module resourcemanager;

import std.file;

class ResourceManager{
    /**
        Add a resource to the manager
    */
    void AddRes(T)(in string sName, ref T res){
        TypeInfo ti = typeid(T);
        if(!(ti in m_loadedRes && sName in m_loadedRes[ti]))
            m_loadedRes[typeid(T)][sName] = res;
    }

    /**
        Gets the resource with its name
    */
    ref T Get(T)(string sName){
        TypeInfo ti = typeid(T);
        if(ti in m_loadedRes && sName in m_loadedRes[ti]){
            return *(cast(T*)&(m_loadedRes[ti][sName]));
        }
        throw new Exception("Resource '"~sName~"' not found");
    }

    /**
        Loads the resources contained in directory matching filePatern
        The first argument of the resource constructor must be a DirEntry, followed by any arguments provided with ctorArgs
    */
    void LoadFromFiles(T, VT...)(in string directory, in string filePatern, in bool recursive, VT ctorArgs){
        foreach(ref file ; dirEntries(directory, filePatern, recursive?SpanMode.depth:SpanMode.shallow)){
            if(file.isFile){
                AddRes!T(file.name, new T(file, ctorArgs));
            }
        }
    }

private:
    Object[string][TypeInfo] m_loadedRes;
}

version( unittest )
class Foo{
    this(){}
    this(DirEntry file, int i){s = file.name;}
    string s = "goto bar";
}

unittest {

    auto rm = new ResourceManager;

    auto foo = new Foo;
    rm.AddRes!Foo("yolo", foo);

    assert(rm.Get!Foo("yolo") == foo);
    assert(rm.Get!Foo("yolo") is foo);

    rm.LoadFromFiles!Foo(".", "dub.json", true, 5);
}