import datagraph.schemeld
import urllib.parse
import wikidata.entity
import datetime
import logging

REFERENCE_PROPERTIES = {'P813', 'P854', 'P248', 'P143', 'P813'}

def fmt_value(c, prefer_reference = False):
    if isinstance(c, str):
        return '"{}"'.format(c) # TODO: Escape
    elif isinstance(c, datagraph.schemeld.Concept):
        if '@id' in c:
            return fmt_value(c['@id'], prefer_reference)
        else:
            logging.error('Could not determine useful id for %s', c)
            return ''
    elif isinstance(c, wikidata.entity.Entity):
        s = c.id
        if isinstance(s, int):
            s = 'P{}'.format(s)
        if s in REFERENCE_PROPERTIES:
            s = s.replace('P', 'S', 1)
        return s
    elif isinstance(c, urllib.parse.ParseResult):
        return c.geturl() if prefer_reference else fmt_value(c.geturl(), prefer_reference)
    elif isinstance(c, datetime.datetime):
        return '+{}/11'.format(c.isoformat())
    elif isinstance(c, datetime.date):
        return '+{}T00:00:00Z/11'.format(c.isoformat())

    return str(c)

def fmt_predicate(pred, object):
    if isinstance(pred, urllib.parse.ParseResult) and pred.netloc == 'schema.org':
        lang = object.get('__language') or 'en'
        if pred.path == '/name':
            return 'L'+lang
        elif pred.path == '/alternateName':
            return 'A'+lang
        elif pred.path == '/description':
            return 'D'+lang
        elif pred.path == '/sameAs':
            return 'S{}wiki'.format(lang)
        else:
            assert False, pred
    return fmt_value(pred, prefer_reference = True)

def assert_good_value_repr(r):
    assert '{' not in r
    assert '}' not in r

def to_quickstatements_v1_item(subject, lines, skip_impossible = True, skip_already_syncronized = True):
    #assert '@id' not in subject, 'TODO: Linked subjects'
    subject_id = fmt_value(subject, True) if '@id' in subject else 'LAST'
    assert_good_value_repr(subject_id)

    if subject_id == 'LAST':
        lines.append(['CREATE'])

    def fmt_key_value_pair(v, line):
        if isinstance(v, list):
            for e in v:
                fmt_key_value_pair(e, line)
            return
        elif isinstance(v, dict) and 'value' in v:
            line.append(fmt_value(v['value']))
            for sub_k, sub_v in v.items():
                if sub_k is None or sub_v is None:
                    continue
                if not isinstance(sub_k, str):
                    line.append(fmt_predicate(sub_k, sub_v))
                    line.append(fmt_value(sub_v))
        else:
            line.append(fmt_value(v))

    for predicate, pred_objects in subject.data.items():
        if isinstance(predicate, str) and (predicate == '@id' or predicate.startswith('__')):
            continue

        assert isinstance(pred_objects, list)
        for pred_object in pred_objects:
            if pred_object.get('__synchronized_with_wikidata', False) and skip_already_syncronized:
                continue
            predicate_str = fmt_predicate(predicate, pred_object)
            line = [subject_id, predicate_str]
            fmt_key_value_pair(pred_object, line)

            if skip_impossible and predicate_str.startswith('"'):
                logging.warning('Bad line: %s (Lines must not start with ")', predicate_str)
                continue
            if '' in line and skip_impossible:
                logging.warning('Bad line: %s (Lines must not contain empty names)', line)
                continue
            assert 'None' not in line, line
            lines.append(line)

def to_quickstatements_v1(concepts):
    if isinstance(concepts, datagraph.schemeld.Concept):
        concepts = [concepts]

    lines = []

    for concept in concepts:
        to_quickstatements_v1_item(concept, lines)

    logging.info("Produced %s statements for %s concepts", len(lines), len(concepts))
    commands = '\n'.join(['\t'.join(l) for l in lines])

    assert '\tNone\t' not in commands, 'TODO'
    return commands

def commands_to_quickstatements_v1_url(commands):
    url = commands.replace('\t', '|').replace('\n', '||')
    url = urllib.parse.quote(url, safe = '')
    return 'https://quickstatements.toolforge.org/#/v1=' + url

def to_quickstatements_v1_url(concepts):
    return commands_to_quickstatements_v1_url(to_quickstatements_v1(concepts))