"""Tests for transcription.models — Document, Job, Transcript persistence and relationships."""

from uuid import UUID

import pytest
from sqlalchemy.exc import IntegrityError

from transcription.models import Document, Job, JobStatus, Transcript


def _make_document(**overrides) -> Document:
    """Create a Document with sensible defaults."""
    defaults = {"filename": "letter.jpg", "file_path": "/uploads/letter.jpg"}
    defaults.update(overrides)
    return Document(**defaults)


def _persist_document(session) -> Document:
    """Create, persist, and return a Document."""
    doc = _make_document()
    session.add(doc)
    session.commit()
    session.refresh(doc)
    return doc


def _persist_job(session, document: Document) -> Job:
    """Create, persist, and return a Job linked to a Document."""
    job = Job(document_id=document.id)
    session.add(job)
    session.commit()
    session.refresh(job)
    return job


class TestDocumentModel:
    """Verify Document creation and default field population."""

    def test_can_be_persisted(self, session):
        """A Document round-trips through the database with correct fields."""
        doc = _persist_document(session)
        fetched = session.get(Document, doc.id)
        assert fetched is not None
        assert fetched.filename == "letter.jpg"
        assert fetched.file_path == "/uploads/letter.jpg"

    def test_defaults_are_populated(self, session):
        """id is a UUID and uploaded_at is populated on creation."""
        doc = _persist_document(session)
        assert isinstance(doc.id, UUID)
        assert doc.uploaded_at is not None


class TestJobModel:
    """Verify Job creation, defaults, and status transitions."""

    def test_can_be_created_for_document(self, session):
        """A Job linked to a Document via FK persists correctly."""
        doc = _persist_document(session)
        job = _persist_job(session, doc)
        fetched = session.get(Job, job.id)
        assert fetched is not None
        assert fetched.document_id == doc.id

    def test_defaults_are_populated(self, session):
        """Default status is queued; created_at and updated_at are populated."""
        doc = _persist_document(session)
        job = _persist_job(session, doc)
        assert job.status == JobStatus.QUEUED
        assert job.retry_count == 0
        assert job.created_at is not None
        assert job.updated_at is not None

    def test_transitions_to_transcribed(self, session):
        """Status updates from queued to processing to transcribed."""
        doc = _persist_document(session)
        job = _persist_job(session, doc)
        assert job.status == JobStatus.QUEUED

        job.status = JobStatus.PROCESSING
        session.add(job)
        session.commit()
        session.refresh(job)
        assert job.status == JobStatus.PROCESSING

        job.status = JobStatus.TRANSCRIBED
        session.add(job)
        session.commit()
        session.refresh(job)
        assert job.status == JobStatus.TRANSCRIBED

    def test_transitions_to_failed(self, session):
        """Status updates from processing to failed."""
        doc = _persist_document(session)
        job = _persist_job(session, doc)

        job.status = JobStatus.PROCESSING
        session.add(job)
        session.commit()
        session.refresh(job)

        job.status = JobStatus.FAILED
        session.add(job)
        session.commit()
        session.refresh(job)
        assert job.status == JobStatus.FAILED


class TestTranscriptModel:
    """Verify Transcript persistence for success and failure cases."""

    def test_success_record_persists(self, session):
        """A Transcript with text set and error_detail None persists correctly."""
        doc = _persist_document(session)
        job = _persist_job(session, doc)
        transcript = Transcript(job_id=job.id, text="Dear Sir, ...")
        session.add(transcript)
        session.commit()
        session.refresh(transcript)

        fetched = session.get(Transcript, transcript.id)
        assert fetched is not None
        assert fetched.text == "Dear Sir, ..."
        assert fetched.error_detail is None

    def test_failure_record_persists(self, session):
        """A Transcript with text None and error_detail set persists correctly."""
        doc = _persist_document(session)
        job = _persist_job(session, doc)
        transcript = Transcript(job_id=job.id, error_detail="Provider timeout")
        session.add(transcript)
        session.commit()
        session.refresh(transcript)

        fetched = session.get(Transcript, transcript.id)
        assert fetched is not None
        assert fetched.text is None
        assert fetched.error_detail == "Provider timeout"

    def test_job_id_is_unique(self, session):
        """Inserting two transcripts with the same job_id raises an integrity error."""
        doc = _persist_document(session)
        job = _persist_job(session, doc)

        t1 = Transcript(job_id=job.id, text="First")
        session.add(t1)
        session.commit()

        t2 = Transcript(job_id=job.id, text="Duplicate")
        session.add(t2)
        with pytest.raises(IntegrityError):
            session.commit()


class TestRelationships:
    """Verify SQLModel relationship navigation between models."""

    def test_document_exposes_jobs(self, session):
        """document.jobs returns the linked Job list."""
        doc = _persist_document(session)
        _persist_job(session, doc)
        _persist_job(session, doc)

        session.refresh(doc)
        assert len(doc.jobs) == 2
        assert all(isinstance(j, Job) for j in doc.jobs)

    def test_job_exposes_transcript(self, session):
        """job.transcript returns the linked Transcript."""
        doc = _persist_document(session)
        job = _persist_job(session, doc)
        transcript = Transcript(job_id=job.id, text="Transcribed text")
        session.add(transcript)
        session.commit()

        session.refresh(job)
        assert job.transcript is not None
        assert isinstance(job.transcript, Transcript)
        assert job.transcript.text == "Transcribed text"