"""Tests for transcription.db — schema bootstrap and session factory."""

from sqlalchemy import inspect
from sqlalchemy import text
from sqlmodel import Session
from sqlmodel import SQLModel
from sqlmodel import create_engine
from sqlmodel.pool import StaticPool


def _in_memory_engine():
    """Create a fresh in-memory SQLite engine for isolated db tests."""
    return create_engine(
        "sqlite://",
        connect_args={"check_same_thread": False},
        poolclass=StaticPool,
    )


class TestSchemaBootstrap:
    """Verify create_all produces the expected table set."""

    def test_create_all_creates_expected_tables(self):
        """After create_all(), core V1 tables exist."""
        engine = _in_memory_engine()
        # Ensure models are imported so metadata is populated
        import transcription.db as db_module
        from transcription.models import Document  # noqa: F401
        from transcription.models import Job  # noqa: F401
        from transcription.models import Transcript  # noqa: F401
        from transcription.models import TranscriptRevision  # noqa: F401

        db_module.create_all(engine=engine)

        inspector = inspect(engine)
        table_names = set(inspector.get_table_names())
        assert "document" in table_names
        assert "job" in table_names
        assert "transcript" in table_names
        assert "transcriptrevision" in table_names

    def test_validate_schema_compatibility_returns_no_issues_for_fresh_schema(self):
        """validate_schema_compatibility reports no issues on fresh schema."""
        engine = _in_memory_engine()

        import transcription.db as db_module

        db_module.create_all(engine=engine)
        issues = db_module.validate_schema_compatibility(engine=engine)

        assert issues == []


class TestSessionFactory:
    """Verify get_session yields and cleans up sessions."""

    def test_get_session_yields_session(self):
        """get_session() yields a usable Session object."""
        engine = _in_memory_engine()
        SQLModel.metadata.create_all(engine)

        import transcription.db as db_module

        with db_module.get_session(engine=engine) as session:
            assert isinstance(session, Session)

    def test_session_is_closed_after_generator_exit(self):
        """After the context manager exits, the session is closed."""
        engine = _in_memory_engine()
        SQLModel.metadata.create_all(engine)

        import transcription.db as db_module

        with db_module.get_session(engine=engine) as session:
            # Session is usable inside the context
            session.execute(text("SELECT 1"))
            captured = session

        # After exiting, the session's internal connection is released
        # (no active transaction bound to the session)
        assert captured._transaction is None


class TestBootstrapPolicy:
    """Verify schema bootstrap policy defaults and overrides."""

    def test_production_defaults_to_no_bootstrap(self):
        """Production defaults to explicit non-bootstrap startup behavior."""
        from transcription.config import Settings
        from transcription.db import should_bootstrap_schema

        settings = Settings(openrouter_api_key="test-key", environment="production")
        assert should_bootstrap_schema(settings) is False

    def test_development_defaults_to_bootstrap(self):
        """Development defaults to schema bootstrap for local workflows."""
        from transcription.config import Settings
        from transcription.db import should_bootstrap_schema

        settings = Settings(openrouter_api_key="test-key", environment="development")
        assert should_bootstrap_schema(settings) is True

    def test_explicit_override_wins(self):
        """Explicit bootstrap_schema_on_startup overrides environment default."""
        from transcription.config import Settings
        from transcription.db import should_bootstrap_schema

        settings = Settings(
            openrouter_api_key="test-key",
            environment="production",
            bootstrap_schema_on_startup=True,
        )
        assert should_bootstrap_schema(settings) is True