"""
Deep behavioral tests for data transformation patterns.
Tests card serialization, deserialization, normalization,
merging, and format conversion logic.
"""

from datetime import datetime, timezone
import json


# --- Card serialization patterns ---


class TestCardSerialization:
    """Tests for card to dict serialization."""

    def _serialize_card(self, card):
        """Serialize card to dict."""
        return {
            "id": card.get("id"),
            "card_type": card.get("card_type", "news"),
            "headline": card.get("headline", ""),
            "summary": card.get("summary", ""),
            "impact_score": card.get("impact_score", 5),
            "category": card.get("category", "General"),
            "topics": card.get("topics", []),
            "created_at": card.get("created_at").isoformat()
            if card.get("created_at")
            else None,
        }

    def test_preserves_id(self):
        card = {"id": "card-123"}
        result = self._serialize_card(card)
        assert result["id"] == "card-123"

    def test_defaults_card_type(self):
        card = {"id": "1"}
        result = self._serialize_card(card)
        assert result["card_type"] == "news"

    def test_formats_datetime(self):
        card = {
            "id": "1",
            "created_at": datetime(2025, 6, 15, tzinfo=timezone.utc),
        }
        result = self._serialize_card(card)
        assert "2025-06-15" in result["created_at"]

    def test_empty_topics(self):
        card = {"id": "1"}
        result = self._serialize_card(card)
        assert result["topics"] == []


# --- Card deserialization patterns ---


class TestCardDeserialization:
    """Tests for dict to card deserialization."""

    def _deserialize_card(self, data):
        """Deserialize dict to card."""
        card = {
            "id": data.get("id"),
            "card_type": data.get("card_type", "news"),
            "headline": data.get("headline", ""),
            "summary": data.get("summary", ""),
            "impact_score": data.get("impact_score", 5),
            "topics": data.get("topics", []),
        }
        if data.get("created_at"):
            if isinstance(data["created_at"], str):
                card["created_at"] = datetime.fromisoformat(data["created_at"])
            else:
                card["created_at"] = data["created_at"]
        return card

    def test_parses_id(self):
        data = {"id": "card-456"}
        card = self._deserialize_card(data)
        assert card["id"] == "card-456"

    def test_parses_datetime_string(self):
        data = {"id": "1", "created_at": "2025-06-15T12:00:00+00:00"}
        card = self._deserialize_card(data)
        assert isinstance(card["created_at"], datetime)

    def test_preserves_datetime_object(self):
        dt = datetime(2025, 6, 15, tzinfo=timezone.utc)
        data = {"id": "1", "created_at": dt}
        card = self._deserialize_card(data)
        assert card["created_at"] == dt


# --- JSON serialization patterns ---


class TestJSONSerialization:
    """Tests for JSON serialization patterns."""

    def _to_json_safe(self, data):
        """Convert data to JSON-safe dict."""

        def convert(obj):
            if isinstance(obj, datetime):
                return obj.isoformat()
            if isinstance(obj, set):
                return list(obj)
            if isinstance(obj, dict):
                return {k: convert(v) for k, v in obj.items()}
            if isinstance(obj, list):
                return [convert(i) for i in obj]
            return obj

        return convert(data)

    def test_converts_datetime(self):
        data = {"time": datetime(2025, 6, 15, tzinfo=timezone.utc)}
        result = self._to_json_safe(data)
        assert isinstance(result["time"], str)

    def test_converts_set(self):
        data = {"items": {1, 2, 3}}
        result = self._to_json_safe(data)
        assert isinstance(result["items"], list)
        assert len(result["items"]) == 3

    def test_nested_conversion(self):
        data = {"outer": {"inner": datetime(2025, 1, 1, tzinfo=timezone.utc)}}
        result = self._to_json_safe(data)
        assert isinstance(result["outer"]["inner"], str)

    def test_can_serialize_to_json(self):
        data = {"time": datetime(2025, 6, 15, tzinfo=timezone.utc)}
        safe = self._to_json_safe(data)
        json_str = json.dumps(safe)
        assert isinstance(json_str, str)


# --- Data normalization patterns ---


class TestDataNormalization:
    """Tests for data normalization patterns."""

    def _normalize_text(self, text):
        """Normalize text fields."""
        if not text:
            return ""
        return " ".join(text.strip().split())

    def test_trims_whitespace(self):
        result = self._normalize_text("  hello world  ")
        assert result == "hello world"

    def test_collapses_spaces(self):
        result = self._normalize_text("hello    world")
        assert result == "hello world"

    def test_handles_newlines(self):
        result = self._normalize_text("hello\nworld")
        assert result == "hello world"

    def test_handles_none(self):
        result = self._normalize_text(None)
        assert result == ""

    def test_handles_empty(self):
        result = self._normalize_text("")
        assert result == ""


class TestScoreNormalization:
    """Tests for score normalization patterns."""

    def _normalize_score(self, score, min_val=0, max_val=10):
        """Normalize score to range."""
        if score is None:
            return (min_val + max_val) / 2
        return max(min_val, min(max_val, score))

    def test_within_range(self):
        result = self._normalize_score(5)
        assert result == 5

    def test_below_min(self):
        result = self._normalize_score(-5)
        assert result == 0

    def test_above_max(self):
        result = self._normalize_score(15)
        assert result == 10

    def test_none_uses_middle(self):
        result = self._normalize_score(None)
        assert result == 5


# --- Topic normalization patterns ---


class TestTopicNormalization:
    """Tests for topic normalization patterns."""

    def _normalize_topics(self, topics):
        """Normalize topic list."""
        if not topics:
            return []
        normalized = []
        seen = set()
        for topic in topics:
            if not topic:
                continue
            clean = topic.strip().lower()
            if clean and clean not in seen:
                seen.add(clean)
                normalized.append(clean)
        return normalized

    def test_lowercase(self):
        result = self._normalize_topics(["AI", "ML"])
        assert result == ["ai", "ml"]

    def test_removes_duplicates(self):
        result = self._normalize_topics(["AI", "ai", "Ai"])
        assert result == ["ai"]

    def test_strips_whitespace(self):
        result = self._normalize_topics(["  AI  ", "  ML  "])
        assert result == ["ai", "ml"]

    def test_removes_empty(self):
        result = self._normalize_topics(["AI", "", None, "ML"])
        assert result == ["ai", "ml"]


# --- Data merging patterns ---


class TestDataMerging:
    """Tests for data merging patterns."""

    def _merge_dicts(self, base, updates):
        """Merge updates into base dict."""
        result = base.copy()
        for key, value in updates.items():
            if value is not None:
                result[key] = value
        return result

    def test_overwrites_values(self):
        base = {"a": 1, "b": 2}
        updates = {"b": 3}
        result = self._merge_dicts(base, updates)
        assert result["b"] == 3

    def test_preserves_unmodified(self):
        base = {"a": 1, "b": 2}
        updates = {"c": 3}
        result = self._merge_dicts(base, updates)
        assert result["a"] == 1
        assert result["b"] == 2

    def test_skips_none(self):
        base = {"a": 1}
        updates = {"a": None}
        result = self._merge_dicts(base, updates)
        assert result["a"] == 1


class TestDeepMerging:
    """Tests for deep dict merging patterns."""

    def _deep_merge(self, base, updates):
        """Deep merge dicts."""
        result = base.copy()
        for key, value in updates.items():
            if (
                key in result
                and isinstance(result[key], dict)
                and isinstance(value, dict)
            ):
                result[key] = self._deep_merge(result[key], value)
            elif value is not None:
                result[key] = value
        return result

    def test_merges_nested(self):
        base = {"a": {"b": 1, "c": 2}}
        updates = {"a": {"c": 3}}
        result = self._deep_merge(base, updates)
        assert result["a"]["b"] == 1
        assert result["a"]["c"] == 3

    def test_overwrites_non_dict(self):
        base = {"a": 1}
        updates = {"a": {"b": 2}}
        result = self._deep_merge(base, updates)
        assert result["a"] == {"b": 2}


# --- List operations patterns ---


class TestListDeduplication:
    """Tests for list deduplication patterns."""

    def _deduplicate_by_id(self, items):
        """Deduplicate items by ID."""
        seen = set()
        result = []
        for item in items:
            item_id = item.get("id")
            if item_id not in seen:
                seen.add(item_id)
                result.append(item)
        return result

    def test_removes_duplicates(self):
        items = [
            {"id": "1", "name": "A"},
            {"id": "2", "name": "B"},
            {"id": "1", "name": "A copy"},
        ]
        result = self._deduplicate_by_id(items)
        assert len(result) == 2

    def test_keeps_first(self):
        items = [
            {"id": "1", "name": "First"},
            {"id": "1", "name": "Second"},
        ]
        result = self._deduplicate_by_id(items)
        assert result[0]["name"] == "First"


class TestListSorting:
    """Tests for list sorting patterns."""

    def _sort_by_key(self, items, key, reverse=False):
        """Sort items by key."""
        return sorted(items, key=lambda x: x.get(key, 0), reverse=reverse)

    def test_sorts_ascending(self):
        items = [{"score": 3}, {"score": 1}, {"score": 2}]
        result = self._sort_by_key(items, "score")
        assert result[0]["score"] == 1
        assert result[2]["score"] == 3

    def test_sorts_descending(self):
        items = [{"score": 1}, {"score": 3}]
        result = self._sort_by_key(items, "score", reverse=True)
        assert result[0]["score"] == 3


# --- Format conversion patterns ---


class TestDateTimeFormatConversion:
    """Tests for datetime format conversions."""

    def _to_timestamp(self, dt):
        """Convert datetime to Unix timestamp."""
        if not dt:
            return None
        return dt.timestamp()

    def _from_timestamp(self, ts):
        """Convert Unix timestamp to datetime."""
        if not ts:
            return None
        return datetime.fromtimestamp(ts, tz=timezone.utc)

    def test_to_timestamp(self):
        dt = datetime(2025, 6, 15, 12, 0, 0, tzinfo=timezone.utc)
        ts = self._to_timestamp(dt)
        assert isinstance(ts, float)

    def test_from_timestamp(self):
        ts = 1750000000
        dt = self._from_timestamp(ts)
        assert isinstance(dt, datetime)

    def test_roundtrip(self):
        original = datetime(2025, 6, 15, 12, 0, 0, tzinfo=timezone.utc)
        ts = self._to_timestamp(original)
        recovered = self._from_timestamp(ts)
        assert abs((recovered - original).total_seconds()) < 1


class TestIntervalFormatConversion:
    """Tests for interval format conversions."""

    def _minutes_to_seconds(self, minutes):
        """Convert minutes to seconds."""
        return minutes * 60

    def _seconds_to_minutes(self, seconds):
        """Convert seconds to minutes."""
        return seconds // 60

    def _format_interval(self, minutes):
        """Format interval as human-readable."""
        if minutes < 60:
            return f"{minutes} minutes"
        hours = minutes // 60
        remaining = minutes % 60
        if remaining == 0:
            return f"{hours} hour{'s' if hours > 1 else ''}"
        return f"{hours}h {remaining}m"

    def test_minutes_to_seconds(self):
        assert self._minutes_to_seconds(30) == 1800

    def test_seconds_to_minutes(self):
        assert self._seconds_to_minutes(3600) == 60

    def test_format_minutes(self):
        assert self._format_interval(30) == "30 minutes"

    def test_format_hour(self):
        assert self._format_interval(60) == "1 hour"

    def test_format_hours(self):
        assert self._format_interval(120) == "2 hours"

    def test_format_mixed(self):
        assert self._format_interval(90) == "1h 30m"


# --- Metadata extraction patterns ---


class TestMetadataExtraction:
    """Tests for metadata extraction patterns."""

    def _extract_metadata(self, data, keys):
        """Extract specified metadata keys."""
        return {k: data.get(k) for k in keys if k in data}

    def test_extracts_existing(self):
        data = {"a": 1, "b": 2, "c": 3}
        result = self._extract_metadata(data, ["a", "b"])
        assert result == {"a": 1, "b": 2}

    def test_ignores_missing(self):
        data = {"a": 1}
        result = self._extract_metadata(data, ["a", "b"])
        assert result == {"a": 1}

    def test_empty_keys(self):
        data = {"a": 1}
        result = self._extract_metadata(data, [])
        assert result == {}


# --- Field mapping patterns ---


class TestFieldMapping:
    """Tests for field mapping patterns."""

    def _map_fields(self, data, mapping):
        """Map fields from one structure to another."""
        result = {}
        for target, source in mapping.items():
            if source in data:
                result[target] = data[source]
        return result

    def test_renames_fields(self):
        data = {"old_name": "value"}
        mapping = {"new_name": "old_name"}
        result = self._map_fields(data, mapping)
        assert result == {"new_name": "value"}

    def test_multiple_mappings(self):
        data = {"a": 1, "b": 2}
        mapping = {"x": "a", "y": "b"}
        result = self._map_fields(data, mapping)
        assert result == {"x": 1, "y": 2}


# --- Default value patterns ---


class TestDefaultValues:
    """Tests for default value patterns."""

    def _with_defaults(self, data, defaults):
        """Apply defaults to data."""
        result = defaults.copy()
        result.update({k: v for k, v in data.items() if v is not None})
        return result

    def test_applies_defaults(self):
        data = {"a": 1}
        defaults = {"a": 0, "b": 2}
        result = self._with_defaults(data, defaults)
        assert result["a"] == 1
        assert result["b"] == 2

    def test_none_uses_default(self):
        data = {"a": None}
        defaults = {"a": 10}
        result = self._with_defaults(data, defaults)
        assert result["a"] == 10


# --- Safe access patterns ---


class TestSafeAccess:
    """Tests for safe nested access patterns."""

    def _safe_get(self, data, *keys, default=None):
        """Safely get nested value."""
        result = data
        for key in keys:
            if isinstance(result, dict):
                result = result.get(key)
            else:
                return default
            if result is None:
                return default
        return result

    def test_single_key(self):
        data = {"a": 1}
        assert self._safe_get(data, "a") == 1

    def test_nested_keys(self):
        data = {"a": {"b": {"c": 3}}}
        assert self._safe_get(data, "a", "b", "c") == 3

    def test_missing_key(self):
        data = {"a": 1}
        assert self._safe_get(data, "b", default=0) == 0

    def test_missing_nested(self):
        data = {"a": {}}
        assert self._safe_get(data, "a", "b", "c", default="x") == "x"
