# -*- coding: utf-8 -*-
#
# File: portato/gui/views.py
# This file is part of the Portato-Project, a graphical portage-frontend.
#
# Copyright (C) 2006-2010 René 'Necoro' Neumann
# This is free software.  You may redistribute copies of it under the terms of
# the GNU General Public License version 2.
# There is NO WARRANTY, to the extent permitted by law.
#
# Written by René 'Necoro' Neumann <necoro@necoro.net>



import gtk, gobject
import pango
import gtksourceview2
import logging

from ..helper import warning
from ..log import add_handler

class LazyView (object):
    def __init__ (self):
        self.connect("map", self.cb_mapped)

        self.pkg = None
        self.updated = False

    def update (self, pkg, force = False):
        self.pkg = pkg
        self.updated = True
        
        if force:
            self.cb_mapped()

    def cb_mapped (self, *args):
        if self.updated and self.pkg:
            self.set_text("".join(self._get_content()))
            self.updated = False

        return False

    def set_text (self, text):
        raise NotImplementedError

    def _get_content (self):
        raise NotImplementedError

class LazyStoreView (gtk.TreeView, LazyView):
    def __init__ (self, update_fn):
        gtk.TreeView.__init__(self)
        LazyView.__init__(self)

        self.update_fn = update_fn

    def cb_mapped (self, *args):
        if self.updated and self.pkg:
            self.set_model(self.update_fn(self.pkg))
            self.updated = False

        return False

class ListView (gtk.TextView, LazyView):

    def __init__ (self, content_fn):
        self.content_fn = content_fn

        gtk.TextView.__init__(self)
        LazyView.__init__(self)

        self.set_editable(False)
        self.set_cursor_visible(False)

    def set_text (self, text):
        self.get_buffer().set_text(text)

    def _get_content (self):
        return self.content_fn(self.pkg)

class InstalledOnlyView (ListView):
    def _get_content (self):
        if self.pkg:
            if not self.pkg.is_installed():
                return _("Package is not installed")
            else:
                return ListView._get_content(self)
        else:
            return "Huh?"

class HighlightView (gtksourceview2.View, LazyView):

    def __init__ (self, get_file_fn, languages = []):
        self.get_fn = get_file_fn

        man = gtksourceview2.LanguageManager()
        
        language = None
        old_lang = None
        for lang in languages:
            if old_lang:
                warning(_("No %(old)s language file installed. Falling back to %(new)s."), {"old" : old_lang, "new" : lang})
            
            language = man.get_language(lang)
            if language:
                break
            else:
                old_lang = lang

        if not language and old_lang:
            warning(_("No %(old)s language file installed. Disabling highlighting."), {"old" : old_lang})

        buf = gtksourceview2.Buffer()
        buf.set_language(language)

        gtksourceview2.View.__init__(self, buf)
        LazyView.__init__(self)

        self.set_editable(False)
        self.set_cursor_visible(False)

    def set_text (self, text):
        self.get_buffer().set_text(text)
    
    def _get_content (self):
        try:
            with open(self.get_fn(self.pkg)) as f:
                return f.readlines()
        except IOError as e:
            return _("Error: %s") % e.strerror
    
class LogView (logging.Handler):

    colors = (
            (logging.DEBUG, "debug", "blue"),
            (logging.INFO, "info", "green"),
            (logging.WARNING, "warning", "yellow"),
            (-1, "error", "red")
            )

    def __init__ (self, view):
        logging.Handler.__init__(self, logging.DEBUG)

        self.view = view
        self.buf = view.get_buffer()

        # set tags
        for lvl, name, color in self.colors:
            self.buf.create_tag("log_%s" % name, foreground = color,weight = pango.WEIGHT_BOLD)
        
        add_handler(self)

    def emit (self, record):
        
        for lvl, name, color in self.colors:
            if lvl == -1 or record.levelno <= lvl:
                tag = "log_%s" % name
                break

        def _add():
            self.buf.insert_with_tags_by_name(self.buf.get_end_iter(), "* ", tag)
            self.buf.insert(self.buf.get_end_iter(), record.getMessage()+"\n")

        gobject.idle_add(_add) # logger might be called from another thread