/*
 *
 *  Embedded library
 *
 *  Copyright (C) 2021  Intel Corporation. All rights reserved.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#define _GNU_SOURCE
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>

#include <sys/time.h>

#include "idle.h"
#include "log.h"
#include "private.h"
#include "queue.h"
#include "time.h"
#include "timeout.h"
#include "useful.h"
#include "tester.h"

/**
 * SECTION:tester
 * @short_description: Non-interactive test framework
 *
 * Non-interactive test framework
 */

#define COLOR_OFF	"\x1B[0m"
#define COLOR_BLACK	"\x1B[0;30m"
#define COLOR_RED	"\x1B[0;31m"
#define COLOR_GREEN	"\x1B[0;32m"
#define COLOR_YELLOW	"\x1B[0;33m"
#define COLOR_BLUE	"\x1B[0;34m"
#define COLOR_MAGENTA	"\x1B[0;35m"
#define COLOR_HIGHLIGHT	"\x1B[1;39m"

#define print_text(color, fmt, args...) \
		l_info(color fmt COLOR_OFF, ## args)

#define print_summary(label, color, value, fmt, args...) \
		l_info("%-52s " color "%-10s" COLOR_OFF fmt, \
							label, value, ## args)

#define print_progress(name, color, fmt, args...) \
		l_info(COLOR_HIGHLIGHT "%s" COLOR_OFF " - " \
				color fmt COLOR_OFF, name, ## args)

enum test_result {
	TEST_RESULT_NOT_RUN,
	TEST_RESULT_PASSED,
	TEST_RESULT_FAILED,
	TEST_RESULT_TIMED_OUT,
};

struct l_tester {
	uint64_t start_time;
	struct l_queue *tests;
	const struct l_queue_entry *test_entry;
	bool list_cases;
	const char *prefix;
	const char *substring;
	l_tester_finish_func_t finish_callback;
};

struct test_case {
	uint64_t start_time;
	uint64_t end_time;
	char *name;
	enum test_result result;
	enum l_tester_stage stage;
	const void *test_data;
	l_tester_data_func_t pre_setup_func;
	l_tester_data_func_t setup_func;
	l_tester_data_func_t test_func;
	l_tester_data_func_t teardown_func;
	l_tester_data_func_t post_teardown_func;
	unsigned int timeout;
	struct l_timeout *run_timer;
	l_tester_destroy_func_t destroy;
	void *user_data;
	bool teardown;
};

static void destroy_test(void *data)
{
	struct test_case *test = data;

	l_timeout_remove(test->run_timer);

	if (test->destroy)
		test->destroy(test->user_data);

	l_free(test->name);
	l_free(test);
}

static uint64_t get_elapsed_time(uint64_t base)
{
	uint64_t now;

	now = l_time_now();

	return l_time_diff(base, now);
}

static void teardown_callback(void *user_data)
{
	struct l_tester *tester = user_data;
	struct test_case *test;

	test = tester->test_entry->data;
	test->stage = L_TESTER_STAGE_TEARDOWN;
	test->teardown = false;

	print_progress(test->name, COLOR_MAGENTA, "teardown");

	if (test->teardown_func)
		test->teardown_func(test->test_data);
	else
		l_tester_teardown_complete(tester);
}

static void test_timeout(struct l_timeout *timer, void *user_data)
{
	struct l_tester *tester = user_data;
	struct test_case *test;

	test = tester->test_entry->data;

	l_timeout_remove(timer);
	test->run_timer = NULL;

	test->result = TEST_RESULT_TIMED_OUT;
	print_progress(test->name, COLOR_RED, "test timed out");

	l_idle_oneshot(teardown_callback, tester, NULL);
}

static void next_test_case(struct l_tester *tester)
{
	struct test_case *test;

	if (tester->test_entry)
		tester->test_entry = tester->test_entry->next;
	else
		tester->test_entry = l_queue_get_entries(tester->tests);

	if (!tester->test_entry) {
		if (tester->finish_callback)
			tester->finish_callback(tester);
		return;
	}

	test = tester->test_entry->data;

	print_progress(test->name, COLOR_BLACK, "init");

	test->start_time = get_elapsed_time(tester->start_time);

	if (test->timeout > 0)
		test->run_timer = l_timeout_create(test->timeout, test_timeout,
								tester, NULL);

	test->stage = L_TESTER_STAGE_PRE_SETUP;

	if (test->pre_setup_func)
		test->pre_setup_func(test->test_data);
	else
		l_tester_pre_setup_complete(tester);
}

static void setup_callback(void *user_data)
{
	struct l_tester *tester = user_data;
	struct test_case *test = tester->test_entry->data;

	test->stage = L_TESTER_STAGE_SETUP;

	print_progress(test->name, COLOR_BLUE, "setup");

	if (test->setup_func)
		test->setup_func(test->test_data);
	else
		l_tester_setup_complete(tester);
}

static void run_callback(void *user_data)
{
	struct l_tester *tester = user_data;
	struct test_case *test = tester->test_entry->data;

	test->stage = L_TESTER_STAGE_RUN;

	print_progress(test->name, COLOR_BLACK, "run");
	test->test_func(test->test_data);
}

static void done_callback(void *user_data)
{
	struct l_tester *tester = user_data;
	struct test_case *test = tester->test_entry->data;

	test->end_time = get_elapsed_time(tester->start_time);

	print_progress(test->name, COLOR_BLACK, "done");
	next_test_case(tester);
}

LIB_EXPORT void *l_tester_get_data(struct l_tester *tester)
{
	struct test_case *test;

	if (unlikely(!tester))
		return NULL;

	if (!tester->test_entry)
		return NULL;

	test = tester->test_entry->data;

	return test->user_data;
}

LIB_EXPORT void l_tester_pre_setup_complete(struct l_tester *tester)
{
	struct test_case *test;

	if (unlikely(!tester))
		return;

	if (!tester->test_entry)
		return;

	test = tester->test_entry->data;

	if (test->stage != L_TESTER_STAGE_PRE_SETUP)
		return;

	l_idle_oneshot(setup_callback, tester, NULL);
}

LIB_EXPORT void l_tester_pre_setup_failed(struct l_tester *tester)
{
	struct test_case *test;

	if (unlikely(!tester))
		return;

	if (!tester->test_entry)
		return;

	test = tester->test_entry->data;

	if (test->stage != L_TESTER_STAGE_PRE_SETUP)
		return;

	print_progress(test->name, COLOR_RED, "pre setup failed");

	l_timeout_remove(test->run_timer);
	test->run_timer = NULL;

	l_idle_oneshot(done_callback, tester, NULL);
}

LIB_EXPORT void l_tester_setup_complete(struct l_tester *tester)
{
	struct test_case *test;

	if (unlikely(!tester))
		return;

	if (!tester->test_entry)
		return;

	test = tester->test_entry->data;

	if (test->stage != L_TESTER_STAGE_SETUP)
		return;

	print_progress(test->name, COLOR_BLUE, "setup complete");

	l_idle_oneshot(run_callback, tester, NULL);
}

LIB_EXPORT void l_tester_setup_failed(struct l_tester *tester)
{
	struct test_case *test;

	if (unlikely(!tester))
		return;

	if (!tester->test_entry)
		return;

	test = tester->test_entry->data;

	if (test->stage != L_TESTER_STAGE_SETUP)
		return;

	test->stage = L_TESTER_STAGE_POST_TEARDOWN;

	l_timeout_remove(test->run_timer);
	test->run_timer = NULL;

	print_progress(test->name, COLOR_RED, "setup failed");
	print_progress(test->name, COLOR_MAGENTA, "teardown");

	test->post_teardown_func(test->test_data);
}

static void test_result(struct l_tester *tester, enum test_result result)
{
	struct test_case *test;

	if (unlikely(!tester))
		return;

	if (!tester->test_entry)
		return;

	test = tester->test_entry->data;

	if (test->stage != L_TESTER_STAGE_RUN)
		return;

	l_timeout_remove(test->run_timer);
	test->run_timer = NULL;

	test->result = result;
	switch (result) {
	case TEST_RESULT_PASSED:
		print_progress(test->name, COLOR_GREEN, "test passed");
		break;
	case TEST_RESULT_FAILED:
		print_progress(test->name, COLOR_RED, "test failed");
		break;
	case TEST_RESULT_NOT_RUN:
		print_progress(test->name, COLOR_YELLOW, "test not run");
		break;
	case TEST_RESULT_TIMED_OUT:
		print_progress(test->name, COLOR_RED, "test timed out");
		break;
	}

	if (test->teardown)
		return;

	test->teardown = true;

	l_idle_oneshot(teardown_callback, tester, NULL);
}

LIB_EXPORT void l_tester_test_passed(struct l_tester *tester)
{
	if (unlikely(!tester))
		return;

	test_result(tester, TEST_RESULT_PASSED);
}

LIB_EXPORT void l_tester_test_failed(struct l_tester *tester)
{
	if (unlikely(!tester))
		return;

	test_result(tester, TEST_RESULT_FAILED);
}

LIB_EXPORT void l_tester_test_abort(struct l_tester *tester)
{
	if (unlikely(!tester))
		return;

	test_result(tester, TEST_RESULT_NOT_RUN);
}

LIB_EXPORT void l_tester_teardown_complete(struct l_tester *tester)
{
	struct test_case *test;

	if (unlikely(!tester))
		return;

	if (!tester->test_entry)
		return;

	test = tester->test_entry->data;

	if (test->stage != L_TESTER_STAGE_TEARDOWN)
		return;

	test->stage = L_TESTER_STAGE_POST_TEARDOWN;

	if (test->post_teardown_func)
		test->post_teardown_func(test->test_data);
	else
		l_tester_post_teardown_complete(tester);
}

LIB_EXPORT void l_tester_teardown_failed(struct l_tester *tester)
{
	struct test_case *test;

	if (unlikely(!tester))
		return;

	if (!tester->test_entry)
		return;

	test = tester->test_entry->data;

	if (test->stage != L_TESTER_STAGE_TEARDOWN)
		return;

	test->stage = L_TESTER_STAGE_POST_TEARDOWN;

	l_tester_post_teardown_failed(tester);
}

LIB_EXPORT void l_tester_post_teardown_complete(struct l_tester *tester)
{
	struct test_case *test;

	if (unlikely(!tester))
		return;

	if (!tester->test_entry)
		return;

	test = tester->test_entry->data;

	if (test->stage != L_TESTER_STAGE_POST_TEARDOWN)
		return;

	print_progress(test->name, COLOR_MAGENTA, "teardown complete");

	l_idle_oneshot(done_callback, tester, NULL);
}

LIB_EXPORT void l_tester_post_teardown_failed(struct l_tester *tester)
{
	struct test_case *test;

	if (unlikely(!tester))
		return;

	if (!tester->test_entry)
		return;

	test = tester->test_entry->data;

	if (test->stage != L_TESTER_STAGE_POST_TEARDOWN)
		return;

	print_progress(test->name, COLOR_RED, "teardown failed");

	l_idle_oneshot(done_callback, tester, NULL);
}

struct wait_data {
	unsigned int seconds;
	struct test_case *test;
	l_tester_wait_func_t func;
	void *user_data;
};

static void wait_callback(struct l_timeout *timer, void *user_data)
{
	struct wait_data *wait = user_data;
	struct test_case *test = wait->test;

	wait->seconds--;

	if (wait->seconds > 0) {
		print_progress(test->name, COLOR_BLACK, "%u seconds left",
								wait->seconds);
		return;
	}

	print_progress(test->name, COLOR_BLACK, "waiting done");

	wait->func(wait->user_data);

	l_free(wait);

	l_timeout_remove(timer);
}

LIB_EXPORT void l_tester_wait(struct l_tester *tester, unsigned int seconds,
				l_tester_wait_func_t func, void *user_data)
{
	struct test_case *test;
	struct wait_data *wait;

	if (unlikely(!tester))
		return;

	if (!func || seconds < 1)
		return;

	if (!tester->test_entry)
		return;

	test = tester->test_entry->data;

	wait = l_new(struct wait_data, 1);
	wait->seconds = seconds;
	wait->test = test;
	wait->func = func;
	wait->user_data = user_data;

	l_timeout_create(seconds, wait_callback, wait, NULL);

	print_progress(test->name, COLOR_BLACK, "waiting %u seconds", seconds);
}

/**
 * l_tester_add_full:
 * @tester: tester instance
 * @name: test case name
 * @test_data: test data
 * @pre_setup_func: test pre-setup function
 * @setup_func: test setup function
 * @test_func: test function
 * @teardown_func: test teardown function
 * @teardown_func: test post-teardown function
 * @timeout: test teardown function
 * @user_data: user data
 * @destroy: user data destroy function
 *
 * Add a new test case.
 **/
LIB_EXPORT void l_tester_add_full(struct l_tester *tester, const char *name,
							const void *test_data,
					l_tester_data_func_t pre_setup_func,
					l_tester_data_func_t setup_func,
					l_tester_data_func_t test_func,
					l_tester_data_func_t teardown_func,
					l_tester_data_func_t post_teardown_func,
					unsigned int timeout,
					void *user_data,
					l_tester_destroy_func_t destroy)
{
	struct test_case *test;

	if (unlikely(!tester || !test_func))
		return;

	if (tester->prefix && !l_str_has_prefix(name, tester->prefix)) {
		if (destroy)
			destroy(user_data);
		return;
	}

	if (tester->substring && !strstr(name, tester->substring)) {
		if (destroy)
			destroy(user_data);
		return;
	}

	if (tester->list_cases) {
		l_info("%s", name);

		if (destroy)
			destroy(user_data);
		return;
	}

	test = l_new(struct test_case, 1);
	test->name = l_strdup(name);
	test->result = TEST_RESULT_NOT_RUN;
	test->stage = L_TESTER_STAGE_INVALID;

	test->test_data = test_data;
	test->pre_setup_func = pre_setup_func;
	test->setup_func = setup_func;
	test->test_func = test_func;
	test->teardown_func = teardown_func;
	test->post_teardown_func = post_teardown_func;
	test->timeout = timeout;
	test->destroy = destroy;
	test->user_data = user_data;

	l_queue_push_tail(tester->tests, test);
}

/**
 * l_tester_add:
 * @tester: tester instance
 * @name: test case name
 * @test_data: test data
 * @setup_func: test setup function
 * @test_func: test function
 * @teardown_func: test teardown function
 *
 * Add a new test with default settings for timeout and no pre-setup procedure.
 **/
LIB_EXPORT void l_tester_add(struct l_tester *tester, const char *name,
					const void *test_data,
					l_tester_data_func_t setup_func,
					l_tester_data_func_t test_func,
					l_tester_data_func_t teardown_func)
{
	l_tester_add_full(tester, name, test_data, NULL, setup_func, test_func,
					teardown_func, NULL, 0, NULL, NULL);
}

/**
 * l_tester_new:
 *
 * Initialize tester framework.
 *
 * Returns: new tester instance
 **/
LIB_EXPORT struct l_tester *l_tester_new(const char *prefix,
					const char *substring, bool list_cases)
{
	struct l_tester *tester = l_new(struct l_tester, 1);

	tester->prefix = prefix;
	tester->substring = substring;
	tester->list_cases = list_cases;
	tester->tests = l_queue_new();
	return tester;
}

/**
 * l_tester_start:
 * @tester: tester instance
 *
 * Kick off execution of the test queue
 *
 **/
LIB_EXPORT void l_tester_start(struct l_tester *tester,
					l_tester_finish_func_t finish_func)
{
	if (unlikely(!tester))
		return;

	if (!tester->tests)
		return;

	tester->finish_callback = finish_func;

	tester->start_time = l_time_now();
	next_test_case(tester);
}

/**
 * l_tester_summarize:
 * @tester: tester instance
 *
 * Print summary of all added test cases.
 *
 * Returns: true, if all the tests passed
 *          false, if any of the tests failed
 **/
LIB_EXPORT bool l_tester_summarize(struct l_tester *tester)
{
	unsigned int not_run = 0, passed = 0, failed = 0;
	double execution_time;
	const struct l_queue_entry *entry;

	if (unlikely(!tester))
		return false;

	l_info(COLOR_HIGHLIGHT "%s" COLOR_OFF,
					"\n\nTest Summary\n------------");

	entry = l_queue_get_entries(tester->tests);

	for (; entry; entry = entry->next) {
		struct test_case *test = entry->data;
		double exec_time;

		exec_time = (test->end_time - test->start_time) /
							(double)L_USEC_PER_SEC;

		switch (test->result) {
		case TEST_RESULT_NOT_RUN:
			print_summary(test->name, COLOR_YELLOW, "Not Run", "");
			not_run++;
			break;
		case TEST_RESULT_PASSED:
			print_summary(test->name, COLOR_GREEN, "Passed",
					"%8.3f seconds", exec_time);
			passed++;
			break;
		case TEST_RESULT_FAILED:
			print_summary(test->name, COLOR_RED, "Failed",
						"%8.3f seconds", exec_time);
			failed++;
			break;
		case TEST_RESULT_TIMED_OUT:
			print_summary(test->name, COLOR_RED, "Timed out",
						"%8.3f seconds", exec_time);
			failed++;
			break;
		}
	}

	l_info("Total: %d, "
		COLOR_GREEN "Passed: %d (%.1f%%)" COLOR_OFF ", "
		COLOR_RED "Failed: %d" COLOR_OFF ", "
		COLOR_YELLOW "Not Run: %d" COLOR_OFF,
			not_run + passed + failed, passed,
			(not_run + passed + failed) ?
			(float) passed * 100 / (not_run + passed + failed) : 0,
			failed, not_run);

	execution_time = get_elapsed_time(tester->start_time);

	l_info("Overall execution time: %8.3f seconds",
				execution_time / (double)L_USEC_PER_SEC);

	return failed;
}

/**
 * l_tester_destroy:
 * @tester: tester instance
 *
 * Free up the teter framework resources
 *
 **/
LIB_EXPORT void l_tester_destroy(struct l_tester *tester)
{
	if (unlikely(!tester))
		return;

	l_queue_destroy(tester->tests, destroy_test);
	l_free(tester);
}

/**
 * l_tester_get_stage:
 * @tester: tester instance
 *
 * Get the current test stage
 *
 * Returns: the stage of the current test that is being processing.
 *
 **/
LIB_EXPORT enum l_tester_stage l_tester_get_stage(struct l_tester *tester)
{
	struct test_case *test;

	if (unlikely(!tester))
		return L_TESTER_STAGE_INVALID;

	if (!tester->test_entry)
		return L_TESTER_STAGE_INVALID;

	test = tester->test_entry->data;

	return test->stage;
}