from pathlib import Path
from typing import List

from ee.digikey import Digikey, DigikeyParser, DigikeyClient, SearchResponseTypes, DigikeyProduct, DigikeyStore
from ee.part import PartDb, load_db, save_db, Part
from ee.xml import types
from ee.xml.uris import make_digikey_fact_key

__all__ = ["search_parts"]


def resolved(supplier, p: DigikeyProduct) -> Part:
    # TODO: fix uri
    xml = types.Part(uri="https://digikey.com/pn#{}".format(p.part_number),
                     supplier=supplier,
                     description=p.description,
                     distributor_info=types.DistributorInfo(state="resolved"),
                     links=types.LinkList(),
                     facts=types.FactList(),
                     references=types.ReferencesList())
    part = Part(xml)

    if p.url:
        part.get_links().append(types.Link(url=p.url, relation="canonical", media_type="text/html"))

    for d in p.documents:
        title = "{}: {}".format(d.kind, d.title)
        part.get_links().append(types.Link(url=d.url, relation="http://purl.org/ee/link-relation#documentation",
                                           media_type="text/html", title=title))

    part.add_spn(p.part_number)

    if p.mpn:
        part.add_mpn(p.mpn)

    facts: List[types.Fact] = xml.factsProp.factProp
    for a in p.attributes:
        key = make_digikey_fact_key(a.attribute_type.id)
        facts.append(types.Fact(key=key, label=a.attribute_type.label, value=a.value))

    if len(p.price_breaks):
        xml.price_breaksProp = types.PriceBreakList()

        price_breaks: List[types.PriceBreak] = xml.price_breaksProp.price_break
        for pb in p.price_breaks:
            amount = types.Amount(value=str(pb.per_piece_price.amount), currency=pb.per_piece_price.currency)
            price_breaks.append(types.PriceBreak(pb.quantity, amount=amount))

    return part


def search_parts(in_path: Path, out_path: Path, cache_dir: Path, store_code):
    in_db = load_db(in_path)
    out_parts = PartDb()

    store = DigikeyStore.from_store_code(store_code)

    parser = DigikeyParser(Digikey())
    client = DigikeyClient(store.products_url, cache_dir)

    for xml in in_db.iterparts():
        if xml.supplierProp is not None and xml.supplierProp != store.url:
            continue

        part = Part(xml)

        dpn = part.get_only_spn()
        mpn = part.get_only_mpn()

        is_mpn = query = None

        if dpn is not None:
            query = dpn.valueProp
            is_mpn = False
        elif mpn is not None:
            query = mpn.valueProp
            is_mpn = True

        if query is None:
            # TODO: use schematic reference
            print("could not find pn or dpn: part.uri={}".format(xml.uriProp))
            continue

        out_id = query
        out_part = types.Part(uri=out_id,
                              distributor_info=types.DistributorInfo(),
                              supplier=store.url,
                              references=xml.referencesProp)
        di = out_part.distributor_infoProp

        text = client.search(query)
        response = parser.parse_string(text)

        if response.response_type == SearchResponseTypes.SINGLE:
            out_part = resolved(store.url, response.products[0])
        elif response.response_type == SearchResponseTypes.MANY:

            # find those with an exact match. Digikey uses a prefix search so a query for "FOO" will return "FOO"
            # and "FOOT".
            def get_field(p):
                return p.mpn if is_mpn else p.part_number

            filtered_products = [p for p in response.products if get_field(p) == query]

            if len(filtered_products) == 0:
                di.stateProp = "not-found"
            else:
                dpn = sorted(filtered_products, key=lambda p: p.part_number)[0].part_number

                response = parser.parse_string(client.search(dpn))
                if response.response_type == SearchResponseTypes.SINGLE:
                    out_part = resolved(store.url, response.products[0])
                else:
                    di.stateProp = "many"

        elif response.response_type == SearchResponseTypes.TOO_MANY:
            di.stateProp = "too-many"
        elif response.response_type == SearchResponseTypes.NO_MATCHES:
            di.stateProp = "not-found"

        out_parts.add_entry(out_part, True)

    print("Saving {} work parts".format(out_parts.size()))
    save_db(out_path, out_parts, sort=True)