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

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.profiles.BranchProfile;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.nodes.cast.JSToNumberNode;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSException;
import com.oracle.truffle.js.runtime.JSRuntime;

public abstract class DefaultNumberOptionNode extends JavaScriptBaseNode {

    protected DefaultNumberOptionNode() {
    }

    public abstract int executeInt(Object value, int minimum, int maximum, int fallback);

    public static DefaultNumberOptionNode create() {
        return DefaultNumberOptionNodeGen.create();
    }

    @Specialization(guards = "!isUndefined(value)")
    public int getOption(Object value, int minimum, int maximum,
                    @SuppressWarnings("unused") int fallback,
                    @Cached("create()") JSToNumberNode toNumberNode,
                    @Cached("create()") BranchProfile errorBranch) {
        Number numValue = toNumberNode.executeNumber(value);
        double doubleValue = JSRuntime.doubleValue(numValue);
        if (Double.isNaN(doubleValue) || doubleValue < minimum || maximum < doubleValue) {
            errorBranch.enter();
            throw createRangeError(doubleValue, minimum, maximum);
        }
        return (int) doubleValue;
    }

    @TruffleBoundary
    private JSException createRangeError(double value, int minimum, int maximum) throws JSException {
        return Errors.createRangeErrorFormat("invalid value %f found where only values between %d and %d are allowed", this, value, minimum, maximum);
    }

    @Specialization(guards = "isUndefined(value)")
    @SuppressWarnings("unused")
    public int getOptionFromUndefined(Object value, int minimum, int maximum, int fallback) {
        return fallback;
    }

}