"""
Tests for bulk upload endpoints (US-008, US-010).

US-008 Acceptance Criteria:
- POST `/api/data-entry/bulk/upload` accepts multipart with multiple files
- Returns list of job_ids for tracking
- Validation: max 100 files per batch, max 10MB per file
- Jobs are created atomically (all or nothing)
- Returns batch_id for grouping
- Creates BatchUpload model in DB with fields: id, user_id, created_at, status, total_files
- Creates batch_jobs table for batch_id ↔ job_id relationship
- pytest tests pass
- API returns correct response schema with batch_id and job_ids list

US-010 Acceptance Criteria:
- GET `/api/data-entry/bulk/batches/{batch_id}/status` endpoint funcțional
- Returnează status agregat: pending_count, processing_count, completed_count, failed_count
- Include lista de jobs cu: job_id, status, filename, receipt_id (dacă completed)
- Include receipt_id pentru jobs completate cu succes
- Suportă parametru `wait` pentru long-polling (max 30 secunde)
- Returnează total_amount suma tuturor receipt-urilor create
- pytest tests pass
"""

import io
import pytest
from unittest.mock import AsyncMock, MagicMock, patch
from datetime import datetime
from decimal import Decimal

from fastapi import FastAPI
from fastapi.testclient import TestClient
from httpx import AsyncClient, ASGITransport

# Import the router and models we're testing
from backend.modules.data_entry.routers.bulk import (
    router, MAX_FILES_PER_BATCH, MAX_FILE_SIZE_BYTES, ALLOWED_MIME_TYPES,
    MAX_WAIT_SECONDS, _compute_batch_overall_status
)
from backend.modules.data_entry.db.models import BatchUpload, BatchJob, BatchStatus
from backend.modules.data_entry.schemas.bulk import BulkUploadResponse, BatchStatusResponse, BatchJobInfo
from backend.modules.data_entry.services.ocr.job_queue import OCRJobStatus
from shared.auth.dependencies import get_current_user
from backend.modules.data_entry.db.database import get_session


# Mock user for authentication
class MockCurrentUser:
    username = "test_user"
    user_id = 1
    # companies is List[str] of company IDs (per CurrentUser model in shared/auth/models.py)
    companies = ["1"]
    permissions = ["data_entry"]


# Create test app with dependency overrides
def create_test_app(mock_session=None, mock_user=None):
    """Create a test FastAPI app with the bulk router and dependency overrides."""
    app = FastAPI()
    app.include_router(router, prefix="/api/data-entry/bulk")

    # Override auth dependency
    if mock_user is not None:
        app.dependency_overrides[get_current_user] = lambda: mock_user

    # Override session dependency
    if mock_session is not None:
        async def override_session():
            yield mock_session
        app.dependency_overrides[get_session] = override_session

    return app


# Fixtures
@pytest.fixture
def mock_current_user():
    return MockCurrentUser()


@pytest.fixture
def mock_session():
    """Create a mock async session."""
    session = AsyncMock()
    session.add = MagicMock()
    session.flush = AsyncMock()
    session.commit = AsyncMock()
    session.rollback = AsyncMock()
    return session


@pytest.fixture
def mock_ocr_job():
    """Create a mock OCR job response."""
    class MockJob:
        def __init__(self, job_id):
            self.id = job_id
    return MockJob


def create_test_file(filename: str, content: bytes, content_type: str):
    """Create a test file-like object for upload."""
    return (filename, io.BytesIO(content), content_type)


# ============================================================================
# Unit Tests for Validation Constants
# ============================================================================

class TestValidationConstants:
    """Test validation constants are properly defined."""

    def test_max_files_per_batch(self):
        """Verify max files per batch is 100."""
        assert MAX_FILES_PER_BATCH == 100

    def test_max_file_size(self):
        """Verify max file size is 10MB."""
        assert MAX_FILE_SIZE_BYTES == 10 * 1024 * 1024

    def test_allowed_mime_types(self):
        """Verify allowed MIME types include PDF, PNG, JPG."""
        assert "image/jpeg" in ALLOWED_MIME_TYPES
        assert "image/png" in ALLOWED_MIME_TYPES
        assert "application/pdf" in ALLOWED_MIME_TYPES


# ============================================================================
# Unit Tests for Models
# ============================================================================

class TestBatchUploadModel:
    """Test BatchUpload model definition."""

    def test_batch_upload_has_required_fields(self):
        """Verify BatchUpload has all required fields."""
        # Create a BatchUpload instance to verify fields exist
        batch = BatchUpload(
            user_id="test_user",
            status=BatchStatus.PENDING,
            total_files=5
        )
        assert batch.user_id == "test_user"
        assert batch.status == BatchStatus.PENDING
        assert batch.total_files == 5
        assert batch.created_at is not None

    def test_batch_status_enum(self):
        """Verify BatchStatus enum values."""
        assert BatchStatus.PENDING == "pending"
        assert BatchStatus.PROCESSING == "processing"
        assert BatchStatus.COMPLETED == "completed"
        assert BatchStatus.FAILED == "failed"


class TestBatchJobModel:
    """Test BatchJob model definition."""

    def test_batch_job_has_required_fields(self):
        """Verify BatchJob has all required fields."""
        batch_job = BatchJob(
            batch_id=1,
            job_id="test-job-uuid",
            filename="test.pdf"
        )
        assert batch_job.batch_id == 1
        assert batch_job.job_id == "test-job-uuid"
        assert batch_job.filename == "test.pdf"
        assert batch_job.receipt_id is None  # Optional field
        assert batch_job.created_at is not None


# ============================================================================
# Unit Tests for Response Schema
# ============================================================================

class TestBulkUploadResponseSchema:
    """Test BulkUploadResponse schema."""

    def test_response_schema_structure(self):
        """Verify response schema has correct structure."""
        response = BulkUploadResponse(
            batch_id=1,
            job_ids=["job-1", "job-2"],
            total_files=2,
            message="2 files queued for processing"
        )
        assert response.batch_id == 1
        assert len(response.job_ids) == 2
        assert response.total_files == 2
        assert "queued" in response.message


# ============================================================================
# Integration Tests with Mocked Dependencies
# ============================================================================

class TestBulkUploadEndpoint:
    """Test POST /api/data-entry/bulk/upload endpoint."""

    @pytest.mark.asyncio
    async def test_upload_single_file_success(self, mock_session, mock_current_user, mock_ocr_job):
        """Test successful upload of a single file."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue, \
             patch("backend.modules.data_entry.routers.bulk.check_duplicate_hashes") as mock_dup_check:
            mock_job = mock_ocr_job("test-job-id-1")
            mock_job_queue.create_job = AsyncMock(return_value=mock_job)

            # Mock duplicate check to return no duplicates
            mock_dup_check.return_value = {}

            # Make flush assign batch.id
            batch_id_counter = [0]
            original_add = mock_session.add
            def tracking_add(obj):
                if hasattr(obj, 'id') and obj.id is None:
                    batch_id_counter[0] += 1
                    obj.id = batch_id_counter[0]
                return original_add(obj)
            mock_session.add = tracking_add

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                files = [("files", ("test.pdf", b"fake pdf content", "application/pdf"))]
                response = await client.post("/api/data-entry/bulk/upload", files=files)

            assert response.status_code == 200
            data = response.json()
            assert "batch_id" in data
            assert "job_ids" in data
            assert "total_files" in data
            assert data["total_files"] == 1

    @pytest.mark.asyncio
    async def test_upload_multiple_files_success(self, mock_session, mock_current_user, mock_ocr_job):
        """Test successful upload of multiple files."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue, \
             patch("backend.modules.data_entry.routers.bulk.check_duplicate_hashes") as mock_dup_check:
            job_counter = [0]
            def create_mock_job(*args, **kwargs):
                job_counter[0] += 1
                return mock_ocr_job(f"test-job-id-{job_counter[0]}")

            mock_job_queue.create_job = AsyncMock(side_effect=create_mock_job)

            # Mock duplicate check to return no duplicates
            mock_dup_check.return_value = {}

            # Make flush assign batch.id
            batch_id_counter = [0]
            original_add = mock_session.add
            def tracking_add(obj):
                if hasattr(obj, 'id') and obj.id is None:
                    batch_id_counter[0] += 1
                    obj.id = batch_id_counter[0]
                return original_add(obj)
            mock_session.add = tracking_add

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                files = [
                    ("files", ("bon1.pdf", b"pdf content 1", "application/pdf")),
                    ("files", ("bon2.jpg", b"jpeg content 2", "image/jpeg")),
                    ("files", ("bon3.png", b"png content 3", "image/png")),
                ]
                response = await client.post("/api/data-entry/bulk/upload", files=files)

            assert response.status_code == 200
            data = response.json()
            assert data["total_files"] == 3
            assert len(data["job_ids"]) == 3

    @pytest.mark.asyncio
    async def test_upload_no_files_returns_400(self, mock_session, mock_current_user):
        """Test that empty file list returns 400 error."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        transport = ASGITransport(app=app)
        async with AsyncClient(transport=transport, base_url="http://test") as client:
            response = await client.post("/api/data-entry/bulk/upload", files=[])

        # FastAPI returns 422 for missing required field
        assert response.status_code == 422

    @pytest.mark.asyncio
    async def test_upload_invalid_mime_type_returns_400(self, mock_session, mock_current_user):
        """Test that invalid MIME type returns 400 error."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        transport = ASGITransport(app=app)
        async with AsyncClient(transport=transport, base_url="http://test") as client:
            files = [("files", ("test.txt", b"text content", "text/plain"))]
            response = await client.post("/api/data-entry/bulk/upload", files=files)

        assert response.status_code == 400
        data = response.json()
        assert "invalid_files" in str(data) or "Validation failed" in str(data)

    @pytest.mark.asyncio
    async def test_upload_file_too_large_returns_400(self, mock_session, mock_current_user):
        """Test that file larger than 10MB returns 400 error."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        transport = ASGITransport(app=app)
        async with AsyncClient(transport=transport, base_url="http://test") as client:
            large_content = b"x" * (11 * 1024 * 1024)
            files = [("files", ("large.pdf", large_content, "application/pdf"))]
            response = await client.post("/api/data-entry/bulk/upload", files=files)

        assert response.status_code == 400
        data = response.json()
        assert "too large" in str(data).lower() or "10mb" in str(data).lower()

    @pytest.mark.asyncio
    async def test_upload_too_many_files_returns_400(self, mock_session, mock_current_user):
        """Test that more than 100 files returns 400 error."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        transport = ASGITransport(app=app)
        async with AsyncClient(transport=transport, base_url="http://test") as client:
            files = [
                ("files", (f"file{i}.pdf", b"content", "application/pdf"))
                for i in range(101)
            ]
            response = await client.post("/api/data-entry/bulk/upload", files=files)

        assert response.status_code == 400
        data = response.json()
        assert "100" in str(data) or "Too many" in str(data)

    @pytest.mark.asyncio
    async def test_upload_atomic_rollback_on_failure(self, mock_session, mock_current_user, mock_ocr_job):
        """Test that all jobs are rolled back if any job creation fails."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue, \
             patch("backend.modules.data_entry.routers.bulk.check_duplicate_hashes") as mock_dup_check:
            call_count = [0]
            async def failing_create_job(*args, **kwargs):
                call_count[0] += 1
                if call_count[0] == 2:
                    raise Exception("Simulated job creation failure")
                return mock_ocr_job(f"test-job-{call_count[0]}")

            mock_job_queue.create_job = failing_create_job

            # Mock duplicate check to return no duplicates
            mock_dup_check.return_value = {}

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                files = [
                    ("files", ("bon1.pdf", b"content1", "application/pdf")),
                    ("files", ("bon2.pdf", b"content2", "application/pdf")),
                ]
                response = await client.post("/api/data-entry/bulk/upload", files=files)

            assert response.status_code == 500
            mock_session.rollback.assert_called_once()

    @pytest.mark.asyncio
    async def test_upload_mixed_valid_invalid_files_returns_400(self, mock_session, mock_current_user):
        """Test that batch with mix of valid and invalid files returns 400 (all or nothing)."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        transport = ASGITransport(app=app)
        async with AsyncClient(transport=transport, base_url="http://test") as client:
            files = [
                ("files", ("valid.pdf", b"pdf content", "application/pdf")),
                ("files", ("invalid.txt", b"text content", "text/plain")),
                ("files", ("valid.jpg", b"jpeg content", "image/jpeg")),
            ]
            response = await client.post("/api/data-entry/bulk/upload", files=files)

        assert response.status_code == 400


# ============================================================================
# Response Schema Validation Tests
# ============================================================================

class TestResponseSchema:
    """Test response schema compliance."""

    @pytest.mark.asyncio
    async def test_response_contains_batch_id(self, mock_session, mock_current_user, mock_ocr_job):
        """Verify response contains batch_id field."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue, \
             patch("backend.modules.data_entry.routers.bulk.check_duplicate_hashes") as mock_dup_check:
            mock_job_queue.create_job = AsyncMock(return_value=mock_ocr_job("test-id"))

            # Mock duplicate check to return no duplicates
            mock_dup_check.return_value = {}

            # Make flush assign batch.id
            batch_id_counter = [0]
            original_add = mock_session.add
            def tracking_add(obj):
                if hasattr(obj, 'id') and obj.id is None:
                    batch_id_counter[0] += 1
                    obj.id = batch_id_counter[0]
                return original_add(obj)
            mock_session.add = tracking_add

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                files = [("files", ("test.pdf", b"content", "application/pdf"))]
                response = await client.post("/api/data-entry/bulk/upload", files=files)

            data = response.json()
            assert "batch_id" in data
            assert isinstance(data["batch_id"], int)

    @pytest.mark.asyncio
    async def test_response_contains_job_ids_list(self, mock_session, mock_current_user, mock_ocr_job):
        """Verify response contains job_ids as a list."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue, \
             patch("backend.modules.data_entry.routers.bulk.check_duplicate_hashes") as mock_dup_check:
            job_counter = [0]
            def create_mock_job(*args, **kwargs):
                job_counter[0] += 1
                return mock_ocr_job(f"job-{job_counter[0]}")
            mock_job_queue.create_job = AsyncMock(side_effect=create_mock_job)

            # Mock duplicate check to return no duplicates
            mock_dup_check.return_value = {}

            # Make flush assign batch.id
            batch_id_counter = [0]
            original_add = mock_session.add
            def tracking_add(obj):
                if hasattr(obj, 'id') and obj.id is None:
                    batch_id_counter[0] += 1
                    obj.id = batch_id_counter[0]
                return original_add(obj)
            mock_session.add = tracking_add

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                files = [
                    ("files", ("file1.pdf", b"c1", "application/pdf")),
                    ("files", ("file2.pdf", b"c2", "application/pdf")),
                ]
                response = await client.post("/api/data-entry/bulk/upload", files=files)

            data = response.json()
            assert "job_ids" in data
            assert isinstance(data["job_ids"], list)
            assert len(data["job_ids"]) == 2


# ============================================================================
# US-010: Batch Status Endpoint Tests
# ============================================================================

class TestBatchStatusEndpointConstants:
    """Test batch status endpoint constants."""

    def test_max_wait_seconds(self):
        """Verify max wait time is 30 seconds."""
        assert MAX_WAIT_SECONDS == 30


class TestComputeBatchOverallStatus:
    """Test _compute_batch_overall_status helper function."""

    def test_all_pending_returns_pending(self):
        """When all jobs are pending, status should be pending."""
        status = _compute_batch_overall_status(
            pending=5, processing=0, completed=0, failed=0, total=5
        )
        assert status == "pending"

    def test_some_processing_returns_processing(self):
        """When some jobs are processing, status should be processing."""
        status = _compute_batch_overall_status(
            pending=2, processing=1, completed=2, failed=0, total=5
        )
        assert status == "processing"

    def test_all_completed_returns_completed(self):
        """When all jobs are completed, status should be completed."""
        status = _compute_batch_overall_status(
            pending=0, processing=0, completed=5, failed=0, total=5
        )
        assert status == "completed"

    def test_all_failed_returns_failed(self):
        """When all jobs failed, status should be failed."""
        status = _compute_batch_overall_status(
            pending=0, processing=0, completed=0, failed=5, total=5
        )
        assert status == "failed"

    def test_mixed_completed_failed_returns_completed(self):
        """When some completed and some failed, status should be completed."""
        status = _compute_batch_overall_status(
            pending=0, processing=0, completed=3, failed=2, total=5
        )
        assert status == "completed"

    def test_some_completed_some_pending_returns_processing(self):
        """When some completed but others pending, status should be processing."""
        status = _compute_batch_overall_status(
            pending=2, processing=0, completed=3, failed=0, total=5
        )
        assert status == "processing"


class TestBatchStatusResponseSchema:
    """Test BatchStatusResponse schema."""

    def test_response_schema_structure(self):
        """Verify response schema has correct structure."""
        response = BatchStatusResponse(
            batch_id=1,
            status="processing",
            total_files=5,
            pending_count=2,
            processing_count=1,
            completed_count=2,
            failed_count=0,
            jobs=[
                BatchJobInfo(
                    job_id="job-1",
                    filename="bon1.pdf",
                    status="completed",
                    receipt_id=10
                ),
                BatchJobInfo(
                    job_id="job-2",
                    filename="bon2.pdf",
                    status="processing",
                    receipt_id=None
                )
            ],
            total_amount=150.50,
            created_at=datetime.utcnow()
        )
        assert response.batch_id == 1
        assert response.status == "processing"
        assert response.pending_count == 2
        assert response.processing_count == 1
        assert response.completed_count == 2
        assert response.failed_count == 0
        assert len(response.jobs) == 2
        assert response.total_amount == 150.50

    def test_batch_job_info_with_receipt_id(self):
        """Verify BatchJobInfo includes receipt_id for completed jobs."""
        job = BatchJobInfo(
            job_id="test-job",
            filename="test.pdf",
            status="completed",
            receipt_id=42
        )
        assert job.receipt_id == 42

    def test_batch_job_info_without_receipt_id(self):
        """Verify BatchJobInfo handles None receipt_id."""
        job = BatchJobInfo(
            job_id="test-job",
            filename="test.pdf",
            status="pending",
            receipt_id=None
        )
        assert job.receipt_id is None


class TestBatchStatusEndpoint:
    """Test GET /api/data-entry/bulk/batches/{batch_id}/status endpoint."""

    @pytest.fixture
    def mock_batch(self):
        """Create a mock batch."""
        batch = MagicMock()
        batch.id = 1
        batch.user_id = "test_user"
        batch.status = BatchStatus.PROCESSING
        batch.total_files = 3
        batch.created_at = datetime.utcnow()
        return batch

    @pytest.fixture
    def mock_batch_jobs(self):
        """Create mock batch_jobs."""
        jobs = []
        for i in range(3):
            job = MagicMock()
            job.batch_id = 1
            job.job_id = f"job-{i+1}"
            job.filename = f"bon{i+1}.pdf"
            job.receipt_id = (i + 10) if i == 0 else None  # First job has receipt
            jobs.append(job)
        return jobs

    @pytest.fixture
    def mock_ocr_jobs(self):
        """Create mock OCR jobs with different statuses."""
        def create_ocr_job(job_id, status):
            job = MagicMock()
            job.id = job_id
            job.status = OCRJobStatus(status)
            return job
        return {
            "job-1": create_ocr_job("job-1", "completed"),
            "job-2": create_ocr_job("job-2", "processing"),
            "job-3": create_ocr_job("job-3", "pending"),
        }

    @pytest.mark.asyncio
    async def test_get_batch_status_success(
        self, mock_session, mock_current_user, mock_batch, mock_batch_jobs, mock_ocr_jobs
    ):
        """Test successful batch status retrieval."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue:
            # Mock batch query
            batch_result = MagicMock()
            batch_result.scalar_one_or_none = MagicMock(return_value=mock_batch)

            # Mock batch_jobs query
            jobs_result = MagicMock()
            jobs_scalars = MagicMock()
            jobs_scalars.all = MagicMock(return_value=mock_batch_jobs)
            jobs_result.scalars = MagicMock(return_value=jobs_scalars)

            # Mock amount query (return sum of receipts)
            amount_result = MagicMock()
            amount_result.scalar = MagicMock(return_value=Decimal("125.50"))

            # Setup session.execute to return different results for different queries
            call_count = [0]
            async def mock_execute(query):
                call_count[0] += 1
                if call_count[0] == 1:
                    return batch_result
                elif call_count[0] == 2:
                    return jobs_result
                else:
                    return amount_result

            mock_session.execute = mock_execute

            # Mock job_queue.get_job
            async def get_job(job_id):
                return mock_ocr_jobs.get(job_id)
            mock_job_queue.get_job = get_job

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                response = await client.get("/api/data-entry/bulk/batches/1/status")

            assert response.status_code == 200
            data = response.json()

            # Verify response structure
            assert data["batch_id"] == 1
            assert data["total_files"] == 3
            assert "pending_count" in data
            assert "processing_count" in data
            assert "completed_count" in data
            assert "failed_count" in data
            assert "jobs" in data
            assert "total_amount" in data
            assert "created_at" in data

    @pytest.mark.asyncio
    async def test_batch_not_found_returns_404(self, mock_session, mock_current_user):
        """Test that non-existent batch returns 404."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        # Mock batch query returning None
        batch_result = MagicMock()
        batch_result.scalar_one_or_none = MagicMock(return_value=None)

        async def mock_execute(query):
            return batch_result
        mock_session.execute = mock_execute

        transport = ASGITransport(app=app)
        async with AsyncClient(transport=transport, base_url="http://test") as client:
            response = await client.get("/api/data-entry/bulk/batches/99999/status")

        assert response.status_code == 404
        assert "not found" in response.json()["detail"].lower()

    @pytest.mark.asyncio
    async def test_wait_parameter_validation(self, mock_session, mock_current_user, mock_batch):
        """Test that wait parameter is validated (0-30 seconds)."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        transport = ASGITransport(app=app)
        async with AsyncClient(transport=transport, base_url="http://test") as client:
            # Wait > 30 should fail validation
            response = await client.get("/api/data-entry/bulk/batches/1/status?wait=31")

        # FastAPI returns 422 for validation errors
        assert response.status_code == 422

    @pytest.mark.asyncio
    async def test_status_counts_are_correct(
        self, mock_session, mock_current_user, mock_batch, mock_batch_jobs, mock_ocr_jobs
    ):
        """Test that status counts match job statuses."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue:
            batch_result = MagicMock()
            batch_result.scalar_one_or_none = MagicMock(return_value=mock_batch)

            jobs_result = MagicMock()
            jobs_scalars = MagicMock()
            jobs_scalars.all = MagicMock(return_value=mock_batch_jobs)
            jobs_result.scalars = MagicMock(return_value=jobs_scalars)

            amount_result = MagicMock()
            amount_result.scalar = MagicMock(return_value=None)

            call_count = [0]
            async def mock_execute(query):
                call_count[0] += 1
                if call_count[0] == 1:
                    return batch_result
                elif call_count[0] == 2:
                    return jobs_result
                else:
                    return amount_result
            mock_session.execute = mock_execute

            async def get_job(job_id):
                return mock_ocr_jobs.get(job_id)
            mock_job_queue.get_job = get_job

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                response = await client.get("/api/data-entry/bulk/batches/1/status")

            data = response.json()
            # mock_ocr_jobs has 1 completed, 1 processing, 1 pending
            assert data["completed_count"] == 1
            assert data["processing_count"] == 1
            assert data["pending_count"] == 1
            assert data["failed_count"] == 0

    @pytest.mark.asyncio
    async def test_jobs_list_includes_receipt_id(
        self, mock_session, mock_current_user, mock_batch, mock_batch_jobs, mock_ocr_jobs
    ):
        """Test that jobs list includes receipt_id for completed jobs."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue:
            batch_result = MagicMock()
            batch_result.scalar_one_or_none = MagicMock(return_value=mock_batch)

            jobs_result = MagicMock()
            jobs_scalars = MagicMock()
            jobs_scalars.all = MagicMock(return_value=mock_batch_jobs)
            jobs_result.scalars = MagicMock(return_value=jobs_scalars)

            amount_result = MagicMock()
            amount_result.scalar = MagicMock(return_value=Decimal("100.00"))

            call_count = [0]
            async def mock_execute(query):
                call_count[0] += 1
                if call_count[0] == 1:
                    return batch_result
                elif call_count[0] == 2:
                    return jobs_result
                else:
                    return amount_result
            mock_session.execute = mock_execute

            async def get_job(job_id):
                return mock_ocr_jobs.get(job_id)
            mock_job_queue.get_job = get_job

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                response = await client.get("/api/data-entry/bulk/batches/1/status")

            data = response.json()
            jobs = data["jobs"]
            assert len(jobs) == 3

            # Find the completed job (job-1 has receipt_id=10)
            completed_job = next((j for j in jobs if j["job_id"] == "job-1"), None)
            assert completed_job is not None
            assert completed_job["receipt_id"] == 10

            # Other jobs should have None receipt_id
            pending_job = next((j for j in jobs if j["job_id"] == "job-3"), None)
            assert pending_job is not None
            assert pending_job["receipt_id"] is None

    @pytest.mark.asyncio
    async def test_total_amount_calculation(
        self, mock_session, mock_current_user, mock_batch, mock_batch_jobs, mock_ocr_jobs
    ):
        """Test that total_amount sums receipt amounts correctly."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue:
            batch_result = MagicMock()
            batch_result.scalar_one_or_none = MagicMock(return_value=mock_batch)

            jobs_result = MagicMock()
            jobs_scalars = MagicMock()
            jobs_scalars.all = MagicMock(return_value=mock_batch_jobs)
            jobs_result.scalars = MagicMock(return_value=jobs_scalars)

            # Total amount should be 250.75
            amount_result = MagicMock()
            amount_result.scalar = MagicMock(return_value=Decimal("250.75"))

            call_count = [0]
            async def mock_execute(query):
                call_count[0] += 1
                if call_count[0] == 1:
                    return batch_result
                elif call_count[0] == 2:
                    return jobs_result
                else:
                    return amount_result
            mock_session.execute = mock_execute

            async def get_job(job_id):
                return mock_ocr_jobs.get(job_id)
            mock_job_queue.get_job = get_job

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                response = await client.get("/api/data-entry/bulk/batches/1/status")

            data = response.json()
            assert data["total_amount"] == 250.75


class TestBatchStatusLongPolling:
    """Test long-polling behavior of batch status endpoint."""

    @pytest.mark.asyncio
    async def test_wait_zero_returns_immediately(self, mock_session, mock_current_user):
        """Test that wait=0 returns immediately without waiting."""
        mock_batch = MagicMock()
        mock_batch.id = 1
        mock_batch.total_files = 2
        mock_batch.created_at = datetime.utcnow()

        mock_batch_jobs = [
            MagicMock(batch_id=1, job_id="job-1", filename="bon1.pdf", receipt_id=None),
            MagicMock(batch_id=1, job_id="job-2", filename="bon2.pdf", receipt_id=None),
        ]

        mock_ocr_job = MagicMock()
        mock_ocr_job.status = OCRJobStatus.pending

        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue:
            batch_result = MagicMock()
            batch_result.scalar_one_or_none = MagicMock(return_value=mock_batch)

            jobs_result = MagicMock()
            jobs_scalars = MagicMock()
            jobs_scalars.all = MagicMock(return_value=mock_batch_jobs)
            jobs_result.scalars = MagicMock(return_value=jobs_scalars)

            call_count = [0]
            async def mock_execute(query):
                call_count[0] += 1
                if call_count[0] == 1:
                    return batch_result
                else:
                    return jobs_result
            mock_session.execute = mock_execute

            async def get_job(job_id):
                return mock_ocr_job
            mock_job_queue.get_job = get_job

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                import time
                start = time.time()
                response = await client.get("/api/data-entry/bulk/batches/1/status?wait=0")
                elapsed = time.time() - start

            assert response.status_code == 200
            # Should return almost immediately (under 0.5 seconds)
            assert elapsed < 0.5

    @pytest.mark.asyncio
    async def test_no_wait_param_returns_immediately(self, mock_session, mock_current_user):
        """Test that no wait param returns immediately."""
        mock_batch = MagicMock()
        mock_batch.id = 1
        mock_batch.total_files = 1
        mock_batch.created_at = datetime.utcnow()

        mock_batch_jobs = [
            MagicMock(batch_id=1, job_id="job-1", filename="bon1.pdf", receipt_id=None),
        ]

        mock_ocr_job = MagicMock()
        mock_ocr_job.status = OCRJobStatus.pending

        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue:
            batch_result = MagicMock()
            batch_result.scalar_one_or_none = MagicMock(return_value=mock_batch)

            jobs_result = MagicMock()
            jobs_scalars = MagicMock()
            jobs_scalars.all = MagicMock(return_value=mock_batch_jobs)
            jobs_result.scalars = MagicMock(return_value=jobs_scalars)

            call_count = [0]
            async def mock_execute(query):
                call_count[0] += 1
                if call_count[0] == 1:
                    return batch_result
                else:
                    return jobs_result
            mock_session.execute = mock_execute

            async def get_job(job_id):
                return mock_ocr_job
            mock_job_queue.get_job = get_job

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                import time
                start = time.time()
                response = await client.get("/api/data-entry/bulk/batches/1/status")
                elapsed = time.time() - start

            assert response.status_code == 200
            assert elapsed < 0.5


# ============================================================================
# US-007: Duplicate Detection Tests
# ============================================================================

class TestDuplicateDetectionHelpers:
    """Test helper functions for duplicate detection."""

    def test_compute_file_hash_produces_sha256(self):
        """Verify compute_file_hash produces valid SHA-256 hash."""
        from backend.modules.data_entry.routers.bulk import compute_file_hash
        content = b"test content for hashing"
        hash_result = compute_file_hash(content)

        # SHA-256 produces 64 hex characters
        assert len(hash_result) == 64
        assert all(c in "0123456789abcdef" for c in hash_result)

    def test_compute_file_hash_deterministic(self):
        """Verify same content produces same hash."""
        from backend.modules.data_entry.routers.bulk import compute_file_hash
        content = b"test content"

        hash1 = compute_file_hash(content)
        hash2 = compute_file_hash(content)

        assert hash1 == hash2

    def test_compute_file_hash_different_content(self):
        """Verify different content produces different hash."""
        from backend.modules.data_entry.routers.bulk import compute_file_hash

        hash1 = compute_file_hash(b"content A")
        hash2 = compute_file_hash(b"content B")

        assert hash1 != hash2


class TestDuplicateDetectionInBulkUpload:
    """Test duplicate detection in bulk upload endpoint (US-007)."""

    @pytest.mark.asyncio
    async def test_all_duplicates_returns_409(self, mock_session, mock_current_user, mock_ocr_job):
        """Test that uploading all duplicate files returns 409 Conflict."""
        from backend.modules.data_entry.routers.bulk import compute_file_hash
        from backend.modules.data_entry.db.models import Receipt

        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        # Calculate hash for test content
        test_content = b"duplicate pdf content"
        test_hash = compute_file_hash(test_content)

        # Mock database query to return existing receipt with this hash
        existing_receipt = MagicMock()
        existing_receipt.id = 123
        existing_receipt.file_hash = test_hash

        # Mock the duplicate check query
        mock_result = MagicMock()
        mock_result.all = MagicMock(return_value=[(test_hash, 123)])

        async def mock_execute(query):
            return mock_result
        mock_session.execute = mock_execute

        transport = ASGITransport(app=app)
        async with AsyncClient(transport=transport, base_url="http://test") as client:
            files = [("files", ("duplicate.pdf", test_content, "application/pdf"))]
            response = await client.post("/api/data-entry/bulk/upload", files=files)

        assert response.status_code == 409
        data = response.json()
        assert "all_duplicates" in str(data) or "duplicate" in str(data).lower()

    @pytest.mark.asyncio
    async def test_partial_duplicates_processes_non_duplicates(self, mock_session, mock_current_user, mock_ocr_job):
        """Test that with some duplicates, non-duplicates are processed normally."""
        from backend.modules.data_entry.routers.bulk import compute_file_hash

        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        duplicate_content = b"duplicate content"
        new_content = b"new unique content"
        duplicate_hash = compute_file_hash(duplicate_content)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue:
            mock_job = mock_ocr_job("test-job-id")
            mock_job_queue.create_job = AsyncMock(return_value=mock_job)

            # Track batch creation
            batch_id_counter = [0]
            original_add = mock_session.add
            def tracking_add(obj):
                if hasattr(obj, 'id') and obj.id is None:
                    batch_id_counter[0] += 1
                    obj.id = batch_id_counter[0]
                return original_add(obj)
            mock_session.add = tracking_add

            # Mock the duplicate check query - only duplicate_hash exists
            mock_result = MagicMock()
            mock_result.all = MagicMock(return_value=[(duplicate_hash, 123)])

            async def mock_execute(query):
                return mock_result
            mock_session.execute = mock_execute

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                files = [
                    ("files", ("duplicate.pdf", duplicate_content, "application/pdf")),
                    ("files", ("new.pdf", new_content, "application/pdf")),
                ]
                response = await client.post("/api/data-entry/bulk/upload", files=files)

        # Should succeed (200) because one file can be processed
        assert response.status_code == 200
        data = response.json()

        # Response should contain duplicate info
        assert "duplicates" in data or "duplicate_files" in data

    @pytest.mark.asyncio
    async def test_no_duplicates_normal_processing(self, mock_session, mock_current_user, mock_ocr_job):
        """Test that files without duplicates are processed normally."""
        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        with patch("backend.modules.data_entry.routers.bulk.job_queue") as mock_job_queue:
            mock_job = mock_ocr_job("test-job-id")
            mock_job_queue.create_job = AsyncMock(return_value=mock_job)

            # Track batch creation
            batch_id_counter = [0]
            original_add = mock_session.add
            def tracking_add(obj):
                if hasattr(obj, 'id') and obj.id is None:
                    batch_id_counter[0] += 1
                    obj.id = batch_id_counter[0]
                return original_add(obj)
            mock_session.add = tracking_add

            # Mock the duplicate check query - no duplicates found
            mock_result = MagicMock()
            mock_result.all = MagicMock(return_value=[])

            async def mock_execute(query):
                return mock_result
            mock_session.execute = mock_execute

            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                files = [("files", ("new.pdf", b"brand new content", "application/pdf"))]
                response = await client.post("/api/data-entry/bulk/upload", files=files)

        assert response.status_code == 200
        data = response.json()
        assert "batch_id" in data
        assert "job_ids" in data

    @pytest.mark.asyncio
    async def test_duplicate_response_includes_existing_receipt_id(self, mock_session, mock_current_user):
        """Test that duplicate error includes existing_receipt_id (US-007 AC3)."""
        from backend.modules.data_entry.routers.bulk import compute_file_hash

        app = create_test_app(mock_session=mock_session, mock_user=mock_current_user)

        test_content = b"duplicate content"
        test_hash = compute_file_hash(test_content)
        existing_receipt_id = 456

        # Mock the duplicate check query
        mock_result = MagicMock()
        mock_result.all = MagicMock(return_value=[(test_hash, existing_receipt_id)])

        async def mock_execute(query):
            return mock_result
        mock_session.execute = mock_execute

        transport = ASGITransport(app=app)
        async with AsyncClient(transport=transport, base_url="http://test") as client:
            files = [("files", ("test.pdf", test_content, "application/pdf"))]
            response = await client.post("/api/data-entry/bulk/upload", files=files)

        assert response.status_code == 409
        data = response.json()

        # Check that the response contains duplicate info with receipt ID
        detail = data.get("detail", {})
        duplicates = detail.get("duplicates", [])
        assert len(duplicates) > 0
        assert duplicates[0]["existing_receipt_id"] == existing_receipt_id
        assert duplicates[0]["error"] == "duplicate"


class TestDuplicateResponseSchema:
    """Test response schemas for duplicate detection."""

    def test_duplicate_file_info_schema(self):
        """Verify DuplicateFileInfo schema has correct structure."""
        from backend.modules.data_entry.schemas.bulk import DuplicateFileInfo

        info = DuplicateFileInfo(
            filename="test.pdf",
            error="duplicate",
            existing_receipt_id=123,
            message="Fișier duplicat - există deja ca bon #123"
        )

        assert info.filename == "test.pdf"
        assert info.error == "duplicate"
        assert info.existing_receipt_id == 123
        assert "123" in info.message

    def test_bulk_upload_response_with_duplicates_schema(self):
        """Verify BulkUploadResponseWithDuplicates schema has correct structure."""
        from backend.modules.data_entry.schemas.bulk import (
            BulkUploadResponseWithDuplicates,
            DuplicateFileInfo
        )

        response = BulkUploadResponseWithDuplicates(
            batch_id=1,
            job_ids=["job-1", "job-2"],
            total_files=4,
            processed_files=2,
            duplicate_files=2,
            duplicates=[
                DuplicateFileInfo(
                    filename="dup1.pdf",
                    error="duplicate",
                    existing_receipt_id=10,
                    message="Fișier duplicat - există deja ca bon #10"
                ),
                DuplicateFileInfo(
                    filename="dup2.pdf",
                    error="duplicate",
                    existing_receipt_id=11,
                    message="Fișier duplicat - există deja ca bon #11"
                ),
            ],
            message="2 fișier(e) în procesare, 2 duplicate ignorate"
        )

        assert response.batch_id == 1
        assert response.total_files == 4
        assert response.processed_files == 2
        assert response.duplicate_files == 2
        assert len(response.duplicates) == 2


if __name__ == "__main__":
    pytest.main([__file__, "-v"])