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


try:
    from dataclasses import make_dataclass
except ImportError:
    make_dataclass = None


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)

    @unittest.skipIf(not make_dataclass, "No dataclass support")
    def test_encode_dataclass_item(self):
        TestDataClass = make_dataclass(
            "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"}'
        )