import gtk
import cairo
import sys
import os

import unicodedata
from fringwalker import *
from fringrenderer import FringRenderer
from fringutil import *
from fringdata import SumListCollection

CURSOR_NONE = 0
CURSOR_BUSY = 1
CURSOR_LINK = 2

ui = """
<ui>

    <menubar name="MenuBar">
        <menu action="FRing">
            <menuitem action="SelectFolder"/>
            <menuitem action="OpenParent"/>
            <menuitem action="Refresh"/>
            <separator />
            <menuitem action="Save Image..."/>
            <separator />
            <menuitem action="Quit"/>
        </menu>
        <menu action="View">
            <menuitem action="Show Hidden Files"/>
            <separator />
            <menuitem action="Zoom In"/>
            <menuitem action="Zoom Out"/>
            <separator />
            <menuitem action="AddRing"/>
            <menuitem action="RemRing"/>
        </menu>
        <menu action="Help">
            <menuitem action="About"/>
        </menu>
    </menubar>
    
    <toolbar name="Toolbar">
    </toolbar>
    
</ui>"""

class UI( gtk.Window ):

    def __init__(self, uri):
        self.busy_cursor = 0
        self.backgroundColour = (1,1,1)
        self.data = None
        self.zoomfactor = 1.0
        self.renderer = FringRenderer()
        self.collection = SumListCollection()
        self.walker = FringWalker(self.collection);
        self.scan_active = False
        self.cursor = None
        self.maxrings = 4

        # create gui
        gtk.Window.__init__(self)
        self.set_title("fring");
        self.__init_gui()

        # walk directory
        self.walker.connect("list-changed",self.__event_walker_progress)
        self.walker.connect("finished", self.__event_walker_finished)
        self.walker.connect("manually-stopped", lambda w: self.__show_busy_cursor(-1))
        self.open_folder(uri)

    def __init_gui(self):

        # create menubar
        uimanager = gtk.UIManager()
        accelgroup = uimanager.get_accel_group()
        self.add_accel_group(accelgroup)
        ag_global = gtk.ActionGroup('ag_global')
        ag_global.add_actions([
            ('FRing', None, _("_Folder")),
            ('View', None, _("_View")),
            ('Help', None, _("_Help")),
            ('OpenParent', gtk.STOCK_GO_UP, _("Open _Parent"), "<alt>Up", _("Open the parent folder"), self.open_parent),
            ('SelectFolder', gtk.STOCK_OPEN, _("_Open Folder..."), None, _("Open Folder..."), self.dialog_openfolder),
            ('Quit', gtk.STOCK_QUIT, _("_Quit"), None, _("Quit"), self.close),
            
            ('Zoom In', gtk.STOCK_ZOOM_IN, _("Zoom _In"), "<ctrl>Up", _("Zoom In"), lambda w: self.zoom(w,0.2)),
            ('Zoom Out', gtk.STOCK_ZOOM_OUT, _("Zoom _Out"), "<ctrl>Down", _("Zoom Out"), lambda w: self.zoom(w,-0.2)),
            
            ('AddRing', gtk.STOCK_ADD, _("_Add Ring"), "<ctrl>plus", _("Add Ring"), lambda w: self.zoom_rings(1)),
            ('RemRing', gtk.STOCK_REMOVE, _("_Remove Ring"), "<ctrl>minus", _("Remove Ring"), lambda w: self.zoom_rings(-1)),

            ('Save Image...', gtk.STOCK_SAVE_AS, _("_Save Image..."), None, _("Save Image..."), self.save_image),
            ('Refresh', gtk.STOCK_REFRESH, _("_Refresh Tree"), "<ctrl>R", _("Refresh Tree"), self.refresh_tree),
            ('About', gtk.STOCK_ABOUT, _("_About"), None, "About", self.dialog_about),
        ])
        action = gtk.ToggleAction("Show Hidden Files", _("Show Hidden Files"), None, None)
        action.set_active(True)
        action.connect("toggled",self.__event_togglehidden)
        ag_global.add_action(action)
        uimanager.insert_action_group(ag_global, 0)
        uimanager.add_ui_from_string(ui)
        menubar = uimanager.get_widget('/MenuBar')
        menubar.show()

        # create toolbar
        toolbar = gtk.HBox()

        b = gtk.Button()
        img = gtk.image_new_from_stock(gtk.STOCK_GO_UP,  gtk.ICON_SIZE_BUTTON)
        b.set_property("image", img)
        uimanager.get_action("/MenuBar/FRing/OpenParent").connect_proxy(b)
        toolbar.pack_start( b, False )
        b.connect("enter-notify-event",self.__event_parentbutton_enter)
        b.connect("leave-notify-event",self.__event_parentbutton_leave)

        b = gtk.FileChooserButton('Select a Folder')
        b.set_action(gtk.FILE_CHOOSER_ACTION_SELECT_FOLDER)
        b.set_local_only(False)
        h = b.connect("current-folder-changed", lambda w: self.__set_uri(w.get_uri()))
        toolbar.pack_start( b, True )
        self.filechooserbutton = b
        self.filechooserbutton.handler_folderchanged = h

        # create canvas
        self.eventbox = gtk.EventBox()
        self.image = gtk.Image()
        self.eventbox.add(self.image)
        self.eventbox.add_events( gtk.gdk.EXPOSURE_MASK
                                | gtk.gdk.LEAVE_NOTIFY_MASK
                                | gtk.gdk.BUTTON_PRESS_MASK
                                | gtk.gdk.POINTER_MOTION_MASK )
        self.eventbox.connect("scroll_event", self.__event_scroll)
        self.eventbox.connect("button-press-event",self.__event_click)
        self.eventbox.connect("motion-notify-event",self.__event_move)

        # Create label
        self.label = gtk.Label()
        self.label.set_alignment(0, .5)
        self.label.set_padding(6, 0)
        self.label.set_text("")

        # aligh menubar, toolbar and canvas vertically
        vbox = gtk.VBox();
        vbox.pack_start(menubar,False,False)
        vbox.pack_start(toolbar,False,False)
        f = gtk.Frame()
        f.set_shadow_type(gtk.SHADOW_IN)
        f.add(self.eventbox)
        vbox.pack_start(f)
        vbox.pack_start(self.label,False,False,6)
        self.add(vbox)

        # show everything
        # Note: With set_default_size, the image can't be downsized.
        self.set_size_request(100,100) # minimum size, needed!
        self.resize(500,350)
        self.show_all()
        self.__create_canvas()
        self.eventbox.connect("size-allocate",self.__event_resized)
        self.connect("delete_event", self.close)

    def dialog_about(self,widget):
        d = gtk.AboutDialog()
        d.set_name("fring");
        d.set_license(LICENSE);
        c = unicodedata.lookup('COPYRIGHT SIGN')
        e = unicodedata.lookup('LATIN SMALL LETTER E WITH ACUTE')
        d.set_copyright(u"Copyright "+c+" 2006 Lennart Poettering, Fr"+e+"d"+e+"ric Back")
        d.set_comments(_("Visual disk usage analyser"))
        d.run()
        d.destroy()

    def dialog_openfolder(self,widget):
        """ Open a dialog to select a folder """
        d = gtk.FileChooserDialog(None, self,
            gtk.FILE_CHOOSER_ACTION_SELECT_FOLDER,
            (gtk.STOCK_CANCEL,0,gtk.STOCK_OK,1))
        if d.run() == 1: self.open_folder(d.get_uri())
        d.destroy()


    def open_folder(self,uri):
        # change folder by changing the chooser button
        self.filechooserbutton.set_current_folder_uri(uri)

    def close(self,w=None,e=None):
        self.walker.stop()
        self.destroy()
        gtk.main_quit()

    def open_parent(self,widget):
        self.open_folder(get_parent_from_uri(self.uri))

    def zoom(self,widget,factor):
        self.zoomfactor += factor
        if self.zoomfactor < 0:
            self.zoomfactor = 0
        self.redraw()

    def zoom_rings(self,mod):
        r = self.maxrings
        r += mod
        if r < 2: r = 2
        if r != self.maxrings:
            self.maxrings = r
            #print "rings",self.maxrings
            self.redraw()

    def redraw(self,widget=None):
        # clear the canvas
        self.__show_busy_cursor(1)
        self.ctx.rectangle(0,0,self.width,self.height)
        self.ctx.set_source_rgb(*self.backgroundColour)
        self.ctx.fill()   

        # draw segments
        if not self.data: return
        self.renderer.WIDTH = self.width
        self.renderer.HEIGHT = self.height
        self.renderer.INNER_RADIUS = self.height/12
        self.renderer.RING_RADIUS = self.height/10
        self.renderer.RING_RADIUS *= self.zoomfactor
        self.renderer.RINGS_MAX = self.maxrings
        self.renderer.draw_segment(self.ctx, 0, 0, 1, 0, 1, self.data, self.uri)
        self.image.queue_draw()
        self.__show_busy_cursor(-1)

    def save_image(self, widget=None):
        d = gtk.FileChooserDialog("Save As...",
            self.get_toplevel(), gtk.FILE_CHOOSER_ACTION_SAVE,
            (gtk.STOCK_CANCEL,0,gtk.STOCK_OK,1), None)
        d.set_current_name( self.data.name.replace(" ","_") + ".png" )
        r = d.run()
        if r == 1:
            #print d.get_uri()
            self.__show_busy_cursor(1)
            pixbuf = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB,True,8,self.width,self.height)
            pixmap, mask = self.image.get_pixmap()
            pixbuf.get_from_drawable(pixmap,pixmap.get_colormap(),0,0,0,0,-1,-1)
            #pixbuf.save(d.get_filename(), "jpeg", {"quality":"100"})
            pixbuf.save(d.get_filename(), "png", {})
            self.__show_busy_cursor(-1)
        d.destroy()

    def refresh_tree(self,widget):
        """ Refresh the current folder """
        self.walker.stop()
        self.collection.clear()
        self.walker.walk(self.uri)
        self.scan_active = True
        self.__show_busy_cursor(1)

    #----------------------------------------------------------- private methods

    def __set_uri(self,uri):
        print "requested:",uri,
        d = self.collection.get_sumlist(uri)
        if d is not None:
            print "(load from collection)"
            self.data = self.collection.get_sumlist(uri)
            self.uri = uri
            self.redraw()
        else:
            print "(walk)"
            self.uri = uri
            self.walker.stop()
            if uri:
                self.walker.walk(uri)
                self.scan_active = True
                self.__show_busy_cursor(1)

    def __create_canvas(self):
        """ Create a new pixmap and a new cairo context """
        r = self.eventbox.get_allocation()
        self.width, self.height = r.width, r.height
        self.pixmap = gtk.gdk.Pixmap(self.window,r.width,r.height)
        self.image.set_from_pixmap(self.pixmap,None)
        self.ctx = self.pixmap.cairo_create()
        self.renderer.prepare_layouts(self.ctx)
        self.ctx.rectangle(0,0,self.width,self.height)
        self.ctx.set_source_rgb(*self.backgroundColour)
        self.ctx.fill() 

    def __show_busy_cursor(self, value=0):
        self.busy_cursor += value
        if self.busy_cursor > 0: self.__set_cursor(CURSOR_BUSY)
        else: self.__set_cursor(CURSOR_NONE)

    def __set_cursor(self, cursor):
        if self.window is None: return
        if self.cursor == cursor: return

        if cursor == CURSOR_NONE:
            self.window.set_cursor(None)
        elif cursor == CURSOR_BUSY:
            self.window.set_cursor(gtk.gdk.Cursor(gtk.gdk.WATCH))
        elif cursor == CURSOR_LINK:
            self.window.set_cursor(gtk.gdk.Cursor(gtk.gdk.HAND1))

    #--------------------------------------------------- gobject event callbacks

    def __event_togglehidden(self,widget):
        if self.walker.showhidden == widget.get_active(): return
        self.walker.showhidden = widget.get_active()
        self.refresh_tree()

    def __event_move(self, widget, event):    
        f = self.renderer.get_hotspot_at(event.x, event.y)
        self.label.set_text("")
        if f:
            
            markup = "%s, %s, %0.1f%%" % (format_uri(f.path), pretty_size(f.sumlist.size), f.value*100)
            self.label.set_text(markup)
        
            if f.sumlist.has_children():
                self.__set_cursor(CURSOR_LINK)
                return

        self.__show_busy_cursor() # reset busy cursor

    def __event_click(self, widget, event):
        f = self.renderer.get_hotspot_at(event.x, event.y)
        if f and f.sumlist.children:

            self.open_folder(f.path)

            #if self.scan_active:
                # if we are still walking the tree, FORCE a new scan on the path
                # because we CANNOT guarantee that the path we point at is ready.
            #    self.open_folder(f.path)

            #else:
                # if we are sure that the sumlist is complete, jump there directly
                
                # block filechooser callbacks while changing it
            #    self.filechooserbutton.handler_block(self.filechooserbutton.handler_folderchanged)
            #    self.uri = f.path
            #    self.__event_walker_progress(None,f.sumlist)
            #    self.filechooserbutton.set_current_folder_uri(f.path)
            #    self.filechooserbutton.handler_unblock(self.filechooserbutton.handler_folderchanged)

    def __event_scroll(self, widget, event):
        if event.direction is gtk.gdk.SCROLL_UP:
            self.zoom(widget, 0.2)
        elif event.direction is gtk.gdk.SCROLL_DOWN:
            self.zoom(widget, -0.2)

    def __event_walker_finished(self, widget, data):
        self.__event_walker_progress(widget, data)
        self.__show_busy_cursor(-1)
        self.scan_active = False

    def __event_resized(self, widget, event):
        r = self.eventbox.get_allocation()
        if (r.width,r.height) != (self.width,self.height):
            self.__create_canvas()
            self.redraw()

    def __event_parentbutton_enter(self,widget,event):
        markup = "%s" %format_uri(get_parent_from_uri(self.uri))
        self.label.set_text(markup)

    def __event_parentbutton_leave(self,widget,event):
        self.label.set_text("")

    def __event_walker_progress(self,widget,data):
        self.data = data
        self.redraw()