package p.studio.compiler;

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertSame;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

class FrontendRegistryServiceTest {

    @Test
    void requireShouldResolveProviderByLanguageId() {
        final var provider = FrontendRegistryService.require(PBSDefinitions.PBS.getLanguageId());

        assertEquals(PBSDefinitions.PBS.getLanguageId(), provider.specification().getLanguageId());
        assertSame(PBSDefinitions.PBS, provider.specification());
    }

    @Test
    void requireShouldFailClearlyForUnknownLanguageId() {
        final var thrown = assertThrows(
                IllegalArgumentException.class,
                () -> FrontendRegistryService.require("unknown-language"));

        assertTrue(thrown.getMessage().contains("unknown-language"));
    }

    @Test
    void specListingShouldBeProviderDerived() {
        final var specs = FrontendRegistryService.listFrontendSpecs();

        assertEquals(1, specs.size());
        assertEquals(PBSDefinitions.PBS.getLanguageId(), specs.getFirst().getLanguageId());
    }

    @Test
    void providerListingShouldExposeOnlyPbsByDefault() {
        final var providers = FrontendRegistryService.listProviders();

        assertEquals(1, providers.size());
        assertEquals(PBSDefinitions.PBS.getLanguageId(), providers.getFirst().specification().getLanguageId());
    }
}