"""
YAML Schema to RDF Generator

Generate a JSON LD representation of the model

"""
import os
import urllib.parse as urlparse
from typing import Union, TextIO, Optional

import click
from rdflib import Graph
from rdflib.plugin import plugins as rdflib_plugins, Parser as rdflib_Parser

from linkml import METAMODEL_CONTEXT_URI
from linkml.generators.jsonldgen import JSONLDGenerator
from linkml_runtime.linkml_model.meta import SchemaDefinition
from linkml.utils.generator import Generator, shared_arguments


class RDFGenerator(Generator):
    generatorname = os.path.basename(__file__)
    generatorversion = "0.1.1"
    # TODO: we leave ttl as default for backwards compatibility but nt is recommended, see https://github.com/linkml/linkml/issues/163
    valid_formats =['ttl'] + sorted([x.name for x in rdflib_plugins(None, rdflib_Parser) if '/' not in str(x.name)])
    visit_all_class_slots = False

    def __init__(self, schema: Union[str, TextIO, SchemaDefinition], **kwargs) -> None:
        super().__init__(schema, **kwargs)

    def _data(self, g: Graph) -> str:
        return g.serialize(format='turtle' if self.format == 'ttl' else self.format).decode()

    def end_schema(self, output: Optional[str] = None, context: str = None, **_) -> None:
        gen = JSONLDGenerator(self, fmt=JSONLDGenerator.valid_formats[0], metadata=self.emit_metadata,
                              importmap=self.importmap)
        # Iterate over permissible text strings making them URI compatible
        for e in gen.schema.enums.values():
            for pv in e.permissible_values.values():
                pv.text = urlparse.quote(pv.text)
        jsonld_str = gen.serialize(context=context)

        graph = Graph()
        graph.parse(data=jsonld_str, format="json-ld", base=str(self.namespaces._base), prefix=True)
        if output:
            with open(output, 'w') as outf:
                outf.write(self._data(graph))
        else:
            print(self._data(graph))


@shared_arguments(RDFGenerator)
@click.command()
@click.option("-o", "--output", help="Output file name")
@click.option("--context", default=[METAMODEL_CONTEXT_URI], multiple=True,
              help=f"JSONLD context file (default: {METAMODEL_CONTEXT_URI})")
def cli(yamlfile, **kwargs):
    """ Generate an RDF representation of a LinkML model """
    print(RDFGenerator(yamlfile, **kwargs).serialize(**kwargs))


if __name__ == '__main__':
    cli()
