import pytest
from fastapi import status
from uuid import uuid4


class TestOfflineSync:
    """Test offline sync functionality."""

    def test_sync_operations_with_uuid(self, test_client, test_db):
        """Test that offline operations with UUIDs are tracked."""
        from backend.models import Item

        item = Item(
            name="Test Item",
            category="Electronics",
            item_type="Component",
            quantity=10,
            barcode="123456789",
            part_number="PN-12345"
        )
        test_db.add(item)
        test_db.commit()

        operation_uuid = str(uuid4())
        response = test_client.post(
            "/api/bulk-sync",
            json={
                "operations": [
                    {
                        "id": operation_uuid,
                        "type": "CHECK_IN",
                        "item_id": item.id,
                        "quantity": 5,
                        "timestamp": "2026-04-18T10:00:00Z"
                    }
                ]
            }
        )
        assert response.status_code == status.HTTP_200_OK
        assert response.json()["synced"] == 1

    def test_sync_duplicate_uuid_ignored(self, test_client, test_db):
        """Test that duplicate UUIDs don't create duplicate entries."""
        from backend.models import Item, AuditLog

        item = Item(
            name="Test Item",
            category="Electronics",
            item_type="Component",
            quantity=10,
            barcode="123456789",
            part_number="PN-12345"
        )
        test_db.add(item)
        test_db.commit()

        operation_uuid = str(uuid4())
        operation = {
            "id": operation_uuid,
            "type": "CHECK_IN",
            "item_id": item.id,
            "quantity": 5
        }

        # First sync
        response1 = test_client.post("/api/bulk-sync", json={"operations": [operation]})
        assert response1.status_code == status.HTTP_200_OK

        # Count logs
        logs_before = test_db.query(AuditLog).filter_by(item_id=item.id).count()

        # Second sync (same UUID)
        response2 = test_client.post("/api/bulk-sync", json={"operations": [operation]})
        assert response2.status_code == status.HTTP_200_OK

        # Logs count should be same (no duplicate)
        logs_after = test_db.query(AuditLog).filter_by(item_id=item.id).count()
        assert logs_before == logs_after

    def test_sync_preserves_audit_trail(self, test_client, test_db):
        """Test that audit logs are preserved during sync."""
        from backend.models import Item

        item = Item(
            name="Test Item",
            category="Electronics",
            item_type="Component",
            quantity=10,
            barcode="123456789",
            part_number="PN-12345"
        )
        test_db.add(item)
        test_db.commit()

        # Perform multiple operations
        operations = [
            {"id": str(uuid4()), "type": "CHECK_IN", "item_id": item.id, "quantity": 5},
            {"id": str(uuid4()), "type": "CHECK_IN", "item_id": item.id, "quantity": 3},
            {"id": str(uuid4()), "type": "CHECK_OUT", "item_id": item.id, "quantity": 2}
        ]

        response = test_client.post("/api/bulk-sync", json={"operations": operations})
        assert response.status_code == status.HTTP_200_OK

        # Verify audit logs
        response = test_client.get(f"/api/audit-logs?item_id={item.id}")
        logs = response.json()
        assert len(logs) == 3
        assert logs[0]["operation"] == "CHECK_IN"
        assert logs[0]["quantity_change"] == 5