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"""Unit tests for the fixed-source local web-search parser."""

from __future__ import annotations

import unittest
from unittest.mock import patch

import httpx

import web_search
from web_search import (
    SearchUnavailable,
    parse_bing_rss,
    parse_duckduckgo_lite,
    parse_google_news_rss,
    search_web,
)


class FakeClient:
    def __enter__(self) -> "FakeClient":
        return self

    def __exit__(self, *_args: object) -> None:
        return None


class WebSearchParserTests(unittest.TestCase):
    def test_duckduckgo_lite_results_and_redirects(self) -> None:
        payload = """
        <html><body>
          <a class="result-link"
             href="//duckduckgo.com/l/?uddg=https%3A%2F%2Fexample.com%2Fdocs&amp;rut=x">
            Example &amp; docs
          </a>
          <td class="result-snippet">A <b>useful</b> result.</td>
        </body></html>
        """
        self.assertEqual(
            parse_duckduckgo_lite(payload),
            [
                {
                    "title": "Example & docs",
                    "url": "https://example.com/docs",
                    "description": "A useful result.",
                    "source": "example.com",
                }
            ],
        )

    def test_bing_rss_results(self) -> None:
        payload = """<?xml version="1.0"?>
        <rss><channel><item>
          <title>Projeto</title>
          <link>https://example.org/project</link>
          <description>Uma &lt;b&gt;descrição&lt;/b&gt;.</description>
        </item></channel></rss>
        """
        self.assertEqual(
            parse_bing_rss(payload),
            [
                {
                    "title": "Projeto",
                    "url": "https://example.org/project",
                    "description": "Uma descrição.",
                    "source": "example.org",
                }
            ],
        )

    def test_google_news_rss_parses_date_and_source(self) -> None:
        payload = """<?xml version="1.0" encoding="UTF-8"?>
        <rss><channel><item>
          <title>Operação acontece no Rio de Janeiro</title>
          <link>https://news.google.com/rss/articles/example</link>
          <description><![CDATA[
            <a href="https://example.com/rj">Operação acontece no Rio de Janeiro</a>
            <p>Forças de segurança divulgaram o balanço.</p>
            <font>O GLOBO</font>
          ]]></description>
          <pubDate>Tue, 04 Aug 2026 17:11:11 GMT</pubDate>
          <source url="https://oglobo.globo.com">O GLOBO</source>
        </item></channel></rss>
        """
        self.assertEqual(
            parse_google_news_rss(payload),
            [
                {
                    "title": "Operação acontece no Rio de Janeiro",
                    "url": "https://news.google.com/rss/articles/example",
                    "description": (
                        "Publicado em 04/08/2026 17:11 UTC — Fonte: O GLOBO. "
                        "Forças de segurança divulgaram o balanço."
                    ),
                    "source": "O GLOBO",
                }
            ],
        )

    def test_google_news_rss_rejects_unsafe_link(self) -> None:
        payload = """<rss><channel><item>
          <title>Resultado inseguro</title>
          <link>javascript:alert(1)</link>
          <pubDate>Tue, 04 Aug 2026 17:11:11 GMT</pubDate>
          <source>Fonte</source>
        </item></channel></rss>"""
        self.assertEqual(parse_google_news_rss(payload), [])

    def test_invalid_result_scheme_is_rejected(self) -> None:
        payload = """
        <a class="result-link" href="javascript:alert(1)">Inseguro</a>
        <td class="result-snippet">Não deve aparecer.</td>
        """
        self.assertEqual(parse_duckduckgo_lite(payload), [])

    def test_invalid_result_does_not_replace_previous_snippet(self) -> None:
        payload = """
        <a class="result-link" href="https://example.com/valid">Valido</a>
        <td class="result-snippet">Descricao valida.</td>
        <a class="result-link" href="javascript:alert(1)">Inseguro</a>
        <td class="result-snippet">Descricao insegura.</td>
        """
        self.assertEqual(
            parse_duckduckgo_lite(payload),
            [
                {
                    "title": "Valido",
                    "url": "https://example.com/valid",
                    "description": "Descricao valida.",
                    "source": "example.com",
                }
            ],
        )


class WebSearchAggregationTests(unittest.TestCase):
    def test_recent_news_aggregates_and_prioritizes_rio_de_janeiro(self) -> None:
        google_results = [
            {
                "title": "Agenda cultural em Porto Alegre, RS",
                "url": "https://gauchazh.clicrbs.com.br/porto-alegre/noticia",
                "description": "Publicado em 04/08/2026 17:00 UTC — Fonte: GZH.",
                "source": "GZH",
            },
            {
                "title": "Prefeitura do Rio de Janeiro anuncia medida",
                "url": "https://example.com/rj/prefeitura",
                "description": "Publicado em 04/08/2026 16:00 UTC — Fonte: Jornal RJ.",
                "source": "Jornal RJ",
            },
        ]
        duck_results = [
            {
                "title": "Prefeitura do Rio de Janeiro anuncia medida",
                "url": "https://duplicate.example/noticia",
                "description": "Resultado duplicado vindo de outro provedor.",
                "source": "duplicate.example",
            },
            {
                "title": "Trânsito no RJ tem alteração nesta terça",
                "url": "https://example.org/noticias/rj/transito",
                "description": "Mudança afeta vias da capital fluminense.",
                "source": "example.org",
            },
        ]

        with (
            patch("web_search.httpx.Client", return_value=FakeClient()),
            patch(
                "web_search._google_news_rss",
                return_value=google_results,
            ) as google,
            patch(
                "web_search._duckduckgo_lite",
                return_value=duck_results,
            ) as duck,
            patch("web_search._bing_rss") as bing,
        ):
            result = search_web("últimas notícias do RJ hoje")

        self.assertEqual(result["provider"], "google-news+duckduckgo-lite")
        self.assertEqual(
            [item["title"] for item in result["results"]],
            [
                "Prefeitura do Rio de Janeiro anuncia medida",
                "Trânsito no RJ tem alteração nesta terça",
                "Agenda cultural em Porto Alegre, RS",
            ],
        )
        google.assert_called_once()
        duck.assert_called_once()
        bing.assert_not_called()

    def test_recent_news_falls_back_when_primary_providers_fail(self) -> None:
        bing_result = {
            "title": "Notícia do Rio de Janeiro",
            "url": "https://example.net/rj/noticia",
            "description": "Informação atualizada.",
            "source": "example.net",
        }
        network_error = httpx.ConnectError("offline")

        with (
            patch("web_search.httpx.Client", return_value=FakeClient()),
            patch("web_search._google_news_rss", side_effect=network_error),
            patch("web_search._duckduckgo_lite", return_value=[]),
            patch("web_search._bing_rss", return_value=[bing_result]),
        ):
            result = search_web("notícias recentes do Rio de Janeiro")

        self.assertEqual(result["provider"], "bing-rss")
        self.assertEqual(result["results"], [bing_result])

    def test_general_search_aggregates_existing_providers(self) -> None:
        duck_result = {
            "title": "Documentação do projeto",
            "url": "https://example.com/docs",
            "description": "Guia principal.",
            "source": "example.com",
        }
        bing_result = {
            "title": "Repositório do projeto",
            "url": "https://github.com/example/project",
            "description": "Código fonte.",
            "source": "github.com",
        }

        with (
            patch("web_search.httpx.Client", return_value=FakeClient()),
            patch("web_search._duckduckgo_lite", return_value=[duck_result]),
            patch("web_search._bing_rss", return_value=[bing_result]),
            patch("web_search._wikipedia") as wikipedia,
            patch("web_search._google_news_rss") as google_news,
        ):
            result = search_web("documentação projeto")

        self.assertEqual(result["provider"], "duckduckgo-lite+bing-rss")
        self.assertEqual(len(result["results"]), 2)
        wikipedia.assert_not_called()
        google_news.assert_not_called()

    def test_all_providers_unavailable_preserves_search_error(self) -> None:
        network_error = httpx.ConnectError("offline")
        with (
            patch("web_search.httpx.Client", return_value=FakeClient()),
            patch("web_search._google_news_rss", side_effect=network_error),
            patch("web_search._duckduckgo_lite", return_value=[]),
            patch("web_search._bing_rss", side_effect=network_error),
        ):
            with self.assertRaisesRegex(SearchUnavailable, "google-news"):
                search_web("últimas notícias")


if __name__ == "__main__":
    unittest.main()