"""Unit tests for ops.py's pure JSON-walking helpers.

OPS's XML-to-JSON conversion is the trickiest part of this module: text
nodes become {"$": "..."}, attributes become "@name" keys, and a repeated
XML element becomes a list *unless there's only one*, in which case it stays
a bare dict. Every helper here has to handle both shapes; these tests pin
both for each one.
"""

import pytest

from ops import (
    _as_list,
    _text,
    _pick_lang,
    _epodoc_number,
    _extract_title,
    _extract_abstract,
    _extract_classifications,
    _fulltext_paragraphs,
    _to_cql,
    _normalize_epodoc,
)


class TestAsList:
    def test_none_becomes_empty_list(self):
        assert _as_list(None) == []

    def test_single_dict_is_wrapped(self):
        assert _as_list({"a": 1}) == [{"a": 1}]

    def test_list_passes_through_unchanged(self):
        assert _as_list([{"a": 1}, {"a": 2}]) == [{"a": 1}, {"a": 2}]


class TestText:
    def test_extracts_dollar_key(self):
        assert _text({"$": "hello"}) == "hello"

    def test_plain_string_passes_through(self):
        assert _text("hello") == "hello"

    def test_none_for_anything_else(self):
        assert _text(None) is None
        assert _text({"@lang": "en"}) is None


class TestPickLang:
    def test_picks_requested_language_from_list(self):
        nodes = [{"@lang": "de", "$": "Hallo"}, {"@lang": "en", "$": "Hello"}]
        assert _pick_lang(nodes) == {"@lang": "en", "$": "Hello"}

    def test_falls_back_to_first_when_language_missing(self):
        nodes = [{"@lang": "de", "$": "Hallo"}, {"@lang": "fr", "$": "Bonjour"}]
        assert _pick_lang(nodes) == {"@lang": "de", "$": "Hallo"}

    def test_single_dict_not_wrapped_in_a_list_still_works(self):
        node = {"@lang": "en", "$": "Hello"}
        assert _pick_lang(node) == node

    def test_empty_input_returns_none(self):
        assert _pick_lang(None) is None
        assert _pick_lang([]) is None


class TestEpodocNumber:
    def test_prefers_the_epodoc_document_id(self):
        exchange_doc = {
            "@country": "US",
            "@doc-number": "11930446",
            "bibliographic-data": {
                "publication-reference": {
                    "document-id": [
                        {"@document-id-type": "docdb", "doc-number": {"$": "11930446"}},
                        {"@document-id-type": "epodoc", "doc-number": {"$": "US11930446"}},
                    ]
                }
            },
        }
        assert _epodoc_number(exchange_doc) == "US11930446"

    def test_falls_back_to_country_plus_doc_number(self):
        exchange_doc = {"@country": "US", "@doc-number": "11930446", "bibliographic-data": {}}
        assert _epodoc_number(exchange_doc) == "US11930446"

    def test_none_when_nothing_available(self):
        assert _epodoc_number({"bibliographic-data": {}}) is None


class TestExtractTitle:
    def test_from_a_list_of_languages(self):
        bd = {"invention-title": [{"@lang": "en", "$": "Widget"}, {"@lang": "de", "$": "Widget-DE"}]}
        assert _extract_title(bd) == "Widget"

    def test_from_a_single_bare_dict(self):
        bd = {"invention-title": {"@lang": "en", "$": "Widget"}}
        assert _extract_title(bd) == "Widget"

    def test_none_when_missing(self):
        assert _extract_title({}) is None


class TestExtractAbstract:
    def test_joins_paragraphs_from_a_list(self):
        doc = {"abstract": [{"@lang": "en", "p": [{"$": "Part one."}, {"$": "Part two."}]}]}
        assert _extract_abstract(doc) == "Part one. Part two."

    def test_single_paragraph_not_wrapped_in_a_list(self):
        doc = {"abstract": {"@lang": "en", "p": {"$": "Only paragraph."}}}
        assert _extract_abstract(doc) == "Only paragraph."

    def test_none_when_missing(self):
        assert _extract_abstract({}) is None


class TestExtractClassifications:
    def test_builds_codes_from_the_five_part_symbol(self):
        bd = {
            "patent-classifications": {
                "patent-classification": [
                    {
                        "section": {"$": "G"},
                        "class": {"$": "06"},
                        "subclass": {"$": "F"},
                        "main-group": {"$": "17"},
                        "subgroup": {"$": "30"},
                    }
                ]
            }
        }
        codes = _extract_classifications(bd)
        assert len(codes) == 1
        assert codes[0].code == "G06F17/30"
        assert codes[0].description == ""

    def test_dedupes_and_skips_incomplete_entries(self):
        bd = {
            "patent-classifications": {
                "patent-classification": [
                    {"section": {"$": "G"}, "class": {"$": "06"}, "subclass": {"$": "F"}, "main-group": {"$": "17"}, "subgroup": {"$": "30"}},
                    {"section": {"$": "G"}, "class": {"$": "06"}, "subclass": {"$": "F"}, "main-group": {"$": "17"}, "subgroup": {"$": "30"}},
                    {"section": {"$": "H"}},  # incomplete - no class/subclass/main-group
                ]
            }
        }
        codes = _extract_classifications(bd)
        assert [c.code for c in codes] == ["G06F17/30"]

    def test_none_when_no_classifications(self):
        assert _extract_classifications({}) is None


class TestFulltextParagraphs:
    def test_claims_join_claim_text_lines(self):
        data = {
            "ops:world-patent-data": {
                "ftxt:fulltext-documents": {
                    "ftxt:fulltext-document": {
                        "claims": {
                            "@lang": "en",
                            "claim": [
                                {"claim-text": {"$": "1. A widget."}},
                                {"claim-text": [{"$": "2. A gadget,"}, {"$": "further comprising a mechanism."}]},
                            ],
                        }
                    }
                }
            }
        }
        assert _fulltext_paragraphs(data, "claims") == (
            "1. A widget.\n2. A gadget,\nfurther comprising a mechanism."
        )

    def test_description_joins_paragraphs(self):
        data = {
            "ops:world-patent-data": {
                "ftxt:fulltext-documents": {
                    "ftxt:fulltext-document": {
                        "description": {"@lang": "en", "p": [{"$": "Para one."}, {"$": "Para two."}]}
                    }
                }
            }
        }
        assert _fulltext_paragraphs(data, "description") == "Para one.\nPara two."

    def test_none_when_document_missing(self):
        assert _fulltext_paragraphs({"ops:world-patent-data": {}}, "claims") is None


@pytest.mark.parametrize(
    "raw, expected",
    [
        ("widget", 'txt all "widget"'),
        ("agentic ai", 'txt all "agentic ai"'),
        ('pn = "US1234"', 'pn = "US1234"'),
        ("", ""),
        ('has "quotes"', 'txt all "has  quotes"'),
    ],
)
def test_to_cql(raw, expected):
    assert _to_cql(raw) == expected


@pytest.mark.parametrize(
    "raw, expected",
    [
        ("US11930446B2", "US11930446"),
        ("EP4760514A1", "EP4760514"),
        ("US 11930446 B2", "US11930446"),
        ("US11930446", "US11930446"),
    ],
)
def test_normalize_epodoc(raw, expected):
    assert _normalize_epodoc(raw) == expected