#include "dialog.h"

struct HELP_CONTEXT_PRIVATE{
	SSTRING title;
	HELP_FILE *help;
	int threadid;
	HELP_CONTEXT_PRIVATE(const char *_title, const char *subdir, const char *file)
	{
		help = new HELP_FILE (subdir,file);
		title.setfrom (_title);
		threadid = uithread_id;
	}
	~HELP_CONTEXT_PRIVATE ()
	{
		delete help;
	}
};
		
static ARRAY_OBJS<HELP_CONTEXT> tb;

PUBLIC HELP_CONTEXT::HELP_CONTEXT(const char *title, const char *subdir, const char *file)
{
	priv = new HELP_CONTEXT_PRIVATE(title,subdir,file);
	tb.add (this);
	tb.neverdelete();
}

PUBLIC HELP_CONTEXT::~HELP_CONTEXT()
{
	delete priv;
	tb.remove (this);
}

/*
	Setup all the alternate help for a dialog.
	Pick the various HELP_CONTEXT object in the stack for this
	thread.
*/
void help_context_setalthelp (DIALOG *dia)
{
	// Help are presented in reverse order
	// The last registered HELP_CONTEXT is presented first
	int id = uithread_id;
	for (int i=tb.getnb()-1; i>=0; i--){
		HELP_CONTEXT_PRIVATE *priv = tb.getitem(i)->priv;
		if (priv->threadid == id){
			if (priv->title.is_filled()){
				dia->addhelp (*priv->help,priv->title.get());
			}else{
				// Ok, this is the first dummy HELP_CONTEXT of this
				// thread. We must now look at HELP_CONTEXT defined
				// by the parent before this thread started
				id = uithread_getparent(id);
			}
		}
	}
}

/*
	Create a marker to tell where the HELP_CONTEXT for a given
	threadid starts.

	This way, help_context_setalthelp() can pick the HELP_CONTEXT
	for the current thread, then switch to the parent thread and pick
	only the HELP_CONTEXT defined before the child thread was created.

	This function is only called from uithread()
	and help_context_delmark is called when the thread ends.
*/
void help_context_setmark (int threadid)
{
	HELP_CONTEXT *h = new HELP_CONTEXT ("","","");
	h->priv->threadid = threadid;
}

void help_context_delmark (int threadid)
{
	for (int i=0; i<tb.getnb(); i++){
		HELP_CONTEXT *h = tb.getitem(i);
		HELP_CONTEXT_PRIVATE *priv = h->priv;
		if (priv->title.is_empty() && priv->threadid == threadid){
			tb.remove(h);
			delete h;
			break;
		}
	}
}