"""
Deep behavioral tests for rating storage logic patterns.
Tests rating distribution, summary aggregation, vote counting,
quality average calculation, and upsert patterns.
"""


# --- Rating distribution ---


class TestRatingDistributionLogic:
    """Tests for _get_rating_distribution logic pattern."""

    def _get_distribution(self, ratings):
        distribution = {1: 0, 2: 0, 3: 0, 4: 0, 5: 0}
        for rating in ratings:
            if 1 <= rating <= 5:
                distribution[rating] += 1
        return distribution

    def test_empty_input(self):
        assert self._get_distribution([]) == {1: 0, 2: 0, 3: 0, 4: 0, 5: 0}

    def test_single_one(self):
        result = self._get_distribution([1])
        assert result[1] == 1

    def test_single_five(self):
        result = self._get_distribution([5])
        assert result[5] == 1

    def test_all_same(self):
        result = self._get_distribution([3, 3, 3])
        assert result[3] == 3
        assert result[1] == 0

    def test_all_values(self):
        result = self._get_distribution([1, 2, 3, 4, 5])
        for k in range(1, 6):
            assert result[k] == 1

    def test_out_of_range_zero(self):
        result = self._get_distribution([0])
        assert result == {1: 0, 2: 0, 3: 0, 4: 0, 5: 0}

    def test_out_of_range_six(self):
        result = self._get_distribution([6])
        assert result == {1: 0, 2: 0, 3: 0, 4: 0, 5: 0}

    def test_negative(self):
        result = self._get_distribution([-1])
        assert result == {1: 0, 2: 0, 3: 0, 4: 0, 5: 0}

    def test_mixed_valid_invalid(self):
        result = self._get_distribution([0, 1, 6, 2, -1, 3, 100])
        assert result == {1: 1, 2: 1, 3: 1, 4: 0, 5: 0}

    def test_large_count(self):
        result = self._get_distribution([4] * 1000)
        assert result[4] == 1000


# --- Quality average calculation ---


class TestQualityAverageCalculation:
    """Tests for quality rating average calculation."""

    def test_simple_average(self):
        values = [3, 4, 5]
        avg = sum(values) / len(values)
        assert avg == 4.0

    def test_single_value(self):
        values = [5]
        avg = sum(values) / len(values)
        assert avg == 5.0

    def test_all_ones(self):
        values = [1, 1, 1]
        avg = sum(values) / len(values)
        assert avg == 1.0

    def test_empty_returns_zero(self):
        values = []
        avg = sum(values) / len(values) if values else 0
        assert avg == 0

    def test_fractional_average(self):
        values = [1, 2]
        avg = sum(values) / len(values)
        assert avg == 1.5

    def test_all_fives(self):
        values = [5, 5, 5, 5, 5]
        avg = sum(values) / len(values)
        assert avg == 5.0

    def test_realistic_distribution(self):
        values = [3, 4, 5, 4, 3, 2, 4, 5, 3, 4]
        avg = sum(values) / len(values)
        assert abs(avg - 3.7) < 0.01


# --- Relevance vote counting ---


class TestRelevanceVoteCounting:
    """Tests for relevance vote counting patterns."""

    def test_count_up_votes(self):
        values = ["up", "down", "up", "up"]
        up = sum(1 for v in values if v == "up")
        assert up == 3

    def test_count_down_votes(self):
        values = ["up", "down", "up", "down"]
        down = sum(1 for v in values if v == "down")
        assert down == 2

    def test_net_score_positive(self):
        up, down = 10, 3
        assert up - down == 7

    def test_net_score_negative(self):
        up, down = 2, 8
        assert up - down == -6

    def test_net_score_zero(self):
        up, down = 5, 5
        assert up - down == 0

    def test_no_votes(self):
        values = []
        up = sum(1 for v in values if v == "up")
        down = sum(1 for v in values if v == "down")
        assert up == 0
        assert down == 0


# --- isdigit filter ---


class TestIsdigitFilter:
    """Tests for the isdigit filter pattern used in rating values."""

    def test_valid_digits(self):
        raw = ["1", "2", "3", "4", "5"]
        filtered = [int(v) for v in raw if v.isdigit()]
        assert filtered == [1, 2, 3, 4, 5]

    def test_non_digit_filtered(self):
        raw = ["3", "four", "5"]
        filtered = [int(v) for v in raw if v.isdigit()]
        assert filtered == [3, 5]

    def test_empty_string_filtered(self):
        raw = ["3", "", "5"]
        filtered = [int(v) for v in raw if v.isdigit()]
        assert filtered == [3, 5]

    def test_float_string_filtered(self):
        raw = ["3.5", "4"]
        filtered = [int(v) for v in raw if v.isdigit()]
        # "3.5" is not a digit string
        assert filtered == [4]

    def test_negative_filtered(self):
        raw = ["-1", "3"]
        filtered = [int(v) for v in raw if v.isdigit()]
        # "-1" is not a digit string
        assert filtered == [3]

    def test_all_invalid(self):
        raw = ["abc", "", "x.y"]
        filtered = [int(v) for v in raw if v.isdigit()]
        assert filtered == []


# --- Rating summary structure ---


class TestRatingSummaryStructure:
    """Tests for the rating summary response structure."""

    def test_has_item_id(self):
        summary = {
            "item_id": "card-123",
            "item_type": "card",
            "quality": {"count": 0, "average": 0, "distribution": {}},
            "relevance": {"up_votes": 0, "down_votes": 0, "net_score": 0},
        }
        assert summary["item_id"] == "card-123"

    def test_has_quality_section(self):
        summary = {
            "item_id": "card-123",
            "item_type": "card",
            "quality": {
                "count": 5,
                "average": 3.8,
                "distribution": {1: 0, 2: 0, 3: 1, 4: 3, 5: 1},
            },
            "relevance": {"up_votes": 10, "down_votes": 2, "net_score": 8},
        }
        assert summary["quality"]["count"] == 5
        assert summary["quality"]["average"] == 3.8

    def test_has_relevance_section(self):
        summary = {
            "item_id": "card-123",
            "item_type": "card",
            "quality": {"count": 0, "average": 0, "distribution": {}},
            "relevance": {"up_votes": 10, "down_votes": 2, "net_score": 8},
        }
        assert summary["relevance"]["up_votes"] == 10
        assert summary["relevance"]["down_votes"] == 2
        assert summary["relevance"]["net_score"] == 8

    def test_net_score_matches_calculation(self):
        up = 15
        down = 7
        summary = {
            "relevance": {
                "up_votes": up,
                "down_votes": down,
                "net_score": up - down,
            },
        }
        assert summary["relevance"]["net_score"] == 8


# --- Upsert pattern ---


class TestUpsertPattern:
    """Tests for the create-or-update (upsert) pattern."""

    def test_create_when_no_existing(self):
        existing = None
        if existing:
            action = "update"
        else:
            action = "create"
        assert action == "create"

    def test_update_when_existing(self):
        existing = {"id": 1, "rating_value": "up"}
        if existing:
            action = "update"
        else:
            action = "create"
        assert action == "update"

    def test_existing_id_used_for_update(self):
        existing = {"id": 42, "rating_value": "up"}
        if existing:
            update_id = str(existing["id"])
        else:
            update_id = None
        assert update_id == "42"


# --- Item type patterns ---


class TestItemTypePatterns:
    """Tests for item type handling in rating storage."""

    def test_default_item_type_card(self):
        item_type = "card"
        assert item_type == "card"

    def test_news_item_type(self):
        item_type = "news_item"
        is_card = item_type == "card"
        assert not is_card

    def test_card_id_backward_compat(self):
        """card_id filter maps to item_id for backward compatibility."""
        filters = {"card_id": "card-123"}
        item_id = filters.get("card_id")
        assert item_id == "card-123"

    def test_item_id_preferred(self):
        filters = {"item_id": "item-123", "card_id": "card-123"}
        item_id = filters.get("item_id")
        assert item_id == "item-123"
