import dataclasses
import datetime
import json
import unittest
from decimal import Decimal

import attr
from twisted.internet import defer

from scrapy.http import Request, Response
from scrapy.utils.serialize import ScrapyJSONEncoder


class JsonEncoderTestCase(unittest.TestCase):
    def setUp(self):
        self.encoder = ScrapyJSONEncoder(sort_keys=True)

    def test_encode_decode(self):
        dt = datetime.datetime(2010, 1, 2, 10, 11, 12)
        dts = "2010-01-02 10:11:12"
        d = datetime.date(2010, 1, 2)
        ds = "2010-01-02"
        t = datetime.time(10, 11, 12)
        ts = "10:11:12"
        dec = Decimal("1000.12")
        decs = "1000.12"
        s = {"foo"}
        ss = ["foo"]
        dt_set = {dt}
        dt_sets = [dts]

        for input, output in [
            ("foo", "foo"),
            (d, ds),
            (t, ts),
            (dt, dts),
            (dec, decs),
            (["foo", d], ["foo", ds]),
            (s, ss),
            (dt_set, dt_sets),
        ]:
            self.assertEqual(
                self.encoder.encode(input), json.dumps(output, sort_keys=True)
            )

    def test_encode_deferred(self):
        self.assertIn("Deferred", self.encoder.encode(defer.Deferred()))

    def test_encode_request(self):
        r = Request("http://www.example.com/lala")
        rs = self.encoder.encode(r)
        self.assertIn(r.method, rs)
        self.assertIn(r.url, rs)

    def test_encode_response(self):
        r = Response("http://www.example.com/lala")
        rs = self.encoder.encode(r)
        self.assertIn(r.url, rs)
        self.assertIn(str(r.status), rs)

    def test_encode_dataclass_item(self) -> None:
        @dataclasses.dataclass
        class TestDataClass:
            name: str
            url: str
            price: int

        item = TestDataClass(name="Product", url="http://product.org", price=1)
        encoded = self.encoder.encode(item)
        self.assertEqual(
            encoded, '{"name": "Product", "price": 1, "url": "http://product.org"}'
        )

    def test_encode_attrs_item(self):
        @attr.s
        class AttrsItem:
            name = attr.ib(type=str)
            url = attr.ib(type=str)
            price = attr.ib(type=int)

        item = AttrsItem(name="Product", url="http://product.org", price=1)
        encoded = self.encoder.encode(item)
        self.assertEqual(
            encoded, '{"name": "Product", "price": 1, "url": "http://product.org"}'
        )