/**
 * Copyright (C) 2010-2016 Daniel-Constantin Mierla (asipto.com)
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * Kamailio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

#include "../../core/sr_module.h"
#include "../../core/dprint.h"
#include "../../core/ut.h"
#include "../../core/mod_fix.h"
#include "../../core/kemi.h"

#include "app_lua_api.h"
#include "app_lua_kemi_export.h"

MODULE_VERSION

/** parameters */

/* List of allowed chars for a prefix*/
static int mod_init(void);
static void mod_destroy(void);
static int child_init(int rank);

static int w_app_lua_dostring(struct sip_msg *msg, char *script, char *extra);
static int w_app_lua_dofile(struct sip_msg *msg, char *script, char *extra);
static int w_app_lua_runstring(struct sip_msg *msg, char *script, char *extra);
static int w_app_lua_run(
		struct sip_msg *msg, char *func, char *p1, char *p2, char *p3);
static int w_app_lua_run0(
		struct sip_msg *msg, char *func, char *p1, char *p2, char *p3);
static int w_app_lua_run1(
		struct sip_msg *msg, char *func, char *p1, char *p2, char *p3);
static int w_app_lua_run2(
		struct sip_msg *msg, char *func, char *p1, char *p2, char *p3);
static int w_app_lua_run3(
		struct sip_msg *msg, char *func, char *p1, char *p2, char *p3);

static int fixup_lua_run(void **param, int param_no);

int app_lua_load_param(modparam_t type, void *val);
int app_lua_reload_param(modparam_t type, void *val);

int _ksr_app_lua_log_mode = 0;

/* clang-format off */
static param_export_t params[] = {
	{"load", PARAM_STRING | PARAM_USE_FUNC, (void *)app_lua_load_param},
	{"reload", PARAM_INT | PARAM_USE_FUNC, (void *)app_lua_reload_param},
	{"log_mode", PARAM_INT, &_ksr_app_lua_log_mode},
	{0, 0, 0}
};

static cmd_export_t cmds[] = {
	{"lua_dostring", (cmd_function)w_app_lua_dostring, 1,
		fixup_spve_null, 0, ANY_ROUTE},
	{"lua_dofile", (cmd_function)w_app_lua_dofile, 1,
		fixup_spve_null, 0, ANY_ROUTE},
	{"lua_runstring", (cmd_function)w_app_lua_runstring, 1,
		fixup_spve_null, 0, ANY_ROUTE},
	{"lua_run", (cmd_function)w_app_lua_run0, 1,
		fixup_lua_run, 0, ANY_ROUTE},
	{"lua_run", (cmd_function)w_app_lua_run1, 2,
		fixup_lua_run, 0, ANY_ROUTE},
	{"lua_run", (cmd_function)w_app_lua_run2, 3,
		fixup_lua_run, 0, ANY_ROUTE},
	{"lua_run", (cmd_function)w_app_lua_run3, 4,
		fixup_lua_run, 0, ANY_ROUTE},
	{"bind_app_lua", (cmd_function)bind_app_lua, 0,
		0, 0, ANY_ROUTE},
	{0, 0, 0, 0, 0, 0}
};

#ifndef MOD_NAME
#define MOD_NAME "app_lua"
#endif

struct module_exports _app_lua_exports = {
	MOD_NAME,					/* module name */
	DEFAULT_DLFLAGS,			/* dlopen flags */
	cmds,						/* exported functions */
	params,						/* exported params */
	0,							/* exported RPC methods */
	0,							/* exported pseudo-variables */
	0,							/* response function */
	mod_init,					/* initialization module */
	child_init,					/* per child init function */
	mod_destroy					/* destroy function */
};
/* clang-format on */

/**
 *
 */
int sr_kemi_config_engine_lua(
		sip_msg_t *msg, int rtype, str *rname, str *rparam)
{
	int ret;

	ret = -1;
	if(rtype == REQUEST_ROUTE) {
		if(rname != NULL && rname->s != NULL) {
			ret = app_lua_run_ex(msg, rname->s,
					(rparam && rparam->s) ? rparam->s : NULL, NULL, NULL, 0);
		} else {
			ret = app_lua_run_ex(
					msg, kemi_request_route_callback.s, NULL, NULL, NULL, 1);
		}
	} else if(rtype == CORE_ONREPLY_ROUTE) {
		if(kemi_reply_route_callback.len > 0) {
			ret = app_lua_run_ex(
					msg, kemi_reply_route_callback.s, NULL, NULL, NULL, 0);
		}
	} else if(rtype == BRANCH_ROUTE) {
		if(rname != NULL && rname->s != NULL) {
			ret = app_lua_run_ex(msg, rname->s, NULL, NULL, NULL, 0);
		}
	} else if(rtype == FAILURE_ROUTE) {
		if(rname != NULL && rname->s != NULL) {
			ret = app_lua_run_ex(msg, rname->s, NULL, NULL, NULL, 0);
		}
	} else if(rtype == BRANCH_FAILURE_ROUTE) {
		if(rname != NULL && rname->s != NULL) {
			ret = app_lua_run_ex(msg, rname->s, NULL, NULL, NULL, 0);
		}
	} else if(rtype == TM_ONREPLY_ROUTE) {
		if(rname != NULL && rname->s != NULL) {
			ret = app_lua_run_ex(msg, rname->s, NULL, NULL, NULL, 0);
		}
	} else if(rtype == ONSEND_ROUTE) {
		if(kemi_onsend_route_callback.len > 0) {
			ret = app_lua_run_ex(
					msg, kemi_onsend_route_callback.s, NULL, NULL, NULL, 0);
		}
		return 1;
	} else if(rtype == EVENT_ROUTE) {
		if(rname != NULL && rname->s != NULL) {
			ret = app_lua_run_ex(msg, rname->s,
					(rparam && rparam->s) ? rparam->s : NULL, NULL, NULL, 0);
		}
	} else {
		if(rname != NULL) {
			LM_ERR("route type %d with name [%.*s] not implemented\n", rtype,
					rname->len, rname->s);
		} else {
			LM_ERR("route type %d with no name not implemented\n", rtype);
		}
	}

	if(rname != NULL) {
		LM_DBG("execution of route type %d with name [%.*s] returned %d\n",
				rtype, rname->len, rname->s, ret);
	} else {
		LM_DBG("execution of route type %d with no name returned %d\n", rtype,
				ret);
	}

	return 1;
}


/**
 * init module function
 */
static int mod_init(void)
{
	if(lua_sr_init_mod() < 0) {
		return -1;
	}

	if(app_lua_init_rpc() < 0) {
		LM_ERR("failed to register RPC commands\n");
		return -1;
	}
	return 0;
}


/* each child get a new connection to the database */
static int child_init(int rank)
{
	if(rank == PROC_MAIN || rank == PROC_TCP_MAIN)
		return 0; /* do nothing for the main process */

	return lua_sr_init_child();
}


static void mod_destroy(void)
{
	lua_sr_destroy();
}

#define LUA_BUF_STACK_SIZE 1024
static char _lua_buf_stack[4][LUA_BUF_STACK_SIZE];

/**
 *
 */
static int ki_app_lua_dostring(sip_msg_t *msg, str *script)
{
	if(script == NULL || script->s == NULL
			|| script->len >= LUA_BUF_STACK_SIZE - 1) {
		LM_ERR("script too short or too long %d\n", (script) ? script->len : 0);
		return -1;
	}
	if(!lua_sr_initialized()) {
		LM_ERR("Lua env not initialized");
		return -1;
	}
	memcpy(_lua_buf_stack[0], script->s, script->len);
	_lua_buf_stack[0][script->len] = '\0';
	return app_lua_dostring(msg, _lua_buf_stack[0]);
}

/**
 *
 */
static int w_app_lua_dostring(struct sip_msg *msg, char *script, char *extra)
{
	str s;

	if(fixup_get_svalue(msg, (gparam_p)script, &s) < 0) {
		LM_ERR("cannot get the script\n");
		return -1;
	}
	return ki_app_lua_dostring(msg, &s);
}

/**
 *
 */
static int ki_app_lua_dofile(sip_msg_t *msg, str *script)
{
	if(script == NULL || script->s == NULL
			|| script->len >= LUA_BUF_STACK_SIZE - 1) {
		LM_ERR("script too short or too long %d\n", (script) ? script->len : 0);
		return -1;
	}
	if(!lua_sr_initialized()) {
		LM_ERR("Lua env not initialized");
		return -1;
	}
	memcpy(_lua_buf_stack[0], script->s, script->len);
	_lua_buf_stack[0][script->len] = '\0';
	return app_lua_dofile(msg, _lua_buf_stack[0]);
}

/**
 *
 */
static int w_app_lua_dofile(struct sip_msg *msg, char *script, char *extra)
{
	str s;
	if(fixup_get_svalue(msg, (gparam_p)script, &s) < 0) {
		LM_ERR("cannot get the script\n");
		return -1;
	}
	return ki_app_lua_dofile(msg, &s);
}

/**
 *
 */
static int ki_app_lua_runstring(sip_msg_t *msg, str *script)
{
	if(script == NULL || script->s == NULL
			|| script->len >= LUA_BUF_STACK_SIZE - 1) {
		LM_ERR("script too short or too long %d\n", (script) ? script->len : 0);
		return -1;
	}
	if(!lua_sr_initialized()) {
		LM_ERR("Lua env not initialized");
		return -1;
	}
	memcpy(_lua_buf_stack[0], script->s, script->len);
	_lua_buf_stack[0][script->len] = '\0';
	return app_lua_runstring(msg, _lua_buf_stack[0]);
}

/**
 *
 */
static int w_app_lua_runstring(struct sip_msg *msg, char *script, char *extra)
{
	str s;
	if(!lua_sr_initialized()) {
		LM_ERR("Lua env not initialized");
		return -1;
	}
	if(fixup_get_svalue(msg, (gparam_p)script, &s) < 0) {
		LM_ERR("cannot get the script\n");
		return -1;
	}
	return ki_app_lua_runstring(msg, &s);
}

/**
 *
 */
static int w_app_lua_run(
		struct sip_msg *msg, char *func, char *p1, char *p2, char *p3)
{
	str s;
	if(!lua_sr_initialized()) {
		LM_ERR("Lua env not initialized");
		return -1;
	}
	if(fixup_get_svalue(msg, (gparam_p)func, &s) < 0) {
		LM_ERR("cannot get the function\n");
		return -1;
	}
	if(s.len >= LUA_BUF_STACK_SIZE - 1) {
		LM_ERR("function too long %d\n", s.len);
		return -1;
	}
	memcpy(_lua_buf_stack[0], s.s, s.len);
	_lua_buf_stack[0][s.len] = '\0';

	if(p1 != NULL) {
		if(fixup_get_svalue(msg, (gparam_p)p1, &s) < 0) {
			LM_ERR("cannot get p1\n");
			return -1;
		}
		if(s.len >= LUA_BUF_STACK_SIZE - 1) {
			LM_ERR("p1 too long %d\n", s.len);
			return -1;
		}
		memcpy(_lua_buf_stack[1], s.s, s.len);
		_lua_buf_stack[1][s.len] = '\0';

		if(p2 != NULL) {
			if(fixup_get_svalue(msg, (gparam_p)p2, &s) < 0) {
				LM_ERR("cannot get p2\n");
				return -1;
			}
			if(s.len >= LUA_BUF_STACK_SIZE - 1) {
				LM_ERR("p2 too long %d\n", s.len);
				return -1;
			}
			memcpy(_lua_buf_stack[2], s.s, s.len);
			_lua_buf_stack[2][s.len] = '\0';

			if(p3 != NULL) {
				if(fixup_get_svalue(msg, (gparam_p)p3, &s) < 0) {
					LM_ERR("cannot get p3\n");
					return -1;
				}
				if(s.len >= LUA_BUF_STACK_SIZE - 1) {
					LM_ERR("p3 too long %d\n", s.len);
					return -1;
				}
				memcpy(_lua_buf_stack[3], s.s, s.len);
				_lua_buf_stack[3][s.len] = '\0';
			}
		} else {
			p3 = NULL;
		}
	} else {
		p2 = NULL;
		p3 = NULL;
	}

	return app_lua_run(msg, _lua_buf_stack[0],
			(p1 != NULL) ? _lua_buf_stack[1] : NULL,
			(p2 != NULL) ? _lua_buf_stack[2] : NULL,
			(p3 != NULL) ? _lua_buf_stack[3] : NULL);
}

static int w_app_lua_run0(
		struct sip_msg *msg, char *func, char *p1, char *p2, char *p3)
{
	return w_app_lua_run(msg, func, NULL, NULL, NULL);
}

static int w_app_lua_run1(
		struct sip_msg *msg, char *func, char *p1, char *p2, char *p3)
{
	return w_app_lua_run(msg, func, p1, NULL, NULL);
}

static int w_app_lua_run2(
		struct sip_msg *msg, char *func, char *p1, char *p2, char *p3)
{
	return w_app_lua_run(msg, func, p1, p2, NULL);
}

static int w_app_lua_run3(
		struct sip_msg *msg, char *func, char *p1, char *p2, char *p3)
{
	return w_app_lua_run(msg, func, p1, p2, p3);
}

/**
 *
 */
static int ki_app_lua_run(sip_msg_t *msg, str *func)
{
	if(func == NULL || func->s == NULL || func->len < 0) {
		LM_ERR("invalid function name\n");
		return -1;
	}
	if(func->s[func->len] != '\0') {
		LM_ERR("invalid terminated function name\n");
		return -1;
	}
	return app_lua_run(msg, func->s, NULL, NULL, NULL);
}

/**
 *
 */
static int ki_app_lua_run_p1(sip_msg_t *msg, str *func, str *p1)
{
	if(func == NULL || func->s == NULL || func->len <= 0) {
		LM_ERR("invalid function name\n");
		return -1;
	}
	if(func->s[func->len] != '\0') {
		LM_ERR("invalid terminated function name\n");
		return -1;
	}
	if(p1 == NULL || p1->s == NULL || p1->len < 0) {
		LM_ERR("invalid p1 value\n");
		return -1;
	}
	if(p1->s[p1->len] != '\0') {
		LM_ERR("invalid terminated p1 value\n");
		return -1;
	}
	return app_lua_run(msg, func->s, p1->s, NULL, NULL);
}

/**
 *
 */
static int ki_app_lua_run_p2(sip_msg_t *msg, str *func, str *p1, str *p2)
{
	if(func == NULL || func->s == NULL || func->len <= 0) {
		LM_ERR("invalid function name\n");
		return -1;
	}
	if(func->s[func->len] != '\0') {
		LM_ERR("invalid terminated function name\n");
		return -1;
	}
	if(p1 == NULL || p1->s == NULL || p1->len < 0) {
		LM_ERR("invalid p1 value\n");
		return -1;
	}
	if(p1->s[p1->len] != '\0') {
		LM_ERR("invalid terminated p1 value\n");
		return -1;
	}
	if(p2 == NULL || p2->s == NULL || p2->len < 0) {
		LM_ERR("invalid p2 value\n");
		return -1;
	}
	if(p2->s[p2->len] != '\0') {
		LM_ERR("invalid terminated p2 value\n");
		return -1;
	}
	return app_lua_run(msg, func->s, p1->s, p2->s, NULL);
}

/**
 *
 */
static int ki_app_lua_run_p3(
		sip_msg_t *msg, str *func, str *p1, str *p2, str *p3)
{
	if(func == NULL || func->s == NULL || func->len <= 0) {
		LM_ERR("invalid function name\n");
		return -1;
	}
	if(func->s[func->len] != '\0') {
		LM_ERR("invalid terminated function name\n");
		return -1;
	}
	if(p1 == NULL || p1->s == NULL || p1->len < 0) {
		LM_ERR("invalid p1 value\n");
		return -1;
	}
	if(p1->s[p1->len] != '\0') {
		LM_ERR("invalid terminated p1 value\n");
		return -1;
	}
	if(p2 == NULL || p2->s == NULL || p2->len < 0) {
		LM_ERR("invalid p2 value\n");
		return -1;
	}
	if(p2->s[p2->len] != '\0') {
		LM_ERR("invalid terminated p2 value\n");
		return -1;
	}
	if(p3 == NULL || p3->s == NULL || p3->len < 0) {
		LM_ERR("invalid p3 value\n");
		return -1;
	}
	if(p3->s[p3->len] != '\0') {
		LM_ERR("invalid terminated p3 value\n");
		return -1;
	}
	return app_lua_run(msg, func->s, p1->s, p2->s, p3->s);
}

int app_lua_load_param(modparam_t type, void *val)
{
	if(val == NULL)
		return -1;
	return sr_lua_load_script((char *)val);
}

int app_lua_reload_param(modparam_t type, void *val)
{
	return sr_lua_reload_module((unsigned int)(long)(int *)val);
}

static int fixup_lua_run(void **param, int param_no)
{
	return fixup_spve_null(param, 1);
}

/**
 *
 */
/* clang-format off */
static sr_kemi_t sr_kemi_app_lua_exports[] = {
	{ str_init("app_lua"), str_init("dostring"),
		SR_KEMIP_INT, ki_app_lua_dostring,
		{ SR_KEMIP_STR, SR_KEMIP_NONE, SR_KEMIP_NONE,
			SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
	},
	{ str_init("app_lua"), str_init("dofile"),
		SR_KEMIP_INT, ki_app_lua_dofile,
		{ SR_KEMIP_STR, SR_KEMIP_NONE, SR_KEMIP_NONE,
			SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
	},
	{ str_init("app_lua"), str_init("runstring"),
		SR_KEMIP_INT, ki_app_lua_runstring,
		{ SR_KEMIP_STR, SR_KEMIP_NONE, SR_KEMIP_NONE,
			SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
	},
	{ str_init("app_lua"), str_init("run"),
		SR_KEMIP_INT, ki_app_lua_run,
		{ SR_KEMIP_STR, SR_KEMIP_NONE, SR_KEMIP_NONE,
			SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
	},
	{ str_init("app_lua"), str_init("run_p1"),
		SR_KEMIP_INT, ki_app_lua_run_p1,
		{ SR_KEMIP_STR, SR_KEMIP_STR, SR_KEMIP_NONE,
			SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
	},
	{ str_init("app_lua"), str_init("run_p2"),
		SR_KEMIP_INT, ki_app_lua_run_p2,
		{ SR_KEMIP_STR, SR_KEMIP_STR, SR_KEMIP_STR,
			SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
	},
	{ str_init("app_lua"), str_init("run_p3"),
		SR_KEMIP_INT, ki_app_lua_run_p3,
		{ SR_KEMIP_STR, SR_KEMIP_STR, SR_KEMIP_STR,
			SR_KEMIP_STR, SR_KEMIP_NONE, SR_KEMIP_NONE }
	},

	{ {0, 0}, {0, 0}, 0, NULL, { 0, 0, 0, 0, 0, 0 } }
};
/* clang-format on */

/**
 *
 */
int mod_register(char *path, int *dlflags, void *p1, void *p2)
{
	str ename = str_init("lua");

	*dlflags = RTLD_NOW | RTLD_GLOBAL;

	sr_kemi_eng_register(&ename, sr_kemi_config_engine_lua);
	sr_kemi_modules_add(sr_kemi_app_lua_exports);

	return 0;
}
