# =====================================================
# Apckeyl Framework
# Version 1.0
# test_compute_provider_selector.py
# =====================================================

"""
Tests for Compute Provider Selector.

Version 1.0
"""

from compute_provider_selector import (
    ComputeProviderSelector,
)

from compute_provider_registry import (
    ComputeProviderRegistry,
)

from example_compute_provider import (
    ExampleComputeProvider,
)


# =====================================================
# Test Selector Creation
# =====================================================

def test_selector_creation():

    registry = ComputeProviderRegistry()

    selector = ComputeProviderSelector(
        registry
    )

    assert selector is not None

    assert selector.registry is registry


# =====================================================
# Test Missing Registry
# =====================================================

def test_selector_requires_registry():

    try:

        ComputeProviderSelector(
            None
        )

        assert False

    except ValueError as error:

        assert str(error) == (
            "Registry is required"
        )


# =====================================================
# Test Provider Selection
# =====================================================

def test_select_provider():

    registry = ComputeProviderRegistry()

    provider = ExampleComputeProvider()

    registry.register(
        provider
    )

    selector = ComputeProviderSelector(
        registry
    )

    result = selector.select(
        "example_task"
    )

    assert result is provider


# =====================================================
# Test Unknown Task
# =====================================================

def test_select_unknown_task():

    registry = ComputeProviderRegistry()

    provider = ExampleComputeProvider()

    registry.register(
        provider
    )

    selector = ComputeProviderSelector(
        registry
    )

    result = selector.select(
        "unknown_task"
    )

    assert result is None


# =====================================================
# Test Empty Task
# =====================================================

def test_select_empty_task():

    registry = ComputeProviderRegistry()

    provider = ExampleComputeProvider()

    registry.register(
        provider
    )

    selector = ComputeProviderSelector(
        registry
    )

    assert selector.select(
        ""
    ) is None

    assert selector.select(
        None
    ) is None


# =====================================================
# Test Availability
# =====================================================

def test_is_available():

    registry = ComputeProviderRegistry()

    provider = ExampleComputeProvider()

    registry.register(
        provider
    )

    selector = ComputeProviderSelector(
        registry
    )

    assert selector.is_available(
        "example_task"
    ) is True


# =====================================================
# Test Unavailable Task
# =====================================================

def test_is_not_available():

    registry = ComputeProviderRegistry()

    provider = ExampleComputeProvider()

    registry.register(
        provider
    )

    selector = ComputeProviderSelector(
        registry
    )

    assert selector.is_available(
        "unknown_task"
    ) is False


# =====================================================
# End of File
# =====================================================