from typing import Optional

CAPACITOR = "http://purl.org/ee/part-type#capacitor"
RESISTOR = "http://purl.org/ee/part-type#resistor"
DIODE = "http://purl.org/ee/part-type#diode"
INDUCTOR = "http://purl.org/ee/part-type#inductor"
CRYSTAL = "http://purl.org/ee/part-type#inductor"

DIGIKEY_URI = "https://digikey.com"

_DIGIKEY_FACT_KEY_PREFIX = "http://purl.org/trygvis/ee/digikey-fact-key#"


def make_digikey_fact_key(key: int) -> str:
    return _DIGIKEY_FACT_KEY_PREFIX + str(key)


def is_digikey_fact_key(uri: str) -> bool:
    return uri.startswith(_DIGIKEY_FACT_KEY_PREFIX)


def parse_digikey_fact_key(uri: str) -> Optional[int]:
    if uri.startswith(_DIGIKEY_FACT_KEY_PREFIX):
        try:
            return int(uri[len(_DIGIKEY_FACT_KEY_PREFIX):])
        except ValueError:
            pass


_FACT_KEY_PREFIX = "http://purl.org/trygvis/ee/fact-key#"


def make_fact_key(name: str) -> str:
    return "{}{}".format(_FACT_KEY_PREFIX, name)