module cm3d2.menu;

import std.bitmanip;
import std.conv;
import std.math;

class Menu
{
    uint fileVersion;
    string path;

    string name;
    string category;
    string description;

    string[][] lines;

    public static Menu fromSDL(string sdl)
    {
        throw new Exception("Not implemented yet");
    }

    public static Menu fromMenu(ubyte[] data)
    {
        auto menu = new Menu();

		ubyte readByte()
		{
			auto value = data[0];
			data = data[1 .. $];
			return value;
		}

		string readString()
		{
            auto length = 0;
            ubyte[] chars;

            while (true)
            {
                auto lengthByte = readByte();

                if (length != 0 && lengthByte < 128)
                {
                    break;
                }

                length = length << 8 | lengthByte;

                if (lengthByte < 128)
                {
                    break;
                }
            }

			auto value = cast(string) data[0 .. length];
			data = data[length .. $];

			return value;
		}

        uint readInt()
        {
            auto value = littleEndianToNative!uint(data[0 .. 4]);
            data = data[4 .. $];
            return value;
        }

        assert(readString() == "CM3D2_MENU", "Not a valid .menu file");

		menu.fileVersion = readInt();
        menu.path = readString();
        menu.name = readString();
        menu.category = readString();
        menu.description = readString();

        assert(readInt() == data.length, "Unexpected data at end of file");

        while(data.length > 0)
        {
            string[] line;

            foreach (_; 0 .. readByte())
            {
                line ~= readString();
            }

            menu.lines ~= line;
        }

        std.stdio.writeln(menu.lines);

        return menu;
    }

    public string toMenu()
    {
        throw new Exception("Not implemented yet");
    }

    public string toSDL()
    {
        throw new Exception("Not implemented yet");
    }
}