"""Tests for the recommender module."""

import json
from unittest.mock import MagicMock, patch

import pytest

# Import the units under test from the recommender module
from src.services.recommender import (
    _enrich_one_item,
    _fetch_wiki_image,
    _haversine_km,
    _is_media_entertainment_page,
    _parse_json_response,
    name_key,
)


# ──────────────────────────────────────────────────────────────────────
# 1. _parse_json_response
# ──────────────────────────────────────────────────────────────────────
class TestParseJsonResponse:
    """Tests for _parse_json_response — robust LLM JSON extraction."""

    def test_valid_json_array(self):
        """Parses a standard JSON array."""
        result = _parse_json_response('[{"name": "Eiffel Tower"}, {"name": "Louvre"}]')
        assert result == [{"name": "Eiffel Tower"}, {"name": "Louvre"}]

    def test_valid_json_object_wraps_to_list(self):
        """A bare JSON object is wrapped into a single-element list."""
        result = _parse_json_response('{"name": "Sagrada Familia", "city": "Barcelona"}')
        assert result == [{"name": "Sagrada Familia", "city": "Barcelona"}]

    def test_json_in_markdown_fences(self):
        """Strips ```json ... ``` fences before parsing."""
        raw = '```json\n[{"name": "Colosseum"}]\n```'
        result = _parse_json_response(raw)
        assert result == [{"name": "Colosseum"}]

    def test_truncated_json_last_object_missing_brace(self):
        """Truncated JSON without closing bracket returns None — parser requires a ']'.

        The function only attempts bracket-delimited recovery when both [ and ] are
        present. A truly truncated stream with no closing ] is unresolvable.
        """
        raw = '[{"name": "Eiffel"}, {"name": "Louvre"'
        result = _parse_json_response(raw)
        assert result is None

    def test_empty_string_returns_none(self):
        """Empty string yields None."""
        assert _parse_json_response("") is None

    def test_whitespace_only_returns_none(self):
        """Whitespace-only string yields None."""
        assert _parse_json_response("   \n\t  ") is None

    def test_garbage_string_returns_none(self):
        """Non-JSON garbage returns None."""
        assert _parse_json_response("not json at all") is None

    def test_none_like_text_returns_none(self):
        """Random text that happens to have braces but is not valid JSON."""
        result = _parse_json_response("just some random { text } with [ brackets")
        assert result is None


# ──────────────────────────────────────────────────────────────────────
# 2. _haversine_km
# ──────────────────────────────────────────────────────────────────────
class TestHaversineKm:
    """Tests for haversine distance calculation."""

    def test_london_to_paris(self):
        """London → Paris is approximately 344 km."""
        # London: 51.5074° N, 0.1278° W
        # Paris:  48.8566° N, 2.3522° E
        dist = _haversine_km(51.5074, -0.1278, 48.8566, 2.3522)
        assert 330 <= dist <= 360, f"Expected ~344 km, got {dist:.1f}"

    def test_tokyo_to_osaka(self):
        """Tokyo → Osaka is approximately 403 km."""
        # Tokyo: 35.6762° N, 139.6503° E
        # Osaka: 34.6937° N, 135.5023° E
        dist = _haversine_km(35.6762, 139.6503, 34.6937, 135.5023)
        assert 390 <= dist <= 420, f"Expected ~403 km, got {dist:.1f}"

    def test_same_point_zero_distance(self):
        """Distance from a point to itself is zero."""
        dist = _haversine_km(48.8566, 2.3522, 48.8566, 2.3522)
        assert dist == pytest.approx(0.0, abs=0.001)

    def test_symmetric(self):
        """Haversine is symmetric (A→B equals B→A)."""
        a = (40.7128, -74.0060)  # NYC
        b = (34.0522, -118.2437)  # LA
        assert _haversine_km(*a, *b) == pytest.approx(_haversine_km(*b, *a))


# ──────────────────────────────────────────────────────────────────────
# 3. _is_media_entertainment_page
# ──────────────────────────────────────────────────────────────────────
class TestIsMediaEntertainmentPage:
    """Tests for detecting non-tourist media/entertainment Wikipedia pages."""

    # The function takes (title, extract). All test cases below focus on
    # title-based detection (disambiguation patterns) with empty extracts.
    # The extract-based detection is tested separately.

    def test_star_wars_film(self):
        """Film disambiguation in title → True."""
        assert _is_media_entertainment_page("Star Wars (film)", "") is True

    def test_dark_knight_movie(self):
        """Movie disambiguation in title → True."""
        assert _is_media_entertainment_page("The Dark Knight (movie)", "") is True

    def test_friends_tv_series(self):
        """TV series disambiguation in title → True."""
        assert _is_media_entertainment_page("Friends (TV series)", "") is True

    def test_short_film_media(self):
        """'short film' disambiguation pattern in title → True."""
        assert _is_media_entertainment_page("Colosseum (short film)", "") is True

    def test_eiffel_tower_not_media(self):
        """Real landmark with no media indicator → False."""
        assert _is_media_entertainment_page("Eiffel Tower", "") is False

    def test_central_park_not_media(self):
        """Park with no media indicator → False."""
        assert _is_media_entertainment_page("Central Park", "") is False

    def test_extract_based_detection(self):
        """Title is clean but extract reveals it's a film."""
        assert _is_media_entertainment_page(
            "Inception",
            "Inception is a 2010 science fiction film directed by Christopher Nolan...",
        ) is True

    def test_extract_tv_series_detection(self):
        """Extract reveals TV series."""
        assert _is_media_entertainment_page(
            "Breaking Bad",
            "Breaking Bad is an American television series created by Vince Gilligan...",
        ) is True

    def test_clean_title_and_extract(self):
        """Both title and extract are about a real place → False."""
        assert _is_media_entertainment_page(
            "Machu Picchu",
            "Machu Picchu is a 15th-century Inca citadel situated on a mountain ridge...",
        ) is False


# ──────────────────────────────────────────────────────────────────────
# 4. name_key
# ──────────────────────────────────────────────────────────────────────
class TestNameKey:
    """Tests for attraction name normalization for deduplication."""

    def test_eiffel_tower(self):
        """Simple name: 'Tower' is an attraction suffix so it gets stripped."""
        # " tower" is in _ATTRACTION_SUFFIXES, so it's removed from the key
        assert name_key({"name": "Eiffel Tower"}) == "eiffel"

    def test_louvre_museum(self):
        """Museum suffix is stripped from the normalized key."""
        assert name_key({"name": "Louvre Museum"}) == "louvre"

    def test_notre_dame_with_parenthetical_and_church_suffix(self):
        """Parenthetical removed, ' Church' suffix removed, non-alphanumeric stripped."""
        # ' church' IS in _ATTRACTION_SUFFIXES (unlike ' cathedral')
        result = name_key({"name": "Notre-Dame Church (Paris)"})
        assert result == "notredame"

    def test_empty_name(self):
        """Empty name returns empty string."""
        assert name_key({"name": ""}) == ""

    def test_missing_name_key(self):
        """Item dict with no 'name' key returns empty string."""
        assert name_key({}) == ""

    def test_same_name_with_different_punctuation(self):
        """Punctuation differences produce the same key."""
        key1 = name_key({"name": "St. Peter's Basilica"})
        key2 = name_key({"name": "St Peters Basilica"})
        assert key1 == key2

    def test_same_name_different_casing(self):
        """Case differences produce the same key."""
        key1 = name_key({"name": "COLOSSEUM"})
        key2 = name_key({"name": "colosseum"})
        assert key1 == key2


# ──────────────────────────────────────────────────────────────────────
# 5. _fetch_wiki_image
# ──────────────────────────────────────────────────────────────────────
class TestFetchWikiImage:
    """Integration-style tests for Wikipedia image fetching with mocked HTTP."""

    def test_returns_thumbnail_url_when_present(self):
        """Mocks _http_get_json to return a thumbnail; function returns URL."""
        with patch("src.services.recommender._http_get_json") as mock_get:
            # First call: _resolve_wiki_title → Wikipedia search API
            # Second call: REST summary API with thumbnail
            def side_effect(url, **kwargs):
                if "action=query" in url and "list=search" in url:
                    return {
                        "query": {
                            "search": [{"title": "Eiffel Tower"}]
                        }
                    }
                if "rest_v1/page/summary" in url:
                    return {
                        "title": "Eiffel Tower",
                        "extract": "The Eiffel Tower is a wrought-iron lattice tower...",
                        "thumbnail": {"source": "https://upload.wikimedia.org/thumb_eiffel.jpg"},
                    }
                return None

            mock_get.side_effect = side_effect

            result = _fetch_wiki_image("Eiffel Tower", city="Paris")
            assert result == "https://upload.wikimedia.org/thumb_eiffel.jpg"

    def test_returns_empty_string_when_no_thumbnail(self):
        """When no thumbnail is found across all candidates, returns ''."""
        with patch("src.services.recommender._http_get_json") as mock_get:
            def side_effect(url, **kwargs):
                if "action=query" in url and "list=search" in url:
                    return {
                        "query": {
                            "search": [{"title": "Some Obscure Place"}]
                        }
                    }
                if "rest_v1/page/summary" in url:
                    # Summary exists but no thumbnail
                    return {
                        "title": "Some Obscure Place",
                        "extract": "Some Obscure Place is a location...",
                    }
                if "prop=pageimages" in url:
                    # pageimages API also has no thumbnail
                    return {
                        "query": {
                            "pages": {
                                "12345": {
                                    "pageid": 12345,
                                    "title": "Some Obscure Place",
                                }
                            }
                        }
                    }
                return None

            mock_get.side_effect = side_effect

            result = _fetch_wiki_image("Some Obscure Place")
            assert result == ""

    def test_returns_empty_string_when_search_finds_nothing(self):
        """When Wikipedia search returns no results, returns ''."""
        with patch("src.services.recommender._http_get_json") as mock_get:
            def side_effect(url, **kwargs):
                if "action=query" in url and "list=search" in url:
                    return {"query": {"search": []}}
                return None

            mock_get.side_effect = side_effect

            result = _fetch_wiki_image("XyzzyNonexistentPlace")
            assert result == ""


# ──────────────────────────────────────────────────────────────────────
# 6. _enrich_one_item — Pixabay fallback re-check
# ──────────────────────────────────────────────────────────────────────
class TestEnrichOneItemPixabayRecheck:
    """Tests for Pixabay fallback re-checking Wikipedia/Wikidata for specific images.

    When Pixabay returns a generic stock photo, the function re-checks
    Wikipedia/Wikidata tiers (which may have been rate-limited on first pass).
    If a specific Wikimedia image is now available, it should be preferred.
    """

    def test_prefers_wikipedia_over_pixabay_on_recheck(self):
        """After Pixabay returns a URL, re-check Wikipedia finds a specific
        image -> use Wikipedia URL instead of Pixabay generic."""
        item = {"name": "Adashino Nenbutsuji"}

        with (
            patch("src.services.recommender._IMAGE_CACHE", {}),
            patch("src.services.recommender._fetch_wiki_image") as mock_wiki,
            patch("src.services.recommender._fetch_wiki_image_multilang", return_value=""),
            patch("src.services.recommender._fetch_wikidata_image", return_value=""),
            patch("src.services.recommender._fetch_commons_image", return_value=""),
            patch("src.services.recommender._fetch_local_name_image", return_value=""),
            patch("src.services.recommender._fetch_pixabay_api_image", return_value="https://pixabay.com/generic.jpg"),
            patch("src.services.recommender._fetch_unsplash_api_image", return_value=""),
            patch("src.services.recommender._save_image_cache"),
        ):
            # First call (Tier 1): Wikipedia fails (rate-limited)
            # Second call (second chance after Pixabay): Wikipedia succeeds
            mock_wiki.side_effect = ["", "https://upload.wikimedia.org/specific.jpg"]

            _enrich_one_item(item, city="Kyoto")

            assert item["image_url"] == "https://upload.wikimedia.org/specific.jpg"

    def test_prefers_wikidata_over_pixabay_on_recheck(self):
        """After Pixabay returns a URL and Wikipedia still fails, re-check
        Wikidata finds a specific image -> use Wikidata URL instead."""
        item = {"name": "Some Temple"}

        with (
            patch("src.services.recommender._IMAGE_CACHE", {}),
            patch("src.services.recommender._fetch_wiki_image", return_value=""),
            patch("src.services.recommender._fetch_wiki_image_multilang", return_value=""),
            patch("src.services.recommender._fetch_wikidata_image") as mock_wikidata,
            patch("src.services.recommender._fetch_commons_image", return_value=""),
            patch("src.services.recommender._fetch_local_name_image", return_value=""),
            patch("src.services.recommender._fetch_pixabay_api_image", return_value="https://pixabay.com/generic.jpg"),
            patch("src.services.recommender._fetch_unsplash_api_image", return_value=""),
            patch("src.services.recommender._save_image_cache"),
        ):
            # First call (Tier 3): Wikidata fails (rate-limited)
            # Second call (second chance after Pixabay): Wikidata succeeds
            mock_wikidata.side_effect = ["", "https://upload.wikimedia.org/commons/specific.jpg"]

            _enrich_one_item(item, city="Kyoto")

            assert item["image_url"] == "https://upload.wikimedia.org/commons/specific.jpg"

    def test_keeps_pixabay_when_both_wikipedia_and_wikidata_still_fail(self):
        """When both re-checks still fail, Pixabay URL is used as-is."""
        item = {"name": "Obscure Place"}

        with (
            patch("src.services.recommender._IMAGE_CACHE", {}),
            patch("src.services.recommender._fetch_wiki_image", return_value=""),
            patch("src.services.recommender._fetch_wiki_image_multilang", return_value=""),
            patch("src.services.recommender._fetch_wikidata_image", return_value=""),
            patch("src.services.recommender._fetch_commons_image", return_value=""),
            patch("src.services.recommender._fetch_local_name_image", return_value=""),
            patch("src.services.recommender._fetch_pixabay_api_image", return_value="https://pixabay.com/generic.jpg"),
            patch("src.services.recommender._fetch_unsplash_api_image", return_value=""),
            patch("src.services.recommender._save_image_cache"),
        ):
            _enrich_one_item(item, city="Kyoto")

            assert item["image_url"] == "https://pixabay.com/generic.jpg"