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/*
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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
 * data (collectively the "Software"), free of charge and under any and all
 * 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)
 * the Larger Works (as defined below), to deal in both
 *
 * (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),
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 * This license is subject to the following condition:
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 * 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
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package com.oracle.truffle.js.builtins;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.strings.TruffleString;
import com.oracle.truffle.js.builtins.DateFunctionBuiltinsFactory.DateNowNodeGen;
import com.oracle.truffle.js.builtins.DateFunctionBuiltinsFactory.DateParseNodeGen;
import com.oracle.truffle.js.builtins.DateFunctionBuiltinsFactory.DateUTCNodeGen;
import com.oracle.truffle.js.nodes.cast.JSToNumberNode;
import com.oracle.truffle.js.nodes.cast.JSToStringNode;
import com.oracle.truffle.js.nodes.function.JSBuiltin;
import com.oracle.truffle.js.nodes.function.JSBuiltinNode;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.builtins.BuiltinEnum;
import com.oracle.truffle.js.runtime.builtins.JSDate;

/**
 * Contains builtins for {@linkplain JSDate} function (constructor).
 */
public final class DateFunctionBuiltins extends JSBuiltinsContainer.SwitchEnum {

    public static final JSBuiltinsContainer BUILTINS = new DateFunctionBuiltins();

    protected DateFunctionBuiltins() {
        super(JSDate.CLASS_NAME, DateFunction.class);
    }

    public enum DateFunction implements BuiltinEnum {
        parse(1),
        now(0),
        UTC(7);

        private final int length;

        DateFunction(int length) {
            this.length = length;
        }

        @Override
        public int getLength() {
            return length;
        }
    }

    @Override
    protected Object createNode(JSContext context, JSBuiltin builtin, boolean construct, boolean newTarget, DateFunction builtinEnum) {
        switch (builtinEnum) {
            case parse:
                return DateParseNodeGen.create(context, builtin, args().fixedArgs(1).createArgumentNodes(context));
            case now:
                return DateNowNodeGen.create(context, builtin, args().createArgumentNodes(context));
            case UTC:
                return DateUTCNodeGen.create(context, builtin, args().varArgs().createArgumentNodes(context));
        }
        return null;
    }

    public abstract static class DateParseNode extends JSBuiltinNode {

        public DateParseNode(JSContext context, JSBuiltin builtin) {
            super(context, builtin);
        }

        @Specialization
        protected double parse(Object parseDate,
                        @Cached JSToStringNode toStringNode) {
            TruffleString dateString = toStringNode.executeString(parseDate);
            return ConstructorBuiltins.ConstructDateNode.parseDate(getJSContext(), getRealm(), dateString);
        }

    }

    public abstract static class DateNowNode extends JSBuiltinNode {
        public DateNowNode(JSContext context, JSBuiltin builtin) {
            super(context, builtin);
        }

        @Specialization
        @TruffleBoundary
        protected double now() {
            return getRealm().currentTimeMillis();
        }
    }

    public abstract static class DateUTCNode extends JSBuiltinNode {
        public DateUTCNode(JSContext context, JSBuiltin builtin) {
            super(context, builtin);
        }

        @Specialization
        protected double utc(Object[] args,
                        @Cached JSToNumberNode toNumberNode) {
            double[] argsEvaluated = new double[args.length];
            boolean isNaN = false;
            for (int i = 0; i < args.length; i++) {
                double d = JSRuntime.doubleValue(toNumberNode.executeNumber(args[i]));
                if (Double.isNaN(d)) {
                    isNaN = true;
                }
                argsEvaluated[i] = d;
            }
            if (isNaN) {
                return Double.NaN;
            }
            return JSDate.executeConstructor(argsEvaluated, true);
        }
    }
}