# encoding: UTF-8
# api: streamtuner2
# type: base
# category: ui
# title: Channel plugins
# description: Base implementation for channels and feature plugins
# version: 1.1
# license: public domain
# author: mario
# url: http://fossil.include-once.org/streamtuner2/
# pack:
#    bookmarks.py configwin.py streamedit.py history.py search.py links.py 
#    icast.py internet_radio.py itunes.py jamendo.py live365.py global_key.py
#    modarchive.py myoggradio.py punkcast.py radiobrowser.py radiotray.py
#    shoutcast.py surfmusik.py timer.py tunein.py xiph.py youtube.py
# config: -
# priority: core
#
#
# Just exports GenericChannel and ChannelPlugin.
# GenericChannel implements the basic GUI functions and defines
# the default channel data structure. It implements base and
# fallback logic for all other channel implementations.
#
# Built-in channels derive directly from generic. Additional
# channels don't have a pre-defined Notebook tab in the glade
# file. They derive from the ChannelPlugins class instead, which
# adds the required gtk Widgets manually.
#
# Makes module scanning available.  Checks for conf.share, so
# should pick up /usr/share/streamtuner2/channels/*.py plugins
# as well as local ./channels/*.* - Needs rework for in-zip
# searching.
#

import gtk
from uikit import uikit
from config import *
import ahttp as http
import action
import favicon
import os.path
import xml.sax.saxutils
import re
import copy
import inspect


# Only export plugin classes
__all__ = [
    "GenericChannel", "ChannelPlugin"
]



# generic channel module                            ---------------------------------------
class GenericChannel(object):

    # desc
    meta = { "config": [] }
    homepage = "http://fossil.include-once.org/streamtuner2/"
    base_url = ""
    listformat = "audio/x-scpls"
    audioformat = "audio/mpeg" # fallback value
    config = []
    has_search = False

    # categories
    categories = ["empty", ]
    catmap = {}
    current = ""
    default = "empty"
    shown = None     # last selected entry in stream list, also indicator if notebook tab has been selected once / stream list of current category been displayed yet

    # gui + data
    streams = {}      #meta information dicts
    liststore = {}    #gtk data structure
    gtk_list = None   #gtk widget
    gtk_cat = None    #gtk widget

    # mapping of stream{} data into gtk treeview/treestore representation
    datamap = [
       # coltitle   width	[ datasrc key, type, renderer, attrs ]	[cellrenderer2], ...
       ["",		20,	["state",	str,  "pixbuf",	{}],	],
       ["Genre",	65,	['genre',	str,	"t",	{}],	],
       ["Station Title",275,["title",	str,    "text",	{"strikethrough":11, "cell-background":12, "cell-background-set":13}],  ["favicon", gtk.gdk.Pixbuf, "pixbuf", {}], ],
       ["Now Playing",185,	["playing",	str,	"text",	{"strikethrough":11}],	],                                                                             #{"width":20}
       ["Listeners", 45,	["listeners",	int,	"t",	{"strikethrough":11}],	],
      #["Max",	45,	["max",		int,	"t",	{}],	],
       ["Bitrate",	35,	["bitrate",	int,	"t",	{}],	],
       ["Homepage",	160,	["homepage",	str,	"t",	{"underline":10}],	],
       [False,	25,	["url",		str,	"t",	{"strikethrough":11}],	],
       [False,	0,	["format",	str,	None,	{}],	],
       [False,	0,	["favourite",	bool,	None,	{}],	],
       [False,	0,	["deleted",	bool,	None,	{}],	],
       [False,	0,	["search_col",	str,	None,	{}],	],
       [False,	0,	["search_set",	bool,	None,	{}],	],
    ]
    rowmap = []   # [state,genre,title,...] field enumeration still needed separately
    titles = {}   # for easier adapting of column titles in datamap

    # for empty grouping / categories
    placeholder = [dict(genre="./.", title="Subcategory placeholder", playing="./.", url="none:", listeners=0, bitrate=0, homepage="", state="gtk-folder")]
    empty_stub = [dict(genre="./.", title="No categories found (HTTP error)", playing="Try Channel→Reload Categories later..", url="none:", listeners=0, bitrate=0, homepage="", state="gtk-stop")]
    
    # regex            
    rx_www_url = re.compile("""(www(\.\w+[\w-]+){2,}|(\w+[\w-]+[ ]?\.)+(com|FM|net|org|de|PL|fr|uk))""", re.I)


    # constructor
    def __init__(self, parent=None):
    
        #self.streams = {}
        self.gtk_list = None
        self.gtk_cat = None
        self.module = self.__class__.__name__
        self.meta = plugin_meta(src = inspect.getcomments(inspect.getmodule(self)))
        self.config = self.meta.get("config", [])
        self.title = self.meta.get("title", self.module)

        # add default options values to config.conf.* dict
        conf.add_plugin_defaults(self.meta, self.module)

        # only if streamtuner2 is run in graphical mode        
        if (parent):
            self.cache()
            self.gui(parent)
        pass
        
        
    # These are all implemented in main (where they don't belong!)
    def stations(self):
        return self.streams.get(self.current, [])
    def rowno(self):
        pass
    def row(self):
        pass
    

    # read previous channel/stream data, if there is any
    def cache(self):
        # stream list
        cache = conf.load("cache/" + self.module)
        if (cache):
            self.streams = cache
        # categories
        cache = conf.load("cache/categories_" + self.module)
        if (cache):
            self.categories = cache
        # catmap (optional)
        cache = conf.load("cache/catmap_" + self.module)
        if (cache):
            self.catmap = cache
        pass

        
    # initialize Gtk widgets / data objects
    def gui(self, parent):
        #print(self.module + ".gui()")

        # save reference to main window/glade API
        self.parent = parent
        self.gtk_list = parent.get_widget(self.module+"_list")
        self.gtk_cat = parent.get_widget(self.module+"_cat")
        
        # category tree
        self.display_categories()
        #uikit.tree(self.gtk_cat, self.categories, title="Category", icon=gtk.STOCK_OPEN);
        
        # update column names
        for field,title in list(self.titles.items()):
            self.update_datamap(field, title=title)
        
        # prepare stream list
        if (not self.rowmap):
            for row in self.datamap:
                for x in range(2, len(row)):
                    self.rowmap.append(row[x][0])

        # load default category
        if (self.current):
            self.load(self.current)
        else:
            uikit.columns(self.gtk_list, self.datamap, [])
            
        # add to main menu
        uikit.add_menu([parent.channelmenuitems], self.meta["title"], lambda w: parent.channel_switch_by_name(self.module) or 1)

        
    # make private copy of .datamap and modify field (title= only ATM)
    def update_datamap(self, search="name", title=None):
        if self.datamap == GenericChannel.datamap:
            self.datamap = copy.deepcopy(self.datamap)
        for i,row in enumerate(self.datamap):
            if row[2][0] == search:
                row[0] = title


    # switch stream category,
    # load data,
    # update treeview content
    def load(self, category, force=False):

        # get data from cache or download
        if (force or not category in self.streams):
            __print__(dbg.PROC, "load", "update_streams")
            self.parent.status("Updating streams...")
            self.parent.status(-0.1)
            if category == "empty":
                new_streams = self.empty_stub
            else:
                new_streams = self.update_streams(category)
  
            if new_streams:

                # check and modify entry;
                # assert that title and url are present
                modified = []
                for row in new_streams:
                    if len(set(["", None]) & set([row.get("title"), row.get("url")])):
                        continue
                    try:
                        modified.append( self.postprocess(row) )
                    except Exception as e:
                        __print__(e, dbg.DATA, "Missing title or url. Postprocessing failed:", row)
                new_streams = modified
  
                # don't lose forgotten streams
                if conf.retain_deleted:
                   self.streams[category] = new_streams + self.deleted_streams(new_streams, self.streams.get(category,[]))
                else:
                   self.streams[category] = new_streams
  
                # save in cache
                self.save()
  
                # invalidate gtk list cache
                #if (self.liststore.has_key(category)):
                #    del self.liststore[category]
  
            else:
                # parse error
                self.parent.status("category parsed empty.")
                self.streams[category] = [{"title":"no contents found on directory server","bitrate":0,"max":0,"listeners":0,"playing":"error","favourite":0,"deleted":0}]
                __print__(dbg.INFO, "Oooops, parser returned nothing for category " + category)
                
        # assign to treeview model
        #self.streams[self.default] = []
        #if (self.liststore.has_key(category)):  # was already loded before
        #    self.gtk_list.set_model(self.liststore[category])
        #else:   # currently list is new, had not been converted to gtk array before
        #    self.liststore[category] = \
        uikit.do(lambda:uikit.columns(self.gtk_list, self.datamap, self.prepare(self.streams[category])))

        # set pointer
        self.current = category
        self.parent.status("")
        self.parent.status(1.0)
        pass
        
    # store current streams data
    def save(self):
        conf.save("cache/" + self.module, self.streams, gz=1)


    # called occasionally while retrieving and parsing
    def update_streams_partially_done(self, entries):
        uikit.do(lambda: uikit.columns(self.gtk_list, self.datamap, entries))

        
    # finds differences in new/old streamlist, marks deleted with flag
    def deleted_streams(self, new, old):
        diff = []
        new = [row.get("url","http://example.com/") for row in new]
        for row in old:
            if ("url" in row and (row.get("url") not in new)):
                row["deleted"] = 1
                diff.append(row)
        return diff

    
    # prepare data for display
    #
    #  - favourite icon
    #  - or deleted icon
    #
    def prepare(self, streams):
        #__print__(dbg.PROC, "prepare", streams)

        for i,row in enumerate(streams):
                                        # oh my, at least it's working
                                        # at start the bookmarks module isn't fully registered at instantiation in parent.channels{} - might want to do that step by step rather
                                        # then display() is called too early to take effect - load() & co should actually be postponed to when a notebook tab gets selected first
                                        # => might be fixed now, 1.9.8
            # state icon: bookmark star
            if (conf.show_bookmarks and "bookmarks" in self.parent.channels and self.parent.bookmarks.is_in(streams[i].get("url", "file:///tmp/none"))):
                streams[i]["favourite"] = 1
            
            # state icon: INFO or DELETE
            if (not row.get("state")):
                if row.get("favourite"):
                    streams[i]["state"] = gtk.STOCK_ABOUT
                if conf.retain_deleted and row.get("deleted"):
                    streams[i]["state"] = gtk.STOCK_DELETE
                  
            # guess homepage url  
            #self.postprocess(row)
            
            # favicons?
            if conf.show_favicons:
            
                # entry provides its own image
                if "img" in row:
                    favicon_url = row["img"]
                    streams[i]["favicon"] = favicon.localcopy(favicon_url)
                
                # get actual homepage favicon.png
                elif "homepage" in row:
                    homepage_url = row.get("homepage")
                    # check for availability of PNG file, inject local icons/ filename
                    if homepage_url and favicon.available(homepage_url):
                        streams[i]["favicon"] = favicon.file(homepage_url)
            
        return streams


    # data preparations directly after reload
    #
    # - drop shoutcast homepage links
    # - or find homepage name in title
    #
    def postprocess(self, row):

        # remove non-homepages from shoutcast
        if row.get("homepage") and row["homepage"].find("//yp.shoutcast.")>0:
            row["homepage"] = ""
            
        # deduce homepage URLs from title
        # by looking for www.xyz.com domain names
        if not row.get("homepage"):
            url = self.rx_www_url.search(row.get("title", ""))
            if url:
                url = url.group(0).lower().replace(" ", "")
                url = (url if url.find("www.") == 0 else "www."+url)
                row["homepage"] = http.fix_url(url)
        
        return row

        

    # reload current stream from web directory
    def reload(self):
        self.load(self.current, force=1)
    def switch(self):
        self.load(self.current, force=0)
    
    # update streams pane if currently selected (used by bookmarks.links channel)
    def reload_if_current(self, category):
        if self.current == category:
            self.reload()
    
        
    # display .current category, once notebook/channel tab is first opened
    def first_show(self):

        if (self.shown != 55555):
            __print__(dbg.PROC, self.module+".first_show()")
        
            # if category tree is empty, initialize it
            if not self.categories:
                __print__(dbg.PROC, self.module+"first_show: reload_categories");
                #self.parent.thread(self.reload_categories)
                try:
                    self.reload_categories()
                except:
                    __print__(dbg.ERR, "HTTP error or extraction failure.")
                    self.categories = ["empty"]
                self.display_categories()
                self.current = self.categories.keys()[0]
                __print__(dbg.STAT, "Use first category as current =", self.current)
                self.load(self.current)
        
            # load current category
            else:
                __print__(dbg.STAT, self.module+".first_show(): load current category =", self.current);
                self.load(self.current)
            
            # put selection/cursor on last position
            try:
                __print__(dbg.STAT, self.module+".first_show()", "select last known category treelist position =", self.shown)
                self.gtk_list.get_selection().select_path(self.shown)
            except:
                pass
                
            # this method will only be invoked once
            self.shown = 55555


    # update categories, save, and display                
    def reload_categories(self):
    
        # get data and save
        self.update_categories()
        if self.categories:
            conf.save("cache/categories_"+self.module, self.categories)
        if self.catmap:
            conf.save("cache/catmap_" + self.module, self.catmap);

        # display outside of this non-main thread            
        uikit.do(self.display_categories)


    # insert content into gtk category list
    def display_categories(self):
    
        # remove any existing columns
        if self.gtk_cat:
            [self.gtk_cat.remove_column(c) for c in self.gtk_cat.get_columns()]
        # rebuild gtk.TreeView
        uikit.tree(self.gtk_cat, self.categories, title="Category", icon=gtk.STOCK_OPEN);

        # if it's a short list of categories, there's probably subfolders
        if len(self.categories) < 20:
            self.gtk_cat.expand_all()
            
        # select any first element
        self.gtk_cat.get_selection().select_path("0") #set_cursor
        self.currentcat()

            
    # selected category
    def currentcat(self):
        (model, iter) = self.gtk_cat.get_selection().get_selected()
        if (type(iter) == gtk.TreeIter):
            self.current = model.get_value(iter, 0)
        return self.current




    #--------------------------- actions ---------------------------------

    # invoke action.play,
    # can be overridden to provide channel-specific "play" alternative
    def play(self, row):
        if row.get("url"):

            # parameters
            audioformat = row.get("format", self.audioformat)
            listformat = row.get("listformat", self.listformat)

            # invoke audio player
            action.action.play(row["url"], audioformat, listformat)




    #--------------------------- utility functions -----------------------

    

    # remove html <tags> from string        
    def strip_tags(self, s):
        return re.sub("<.+?>", "", s)
        
    # convert audio format nick/shortnames to mime types, e.g. "OGG" to "audio/ogg"
    def mime_fmt(self, s):
        # clean string
        s = s.lower().strip()
        # rename
        map = {
            "audio/mp3":"audio/mpeg",  # Note the real mime type is /mpeg, but /mp3 is more understandable in the GUI
            "ogg":"ogg", "ogm":"ogg", "xiph":"ogg", "vorbis":"ogg", "vnd.xiph.vorbis":"ogg",
            "mp3":"mpeg", "mp":"mpeg", "mp2":"mpeg", "mpc":"mpeg", "mps":"mpeg",
            "aac+":"aac", "aacp":"aac",
            "realaudio":"x-pn-realaudio", "real":"x-pn-realaudio", "ra":"x-pn-realaudio", "ram":"x-pn-realaudio", "rm":"x-pn-realaudio",
            # yes, we do video
            "flv":"video/flv", "mp4":"video/mp4",
        }
        map.update(action.action.lt)   # list type formats (.m3u .pls and .xspf)
        if map.get(s):
            s = map[s]
        # add prefix:
        if s.find("/") < 1:
            s = "audio/" + s
        #
        return s
    
    # remove SGML/XML entities
    def entity_decode(self, s):
        return xml.sax.saxutils.unescape(s)
    
    # convert special characters to &xx; escapes
    def xmlentities(self, s):
        return xml.sax.saxutils.escape(s)
    
    # Extracts integer from string
    def to_int(self, s):
        i = re.findall("\d+", s) or [0]
        return int(i[0])









# channel plugin without glade-pre-defined notebook tab
#
class ChannelPlugin(GenericChannel):

    module = "abstract"

    def gui(self, parent):

        if not parent:
            return

        module = self.__class__.__name__
        # two panes
        vbox = gtk.HPaned()
        vbox.show()
        # category treeview
        sw1 = gtk.ScrolledWindow()
        sw1.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
        sw1.set_property("width_request", 150)
        sw1.show()
        tv1 = gtk.TreeView()
        tv1.set_property("width_request", 75)
        tv1.set_property("enable_tree_lines", True)
        tv1.connect("button_release_event", parent.on_category_clicked)
        tv1.show()
        sw1.add(tv1)
        vbox.pack1(sw1, resize=False, shrink=True)
        # stream list
        sw2 = gtk.ScrolledWindow()
        sw2.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
        sw2.show()
        tv2 = gtk.TreeView()
        tv2.set_property("width_request", 200)
        tv2.set_property("enable_tree_lines", True)
        tv2.connect("row_activated", parent.on_play_clicked)
        tv2.show()
        sw2.add(tv2)
        vbox.pack2(sw2, resize=True, shrink=True)

        # prepare label
        pixbuf = None
        if "png" in self.meta:
            pixbuf = uikit.pixbuf(self.meta["png"])
        else:
            png = get_data("channels/" + self.module + ".png")
            pixbuf = uikit.pixbuf(png)
        if pixbuf:
            icon = gtk.image_new_from_pixbuf(pixbuf)
        else:
            icon = gtk.image_new_from_stock(gtk.STOCK_DIRECTORY, size=1)
        label = gtk.HBox()
        label.pack_start(icon, expand=False, fill=True)
        label.pack_start(gtk.Label(self.meta.get("title", self.module)), expand=True, fill=True)
            
        # pack it into an event container to catch double-clicks
        ev_label = gtk.EventBox()
        ev_label.add(label)
        ev_label.connect('event', parent.on_homepage_channel_clicked)
        plain_label = gtk.Label(self.module)

        # to widgets
        self.gtk_cat = tv1
        parent.widgets[module + "_cat"] = tv1
        self.gtk_list = tv2
        parent.widgets[module + "_list"] = tv2
        ev_label.show_all()
        vbox.show_all()
        parent.widgets["v_" + module] = vbox
        parent.widgets["c_" + module] = ev_label
        tv2.connect('button-press-event', parent.station_context_menu)


        # try to initialize superclass now, before adding to channel tabs
        GenericChannel.gui(self, parent)

        # add notebook tab
        tab = parent.notebook_channels.insert_page_menu(vbox, ev_label, plain_label, -1)
        parent.notebook_channels.set_tab_reorderable(vbox, True)

