#ifndef NEXUS_LUA_H
#define NEXUS_LUA_H

/**
 * @file
 *
 * Defines the lua environment for use with nexus
 */
struct nexus_lua;

#include "nexus.h"

#include <lua5.1/lua.h>

/**
 * The global lua state
 */
struct nexus_lua {
    /** The nexus we are operating on */
    struct nexus *nexus;

    /** The main lua state */
    lua_State *st;
};

/**
 * Create a new lua state for nexus
 */
err_t nexus_lua_create (struct nexus_lua **lua_ptr, struct nexus *nexus, struct error_info *err);

/**
 * Destroy the lua state
 */
void nexus_lua_destroy (struct nexus_lua *lua);

/**
 * Parse and execute the given lua chunk in the nexus's lua context.
 *
 * This operation is equally valid for both textual and binary chunks, but this is intended for textual chunks, and
 * hence accepts a NUL-terminated string.
 *
 * This runs the chunk in the main lua state, so this will fail for any coroutine functions.
 */
err_t nexus_lua_eval (struct nexus_lua *lua, const char *chunk, error_t *err);

/**
 * Handle a Lua error by converting the given error code into a ERR_LUA_* code, inspecting the error object at
 * the top of the stack.
 *
 * Please note that the resulting error_info points into strings inside the lua stack - once you pop the error, the
 * error_info might not be valid anymore after the next GC cycle.
 */
err_t nexus_lua_error (lua_State *L, int ret, error_t *err);

#endif /* NEXUS_LUA_H */