#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Extra widgets and fields
"""

from django import forms
from django.utils.safestring import mark_safe
from django.utils.translation import ugettext_lazy as _

from chimere import settings
from django.contrib.gis.db import models

URL_OSM_JS = ["http://www.openlayers.org/api/OpenLayers.js",
          "http://openstreetmap.org/openlayers/OpenStreetMap.js"]

def getMapJS():
    '''Variable initialization for drawing the map
    '''
    # projection, center and bounds definitions
    js = u"epsg_display_projection = new OpenLayers.Projection('EPSG:%d');\n" %\
                                                settings.EPSG_DISPLAY_PROJECTION
    js += u"epsg_projection = new OpenLayers.Projection('EPSG:%d');\n" % \
                                                        settings.EPSG_PROJECTION
    js += u"var centerLonLat = new OpenLayers.LonLat(%f,\
%f).transform(epsg_display_projection, epsg_projection);\n" % \
                                                         settings.DEFAULT_CENTER
    js += u"var maxExtent = new OpenLayers.Bounds(%f, %f, %f, %f);\n" % \
                                                             settings.MAP_BOUNDS
    js += u"var media_path = '%s';\n" % settings.MEDIA_URL
    js = u"""<script type="text/javascript"><!--
%s// !--></script>
""" % js
    return js

class PointChooserWidget(forms.TextInput):
    """
    Manage the edition of point on a map
    """
    class Media:
        css = {
            "all": ("%sforms.css" % settings.MEDIA_URL,)
        }
        js = ["%sedit_map.js" % settings.MEDIA_URL] + URL_OSM_JS

    def render(self, name, value, attrs=None):
        '''
        Render a map and latitude, longitude information field
        '''
        val = '0'
        value_x, value_y = 0, 0
        if value:
            val = str(value)
            if hasattr(value, 'x') and hasattr(value, 'y'):
                value_x, value_y = value.x, value.y
            elif isinstance(value, unicode) and value.startswith('POINT('):
                try:
                    value_x, value_y = value.split('(')[1][:-1].split(' ')
                    value_x, value_y = float(value_x), float(value_y)
                except:
                    value = None
            else:
                value = None
        tpl = getMapJS()
        tpl += u'<script src="%sedit_map.js"></script>\n' % settings.MEDIA_URL
        tpl += u"""<div id='map_edit'></div>
<div id='live_lonlat'>
<p><label for='live_latitude'>%s</label>\
<input type='texte' name='live_latitude' id='live_latitude' size='8' \
disabled='true' value='%f'/></p>
<p><label for='live_longitude'>%s</label><input type='texte' \
name='live_longitude' id='live_longitude' size='8' disabled='true' \
value='%f'/></p>
</div>
<input type='hidden' name='%s' id='id_%s' value="%s"/>
""" % (_("Latitude"), value_y, _("Longitude"), value_x, name, name, val)
        tpl += """<script type='text/javascript'><!--
init();
"""
        if value:
            tpl += '''var mylonlat = new OpenLayers.LonLat(%f,%f);
putMarker(mylonlat.transform(epsg_display_projection,
                             map.getProjectionObject()).clone());
''' % (value_x, value_y)
        tpl += """// --></script>
<hr class='spacer'/>
"""
        return mark_safe(tpl)

class PointField(models.PointField):
    '''
    Set the widget for the form field
    '''
    def formfield(self, **keys):
        defaults = {'widget': PointChooserWidget}
        keys.update(defaults)
        return super(PointField, self).formfield(**keys)