"""
Deep behavioral tests for subscription scheduling patterns.
Tests jitter calculation, trigger selection, next run calculation,
overdue detection, and scheduling lifecycle patterns.
"""

from datetime import datetime, timezone, timedelta
import random


# --- Jitter calculation patterns ---


class TestJitterCalculation:
    """Tests for jitter calculation patterns."""

    def _calculate_jitter(self, max_jitter_seconds=300):
        """Calculate random jitter within bounds."""
        return random.randint(0, max_jitter_seconds)

    def test_jitter_within_bounds(self):
        max_jitter = 300
        for _ in range(100):
            jitter = self._calculate_jitter(max_jitter)
            assert 0 <= jitter <= max_jitter

    def test_zero_max_jitter(self):
        jitter = self._calculate_jitter(0)
        assert jitter == 0

    def test_jitter_not_always_same(self):
        jitters = [self._calculate_jitter(300) for _ in range(10)]
        # With 300 possible values, very unlikely all same
        assert len(set(jitters)) > 1


class TestJitterApplication:
    """Tests for applying jitter to intervals."""

    def _apply_jitter(self, base_seconds, jitter):
        """Apply jitter to base interval."""
        return base_seconds + jitter

    def test_adds_jitter(self):
        result = self._apply_jitter(3600, 120)
        assert result == 3720

    def test_zero_jitter(self):
        result = self._apply_jitter(3600, 0)
        assert result == 3600

    def test_jitter_spreads_load(self):
        base = 3600
        intervals = [
            self._apply_jitter(base, random.randint(0, 300)) for _ in range(5)
        ]
        # All intervals should be different due to jitter
        assert min(intervals) >= base
        assert max(intervals) <= base + 300


# --- Trigger type selection patterns ---


class TestTriggerTypeSelection:
    """Tests for APScheduler trigger type selection."""

    def _select_trigger_type(self, interval_minutes):
        """Select appropriate trigger type based on interval."""
        if interval_minutes <= 60:
            return "interval"  # For frequent checks
        return "date"  # For infrequent checks

    def test_hourly_uses_interval(self):
        trigger = self._select_trigger_type(60)
        assert trigger == "interval"

    def test_sub_hourly_uses_interval(self):
        trigger = self._select_trigger_type(15)
        assert trigger == "interval"

    def test_over_hour_uses_date(self):
        trigger = self._select_trigger_type(120)
        assert trigger == "date"

    def test_daily_uses_date(self):
        trigger = self._select_trigger_type(1440)  # 24 hours
        assert trigger == "date"


class TestIntervalTriggerConfig:
    """Tests for interval trigger configuration."""

    def _build_interval_config(self, minutes, jitter_seconds=0):
        return {
            "trigger": "interval",
            "minutes": minutes,
            "jitter": jitter_seconds,
        }

    def test_has_trigger_type(self):
        config = self._build_interval_config(30)
        assert config["trigger"] == "interval"

    def test_has_minutes(self):
        config = self._build_interval_config(30)
        assert config["minutes"] == 30

    def test_has_jitter(self):
        config = self._build_interval_config(30, jitter_seconds=60)
        assert config["jitter"] == 60


class TestDateTriggerConfig:
    """Tests for date trigger configuration."""

    def _build_date_config(self, run_date):
        return {
            "trigger": "date",
            "run_date": run_date,
        }

    def test_has_trigger_type(self):
        config = self._build_date_config(datetime.now(timezone.utc))
        assert config["trigger"] == "date"

    def test_has_run_date(self):
        run_date = datetime(2025, 6, 15, 12, 0, 0, tzinfo=timezone.utc)
        config = self._build_date_config(run_date)
        assert config["run_date"] == run_date


# --- Next run calculation patterns ---


class TestNextRunCalculation:
    """Tests for next run time calculation."""

    def _calculate_next_run(self, interval_minutes, jitter_seconds=0):
        """Calculate next run time from now."""
        now = datetime.now(timezone.utc)
        base_delta = timedelta(minutes=interval_minutes)
        jitter_delta = timedelta(seconds=jitter_seconds)
        return now + base_delta + jitter_delta

    def test_next_run_in_future(self):
        next_run = self._calculate_next_run(60)
        now = datetime.now(timezone.utc)
        assert next_run > now

    def test_interval_respected(self):
        interval = 30
        next_run = self._calculate_next_run(interval)
        now = datetime.now(timezone.utc)
        delta = (next_run - now).total_seconds()
        assert abs(delta - 30 * 60) < 1

    def test_jitter_added(self):
        next_run = self._calculate_next_run(60, jitter_seconds=120)
        now = datetime.now(timezone.utc)
        delta = (next_run - now).total_seconds()
        assert delta >= 60 * 60  # At least interval
        assert (
            delta <= 60 * 60 + 120 + 1
        )  # At most interval + jitter + tolerance


class TestNextRunFromLastRefresh:
    """Tests for calculating next run from last refresh."""

    def _calculate_next_from_last(self, last_refresh, interval_minutes):
        """Calculate next run based on last refresh time."""
        if not last_refresh:
            return datetime.now(timezone.utc)
        return last_refresh + timedelta(minutes=interval_minutes)

    def test_from_last_refresh(self):
        last = datetime(2025, 6, 15, 12, 0, 0, tzinfo=timezone.utc)
        next_run = self._calculate_next_from_last(last, 60)
        assert next_run.hour == 13  # 1 hour later

    def test_no_last_refresh_uses_now(self):
        before = datetime.now(timezone.utc)
        next_run = self._calculate_next_from_last(None, 60)
        after = datetime.now(timezone.utc)
        assert before <= next_run <= after


# --- Overdue detection patterns ---


class TestOverdueDetection:
    """Tests for overdue subscription detection."""

    def _is_overdue(self, next_refresh):
        """Check if subscription is overdue."""
        if not next_refresh:
            return True
        now = datetime.now(timezone.utc)
        return next_refresh <= now

    def test_past_is_overdue(self):
        past = datetime.now(timezone.utc) - timedelta(hours=1)
        assert self._is_overdue(past) is True

    def test_future_not_overdue(self):
        future = datetime.now(timezone.utc) + timedelta(hours=1)
        assert self._is_overdue(future) is False

    def test_no_next_refresh_is_overdue(self):
        assert self._is_overdue(None) is True

    def test_exactly_now_is_overdue(self):
        # For boundary, exactly now is considered overdue
        now = datetime.now(timezone.utc)
        assert self._is_overdue(now) is True


class TestOverdueHandling:
    """Tests for handling overdue subscriptions."""

    def _schedule_overdue_immediately(self, subscription):
        """Schedule overdue subscription to run immediately."""
        run_time = datetime.now(timezone.utc) + timedelta(seconds=5)
        return {
            "subscription_id": subscription["id"],
            "run_time": run_time,
            "is_immediate": True,
        }

    def test_scheduled_immediately(self):
        sub = {"id": "sub-123"}
        scheduled = self._schedule_overdue_immediately(sub)
        now = datetime.now(timezone.utc)
        assert scheduled["run_time"] > now
        assert (scheduled["run_time"] - now).total_seconds() < 10

    def test_marked_as_immediate(self):
        sub = {"id": "sub-123"}
        scheduled = self._schedule_overdue_immediately(sub)
        assert scheduled["is_immediate"] is True


# --- Job ID patterns ---


class TestJobIdGeneration:
    """Tests for job ID generation patterns."""

    def _generate_job_id(self, subscription_id, user_id):
        """Generate unique job ID."""
        return f"check_sub_{user_id}_{subscription_id}"

    def test_includes_subscription_id(self):
        job_id = self._generate_job_id("sub-123", "user1")
        assert "sub-123" in job_id

    def test_includes_user_id(self):
        job_id = self._generate_job_id("sub-123", "user1")
        assert "user1" in job_id

    def test_has_prefix(self):
        job_id = self._generate_job_id("sub-123", "user1")
        assert job_id.startswith("check_sub_")

    def test_unique_for_different_subscriptions(self):
        job1 = self._generate_job_id("sub-1", "user1")
        job2 = self._generate_job_id("sub-2", "user1")
        assert job1 != job2


class TestDocumentProcessingJobId:
    """Tests for document processing job ID patterns."""

    def _generate_doc_job_id(self, user_id):
        """Generate document processing job ID."""
        return f"doc_process_{user_id}"

    def test_includes_user_id(self):
        job_id = self._generate_doc_job_id("user123")
        assert "user123" in job_id

    def test_has_prefix(self):
        job_id = self._generate_doc_job_id("user1")
        assert job_id.startswith("doc_process_")


# --- Subscription batch patterns ---


class TestSubscriptionBatching:
    """Tests for subscription batch processing."""

    def _batch_subscriptions(self, subscriptions, batch_size=5):
        """Split subscriptions into batches."""
        batches = []
        for i in range(0, len(subscriptions), batch_size):
            batches.append(subscriptions[i : i + batch_size])
        return batches

    def test_single_batch(self):
        subs = [{"id": str(i)} for i in range(3)]
        batches = self._batch_subscriptions(subs, batch_size=5)
        assert len(batches) == 1
        assert len(batches[0]) == 3

    def test_multiple_batches(self):
        subs = [{"id": str(i)} for i in range(12)]
        batches = self._batch_subscriptions(subs, batch_size=5)
        assert len(batches) == 3
        assert len(batches[0]) == 5
        assert len(batches[1]) == 5
        assert len(batches[2]) == 2

    def test_empty_list(self):
        batches = self._batch_subscriptions([], batch_size=5)
        assert batches == []


# --- Schedule clearing patterns ---


class TestScheduleClearing:
    """Tests for clearing scheduled jobs."""

    def _clear_user_jobs(self, scheduled_jobs, user_id):
        """Clear all jobs for a user."""
        user_jobs = [j for j in scheduled_jobs if j.get("user_id") == user_id]
        for job in user_jobs:
            scheduled_jobs.remove(job)
        return len(user_jobs)

    def test_removes_user_jobs(self):
        jobs = [
            {"id": "j1", "user_id": "u1"},
            {"id": "j2", "user_id": "u2"},
            {"id": "j3", "user_id": "u1"},
        ]
        count = self._clear_user_jobs(jobs, "u1")
        assert count == 2
        assert len(jobs) == 1
        assert jobs[0]["user_id"] == "u2"

    def test_returns_count(self):
        jobs = [{"id": str(i), "user_id": "u1"} for i in range(5)]
        count = self._clear_user_jobs(jobs, "u1")
        assert count == 5


# --- Scheduler running state patterns ---


class TestSchedulerRunningState:
    """Tests for scheduler running state patterns."""

    def test_initial_not_running(self):
        is_running = False
        assert is_running is False

    def test_start_sets_running(self):
        is_running = False
        is_running = True
        assert is_running is True

    def test_stop_clears_running(self):
        is_running = True
        is_running = False
        assert is_running is False


class TestSchedulerOperationGuards:
    """Tests for scheduler operation guard patterns."""

    def _should_skip_operation(self, is_running, has_session):
        """Check if operation should be skipped."""
        if not is_running:
            return True
        if not has_session:
            return True
        return False

    def test_skip_when_not_running(self):
        assert self._should_skip_operation(False, True) is True

    def test_skip_when_no_session(self):
        assert self._should_skip_operation(True, False) is True

    def test_proceed_when_both_true(self):
        assert self._should_skip_operation(True, True) is False


# --- Subscription status checks ---


class TestSubscriptionStatusChecks:
    """Tests for subscription status check patterns."""

    def _should_schedule(self, subscription):
        """Check if subscription should be scheduled."""
        if not subscription.get("is_active", True):
            return False
        if subscription.get("status") in ["paused", "expired"]:
            return False
        return True

    def test_active_should_schedule(self):
        sub = {"is_active": True, "status": "active"}
        assert self._should_schedule(sub) is True

    def test_paused_not_scheduled(self):
        sub = {"is_active": True, "status": "paused"}
        assert self._should_schedule(sub) is False

    def test_expired_not_scheduled(self):
        sub = {"is_active": True, "status": "expired"}
        assert self._should_schedule(sub) is False

    def test_inactive_not_scheduled(self):
        sub = {"is_active": False, "status": "active"}
        assert self._should_schedule(sub) is False


# --- Date placeholder replacement ---


class TestDatePlaceholderReplacement:
    """Tests for date placeholder replacement in queries."""

    def _replace_date_placeholder(self, query):
        """Replace YYYY-MM-DD with current date."""
        today = datetime.now(timezone.utc).strftime("%Y-%m-%d")
        return query.replace("YYYY-MM-DD", today)

    def test_replaces_placeholder(self):
        query = "news for YYYY-MM-DD"
        result = self._replace_date_placeholder(query)
        assert "YYYY-MM-DD" not in result
        assert datetime.now(timezone.utc).strftime("%Y") in result

    def test_no_placeholder(self):
        query = "AI news today"
        result = self._replace_date_placeholder(query)
        assert result == "AI news today"

    def test_multiple_placeholders(self):
        query = "news YYYY-MM-DD and also YYYY-MM-DD"
        result = self._replace_date_placeholder(query)
        assert result.count("YYYY-MM-DD") == 0


# --- Max instances configuration ---


class TestMaxInstancesConfig:
    """Tests for max instances configuration."""

    def _build_job_config(self, max_instances=1):
        return {
            "max_instances": max_instances,
            "coalesce": True,
            "misfire_grace_time": 60,
        }

    def test_default_max_instances_1(self):
        config = self._build_job_config()
        assert config["max_instances"] == 1

    def test_coalesce_enabled(self):
        config = self._build_job_config()
        assert config["coalesce"] is True

    def test_misfire_grace_time(self):
        config = self._build_job_config()
        assert config["misfire_grace_time"] == 60


# --- Job verification patterns ---


class TestJobVerification:
    """Tests for job verification after scheduling."""

    def _verify_job_scheduled(self, scheduled_jobs, job_id):
        """Verify a job was successfully scheduled."""
        return job_id in scheduled_jobs

    def test_job_found(self):
        jobs = {"job-1", "job-2", "job-3"}
        assert self._verify_job_scheduled(jobs, "job-2") is True

    def test_job_not_found(self):
        jobs = {"job-1", "job-2"}
        assert self._verify_job_scheduled(jobs, "job-3") is False


# --- Error recovery patterns ---


class TestSchedulingErrorRecovery:
    """Tests for scheduling error recovery patterns."""

    def _handle_job_lookup_error(self, job_id, scheduled_jobs):
        """Handle JobLookupError by removing from tracked jobs."""
        scheduled_jobs.discard(job_id)
        return True

    def test_removes_from_tracked(self):
        jobs = {"job-1", "job-2", "job-3"}
        self._handle_job_lookup_error("job-2", jobs)
        assert "job-2" not in jobs
        assert len(jobs) == 2

    def test_handles_already_missing(self):
        jobs = {"job-1"}
        result = self._handle_job_lookup_error("job-2", jobs)
        assert result is True  # No error


# --- Rescheduling patterns ---


class TestReschedulingPatterns:
    """Tests for subscription rescheduling."""

    def _reschedule_subscription(self, subscription, new_interval_minutes):
        """Reschedule a subscription with new interval."""
        now = datetime.now(timezone.utc)
        subscription["refresh_interval_minutes"] = new_interval_minutes
        subscription["next_refresh"] = now + timedelta(
            minutes=new_interval_minutes
        )
        return subscription

    def test_updates_interval(self):
        sub = {"id": "1", "refresh_interval_minutes": 60}
        result = self._reschedule_subscription(sub, 120)
        assert result["refresh_interval_minutes"] == 120

    def test_updates_next_refresh(self):
        sub = {"id": "1", "refresh_interval_minutes": 60}
        before = datetime.now(timezone.utc)
        result = self._reschedule_subscription(sub, 120)
        expected = before + timedelta(minutes=120)
        diff = abs((result["next_refresh"] - expected).total_seconds())
        assert diff < 1  # Within 1 second
