package org.openautonomousconnection.luascript.tables;

import org.luaj.vm2.LuaValue;
import org.luaj.vm2.Varargs;
import org.luaj.vm2.libs.VarArgFunction;
import org.luaj.vm2.libs.ZeroArgFunction;
import org.openautonomousconnection.luascript.hosts.HostServices;
import org.openautonomousconnection.luascript.hosts.VideoHost;
import org.openautonomousconnection.luascript.utils.ScriptTable;

import java.io.File;

/**
 * Lua table: video
 *
 * <p>Functions:</p>
 * <ul>
 *   <li>video.play(pathOrUrl)</li>
 *   <li>video.pause()</li>
 *   <li>video.resume()</li>
 *   <li>video.stop()</li>
 *   <li>video.hide()</li>
 *   <li>video.rect(x, y, w, h)</li>
 *   <li>video.volume(v)</li>
 *   <li>video.loop(boolean)</li>
 *   <li>video.seek(seconds)</li>
 * </ul>
 */
public final class VideoTable extends ScriptTable {

    public VideoTable() {
        super("video");
    }

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

        table().set("play", new VarArgFunction() {
            @Override
            public Varargs invoke(Varargs args) {
                String src = args.arg(1).checkjstring();
                if (looksLikeUrl(src)) host.playUrl(src);
                else host.playFile(new File(src));
                return LuaValue.NIL;
            }
        });

        table().set("pause", new ZeroArgFunction() {
            @Override
            public LuaValue call() {
                host.pause();
                return LuaValue.NIL;
            }
        });

        table().set("resume", new ZeroArgFunction() {
            @Override
            public LuaValue call() {
                host.resume();
                return LuaValue.NIL;
            }
        });

        table().set("stop", new ZeroArgFunction() {
            @Override
            public LuaValue call() {
                host.stop();
                return LuaValue.NIL;
            }
        });

        table().set("hide", new ZeroArgFunction() {
            @Override
            public LuaValue call() {
                host.hide();
                return LuaValue.NIL;
            }
        });

        table().set("rect", new VarArgFunction() {
            @Override
            public Varargs invoke(Varargs args) {
                double x = args.arg(1).checkdouble();
                double y = args.arg(2).checkdouble();
                double w = args.arg(3).checkdouble();
                double h = args.arg(4).checkdouble();
                host.setRect(x, y, w, h);
                return LuaValue.NIL;
            }
        });

        table().set("volume", new VarArgFunction() {
            @Override
            public Varargs invoke(Varargs args) {
                double v = args.arg(1).checkdouble();
                host.setVolume(v);
                return LuaValue.NIL;
            }
        });

        table().set("loop", new VarArgFunction() {
            @Override
            public Varargs invoke(Varargs args) {
                boolean b = args.arg(1).checkboolean();
                host.setLoop(b);
                return LuaValue.NIL;
            }
        });

        table().set("seek", new VarArgFunction() {
            @Override
            public Varargs invoke(Varargs args) {
                double s = args.arg(1).checkdouble();
                host.seek(s);
                return LuaValue.NIL;
            }
        });
    }

    private static boolean looksLikeUrl(String s) {
        if (s == null) return false;
        int idx = s.indexOf("://");
        return idx > 0 && idx < 16;
    }
}