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from __future__ import annotations

from airflow.sdk.definitions.operator_resources import Resources

from tests_common.test_utils.config import conf_vars


class TestResources:
    def test_resource_eq(self):
        r = Resources(cpus=0.1, ram=2048)
        assert r not in [{}, [], None]
        assert r == r

        r2 = Resources(cpus=0.1, ram=2048)
        assert r == r2
        assert r2 == r

        r3 = Resources(cpus=0.2, ram=2048)
        assert r != r3

    def test_to_dict(self):
        r = Resources(cpus=0.1, ram=2048, disk=1024, gpus=1)
        assert r.to_dict() == {
            "cpus": {"name": "CPU", "qty": 0.1, "units_str": "core(s)"},
            "ram": {"name": "RAM", "qty": 2048, "units_str": "MB"},
            "disk": {"name": "Disk", "qty": 1024, "units_str": "MB"},
            "gpus": {"name": "GPU", "qty": 1, "units_str": "gpu(s)"},
        }

    def test_defaults_read_from_conf_at_instantiation(self):
        """When fields are omitted, ``Resources`` should read defaults from the ``operators``
        section at instantiation time (not at module import time).
        """
        with conf_vars(
            {
                ("operators", "default_cpus"): "7",
                ("operators", "default_ram"): "5120",
                ("operators", "default_disk"): "8192",
                ("operators", "default_gpus"): "3",
            }
        ):
            r = Resources()
            assert r.cpus.qty == 7
            assert r.ram.qty == 5120
            assert r.disk.qty == 8192
            assert r.gpus.qty == 3

    def test_falsy_zero_values_are_preserved(self):
        """Explicit ``0`` for a resource must not be replaced by the config default —
        only ``None`` (the sentinel for "not supplied") should fall back to config.
        """
        with conf_vars(
            {
                ("operators", "default_cpus"): "4",
                ("operators", "default_ram"): "2048",
                ("operators", "default_disk"): "1024",
                ("operators", "default_gpus"): "2",
            }
        ):
            r = Resources(cpus=0, ram=0, disk=0, gpus=0)
            assert r.cpus.qty == 0
            assert r.ram.qty == 0
            assert r.disk.qty == 0
            assert r.gpus.qty == 0
