"""
Copyright 2008, 2009, 2011 Free Software Foundation, Inc.
This file is part of GNU Radio

GNU Radio Companion 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 2
of the License, or (at your option) any later version.

GNU Radio Companion 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
"""

from Constants import \
    NEW_FLOGRAPH_TITLE, DEFAULT_REPORTS_WINDOW_WIDTH
import Actions
import pygtk
pygtk.require('2.0')
import gtk
import Bars
from BlockTreeWindow import BlockTreeWindow
from Dialogs import TextDisplay, MessageDialogHelper
from NotebookPage import NotebookPage
import Preferences
import Messages
import Utils
import os

MAIN_WINDOW_TITLE_TMPL = """\
#if not $saved
*#slurp
#end if
#if $basename
$basename#slurp
#else
$new_flowgraph_title#slurp
#end if
#if $read_only
 (read only)#slurp
#end if
#if $dirname
 - $dirname#slurp
#end if
 - $platform_name#slurp
"""

PAGE_TITLE_MARKUP_TMPL = """\
#set $foreground = $saved and 'black' or 'red'
<span foreground="$foreground">$encode($title or $new_flowgraph_title)</span>#slurp
#if $read_only
 (ro)#slurp
#end if
"""

############################################################
# Main window
############################################################

class MainWindow(gtk.Window):
    """The topmost window with menus, the tool bar, and other major windows."""

    def __init__(self, platform):
        """
        MainWindow contructor
        Setup the menu, toolbar, flowgraph editor notebook, block selection window...
        """
        self._platform = platform
        #setup window
        gtk.Window.__init__(self, gtk.WINDOW_TOPLEVEL)
        vbox = gtk.VBox()
        self.hpaned = gtk.HPaned()
        self.add(vbox)
        #create the menu bar and toolbar
        self.add_accel_group(Actions.get_accel_group())
        vbox.pack_start(Bars.MenuBar(), False)
        vbox.pack_start(Bars.Toolbar(), False)
        vbox.pack_start(self.hpaned)
        #create the notebook
        self.notebook = gtk.Notebook()
        self.page_to_be_closed = None
        self.current_page = None
        self.notebook.set_show_border(False)
        self.notebook.set_scrollable(True) #scroll arrows for page tabs
        self.notebook.connect('switch-page', self._handle_page_change)
        #setup containers
        self.flow_graph_vpaned = gtk.VPaned()
        #flow_graph_box.pack_start(self.scrolled_window)
        self.flow_graph_vpaned.pack1(self.notebook)
        self.hpaned.pack1(self.flow_graph_vpaned)
        self.btwin = BlockTreeWindow(platform, self.get_flow_graph);
        self.hpaned.pack2(self.btwin, False) #dont allow resize
        #create the reports window
        self.text_display = TextDisplay()
        #house the reports in a scrolled window
        self.reports_scrolled_window = gtk.ScrolledWindow()
        self.reports_scrolled_window.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
        self.reports_scrolled_window.add(self.text_display)
        self.reports_scrolled_window.set_size_request(-1, DEFAULT_REPORTS_WINDOW_WIDTH)
        self.flow_graph_vpaned.pack2(self.reports_scrolled_window, False) #dont allow resize
        #load preferences and show the main window
        Preferences.load(platform)
        self.resize(*Preferences.main_window_size())
        self.flow_graph_vpaned.set_position(Preferences.reports_window_position())
        self.hpaned.set_position(Preferences.blocks_window_position())
        self.show_all()
        self.reports_scrolled_window.hide()
        self.btwin.hide()

    ############################################################
    # Event Handlers
    ############################################################

    def _quit(self, window, event):
        """
        Handle the delete event from the main window.
        Generated by pressing X to close, alt+f4, or right click+close.
        This method in turns calls the state handler to quit.

        Returns:
            true
        """
        Actions.APPLICATION_QUIT()
        return True

    def _handle_page_change(self, notebook, page, page_num):
        """
        Handle a page change. When the user clicks on a new tab,
        reload the flow graph to update the vars window and
        call handle states (select nothing) to update the buttons.

        Args:
            notebook: the notebook
            page: new page
            page_num: new page number
        """
        self.current_page = self.notebook.get_nth_page(page_num)
        Messages.send_page_switch(self.current_page.get_file_path())
        Actions.PAGE_CHANGE()

    ############################################################
    # Report Window
    ############################################################

    def add_report_line(self, line):
        """
        Place line at the end of the text buffer, then scroll its window all the way down.

        Args:
            line: the new text
        """
        self.text_display.insert(line)

    ############################################################
    # Pages: create and close
    ############################################################

    def new_page(self, file_path='', show=False):
        """
        Create a new notebook page.
        Set the tab to be selected.

        Args:
            file_path: optional file to load into the flow graph
            show: true if the page should be shown after loading
        """
        #if the file is already open, show the open page and return
        if file_path and file_path in self._get_files(): #already open
            page = self.notebook.get_nth_page(self._get_files().index(file_path))
            self._set_page(page)
            return
        try: #try to load from file
            if file_path: Messages.send_start_load(file_path)
            flow_graph = self._platform.get_new_flow_graph()
            flow_graph.grc_file_path = file_path;
            #print flow_graph
            page = NotebookPage(
                self,
                flow_graph=flow_graph,
                file_path=file_path,
            )
            if file_path: Messages.send_end_load()
        except Exception, e: #return on failure
            Messages.send_fail_load(e)
            if isinstance(e, KeyError) and str(e) == "'options'":
                # This error is unrecoverable, so crash gracefully
                exit(-1)
            return
        #add this page to the notebook
        self.notebook.append_page(page, page.get_tab())
        try: self.notebook.set_tab_reorderable(page, True)
        except: pass #gtk too old
        self.notebook.set_tab_label_packing(page, False, False, gtk.PACK_START)
        #only show if blank or manual
        if not file_path or show: self._set_page(page)

    def close_pages(self):
        """
        Close all the pages in this notebook.

        Returns:
            true if all closed
        """
        open_files = filter(lambda file: file, self._get_files()) #filter blank files
        open_file = self.get_page().get_file_path()
        #close each page
        for page in self._get_pages():
            self.page_to_be_closed = page
            self.close_page(False)
        if self.notebook.get_n_pages(): return False
        #save state before closing
        Preferences.files_open(open_files)
        Preferences.file_open(open_file)
        Preferences.main_window_size(self.get_size())
        Preferences.reports_window_position(self.flow_graph_vpaned.get_position())
        Preferences.blocks_window_position(self.hpaned.get_position())
        Preferences.save()
        return True

    def close_page(self, ensure=True):
        """
        Close the current page.
        If the notebook becomes empty, and ensure is true,
        call new page upon exit to ensure that at least one page exists.

        Args:
            ensure: boolean
        """
        if not self.page_to_be_closed: self.page_to_be_closed = self.get_page()
        #show the page if it has an executing flow graph or is unsaved
        if self.page_to_be_closed.get_proc() or not self.page_to_be_closed.get_saved():
            self._set_page(self.page_to_be_closed)
        #unsaved? ask the user
        if not self.page_to_be_closed.get_saved() and self._save_changes():
            Actions.FLOW_GRAPH_SAVE() #try to save
            if not self.page_to_be_closed.get_saved(): #still unsaved?
                self.page_to_be_closed = None #set the page to be closed back to None
                return
        #stop the flow graph if executing
        if self.page_to_be_closed.get_proc(): Actions.FLOW_GRAPH_KILL()
        #remove the page
        self.notebook.remove_page(self.notebook.page_num(self.page_to_be_closed))
        if ensure and self.notebook.get_n_pages() == 0: self.new_page() #no pages, make a new one
        self.page_to_be_closed = None #set the page to be closed back to None

    ############################################################
    # Misc
    ############################################################

    def update(self):
        """
        Set the title of the main window.
        Set the titles on the page tabs.
        Show/hide the reports window.

        Args:
            title: the window title
        """
        gtk.Window.set_title(self, Utils.parse_template(MAIN_WINDOW_TITLE_TMPL,
                basename=os.path.basename(self.get_page().get_file_path()),
                dirname=os.path.dirname(self.get_page().get_file_path()),
                new_flowgraph_title=NEW_FLOGRAPH_TITLE,
                read_only=self.get_page().get_read_only(),
                saved=self.get_page().get_saved(),
                platform_name=self._platform.get_name(),
            )
        )
        #set tab titles
        for page in self._get_pages(): page.set_markup(
            Utils.parse_template(PAGE_TITLE_MARKUP_TMPL,
                #get filename and strip out file extension
                title=os.path.splitext(os.path.basename(page.get_file_path()))[0],
                read_only=page.get_read_only(), saved=page.get_saved(),
                new_flowgraph_title=NEW_FLOGRAPH_TITLE,
            )
        )
        #show/hide notebook tabs
        self.notebook.set_show_tabs(len(self._get_pages()) > 1)

    def update_pages(self):
        """
        Forces a reload of all the pages in this notebook.
        """
        for page in self._get_pages():
            success = page.get_flow_graph().reload()
            if success:  # Only set saved if errors occurred during import
                page.set_saved(False)

    def get_page(self):
        """
        Get the selected page.

        Returns:
            the selected page
        """
        return self.current_page

    def get_flow_graph(self):
        """
        Get the selected flow graph.

        Returns:
            the selected flow graph
        """
        return self.get_page().get_flow_graph()

    def get_focus_flag(self):
        """
        Get the focus flag from the current page.

        Returns:
            the focus flag
        """
        return self.get_page().get_drawing_area().get_focus_flag()

    ############################################################
    # Helpers
    ############################################################

    def _set_page(self, page):
        """
        Set the current page.

        Args:
            page: the page widget
        """
        self.current_page = page
        self.notebook.set_current_page(self.notebook.page_num(self.current_page))

    def _save_changes(self):
        """
        Save changes to flow graph?

        Returns:
            true if yes
        """
        return MessageDialogHelper(
            gtk.MESSAGE_QUESTION, gtk.BUTTONS_YES_NO, 'Unsaved Changes!',
            'Would you like to save changes before closing?'
        ) == gtk.RESPONSE_YES

    def _get_files(self):
        """
        Get the file names for all the pages, in order.

        Returns:
            list of file paths
        """
        return map(lambda page: page.get_file_path(), self._get_pages())

    def _get_pages(self):
        """
        Get a list of all pages in the notebook.

        Returns:
            list of pages
        """
        return [self.notebook.get_nth_page(page_num) for page_num in range(self.notebook.get_n_pages())]
