/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"

#include "httpd.h"

#include "apr_thread_rwlock.h"
#include "apr_strings.h"
#include "apr_tables.h"
#include "apr_hash.h"
#include "apr_buckets.h"
#include "apr_file_info.h"
#include "apr_time.h"
#include "apr_pools.h"


#ifndef VMPREP_H
#define VMPREP_H

#define APW_CODE_CACHE_STAT     1
#define APW_CODE_CACHE_FOREVER  2
#define APW_CODE_CACHE_NEVER    3

#define APW_SCOPE_ONCE          1
#define APW_SCOPE_REQUEST       2
#define APW_SCOPE_CONN          3
#define APW_SCOPE_SERVER        4

/**
 * Specification for a lua virtual machine
 */ 
typedef struct {

    // NEED TO ADD ADDITIONAL PACKAGE PATHS AS PART OF SPEC INSTEAD OF DIR CONFIG
    apr_array_header_t* package_paths;
    apr_array_header_t* package_cpaths;
    
    // name of base file to load in the vm
    const char *file;             

    // APW_CODE_CACHE_STAT | APW_CODE_CACHE_FOREVER | APW_CODE_CACHE_NEVER
    int code_cache_style;

    // APW_SCOPE_ONCE | APW_SCOPE_REQUEST | APW_SCOPE_CONN | APW_SCOPE_SERVER
    int scope;
    
    // pool to use for lifecycle if APW_SCOPE_ONCE is set, otherwise unused
    apr_pool_t *pool;
} apw_vm_spec;

typedef struct {
    int code_cache_style;
    char *function_name;
    char *file_name;
    int scope;
    ap_regex_t *uri_pattern;
} apw_mapped_handler_spec;

typedef struct {
    apr_pool_t *pool;
    apr_hash_t *compiled_files;
    apr_thread_rwlock_t* compiled_files_lock;
} apw_code_cache;

// remove and make static once out of mod_wombat.c
void apw_openlibs(lua_State* L);

// remove and make static once out of mod_wombat.c
void apw_registerlib(lua_State* L, char* name, lua_CFunction f);

/**
 * Fake out addition of the "apache2" module
 */
void apw_load_apache2_lmodule(lua_State *L);

/**
 * the apw_?getvm family of functions is used to create and/or obtain
 * a handle to a lua state. If there is not an extant vm matching the
 * spec then a new one is created.
 */
lua_State* apw_rgetvm(request_rec *r, apw_vm_spec *spec);

// returns NULL if the spec requires a request scope
lua_State* apw_cgetvm(conn_rec *r, apw_vm_spec *spec);

// returns NULL if the spec requires a request scope or conn scope
lua_State* apw_sgetvm(server_rec *r, apw_vm_spec *spec);

#endif