"""
Deep behavioral tests for scheduler document processing patterns.
Tests DocumentSchedulerSettings, settings caching, document processing
configuration, and RAG indexing patterns.
"""

from dataclasses import dataclass
from datetime import datetime, timezone, timedelta
import threading


# --- DocumentSchedulerSettings dataclass ---


@dataclass(frozen=True)
class DocumentSchedulerSettings:
    """Test version of DocumentSchedulerSettings."""

    enabled: bool = True
    interval_seconds: int = 1800
    download_pdfs: bool = False
    extract_text: bool = True
    generate_rag: bool = False
    last_run: str = ""

    @classmethod
    def defaults(cls):
        return cls()


class TestDocumentSchedulerSettingsDefaults:
    """Tests for DocumentSchedulerSettings default values."""

    def test_enabled_default_true(self):
        settings = DocumentSchedulerSettings()
        assert settings.enabled is True

    def test_interval_default_1800(self):
        settings = DocumentSchedulerSettings()
        assert settings.interval_seconds == 1800

    def test_download_pdfs_default_false(self):
        settings = DocumentSchedulerSettings()
        assert settings.download_pdfs is False

    def test_extract_text_default_true(self):
        settings = DocumentSchedulerSettings()
        assert settings.extract_text is True

    def test_generate_rag_default_false(self):
        settings = DocumentSchedulerSettings()
        assert settings.generate_rag is False

    def test_last_run_default_empty(self):
        settings = DocumentSchedulerSettings()
        assert settings.last_run == ""

    def test_defaults_classmethod(self):
        settings = DocumentSchedulerSettings.defaults()
        assert settings.enabled is True
        assert settings.interval_seconds == 1800


class TestDocumentSchedulerSettingsImmutability:
    """Tests for frozen dataclass immutability."""

    def test_cannot_modify_enabled(self):
        settings = DocumentSchedulerSettings()
        try:
            settings.enabled = False  # type: ignore
            assert False, "Should raise error"
        except AttributeError:
            pass

    def test_cannot_modify_interval(self):
        settings = DocumentSchedulerSettings()
        try:
            settings.interval_seconds = 900  # type: ignore
            assert False, "Should raise error"
        except AttributeError:
            pass

    def test_is_hashable(self):
        settings = DocumentSchedulerSettings()
        # Frozen dataclasses are hashable
        hash_val = hash(settings)
        assert isinstance(hash_val, int)

    def test_equality(self):
        s1 = DocumentSchedulerSettings()
        s2 = DocumentSchedulerSettings()
        assert s1 == s2

    def test_inequality_different_values(self):
        s1 = DocumentSchedulerSettings(enabled=True)
        s2 = DocumentSchedulerSettings(enabled=False)
        assert s1 != s2


class TestDocumentSchedulerSettingsCustom:
    """Tests for custom settings values."""

    def test_custom_enabled(self):
        settings = DocumentSchedulerSettings(enabled=False)
        assert settings.enabled is False

    def test_custom_interval(self):
        settings = DocumentSchedulerSettings(interval_seconds=900)
        assert settings.interval_seconds == 900

    def test_custom_download_pdfs(self):
        settings = DocumentSchedulerSettings(download_pdfs=True)
        assert settings.download_pdfs is True

    def test_custom_generate_rag(self):
        settings = DocumentSchedulerSettings(generate_rag=True)
        assert settings.generate_rag is True

    def test_custom_last_run(self):
        settings = DocumentSchedulerSettings(last_run="2025-06-15T12:00:00")
        assert settings.last_run == "2025-06-15T12:00:00"

    def test_all_custom(self):
        settings = DocumentSchedulerSettings(
            enabled=False,
            interval_seconds=600,
            download_pdfs=True,
            extract_text=False,
            generate_rag=True,
            last_run="2025-01-01",
        )
        assert settings.enabled is False
        assert settings.interval_seconds == 600
        assert settings.download_pdfs is True
        assert settings.extract_text is False
        assert settings.generate_rag is True


# --- Settings cache patterns ---


class TestSettingsCachePattern:
    """Tests for TTL cache pattern for settings."""

    def _get_cached_or_default(self, cache, username, default_factory):
        """Pattern for cached settings retrieval."""
        cached = cache.get(username)
        if cached is not None:
            return cached
        return default_factory()

    def test_returns_cached_value(self):
        cache = {"user1": DocumentSchedulerSettings(enabled=False)}
        result = self._get_cached_or_default(
            cache, "user1", DocumentSchedulerSettings.defaults
        )
        assert result.enabled is False

    def test_returns_default_for_missing(self):
        cache = {}
        result = self._get_cached_or_default(
            cache, "user1", DocumentSchedulerSettings.defaults
        )
        assert result.enabled is True  # Default

    def test_none_in_cache_returns_none(self):
        # None might be stored intentionally (cache hit with None value)
        cache = {"user1": None}
        result = self._get_cached_or_default(
            cache, "user1", DocumentSchedulerSettings.defaults
        )
        # Cache hit with None value should return default since None is not "is not None"
        # Actually the check is "if cached is not None" so None returns default
        assert result.enabled is True  # Returns default when cached is None


class TestSettingsCacheInvalidation:
    """Tests for cache invalidation patterns."""

    def _invalidate_user(self, cache, username):
        """Invalidate cached settings for a user."""
        if username in cache:
            del cache[username]
            return True
        return False

    def _invalidate_all(self, cache):
        """Invalidate all cached settings."""
        count = len(cache)
        cache.clear()
        return count

    def test_invalidate_existing_user(self):
        cache = {"user1": {}, "user2": {}}
        result = self._invalidate_user(cache, "user1")
        assert result is True
        assert "user1" not in cache
        assert "user2" in cache

    def test_invalidate_missing_user(self):
        cache = {"user2": {}}
        result = self._invalidate_user(cache, "user1")
        assert result is False

    def test_invalidate_all_returns_count(self):
        cache = {"u1": {}, "u2": {}, "u3": {}}
        count = self._invalidate_all(cache)
        assert count == 3
        assert len(cache) == 0


class TestSettingsCacheThreadSafety:
    """Tests for thread-safe cache access patterns."""

    def test_lock_acquire_release(self):
        lock = threading.Lock()
        with lock:
            # Critical section
            pass
        # Lock should be released

    def test_lock_reentrant_fails(self):
        lock = threading.Lock()
        lock.acquire()
        # Non-reentrant lock should fail
        result = lock.acquire(blocking=False)
        assert result is False
        lock.release()


# --- Document processing configuration ---


class TestDocumentProcessingConfig:
    """Tests for document processing configuration patterns."""

    def test_should_process_enabled(self):
        settings = DocumentSchedulerSettings(enabled=True)
        should_process = settings.enabled
        assert should_process is True

    def test_should_not_process_disabled(self):
        settings = DocumentSchedulerSettings(enabled=False)
        should_process = settings.enabled
        assert should_process is False

    def test_processing_options(self):
        settings = DocumentSchedulerSettings(
            download_pdfs=True, extract_text=True, generate_rag=True
        )
        options = {
            "download_pdfs": settings.download_pdfs,
            "extract_text": settings.extract_text,
            "generate_rag": settings.generate_rag,
        }
        assert options["download_pdfs"] is True
        assert options["extract_text"] is True
        assert options["generate_rag"] is True


class TestIntervalCalculation:
    """Tests for processing interval calculations."""

    def test_interval_to_timedelta(self):
        interval_seconds = 1800
        delta = timedelta(seconds=interval_seconds)
        assert delta.total_seconds() == 1800

    def test_next_run_calculation(self):
        now = datetime.now(timezone.utc)
        interval_seconds = 900
        next_run = now + timedelta(seconds=interval_seconds)
        assert next_run > now
        assert (next_run - now).total_seconds() == 900

    def test_interval_with_jitter(self):
        base_interval = 1800
        max_jitter = 300
        # Jitter should be between 0 and max_jitter
        import random

        jitter = random.randint(0, max_jitter)
        total = base_interval + jitter
        assert base_interval <= total <= base_interval + max_jitter


# --- Last run tracking ---


class TestLastRunTracking:
    """Tests for last run timestamp tracking."""

    def test_format_last_run_iso(self):
        now = datetime.now(timezone.utc)
        last_run = now.isoformat()
        assert "T" in last_run

    def test_parse_last_run_iso(self):
        last_run = "2025-06-15T12:30:00+00:00"
        parsed = datetime.fromisoformat(last_run)
        assert parsed.hour == 12
        assert parsed.minute == 30

    def test_check_if_should_run(self):
        last_run = datetime.now(timezone.utc) - timedelta(hours=2)
        interval_seconds = 3600  # 1 hour
        next_due = last_run + timedelta(seconds=interval_seconds)
        now = datetime.now(timezone.utc)
        should_run = next_due <= now
        assert should_run is True

    def test_not_due_yet(self):
        last_run = datetime.now(timezone.utc) - timedelta(minutes=30)
        interval_seconds = 3600  # 1 hour
        next_due = last_run + timedelta(seconds=interval_seconds)
        now = datetime.now(timezone.utc)
        should_run = next_due <= now
        assert should_run is False


# --- Document collection patterns ---


class TestDocumentCollectionPatterns:
    """Tests for document collection handling."""

    def test_collection_has_documents(self):
        collection = {"id": "col1", "documents": [{"id": "d1"}, {"id": "d2"}]}
        has_docs = bool(collection.get("documents"))
        assert has_docs is True

    def test_empty_collection(self):
        collection = {"id": "col1", "documents": []}
        has_docs = bool(collection.get("documents"))
        assert has_docs is False

    def test_filter_unprocessed_documents(self):
        docs = [
            {"id": "d1", "processed": True},
            {"id": "d2", "processed": False},
            {"id": "d3", "processed": False},
        ]
        unprocessed = [d for d in docs if not d.get("processed", False)]
        assert len(unprocessed) == 2

    def test_mark_document_processed(self):
        doc = {"id": "d1", "processed": False}
        doc["processed"] = True
        doc["processed_at"] = datetime.now(timezone.utc).isoformat()
        assert doc["processed"] is True


# --- RAG indexing patterns ---


class TestRAGIndexingPatterns:
    """Tests for RAG indexing configuration patterns."""

    def test_should_index_check(self):
        settings = DocumentSchedulerSettings(generate_rag=True)
        should_index = settings.generate_rag
        assert should_index is True

    def test_skip_rag_when_disabled(self):
        settings = DocumentSchedulerSettings(generate_rag=False)
        should_index = settings.generate_rag
        assert should_index is False

    def test_index_only_with_text(self):
        doc = {"id": "d1", "text_content": "Some text"}
        has_text = bool(doc.get("text_content"))
        assert has_text is True

    def test_skip_empty_text(self):
        doc = {"id": "d1", "text_content": ""}
        has_text = bool(doc.get("text_content"))
        assert has_text is False


# --- PDF download patterns ---


class TestPDFDownloadPatterns:
    """Tests for PDF download configuration."""

    def test_should_download_check(self):
        settings = DocumentSchedulerSettings(download_pdfs=True)
        should_download = settings.download_pdfs
        assert should_download is True

    def test_skip_download_when_disabled(self):
        settings = DocumentSchedulerSettings(download_pdfs=False)
        should_download = settings.download_pdfs
        assert should_download is False

    def test_document_has_url(self):
        doc = {"id": "d1", "url": "https://example.com/doc.pdf"}
        has_url = bool(doc.get("url"))
        assert has_url is True

    def test_is_pdf_url(self):
        url = "https://example.com/document.pdf"
        is_pdf = url.lower().endswith(".pdf")
        assert is_pdf is True

    def test_not_pdf_url(self):
        url = "https://example.com/page.html"
        is_pdf = url.lower().endswith(".pdf")
        assert is_pdf is False


# --- Text extraction patterns ---


class TestTextExtractionPatterns:
    """Tests for text extraction configuration."""

    def test_should_extract_check(self):
        settings = DocumentSchedulerSettings(extract_text=True)
        should_extract = settings.extract_text
        assert should_extract is True

    def test_skip_extract_when_disabled(self):
        settings = DocumentSchedulerSettings(extract_text=False)
        should_extract = settings.extract_text
        assert should_extract is False

    def test_already_has_text(self):
        doc = {"id": "d1", "text_content": "Existing text"}
        needs_extraction = not doc.get("text_content")
        assert needs_extraction is False

    def test_needs_extraction(self):
        doc = {"id": "d1"}
        needs_extraction = not doc.get("text_content")
        assert needs_extraction is True


# --- Scheduler status patterns ---


class TestDocumentSchedulerStatus:
    """Tests for scheduler status patterns."""

    def _build_status(self, settings, is_running, last_run, next_run):
        return {
            "enabled": settings.enabled,
            "is_running": is_running,
            "last_run": last_run,
            "next_run": next_run,
            "interval_seconds": settings.interval_seconds,
            "processing_options": {
                "download_pdfs": settings.download_pdfs,
                "extract_text": settings.extract_text,
                "generate_rag": settings.generate_rag,
            },
        }

    def test_status_includes_enabled(self):
        settings = DocumentSchedulerSettings(enabled=True)
        status = self._build_status(settings, True, None, None)
        assert status["enabled"] is True

    def test_status_includes_running(self):
        settings = DocumentSchedulerSettings()
        status = self._build_status(settings, True, None, None)
        assert status["is_running"] is True

    def test_status_includes_options(self):
        settings = DocumentSchedulerSettings(download_pdfs=True)
        status = self._build_status(settings, False, None, None)
        assert status["processing_options"]["download_pdfs"] is True

    def test_status_includes_interval(self):
        settings = DocumentSchedulerSettings(interval_seconds=900)
        status = self._build_status(settings, False, None, None)
        assert status["interval_seconds"] == 900


# --- Error handling patterns ---


class TestDocumentProcessingErrors:
    """Tests for error handling in document processing."""

    def test_error_count_tracking(self):
        errors = {"doc1": 0}
        errors["doc1"] += 1
        assert errors["doc1"] == 1

    def test_max_retries_check(self):
        error_count = 3
        max_retries = 3
        should_retry = error_count < max_retries
        assert should_retry is False

    def test_should_retry(self):
        error_count = 1
        max_retries = 3
        should_retry = error_count < max_retries
        assert should_retry is True

    def test_error_backoff_calculation(self):
        base_delay = 60
        error_count = 3
        # Exponential backoff
        delay = base_delay * (2 ** (error_count - 1))
        assert delay == 240  # 60 * 2^2


# --- Processing batch patterns ---


class TestDocumentBatchProcessing:
    """Tests for batch document processing patterns."""

    def test_batch_size_limit(self):
        docs = list(range(100))
        batch_size = 10
        batch = docs[:batch_size]
        assert len(batch) == 10

    def test_process_in_batches(self):
        docs = list(range(25))
        batch_size = 10
        batches = [
            docs[i : i + batch_size] for i in range(0, len(docs), batch_size)
        ]
        assert len(batches) == 3
        assert len(batches[0]) == 10
        assert len(batches[1]) == 10
        assert len(batches[2]) == 5

    def test_empty_batch(self):
        docs = []
        batch_size = 10
        batch = docs[:batch_size]
        assert batch == []


# --- Job scheduling patterns ---


class TestDocumentJobScheduling:
    """Tests for document processing job scheduling."""

    def test_job_id_format(self):
        username = "user1"
        job_id = f"doc_process_{username}"
        assert job_id == "doc_process_user1"

    def test_job_exists_check(self):
        scheduled_jobs = {"doc_process_user1", "doc_process_user2"}
        job_id = "doc_process_user1"
        exists = job_id in scheduled_jobs
        assert exists is True

    def test_job_not_exists(self):
        scheduled_jobs = {"doc_process_user2"}
        job_id = "doc_process_user1"
        exists = job_id in scheduled_jobs
        assert exists is False

    def test_remove_job_from_set(self):
        scheduled_jobs = {"job1", "job2", "job3"}
        scheduled_jobs.discard("job2")
        assert "job2" not in scheduled_jobs
        assert len(scheduled_jobs) == 2

    def test_add_job_to_set(self):
        scheduled_jobs = {"job1"}
        scheduled_jobs.add("job2")
        assert "job2" in scheduled_jobs
