/**
 * @file prepare_statement_err3024-t.cpp
 * @brief Checks proper handling by ProxySQL of binary resultset holding errors.
 * @details This test, performs a mixed set of queries, some of them expecting errors. The test is also
 *   compiled against 'libmysqlclient' and also makes use of both ASYNC and SYNC APIs.
 */

#include <cstring>
#include <poll.h>
#include <string>
#include <stdio.h>
#include <unistd.h>
#include "mysql.h"

#include "tap.h"
#include "command_line.h"
#include "proxysql_utils.h"
#include "utils.h"

const int NUM_EXECUTIONS = 5;

std::string select_query[3] = {
	"SELECT /*+ MAX_EXECUTION_TIME(10) */ COUNT(*) FROM test.sbtest1 a JOIN test.sbtest1 b WHERE (a.id+b.id)%2" ,
	"SELECT COUNT(*) FROM (SELECT a.* FROM test.sbtest1 a JOIN test.sbtest1 b WHERE (a.id+b.id)%2 LIMIT 1000) t" ,
	"SELECT a.* FROM test.sbtest1 a JOIN test.sbtest1 b WHERE (a.id+b.id)%2 LIMIT 10000"
};

#ifndef LIBMYSQL_HELPER
/* Helper function to do the waiting for events on the socket. */
static int wait_for_mysql(MYSQL *mysql, int status) {
	struct pollfd pfd;
	int timeout, res;

	pfd.fd = mysql_get_socket(mysql);
	pfd.events =
		(status & MYSQL_WAIT_READ ? POLLIN : 0) |
		(status & MYSQL_WAIT_WRITE ? POLLOUT : 0) |
		(status & MYSQL_WAIT_EXCEPT ? POLLPRI : 0);
	if (status & MYSQL_WAIT_TIMEOUT)
		timeout = 1000*mysql_get_timeout_value(mysql);
	else
		timeout = -1;
	res = poll(&pfd, 1, timeout);
	if (res == 0)
		return MYSQL_WAIT_TIMEOUT;
	else if (res < 0)
		return MYSQL_WAIT_TIMEOUT;
	else {
		int status = 0;
		if (pfd.revents & POLLIN) status |= MYSQL_WAIT_READ;
		if (pfd.revents & POLLOUT) status |= MYSQL_WAIT_WRITE;
		if (pfd.revents & POLLPRI) status |= MYSQL_WAIT_EXCEPT;
		return status;
	}
}
#endif

using std::string;

int main(int argc, char** argv) {
	CommandLine cl;

	plan(3 + NUM_EXECUTIONS*3*2); // 3 prepare + 3 * execution * 2 (execute + store)

	if (cl.getEnv()) {
		diag("Failed to get the required environmental variables.");
		return -1;
	}

	MYSQL* mysql = mysql_init(NULL);
	if (!mysql) {
		fprintf(stderr, "File %s, line %d, Error: %s\n", __FILE__, __LINE__, mysql_error(mysql));
		return exit_status();
	}

#if defined(ASYNC_API) && !defined(LIBMYSQL_HELPER)
	mysql_options(mysql, MYSQL_OPT_NONBLOCK, 0);
#endif

	if (!mysql_real_connect(mysql, cl.host, cl.username, cl.password, NULL, cl.port, NULL, 0)) {
		fprintf(stderr, "File %s, line %d, Error: %s\n", __FILE__, __LINE__, mysql_error(mysql));
		return exit_status();
	}

	if (create_table_test_sbtest1(1000,mysql)) {
		fprintf(stderr, "File %s, line %d, Error: create_table_test_sbtest1() failed\n", __FILE__, __LINE__);
		return exit_status();
	}

	MYSQL_STMT* stmt[3];
	for (int i=0; i<3; i++) {
		// Initialize and prepare the statement
		stmt[i]= mysql_stmt_init(mysql);
		if (!stmt[i]) {
			diag("mysql_stmt_init(), out of memory\n");
			return exit_status();
		}
		if (mysql_stmt_prepare(stmt[i], select_query[i].c_str(), strlen(select_query[i].c_str()))) {
			diag("select_query: %s", select_query[i].c_str());
			ok(false, "mysql_stmt_prepare at line %d failed: %s", __LINE__ , mysql_error(mysql));
			mysql_close(mysql);
			mysql_library_end();
			return exit_status();
		} else {
			ok(true, "Prepare succeeded: %s", select_query[i].c_str());
		}
	}
	int rc = 0;

	for (int j = 0; j < NUM_EXECUTIONS; j++) {
		for (int i=0; i<3; i++) {
			// we run 3 queries:
			// the 1st should fail
			// the others should succeed
			diag("Executing: %s", select_query[i].c_str());
			rc = mysql_stmt_execute(stmt[i]);

			unsigned int sterrno = mysql_stmt_errno(stmt[i]);
			const char* strerr = mysql_stmt_error(stmt[i]);

			ok(rc == 0, "'mysql_stmt_execute' should succeed. Code: %u, error: %s", sterrno, strerr);
			if (rc == 0) {
#if defined(ASYNC_API) && !defined(LIBMYSQL_HELPER)
				diag("Using ASYNC API for 'mysql_stmt_store_result'...");
				int async_exit_status = 0;

				async_exit_status = mysql_stmt_store_result_start(&rc, stmt[i]);
				while (async_exit_status) {
					async_exit_status = wait_for_mysql(mysql, async_exit_status);
					async_exit_status = mysql_stmt_store_result_cont(&rc, stmt[i], async_exit_status);
				}
#else
				diag("Using SYNC API for 'mysql_stmt_store_result'...");
				rc = mysql_stmt_store_result(stmt[i]);
#endif

				bool check_res = false;
				string check_err {};

				sterrno = mysql_stmt_errno(stmt[i]);
				strerr = mysql_stmt_error(stmt[i]);

				if (i == 0) {
					check_res = rc == 1 && sterrno == 3024;
					string check_err_t {
						"'mysql_stmt_store_result' at line %d should fail with code 3024. Received code: %u, error: %s"
					};
					string_format(check_err_t, check_err, __LINE__, sterrno, strerr);
				} else {
					check_res = rc == 0;
					check_err = "'mysql_stmt_store_result' should succeed";
				}

				ok(check_res, "%s", check_err.c_str());
				mysql_stmt_free_result(stmt[i]);
			} else {
				diag("'mysql_stmt_execute' failed. Continuing with further tests");
			}
		}
	}
	for (int i=0; i<3; i++) {
		if (mysql_stmt_close(stmt[i])) {
			ok(false, "mysql_stmt_close at line %d failed: %s\n", __LINE__ , mysql_error(mysql));
		}
	}

	mysql_close(mysql);

	return exit_status();
}
