"""
Deep behavioral tests for notification patterns.
Tests notification creation, formatting, delivery,
batching, and preference management logic.
"""

from datetime import datetime, timezone, timedelta


# --- Notification creation patterns ---


class TestNotificationCreation:
    """Tests for notification creation patterns."""

    def _create_notification(
        self, user_id, notification_type, content, **kwargs
    ):
        """Create a notification."""
        return {
            "id": kwargs.get(
                "id", f"notif-{user_id}-{datetime.now().timestamp()}"
            ),
            "user_id": user_id,
            "type": notification_type,
            "content": content,
            "created_at": datetime.now(timezone.utc),
            "read": False,
            "dismissed": False,
            **kwargs,
        }

    def test_has_id(self):
        notif = self._create_notification("user1", "news", "New article")
        assert "id" in notif
        assert notif["id"].startswith("notif-")

    def test_has_user_id(self):
        notif = self._create_notification("user1", "news", "New article")
        assert notif["user_id"] == "user1"

    def test_has_type(self):
        notif = self._create_notification("user1", "news", "New article")
        assert notif["type"] == "news"

    def test_has_content(self):
        notif = self._create_notification("user1", "news", "New article")
        assert notif["content"] == "New article"

    def test_created_at_is_now(self):
        before = datetime.now(timezone.utc)
        notif = self._create_notification("user1", "news", "New article")
        after = datetime.now(timezone.utc)
        assert before <= notif["created_at"] <= after

    def test_initially_unread(self):
        notif = self._create_notification("user1", "news", "New article")
        assert notif["read"] is False

    def test_initially_not_dismissed(self):
        notif = self._create_notification("user1", "news", "New article")
        assert notif["dismissed"] is False

    def test_accepts_custom_id(self):
        notif = self._create_notification(
            "user1", "news", "New article", id="custom-123"
        )
        assert notif["id"] == "custom-123"


# --- Notification type patterns ---


class TestNotificationTypes:
    """Tests for notification type handling."""

    def _is_valid_type(self, notification_type):
        """Check if notification type is valid."""
        valid_types = ["news", "subscription", "research", "system", "alert"]
        return notification_type in valid_types

    def test_news_valid(self):
        assert self._is_valid_type("news") is True

    def test_subscription_valid(self):
        assert self._is_valid_type("subscription") is True

    def test_research_valid(self):
        assert self._is_valid_type("research") is True

    def test_system_valid(self):
        assert self._is_valid_type("system") is True

    def test_alert_valid(self):
        assert self._is_valid_type("alert") is True

    def test_invalid_type(self):
        assert self._is_valid_type("unknown") is False


class TestNotificationPriority:
    """Tests for notification priority patterns."""

    def _get_priority(self, notification_type):
        """Get priority for notification type."""
        priorities = {
            "alert": 1,
            "system": 2,
            "research": 3,
            "subscription": 4,
            "news": 5,
        }
        return priorities.get(notification_type, 10)

    def test_alert_highest_priority(self):
        assert self._get_priority("alert") == 1

    def test_system_high_priority(self):
        assert self._get_priority("system") == 2

    def test_news_lowest_priority(self):
        assert self._get_priority("news") == 5

    def test_unknown_type_low_priority(self):
        assert self._get_priority("unknown") == 10

    def test_priority_ordering(self):
        assert self._get_priority("alert") < self._get_priority("system")
        assert self._get_priority("system") < self._get_priority("news")


# --- Notification formatting patterns ---


class TestNotificationFormatting:
    """Tests for notification content formatting."""

    def _format_notification(self, notification):
        """Format notification for display."""
        title = notification.get("title", "Notification")
        content = notification.get("content", "")
        timestamp = notification.get("created_at")
        time_str = timestamp.strftime("%H:%M") if timestamp else ""
        return f"[{time_str}] {title}: {content}"

    def test_includes_time(self):
        notification = {
            "title": "News",
            "content": "Article",
            "created_at": datetime(2025, 6, 15, 14, 30, tzinfo=timezone.utc),
        }
        result = self._format_notification(notification)
        assert "14:30" in result

    def test_includes_title(self):
        notification = {
            "title": "News Alert",
            "content": "Article",
            "created_at": datetime.now(timezone.utc),
        }
        result = self._format_notification(notification)
        assert "News Alert" in result

    def test_includes_content(self):
        notification = {
            "title": "News",
            "content": "Important update",
            "created_at": datetime.now(timezone.utc),
        }
        result = self._format_notification(notification)
        assert "Important update" in result


class TestNotificationTruncation:
    """Tests for notification content truncation."""

    def _truncate(self, content, max_length=100):
        """Truncate content to max length."""
        if not content or len(content) <= max_length:
            return content
        return content[: max_length - 3] + "..."

    def test_short_content_unchanged(self):
        result = self._truncate("Short text", max_length=50)
        assert result == "Short text"

    def test_long_content_truncated(self):
        long_text = "a" * 200
        result = self._truncate(long_text, max_length=100)
        assert len(result) == 100
        assert result.endswith("...")

    def test_exact_length_unchanged(self):
        text = "a" * 100
        result = self._truncate(text, max_length=100)
        assert len(result) == 100
        assert not result.endswith("...")

    def test_none_content(self):
        result = self._truncate(None)
        assert result is None


# --- Read status patterns ---


class TestReadStatusTracking:
    """Tests for notification read status tracking."""

    def _mark_read(self, notification):
        """Mark notification as read."""
        notification["read"] = True
        notification["read_at"] = datetime.now(timezone.utc)
        return notification

    def _mark_unread(self, notification):
        """Mark notification as unread."""
        notification["read"] = False
        notification.pop("read_at", None)
        return notification

    def test_mark_read_sets_flag(self):
        notification = {"read": False}
        result = self._mark_read(notification)
        assert result["read"] is True

    def test_mark_read_sets_timestamp(self):
        notification = {"read": False}
        result = self._mark_read(notification)
        assert "read_at" in result

    def test_mark_unread_clears_flag(self):
        notification = {"read": True, "read_at": datetime.now(timezone.utc)}
        result = self._mark_unread(notification)
        assert result["read"] is False

    def test_mark_unread_removes_timestamp(self):
        notification = {"read": True, "read_at": datetime.now(timezone.utc)}
        result = self._mark_unread(notification)
        assert "read_at" not in result


class TestUnreadCount:
    """Tests for unread notification counting."""

    def _count_unread(self, notifications):
        """Count unread notifications."""
        return sum(1 for n in notifications if not n.get("read", False))

    def test_all_unread(self):
        notifications = [{"read": False}, {"read": False}, {"read": False}]
        assert self._count_unread(notifications) == 3

    def test_all_read(self):
        notifications = [{"read": True}, {"read": True}]
        assert self._count_unread(notifications) == 0

    def test_mixed(self):
        notifications = [{"read": False}, {"read": True}, {"read": False}]
        assert self._count_unread(notifications) == 2

    def test_empty_list(self):
        assert self._count_unread([]) == 0


# --- Dismissal patterns ---


class TestDismissalPatterns:
    """Tests for notification dismissal patterns."""

    def _dismiss(self, notification):
        """Dismiss a notification."""
        notification["dismissed"] = True
        notification["dismissed_at"] = datetime.now(timezone.utc)
        return notification

    def _is_visible(self, notification):
        """Check if notification should be visible."""
        return not notification.get("dismissed", False)

    def test_dismiss_sets_flag(self):
        notification = {"dismissed": False}
        result = self._dismiss(notification)
        assert result["dismissed"] is True

    def test_dismiss_sets_timestamp(self):
        notification = {"dismissed": False}
        result = self._dismiss(notification)
        assert "dismissed_at" in result

    def test_dismissed_not_visible(self):
        notification = {"dismissed": True}
        assert self._is_visible(notification) is False

    def test_not_dismissed_visible(self):
        notification = {"dismissed": False}
        assert self._is_visible(notification) is True


# --- Batch notification patterns ---


class TestBatchNotifications:
    """Tests for batch notification handling."""

    def _batch_notifications(self, notifications, batch_size=10):
        """Split notifications into batches."""
        return [
            notifications[i : i + batch_size]
            for i in range(0, len(notifications), batch_size)
        ]

    def test_single_batch(self):
        notifications = [{"id": i} for i in range(5)]
        batches = self._batch_notifications(notifications, batch_size=10)
        assert len(batches) == 1
        assert len(batches[0]) == 5

    def test_multiple_batches(self):
        notifications = [{"id": i} for i in range(25)]
        batches = self._batch_notifications(notifications, batch_size=10)
        assert len(batches) == 3
        assert len(batches[0]) == 10
        assert len(batches[1]) == 10
        assert len(batches[2]) == 5

    def test_empty_list(self):
        batches = self._batch_notifications([])
        assert len(batches) == 0


class TestNotificationGrouping:
    """Tests for notification grouping patterns."""

    def _group_by_type(self, notifications):
        """Group notifications by type."""
        groups = {}
        for notification in notifications:
            notif_type = notification.get("type", "other")
            if notif_type not in groups:
                groups[notif_type] = []
            groups[notif_type].append(notification)
        return groups

    def test_groups_by_type(self):
        notifications = [
            {"type": "news", "id": 1},
            {"type": "alert", "id": 2},
            {"type": "news", "id": 3},
        ]
        groups = self._group_by_type(notifications)
        assert len(groups["news"]) == 2
        assert len(groups["alert"]) == 1

    def test_handles_missing_type(self):
        notifications = [{"id": 1}, {"type": "news", "id": 2}]
        groups = self._group_by_type(notifications)
        assert "other" in groups
        assert len(groups["other"]) == 1


# --- Notification filtering patterns ---


class TestNotificationFiltering:
    """Tests for notification filtering patterns."""

    def _filter_by_type(self, notifications, notification_type):
        """Filter notifications by type."""
        return [n for n in notifications if n.get("type") == notification_type]

    def _filter_unread(self, notifications):
        """Filter to unread notifications only."""
        return [n for n in notifications if not n.get("read", False)]

    def _filter_recent(self, notifications, hours=24):
        """Filter to recent notifications."""
        cutoff = datetime.now(timezone.utc) - timedelta(hours=hours)
        return [
            n for n in notifications if n.get("created_at", cutoff) >= cutoff
        ]

    def test_filter_by_type(self):
        notifications = [
            {"type": "news"},
            {"type": "alert"},
            {"type": "news"},
        ]
        result = self._filter_by_type(notifications, "news")
        assert len(result) == 2

    def test_filter_unread(self):
        notifications = [
            {"read": False},
            {"read": True},
            {"read": False},
        ]
        result = self._filter_unread(notifications)
        assert len(result) == 2

    def test_filter_recent(self):
        now = datetime.now(timezone.utc)
        old = now - timedelta(hours=48)
        notifications = [
            {"created_at": now},
            {"created_at": old},
            {"created_at": now},
        ]
        result = self._filter_recent(notifications, hours=24)
        assert len(result) == 2


# --- Notification preference patterns ---


class TestNotificationPreferences:
    """Tests for notification preference patterns."""

    def _get_default_preferences(self):
        """Get default notification preferences."""
        return {
            "email_enabled": True,
            "push_enabled": True,
            "types_enabled": [
                "news",
                "subscription",
                "research",
                "system",
                "alert",
            ],
            "quiet_hours_start": None,
            "quiet_hours_end": None,
            "batch_interval_minutes": 15,
        }

    def _should_send(self, preferences, notification_type):
        """Check if notification type should be sent."""
        if not preferences.get("email_enabled") and not preferences.get(
            "push_enabled"
        ):
            return False
        enabled_types = preferences.get("types_enabled", [])
        return notification_type in enabled_types

    def test_default_email_enabled(self):
        prefs = self._get_default_preferences()
        assert prefs["email_enabled"] is True

    def test_default_all_types_enabled(self):
        prefs = self._get_default_preferences()
        assert len(prefs["types_enabled"]) == 5

    def test_should_send_enabled_type(self):
        prefs = {"email_enabled": True, "types_enabled": ["news", "alert"]}
        assert self._should_send(prefs, "news") is True

    def test_should_not_send_disabled_type(self):
        prefs = {"email_enabled": True, "types_enabled": ["news"]}
        assert self._should_send(prefs, "alert") is False

    def test_should_not_send_when_all_disabled(self):
        prefs = {
            "email_enabled": False,
            "push_enabled": False,
            "types_enabled": ["news"],
        }
        assert self._should_send(prefs, "news") is False


class TestQuietHours:
    """Tests for quiet hours patterns."""

    def _is_quiet_hour(self, preferences, current_hour=None):
        """Check if current time is in quiet hours."""
        start = preferences.get("quiet_hours_start")
        end = preferences.get("quiet_hours_end")
        if start is None or end is None:
            return False
        if current_hour is None:
            current_hour = datetime.now(timezone.utc).hour
        if start < end:
            return start <= current_hour < end
        # Wraps around midnight
        return current_hour >= start or current_hour < end

    def test_no_quiet_hours_set(self):
        prefs = {"quiet_hours_start": None, "quiet_hours_end": None}
        assert self._is_quiet_hour(prefs) is False

    def test_within_quiet_hours(self):
        prefs = {"quiet_hours_start": 22, "quiet_hours_end": 7}
        assert self._is_quiet_hour(prefs, current_hour=23) is True
        assert self._is_quiet_hour(prefs, current_hour=3) is True

    def test_outside_quiet_hours(self):
        prefs = {"quiet_hours_start": 22, "quiet_hours_end": 7}
        assert self._is_quiet_hour(prefs, current_hour=12) is False

    def test_daytime_quiet_hours(self):
        prefs = {"quiet_hours_start": 9, "quiet_hours_end": 17}
        assert self._is_quiet_hour(prefs, current_hour=12) is True
        assert self._is_quiet_hour(prefs, current_hour=20) is False


# --- Notification sorting patterns ---


class TestNotificationSorting:
    """Tests for notification sorting patterns."""

    def _sort_by_priority_and_time(self, notifications, get_priority):
        """Sort notifications by priority then time."""
        return sorted(
            notifications,
            key=lambda n: (
                get_priority(n.get("type", "")),
                n.get("created_at"),
            ),
        )

    def _sort_by_time_descending(self, notifications):
        """Sort notifications by time, newest first."""
        return sorted(
            notifications,
            key=lambda n: n.get(
                "created_at", datetime.min.replace(tzinfo=timezone.utc)
            ),
            reverse=True,
        )

    def test_sort_by_time_newest_first(self):
        now = datetime.now(timezone.utc)
        old = now - timedelta(hours=1)
        notifications = [
            {"id": 1, "created_at": old},
            {"id": 2, "created_at": now},
        ]
        result = self._sort_by_time_descending(notifications)
        assert result[0]["id"] == 2

    def test_sort_by_priority(self):
        def get_priority(t):
            return {"alert": 1, "news": 5}.get(t, 10)

        notifications = [
            {"type": "news", "created_at": datetime.now(timezone.utc)},
            {"type": "alert", "created_at": datetime.now(timezone.utc)},
        ]
        result = self._sort_by_priority_and_time(notifications, get_priority)
        assert result[0]["type"] == "alert"


# --- Notification expiry patterns ---


class TestNotificationExpiry:
    """Tests for notification expiry patterns."""

    def _is_expired(self, notification, max_age_days=30):
        """Check if notification has expired."""
        created_at = notification.get("created_at")
        if not created_at:
            return True
        cutoff = datetime.now(timezone.utc) - timedelta(days=max_age_days)
        return created_at < cutoff

    def _filter_non_expired(self, notifications, max_age_days=30):
        """Filter out expired notifications."""
        return [
            n for n in notifications if not self._is_expired(n, max_age_days)
        ]

    def test_recent_not_expired(self):
        notification = {"created_at": datetime.now(timezone.utc)}
        assert self._is_expired(notification) is False

    def test_old_is_expired(self):
        old = datetime.now(timezone.utc) - timedelta(days=60)
        notification = {"created_at": old}
        assert self._is_expired(notification) is True

    def test_no_timestamp_expired(self):
        notification = {}
        assert self._is_expired(notification) is True

    def test_filter_removes_expired(self):
        now = datetime.now(timezone.utc)
        old = now - timedelta(days=60)
        notifications = [
            {"id": 1, "created_at": now},
            {"id": 2, "created_at": old},
        ]
        result = self._filter_non_expired(notifications)
        assert len(result) == 1
        assert result[0]["id"] == 1


# --- Notification deduplication patterns ---


class TestNotificationDeduplication:
    """Tests for notification deduplication patterns."""

    def _is_duplicate(self, notification, existing, time_window_minutes=60):
        """Check if notification is a duplicate of existing."""
        if notification.get("content") != existing.get("content"):
            return False
        if notification.get("type") != existing.get("type"):
            return False
        n_time = notification.get("created_at")
        e_time = existing.get("created_at")
        if n_time and e_time:
            diff = abs((n_time - e_time).total_seconds())
            return diff < time_window_minutes * 60
        return False

    def test_same_content_and_type_is_duplicate(self):
        now = datetime.now(timezone.utc)
        notification = {"content": "Test", "type": "news", "created_at": now}
        existing = {"content": "Test", "type": "news", "created_at": now}
        assert self._is_duplicate(notification, existing) is True

    def test_different_content_not_duplicate(self):
        now = datetime.now(timezone.utc)
        notification = {"content": "Test 1", "type": "news", "created_at": now}
        existing = {"content": "Test 2", "type": "news", "created_at": now}
        assert self._is_duplicate(notification, existing) is False

    def test_different_type_not_duplicate(self):
        now = datetime.now(timezone.utc)
        notification = {"content": "Test", "type": "news", "created_at": now}
        existing = {"content": "Test", "type": "alert", "created_at": now}
        assert self._is_duplicate(notification, existing) is False

    def test_outside_time_window_not_duplicate(self):
        now = datetime.now(timezone.utc)
        old = now - timedelta(hours=2)
        notification = {"content": "Test", "type": "news", "created_at": now}
        existing = {"content": "Test", "type": "news", "created_at": old}
        assert self._is_duplicate(notification, existing) is False
