import pytest
from fastapi import status
from datetime import datetime


class TestStockOperations:
    """Test check-in and check-out operations."""

    def test_check_in_item(self, test_client, test_db):
        """Test checking in inventory (increasing quantity)."""
        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()

        response = test_client.post(
            "/api/operations/check-in",
            json={"item_id": item.id, "quantity": 5}
        )
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert data["new_quantity"] == 15

    def test_check_out_item(self, test_client, test_db):
        """Test checking out inventory (decreasing quantity)."""
        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()

        response = test_client.post(
            "/api/operations/check-out",
            json={"item_id": item.id, "quantity": 3}
        )
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert data["new_quantity"] == 7

    def test_check_out_insufficient_quantity(self, test_client, test_db):
        """Test that check-out fails if quantity insufficient."""
        from backend.models import Item

        item = Item(
            name="Test Item",
            category="Electronics",
            item_type="Component",
            quantity=5,
            barcode="123456789",
            part_number="PN-12345"
        )
        test_db.add(item)
        test_db.commit()

        response = test_client.post(
            "/api/operations/check-out",
            json={"item_id": item.id, "quantity": 10}
        )
        assert response.status_code == status.HTTP_400_BAD_REQUEST

    def test_audit_log_created(self, test_client, test_db):
        """Test that audit log entry created for each operation."""
        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 operation
        response = test_client.post(
            "/api/operations/check-in",
            json={"item_id": item.id, "quantity": 5}
        )
        assert response.status_code == status.HTTP_200_OK

        # Verify audit log
        response = test_client.get(f"/api/audit-logs?item_id={item.id}")
        assert response.status_code == status.HTTP_200_OK
        logs = response.json()
        assert len(logs) > 0
        assert logs[-1]["operation"] == "CHECK_IN"
        assert logs[-1]["quantity_change"] == 5


class TestBulkSync:
    """Test offline sync with UUID idempotency."""

    def test_bulk_sync_offline_operations(self, test_client, test_db):
        """Test syncing multiple offline-generated operations."""
        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()

        # Simulate offline operations with UUIDs
        response = test_client.post(
            "/api/bulk-sync",
            json={
                "operations": [
                    {
                        "id": "uuid-1",
                        "type": "CHECK_IN",
                        "item_id": item.id,
                        "quantity": 5
                    },
                    {
                        "id": "uuid-2",
                        "type": "CHECK_IN",
                        "item_id": item.id,
                        "quantity": 3
                    }
                ]
            }
        )
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert data["synced"] == 2
        assert data["final_quantity"] == 18

    def test_bulk_sync_idempotent(self, test_client, test_db):
        """Test that syncing same UUID twice doesn't duplicate."""
        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 = {
            "id": "uuid-1",
            "type": "CHECK_IN",
            "item_id": item.id,
            "quantity": 5
        }

        # Sync once
        response1 = test_client.post(
            "/api/bulk-sync",
            json={"operations": [operation]}
        )
        assert response1.status_code == status.HTTP_200_OK
        q1 = response1.json()["final_quantity"]

        # Sync again (same UUID)
        response2 = test_client.post(
            "/api/bulk-sync",
            json={"operations": [operation]}
        )
        assert response2.status_code == status.HTTP_200_OK
        q2 = response2.json()["final_quantity"]

        # Quantity should not increase twice
        assert q1 == q2 == 15