import ckanclient
import couchdb
from ckanclient import CkanApiError
import re
 
class LoaderError(Exception):
    pass
 
# Instantiate the CKAN client.
#ckan = ckanclient.CkanClient(base_location='http://localhost:5000/api',    api_key='b47b24cd-591d-40c1-8677-d73101d56d1b')
ckan = ckanclient.CkanClient(base_location='http://data.disclosurelo.gs/api',    api_key='72f90359-0396-438c-804f-a26a24336747')
#couch = couchdb.Server('http://127.0.0.1:5984/')
couch = couchdb.Server('http://192.168.1.113:5984/')
 
# http://stackoverflow.com/a/7778368/684978
from HTMLParser import HTMLParser
import htmlentitydefs
 
class HTMLTextExtractor(HTMLParser):
    def __init__(self):
        HTMLParser.__init__(self)
        self.result = [ ]
 
    def handle_data(self, d):
        self.result.append(d)
 
    def handle_charref(self, number):
        codepoint = int(number[1:], 16) if number[0] in (u'x', u'X') else int(number)
        self.result.append(unichr(codepoint))
 
    def handle_entityref(self, name):
        codepoint = htmlentitydefs.name2codepoint[name]
        self.result.append(unichr(codepoint))
 
    def get_text(self):
        return u''.join(self.result)
 
def html_to_text(html):
    s = HTMLTextExtractor()
    s.feed(html)
    return s.get_text()
 
# http://code.activestate.com/recipes/578019-bytes-to-human-human-to-bytes-converter/
SYMBOLS = {
    'customary': ('B', 'KB', 'MB', 'GB', 'T', 'P', 'E', 'Z', 'Y'),
    'customary_ext': ('byte', 'kilo', 'mega', 'giga', 'tera', 'peta', 'exa',
                      'zetta', 'iotta'),
    'iec': ('Bi', 'Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi', 'Yi'),
    'iec_ext': ('byte', 'kibi', 'mebi', 'gibi', 'tebi', 'pebi', 'exbi',
                'zebi', 'yobi'),
}
 
def human2bytes(s):
    """
    Attempts to guess the string format based on default symbols
    set and return the corresponding bytes as an integer.
    When unable to recognize the format ValueError is raised.
 
      >>> human2bytes('0 B')
      0
      >>> human2bytes('1 K')
      1024
      >>> human2bytes('1 M')
      1048576
      >>> human2bytes('1 Gi')
      1073741824
      >>> human2bytes('1 tera')
      1099511627776
 
      >>> human2bytes('0.5kilo')
      512
      >>> human2bytes('0.1  byte')
      0
      >>> human2bytes('1 k')  # k is an alias for K
      1024
      >>> human2bytes('12 foo')
      Traceback (most recent call last):
          ...
      ValueError: can't interpret '12 foo'
    """
    init = s
    num = ""
    while s and s[0:1].isdigit() or s[0:1] == '.':
        num += s[0]
        s = s[1:]
    num = float(num)
    letter = s.strip()
    for name, sset in SYMBOLS.items():
        if letter in sset:
            break
    else:
        if letter == 'k':
            # treat 'k' as an alias for 'K' as per: http://goo.gl/kTQMs
            sset = SYMBOLS['customary']
            letter = letter.upper()
        else:
            raise ValueError("can't interpret %r" % init)
    prefix = {sset[0]: 1}
    for i, s in enumerate(sset[1:]):
        prefix[s] = 1 << (i + 1) * 10
    return int(num * prefix[letter])
 
# https://github.com/okfn/ckanext-importlib
def munge(name):
    # convert spaces to underscores
    name = re.sub(' ', '_', name).lower()
    # convert symbols to dashes
    name = re.sub('[:]', '_-', name).lower()
    name = re.sub('[/]', '-', name).lower()
    # take out not-allowed characters
    name = re.sub('[^a-zA-Z0-9-_]', '', name).lower()
    # remove double underscores
    name = re.sub('__', '_', name).lower()
    return name
 
 
def name_munge(input_name):
    return munge(input_name.replace(' ', '').replace('.', '_').replace('&', 'and'))
    #return input_name.replace(' ', '').replace('.', '_').replace('&', 'and')
 
def get_licence_id(licencename):
    map = {
        "Creative Commons - Attribution-Share Alike 2.0 Australia (CC-SA)\nThe downloadable version of the database is licensed under CC-BY-SA Creative Commons Attribution Share Alike and contains only the database fields that are released under that license. These fields are object title, object number, object description as well as temporal, spatial and dimension details. It also contains a persistent URL for each record.": 'cc-by-sa',
        "CreativeCommonsAttributionNonCommercial30AustraliaCCBYNC30": 'cc-nc',
        'Otherpleasespecify': 'notspecified',
        '': 'notspecified',
        "Publicly available data": 'notspecified',
        "CreativeCommonsAttributionNoDerivativeWorks30AustraliaCCBYND30": "other-closed",
        "CreativeCommonsAttributionNonCommercialNoDerivs30AustraliaCCBYNCND30": "other-closed",
        'CreativeCommonsAttribution30AustraliaCCBY30': 'cc-by',
        "Creative Commons - Attribution 2.5 Australia (CC-BY)": 'cc-by',
        'CreativeCommonsAttributionCCBY25': 'cc-by',
        "PublicDomain": 'other-pd',
        }
    if licencename not in map.keys():
          raise Exception(licencename + " not found");
    return map[licencename];
 
docsdb = couch['disclosr-documents']
 
if __name__ == "__main__":
    for doc in docsdb.view('app/datasets'):
        print doc.id
        if doc.value['url'] != "http://data.gov.au/data/":
            # Collect the package metadata.
            pkg_name = name_munge(doc.value['metadata']['DCTERMS.Title'][:100])
            tags = doc.value['metadata']["Keywords / Tags"]
            if not hasattr(tags, '__iter__'):
                tags = [tags]
            [re.sub('[^a-zA-Z0-9-_()]', '', tag).replace('&', 'and').lower() for tag in tags]
            package_entity = {
                'name': pkg_name,
                'title': doc.value['metadata']['DCTERMS.Title'],
                'url': doc.value['metadata']['DCTERMS.Source.URI'],
 
                'author': doc.value['metadata']["DCTERMS.Creator"],
                'maintainer': doc.value['metadata']["DCTERMS.Creator"],
                'licence_id': get_licence_id(doc.value['metadata']['DCTERMS.License']),
                'notes': html_to_text(doc.value['metadata']['Description']),
            }
            if len(tags) > 0:
                package_entity['tags'] = tags
                print tags
            try:
                #print doc.id
                ckan.package_register_post(package_entity)
            except CkanApiError, e:
                if ckan.last_status == 409:
                    print "already exists"
                else:
                    raise LoaderError('Unexpected status %s checking for package under \'%s\': %r' % (
                        ckan.last_status, pkg_name, e.args))
 
            print package_entity
            #todo add to organisation (author/creator/maintainer) http://docs.ckan.org/en/latest/apiv3.html#examples ckan.logic.action.update.package_owner_org_update
            #if 'data.gov.au Category' in doc.value['metadata'].keys(): #todo add to group
            if 'Download' in doc.value['metadata'].keys():
                try:
                    pkg = ckan.package_entity_get(pkg_name)
                    resources = pkg.get('resources', [])
                    if len(resources) < len(doc.value['metadata']['Download']):
                        for resource in doc.value['metadata']['Download']:
                            print resource
                            # http://docs.ckan.org/en/ckan-1.7/domain-model-resource.html
                            # (KML/KMZ) / (Shapefile) /(Other)
                            format = "plain"
                            if resource['format'] == '(XML)':
                                format = 'xml'
                            if resource['format'] == '(CSV/XLS)':
                                format = 'csv'
                            name = resource['href']
                            if 'name' in resource.keys():
                                name = resource['name']
                            ckan.add_package_resource(pkg_name, resource['href'], name=name, resource_type='data',
                                format=format, size=human2bytes(resource['size'].replace(',', '')))
                    else:
                        print "resources already exist"
                except CkanApiError, e:
                    if ckan.last_status == 404:
                        print "parent dataset does not exist"
                    else:
                        raise LoaderError('Unexpected status %s checking for package under \'%s\': %r' % (
                            ckan.last_status, pkg_name, e.args))