"""
Deep behavioral tests for user session management patterns.
Tests session storage, activity tracking, credential management,
and cleanup logic patterns.
"""

from datetime import datetime, timezone, timedelta
import threading


# --- User session structure ---


class TestUserSessionStructure:
    """Tests for user session data structure."""

    def _create_session(self, user_id):
        return {
            "user_id": user_id,
            "last_activity": datetime.now(timezone.utc),
            "scheduled_jobs": set(),
        }

    def test_has_user_id(self):
        session = self._create_session("user1")
        assert session["user_id"] == "user1"

    def test_no_password_in_session(self):
        session = self._create_session("user1")
        assert "password" not in session

    def test_has_last_activity(self):
        session = self._create_session("user1")
        assert "last_activity" in session
        assert isinstance(session["last_activity"], datetime)

    def test_has_scheduled_jobs_set(self):
        session = self._create_session("user1")
        assert "scheduled_jobs" in session
        assert isinstance(session["scheduled_jobs"], set)

    def test_jobs_initially_empty(self):
        session = self._create_session("user1")
        assert len(session["scheduled_jobs"]) == 0


# --- Session registration patterns ---


class TestSessionRegistration:
    """Tests for user session registration patterns."""

    def _register_user(self, sessions, credential_store, user_id, password):
        sessions[user_id] = {
            "last_activity": datetime.now(timezone.utc),
            "scheduled_jobs": set(),
        }
        credential_store[user_id] = password
        return True

    def test_adds_new_user(self):
        sessions, creds = {}, {}
        self._register_user(sessions, creds, "user1", "pass")
        assert "user1" in sessions

    def test_stores_password_in_credential_store(self):
        sessions, creds = {}, {}
        self._register_user(sessions, creds, "user1", "mysecret")
        assert "password" not in sessions["user1"]
        assert creds["user1"] == "mysecret"

    def test_sets_initial_activity(self):
        sessions, creds = {}, {}
        before = datetime.now(timezone.utc)
        self._register_user(sessions, creds, "user1", "pass")
        after = datetime.now(timezone.utc)
        assert before <= sessions["user1"]["last_activity"] <= after


class TestSessionUpdate:
    """Tests for session update patterns."""

    def _update_session(
        self, sessions, credential_store, user_id, password=None
    ):
        if user_id not in sessions:
            return False
        sessions[user_id]["last_activity"] = datetime.now(timezone.utc)
        if password:
            credential_store[user_id] = password
        return True

    def test_updates_activity_time(self):
        sessions = {
            "user1": {
                "last_activity": datetime.now(timezone.utc)
                - timedelta(hours=1),
                "scheduled_jobs": set(),
            }
        }
        self._update_session(sessions, {}, "user1")
        assert (
            sessions["user1"]["last_activity"]
            > sessions["user1"]["last_activity"]
            or True
        )
        # Just verify it was updated to a recent time
        assert (
            datetime.now(timezone.utc) - sessions["user1"]["last_activity"]
        ).total_seconds() < 5

    def test_updates_password_in_credential_store(self):
        sessions = {
            "user1": {
                "last_activity": datetime.now(timezone.utc),
                "scheduled_jobs": set(),
            }
        }
        creds = {"user1": "old"}
        self._update_session(sessions, creds, "user1", "newpass")
        assert creds["user1"] == "newpass"
        assert "password" not in sessions["user1"]

    def test_returns_false_for_missing_user(self):
        sessions = {}
        result = self._update_session(sessions, {}, "unknown")
        assert result is False


# --- Session unregistration patterns ---


class TestSessionUnregistration:
    """Tests for user session removal patterns."""

    def _unregister_user(self, sessions, user_id):
        if user_id not in sessions:
            return False
        del sessions[user_id]
        return True

    def test_removes_user(self):
        sessions = {"user1": {}, "user2": {}}
        self._unregister_user(sessions, "user1")
        assert "user1" not in sessions
        assert "user2" in sessions

    def test_returns_false_for_missing(self):
        sessions = {}
        result = self._unregister_user(sessions, "unknown")
        assert result is False


# --- Activity tracking patterns ---


class TestActivityTracking:
    """Tests for user activity tracking patterns."""

    def _is_active(self, sessions, user_id, retention_hours=48):
        if user_id not in sessions:
            return False
        last_activity = sessions[user_id].get("last_activity")
        if not last_activity:
            return False
        cutoff = datetime.now(timezone.utc) - timedelta(hours=retention_hours)
        return last_activity >= cutoff

    def test_recent_activity_is_active(self):
        sessions = {
            "user1": {
                "last_activity": datetime.now(timezone.utc) - timedelta(hours=1)
            }
        }
        assert self._is_active(sessions, "user1") is True

    def test_old_activity_not_active(self):
        sessions = {
            "user1": {
                "last_activity": datetime.now(timezone.utc)
                - timedelta(hours=100)
            }
        }
        assert self._is_active(sessions, "user1") is False

    def test_missing_user_not_active(self):
        sessions = {}
        assert self._is_active(sessions, "unknown") is False

    def test_respects_retention_hours(self):
        sessions = {
            "user1": {
                "last_activity": datetime.now(timezone.utc)
                - timedelta(hours=10)
            }
        }
        assert self._is_active(sessions, "user1", retention_hours=12) is True
        assert self._is_active(sessions, "user1", retention_hours=8) is False


class TestActivityCleanup:
    """Tests for inactive session cleanup patterns."""

    def _cleanup_inactive(self, sessions, retention_hours=48):
        cutoff = datetime.now(timezone.utc) - timedelta(hours=retention_hours)
        inactive_users = [
            user_id
            for user_id, session in sessions.items()
            if session.get("last_activity", cutoff) < cutoff
        ]
        for user_id in inactive_users:
            del sessions[user_id]
        return len(inactive_users)

    def test_removes_inactive_users(self):
        old_time = datetime.now(timezone.utc) - timedelta(hours=100)
        sessions = {
            "active": {"last_activity": datetime.now(timezone.utc)},
            "inactive": {"last_activity": old_time},
        }
        count = self._cleanup_inactive(sessions)
        assert count == 1
        assert "inactive" not in sessions
        assert "active" in sessions

    def test_returns_count(self):
        old_time = datetime.now(timezone.utc) - timedelta(hours=100)
        sessions = {f"user{i}": {"last_activity": old_time} for i in range(5)}
        count = self._cleanup_inactive(sessions)
        assert count == 5

    def test_keeps_all_active(self):
        sessions = {
            "user1": {"last_activity": datetime.now(timezone.utc)},
            "user2": {"last_activity": datetime.now(timezone.utc)},
        }
        count = self._cleanup_inactive(sessions)
        assert count == 0
        assert len(sessions) == 2


# --- Job tracking patterns ---


class TestJobTracking:
    """Tests for scheduled job tracking patterns."""

    def _add_job(self, sessions, user_id, job_id):
        if user_id not in sessions:
            return False
        sessions[user_id]["scheduled_jobs"].add(job_id)
        return True

    def _remove_job(self, sessions, user_id, job_id):
        if user_id not in sessions:
            return False
        sessions[user_id]["scheduled_jobs"].discard(job_id)
        return True

    def _get_jobs(self, sessions, user_id):
        if user_id not in sessions:
            return set()
        return sessions[user_id].get("scheduled_jobs", set())

    def test_add_job(self):
        sessions = {"user1": {"scheduled_jobs": set()}}
        self._add_job(sessions, "user1", "job-123")
        assert "job-123" in sessions["user1"]["scheduled_jobs"]

    def test_add_multiple_jobs(self):
        sessions = {"user1": {"scheduled_jobs": set()}}
        self._add_job(sessions, "user1", "job-1")
        self._add_job(sessions, "user1", "job-2")
        assert len(sessions["user1"]["scheduled_jobs"]) == 2

    def test_remove_job(self):
        sessions = {"user1": {"scheduled_jobs": {"job-1", "job-2"}}}
        self._remove_job(sessions, "user1", "job-1")
        assert "job-1" not in sessions["user1"]["scheduled_jobs"]
        assert "job-2" in sessions["user1"]["scheduled_jobs"]

    def test_get_jobs(self):
        sessions = {"user1": {"scheduled_jobs": {"a", "b", "c"}}}
        jobs = self._get_jobs(sessions, "user1")
        assert len(jobs) == 3

    def test_get_jobs_unknown_user(self):
        sessions = {}
        jobs = self._get_jobs(sessions, "unknown")
        assert jobs == set()


class TestJobCountAggregation:
    """Tests for job count aggregation patterns."""

    def _total_jobs(self, sessions):
        return sum(
            len(session.get("scheduled_jobs", set()))
            for session in sessions.values()
        )

    def test_counts_all_jobs(self):
        sessions = {
            "u1": {"scheduled_jobs": {"j1", "j2"}},
            "u2": {"scheduled_jobs": {"j3"}},
        }
        total = self._total_jobs(sessions)
        assert total == 3

    def test_empty_sessions(self):
        sessions = {}
        total = self._total_jobs(sessions)
        assert total == 0

    def test_users_with_no_jobs(self):
        sessions = {
            "u1": {"scheduled_jobs": set()},
            "u2": {"scheduled_jobs": set()},
        }
        total = self._total_jobs(sessions)
        assert total == 0


# --- Thread safety patterns ---


class TestThreadSafetyPatterns:
    """Tests for thread-safe access patterns."""

    def test_lock_context_manager(self):
        lock = threading.Lock()
        with lock:
            # Critical section
            value = 42
        assert value == 42

    def test_lock_acquire_release(self):
        lock = threading.Lock()
        acquired = lock.acquire()
        assert acquired is True
        lock.release()

    def test_copy_before_iteration(self):
        sessions = {"u1": {}, "u2": {}, "u3": {}}
        # Copy keys before iterating to avoid modification during iteration
        user_ids = list(sessions.keys())
        for user_id in user_ids:
            pass
        assert len(user_ids) == 3


# --- Password management patterns ---


class TestCredentialManagement:
    """Tests for credential store patterns (passwords stored separately)."""

    def _has_credential(self, credential_store, user_id):
        return bool(credential_store.get(user_id))

    def _get_credential(self, credential_store, user_id):
        return credential_store.get(user_id)

    def test_has_credential_true(self):
        creds = {"user1": "secret"}
        assert self._has_credential(creds, "user1") is True

    def test_has_credential_false_empty(self):
        creds = {"user1": ""}
        assert self._has_credential(creds, "user1") is False

    def test_has_credential_false_missing(self):
        creds = {}
        assert self._has_credential(creds, "user1") is False

    def test_get_credential(self):
        creds = {"user1": "secret"}
        assert self._get_credential(creds, "user1") == "secret"

    def test_get_credential_missing_user(self):
        creds = {}
        assert self._get_credential(creds, "unknown") is None


# --- Session info formatting patterns ---


class TestSessionInfoFormatting:
    """Tests for session info formatting patterns."""

    def _format_session_info(self, session, has_credential=False):
        return {
            "has_password": has_credential,
            "last_activity": session.get("last_activity").isoformat()
            if session.get("last_activity")
            else None,
            "scheduled_jobs_count": len(session.get("scheduled_jobs", set())),
        }

    def test_has_password_true(self):
        session = {"scheduled_jobs": set()}
        info = self._format_session_info(session, has_credential=True)
        assert info["has_password"] is True

    def test_has_password_false(self):
        session = {"scheduled_jobs": set()}
        info = self._format_session_info(session, has_credential=False)
        assert info["has_password"] is False

    def test_formats_last_activity(self):
        session = {
            "last_activity": datetime(
                2025, 6, 15, 12, 0, 0, tzinfo=timezone.utc
            ),
            "scheduled_jobs": set(),
        }
        info = self._format_session_info(session)
        assert "2025-06-15" in info["last_activity"]

    def test_counts_jobs(self):
        session = {"scheduled_jobs": {"j1", "j2", "j3"}}
        info = self._format_session_info(session)
        assert info["scheduled_jobs_count"] == 3


# --- Active user count patterns ---


class TestActiveUserCount:
    """Tests for active user counting patterns."""

    def _count_active_users(self, sessions, retention_hours=48):
        cutoff = datetime.now(timezone.utc) - timedelta(hours=retention_hours)
        return sum(
            1
            for session in sessions.values()
            if session.get("last_activity", cutoff) >= cutoff
        )

    def test_counts_active_only(self):
        now = datetime.now(timezone.utc)
        old = now - timedelta(hours=100)
        sessions = {
            "active1": {"last_activity": now},
            "active2": {"last_activity": now},
            "inactive": {"last_activity": old},
        }
        count = self._count_active_users(sessions)
        assert count == 2

    def test_all_active(self):
        now = datetime.now(timezone.utc)
        sessions = {f"u{i}": {"last_activity": now} for i in range(5)}
        count = self._count_active_users(sessions)
        assert count == 5

    def test_none_active(self):
        old = datetime.now(timezone.utc) - timedelta(hours=100)
        sessions = {f"u{i}": {"last_activity": old} for i in range(5)}
        count = self._count_active_users(sessions)
        assert count == 0


# --- Session existence patterns ---


class TestSessionExistence:
    """Tests for session existence check patterns."""

    def _has_session(self, sessions, user_id):
        return user_id in sessions

    def _get_or_create_session(
        self, sessions, credential_store, user_id, password
    ):
        if user_id not in sessions:
            sessions[user_id] = {
                "last_activity": datetime.now(timezone.utc),
                "scheduled_jobs": set(),
            }
            credential_store[user_id] = password
            return sessions[user_id], True  # Created
        return sessions[user_id], False  # Existed

    def test_has_session_true(self):
        sessions = {"user1": {}}
        assert self._has_session(sessions, "user1") is True

    def test_has_session_false(self):
        sessions = {}
        assert self._has_session(sessions, "user1") is False

    def test_get_or_create_new(self):
        sessions, creds = {}, {}
        session, created = self._get_or_create_session(
            sessions, creds, "user1", "pass"
        )
        assert created is True
        assert "user1" in sessions
        assert "password" not in session
        assert creds["user1"] == "pass"

    def test_get_or_create_existing(self):
        sessions = {"user1": {"scheduled_jobs": set()}}
        creds = {"user1": "old"}
        session, created = self._get_or_create_session(
            sessions, creds, "user1", "new"
        )
        assert created is False
        # Credential not updated for existing session
        assert creds["user1"] == "old"


# --- Retention policy patterns ---


class TestRetentionPolicy:
    """Tests for session retention policy patterns."""

    def test_default_retention_48_hours(self):
        retention_hours = 48
        assert retention_hours == 48

    def test_custom_retention(self):
        retention_hours = 24
        cutoff = datetime.now(timezone.utc) - timedelta(hours=retention_hours)
        assert cutoff < datetime.now(timezone.utc)

    def test_retention_zero_means_immediate_cleanup(self):
        retention_hours = 0
        cutoff = datetime.now(timezone.utc) - timedelta(hours=retention_hours)
        now = datetime.now(timezone.utc)
        # With 0 retention, only exact now would pass
        assert abs((now - cutoff).total_seconds()) < 1


# --- Session clearing patterns ---


class TestSessionClearing:
    """Tests for session clearing patterns."""

    def _clear_all_sessions(self, sessions):
        count = len(sessions)
        sessions.clear()
        return count

    def _clear_user_jobs(self, sessions, user_id):
        if user_id not in sessions:
            return 0
        count = len(sessions[user_id].get("scheduled_jobs", set()))
        sessions[user_id]["scheduled_jobs"] = set()
        return count

    def test_clear_all(self):
        sessions = {"u1": {}, "u2": {}, "u3": {}}
        count = self._clear_all_sessions(sessions)
        assert count == 3
        assert len(sessions) == 0

    def test_clear_user_jobs(self):
        sessions = {"u1": {"scheduled_jobs": {"j1", "j2", "j3"}}}
        count = self._clear_user_jobs(sessions, "u1")
        assert count == 3
        assert len(sessions["u1"]["scheduled_jobs"]) == 0

    def test_clear_jobs_unknown_user(self):
        sessions = {}
        count = self._clear_user_jobs(sessions, "unknown")
        assert count == 0
