/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2006, Digium, Inc.
 *
 * Steve Murphy <murf@parsetree.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Compile symbolic Asterisk Extension Logic into Asterisk extensions, version 2.
 *
 */

/*** MODULEINFO
	<depend>res_ael_share</depend>
	<defaultenabled>no</defaultenabled>
	<support_level>extended</support_level>
 ***/

#include "asterisk.h"

#include <ctype.h>
#include <regex.h>
#include <sys/stat.h>

#include "asterisk/pbx.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/logger.h"
#include "asterisk/cli.h"
#include "asterisk/app.h"
#include "asterisk/callerid.h"
#include "asterisk/hashtab.h"
#include "asterisk/ael_structs.h"
#include "asterisk/pval.h"
#ifdef AAL_ARGCHECK
#include "asterisk/argdesc.h"
#endif

/*** DOCUMENTATION
	<application name="AELSub" language="en_US">
		<synopsis>
			Launch subroutine built with AEL
		</synopsis>
		<syntax>
			<parameter name="routine" required="true">
				<para>Named subroutine to execute.</para>
			</parameter>
			<parameter name="args" required="false" />
		</syntax>
		<description>
			<para>Execute the named subroutine, defined in AEL, from another dialplan
			language, such as extensions.conf, Realtime extensions, or Lua.</para>
			<para>The purpose of this application is to provide a sane entry point into
			AEL subroutines, the implementation of which may change from time to time.</para>
		</description>
	</application>
 ***/

/* these functions are in ../ast_expr2.fl */

#define DEBUG_READ   (1 << 0)
#define DEBUG_TOKENS (1 << 1)
#define DEBUG_MACROS (1 << 2)
#define DEBUG_CONTEXTS (1 << 3)

static char *config = "extensions.ael";
static char *registrar = "pbx_ael";
static int pbx_load_module(void);

#ifndef AAL_ARGCHECK
/* for the time being, short circuit all the AAL related structures
   without permanently removing the code; after/during the AAL
   development, this code can be properly re-instated
*/

#endif

#ifdef AAL_ARGCHECK
int option_matches_j( struct argdesc *should, pval *is, struct argapp *app);
int option_matches( struct argdesc *should, pval *is, struct argapp *app);
int ael_is_funcname(char *name);
#endif

int check_app_args(pval *appcall, pval *arglist, struct argapp *app);
void check_pval(pval *item, struct argapp *apps, int in_globals);
void check_pval_item(pval *item, struct argapp *apps, int in_globals);
void check_switch_expr(pval *item, struct argapp *apps);
void ast_expr_register_extra_error_info(char *errmsg);
void ast_expr_clear_extra_error_info(void);
struct pval *find_macro(char *name);
struct pval *find_context(char *name);
struct pval *find_context(char *name);
struct pval *find_macro(char *name);
struct ael_priority *new_prio(void);
struct ael_extension *new_exten(void);
void destroy_extensions(struct ael_extension *exten);
void set_priorities(struct ael_extension *exten);
void add_extensions(struct ael_extension *exten);
int ast_compile_ael2(struct ast_context **local_contexts, struct ast_hashtab *local_table, struct pval *root);
void destroy_pval(pval *item);
void destroy_pval_item(pval *item);
int is_float(char *arg );
int is_int(char *arg );
int is_empty(char *arg);

/* static void substitute_commas(char *str); */

static int aeldebug = 0;

/* interface stuff */

#ifndef STANDALONE
static char *aelsub = "AELSub";

static int aelsub_exec(struct ast_channel *chan, const char *vdata)
{
	char buf[256], *data = ast_strdupa(vdata);
	struct ast_app *gosub = pbx_findapp("Gosub");
	AST_DECLARE_APP_ARGS(args,
		AST_APP_ARG(name);
		AST_APP_ARG(args);
	);

	if (gosub) {
		AST_STANDARD_RAW_ARGS(args, data);
		snprintf(buf, sizeof(buf), "%s,~~s~~,1(%s)", args.name, args.args);
		return pbx_exec(chan, gosub, buf);
	}
	return -1;
}
#endif

/* if all the below are static, who cares if they are present? */

static int pbx_load_module(void)
{
	int errs=0, sem_err=0, sem_warn=0, sem_note=0;
	char *rfilename;
	struct ast_context *local_contexts=NULL, *con;
	struct ast_hashtab *local_table=NULL;

	struct pval *parse_tree;

	ast_debug(1, "Starting AEL load process.\n");
	if (config[0] == '/')
		rfilename = (char *)config;
	else {
		rfilename = ast_alloca(strlen(config) + strlen(ast_config_AST_CONFIG_DIR) + 2);
		sprintf(rfilename, "%s/%s", ast_config_AST_CONFIG_DIR, config);
	}
	if (access(rfilename,R_OK) != 0) {
		ast_log(LOG_NOTICE, "File %s not found; AEL declining load\n", rfilename);
		return AST_MODULE_LOAD_DECLINE;
	}

	parse_tree = ael2_parse(rfilename, &errs);
	ast_debug(1, "AEL load process: parsed config file name '%s'.\n", rfilename);
	ael2_semantic_check(parse_tree, &sem_err, &sem_warn, &sem_note);
	if (errs == 0 && sem_err == 0) {
		ast_debug(1, "AEL load process: checked config file name '%s'.\n", rfilename);
		local_table = ast_hashtab_create(11, ast_hashtab_compare_contexts, ast_hashtab_resize_java, ast_hashtab_newsize_java, ast_hashtab_hash_contexts, 0);
		if (ast_compile_ael2(&local_contexts, local_table, parse_tree)) {
			ast_log(LOG_ERROR, "AEL compile failed! Aborting.\n");
			destroy_pval(parse_tree); /* free up the memory */
			return AST_MODULE_LOAD_DECLINE;
		}
		ast_debug(1, "AEL load process: compiled config file name '%s'.\n", rfilename);

		ast_merge_contexts_and_delete(&local_contexts, local_table, registrar);
		local_table = NULL; /* it's the dialplan global now */
		local_contexts = NULL;
		ast_debug(1, "AEL load process: merged config file name '%s'.\n", rfilename);
		for (con = ast_walk_contexts(NULL); con; con = ast_walk_contexts(con))
			ast_context_verify_includes(con);
		ast_debug(1, "AEL load process: verified config file name '%s'.\n", rfilename);
	} else {
		ast_log(LOG_ERROR, "Sorry, but %d syntax errors and %d semantic errors were detected. It doesn't make sense to compile.\n", errs, sem_err);
		destroy_pval(parse_tree); /* free up the memory */
		return AST_MODULE_LOAD_DECLINE;
	}
	destroy_pval(parse_tree); /* free up the memory */

	return AST_MODULE_LOAD_SUCCESS;
}

/* CLI interface */
static char *handle_cli_ael_set_debug(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
	switch (cmd) {
	case CLI_INIT:
		e->command = "ael set debug {read|tokens|macros|contexts|off}";
		e->usage =
			"Usage: ael set debug {read|tokens|macros|contexts|off}\n"
			"       Enable AEL read, token, macro, or context debugging,\n"
			"       or disable all AEL debugging messages.  Note: this\n"
			"       currently does nothing.\n";
		return NULL;
	case CLI_GENERATE:
		return NULL;
	}

	if (a->argc != e->args)
		return CLI_SHOWUSAGE;

	if (!strcasecmp(a->argv[3], "read"))
		aeldebug |= DEBUG_READ;
	else if (!strcasecmp(a->argv[3], "tokens"))
		aeldebug |= DEBUG_TOKENS;
	else if (!strcasecmp(a->argv[3], "macros"))
		aeldebug |= DEBUG_MACROS;
	else if (!strcasecmp(a->argv[3], "contexts"))
		aeldebug |= DEBUG_CONTEXTS;
	else if (!strcasecmp(a->argv[3], "off"))
		aeldebug = 0;
	else
		return CLI_SHOWUSAGE;

	return CLI_SUCCESS;
}

static char *handle_cli_ael_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
	switch (cmd) {
	case CLI_INIT:
		e->command = "ael reload";
		e->usage =
			"Usage: ael reload\n"
			"       Reloads AEL configuration.\n";
		return NULL;
	case CLI_GENERATE:
		return NULL;
	}

	if (a->argc != 2)
		return CLI_SHOWUSAGE;

#ifndef STANDALONE
	/* Lock-Protected reload.  It is VERY BAD to have simultaneous ael load_module() executing at the same time */
	return ast_module_reload("pbx_ael") == AST_MODULE_RELOAD_SUCCESS ? CLI_SUCCESS : CLI_FAILURE;
#else
	/* Lock-Protected reload not needed (and not available) when running standalone (Example: via aelparse cli tool).  No reload contention is possible */
	return (pbx_load_module() ? CLI_FAILURE : CLI_SUCCESS);
#endif
}

static struct ast_cli_entry cli_ael[] = {
	AST_CLI_DEFINE(handle_cli_ael_reload,    "Reload AEL configuration"),
	AST_CLI_DEFINE(handle_cli_ael_set_debug, "Enable AEL debugging flags")
};

static int unload_module(void)
{
	ast_context_destroy(NULL, registrar);
	ast_cli_unregister_multiple(cli_ael, ARRAY_LEN(cli_ael));
#ifndef STANDALONE
	ast_unregister_application(aelsub);
#endif
	return 0;
}

static int load_module(void)
{
	ast_cli_register_multiple(cli_ael, ARRAY_LEN(cli_ael));
#ifndef STANDALONE
	ast_register_application_xml(aelsub, aelsub_exec);
#endif
	return (pbx_load_module());
}

static int reload(void)
{
	/* Lock-Protected reload not needed because we're already being called from ast_module_reload() */
	return pbx_load_module();
}

#ifdef STANDALONE
#define AST_MODULE "ael"
int ael_external_load_module(void);
int ael_external_load_module(void)
{
        pbx_load_module();
        return 1;
}
#endif

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Asterisk Extension Language Compiler",
	.support_level = AST_MODULE_SUPPORT_EXTENDED,
	.load = load_module,
	.unload = unload_module,
	.reload = reload,
	.requires = "res_ael_share",
);

#ifdef AAL_ARGCHECK
static const char * const ael_funclist[] =
{
	"AGENT",
	"ARRAY",
	"BASE64_DECODE",
	"BASE64_ENCODE",
	"CALLERID",
	"CDR",
	"CHANNEL",
	"CHECKSIPDOMAIN",
	"CHECK_MD5",
	"CURL",
	"CUT",
	"DB",
	"DB_EXISTS",
	"DUNDILOOKUP",
	"ENUMLOOKUP",
	"ENV",
	"EVAL",
	"EXISTS",
	"FIELDQTY",
	"FILTER",
	"GROUP",
	"GROUP_COUNT",
	"GROUP_LIST",
	"GROUP_MATCH_COUNT",
	"IAXPEER",
	"IF",
	"IFTIME",
	"ISNULL",
	"KEYPADHASH",
	"LANGUAGE",
	"LEN",
	"MATH",
	"MD5",
	"MUSICCLASS",
	"QUEUEAGENTCOUNT",
	"QUEUE_MEMBER_COUNT",
	"QUEUE_MEMBER_LIST",
	"QUOTE",
	"RAND",
	"REGEX",
	"SET",
	"SHA1",
	"SIPCHANINFO",
	"SIPPEER",
	"SIP_HEADER",
	"SORT",
	"STAT",
	"STRFTIME",
	"STRPTIME",
	"TIMEOUT",
	"TXTCIDNAME",
	"URIDECODE",
	"URIENCODE",
	"VMCOUNT"
};


int ael_is_funcname(char *name)
{
	int s,t;
	t = sizeof(ael_funclist)/sizeof(char*);
	s = 0;
	while ((s < t) && strcasecmp(name, ael_funclist[s]))
		s++;
	if ( s < t )
		return 1;
	else
		return 0;
}
#endif
