#!/usr/bin/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 datetime
import warnings

import mitterlib.ui.helpers.console_utils as console_utils
import mitterlib.constants

from mitterlib.network import NetworksNoNetworkSetupError, NetworksError
from mitterlib.network.networkbase import NetworkError, \
    NetworkPermissionDeniedError

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


class Interface(cmd.Cmd):
    """The command line interface for Mitter."""

    NAMESPACE = 'cmd'

    # -----------------------------------------------------------------------
    # Methods required by cmd.Cmd (our commands)
    # -----------------------------------------------------------------------

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

    def do_timeline(self, line):
        """Return a list of new messages in your friends timeline."""
        try:
            self._show_messages(self._connection.messages())
        except NetworksNoNetworkSetupError:
            # call the config
            self.do_config()
        except NetworkError:
            print 'Network failure. Try again in a few minutes.'
        return

    def do_replies(self, line):
        """Get a list of replies to you."""
        try:
            self._show_messages(self._connection.replies(), is_timeline=False)
        except NetworksNoNetworkSetupError:
            self.do_config()
        except NetworkError:
            print 'Network failure. Try again in a few minutes.'
        return

    def do_update(self, line):
        """Update your status."""
        if self._update(line):
            print 'Status updated'
        else:
            print 'Failed to update your status. Try again in a few minutes.'

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

    def do_EOF(self, line):
        """Quit the application (it's the same as "exit"). You can also use
        Ctrl+D."""
        print       # Cmd doesn't add an empty line after the ^D
        return self.do_exit(None)

    def do_rt(self, line):
        """"Retweet" a message in your list."""
        pos = int(line)
        if not self._check_message(pos):
            return

        original_message = self._messages[pos-1]
        if not original_message.message.lower().startswith('rt @'):
            new_message = 'RT @%s: %s' % (original_message.username,
                    original_message.message)
        else:
            # if it is a retweet already, keep the original information
            new_message = original_message.message
        return self.do_update(new_message)

    def do_r(self, line):
        """Same as "reply"."""
        return self.do_reply(line)

    def do_reply(self, line):
        """Reply to a message. Use "reply"/"r" <id> <message>."""
        line_split = line.split()
        pos = int(line_split[0])    # <number> message (cmd strips the
                                    #  command already)
        if not self._check_message(pos):
            return

        message = self._messages[pos - 1]
        if self._update(' '.join(line_split[1:]), reply_to=message):
            print 'Reply sent.'
        else:
            print "Couldn't send your reply. Try again in a few minutes."

        return

    def do_delete(self, line):
        """Delete a message. You must provide the number of the displayed\
        message."""
        message_id = int(line)
        real_message_id = self._messages[message_id - 1]
        try:
            self._connection.delete_message(real_message_id)
        except NetworkPermissionDeniedError:
            print 'Permission denied.'
            return

        print 'Message deleted.'
        return

    def do_thread(self, line):
        """Retrieves the thread about a single message (like a reply.) Be
        aware that this may consume a lot of your hourly requests if the
        thread is too long."""
        message_id = int(line)
        _log.debug('Message in pos %d', message_id)
        if not self._check_message(message_id):
            return

        message = self._messages[message_id - 1]
        thread = [message]
        self._thread(thread, message.parent, message.network)
        return

    def emptyline(self):
        """Called when the user doesn't call any command. Default is to repeat
        the last command; we are going to call timeline() again."""
        return self.do_timeline(None)

    def default(self, line):
        """Called when we receive an unknown command; default is error
        message, we are going to call update() instead."""
        return self.do_update(line)

    # -----------------------------------------------------------------------
    # Helper functions
    # -----------------------------------------------------------------------

    def _check_message(self, message_id):
        """Check if a message is valid in the current list."""
        if message_id < 1 or message_id > len(self._messages):
            print
            print 'No such message.'
            print
            return False
        return True

    def _show_messages(self, data, is_timeline=True):
        """Function called after we receive the list of messages."""

        if is_timeline:
            self._last_update = datetime.datetime.now()

        self._messages = data
        console_utils.print_messages(data, self._connection,
                show_numbers=True)
        self._update_prompt()
        return

    def _post_delete(self, data, error):
        """Function called after we delete a message."""
        if error:
            if error == 403:
                # Ok, we are *assuming* that, if you get a Forbidden
                # error, it means it's not your message.
                print "You can't delete this message."
                # TODO: we are using Logging.Error in the Twitter
                # object when we get this error. So the user will
                # see connection errors instead of this simple
                # message.
            else:
                print 'Error deleting message.'
        else:
            print 'Message deleted.'
        self._update_prompt()
        return

    def _thread(self, thread_list, message_id, network):
        """Build a conversation thread."""
        _log.debug('Requesting message %s.%s' % (message_id, network))
        try:
            message = self._connection.message(message_id, network)
        except NetworkError, exc:
            _log.debug('Network error:')
            _log.debug(exc)
            thread_list.insert(0, 'Network error')
            self._print_thread(thread_list)
            return
        # TODO: Catch a permission denied exception and add a proper message
        #       for it.

        thread_list.insert(0, message)
        if message.parent:
            self._thread(thread_list, message.parent, network)
        else:
            self._print_thread(thread_list)
        return

    def _print_thread(self, thread_list):
        """Print the conversation thread."""
        pos = 0
        _log.debug('%d messages in thread', len(thread_list))
        for message in thread_list:
            console_utils.print_messages(message, self._connection,
                    show_numbers=False, indent=pos)
            pos += 1
        return

    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.)
            return False
        except MessageTooLongWarning:
            print 'Your message is too long. Update NOT send.'
            return False

        self._update_prompt()
        return True

    def _update_prompt(self):
        """Update the command line prompt."""
        # check the requests limits for every network
        requests = self._connection.available_requests()
        available = []
        for network in requests:
            if requests[network] >= 0:
                # just show information for networks that count that
                available.append('%s (%s): %d' % (
                    self._connection.name(network),
                    network,
                    requests[network]))

        if self._last_update:
            update_text = self._last_update.strftime('%H:%M')
        else:
            update_text = 'Never'
        self.prompt = ('Last update: %s [%s]\nMitter> ' %
            (update_text, ', '.join(available)))
        return


    # -----------------------------------------------------------------------
    # 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 = []

        intro = ['Welcome to Mitter %s.' % (mitterlib.constants.version),
            '',
            'To get a list of available commands, type "help".',
            '',
            "If you start a line with something that it's not a command, " \
            'it will be considered ' \
            "a status update (so you don't need to type any commands to " \
            'just update your status.',
            '',
            'An empty line will retrieve the latest updates from your ' \
            'friends.',
            '',
            '']

        import textwrap
        wrapper = textwrap.TextWrapper()

        intros = []

        for line in intro:
            if not line:
                intros.append('')   # textwrap doesn't like empty lines
            else:
                for reident in wrapper.wrap(line):
                    intros.append(reident)

        self.intro = '\n'.join(intros)
        self.prompt = 'Mitter> '

        return

    def __call__(self):
        """Make the object callable; that's the only requirement for
        Mitter."""
        warnings.simplefilter('error')  # Warnings are exceptions
        self.cmdloop()
        return

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