package org.shedlang.compiler.shidtopatio;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.shedlang.compiler.patio.operands.PatioLocalRef;
import org.shedlang.compiler.shid.instructions.Shid;
import org.shedlang.compiler.testing.snapshots.SnapshotResolver;
import org.shedlang.compiler.testing.snapshots.Snapshotter;
import org.shedlang.compiler.typechecker.TypeCheckerContext;
import org.shedlang.compiler.types.*;

import java.io.IOException;
import java.util.List;

import static org.shedlang.compiler.shidtopatio.ShidToPatioTesting.serialize;

@ExtendWith({SnapshotResolver.class})
public class ShidToPatioTryTests {
    @Test
    public void canGenerateCodeForTry(Snapshotter snapshotter) throws IOException {
        var namespaceName = new NamespaceName(List.of("Example", "Project"));
        var effect = Effects.userDefined(namespaceName, "State");
        var shidInstruction = Shid.try_(
            effect,
            List.of("a", "c", "b"),
            Shid.block(List.of(
                Shid.pushInt(42)
            ))
        );
        var typeInfos = TypeCheckerContext.EMPTY
            .addUserDefinedEffectInfo(
                effect,
                UserDefinedEffectInfo.builder()
                    .addMethod("c", FunctionType.builder().build())
                    .addMethod("a", FunctionType.builder().build())
                    .addMethod("b", FunctionType.builder().build())
                    .build()
            )
            .toTypeInfos();
        var context = ShidToPatioTesting.createContext(typeInfos)
            .temporaryPush(new PatioLocalRef("other"))
            .temporaryPush(new PatioLocalRef("handlerA"))
            .temporaryPush(new PatioLocalRef("handlerC"))
            .temporaryPush(new PatioLocalRef("handlerB"));

        var result = ShidToPatio.generateInstruction(shidInstruction, context);

        snapshotter.assertSnapshot(serialize(result));
    }

    @Test
    public void effectHandlerIsPoppedBeforeReturn(Snapshotter snapshotter) throws IOException {
        var namespaceName = new NamespaceName(List.of("Example", "Project"));
        var effect = Effects.userDefined(namespaceName, "State");
        var shidInstruction = Shid.try_(
            effect,
            List.of("a"),
            Shid.block(List.of(
                Shid.pushInt(42),
                Shid.return_()
            ))
        );
        var typeInfos = TypeCheckerContext.EMPTY
            .addUserDefinedEffectInfo(
                effect,
                UserDefinedEffectInfo.builder()
                    .addMethod("a", FunctionType.builder().build())
                    .build()
            )
            .toTypeInfos();
        var context = ShidToPatioTesting.createContext(typeInfos)
            .stashGcRootStackIndex(new PatioLocalRef("gcRootStackIndex"))
            .temporaryPush(new PatioLocalRef("other"))
            .temporaryPush(new PatioLocalRef("handlerA"));

        var result = ShidToPatio.generateInstruction(shidInstruction, context);

        snapshotter.assertSnapshot(serialize(result));
    }
}