import re
from lxml import etree
from lxml.etree import XMLSyntaxError
from pylons.i18n import _

from ckan import model

import ckan.plugins as p
import ckan.lib.helpers as h, json
from ckan.lib.base import BaseController, c, \
                          response, render, abort, redirect

from ckanext.harvest.plugin import DATASET_TYPE_NAME

import logging
log = logging.getLogger(__name__)

class ViewController(BaseController):

    not_auth_message = p.toolkit._('Not authorized to see this page')

    def __before__(self, action, **params):

        super(ViewController,self).__before__(action, **params)

        c.dataset_type = DATASET_TYPE_NAME

    def delete(self,id):
        try:
            context = {'model':model, 'user':c.user}
            p.toolkit.get_action('harvest_source_delete')(context, {'id':id})

            h.flash_success(_('Harvesting source successfully inactivated'))

            redirect(h.url_for('{0}_admin'.format(DATASET_TYPE_NAME), id=id))
        except p.toolkit.ObjectNotFound:
            abort(404,_('Harvest source not found'))
        except p.toolkit.NotAuthorized:
            abort(401,self.not_auth_message)


    def refresh(self, id):
        try:
            context = {'model':model, 'user':c.user, 'session':model.Session}
            p.toolkit.get_action('harvest_job_create')(context,{'source_id':id})
            h.flash_success(_('Refresh requested, harvesting will take place within 15 minutes.'))
        except p.toolkit.ObjectNotFound:
            abort(404,_('Harvest source not found'))
        except p.toolkit.NotAuthorized:
            abort(401,self.not_auth_message)
        except Exception, e:
            if 'Can not create jobs on inactive sources' in str(e):
                h.flash_error(_('Cannot create new harvest jobs on inactive sources.'
                                 + ' First, please change the source status to \'active\'.'))
            elif 'There already is an unrun job for this source' in str(e):
                h.flash_notice(_('A harvest job has already been scheduled for this source'))
            else:
                msg = 'An error occurred: [%s]' % str(e)
                h.flash_error(msg)

        redirect(h.url_for('{0}_admin'.format(DATASET_TYPE_NAME), id=id))

    def show_object(self,id):

        try:
            context = {'model':model, 'user':c.user}
            obj = p.toolkit.get_action('harvest_object_show')(context, {'id':id})

            # Check content type. It will probably be either XML or JSON
            try:

                if obj['content']:
                    content = obj['content']
                elif 'original_document' in obj['extras']:
                    content = obj['extras']['original_document']
                else:
                    abort(404,_('No content found'))

                etree.fromstring(re.sub('<\?xml(.*)\?>','',content))
                response.content_type = 'application/xml; charset=utf-8'
                if not '<?xml' in content.split('\n')[0]:
                    content = u'<?xml version="1.0" encoding="UTF-8"?>\n' + content

            except XMLSyntaxError:
                try:
                    json.loads(obj['content'])
                    response.content_type = 'application/json; charset=utf-8'
                except ValueError:
                    # Just return whatever it is
                    pass

            response.headers['Content-Length'] = len(content)
            return content.encode('utf-8')
        except p.toolkit.ObjectNotFound:
            abort(404,_('Harvest object not found'))
        except p.toolkit.NotAuthorized:
            abort(401,self.not_auth_message)
        except Exception, e:
            msg = 'An error occurred: [%s]' % str(e)
            abort(500,msg)


    def _get_source_for_job(self, source_id):

        try:
            context = {'model': model, 'user': c.user}
            source_dict = p.toolkit.get_action('harvest_source_show')(context,
                    {'id': source_id})
        except p.toolkit.ObjectNotFound:
            abort(404, p.toolkit._('Harvest source not found'))
        except p.toolkit.NotAuthorized:
            abort(401,self.not_auth_message)
        except Exception, e:
            msg = 'An error occurred: [%s]' % str(e)
            abort(500,msg)

        return source_dict

    def show_job(self, id, source_dict=False, is_last=False):

        try:
            context = {'model':model, 'user':c.user}
            c.job = p.toolkit.get_action('harvest_job_show')(context, {'id': id})
            c.job_report = p.toolkit.get_action('harvest_job_report')(context, {'id': id})

            if not source_dict:
                source_dict = p.toolkit.get_action('harvest_source_show')(context, {'id': c.job['source_id']})

            c.harvest_source = source_dict
            c.is_last_job = is_last

            return render('source/job/read.html')

        except p.toolkit.ObjectNotFound:
            abort(404,_('Harvest job not found'))
        except p.toolkit.NotAuthorized:
            abort(401,self.not_auth_message)
        except Exception, e:
            msg = 'An error occurred: [%s]' % str(e)
            abort(500,msg)

    def about(self, id):
        try:
            context = {'model':model, 'user':c.user}
            c.harvest_source = p.toolkit.get_action('harvest_source_show')(context, {'id':id})
            return render('source/about.html')
        except p.toolkit.ObjectNotFound:
            abort(404,_('Harvest source not found'))
        except p.toolkit.NotAuthorized:
            abort(401,self.not_auth_message)

    def admin(self, id):
        try:
            context = {'model':model, 'user':c.user}
            p.toolkit.check_access('harvest_source_update', context, {'id': id})
            c.harvest_source = p.toolkit.get_action('harvest_source_show')(context, {'id':id})
            return render('source/admin.html')
        except p.toolkit.ObjectNotFound:
            abort(404,_('Harvest source not found'))
        except p.toolkit.NotAuthorized:
            abort(401,self.not_auth_message)

    def show_last_job(self, source):

        source_dict = self._get_source_for_job(source)

        if not source_dict['status']['last_job']:
            abort(404, _('No jobs yet for this source'))

        return self.show_job(source_dict['status']['last_job']['id'],
                             source_dict=source_dict,
                             is_last=True)


    def list_jobs(self, source):

        try:
            context = {'model':model, 'user':c.user}
            c.harvest_source =  p.toolkit.get_action('harvest_source_show')(context, {'id': source})
            c.jobs = p.toolkit.get_action('harvest_job_list')(context, {'source_id': c.harvest_source['id']})

            return render('source/job/list.html')

        except p.toolkit.ObjectNotFound:
            abort(404,_('Harvest source not found'))
        except p.toolkit.NotAuthorized, e:
            abort(401,self.not_auth_message)
        except Exception, e:
            msg = 'An error occurred: [%s]' % str(e)
            abort(500,msg)