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package com.oracle.truffle.js.nodes.function;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Cached.Shared;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.nodes.DirectCallNode;
import com.oracle.truffle.api.nodes.IndirectCallNode;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.nodes.interop.ImportValueNode;
import com.oracle.truffle.js.runtime.JSArguments;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.JSRealm;

public abstract class JSLoadNode extends JavaScriptBaseNode {

    protected final JSContext context;

    public static JSLoadNode create(JSContext context) {
        return JSLoadNodeGen.create(context);
    }

    protected JSLoadNode(JSContext context) {
        this.context = context;
    }

    public abstract Object executeLoad(Source source, JSRealm realm);

    protected static CallTarget loadScript(Source source, JSRealm realm) {
        return realm.getEnv().parsePublic(source);
    }

    @TruffleBoundary(allowInlining = true)
    static boolean equals(Source source, Source cachedSource) {
        return source.equals(cachedSource);
    }

    @SuppressWarnings("unused")
    @Specialization(guards = {"cachedSource.isCached()", "equals(source, cachedSource)"}, limit = "1")
    static Object cachedLoad(Source source, JSRealm realm,
                    @Cached @Shared("importValue") ImportValueNode importValue,
                    @Cached("source") Source cachedSource,
                    @Cached("create(loadScript(source, realm))") DirectCallNode callNode) {
        return importValue.executeWithTarget(callNode.call(JSArguments.EMPTY_ARGUMENTS_ARRAY));
    }

    @Specialization(replaces = "cachedLoad")
    static Object uncachedLoad(Source source, JSRealm realm,
                    @Cached @Shared("importValue") ImportValueNode importValue,
                    @Cached IndirectCallNode callNode) {
        return importValue.executeWithTarget(callNode.call(loadScript(source, realm), JSArguments.EMPTY_ARGUMENTS_ARRAY));
    }
}