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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
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 * copyright rights in the Software, and any and all patent rights owned or
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
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 *
 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
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package com.oracle.truffle.js.nodes.cast;

import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.TruffleLanguage.ContextReference;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.CachedContext;
import com.oracle.truffle.api.dsl.Fallback;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.library.CachedLibrary;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.profiles.ConditionProfile;
import com.oracle.truffle.js.lang.JavaScriptLanguage;
import com.oracle.truffle.js.nodes.JSGuards;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.nodes.access.IsPrimitiveNode;
import com.oracle.truffle.js.nodes.access.PropertyNode;
import com.oracle.truffle.js.nodes.function.JSFunctionCallNode;
import com.oracle.truffle.js.nodes.interop.ImportValueNode;
import com.oracle.truffle.js.runtime.BigInt;
import com.oracle.truffle.js.runtime.Boundaries;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSArguments;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.JSRealm;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.SafeInteger;
import com.oracle.truffle.js.runtime.Symbol;
import com.oracle.truffle.js.runtime.objects.JSObject;
import com.oracle.truffle.js.runtime.objects.Null;
import com.oracle.truffle.js.runtime.objects.Undefined;

/**
 * This implements ECMA 7.1.1 ToPrimitive.
 *
 */
public abstract class JSToPrimitiveNode extends JavaScriptBaseNode {

    public enum Hint {
        None,
        String,
        Number
    }

    protected final Hint hint;

    protected JSToPrimitiveNode(Hint hint) {
        this.hint = hint;
    }

    public abstract Object execute(Object value);

    public static JSToPrimitiveNode createHintNone() {
        return create(Hint.None);
    }

    public static JSToPrimitiveNode createHintString() {
        return create(Hint.String);
    }

    public static JSToPrimitiveNode createHintNumber() {
        return create(Hint.Number);
    }

    public static JSToPrimitiveNode create(Hint hint) {
        return JSToPrimitiveNodeGen.create(hint);
    }

    @Specialization
    protected int doInt(int value) {
        return value;
    }

    @Specialization
    protected SafeInteger doSafeInteger(SafeInteger value) {
        return value;
    }

    @Specialization
    protected long doLong(long value) {
        return value;
    }

    @Specialization
    protected double doDouble(double value) {
        return value;
    }

    @Specialization
    protected boolean doBoolean(boolean value) {
        return value;
    }

    @Specialization
    protected CharSequence doString(CharSequence value) {
        return value;
    }

    @Specialization
    protected Symbol doSymbol(Symbol value) {
        return value;
    }

    @Specialization
    protected BigInt doBigInt(BigInt value) {
        return value;
    }

    @Specialization(guards = "isJSNull(value)")
    protected DynamicObject doNull(@SuppressWarnings("unused") Object value) {
        return Null.instance;
    }

    @Specialization(guards = "isUndefined(value)")
    protected DynamicObject doUndefined(@SuppressWarnings("unused") Object value) {
        return Undefined.instance;
    }

    @Specialization(guards = "isJSObject(object)")
    protected Object doJSObject(DynamicObject object,
                    @Cached("createGetToPrimitive(object)") PropertyNode getToPrimitive,
                    @Cached("create()") IsPrimitiveNode isPrimitive,
                    @Cached("createOrdinaryToPrimitive(object)") OrdinaryToPrimitiveNode ordinaryToPrimitive,
                    @Cached("createBinaryProfile()") ConditionProfile exoticToPrimProfile,
                    @Cached("createCall()") JSFunctionCallNode callExoticToPrim) {
        Object exoticToPrim = getToPrimitive.executeWithTarget(object);
        if (exoticToPrimProfile.profile(!JSRuntime.isNullOrUndefined(exoticToPrim))) {
            Object result = callExoticToPrim.executeCall(JSArguments.createOneArg(object, exoticToPrim, getHintName()));
            if (isPrimitive.executeBoolean(result)) {
                return result;
            }
            throw Errors.createTypeError("[Symbol.toPrimitive] method returned a non-primitive object", this);
        }

        return ordinaryToPrimitive.execute(object);
    }

    private String getHintName() {
        switch (hint) {
            case Number:
                return JSRuntime.HINT_NUMBER;
            case String:
                return JSRuntime.HINT_STRING;
            case None:
            default:
                return JSRuntime.HINT_DEFAULT;
        }
    }

    protected final boolean isHintString() {
        return hint == Hint.String;
    }

    protected final boolean isHintNumber() {
        return hint == Hint.Number || hint == Hint.None;
    }

    @Specialization(guards = "isForeignObject(object)", limit = "5")
    protected Object doTruffleJavaObject(Object object,
                    @CachedLibrary("object") InteropLibrary interop,
                    @CachedContext(JavaScriptLanguage.class) ContextReference<JSRealm> contextRef,
                    @Cached("create()") ImportValueNode toJSType) {
        if (interop.isNull(object)) {
            return Null.instance;
        }
        JSRealm realm = contextRef.get();
        TruffleLanguage.Env env = realm.getEnv();
        if (env.isHostObject(object)) {
            Object javaObject = env.asHostObject(object);
            if (javaObject == null) {
                return Null.instance;
            } else if (JSGuards.isJavaPrimitiveNumber(javaObject)) {
                return toJSType.executeWithTarget(javaObject);
            } else if (realm.getContext().isOptionNashornCompatibilityMode() && javaObject instanceof Number) {
                return JSRuntime.doubleValueVirtual((Number) javaObject);
            } else if (JSGuards.isJavaArray(javaObject)) {
                return JSRuntime.javaArrayToString(javaObject);
            } else {
                return JSRuntime.toJSNull(Boundaries.javaToString(javaObject));
            }
        }
        try {
            if (interop.isBoolean(object)) {
                return interop.asBoolean(object);
            } else if (interop.isString(object)) {
                return interop.asString(object);
            } else if (interop.isNumber(object)) {
                if (interop.fitsInInt(object)) {
                    return interop.asInt(object);
                } else if (interop.fitsInLong(object)) {
                    return interop.asLong(object);
                } else if (interop.fitsInDouble(object)) {
                    return interop.asDouble(object);
                }
            }
        } catch (UnsupportedMessageException e) {
            throw Errors.createTypeErrorUnboxException(object, e, this);
        }
        return JSRuntime.foreignToString(object);
    }

    @Fallback
    protected Object doFallback(Object value) {
        assert value != null;
        throw Errors.createTypeErrorCannotConvertToPrimitiveValue(this);
    }

    protected static PropertyNode createGetToPrimitive(DynamicObject object) {
        JSContext context = JSObject.getJSContext(object);
        return PropertyNode.createMethod(context, null, Symbol.SYMBOL_TO_PRIMITIVE);
    }

    protected OrdinaryToPrimitiveNode createOrdinaryToPrimitive(DynamicObject object) {
        JSContext context = JSObject.getJSContext(object);
        return OrdinaryToPrimitiveNode.create(context, isHintString() ? Hint.String : Hint.Number);
    }
}
