import ckanclient
import couchdb
from ckanclient import CkanApiError
import re
import html2text # aaronsw :(
 
 
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='482a9dd2-a976-4adf-ac77-d71d92a98a52')
#couch = couchdb.Server('http://127.0.0.1:5984/')
couch = couchdb.Server('http://192.168.1.113:5984/')
 
# 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 = doc.value['url'].replace("http://data.gov.au/dataset/",'').replace('/','');                                                                  _
            tags = []
            if len(doc.value['metadata']["Keywords / Tags"]) > 0:
                if hasattr(doc.value['metadata']["Keywords / Tags"], '__iter__'):
                    tags = tags + doc.value['metadata']["Keywords / Tags"]
                else:
                    tags = tags + [doc.value['metadata']["Keywords / Tags"]]
            if 'data.gov.au Category' in doc.value['metadata'].keys() and len(doc.value['metadata']['data.gov.au Category']) > 0:
                if hasattr(doc.value['metadata']['data.gov.au Category'], '__iter__'):
                    tags = tags + doc.value['metadata']['data.gov.au Category']
                else:
                    tags = tags + [doc.value['metadata']['data.gov.au Category']]
            tags = [re.sub('[^a-zA-Z0-9-_.]', '', tag.replace('&', 'and')).lower() for tag in tags if tag]
            print tags
            package_entity = {
                'name': pkg_name,
                'title': doc.value['metadata']['DCTERMS.Title'],
                'url': doc.value['metadata']['DCTERMS.Source.URI'],
                'tags': tags, #tags are mandatory?
                'author': doc.value['metadata']["DCTERMS.Creator"],
                'maintainer': doc.value['metadata']["DCTERMS.Creator"],
                'licence_id': get_licence_id(doc.value['metadata']['DCTERMS.License']),
                'notes': html2text.html2text(doc.value['metadata']['Description']),
            }
 
            try:
                print package_entity
                ckan.package_register_post(package_entity)
            except CkanApiError, e:
                if ckan.last_status == 409:
                    print "package already exists"
                else:
                    raise LoaderError('Unexpected status %s checking for package under \'%s\': %r' % (
                        ckan.last_status, pkg_name, e.args))
 
 
            #add to group
 
            group_name = name_munge(doc.value['metadata']["Agency"][:100])
            try:
                print ckan.group_entity_get(group_name)
 
                # Update the group details
                group_entity = ckan.last_message
                print "group exists"
                if 'packages' in group_entity.keys():
                    group_entity['packages'] = list(set(group_entity['packages'] + [pkg_name]))
                else:
                    group_entity['packages'] = [pkg_name]
                ckan.group_entity_put(group_entity)
            except CkanApiError, e:
                if ckan.last_status == 404:
                    print "group does not exist, creating"
                    group_entity = {
                        'name': group_name,
                        'title': doc.value['metadata']["Agency"],
                        'description': doc.value['metadata']["Agency"],
                        'packages': [pkg_name],
                        # 'type': "organization" # not allowed via API, use database query
                        # update "group" set type = 'organization';
                        }
                    print group_entity
                    ckan.group_register_post(group_entity)
                else:
                    raise LoaderError('Unexpected status %s adding to group under \'%s\': %r' % (
                        ckan.last_status, pkg_name, e.args))
            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']:
 
                            # 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']
                            print resource
                            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))