"""
doab_utils.py

"""
import logging
import re
from ssl import SSLError
from urllib.parse import urljoin

import requests

from oaipmh.metadata import MetadataReader

from django.conf import settings



logger = logging.getLogger(__name__)


doab_reader = MetadataReader(
    fields={
        'title': ('textList', 'oai_dc:dc/datacite:title/text()'),
        'creator': ('textList', 'oai_dc:dc/datacite:creator/text()'),
        'subject': ('textList', 'oai_dc:dc/datacite:subject/text()'),
        'description': ('textList', 'oai_dc:dc/dc:description/text()'),
        'publisher': ('textList', 'oai_dc:dc/dc:publisher/text()'),
        'editor': ('textList', 'oai_dc:dc/datacite:contributor[@type="Editor"]/text()'),
        'date': ('textList', 'oai_dc:dc/datacite:date[@type="Issued"]/text()'),
        'timestamp': ('textList', 'oai_dc:dc/dc:date/text()'),
        'type': ('textList', 'oai_dc:dc/oaire:resourceType/text()'),
        'format': ('textList', 'oai_dc:dc/dc:format/text()'),
        'identifier': ('textList', 'oai_dc:dc/dc:identifier/text()'),
        'source': ('textList', 'oai_dc:dc/dc:source/text()'),
        'language': ('textList', 'oai_dc:dc/dc:language/text()'),
        'relation': ('textList', 'oai_dc:dc/dc:relation/text()'),
        'coverage': ('textList', 'oai_dc:dc/dc:coverage/text()'),
        'rights': ('textList', 'oai_dc:dc/oaire:licenseCondition/@uri'),
        'isbn': ('textList', 'oai_dc:dc/datacite:alternateIdentifier[@type="ISBN"]/text()'),
        'doi': ('textList', 'oai_dc:dc/datacite:alternateIdentifier[@type="DOI"]/text()'),
    },
    namespaces={
        'oai_dc': 'http://www.openarchives.org/OAI/2.0/oai_dc/',
        'dc' : 'http://purl.org/dc/elements/1.1/',
        'grantor': 'http://purl.org/dc/elements/1.1/',
        'publisher': 'http://purl.org/dc/elements/1.1/',
        'oapen': 'http://purl.org/dc/elements/1.1/',
        'oaire': 'https://raw.githubusercontent.com/rcic/openaire4/master/schemas/4.0/oaire.xsd',
        'datacite': 'https://schema.datacite.org/meta/kernel-4.1/metadata.xsd',
        'doc': 'http://www.lyncode.com/xoai'
    }
)




STREAM_QUERY = 'https://directory.doabooks.org/rest/search?query=handle:{}&expand=bitstreams'

def get_streamdata(handle):
    url = STREAM_QUERY.format(handle)
    try:
        response = requests.get(url, headers={"User-Agent": settings.USER_AGENT})
        items = response.json()
        if items:
            for stream in items[0]['bitstreams']:
                if stream['bundleName'] == "THUMBNAIL":
                    stream['handle'] = handle
                    return stream
        else:
            logger.error("No items in streamdata for %s", handle)
    except requests.exceptions.RequestException as e:
        logger.error(e)
    except SSLError as e:
        logger.error(e)
    except ValueError as e:
        # decoder error
        logger.error(e)

COVER_FSTRING = "https://directory.doabooks.org/bitstream/handle/{handle}/{name}?sequence={sequenceId}&isAllowed=y"
def doab_cover(doab_id):
    stream_data = get_streamdata(doab_id)
    if not stream_data:
        logger.error('get_streamdata failed for %s', doab_id)
        return None
    return COVER_FSTRING.format(**stream_data)