package org.openautonomousconnection.luascript.tables;

import org.luaj.vm2.LuaValue;
import org.luaj.vm2.lib.*;
import org.openautonomousconnection.luascript.events.JavaToLua;
import org.openautonomousconnection.luascript.hosts.HostServices;
import org.openautonomousconnection.luascript.hosts.UtilHost;
import org.openautonomousconnection.luascript.utils.ScriptTable;

/**
 * Lua table: util
 *
 * <p>Functions:</p>
 * <ul>
 *   <li>util.base64Encode(text)</li>
 *   <li>util.base64Decode(b64)</li>
 *   <li>util.randomHex(bytes)</li>
 *   <li>util.parseUrl(url) -> map</li>
 *   <li>util.parseQuery(query) -> map(key->array)</li>
 *   <li>util.jsonStringifyExpr(elementId, jsExpr) -> jsonString</li>
 *   <li>util.jsonNormalize(elementId, json) -> jsonString</li>
 * </ul>
 */
public final class UtilTable extends ScriptTable {

    public UtilTable() {
        super("util");
    }

    @Override
    protected void define(HostServices services) {
        UtilHost host = services.util().orElseThrow(() -> new IllegalStateException("UtilHost not provided"));

        table().set("base64Encode", new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue text) {
                return LuaValue.valueOf(host.base64Encode(text.isnil() ? "" : text.tojstring()));
            }
        });

        table().set("base64Decode", new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue b64) {
                return LuaValue.valueOf(host.base64Decode(b64.isnil() ? "" : b64.tojstring()));
            }
        });

        table().set("randomHex", new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue bytes) {
                return LuaValue.valueOf(host.randomHex(bytes.checkint()));
            }
        });

        table().set("parseUrl", new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue url) {
                return JavaToLua.coerce(host.parseUrl(url.checkjstring()));
            }
        });

        table().set("parseQuery", new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue q) {
                return JavaToLua.coerce(host.parseQuery(q.isnil() ? "" : q.tojstring()));
            }
        });

        table().set("jsonStringifyExpr", new TwoArgFunction() {
            @Override
            public LuaValue call(LuaValue elementId, LuaValue jsExpr) {
                return LuaValue.valueOf(host.jsonStringifyExpr(elementId.checkjstring(), jsExpr.checkjstring()));
            }
        });

        table().set("jsonNormalize", new TwoArgFunction() {
            @Override
            public LuaValue call(LuaValue elementId, LuaValue json) {
                return LuaValue.valueOf(host.jsonNormalize(elementId.checkjstring(), json.checkjstring()));
            }
        });
    }
}