import pytest
from fastapi import status


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

    def test_check_in_item(self, test_client, test_db, user_token):
        """Test checking in inventory (increasing quantity)."""
        from backend.models import Item, User

        item = Item(name="Test Item", category="Electronics", type="Component",
                    quantity=10, barcode="BC-CHECKIN", part_number="PN-CI")
        test_db.add(item)
        test_db.commit()

        user = test_db.query(User).filter(User.username == "user").first()
        response = test_client.post(
            "/operations/check-in",
            json={"barcode": "BC-CHECKIN", "quantity": 5, "user_id": user.id},
            headers={"Authorization": f"Bearer {user_token}"}
        )
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert data["quantity"] == 15

    def test_check_out_item(self, test_client, test_db, user_token):
        """Test checking out inventory (decreasing quantity)."""
        from backend.models import Item, User

        item = Item(name="Test Item", category="Electronics", type="Component",
                    quantity=10, barcode="BC-CHECKOUT", part_number="PN-CO")
        test_db.add(item)
        test_db.commit()

        user = test_db.query(User).filter(User.username == "user").first()
        response = test_client.post(
            "/operations/check-out",
            json={"barcode": "BC-CHECKOUT", "quantity": 3, "user_id": user.id},
            headers={"Authorization": f"Bearer {user_token}"}
        )
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert data["quantity"] == 7

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

        item = Item(name="Test Item", category="Electronics", type="Component",
                    quantity=5, barcode="BC-INSUFF", part_number="PN-INS")
        test_db.add(item)
        test_db.commit()

        user = test_db.query(User).filter(User.username == "user").first()
        response = test_client.post(
            "/operations/check-out",
            json={"barcode": "BC-INSUFF", "quantity": 10, "user_id": user.id},
            headers={"Authorization": f"Bearer {user_token}"}
        )
        assert response.status_code == status.HTTP_400_BAD_REQUEST

    def test_audit_log_created(self, test_client, test_db, user_token):
        """Test that audit log entry created for each operation."""
        from backend.models import Item, User

        item = Item(name="Test Item", category="Electronics", type="Component",
                    quantity=10, barcode="BC-AUDIT", part_number="PN-AUD")
        test_db.add(item)
        test_db.commit()

        user = test_db.query(User).filter(User.username == "user").first()
        response = test_client.post(
            "/operations/check-in",
            json={"barcode": "BC-AUDIT", "quantity": 5, "user_id": user.id},
            headers={"Authorization": f"Bearer {user_token}"}
        )
        assert response.status_code == status.HTTP_200_OK

        # Verify audit log via logs endpoint
        response = test_client.get(
            "/operations/logs",
            headers={"Authorization": f"Bearer {user_token}"}
        )
        assert response.status_code == status.HTTP_200_OK
        logs = response.json()
        assert len(logs) > 0
        assert any(log["action"] == "CHECK_IN" for log in logs)


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

    def test_bulk_sync_offline_operations(self, test_client, test_db, user_token):
        """Test syncing multiple offline-generated operations."""
        from backend.models import Item, User
        from datetime import datetime

        item = Item(name="Test Item", category="Electronics", type="Component",
                    quantity=10, barcode="BC-SYNC1", part_number="PN-SYN")
        test_db.add(item)
        test_db.commit()

        user = test_db.query(User).filter(User.username == "user").first()
        response = test_client.post(
            "/operations/bulk-sync",
            json={
                "user_id": user.id,
                "operations": [
                    {"type": "CHECK_IN", "barcode": "BC-SYNC1", "quantity": 5,
                     "uuid": "uuid-sync-1", "timestamp": datetime.utcnow().isoformat()},
                    {"type": "CHECK_IN", "barcode": "BC-SYNC1", "quantity": 3,
                     "uuid": "uuid-sync-2", "timestamp": datetime.utcnow().isoformat()},
                ]
            },
            headers={"Authorization": f"Bearer {user_token}"}
        )
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert "success" in data
        assert len(data["success"]) == 2

    def test_bulk_sync_idempotent(self, test_client, test_db, user_token):
        """Test that syncing same UUID twice doesn't duplicate."""
        from backend.models import Item, User
        from datetime import datetime

        item = Item(name="Test Item", category="Electronics", type="Component",
                    quantity=10, barcode="BC-IDEMP", part_number="PN-IDP")
        test_db.add(item)
        test_db.commit()

        user = test_db.query(User).filter(User.username == "user").first()
        operation = {
            "user_id": user.id,
            "operations": [
                {"type": "CHECK_IN", "barcode": "BC-IDEMP", "quantity": 5,
                 "uuid": "uuid-idempotent-1", "timestamp": datetime.utcnow().isoformat()}
            ]
        }

        # Sync once
        response1 = test_client.post(
            "/operations/bulk-sync", json=operation,
            headers={"Authorization": f"Bearer {user_token}"}
        )
        assert response1.status_code == status.HTTP_200_OK
        assert len(response1.json()["success"]) == 1

        # Sync again with same UUID — should be idempotent (returns "Already synced")
        response2 = test_client.post(
            "/operations/bulk-sync", json=operation,
            headers={"Authorization": f"Bearer {user_token}"}
        )
        assert response2.status_code == status.HTTP_200_OK
        # "Already synced" note in success means idempotent
        assert response2.json()["success"][0].get("note") == "Already synced"