/* This is a first attempt in implementation of plugins to Trisurf-ng. */

/*
1. Capabilities of Plugin
-------------------------

Every plugin should list it's capabilities -- that is what subrutines are available in it. Capabilities list for the moment are:

* PLUGIN_PROGRAM_START (requires subrutine void at_start(void)): runs at startup
* PLUGIN_VESICLE_INITIALIZED (requires subrutine void after_vesicle_init(vesicle *vesicle):
	runs after vesicle gets initialized.

* PLUGIN_VERTEX_MOVE (requires subrutines:

	ts_bool vm_hard_constraint(vesicle *vesicle, vtx *vtx, vtx *old_vtx)
	ts_double vm_energy_before(vesicle *vesicle, vtx *vtx)
	ts_double vm_energy_after(vesicle *vesicle, vtx *vtx)
	ts_double vm_new_state_accepted(vesicle *vesicle, vtx *vtx)
	ts_double vm_new_state_rejected(vesicle *vesicle, vtx *vtx)

	)

	these subrutines are added into the vertex move into right places

* PLUGIN_BOND_FLIP ( N/A yet)
*/
#include "plugins.h"
#include <stdlib.h>
#include <dlfcn.h>
#include <string.h>
#include "general.h"

ts_plugin *init_plugin(ts_char *filename){
	ts_plugin *plugin = (ts_plugin *)calloc(1, sizeof(ts_plugin));
	plugin->filename=(ts_char *)calloc(strlen(filename),sizeof(ts_char));
	strcpy(plugin->filename,filename);
	plugin->libhandle = dlopen(plugin->filename, RTLD_NOW);
	if(!plugin->libhandle){
		ts_fprintf(stderr,"Error loading plugin: %s\n", filename);
		fatal("Exiting",235);
	}
	ts_plugin_details* (*get_plugin_details)(void) = dlsym(plugin->libhandle, "init");
	plugin->details = get_plugin_details();
	plugin->function = (ts_plugin_function *)calloc(1,sizeof(ts_plugin_function));
	
	plugin->function->cleanup = dlsym(plugin->libhandle, "cleanup");
	plugin->function->at_start = dlsym(plugin->libhandle, "at_start");
	plugin->function->after_vesicle_init = dlsym(plugin->libhandle, "after_vesicle_init");
	plugin->function->vm_hard_constraint = dlsym(plugin->libhandle, "vm_hard_constraint");
	plugin->function->vm_energy_before = dlsym(plugin->libhandle, "vm_energy_before");
	plugin->function->vm_energy_after = dlsym(plugin->libhandle, "vm_energy_after");
	plugin->function->vm_new_state_rejected = dlsym(plugin->libhandle, "vm_new_state_rejected");
	plugin->function->vm_new_state_accepted = dlsym(plugin->libhandle, "vm_new_state_accepted");

	return plugin;
}


ts_plugin_list *init_plugin_list(ts_char **plugin_filenames, ts_uint number_of_plugins){
	ts_plugin_list *plist=(ts_plugin_list *)calloc(1, sizeof(ts_plugin_list));
	plist->plugin=(ts_plugin **)calloc(number_of_plugins, sizeof(ts_plugin *));
	for(int i=0;i<number_of_plugins;i++){
		plist->plugin[i]=init_plugin(plugin_filenames[i]);
	}
	return plist;
}	

void free_plugin(ts_plugin *plugin){
	plugin->function->cleanup();
	free(plugin->function);
	free(plugin->details);
	free(plugin->filename);
	dlclose(plugin->libhandle);
	free(plugin);
}

void free_plugin_list(ts_plugin_list *plist){
	for(int i=0;i<plist->n;i++){
		free_plugin(plist->plugin[i]);
	}
	free(plist);
}