from __future__ import annotations

import codecs
from typing import cast
from unittest import mock

import pytest

from scrapy.http import HtmlResponse, TextResponse, XmlResponse
from scrapy.selector import Selector
from scrapy.utils.python import to_unicode
from tests.utils.bases.http_response import TestResponseBase


class TestTextResponse(TestResponseBase):
    response_class = TextResponse

    def _links_response(self) -> TextResponse:
        return cast("TextResponse", super()._links_response())

    def _links_response_no_href(self) -> TextResponse:
        return cast("TextResponse", super()._links_response_no_href())

    def test_follow_None_encoding(self):
        # unlike the base Response, TextResponse.follow() falls back to the
        # response encoding when encoding is None instead of raising
        r = self.response_class("http://example.com", body=b"hello", encoding="cp1252")
        req = r.follow("foo", encoding=None)
        assert req.encoding == "cp1252"

    def test_replace(self) -> None:
        super().test_replace()
        r1 = self.response_class(
            "http://www.example.com", body="hello", encoding="cp852"
        )
        r2 = r1.replace(url="http://www.example.com/other")
        r3 = r1.replace(url="http://www.example.com/other", encoding="latin1")

        assert isinstance(r2, self.response_class)
        assert r2.url == "http://www.example.com/other"
        self._assert_response_encoding(r2, "cp852")
        assert r3.url == "http://www.example.com/other"
        assert r3._declared_encoding() == "latin1"

    def test_unicode_url(self):
        # instantiate with unicode url without encoding (should set default encoding)
        resp = self.response_class("http://www.example.com/")
        self._assert_response_encoding(resp, self.response_class._DEFAULT_ENCODING)

        # make sure urls are converted to str
        resp = self.response_class(url="http://www.example.com/", encoding="utf-8")
        assert isinstance(resp.url, str)

        resp = self.response_class(
            url="http://www.example.com/price/\xa3", encoding="utf-8"
        )
        assert resp.url == to_unicode(b"http://www.example.com/price/\xc2\xa3")
        resp = self.response_class(
            url="http://www.example.com/price/\xa3", encoding="latin-1"
        )
        assert resp.url == "http://www.example.com/price/\xa3"
        resp = self.response_class(
            "http://www.example.com/price/\xa3",
            headers={"Content-type": ["text/html; charset=utf-8"]},
        )
        assert resp.url == to_unicode(b"http://www.example.com/price/\xc2\xa3")
        resp = self.response_class(
            "http://www.example.com/price/\xa3",
            headers={"Content-type": ["text/html; charset=iso-8859-1"]},
        )
        assert resp.url == "http://www.example.com/price/\xa3"

    def test_unicode_body(self):
        unicode_string = (
            "\u043a\u0438\u0440\u0438\u043b\u043b\u0438\u0447\u0435\u0441\u043a\u0438\u0439 "
            "\u0442\u0435\u043a\u0441\u0442"
        )
        with pytest.raises(TypeError):
            self.response_class("http://www.example.com", body="unicode body")

        original_string = unicode_string.encode("cp1251")
        r1 = self.response_class(
            "http://www.example.com", body=original_string, encoding="cp1251"
        )

        # check response.text
        assert isinstance(r1.text, str)
        assert r1.text == unicode_string

    def test_encoding(self):
        r1 = self.response_class(
            "http://www.example.com",
            body=b"\xc2\xa3",
            headers={"Content-type": ["text/html; charset=utf-8"]},
        )
        r2 = self.response_class(
            "http://www.example.com", encoding="utf-8", body="\xa3"
        )
        r3 = self.response_class(
            "http://www.example.com",
            body=b"\xa3",
            headers={"Content-type": ["text/html; charset=iso-8859-1"]},
        )
        r4 = self.response_class("http://www.example.com", body=b"\xa2\xa3")
        r5 = self.response_class(
            "http://www.example.com",
            body=b"\xc2\xa3",
            headers={"Content-type": ["text/html; charset=None"]},
        )
        r6 = self.response_class(
            "http://www.example.com",
            body=b"\xa8D",
            headers={"Content-type": ["text/html; charset=gb2312"]},
        )
        r7 = self.response_class(
            "http://www.example.com",
            body=b"\xa8D",
            headers={"Content-type": ["text/html; charset=gbk"]},
        )
        r8 = self.response_class(
            "http://www.example.com",
            body=codecs.BOM_UTF8 + b"\xc2\xa3",
            headers={"Content-type": ["text/html; charset=cp1251"]},
        )
        r9 = self.response_class(
            "http://www.example.com",
            body=b"\x80",
            headers={
                "Content-type": [b"application/x-download; filename=\x80dummy.txt"]
            },
        )

        assert r1._headers_encoding() == "utf-8"
        assert r2._headers_encoding() is None
        assert r2._declared_encoding() == "utf-8"
        self._assert_response_encoding(r2, "utf-8")
        assert r3._headers_encoding() == "cp1252"
        assert r3._declared_encoding() == "cp1252"
        assert r4._headers_encoding() is None
        assert r5._headers_encoding() is None
        assert r8._headers_encoding() == "cp1251"
        assert r9._headers_encoding() is None
        assert r8._declared_encoding() == "utf-8"
        assert r9._declared_encoding() is None
        self._assert_response_encoding(r5, "utf-8")
        self._assert_response_encoding(r8, "utf-8")
        self._assert_response_encoding(r9, "cp1252")
        assert r4._body_inferred_encoding() is not None
        assert r4._body_inferred_encoding() != "ascii"
        self._assert_response_values(r1, "utf-8", "\xa3")
        self._assert_response_values(r2, "utf-8", "\xa3")
        self._assert_response_values(r3, "iso-8859-1", "\xa3")
        self._assert_response_values(r6, "gb18030", "\u2015")
        self._assert_response_values(r7, "gb18030", "\u2015")
        self._assert_response_values(r9, "cp1252", "€")

        # TextResponse (and subclasses) must be passed a encoding when instantiating with unicode bodies
        with pytest.raises(TypeError):
            self.response_class("http://www.example.com", body="\xa3")

    def test_declared_encoding_invalid(self):
        """Check that unknown declared encodings are ignored"""
        r = self.response_class(
            "http://www.example.com",
            headers={"Content-type": ["text/html; charset=UNKNOWN"]},
            body=b"\xc2\xa3",
        )
        assert r._declared_encoding() is None
        self._assert_response_values(r, "utf-8", "\xa3")

    def test_utf16(self):
        """Test utf-16 because UnicodeDammit is known to have problems with"""
        body = b"\xff\xfeh\x00i\x00"
        r = self.response_class(
            "http://www.example.com",
            body=body,
            encoding="utf-16",
        )
        self._assert_response_values(r, "utf-16", body)

    def test_invalid_utf8_encoded_body_with_valid_utf8_BOM(self):
        r6 = self.response_class(
            "http://www.example.com",
            headers={"Content-type": ["text/html; charset=utf-8"]},
            body=b"\xef\xbb\xbfWORD\xe3\xab",
        )
        assert r6.encoding == "utf-8"
        assert r6.text in {
            "WORD\ufffd\ufffd",  # w3lib < 1.19.0
            "WORD\ufffd",  # w3lib >= 1.19.0
        }

    def test_bom_is_removed_from_body(self):
        # Inferring encoding from body also cache decoded body as sideeffect,
        # this test tries to ensure that calling response.encoding and
        # response.text in indistinct order doesn't affect final
        # values for encoding and decoded body.
        url = "http://example.com"
        body = b"\xef\xbb\xbfWORD"
        headers = {"Content-type": ["text/html; charset=utf-8"]}

        # Test response without content-type and BOM encoding
        response = self.response_class(url, body=body)
        assert response.encoding == "utf-8"
        assert response.text == "WORD"
        response = self.response_class(url, body=body)
        assert response.text == "WORD"
        assert response.encoding == "utf-8"

        # Body caching sideeffect isn't triggered when encoding is declared in
        # content-type header but BOM still need to be removed from decoded
        # body
        response = self.response_class(url, headers=headers, body=body)
        assert response.encoding == "utf-8"
        assert response.text == "WORD"
        response = self.response_class(url, headers=headers, body=body)
        assert response.text == "WORD"
        assert response.encoding == "utf-8"

    def test_replace_wrong_encoding(self):
        """Test invalid chars are replaced properly"""
        r = self.response_class(
            "http://www.example.com",
            encoding="utf-8",
            body=b"PREFIX\xe3\xabSUFFIX",
        )
        # XXX: Policy for replacing invalid chars may suffer minor variations
        # but it should always contain the unicode replacement char ('\ufffd')
        assert "\ufffd" in r.text, repr(r.text)
        assert "PREFIX" in r.text, repr(r.text)
        assert "SUFFIX" in r.text, repr(r.text)

        # Do not destroy html tags due to encoding bugs
        r = self.response_class(
            "http://example.com",
            encoding="utf-8",
            body=b"\xf0<span>value</span>",
        )
        assert "<span>value</span>" in r.text, repr(r.text)

        # FIXME: This test should pass once we stop using BeautifulSoup's UnicodeDammit in TextResponse
        # r = self.response_class("http://www.example.com", body=b'PREFIX\xe3\xabSUFFIX')
        # assert '\ufffd' in r.text, repr(r.text)

    def test_selector(self):
        body = b"<html><head><title>Some page</title><body></body></html>"
        response = self.response_class("http://www.example.com", body=body)

        assert isinstance(response.selector, Selector)
        assert response.selector.type == "html"
        assert response.selector is response.selector  # property is cached
        assert response.selector.response is response

        assert response.selector.xpath("//title/text()").getall() == ["Some page"]
        assert response.selector.css("title::text").getall() == ["Some page"]
        assert response.selector.re("Some (.*)</title>") == ["page"]

    def test_selector_shortcuts(self):
        body = b"<html><head><title>Some page</title><body></body></html>"
        response = self.response_class("http://www.example.com", body=body)

        assert (
            response.xpath("//title/text()").getall()
            == response.selector.xpath("//title/text()").getall()
        )
        assert (
            response.css("title::text").getall()
            == response.selector.css("title::text").getall()
        )

    def test_selector_shortcuts_kwargs(self):
        body = b'<html><head><title>Some page</title><body><p class="content">A nice paragraph.</p></body></html>'
        response = self.response_class("http://www.example.com", body=body)

        assert (
            response.xpath(
                "normalize-space(//p[@class=$pclass])", pclass="content"
            ).getall()
            == response.xpath('normalize-space(//p[@class="content"])').getall()
        )
        assert (
            response.xpath(
                "//title[count(following::p[@class=$pclass])=$pcount]/text()",
                pclass="content",
                pcount=1,
            ).getall()
            == response.xpath(
                '//title[count(following::p[@class="content"])=1]/text()'
            ).getall()
        )

    def test_urljoin_with_base_url(self):
        """Test urljoin shortcut which also evaluates base-url through get_base_url()."""
        body = b'<html><body><base href="https://example.net"></body></html>'
        joined = self.response_class("http://www.example.com", body=body).urljoin(
            "/test"
        )
        absolute = "https://example.net/test"
        assert joined == absolute

        body = b'<html><body><base href="/elsewhere"></body></html>'
        joined = self.response_class("http://www.example.com", body=body).urljoin(
            "test"
        )
        absolute = "http://www.example.com/test"
        assert joined == absolute

        body = b'<html><body><base href="/elsewhere/"></body></html>'
        joined = self.response_class("http://www.example.com", body=body).urljoin(
            "test"
        )
        absolute = "http://www.example.com/elsewhere/test"
        assert joined == absolute

    def test_follow_selector(self):
        resp = self._links_response()
        urls = [
            "http://example.com/sample2.html",
            "http://example.com/sample3.html",
            "http://example.com/sample3.html",
            "http://example.com/sample3.html",
            "http://example.com/sample3.html#foo",
            "http://www.google.com/something",
            "http://example.com/innertag.html",
            "http://example.com/page%204.html",
        ]

        # select <a> elements
        for sellist in [resp.css("a"), resp.xpath("//a")]:
            for sel, url in zip(sellist, urls, strict=True):
                self._assert_followed_url(sel, url, response=resp)

        # select <link> elements
        self._assert_followed_url(
            Selector(text='<link href="foo"></link>').css("link")[0],
            "http://example.com/foo",
            response=resp,
        )

        # href attributes should work
        for sellist in [resp.css("a::attr(href)"), resp.xpath("//a/@href")]:
            for sel, url in zip(sellist, urls, strict=True):
                self._assert_followed_url(sel, url, response=resp)

        # non-a elements are not supported
        with pytest.raises(
            ValueError, match="Only <a> and <link> elements are supported"
        ):
            resp.follow(resp.css("div")[0])

    def test_follow_selector_list(self):
        resp = self._links_response()
        with pytest.raises(ValueError, match="SelectorList"):
            resp.follow(resp.css("a"))  # type: ignore[arg-type]

    def test_follow_selector_invalid(self):
        resp = self._links_response()
        with pytest.raises(ValueError, match="Unsupported"):
            resp.follow(resp.xpath("count(//div)")[0])

    def test_follow_selector_attribute(self):
        resp = self._links_response()
        for src in resp.css("img::attr(src)"):
            self._assert_followed_url(src, "http://example.com/sample2.jpg")

    def test_follow_selector_no_href(self):
        resp = self.response_class(
            url="http://example.com",
            body=b"<html><body><a name=123>click me</a></body></html>",
        )
        with pytest.raises(ValueError, match="no href"):
            resp.follow(resp.css("a")[0])

    def test_follow_whitespace_selector(self):
        resp = self.response_class(
            "http://example.com",
            body=b"""<html><body><a href=" foo\n">click me</a></body></html>""",
        )
        self._assert_followed_url(
            resp.css("a")[0], "http://example.com/foo", response=resp
        )
        self._assert_followed_url(
            resp.css("a::attr(href)")[0],
            "http://example.com/foo",
            response=resp,
        )

    def test_follow_encoding(self):
        resp1 = self.response_class(
            "http://example.com",
            encoding="utf8",
            body='<html><body><a href="foo?привет">click me</a></body></html>'.encode(),
        )
        self._assert_followed_url(
            resp1.css("a")[0],
            "http://example.com/foo?%D0%BF%D1%80%D0%B8%D0%B2%D0%B5%D1%82",
            response=resp1,
            encoding="utf8",
        )

        resp2 = self.response_class(
            "http://example.com",
            encoding="cp1251",
            body='<html><body><a href="foo?привет">click me</a></body></html>'.encode(
                "cp1251"
            ),
        )
        self._assert_followed_url(
            resp2.css("a")[0],
            "http://example.com/foo?%EF%F0%E8%E2%E5%F2",
            response=resp2,
            encoding="cp1251",
        )

    def test_follow_all_css(self):
        expected = [
            "http://example.com/sample3.html",
            "http://example.com/innertag.html",
        ]
        response = self._links_response()
        extracted = [r.url for r in response.follow_all(css='a[href*="example.com"]')]
        assert expected == extracted

    def test_follow_all_css_skip_invalid(self):
        expected = [
            "http://example.com/page/1/",
            "http://example.com/page/3/",
            "http://example.com/page/4/",
        ]
        response = self._links_response_no_href()
        extracted1 = [r.url for r in response.follow_all(css=".pagination a")]
        assert expected == extracted1
        extracted2 = [r.url for r in response.follow_all(response.css(".pagination a"))]
        assert expected == extracted2

    def test_follow_all_xpath(self):
        expected = [
            "http://example.com/sample3.html",
            "http://example.com/innertag.html",
        ]
        response = self._links_response()
        extracted = response.follow_all(xpath='//a[contains(@href, "example.com")]')
        assert expected == [r.url for r in extracted]

    def test_follow_all_xpath_skip_invalid(self):
        expected = [
            "http://example.com/page/1/",
            "http://example.com/page/3/",
            "http://example.com/page/4/",
        ]
        response = self._links_response_no_href()
        extracted1 = [
            r.url for r in response.follow_all(xpath='//div[@id="pagination"]/a')
        ]
        assert expected == extracted1
        extracted2 = [
            r.url
            for r in response.follow_all(response.xpath('//div[@id="pagination"]/a'))
        ]
        assert expected == extracted2

    def test_follow_all_too_many_arguments(self):
        response = self._links_response()
        with pytest.raises(
            ValueError, match="Please supply exactly one of the following arguments"
        ):
            response.follow_all(
                css='a[href*="example.com"]',
                xpath='//a[contains(@href, "example.com")]',
            )

    def test_json_response(self):
        json_body = b"""{"ip": "109.187.217.200"}"""
        json_response = self.response_class("http://www.example.com", body=json_body)
        assert json_response.json() == {"ip": "109.187.217.200"}

        text_body = b"""<html><body>text</body></html>"""
        text_response = self.response_class("http://www.example.com", body=text_body)
        with pytest.raises(
            ValueError, match=r"(Expecting value|Unexpected '<'): line 1"
        ):
            text_response.json()

    def test_json_response_non_utf8(self):
        response = self.response_class(
            "http://www.example.com",
            body='{"message": "café"}'.encode("cp1252"),
            headers={"Content-Type": "application/json"},
        )
        assert response.json() == {"message": "café"}

    def test_json_response_wrong_charset(self):
        response = self.response_class(
            "http://www.example.com",
            body='{"message": "café"}'.encode(),
            headers={"Content-Type": "application/json; charset=iso-8859-1"},
        )
        assert response.json() == {"message": "café"}

    def test_cache_json_response(self):
        json_valid_bodies = [b"""{"ip": "109.187.217.200"}""", b"""null"""]
        for json_body in json_valid_bodies:
            json_response = self.response_class(
                "http://www.example.com", body=json_body
            )

            with mock.patch("json.loads") as mock_json:
                for _ in range(2):
                    json_response.json()
                mock_json.assert_called_once_with(json_body)


class TestHtmlResponse(TestTextResponse):
    response_class = HtmlResponse

    def test_html_encoding(self):
        body = b"""<html><head><title>Some page</title>
        <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
        </head><body>Price: \xa3100</body></html>'
        """
        r1 = self.response_class("http://www.example.com", body=body)
        self._assert_response_values(r1, "iso-8859-1", body)

        body = b"""<?xml version="1.0" encoding="iso-8859-1"?>
        <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
        Price: \xa3100
        """
        r2 = self.response_class("http://www.example.com", body=body)
        self._assert_response_values(r2, "iso-8859-1", body)

        # for conflicting declarations headers must take precedence
        body = b"""<html><head><title>Some page</title>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        </head><body>Price: \xa3100</body></html>'
        """
        r3 = self.response_class(
            "http://www.example.com",
            body=body,
            headers={"Content-type": ["text/html; charset=iso-8859-1"]},
        )
        self._assert_response_values(r3, "iso-8859-1", body)

        # make sure replace() preserves the encoding of the original response
        body = b"New body \xa3"
        r4 = r3.replace(body=body)
        self._assert_response_values(r4, "iso-8859-1", body)

    def test_html5_meta_charset(self):
        body = b"""<html><head><meta charset="gb2312" /><title>Some page</title><body>bla bla</body>"""
        r1 = self.response_class("http://www.example.com", body=body)
        self._assert_response_values(r1, "gb2312", body)


class TestXmlResponse(TestTextResponse):
    response_class = XmlResponse

    def test_xml_encoding(self):
        body = b"<xml></xml>"
        r1 = self.response_class("http://www.example.com", body=body)
        self._assert_response_values(r1, self.response_class._DEFAULT_ENCODING, body)

        body = b"""<?xml version="1.0" encoding="iso-8859-1"?><xml></xml>"""
        r2 = self.response_class("http://www.example.com", body=body)
        self._assert_response_values(r2, "iso-8859-1", body)

        # make sure replace() preserves the explicit encoding passed in the __init__ method
        body = b"""<?xml version="1.0" encoding="iso-8859-1"?><xml></xml>"""
        r3 = self.response_class("http://www.example.com", body=body, encoding="utf-8")
        body2 = b"New body"
        r4 = r3.replace(body=body2)
        self._assert_response_values(r4, "utf-8", body2)

    def test_replace_encoding(self):
        # make sure replace() keeps the previous encoding unless overridden explicitly
        body = b"""<?xml version="1.0" encoding="iso-8859-1"?><xml></xml>"""
        body2 = b"""<?xml version="1.0" encoding="utf-8"?><xml></xml>"""
        r5 = self.response_class("http://www.example.com", body=body)
        r6 = r5.replace(body=body2)
        r7 = r5.replace(body=body2, encoding="utf-8")
        self._assert_response_values(r5, "iso-8859-1", body)
        self._assert_response_values(r6, "iso-8859-1", body2)
        self._assert_response_values(r7, "utf-8", body2)

    def test_selector(self):
        body = b'<?xml version="1.0" encoding="utf-8"?><xml><elem>value</elem></xml>'
        response = self.response_class("http://www.example.com", body=body)

        assert isinstance(response.selector, Selector)
        assert response.selector.type == "xml"
        assert response.selector is response.selector  # property is cached
        assert response.selector.response is response

        assert response.selector.xpath("//elem/text()").getall() == ["value"]

    def test_selector_shortcuts(self):
        body = b'<?xml version="1.0" encoding="utf-8"?><xml><elem>value</elem></xml>'
        response = self.response_class("http://www.example.com", body=body)

        assert (
            response.xpath("//elem/text()").getall()
            == response.selector.xpath("//elem/text()").getall()
        )

    def test_selector_shortcuts_kwargs(self):
        body = b"""<?xml version="1.0" encoding="utf-8"?>
        <xml xmlns:somens="http://scrapy.org">
        <somens:elem>value</somens:elem>
        </xml>"""
        response = self.response_class("http://www.example.com", body=body)

        assert (
            response.xpath(
                "//s:elem/text()", namespaces={"s": "http://scrapy.org"}
            ).getall()
            == response.selector.xpath(
                "//s:elem/text()", namespaces={"s": "http://scrapy.org"}
            ).getall()
        )

        response.selector.register_namespace("s2", "http://scrapy.org")
        assert (
            response.xpath(
                "//s1:elem/text()", namespaces={"s1": "http://scrapy.org"}
            ).getall()
            == response.selector.xpath("//s2:elem/text()").getall()
        )


class CustomResponse(TextResponse):
    attributes = (*TextResponse.attributes, "foo", "bar")

    def __init__(self, *args, **kwargs) -> None:
        self.foo = kwargs.pop("foo", None)
        self.bar = kwargs.pop("bar", None)
        self.lost = kwargs.pop("lost", None)
        super().__init__(*args, **kwargs)


class TestCustomResponse(TestTextResponse):
    response_class = CustomResponse

    def test_copy(self) -> None:
        super().test_copy()
        r1 = self.response_class(
            url="https://example.org",
            status=200,
            foo="foo",
            bar="bar",
            lost="lost",
        )
        r2 = r1.copy()
        assert isinstance(r2, self.response_class)
        assert r1.foo == r2.foo
        assert r1.bar == r2.bar
        assert r1.lost == "lost"
        assert r2.lost is None

    def test_replace(self) -> None:
        super().test_replace()
        r1 = self.response_class(
            url="https://example.org",
            status=200,
            foo="foo",
            bar="bar",
            lost="lost",
        )

        r2 = r1.replace(foo="new-foo", bar="new-bar", lost="new-lost")
        assert isinstance(r2, self.response_class)
        assert r1.foo == "foo"
        assert r1.bar == "bar"
        assert r1.lost == "lost"
        assert r2.foo == "new-foo"
        assert r2.bar == "new-bar"
        assert r2.lost == "new-lost"

        r3 = r1.replace(foo="new-foo", bar="new-bar")
        assert isinstance(r3, self.response_class)
        assert r1.foo == "foo"
        assert r1.bar == "bar"
        assert r1.lost == "lost"
        assert r3.foo == "new-foo"
        assert r3.bar == "new-bar"
        assert r3.lost is None

        r4 = r1.replace(foo="new-foo")
        assert isinstance(r4, self.response_class)
        assert r1.foo == "foo"
        assert r1.bar == "bar"
        assert r1.lost == "lost"
        assert r4.foo == "new-foo"
        assert r4.bar == "bar"
        assert r4.lost is None

        with pytest.raises(
            TypeError,
            match=r"__init__\(\) got an unexpected keyword argument 'unknown'",
        ):
            r1.replace(unknown="unknown")
