import os
import re
from logging import getLogger
from pylons import config
from pylons.i18n import _
from genshi.input import HTML
from genshi.filters import Transformer

import ckan.lib.helpers as h

from ckan.lib.search import SearchError
from ckan.lib.helpers import json

from ckan import model

from ckan.plugins import implements, SingletonPlugin
from ckan.plugins import IRoutes
from ckan.plugins import IConfigurable, IConfigurer
from ckan.plugins import IGenshiStreamFilter
from ckan.plugins import IPackageController

from ckan.logic import ValidationError

import html

from ckanext.spatial.lib import save_package_extent,validate_bbox, bbox_query
from ckanext.spatial.model import setup as setup_model


log = getLogger(__name__)

def package_error_summary(error_dict):
    ''' Do some i18n stuff on the error_dict keys '''

    def prettify(field_name):
        field_name = re.sub('(?<!\w)[Uu]rl(?!\w)', 'URL',
                            field_name.replace('_', ' ').capitalize())
        return _(field_name.replace('_', ' '))

    summary = {}
    for key, error in error_dict.iteritems():
        if key == 'resources':
            summary[_('Resources')] = _('Package resource(s) invalid')
        elif key == 'extras':
            summary[_('Extras')] = _('Missing Value')
        elif key == 'extras_validation':
            summary[_('Extras')] = error[0]
        else:
            summary[_(prettify(key))] = error[0]
    return summary

class SpatialMetadata(SingletonPlugin):

    implements(IPackageController, inherit=True)
    implements(IConfigurable, inherit=True)

    def configure(self, config):

        if not config.get('ckan.spatial.testing',False):
            setup_model()


    def create(self, package):
        self.check_spatial_extra(package)

    def edit(self, package):
        self.check_spatial_extra(package)

    def check_spatial_extra(self,package):
        if not package.id:
            log.warning('Couldn\'t store spatial extent because no id was provided for the package')
            return

        # TODO: deleted extra
        for extra in package.extras_list:
            if extra.key == 'spatial':
                if extra.state == 'active':
                    try:
                        log.debug('Received: %r' % extra.value)
                        geometry = json.loads(extra.value)
                    except ValueError,e:
                        error_dict = {'spatial':[u'Error decoding JSON object: %s' % str(e)]}
                        raise ValidationError(error_dict, error_summary=package_error_summary(error_dict))
                    except TypeError,e:
                        error_dict = {'spatial':[u'Error decoding JSON object: %s' % str(e)]}
                        raise ValidationError(error_dict, error_summary=package_error_summary(error_dict))

                    try:
                        save_package_extent(package.id,geometry)

                    except ValueError,e:
                        error_dict = {'spatial':[u'Error creating geometry: %s' % str(e)]}
                        raise ValidationError(error_dict, error_summary=package_error_summary(error_dict))
                    except Exception, e:
                        error_dict = {'spatial':[u'Error: %s' % str(e)]}
                        raise ValidationError(error_dict, error_summary=package_error_summary(error_dict))

                elif extra.state == 'deleted':
                    # Delete extent from table
                    save_package_extent(package.id,None)

                break


    def delete(self, package):
        save_package_extent(package.id,None)

class SpatialQuery(SingletonPlugin):

    implements(IRoutes, inherit=True)
    implements(IPackageController, inherit=True)

    def before_map(self, map):

        map.connect('api_spatial_query', '/api/2/search/{register:dataset|package}/geo',
            controller='ckanext.spatial.controllers.api:ApiController',
            action='spatial_query')
        return map

    def before_search(self,search_params):
        if 'extras' in search_params and 'ext_bbox' in search_params['extras'] \
            and search_params['extras']['ext_bbox']:

            bbox = validate_bbox(search_params['extras']['ext_bbox'])
            if not bbox:
                raise SearchError('Wrong bounding box provided')

            extents = bbox_query(bbox)

            if extents.count() == 0:
                # We don't need to perform the search
                search_params['abort_search'] = True
            else:
                # We'll perform the existing search but also filtering by the ids
                # of datasets within the bbox
                bbox_query_ids = [extent.package_id for extent in extents]

                q = search_params.get('q','')
                new_q = '%s AND ' % q if q else ''
                new_q += '(%s)' % ' OR '.join(['id:%s' % id for id in bbox_query_ids])

                search_params['q'] = new_q

        return search_params

class SpatialQueryWidget(SingletonPlugin):

    implements(IGenshiStreamFilter)

    def filter(self, stream):
        from pylons import request, tmpl_context as c
        routes = request.environ.get('pylons.routes_dict')
        if routes.get('controller') == 'package' and \
            routes.get('action') == 'search':

            data = {
                'bbox': request.params.get('ext_bbox',''),
                'default_extent': config.get('ckan.spatial.default_map_extent','')
            }
            stream = stream | Transformer('body//div[@id="dataset-search-ext"]')\
                .append(HTML(html.SPATIAL_SEARCH_FORM % data))
            stream = stream | Transformer('head')\
                .append(HTML(html.SPATIAL_SEARCH_FORM_EXTRA_HEADER % data))
            stream = stream | Transformer('body')\
                .append(HTML(html.SPATIAL_SEARCH_FORM_EXTRA_FOOTER % data))

        return stream


class DatasetExtentMap(SingletonPlugin):

    implements(IGenshiStreamFilter)
    implements(IConfigurer, inherit=True)

    def filter(self, stream):
        from pylons import request, tmpl_context as c

        route_dict = request.environ.get('pylons.routes_dict')
        route = '%s/%s' % (route_dict.get('controller'), route_dict.get('action'))
        routes_to_filter = config.get('ckan.spatial.dataset_extent_map.routes', 'package/read').split(' ')
        if route in routes_to_filter and c.pkg.id:

            extent = c.pkg.extras.get('spatial',None)
            if extent:
                map_element_id = config.get('ckan.spatial.dataset_extent_map.element_id', 'dataset')
                title = config.get('ckan.spatial.dataset_extent_map.title', 'Geographic extent')
                body_html = html.PACKAGE_MAP_EXTENDED if title else html.PACKAGE_MAP_BASIC
                map_type = config.get('ckan.spatial.dataset_extent_map.map_type', 'osm')
                if map_type == 'osm':
                    js_library_links = '<script type="text/javascript" src="/ckanext/spatial/js/openlayers/OpenLayers_dataset_map.js"></script>'
                    map_attribution = html.MAP_ATTRIBUTION_OSM
                elif map_type == 'os':
                    js_library_links = '<script src="http://osinspiremappingprod.ordnancesurvey.co.uk/libraries/openlayers-openlayers-56e25fc/lib/OpenLayers.js" type="text/javascript"></script>'
                    map_attribution = '' # done in the js instead
                
                data = {'extent': extent,
                        'title': _(title),
                        'map_type': map_type,
                        'js_library_links': js_library_links,
                        'map_attribution': map_attribution,
                        'element_id': map_element_id}
                stream = stream | Transformer('body//div[@id="%s"]' % map_element_id)\
                         .append(HTML(body_html % data))
                stream = stream | Transformer('head')\
                    .append(HTML(html.PACKAGE_MAP_EXTRA_HEADER % data))
                stream = stream | Transformer('body')\
                    .append(HTML(html.PACKAGE_MAP_EXTRA_FOOTER % data))



        return stream

    def update_config(self, config):
        here = os.path.dirname(__file__)

        template_dir = os.path.join(here, 'templates')
        public_dir = os.path.join(here, 'public')

        if config.get('extra_template_paths'):
            config['extra_template_paths'] += ','+template_dir
        else:
            config['extra_template_paths'] = template_dir
        if config.get('extra_public_paths'):
            config['extra_public_paths'] += ','+public_dir
        else:
            config['extra_public_paths'] = public_dir