#!/usr/local/bin/python2.7
# -*- coding: utf-8 -*-

#
# gPodder - A media aggregator and podcast client
# Copyright (c) 2005-2012 Thomas Perl and the gPodder Team
#
# gPodder 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.
#
# gPodder 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/>.
#


# gpo - A better command-line interface to gPodder using the gPodder API
# by Thomas Perl <thp@gpodder.org>; 2009-05-07


"""
  Usage: gpo [--verbose|-v] [COMMAND] [params...]

  - Subscription management -

    subscribe URL [TITLE]      Subscribe to a new feed at URL (as TITLE)
    search QUERY               Search the gpodder.net directory for QUERY
    toplist                    Show the gpodder.net top-subscribe podcasts

    import FILENAME|URL        Subscribe to all podcasts in an OPML file
    export FILENAME            Export all subscriptions to an OPML file

    rename URL TITLE           Rename feed at URL to TITLE
    unsubscribe URL            Unsubscribe from feed at URL
    enable URL                 Enable feed updates for the feed at URL
    disable URL                Disable feed updates for the feed at URL

    info URL                   Show information about feed at URL
    list                       List all subscribed podcasts
    update [URL]               Check for new episodes (all or only at URL)

  - Episode management -

    download [URL]             Download new episodes (all or only from URL)
    pending [URL]              List new episodes (all or only from URL)
    episodes [URL]             List episodes (all or only from URL)

  - Configuration -

    set [key] [value]          List one (all) keys or set to a new value

  - Other commands -

    youtube URL                Resolve the YouTube URL to a download URL
    rewrite OLDURL NEWURL      Change the feed URL of [OLDURL] to [NEWURL]
    webui [public]             Start gPodder's Web UI server
                               (public = listen on all network interfaces)

"""

import sys
import collections
import os
import re
import inspect
import functools
try:
    import readline
except ImportError:
    readline = None
import shlex
import pydoc
import logging

try:
    import termios
    import fcntl
    import struct
except ImportError:
    termios = None
    fcntl = None
    struct = None

# A poor man's argparse/getopt - but it works for our use case :)
verbose = False
for flag in ('-v', '--verbose'):
    if flag in sys.argv:
        sys.argv.remove(flag)
        verbose = True
        break

gpodder_script = sys.argv[0]
if os.path.islink(gpodder_script):
    gpodder_script = os.readlink(gpodder_script)
gpodder_dir = os.path.join(os.path.dirname(gpodder_script), '..')
prefix = os.path.abspath(os.path.normpath(gpodder_dir))

src_dir = os.path.join(prefix, 'src')

if os.path.exists(os.path.join(src_dir, 'gpodder', '__init__.py')):
    # Run gPodder from local source folder (not installed)
    sys.path.insert(0, src_dir)

import gpodder
_ = gpodder.gettext
N_ = gpodder.ngettext

gpodder.prefix = prefix

# This is the command-line UI variant
gpodder.ui.cli = True

# Platform detection (i.e. Maemo 5, etc..)
gpodder.detect_platform()

from gpodder import api
from gpodder import my
from gpodder import opml
from gpodder import util
from gpodder import log
from gpodder.config import config_value_to_string

have_ansi = sys.stdout.isatty() and not gpodder.win32
interactive_console = sys.stdin.isatty() and sys.stdout.isatty()
is_single_command = False

log.setup(verbose)

def incolor(color_id, s):
    if have_ansi and cli.config.ui.cli.colors:
        return '\033[9%dm%s\033[0m' % (color_id, s)
    return s

def safe_print(*args, **kwargs):
    def convert(arg):
        return unicode(util.convert_bytes(arg))

    ofile = kwargs.get('file', sys.stdout)
    output = u' '.join(map(convert, args))
    if ofile.encoding is None:
        output = util.sanitize_encoding(output)
    else:
        output = output.encode(ofile.encoding, 'replace')

    try:
        ofile.write(output)
    except Exception, e:
        print """
        *** ENCODING FAIL ***

        Please report this to http://bugs.gpodder.org/:

        args = %s
        map(convert, args) = %s

        Exception = %s
        """ % (repr(args), repr(map(convert, args)), e)

    if kwargs.get('newline', True):
        ofile.write(os.linesep)
    ofile.flush()

# ANSI Colors: red = 1, green = 2, yellow = 3, blue = 4
inred, ingreen, inyellow, inblue = (functools.partial(incolor, x)
        for x in range(1, 5))

def FirstArgumentIsPodcastURL(function):
    """Decorator for functions that take a podcast URL as first arg"""
    setattr(function, '_first_arg_is_podcast', True)
    return function

def get_terminal_size():
    if None in (termios, fcntl, struct):
        return (80, 24)

    s = struct.pack('HHHH', 0, 0, 0, 0)
    stdout = sys.stdout.fileno()
    x = fcntl.ioctl(stdout, termios.TIOCGWINSZ, s)
    rows, cols, xp, yp = struct.unpack('HHHH', x)
    return rows, cols

class gPodderCli(object):
    COLUMNS = 80
    EXIT_COMMANDS = ('quit', 'exit', 'bye')

    def __init__(self):
        self.client = api.PodcastClient()
        self.config = self.client._config

        self._current_action = ''
        self._commands = dict((name.rstrip('_'), func)
            for name, func in inspect.getmembers(self)
            if inspect.ismethod(func) and not name.startswith('_'))
        self._prefixes, self._expansions = self._build_prefixes_expansions()
        self._prefixes.update({'?': 'help'})
        self._valid_commands = sorted(self._prefixes.values())
        gpodder.user_extensions.on_ui_initialized(self.client.core.model,
                self._extensions_podcast_update_cb,
                self._extensions_episode_download_cb)

    def _build_prefixes_expansions(self):
        prefixes = {}
        expansions = collections.defaultdict(list)
        names = sorted(self._commands.keys())
        names.extend(self.EXIT_COMMANDS)

        # Generator for all prefixes of a given string (longest first)
        # e.g. ['gpodder', 'gpodde', 'gpodd', 'gpod', 'gpo', 'gp', 'g']
        mkprefixes = lambda n: (n[:x] for x in xrange(len(n), 0, -1))

        # Return True if the given prefix is unique in "names"
        is_unique = lambda p: len([n for n in names if n.startswith(p)]) == 1

        for name in names:
            is_still_unique = True
            unique_expansion = None
            for prefix in mkprefixes(name):
                if is_unique(prefix):
                    unique_expansion = '[%s]%s' % (prefix, name[len(prefix):])
                    prefixes[prefix] = name
                    continue

                if unique_expansion is not None:
                    expansions[prefix].append(unique_expansion)
                    continue

        return prefixes, expansions

    def _extensions_podcast_update_cb(self, podcast):
        self._info(_('Podcast update requested by extensions.'))
        self._update_podcast(podcast)

    def _extensions_episode_download_cb(self, episode):
        self._info(_('Episode download requested by extensions.'))
        self._download_episode(episode)

    def _start_action(self, msg, *args):
        line = msg % args
        if len(line) > self.COLUMNS-7:
            line = line[:self.COLUMNS-7-3] + '...'
        else:
            line = line + (' '*(self.COLUMNS-7-len(line)))
        self._current_action = line
        safe_print(self._current_action, newline=False)

    def _update_action(self, progress):
        if have_ansi:
            progress = '%3.0f%%' % (progress*100.,)
            result = '['+inblue(progress)+']'
            safe_print('\r' + self._current_action + result, newline=False)

    def _finish_action(self, success=True, skip=False):
        if skip:
            result = '['+inyellow('SKIP')+']'
        elif success:
            result = '['+ingreen('DONE')+']'
        else:
            result = '['+inred('FAIL')+']'

        if have_ansi:
            safe_print('\r' + self._current_action + result)
        else:
            safe_print(result)
        self._current_action = ''

    def _atexit(self):
        self.client.finish()

    # -------------------------------------------------------------------

    def import_(self, url):
        for channel in opml.Importer(url).items:
            self.subscribe(channel['url'], channel.get('title'))

    def export(self, filename):
        podcasts = self.client._model.get_podcasts()
        opml.Exporter(filename).write(podcasts)

    def subscribe(self, url, title=None):
        url = util.normalize_feed_url(url)
        if url is None:
            self._error(_('Invalid URL.'))
            return True

        if self.client.get_podcast(url) is not None:
            self._info(_('You are already subscribed to %s.') % url)
            return True

        try:
            if self.client.create_podcast(url, title) is None:
                self._error(_('Cannot subscribe to %s.') % url)
                return True
        except Exception, e:
            self._error(e.strerror)
            return True

        self.client.commit()

        self._info(_('Successfully added %s.' % url))
        return True

    def _print_config(self, search_for):
        for key in self.config.all_keys():
            if search_for is None or search_for.lower() in key.lower():
                value = config_value_to_string(self.config._lookup(key))
                safe_print(key, '=', value)

    def set(self, key=None, value=None):
        if value is None:
            self._print_config(key)
            return

        try:
            current_value = self.config._lookup(key)
            current_type = type(current_value)
        except KeyError:
            self._error(_('This configuration option does not exist.'))
            return

        if current_type == dict:
            self._error(_('Can only set leaf configuration nodes.'))
            return

        self.config.update_field(key, value)
        self.set(key)

    @FirstArgumentIsPodcastURL
    def rename(self, url, title):
        podcast = self.client.get_podcast(url)

        if podcast is None:
            self._error(_('You are not subscribed to %s.') % url)
        else:
            old_title = podcast.title
            podcast.rename(title)
            self.client.commit()
            self._info(_('Renamed %(old_title)s to %(new_title)s.') % {
                'old_title': util.convert_bytes(old_title),
                'new_title': util.convert_bytes(title),
            })

        return True

    @FirstArgumentIsPodcastURL
    def unsubscribe(self, url):
        podcast = self.client.get_podcast(url)

        if podcast is None:
            self._error(_('You are not subscribed to %s.') % url)
        else:
            podcast.delete()
            self.client.commit()
            self._error(_('Unsubscribed from %s.') % url)

        return True

    def _episodesList(self, podcast):
        def status_str(episode):
            if episode.is_new:
                return u' * '
            if episode.is_downloaded:
                return u' ▉ '
            if episode.is_deleted:
                return u' ░ '
    
            return u'   '

        episodes = (u'%3d. %s %s' % (i+1, status_str(e), e.title)
                for i, e in enumerate(podcast.get_episodes()))
        return episodes

    @FirstArgumentIsPodcastURL
    def info(self, url):
        podcast = self.client.get_podcast(url)

        if podcast is None:
            self._error(_('You are not subscribed to %s.') % url)
        else:
            title, url, status = podcast.title, podcast.url, podcast.feed_update_status_msg()
            episodes = self._episodesList(podcast)
            episodes = u'\n      '.join(episodes)
            self._pager(u"""
    Title: %(title)s
    URL: %(url)s
    Feed update is %(status)s

    Episodes:
      %(episodes)s
            """ % locals())

        return True

    @FirstArgumentIsPodcastURL
    def episodes(self, url=None):
        output = []
        for podcast in self.client.get_podcasts():
            podcast_printed = False
            if url is None or podcast.url == url:
                episodes = self._episodesList(podcast)
                episodes = u'\n      '.join(episodes)
                output.append(u"""
    Episodes from %s:
      %s
""" % (podcast.url, episodes))

        self._pager(u'\n'.join(output))
        return True

    def list(self):
        for podcast in self.client.get_podcasts():
            if podcast.update_enabled():
                safe_print('#', ingreen(podcast.title))
            else:
                safe_print('#', inred(podcast.title),
                        '-', _('Updates disabled'))

            safe_print(podcast.url)

        return True

    def _update_podcast(self, podcast):
        self._start_action('Updating %s', podcast.title)
        try:
            podcast.update()
            self._finish_action()
        except Exception, e:
            self._finish_action(False)

    def _pending_message(self, count):
        return N_('%(count)d new episode', '%(count)d new episodes',
                count) % {'count': count}

    @FirstArgumentIsPodcastURL
    def update(self, url=None):
        count = 0
        for podcast in self.client.get_podcasts():
            if url is not None and podcast.url != url:
                continue

            if podcast.update_enabled():
                self._update_podcast(podcast)
                count += sum(1 for e in podcast.get_episodes() if e.is_new)
            else:
                self._start_action(_('Skipping %(podcast)s') % {
                    'podcast': podcast.title})
                self._finish_action(skip=True)

        safe_print(inblue(self._pending_message(count)))
        return True

    @FirstArgumentIsPodcastURL
    def pending(self, url=None):
        count = 0
        for podcast in self.client.get_podcasts():
            podcast_printed = False
            if url is None or podcast.url == url:
                for episode in podcast.get_episodes():
                    if episode.is_new:
                        if not podcast_printed:
                            safe_print('#', ingreen(podcast.title))
                            podcast_printed = True
                        safe_print(' ', episode.title)
                        count += 1

        safe_print(inblue(self._pending_message(count)))
        return True

    def _download_episode(self, episode):
        self._start_action('Downloading %s', episode.title)
        episode.download(self._update_action)
        self._finish_action()

    @FirstArgumentIsPodcastURL
    def download(self, url=None):
        count = 0
        for podcast in self.client.get_podcasts():
            podcast_printed = False
            if url is None or podcast.url == url:
                for episode in podcast.get_episodes():
                    if episode.is_new:
                        if not podcast_printed:
                            safe_print(inblue(podcast.title))
                            podcast_printed = True
                        self._download_episode(episode)
                        count += 1

        safe_print(count, 'episodes downloaded.')
        return True

    @FirstArgumentIsPodcastURL
    def disable(self, url):
        podcast = self.client.get_podcast(url)

        if podcast is None:
            self._error(_('You are not subscribed to %s.') % url)
        else:
            podcast.disable()
            self.client.commit()
            self._error(_('Disabling feed update from %s.') % url)

        return True

    @FirstArgumentIsPodcastURL
    def enable(self, url):
        podcast = self.client.get_podcast(url)

        if podcast is None:
            self._error(_('You are not subscribed to %s.') % url)
        else:
            podcast.enable()
            self.client.commit()
            self._error(_('Enabling feed update from %s.') % url)

        return True

    def youtube(self, url):
        yurl = self.client.youtube_url_resolver(url)
        safe_print(yurl)
        return True

    def webui(self, public=None):
        from gpodder import webui
        if public == 'public':
            # Warn the user that the web UI is listening on all network
            # interfaces, which could lead to problems.
            # Only use this on a trusted, private network!
            self._warn(_('Listening on ALL network interfaces.'))
            webui.main(only_localhost=False, core=self.client.core)
        else:
            webui.main(core=self.client.core)

    def search(self, *terms):
        query = ' '.join(terms)
        if not query:
            return

        directory = my.Directory()
        results = directory.search(query)
        self._show_directory_results(results)

    def toplist(self):
        directory = my.Directory()
        results = directory.toplist()
        self._show_directory_results(results, True)

    def _show_directory_results(self, results, multiple=False):
        if not results:
            self._error(_('No podcasts found.'))
            return

        if not interactive_console or is_single_command:
            safe_print('\n'.join(url for title, url in results))
            return

        def show_list():
            self._pager('\n'.join(u'%3d: %s\n     %s' %
                (index+1, title, url if title != url else '')
                for index, (title, url) in enumerate(results)))

        show_list()

        msg = _('Enter index to subscribe, ? for list')
        while True:
            index = raw_input(msg + ': ')

            if not index:
                return

            if index == '?':
                show_list()
                continue

            try:
                index = int(index)
            except ValueError:
                self._error(_('Invalid value.'))
                continue

            if not (1 <= index <= len(results)):
                self._error(_('Invalid value.'))
                continue

            title, url = results[index-1]
            self._info(_('Adding %s...') % title)
            self.subscribe(url)
            if not multiple:
                break

    @FirstArgumentIsPodcastURL
    def rewrite(self, old_url, new_url):
        podcast = self.client.get_podcast(old_url)
        if podcast is None:
            self._error(_('You are not subscribed to %s.') % old_url)
        else:
            result = podcast.rewrite_url(new_url)
            if result is None:
                self._error(_('Invalid URL: %s') % new_url)
            else:
                new_url = result
                self._error(_('Changed URL from %(old_url)s to %(new_url)s.') %
                {
                    'old_url': old_url,
                    'new_url': new_url,
                })
        return True

    def help(self):
        safe_print(stylize(__doc__), file=sys.stderr, newline=False)
        return True

    # -------------------------------------------------------------------

    def _pager(self, output):
        if have_ansi:
            # Need two additional rows for command prompt
            rows_needed = len(output.splitlines()) + 2
            rows, cols = get_terminal_size()
            if rows_needed < rows:
                safe_print(output)
            else:
                pydoc.pager(util.sanitize_encoding(output))
        else:
            safe_print(output)

    def _shell(self):
        safe_print(os.linesep.join(x.strip() for x in ("""
        gPodder %(__version__)s "%(__relname__)s" (%(__date__)s) - %(__url__)s
        %(__copyright__)s
        License: %(__license__)s

        Entering interactive shell. Type 'help' for help.
        Press Ctrl+D (EOF) or type 'quit' to quit.
        """ % gpodder.__dict__).splitlines()))

        if readline is not None:
            readline.parse_and_bind('tab: complete')
            readline.set_completer(self._tab_completion)
            readline.set_completer_delims(' ')

        while True:
            try:
                line = raw_input('gpo> ')
            except EOFError:
                safe_print('')
                break
            except KeyboardInterrupt:
                safe_print('')
                continue

            if self._prefixes.get(line, line) in self.EXIT_COMMANDS:
                break

            try:
                args = shlex.split(line)
            except ValueError, value_error:
                self._error(_('Syntax error: %(error)s') %
                        {'error': value_error})
                continue

            try:
                self._parse(args)
            except KeyboardInterrupt:
                self._error('Keyboard interrupt.')
            except EOFError:
                self._error('EOF.')

        self._atexit()

    def _error(self, *args):
        safe_print(inred(' '.join(args)), file=sys.stderr)

    # Warnings look like error messages for now
    _warn = _error

    def _info(self, *args):
        safe_print(*args)

    def _checkargs(self, func, command_line):
        args, varargs, keywords, defaults = inspect.getargspec(func)
        args.pop(0) # Remove "self" from args
        defaults = defaults or ()
        minarg, maxarg = len(args)-len(defaults), len(args)

        if len(command_line) < minarg or (len(command_line) > maxarg and \
                varargs is None):
            self._error('Wrong argument count for %s.' % func.__name__)
            return False

        return func(*command_line)

    def _tab_completion_podcast(self, text, count):
        """Tab completion for podcast URLs"""
        urls = [p.url for p in self.client.get_podcasts() if text in p.url]
        if count < len(urls):
            return urls[count]

        return None


    def _tab_completion(self, text, count):
        """Tab completion function for readline"""
        if readline is None:
            return None

        current_line = readline.get_line_buffer()
        if text == current_line:
            for name in self._valid_commands:
                if name.startswith(text):
                    if count == 0:
                        return name
                    else:
                        count -= 1
        else:
            args = current_line.split()
            command = args.pop(0)
            command_function = getattr(self, command, None)
            if not command_function:
                return None
            if getattr(command_function, '_first_arg_is_podcast', False):
                if not args or (len(args) == 1 and not current_line.endswith(' ')):
                    return self._tab_completion_podcast(text, count)

        return None


    def _parse_single(self, command_line):
        try:
            result = self._parse(command_line)
        except KeyboardInterrupt:
            self._error('Keyboard interrupt.')
            result = -1
        self._atexit()
        return result

    def _parse(self, command_line):
        if not command_line:
            return False

        command = command_line.pop(0)

        # Resolve command aliases
        command = self._prefixes.get(command, command)

        if command in self._commands:
            func = self._commands[command]
            if inspect.ismethod(func):
                return self._checkargs(func, command_line)

        if command in self._expansions:
            safe_print(_('Ambigous command. Did you mean..'))
            for cmd in self._expansions[command]:
                safe_print('   ', inblue(cmd))
        else:
            self._error(_('The requested function is not available.'))

        return False


def stylize(s):
    s = re.sub(r'    .{27}', lambda m: inblue(m.group(0)), s)
    s = re.sub(r'  - .*', lambda m: ingreen(m.group(0)), s)
    return s

if __name__ == '__main__':
    cli = gPodderCli()
    args = sys.argv[1:]
    if args:
        is_single_command = True
        cli._parse_single(args)
    elif interactive_console:
        cli._shell()
    else:
        safe_print(__doc__, newline=False)

