"""
Plugin support for rdf.

There are a number of plugin points for rdf: parser, serializer,
store, query processor, and query result. Plugins can be registered
either through setuptools entry_points or by calling
rdf.plugin.register directly.

If you have a package that uses a setuptools based setup.py you can add the
following to your setup::

    entry_points = {
        'rdf.plugins.parser': [
            'nt =     rdf.plugins.parsers.ntriples:NTParser',
            ],
        'rdf.plugins.serializer': [
            'nt =     rdf.plugins.serializers.NTSerializer:NTSerializer',
            ],
        }

See the `setuptools dynamic discovery of services and plugins`__ for more
information.

.. __: http://peak.telecommunity.com/DevCenter/setuptools#dynamic-discovery-of-services-and-plugins

"""

import sys
from typing import (
    TYPE_CHECKING,
    Any,
    Dict,
    Generic,
    Iterator,
    Optional,
    Tuple,
    Type,
    TypeVar,
    overload,
)

from rdflib.exceptions import Error
from rdflib.parser import Parser
from rdflib.query import (
    Processor,
    Result,
    ResultParser,
    ResultSerializer,
    UpdateProcessor,
)
from rdflib.serializer import Serializer
from rdflib.store import Store

if sys.version_info < (3, 8):
    from importlib_metadata import EntryPoint, entry_points
else:
    from importlib.metadata import EntryPoint, entry_points

__all__ = ["register", "get", "plugins", "PluginException", "Plugin", "PKGPlugin"]

rdflib_entry_points = {
    "rdf.plugins.store": Store,
    "rdf.plugins.serializer": Serializer,
    "rdf.plugins.parser": Parser,
    "rdf.plugins.resultparser": ResultParser,
    "rdf.plugins.resultserializer": ResultSerializer,
    "rdf.plugins.queryprocessor": Processor,
    "rdf.plugins.queryresult": Result,
    "rdf.plugins.updateprocessor": UpdateProcessor,
}

_plugins: Dict[Tuple[str, Type[Any]], "Plugin"] = {}


class PluginException(Error):
    pass


PluginT = TypeVar("PluginT")


class Plugin(Generic[PluginT]):
    def __init__(
        self, name: str, kind: Type[PluginT], module_path: str, class_name: str
    ):
        self.name = name
        self.kind = kind
        self.module_path = module_path
        self.class_name = class_name
        self._class: Optional[Type[PluginT]] = None

    def getClass(self) -> Type[PluginT]:
        if self._class is None:
            module = __import__(self.module_path, globals(), locals(), [""])
            self._class = getattr(module, self.class_name)
        return self._class


class PKGPlugin(Plugin[PluginT]):
    def __init__(self, name: str, kind: Type[PluginT], ep: "EntryPoint"):
        self.name = name
        self.kind = kind
        self.ep = ep
        self._class: Optional[Type[PluginT]] = None

    def getClass(self) -> Type[PluginT]:
        if self._class is None:
            self._class = self.ep.load()
        return self._class


def register(name: str, kind: Type[Any], module_path, class_name):
    """
    Register the plugin for (name, kind). The module_path and
    class_name should be the path to a plugin class.
    """
    p = Plugin(name, kind, module_path, class_name)
    _plugins[(name, kind)] = p


def get(name: str, kind: Type[PluginT]) -> Type[PluginT]:
    """
    Return the class for the specified (name, kind). Raises a
    PluginException if unable to do so.
    """
    try:
        p: Plugin[PluginT] = _plugins[(name, kind)]
    except KeyError:
        raise PluginException("No plugin registered for (%s, %s)" % (name, kind))
    return p.getClass()


all_entry_points = entry_points()
if hasattr(all_entry_points, "select"):
    for entry_point, kind in rdflib_entry_points.items():
        for ep in all_entry_points.select(group=entry_point):
            _plugins[(ep.name, kind)] = PKGPlugin(ep.name, kind, ep)
else:
    # Prior to Python 3.10, this returns a dict instead of the selection interface, which is slightly slower
    if TYPE_CHECKING:
        assert isinstance(all_entry_points, dict)
    for entry_point, kind in rdflib_entry_points.items():
        for ep in all_entry_points.get(entry_point, []):
            _plugins[(ep.name, kind)] = PKGPlugin(ep.name, kind, ep)


@overload
def plugins(
    name: Optional[str] = ..., kind: Type[PluginT] = ...
) -> Iterator[Plugin[PluginT]]:
    ...


@overload
def plugins(name: Optional[str] = ..., kind: None = ...) -> Iterator[Plugin]:
    ...


def plugins(
    name: Optional[str] = None, kind: Optional[Type[PluginT]] = None
) -> Iterator[Plugin]:
    """
    A generator of the plugins.

    Pass in name and kind to filter... else leave None to match all.
    """
    for p in _plugins.values():
        if (name is None or name == p.name) and (kind is None or kind == p.kind):
            yield p


# Register Stores
register(
    "default",
    Store,
    "rdflib.plugins.stores.memory",
    "Memory",
)
register(
    "Memory",
    Store,
    "rdflib.plugins.stores.memory",
    "Memory",
)
register(
    "SimpleMemory",
    Store,
    "rdflib.plugins.stores.memory",
    "SimpleMemory",
)
register(
    "Auditable",
    Store,
    "rdflib.plugins.stores.auditable",
    "AuditableStore",
)
register(
    "Concurrent",
    Store,
    "rdflib.plugins.stores.concurrent",
    "ConcurrentStore",
)
register(
    "BerkeleyDB",
    Store,
    "rdflib.plugins.stores.berkeleydb",
    "BerkeleyDB",
)
register(
    "SPARQLStore",
    Store,
    "rdflib.plugins.stores.sparqlstore",
    "SPARQLStore",
)
register(
    "SPARQLUpdateStore",
    Store,
    "rdflib.plugins.stores.sparqlstore",
    "SPARQLUpdateStore",
)

# Register Triple Serializers
register(
    "application/rdf+xml",
    Serializer,
    "rdflib.plugins.serializers.rdfxml",
    "XMLSerializer",
)
register(
    "xml",
    Serializer,
    "rdflib.plugins.serializers.rdfxml",
    "XMLSerializer",
)
register(
    "pretty-xml",
    Serializer,
    "rdflib.plugins.serializers.rdfxml",
    "PrettyXMLSerializer",
)
register(
    "text/n3",
    Serializer,
    "rdflib.plugins.serializers.n3",
    "N3Serializer",
)
register(
    "n3",
    Serializer,
    "rdflib.plugins.serializers.n3",
    "N3Serializer",
)
register(
    "text/turtle",
    Serializer,
    "rdflib.plugins.serializers.turtle",
    "TurtleSerializer",
)
register(
    "turtle",
    Serializer,
    "rdflib.plugins.serializers.turtle",
    "TurtleSerializer",
)
register(
    "ttl",
    Serializer,
    "rdflib.plugins.serializers.turtle",
    "TurtleSerializer",
)
register(
    "longturtle",
    Serializer,
    "rdflib.plugins.serializers.longturtle",
    "LongTurtleSerializer",
)
register(
    "application/n-triples",
    Serializer,
    "rdflib.plugins.serializers.nt",
    "NTSerializer",
)
register(
    "ntriples",
    Serializer,
    "rdflib.plugins.serializers.nt",
    "NTSerializer",
)
register(
    "nt",
    Serializer,
    "rdflib.plugins.serializers.nt",
    "NTSerializer",
)
register(
    "nt11",
    Serializer,
    "rdflib.plugins.serializers.nt",
    "NT11Serializer",
)
register(
    "json-ld",
    Serializer,
    "rdflib.plugins.serializers.jsonld",
    "JsonLDSerializer",
)
register(
    "application/ld+json",
    Serializer,
    "rdflib.plugins.serializers.jsonld",
    "JsonLDSerializer",
)

# Register Quad Serializers
register(
    "application/n-quads",
    Serializer,
    "rdflib.plugins.serializers.nquads",
    "NQuadsSerializer",
)
register(
    "nquads",
    Serializer,
    "rdflib.plugins.serializers.nquads",
    "NQuadsSerializer",
)
register(
    "application/trix",
    Serializer,
    "rdflib.plugins.serializers.trix",
    "TriXSerializer",
)
register(
    "trix",
    Serializer,
    "rdflib.plugins.serializers.trix",
    "TriXSerializer",
)
register(
    "application/trig",
    Serializer,
    "rdflib.plugins.serializers.trig",
    "TrigSerializer",
)
register(
    "trig",
    Serializer,
    "rdflib.plugins.serializers.trig",
    "TrigSerializer",
)
register(
    "hext",
    Serializer,
    "rdflib.plugins.serializers.hext",
    "HextuplesSerializer",
)

# Register Triple Parsers
register(
    "application/rdf+xml",
    Parser,
    "rdflib.plugins.parsers.rdfxml",
    "RDFXMLParser",
)
register(
    "xml",
    Parser,
    "rdflib.plugins.parsers.rdfxml",
    "RDFXMLParser",
)
register(
    "text/n3",
    Parser,
    "rdflib.plugins.parsers.notation3",
    "N3Parser",
)
register(
    "n3",
    Parser,
    "rdflib.plugins.parsers.notation3",
    "N3Parser",
)
register(
    "text/turtle",
    Parser,
    "rdflib.plugins.parsers.notation3",
    "TurtleParser",
)
register(
    "turtle",
    Parser,
    "rdflib.plugins.parsers.notation3",
    "TurtleParser",
)
register(
    "ttl",
    Parser,
    "rdflib.plugins.parsers.notation3",
    "TurtleParser",
)
register(
    "application/n-triples",
    Parser,
    "rdflib.plugins.parsers.ntriples",
    "NTParser",
)
register(
    "ntriples",
    Parser,
    "rdflib.plugins.parsers.ntriples",
    "NTParser",
)
register(
    "nt",
    Parser,
    "rdflib.plugins.parsers.ntriples",
    "NTParser",
)
register(
    "nt11",
    Parser,
    "rdflib.plugins.parsers.ntriples",
    "NTParser",
)
register(
    "application/ld+json",
    Parser,
    "rdflib.plugins.parsers.jsonld",
    "JsonLDParser",
)
register(
    "json-ld",
    Parser,
    "rdflib.plugins.parsers.jsonld",
    "JsonLDParser",
)

# Register Quad Parsers
register(
    "application/n-quads",
    Parser,
    "rdflib.plugins.parsers.nquads",
    "NQuadsParser",
)
register(
    "nquads",
    Parser,
    "rdflib.plugins.parsers.nquads",
    "NQuadsParser",
)
register(
    "application/trix",
    Parser,
    "rdflib.plugins.parsers.trix",
    "TriXParser",
)
register(
    "trix",
    Parser,
    "rdflib.plugins.parsers.trix",
    "TriXParser",
)
register(
    "application/trig",
    Parser,
    "rdflib.plugins.parsers.trig",
    "TrigParser",
)
register(
    "trig",
    Parser,
    "rdflib.plugins.parsers.trig",
    "TrigParser",
)
register(
    "hext",
    Parser,
    "rdflib.plugins.parsers.hext",
    "HextuplesParser",
)

# Register SPARQL Processors
register(
    "sparql",
    Result,
    "rdflib.plugins.sparql.processor",
    "SPARQLResult",
)
register(
    "sparql",
    Processor,
    "rdflib.plugins.sparql.processor",
    "SPARQLProcessor",
)
register(
    "sparql",
    UpdateProcessor,
    "rdflib.plugins.sparql.processor",
    "SPARQLUpdateProcessor",
)

# Register SPARQL Result Serializers
register(
    "xml",
    ResultSerializer,
    "rdflib.plugins.sparql.results.xmlresults",
    "XMLResultSerializer",
)
register(
    "application/sparql-results+xml",
    ResultSerializer,
    "rdflib.plugins.sparql.results.xmlresults",
    "XMLResultSerializer",
)
register(
    "txt",
    ResultSerializer,
    "rdflib.plugins.sparql.results.txtresults",
    "TXTResultSerializer",
)
register(
    "json",
    ResultSerializer,
    "rdflib.plugins.sparql.results.jsonresults",
    "JSONResultSerializer",
)
register(
    "application/sparql-results+json",
    ResultSerializer,
    "rdflib.plugins.sparql.results.jsonresults",
    "JSONResultSerializer",
)
register(
    "csv",
    ResultSerializer,
    "rdflib.plugins.sparql.results.csvresults",
    "CSVResultSerializer",
)
register(
    "text/csv",
    ResultSerializer,
    "rdflib.plugins.sparql.results.csvresults",
    "CSVResultSerializer",
)

# Register SPARQL Result Parsers
register(
    "xml",
    ResultParser,
    "rdflib.plugins.sparql.results.xmlresults",
    "XMLResultParser",
)
register(
    "application/sparql-results+xml",
    ResultParser,
    "rdflib.plugins.sparql.results.xmlresults",
    "XMLResultParser",
)
register(
    "application/sparql-results+xml; charset=UTF-8",
    ResultParser,
    "rdflib.plugins.sparql.results.xmlresults",
    "XMLResultParser",
)
register(
    "application/rdf+xml",
    ResultParser,
    "rdflib.plugins.sparql.results.graph",
    "GraphResultParser",
)
register(
    "json",
    ResultParser,
    "rdflib.plugins.sparql.results.jsonresults",
    "JSONResultParser",
)
register(
    "application/sparql-results+json",
    ResultParser,
    "rdflib.plugins.sparql.results.jsonresults",
    "JSONResultParser",
)
register(
    "csv",
    ResultParser,
    "rdflib.plugins.sparql.results.csvresults",
    "CSVResultParser",
)
register(
    "text/csv",
    ResultParser,
    "rdflib.plugins.sparql.results.csvresults",
    "CSVResultParser",
)
register(
    "tsv",
    ResultParser,
    "rdflib.plugins.sparql.results.tsvresults",
    "TSVResultParser",
)
register(
    "text/tab-separated-values",
    ResultParser,
    "rdflib.plugins.sparql.results.tsvresults",
    "TSVResultParser",
)
