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package com.oracle.truffle.nfi;

import com.oracle.truffle.api.Assumption;
import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.CompilerAsserts;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.TruffleLanguage.ContextPolicy;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.nfi.NativeSource.Content;
import com.oracle.truffle.nfi.NativeSource.ParsedLibrary;
import com.oracle.truffle.nfi.NativeSource.ParsedSignature;

@TruffleLanguage.Registration(id = "nfi", name = "TruffleNFI", version = "0.1", characterMimeTypes = NFILanguage.MIME_TYPE, internal = true, contextPolicy = ContextPolicy.SHARED)
public class NFILanguage extends TruffleLanguage<NFIContext> {

    public static final String MIME_TYPE = "application/x-native";

    private final Assumption singleContextAssumption = Truffle.getRuntime().createAssumption("NFI single context");

    @Override
    protected NFIContext createContext(Env env) {
        return new NFIContext(env);
    }

    @Override
    protected boolean patchContext(NFIContext context, Env newEnv) {
        context.patch(newEnv);
        return true;
    }

    @Override
    protected void initializeMultipleContexts() {
        super.initializeMultipleContexts();
        singleContextAssumption.invalidate();
    }

    static NFILanguage getCurrentLanguage() {
        CompilerAsserts.neverPartOfCompilation("getCurrentLanguage");
        return getCurrentLanguage(NFILanguage.class);
    }

    static Assumption getSingleContextAssumption() {
        return getCurrentLanguage().singleContextAssumption;
    }

    @Override
    protected CallTarget parse(ParsingRequest request) throws Exception {
        CharSequence nfiSource = request.getSource().getCharacters();
        NativeSource source = Parser.parseNFISource(nfiSource);

        String backendId;
        if (source.isDefaultBackend()) {
            backendId = "native";
        } else {
            backendId = source.getNFIBackendId();
        }

        Content c = source.getContent();
        assert c != null;
        if (c instanceof ParsedLibrary) {
            ParsedLibrary lib = (ParsedLibrary) c;
            return Truffle.getRuntime().createCallTarget(new NFIRootNode(this, lib, backendId));
        } else {
            ParsedSignature sig = (ParsedSignature) c;
            RootNode buildSignature = new SignatureRootNode(this, backendId, sig.getBuildSignatureNode());
            return Truffle.getRuntime().createCallTarget(buildSignature);
        }
    }

    @Override
    protected boolean isThreadAccessAllowed(Thread thread, boolean singleThreaded) {
        return true;
    }
}