"""
API integration tests for PP-StructureV3 parameter customization
"""

import pytest
import json
from fastapi.testclient import TestClient
from pathlib import Path
from unittest.mock import Mock, patch
from app.main import app
from app.core.database import get_db
from app.models.user import User
from app.models.task import Task, TaskStatus, TaskFile


@pytest.fixture
def client():
    """Create test client"""
    return TestClient(app)


@pytest.fixture
def test_user(db_session):
    """Create test user"""
    user = User(
        email="test@example.com",
        hashed_password="test_hash",
        is_active=True
    )
    db_session.add(user)
    db_session.commit()
    db_session.refresh(user)
    return user


@pytest.fixture
def test_task(db_session, test_user):
    """Create test task with uploaded file"""
    task = Task(
        user_id=test_user.id,
        task_id="test-task-123",
        filename="test.pdf",
        status=TaskStatus.PENDING
    )
    db_session.add(task)
    db_session.commit()
    db_session.refresh(task)

    # Add task file
    task_file = TaskFile(
        task_id=task.id,
        original_name="test.pdf",
        stored_path="/tmp/test.pdf",
        file_size=1024,
        mime_type="application/pdf"
    )
    db_session.add(task_file)
    db_session.commit()

    return task


@pytest.fixture
def auth_headers(test_user):
    """Create auth headers for API calls"""
    # Mock JWT token
    return {"Authorization": "Bearer test_token"}


class TestProcessingOptionsSchema:
    """Test ProcessingOptions schema validation"""

    def test_processing_options_accepts_pp_structure_params(self):
        """Verify ProcessingOptions schema accepts pp_structure_params"""
        from app.schemas.task import ProcessingOptions, PPStructureV3Params

        # Valid params
        params = PPStructureV3Params(
            layout_detection_threshold=0.15,
            layout_nms_threshold=0.2,
            text_det_thresh=0.25,
            layout_merge_bboxes_mode='small'
        )

        options = ProcessingOptions(
            use_dual_track=True,
            language='ch',
            pp_structure_params=params
        )

        assert options.pp_structure_params is not None
        assert options.pp_structure_params.layout_detection_threshold == 0.15

    def test_ppstructure_params_validation_min_max(self):
        """Verify parameter validation (min/max constraints)"""
        from app.schemas.task import PPStructureV3Params
        from pydantic import ValidationError

        # Invalid: threshold > 1
        with pytest.raises(ValidationError):
            PPStructureV3Params(layout_detection_threshold=1.5)

        # Invalid: threshold < 0
        with pytest.raises(ValidationError):
            PPStructureV3Params(layout_nms_threshold=-0.1)

        # Valid: within range
        params = PPStructureV3Params(
            layout_detection_threshold=0.5,
            layout_nms_threshold=0.3
        )
        assert params.layout_detection_threshold == 0.5

    def test_ppstructure_params_merge_mode_validation(self):
        """Verify merge mode validation"""
        from app.schemas.task import PPStructureV3Params
        from pydantic import ValidationError

        # Valid modes
        for mode in ['small', 'large', 'union']:
            params = PPStructureV3Params(layout_merge_bboxes_mode=mode)
            assert params.layout_merge_bboxes_mode == mode

        # Invalid mode
        with pytest.raises(ValidationError):
            PPStructureV3Params(layout_merge_bboxes_mode='invalid')

    def test_ppstructure_params_optional_fields(self):
        """Verify all fields are optional"""
        from app.schemas.task import PPStructureV3Params

        # Empty params should be valid
        params = PPStructureV3Params()
        assert params.model_dump(exclude_none=True) == {}

        # Partial params should be valid
        params = PPStructureV3Params(layout_detection_threshold=0.2)
        data = params.model_dump(exclude_none=True)
        assert 'layout_detection_threshold' in data
        assert 'layout_nms_threshold' not in data


class TestStartTaskEndpoint:
    """Test /tasks/{task_id}/start endpoint with PP-StructureV3 params"""

    @patch('app.routers.tasks.process_task_ocr')
    def test_start_task_with_custom_params(self, mock_process_ocr, client, test_task, auth_headers, db_session):
        """Verify custom PP-StructureV3 params are accepted and passed to OCR service"""

        # Override get_db dependency
        def override_get_db():
            try:
                yield db_session
            finally:
                pass

        # Override auth dependency
        def override_get_current_user():
            return test_task.user

        app.dependency_overrides[get_db] = override_get_db
        from app.core.deps import get_current_user
        app.dependency_overrides[get_current_user] = override_get_current_user

        # Request body with custom params
        request_body = {
            "use_dual_track": True,
            "language": "ch",
            "pp_structure_params": {
                "layout_detection_threshold": 0.15,
                "layout_nms_threshold": 0.2,
                "text_det_thresh": 0.25,
                "layout_merge_bboxes_mode": "small"
            }
        }

        # Make API call
        response = client.post(
            f"/api/v2/tasks/{test_task.task_id}/start",
            json=request_body
        )

        # Verify response
        assert response.status_code == 200
        data = response.json()
        assert data['status'] == 'processing'

        # Verify background task was called with custom params
        mock_process_ocr.assert_called_once()
        call_kwargs = mock_process_ocr.call_args[1]

        assert 'pp_structure_params' in call_kwargs
        assert call_kwargs['pp_structure_params']['layout_detection_threshold'] == 0.15
        assert call_kwargs['pp_structure_params']['text_det_thresh'] == 0.25

        # Clean up
        app.dependency_overrides.clear()

    @patch('app.routers.tasks.process_task_ocr')
    def test_start_task_without_custom_params(self, mock_process_ocr, client, test_task, auth_headers, db_session):
        """Verify task can start without custom params (backward compatibility)"""

        # Override dependencies
        def override_get_db():
            try:
                yield db_session
            finally:
                pass

        def override_get_current_user():
            return test_task.user

        app.dependency_overrides[get_db] = override_get_db
        from app.core.deps import get_current_user
        app.dependency_overrides[get_current_user] = override_get_current_user

        # Request without pp_structure_params
        request_body = {
            "use_dual_track": True,
            "language": "ch"
        }

        response = client.post(
            f"/api/v2/tasks/{test_task.task_id}/start",
            json=request_body
        )

        assert response.status_code == 200

        # Verify background task was called
        mock_process_ocr.assert_called_once()
        call_kwargs = mock_process_ocr.call_args[1]

        # pp_structure_params should be None (not provided)
        assert call_kwargs['pp_structure_params'] is None

        app.dependency_overrides.clear()

    @patch('app.routers.tasks.process_task_ocr')
    def test_start_task_with_partial_params(self, mock_process_ocr, client, test_task, auth_headers, db_session):
        """Verify partial custom params are accepted"""

        # Override dependencies
        def override_get_db():
            try:
                yield db_session
            finally:
                pass

        def override_get_current_user():
            return test_task.user

        app.dependency_overrides[get_db] = override_get_db
        from app.core.deps import get_current_user
        app.dependency_overrides[get_current_user] = override_get_current_user

        # Request with only some params
        request_body = {
            "use_dual_track": True,
            "pp_structure_params": {
                "layout_detection_threshold": 0.1
                # Other params omitted
            }
        }

        response = client.post(
            f"/api/v2/tasks/{test_task.task_id}/start",
            json=request_body
        )

        assert response.status_code == 200

        # Verify only specified param was included
        mock_process_ocr.assert_called_once()
        call_kwargs = mock_process_ocr.call_args[1]
        pp_params = call_kwargs['pp_structure_params']

        assert 'layout_detection_threshold' in pp_params
        assert 'layout_nms_threshold' not in pp_params

        app.dependency_overrides.clear()

    def test_start_task_with_invalid_params(self, client, test_task, db_session):
        """Verify invalid params return 422 validation error"""

        # Override dependencies
        def override_get_db():
            try:
                yield db_session
            finally:
                pass

        def override_get_current_user():
            return test_task.user

        app.dependency_overrides[get_db] = override_get_db
        from app.core.deps import get_current_user
        app.dependency_overrides[get_current_user] = override_get_current_user

        # Request with invalid threshold (> 1)
        request_body = {
            "use_dual_track": True,
            "pp_structure_params": {
                "layout_detection_threshold": 1.5  # Invalid!
            }
        }

        response = client.post(
            f"/api/v2/tasks/{test_task.task_id}/start",
            json=request_body
        )

        # Should return validation error
        assert response.status_code == 422

        app.dependency_overrides.clear()


class TestOpenAPISchema:
    """Test OpenAPI schema includes PP-StructureV3 params"""

    def test_openapi_schema_includes_ppstructure_params(self, client):
        """Verify OpenAPI schema documents PP-StructureV3 parameters"""
        response = client.get("/openapi.json")
        assert response.status_code == 200

        schema = response.json()

        # Check PPStructureV3Params schema exists
        assert 'PPStructureV3Params' in schema['components']['schemas']

        params_schema = schema['components']['schemas']['PPStructureV3Params']

        # Verify all 7 parameters are documented
        assert 'layout_detection_threshold' in params_schema['properties']
        assert 'layout_nms_threshold' in params_schema['properties']
        assert 'layout_merge_bboxes_mode' in params_schema['properties']
        assert 'layout_unclip_ratio' in params_schema['properties']
        assert 'text_det_thresh' in params_schema['properties']
        assert 'text_det_box_thresh' in params_schema['properties']
        assert 'text_det_unclip_ratio' in params_schema['properties']

        # Verify ProcessingOptions includes pp_structure_params
        options_schema = schema['components']['schemas']['ProcessingOptions']
        assert 'pp_structure_params' in options_schema['properties']


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