#!/usr/bin/python
from __future__ import division,nested_scopes

import sys
sys.path.append("../../editor/pour")
sys.path.append("../light8")

from Submaster import Submaster
from skim.zooming import Zooming,Pair
from math import sqrt,sin,cos
from pygame.rect import Rect
from xmlnodebase import xmlnodeclass,collectiveelement,xmldocfile
from dispatch import dispatcher

import dmxclient

import Tkinter as tk

defaultfont="arial 8"

def pairdist(pair1,pair2):
    return pair1.dist(pair2)

def canvashighlighter(canvas,obj,attribute,normalval,highlightval):
    """creates bindings on a canvas obj that make attribute go
    from normal to highlight when the mouse is over the obj"""
    canvas.tag_bind(obj,"<Enter>",
                    lambda ev: canvas.itemconfig(obj,**{attribute:highlightval}))
    canvas.tag_bind(obj,"<Leave>",
                    lambda ev: canvas.itemconfig(obj,**{attribute:normalval}))

class Field(xmlnodeclass):
    
    """one light has a field of influence. for any point on the
    canvas, you can ask this field how strong it is. """

    def name(self,newval=None):
        """light/sub name"""
        return self._getorsetattr("name",newval)
    def center(self,x=None,y=None):
        """x,y float coords for the center of this light in the field. returns
        a Pair, although it accepts x,y"""
        return Pair(self._getorsettypedattr("x",float,x),
                    self._getorsettypedattr("y",float,y))

    def falloff(self,dist=None):
        
        """linear falloff from 1 at center, to 0 at dist pixels away
        from center"""
        return self._getorsettypedattr("falloff",float,dist)

    def getdistforintensity(self,intens):
        """returns the distance you'd have to be for the given intensity (0..1)"""
        return (1-intens)*self.falloff()

    def calc(self,x,y):
        """returns field strength at point x,y"""
        dist=pairdist(Pair(x,y),self.center())
        return max(0,(self.falloff()-dist)/self.falloff())

class Fieldset(collectiveelement):
    """group of fields. persistent."""
    def childtype(self): return Field

    def version(self):
        """read-only version attribute on fieldset tag"""
        return self._getorsetattr("version",None)

    def report(self,x,y):
        """reports active fields and their intensities"""
        active=0
        for f in self.getall():
            name=f.name()
            intens=f.calc(x,y)
            if intens>0:
                print name,intens,
                active+=1
        if active>0:
            print
        self.dmxsend(x,y)
    def dmxsend(self,x,y):
        """output lights to dmx"""
        levels=dict([(f.name(),f.calc(x,y)) for f in self.getall()])
        dmxlist=Submaster(None,levels).get_dmx_list()
        dmxclient.outputlevels(dmxlist)
        
        
    def getbounds(self):
        """returns xmin,xmax,ymin,ymax for the non-zero areas of this field"""
        r=None
        for f in self.getall():
            rad=f.getdistforintensity(0)
            fx,fy=f.center()
            fieldrect=Rect(fx-rad,fy-rad,rad*2,rad*2)
            if r is None:
                r=fieldrect
            else:
                r=r.union(fieldrect)
        return r.left,r.right,r.top,r.bottom

class Fieldsetfile(xmldocfile):
    def __init__(self,filename):
        self._openornew(filename,topleveltype=Fieldset)
    def fieldset(self):
        return self._gettoplevel()

########################################################################
########################################################################

class FieldDisplay:
    """the view for a Field."""
    def __init__(self,canvas,field):
        self.canvas=canvas
        self.field=field
        self.tags=[str(id(self))] # canvas tag to id our objects
        
    def setcoords(self):
        """adjust canvas obj coords to match the field"""
        # this uses the canvas object ids saved by makeobjs
        f=self.field
        c=self.canvas
        w2c=self.canvas.world2canvas

        # rings
        for intens,ring in self.rings.items():
            rad=f.getdistforintensity(intens)
            p1=w2c(*(f.center()-Pair(rad,rad)))
            p2=w2c(*(f.center()+Pair(rad,rad)))
            c.coords(ring,p1[0],p1[1],p2[0],p2[1])

        # text
        p1=w2c(*f.center())
        c.coords(self.txt,*p1)

    def makeobjs(self):
        """(re)create the canvas objs (null coords) and make their bindings"""
        c=self.canvas
        f=self.field
        c.delete(self.tags)

        w2c=self.canvas.world2canvas

        # make rings
        self.rings={} # rad,canvasobj
        for intens,color in (#(1,'white'),
                             (.8,'gray90'),(.6,'gray80'),(.4,'gray60'),(.2,'gray50'),
                             (0,'#000080')):
            self.rings[intens]=c.create_oval(0,0,0,0,
                                          outline=color,width=2,tags=self.tags,
                                          outlinestipple='gray50')

        # make text
        self.txt=c.create_text(0,0,text=f.name(),font=defaultfont+" bold",
                               fill='white',anchor='c',
                               tags=self.tags)

        # highlight text bindings
        canvashighlighter(c,self.txt,'fill',normalval='white',highlightval='red')

        # position drag bindings
        def press(ev):
            self._lastmouse=ev.x,ev.y
        def motion(ev):
            dcan=Pair(*[a-b for a,b in zip((ev.x,ev.y),self._lastmouse)])
            dworld=c.canvas2world_vector(*dcan)
            self.field.center(*(self.field.center()+dworld))
            self._lastmouse=ev.x,ev.y
            self.setcoords() # redraw
        def release(ev):
            if hasattr(self,'_lastmouse'):
                del self._lastmouse
            dispatcher.send("field coord changed") # updates bounds
            
        c.tag_bind(self.txt,"<ButtonPress-1>",press)
        c.tag_bind(self.txt,"<B1-Motion>",motion)
        c.tag_bind(self.txt,"<B1-ButtonRelease>",release)

        # radius drag bindings
        outerring=self.rings[0]
        canvashighlighter(c,outerring,
                          'outline',normalval='#000080',highlightval='#4040ff')
        def motion(ev):
            worldmouse=self.canvas.canvas2world(ev.x,ev.y)
            currentdist=pairdist(worldmouse,self.field.center())
            self.field.falloff(currentdist)
            self.setcoords()
        c.tag_bind(outerring,"<B1-Motion>",motion)
        c.tag_bind(outerring,"<B1-ButtonRelease>",release) # from above

        self.setcoords()
    
class Tracker(tk.Frame):

    """whole tracker widget, which is mostly a view for a
    Fieldset. tracker makes its own fieldset"""

    # world coords of the visible canvas (preserved even in window resizes)
    xmin=0
    xmax=100
    ymin=0
    ymax=100

    fieldsetfile=None
    displays=None # Field : FieldDisplay. we keep these in sync with the fieldset
    
    def __init__(self,master):
        tk.Frame.__init__(self,master)

        self.displays={}
        
        c=self.canvas=Zooming(self,bg='black',closeenough=5)
        c.pack(fill='both',exp=1)

        # preserve edge coords over window resize
        c.bind("<Configure>",self.configcoords)
        
        c.bind("<Motion>",
               lambda ev: self._fieldset().report(*c.canvas2world(ev.x,ev.y)))
        def save(ev):
            print "saving"
            self.fieldsetfile.save()
        master.bind("<Key-s>",save)
        dispatcher.connect(self.autobounds,"field coord changed")

    def _fieldset(self):
        return self.fieldsetfile.fieldset()

    def load(self,filename):
        self.fieldsetfile=Fieldsetfile(filename)
        self.displays.clear()
        for f in self.fieldsetfile.fieldset().getall():
            self.displays[f]=FieldDisplay(self.canvas,f)
            self.displays[f].makeobjs()
        self.autobounds()

    def configcoords(self,*args):
        # force our canvas coords to stay at the edges of the window
        c=self.canvas
        cornerx,cornery=c.canvas2world(0,0)
        c.move(cornerx-self.xmin,
               cornery-self.ymin)
        c.setscale(0,0,
                   c.winfo_width()/(self.xmax-self.xmin),
                   c.winfo_height()/(self.ymax-self.ymin))

    def autobounds(self):
        """figure out our bounds from the fieldset, and adjust the display zooms.
        writes the corner coords onto the canvas."""
        self.xmin,self.xmax,self.ymin,self.ymax=self._fieldset().getbounds()

        self.configcoords()
        
        c=self.canvas
        c.delete('cornercoords')
        for x,anc2 in ((self.xmin,'w'),(self.xmax,'e')):
            for y,anc1 in ((self.ymin,'n'),(self.ymax,'s')):
                pos=c.world2canvas(x,y)
                c.create_text(pos[0],pos[1],text="%s,%s"%(x,y),
                              fill='white',anchor=anc1+anc2,
                              tags='cornercoords')
        [d.setcoords() for d in self.displays.values()]

########################################################################
########################################################################
                
root=tk.Tk()
root.wm_geometry('700x350')
tra=Tracker(root)
tra.pack(fill='both',exp=1)

tra.load("fieldsets/demo")

root.mainloop()