import ckanclient
import couchdb
from ckanclient import CkanApiError
import re
import html2text # aaronsw :(
import ckanapi # https://github.com/open-data/ckanapi
 
 
class LoaderError(Exception):
    pass
 
# Instantiate the CKAN client.
#ckan = ckanclient.CkanClient(base_location='http://localhost:5000/api',    api_key='b47b24cd-591d-40c1-8677-d73101d56d1b')
api_key = 'b3ab75e4-afbb-465b-a09d-8171c8c69a7a'
ckan = ckanclient.CkanClient(base_location='http://data.disclosurelo.gs/api',
                             api_key=api_key)
ckandirect = ckanapi.RemoteCKAN('http://data.disclosurelo.gs', api_key=api_key)
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'))
 
 
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__":
    orgs_list = []
    orgs_ids = {}
    for doc in docsdb.view('app/datasets'):
        print "   ---   "
        print doc.id
 
        if doc.value['url'] != "http://data.gov.au/data/" and doc.value['agencyID'] != "qld":
 
 
            # Collect the package metadata.
            pkg_name = filter(lambda x: x in '0123456789abcdefghijklmnopqrstuvwxyz-_',
                              doc.value['url'].replace("http://data.gov.au/dataset/", '').replace('/', '')[:100]);
            print pkg_name
            #add to or create organization using direct API
            org_name = name_munge(doc.value['metadata']["Agency"][:100])
            if org_name not in orgs_list:
                orgs_list = ckandirect.action.organization_list()['result']
                #print orgs_list
                if org_name not in orgs_list:
                    try:
                        print "org not found, creating " + org_name
                        ckandirect.action.organization_create(name=org_name, title=doc.value['metadata']["Agency"],
                                                              description=doc.value['metadata']["Agency"])
                        orgs_list.append(org_name)
                    except ckanapi.ValidationError, e:
                        print e
                        raise LoaderError('Unexpected status')
                else:
                    print "org found, adding dataset to " + org_name
 
            # cache org names -> id mapping
            if org_name not in orgs_ids:
                org = ckandirect.action.organization_show(id=org_name)
                orgs_ids[org_name] = org["result"]["id"]
            org_id = orgs_ids[org_name]
            print "org id is "+org_id
            tags = []
            if doc.value['agencyID'] == "AGIMO":
                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"]]
 
                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']),
                    'owner_org': org_id
                    #todo add missing key values like jurasdiction
                }
            if doc.value['agencyID'] == "qld":
                package_entity = doc.value['metadata']
 
            try:
                #print package_entity
                ckan.package_register_post(package_entity)
            except CkanApiError, e:
                if ckan.last_message == "{\"name\": [\"That URL is already in use.\"]}":
                    print "package already exists"
                else:
                    print ckan.last_message
                    raise LoaderError('Unexpected status %s checking for package under \'%s\': %r' % (
                        ckan.last_status, pkg_name, e.args))
            pkg = ckan.package_entity_get(pkg_name)
 
            # add dataset to group(s)
            groups = []
            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__'):
                    groups = groups + doc.value['metadata']['data.gov.au Category']
                else:
                    groups = groups + [doc.value['metadata']['data.gov.au Category']]
 
            for group_name in groups:
                group_url = name_munge(group_name[:100])
                try:
                    # Update the group details
                    group_entity = ckan.group_entity_get(group_url)
                    print "group "+group_name+" 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 "+group_name+" does not exist, creating"
                        group_entity = {
                            'name': group_url,
                            'title': group_name,
                            'description': group_name,
                            'packages': [pkg_name]
                        }
                        #print group_entity
                        ckan.group_register_post(group_entity)
                    elif ckan.last_status == 409:
                        print "group already exists"
                    else:
                        raise LoaderError('Unexpected status %s adding to group under \'%s\': %r' % (
                            ckan.last_status, pkg_name, e.args))
 
            # add resources (downloadable data files)
            if 'Download' in doc.value['metadata'].keys():
                try:
 
                    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))