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

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.js.nodes.cast.JSToObjectNode;
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.util.IntlUtil;

public abstract class SupportedLocalesOfNode extends JSBuiltinNode {

    @Child JSToCanonicalizedLocaleListNode toCanonicalizedLocaleListNode;

    public SupportedLocalesOfNode(JSContext context, JSBuiltin builtin) {
        super(context, builtin);
        this.toCanonicalizedLocaleListNode = JSToCanonicalizedLocaleListNode.create(context);
    }

    @Specialization(guards = "isUndefined(opts)")
    protected Object getSupportedLocales(Object locales, @SuppressWarnings("unused") Object opts) {
        return JSRuntime.createArrayFromList(getContext(), IntlUtil.supportedLocales(getContext(), toCanonicalizedLocaleListNode.executeLanguageTags(locales), IntlUtil.BEST_FIT));
    }

    @Specialization(guards = "!isUndefined(opts)")
    protected Object getSupportedLocalesWithOptions(Object locales, Object opts,
                    @Cached("createToObject(getContext())") JSToObjectNode toObjectNode,
                    @Cached("createMatcherGetter(getContext())") GetStringOptionNode getMatcherNode) {

        String matcher = getMatcherNode.executeValue(toObjectNode.execute(opts));
        return JSRuntime.createArrayFromList(getContext(), IntlUtil.supportedLocales(getContext(), toCanonicalizedLocaleListNode.executeLanguageTags(locales), matcher));
    }

    protected static GetStringOptionNode createMatcherGetter(JSContext context) {
        return GetStringOptionNode.create(context, IntlUtil.LOCALE_MATCHER,
                        new String[]{IntlUtil.LOOKUP, IntlUtil.BEST_FIT}, IntlUtil.BEST_FIT);
    }
}