# Favourite lists.
#
# This module lists static content from ~/.config/streamtuner2/bookmarks.json.
# Any bookmarked station will appear with a star ★ icon in other channels.
#
# Some feature extensions inject custom subcategories here. For example the
# "search" feature adds its own result list here, as does the "timer" plugin.
#
#

from config import *
from uikit import uikit
from channels import *



# The bookmarks tab is a core feature and built into the GtkBuilder
# layout. Which is why it derives from GenericChannel, and requires
# less setup.
#
# Furthermore it pretty much only handles a static streams{} list.
# Sub-plugins simply append a new category, and populate the streams
# list themselves.
#
# It's accessible as `main.bookmarks` in the ST2 window and elsewhere.
#
class bookmarks(GenericChannel):

        # desc
        module = "bookmarks"
        title = "bookmarks"
        base_url = "file:.config/streamtuner2/bookmarks.json"
        listformat = "*/*"

        # content
        categories = ["favourite", ]  # timer, links, search, and links show up as needed
        current = "favourite"
        default = "favourite"
        streams = {"favourite":[], "search":[], "scripts":[], "timer":[], "history":[], }
        

        # cache list, to determine if a PLS url is bookmarked
        urls = []
        
        
        
        def gui(self, parent):
            GenericChannel.gui(self, parent)
            parent.notebook_channels.set_menu_label_text(parent.v_bookmarks, "bookmarks")


        # this channel does not actually retrieve/parse data from anywhere
        def update_categories(self):
            pass
            
        # but category sub-plugins might provide a hook
        category_plugins = {}
        def update_streams(self, cat):
            if cat in self.category_plugins:
                return self.category_plugins[cat].update_streams(cat) or []
            else:
                return self.streams.get(cat, [])

            
        # streams are already loaded at instantiation
        def first_show(self):
            pass


        # all entries just come from "bookmarks.json"
        def cache(self):
            # stream list
            cache = conf.load(self.module)
            if (cache):
                __print__(dbg.PROC, "load bookmarks.json")
                self.streams = cache
            


        # save to cache file
        def save(self):
            conf.save(self.module, self.streams, nice=1)


        # checks for existence of an URL in bookmarks store,
        # this method is called by other channel modules' display() method
        def is_in(self, url, once=1):
            if (not self.urls):
                self.urls = [row.get("url","urn:x-streamtuner2:no") for row in self.streams["favourite"]]
            return url in self.urls


        # called from main window / menu / context menu,
        # when bookmark is to be added for a selected stream entry
        def add(self, row):
        
            # normalize data (this row originated in a gtk+ widget)
            row["favourite"] = 1
            if row.get("favicon"):
               row["favicon"] = favicon.file(row.get("homepage"))
            if not row.get("listformat"):
                row["listformat"] = main.channel().listformat
               
            # append to storage
            self.streams["favourite"].append(row)
            self.save()
            self.load(self.default)
            self.urls.append(row["url"])


        # simplified gtk TreeStore display logic (just one category for the moment, always rebuilt)
        def load(self, category, force=False):
            __print__(dbg.UI, category, self.streams.keys())
            self.streams[category] = self.update_streams(category)
            #self.liststore[category] = \
            uikit.columns(self.gtk_list, self.datamap, self.prepare(self.streams[category]))


        # add a categories[]/streams{} subcategory, update treeview
        def add_category(self, cat, plugin=None):
            if cat not in self.categories: # add category if missing
                self.categories.append(cat)
                self.display_categories()
            if cat not in self.streams:
                self.streams[cat] = []
            if plugin:
                self.category_plugins[cat] = plugin


        # change cursor
        def set_category(self, cat):
            self.add_category(cat)
            self.gtk_cat.get_selection().select_path(str(self.categories.index(cat)))
            return self.currentcat()
            
            
        # update bookmarks from freshly loaded streams data
        def heuristic_update(self, updated_channel, updated_category):

            if not conf.heuristic_bookmark_update: return
            __print__(dbg.ERR, "heuristic bookmark update")
            save = 0
            fav = self.streams["favourite"]
        
            # First we'll generate a list of current bookmark stream urls, and then
            # remove all but those from the currently UPDATED_channel + category.
            # This step is most likely redundant, but prevents accidently re-rewriting
            # stations that are in two channels (=duplicates with different PLS urls).
            check = {"http//": "[row]"}
            check = dict((row.get("url", "http//"),row) for row in fav)
            # walk through all channels/streams
            for chname,channel in main.channels.items():
                for cat,streams in channel.streams.items():

                    # keep the potentially changed rows
                    if (chname == updated_channel) and (cat == updated_category):
                        freshened_streams = streams

                    # remove unchanged urls/rows
                    else:
                        unchanged_urls = (row.get("url") for row in streams)
                        for url in unchanged_urls:
                            if url in check:
                                del check[url]
                                # directory duplicates could unset the check list here,
                                # so we later end up doing a deep comparison


            # now the real comparison,
            # where we compare station titles and homepage url to detect if a bookmark is an old entry
            for row in freshened_streams:
                url = row.get("url")
                
                # empty entry (google stations), or stream still in current favourites
                if not url or url in check:
                    pass

                # need to search
                else:
                    title = row.get("title")
                    homepage = row.get("homepage")
                    for i,old in enumerate(fav):

                        # skip if new url already in streams
                        if url == old.get("url"):
                            pass   # This is caused by channel duplicates with identical PLS links.
                        
                        # on exact matches (but skip if url is identical anyway)
                        elif title == old["title"] and homepage == old.get("homepage",homepage):
                            # update stream url
                            fav[i]["url"] = url
                            save = 1
                            
                        # more text similarity heuristics might go here
                        else:
                            pass
            
            # if there were changes
            if save: self.save()