cursor]
        thread = console_utils.fetch_thread(message, self._connection)
        console_utils.print_thread(thread, self._connection)
        self._show_requests()

    def do_retweet(self, line):
        """Resends the original message to your followers."""
        original_message = self._messages[self._cursor]
        new_message = console_utils.make_retweet(original_message)
        return self.do_say(new_message)

    def do_exit(self, line):
        """Quit the application."""
        _log.debug('Exiting application')
        return True

    # -----------------------------------------------------------------------
    # Helper functions
    # -----------------------------------------------------------------------
    def _update(self, status, reply_to=None):
        """Send the update to the server."""
        try:
            self._connection.update(status, reply_to=reply_to)
        except (NetworksError, NetworkError):
            # TODO: capture the proper exception.
            # TODO: Also, NetworkError's should never get here. Networks
            #       should catch that (leaving the status kinda messed.)
            print 'Network error. Try again in a few minutes.'
            return False
        except MessageTooLongWarning:
            print 'Your message is too long. Update NOT send.'
            return False
        return True

    def _show_requests(self):
        requests = self._connection.available_requests()
        available = []
        for network in requests:
            if requests[network] >= 0:
                # just show information for networks that count that
                available.append('%d requests in %s' % (
                    requests[network],
                    self._connection.name(network)))

        print 'You have %s' % (', '. join(available))
        print

    # -----------------------------------------------------------------------
    # Methods required by the main Mitter code
    # -----------------------------------------------------------------------
    def __init__(self, connection, options):
        """Class initialization."""

        cmd.Cmd.__init__(self)
        self._options = options
        self._last_update = None
        self._connection = connection
        self._messages = []
        self._cursor = 0

        self.prompt = '> '
        return

    def __call__(self):
        """Start the interface."""
        warnings.simplefilter('error')  # Warnings are exceptions
        self.cmdloop()
        return

    @classmethod
    def options(self, options):
        # no options for this interface
        return