"""Specialised plots for functions defined in blmfuncs.py.

fixme:
        -- If scatterplot is not inited with a colorvector there will be no
        colorbar, but when adding colors the colorbar shoud be created.
"""

from matplotlib import cm
import gtk
import fluents
from fluents import plots
import scipy
from scipy import dot,sum,diag,arange,log,mean,newaxis,sqrt

class BlmScatterPlot(plots.ScatterPlot):
    """Scatter plot used for scores and loadings in bilinear models."""

    def __init__(self, title, model, absi=0, ordi=1, part_name='T', color_by=None):
        if model.model.has_key(part_name)!=True:
            raise ValueError("Model part: %s not found in model" %mod_param)
        self._T = model.model[part_name]
        if self._T.shape[1]==1:
            logger.log('notice', 'Scores have only one component')
            absi= ordi = 0
        self._absi = absi
        self._ordi = ordi
        self._colorbar = None
        self._cmap = cm.jet
        dataset_1 = model.as_dataset(part_name)
        id_dim = dataset_1.get_dim_name(0)
        sel_dim = dataset_1.get_dim_name(1)
        id_1, = dataset_1.get_identifiers(sel_dim, [absi])
        id_2, = dataset_1.get_identifiers(sel_dim, [ordi])

        col = 'b'
        if model.model.has_key(color_by):
            col = model.model[color_by].ravel()
            
        plots.ScatterPlot.__init__(self, dataset_1, dataset_1, id_dim, sel_dim, id_1, id_2 ,c=col ,s=40 , name=title)
        
        self.sc.set_cmap(self._cmap)
        self.add_pc_spin_buttons(self._T.shape[1], absi, ordi)
        self._key_press = self.canvas.mpl_connect(
            'key_press_event', self._on_key_press)


    def _update_color_from_dataset(self, data):
        """Overriding scatter for testing of colormaps.
        """
        is_category = False
        array = data.asarray()
        #only support for 2d-arrays:
        try:
            m, n = array.shape
        except:
            raise ValueError, "No support for more than 2 dimensions."
        # is dataset a vector or matrix?
        if not n==1:
            # we have a category dataset
            if isinstance(data, fluents.dataset.CategoryDataset):
                is_category = True
                map_vec = scipy.dot(array, scipy.diag(scipy.arange(n))).sum(1)
            else:
                map_vec = array.sum(1)
        else:
            map_vec = array.ravel()

        # update facecolors
        self.sc.set_array(map_vec)
        self.sc.set_clim(map_vec.min(), map_vec.max())
        if is_category:
            cmap = cm.Paired
        else:
            cmap = cm.jet

        self.sc.set_cmap(cmap)
        self.sc.update_scalarmappable() #sets facecolors from array
        self.canvas.draw()
        
    def _on_key_press(self, event):
        if event.key=='c':
            self.toggle_colorbar()

    def set_facecolor(self, colors):
        """Set patch facecolors.
        """
        pass

    def set_alphas(self, alphas):
        """Set alpha channel for all patches."""
        pass

    def set_sizes(self, sizes):
        """Set patch sizes."""
        pass

    def toggle_colorbar(self):
        if self._colorbar==None:
            if self.sc._A!=None: # we need colormapping
                # get axes original position
                self._ax_last_pos = self.axes.get_position()
                self._colorbar = self.fig.colorbar(self.sc)
                self._colorbar.draw_all()
                self.canvas.draw()
        else:
            # remove colorbar
            # remove, axes, observers, colorbar instance, and restore viewlims 
            cb, ax = self.sc.colorbar
            self.fig.delaxes(ax)
            self.sc.observers = [obs for obs in self.sc.observers if obs !=self._colorbar]
            self._colorbar = None
            self.sc.colorbar = None
            self.axes.set_position(self._ax_last_pos)
            self.canvas.draw()
    
    def add_pc_spin_buttons(self, amax, absi, ordi):    
        sb_a = gtk.SpinButton(climb_rate=1)
        sb_a.set_range(1, amax)
        sb_a.set_value(absi+1)
        sb_a.set_increments(1, 5)
        sb_a.connect('value_changed', self.set_absicca)
        sb_o = gtk.SpinButton(climb_rate=1)
        sb_o.set_range(1, amax)
        sb_o.set_value(ordi+1)
        sb_o.set_increments(1, 5)
        sb_o.connect('value_changed', self.set_ordinate)
        hbox = gtk.HBox()
        gtk_label_a = gtk.Label("A:")
        gtk_label_o = gtk.Label(" O:")
        toolitem = gtk.ToolItem()                          
        toolitem.set_expand(False)
        toolitem.set_border_width(2)
        toolitem.add(hbox)        
        hbox.pack_start(gtk_label_a)        
        hbox.pack_start(sb_a)
        hbox.pack_start(gtk_label_o)        
        hbox.pack_start(sb_o)
        self._toolbar.insert(toolitem, -1)
        toolitem.set_tooltip(self._toolbar.tooltips, "Set Principal component")
        self._toolbar.show_all() #do i need this?

    def set_absicca(self, sb):
        self._absi = sb.get_value_as_int() - 1
        xy = self._T[:,[self._absi, self._ordi]]
        self.xaxis_data = xy[:,0]
        self.yaxis_data = xy[:,1]
        self.sc._offsets = xy
        self.selection_collection._offsets = xy
        self.canvas.draw_idle()
        pad = abs(self.xaxis_data.min()-self.xaxis_data.max())*0.05
        new_lims = (self.xaxis_data.min()+pad, self.xaxis_data.max()+pad)
        self.axes.set_xlim(new_lims, emit=True)
        self.canvas.draw_idle()
        
    def set_ordinate(self, sb):
        self._ordi = sb.get_value_as_int() - 1
        xy = self._T[:,[self._absi, self._ordi]]
        self.xaxis_data = xy[:,0]
        self.yaxis_data = xy[:,1]
        self.sc._offsets = xy
        self.selection_collection._offsets = xy
        pad = abs(self.yaxis_data.min()-self.yaxis_data.max())*0.05
        new_lims = (self.yaxis_data.min()+pad, self.yaxis_data.max()+pad)
        self.axes.set_ylim(new_lims, emit=True)
        self.canvas.draw_idle()
    
    def show_labels(self, index=None):
        if self._text_labels == None:
            x = self.xaxis_data
            y = self.yaxis_data
            self._text_labels = {}
            for name, n in self.dataset_1[self.current_dim].items():
                txt = self.axes.text(x[n],y[n], name)
                txt.set_visible(False)
                self._text_labels[n] = txt
        if index!=None:
            self.hide_labels()
            for indx,txt in self._text_labels.items():
                if indx in index:
                    txt.set_visible(True)
        self.canvas.draw()
                
    def hide_labels(self):
        for txt in self._text_labels.values():
            txt.set_visible(False)
        self.canvas.draw()


class PcaScorePlot(BlmScatterPlot):
    def __init__(self, model, absi=0, ordi=1):
        title = "Pca scores (%s)" %model._dataset['X'].get_name()
        BlmScatterPlot.__init__(self, title, model, absi, ordi, 'T')


class PcaLoadingPlot(BlmScatterPlot):
    def __init__(self, model, absi=0, ordi=1):
        title = "Pca loadings (%s)" %model._dataset['X'].get_name()
        BlmScatterPlot.__init__(self, title, model, absi, ordi, part_name='P', color_by='p_tsq')
        

class PlsScorePlot(BlmScatterPlot):
    def __init__(self, model, absi=0, ordi=1):
        title = "Pls scores (%s)" %model._dataset['X'].get_name()
        BlmScatterPlot.__init__(self, title, model, absi, ordi, 'T')


class PlsLoadingPlot(BlmScatterPlot):
    def __init__(self, model, absi=0, ordi=1):
        title = "Pca loadings (%s)" %model._dataset['X'].get_name()
        BlmScatterPlot.__init__(self, title, model, absi, ordi, part_name='P', color_by='w_tsq')


class LineViewXc(plots.LineViewPlot):
    """A line view of centered raw data
    """
    def __init__(self, model, name='Profiles'):
        # copy, center, plot
        x = model._dataset['X'].copy()
        x._array = x._array - mean(x._array,0)[newaxis]
        plots.LineViewPlot.__init__(self, x, 1, None, name)


class ParalellCoordinates(plots.Plot):
    """Parallell coordinates for score loads with many comp.
    """
    def __init__(self, model, p='loads'):
        pass


class PlsQvalScatter(plots.ScatterPlot):
    """A vulcano like plot of loads vs qvals
    """
    def __init__(self, model, pc=0):
        if not model.model.has_key('w_tsq'):
            return None
        self._W = model.model['P']
        dataset_1 = model.as_dataset('P')
        dataset_2 = model.as_dataset('w_tsq')
        id_dim = dataset_1.get_dim_name(0) #genes
        sel_dim = dataset_1.get_dim_name(1) #_comp
        sel_dim_2 = dataset_2.get_dim_name(1) #_zero_dim
        id_1, = dataset_1.get_identifiers(sel_dim, [0])
        id_2, = dataset_2.get_identifiers(sel_dim_2, [0])
        if model.model.has_key('w_tsq'):
            col = model.model['w_tsq'].ravel()
            #col = normalise(col)
        else:
            col = 'g'
        plots.ScatterPlot.__init__(self, dataset_1, dataset_2,
                                   id_dim, sel_dim, id_1, id_2,
                                   c=col, s=20, sel_dim_2=sel_dim_2,
                                   name='Load Volcano')


class PredictionErrorPlot(plots.Plot):
    """A boxplot of prediction error vs. comp. number.
    """
    def __init__(self, model, name="Prediction Error"):
        if not model.model.has_key('sep'):
            logger.log('notice', 'Model has no calculations of sep')
            return None
        plots.Plot.__init__(self, name)
        self._frozen = True
        self.current_dim = 'johndoe'
        self.axes = self.fig.add_subplot(111)
        
        # draw
        sep = model.model['sep']
        aopt = model.model['aopt']
        bx_plot_lines = self.axes.boxplot(sqrt(sep))
        aopt_marker = self.axes.axvline(aopt, linewidth=10,
                                      color='r',zorder=0,
                                      alpha=.5)
        
        # add canvas
        self.add(self.canvas)
        self.canvas.show()

    def set_current_selection(self, selection):
        pass
    
    
class InfluencePlot(plots.ScatterPlot):
    """
    """
    pass
        

class RMSEPPlot(plots.BarPlot):
    def __init__(self, model, name="RMSEP"):
        if not model.model.has_key('rmsep'):
            logger.log('notice', 'Model has no calculations of sep')
            return
        dataset = model.as_dataset('rmsep')
        plots.BarPlot.__init__(self, dataset, name=name)


def normalise(x):
    """Scale vector x to [0,1]
    """
    x = x - x.min()
    x = x/x.max()
    return x