/*

  Simple DirectMedia Layer

  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied

  warranty.  In no event will the authors be held liable for any damages

  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,

  including commercial applications, and to alter it and redistribute it

  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not

     claim that you wrote the original software. If you use this software

     in a product, an acknowledgment in the product documentation would be

     appreciated but is not required.

  2. Altered source versions must be plainly marked as such, and must not be

     misrepresented as being the original software.

  3. This notice may not be removed or altered from any source distribution.

*/

#include "SDL_config.h"

#include "SDL_test.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <time.h>

/* Assert check message format */

const char *SDLTest_TestCheckFmt = "Test '%s': %s";

/* Invalid test name/description message format */

const char *SDLTest_InvalidNameFmt = "(Invalid)";

/*! \brief Timeout for single test case execution */

static Uint32 SDLTest_TestCaseTimeout = 3600;

/**

 * Generates a random run seed string for the harness. The generated seed

 * will contain alphanumeric characters (0-9A-Z).

 *

 * Note: The returned string needs to be deallocated by the caller.

 *

 * \param length The length of the seed string to generate

 *

 * \returns The generated seed string

 */

char *

SDLTest_GenerateRunSeed(const int length)

{

	char *seed = NULL;

	SDLTest_RandomContext randomContext;

	int counter;

	// Sanity check input

	if (length <= 0) {

		SDLTest_LogError("The length of the harness seed must be >0.");

		return NULL;

	}

	// Allocate output buffer

	seed = (char *)SDL_malloc((length + 1) * sizeof(char));

	if (seed == NULL) {

		SDLTest_LogError("SDL_malloc for run seed output buffer failed.");

		return NULL;

	}

	// Generate a random string of alphanumeric characters

	SDLTest_RandomInitTime(&randomContext);

	for (counter = 0; counter < length - 1; ++counter) {

		unsigned int number = SDLTest_Random(&randomContext);

		char ch = (char) (number % (91 - 48)) + 48;

		if (ch >= 58 && ch <= 64) {

			ch = 65;

		}

		seed[counter] = ch;

	}

	seed[counter] = '\0';

	return seed;

}

/**

 * Generates an execution key for the fuzzer.

 *

 * \param runSeed		The run seed to use

 * \param suiteName		The name of the test suite

 * \param testName		The name of the test

 * \param iteration		The iteration count

 *

 * \returns The generated execution key to initialize the fuzzer with.

 *

 */

Uint64

SDLTest_GenerateExecKey(char *runSeed, char *suiteName, char *testName, int iteration)

{

	SDLTest_Md5Context md5Context;

	Uint64 *keys;

	char iterationString[16];

	Uint32 runSeedLength;

	Uint32 suiteNameLength;

	Uint32 testNameLength;

	Uint32 iterationStringLength;

	Uint32 entireStringLength;

	char *buffer;

	if (runSeed == NULL || strlen(runSeed)==0) {

		SDLTest_LogError("Invalid runSeed string.");

		return -1;

	}

	if (suiteName == NULL || strlen(suiteName)==0) {

		SDLTest_LogError("Invalid suiteName string.");

		return -1;

	}

	if (testName == NULL || strlen(testName)==0) {

		SDLTest_LogError("Invalid testName string.");

		return -1;

	}

	if (iteration <= 0) {

		SDLTest_LogError("Invalid iteration count.");

		return -1;

	}

	// Convert iteration number into a string

	memset(iterationString, 0, sizeof(iterationString));

	SDL_snprintf(iterationString, sizeof(iterationString) - 1, "%d", iteration);

	// Combine the parameters into single string

	runSeedLength = strlen(runSeed);

	suiteNameLength = strlen(suiteName);

	testNameLength = strlen(testName);

	iterationStringLength = strlen(iterationString);

	entireStringLength  = runSeedLength + suiteNameLength + testNameLength + iterationStringLength + 1;

	buffer = (char *)SDL_malloc(entireStringLength);

	if (buffer == NULL) {

		SDLTest_LogError("SDL_malloc failed to allocate buffer for execKey generation.");

		return 0;

	}

	SDL_snprintf(buffer, entireStringLength, "%s%s%s%d", runSeed, suiteName, testName, iteration);

	// Hash string and use half of the digest as 64bit exec key

	SDLTest_Md5Init(&md5Context);

	SDLTest_Md5Update(&md5Context, (unsigned char *)buffer, entireStringLength);

	SDLTest_Md5Final(&md5Context);

	SDL_free(buffer);

	keys = (Uint64 *)md5Context.digest;

	return keys[0];

}

/**

 * \brief Set timeout handler for test.

 *

 * Note: SDL_Init(SDL_INIT_TIMER) will be called if it wasn't done so before.

 *

 * \param timeout Timeout interval in seconds.

 * \param callback Function that will be called after timeout has elapsed.

 * 

 * \return Timer id or -1 on failure.

 */

SDL_TimerID

SDLTest_SetTestTimeout(int timeout, void (*callback)())

{

	Uint32 timeoutInMilliseconds;

	SDL_TimerID timerID;

	if (callback == NULL) {

		SDLTest_LogError("Timeout callback can't be NULL");

		return -1;

	}

	if (timeout < 0) {

		SDLTest_LogError("Timeout value must be bigger than zero.");

		return -1;

	}

	/* Init SDL timer if not initialized before */

	if (SDL_WasInit(SDL_INIT_TIMER) == 0) {

		if (SDL_InitSubSystem(SDL_INIT_TIMER)) {

			SDLTest_LogError("Failed to init timer subsystem: %s", SDL_GetError());

			return -1;

		}

	}

	/* Set timer */

	timeoutInMilliseconds = timeout * 1000;

	timerID = SDL_AddTimer(timeoutInMilliseconds, (SDL_TimerCallback)callback, 0x0);

	if (timerID == 0) {

		SDLTest_LogError("Creation of SDL timer failed: %s", SDL_GetError());

		return -1;

	}

	return timerID;

}

void

SDLTest_BailOut()

{

	SDLTest_LogError("TestCaseTimeout timer expired. Aborting test run.");

	exit(TEST_ABORTED); // bail out from the test

}

/**

 * \brief Execute a test using the given execution key.

 *

 * \param testSuite Suite containing the test case.

 * \param testCase Case to execute.

 * \param execKey Execution key for the fuzzer.

 *

 * \returns Test case result.

 */

int

SDLTest_RunTest(SDLTest_TestSuiteReference *testSuite, SDLTest_TestCaseReference *testCase, Uint64 execKey)

{

	SDL_TimerID timer = 0;

	if (testSuite==NULL || testCase==NULL || testSuite->name==NULL || testCase->name==NULL)

	{

		SDLTest_LogError("Setup failure: testSuite or testCase references NULL");

		return TEST_RESULT_SETUP_FAILURE;

	}

	if (!testCase->enabled)

	{

		SDLTest_Log((char *)SDLTest_TestCheckFmt, testCase->name, "Skipped");

		return TEST_RESULT_SKIPPED;

	}

    // Initialize fuzzer

	SDLTest_FuzzerInit(execKey);

	// Reset assert tracker

	SDLTest_ResetAssertSummary();

	// Set timeout timer

	timer = SDLTest_SetTestTimeout(SDLTest_TestCaseTimeout, SDLTest_BailOut);

	// Maybe run suite initalizer function

	if (testSuite->testSetUp) {

		testSuite->testSetUp(0x0);

		if (SDLTest_AssertsFailed > 0) {

			SDLTest_LogError((char *)SDLTest_TestCheckFmt, testSuite->name, "Failed");

			return TEST_RESULT_SETUP_FAILURE;

		}

	}

	// Run test case function

	testCase->testCase(0x0);

	// Maybe run suite cleanup function

	if (testSuite->testTearDown) {

		testSuite->testTearDown(0x0);

	}

	// Cancel timeout timer

	if (timer) {

		SDL_RemoveTimer(timer);

	}

	// Report on asserts and fuzzer usage

	SDLTest_Log("Fuzzer invocations: %d", SDLTest_GetFuzzerInvocationCount());

	SDLTest_LogAssertSummary();

	// Analyze assert count to determine test case result

	if (SDLTest_AssertsFailed > 0) {

		SDLTest_LogError((char *)SDLTest_TestCheckFmt, testCase->name, "Failed");

		return TEST_RESULT_FAILED;

	} else {

		if (SDLTest_AssertsPassed > 0) {

			SDLTest_Log((char *)SDLTest_TestCheckFmt, testCase->name, "Passed");

			return TEST_RESULT_PASSED;

		} else {

			SDLTest_LogError((char *)SDLTest_TestCheckFmt, testCase->name, "No Asserts");

			return TEST_RESULT_NO_ASSERT;

		}

	}

}

/* Prints summary of all suites/tests contained in the given reference */

void SDLTest_LogTestSuiteSummary(SDLTest_TestSuiteReference *testSuites)

{

	int suiteCounter;

	int testCounter;

	SDLTest_TestSuiteReference *testSuite;

	SDLTest_TestCaseReference *testCase;

	// Loop over all suites

	suiteCounter = 0;

	while(&testSuites[suiteCounter]) {

		testSuite=&testSuites[suiteCounter];

		suiteCounter++;

		SDLTest_Log("Test Suite %i - %s\n", suiteCounter, 

			(testSuite->name) ? testSuite->name : SDLTest_InvalidNameFmt);

		// Loop over all test cases

		testCounter = 0;

		while(testSuite->testCases[testCounter])

		{

			testCase=(SDLTest_TestCaseReference *)testSuite->testCases[testCounter];

			testCounter++;

			SDLTest_Log("  Test Case %i - %s: %s", testCounter, 

				(testCase->name) ? testCase->name : SDLTest_InvalidNameFmt, 

				(testCase->description) ? testCase->description : SDLTest_InvalidNameFmt);

		}

	}

}

/**

 * \brief Execute a test using the given execution key.

 *

 * \param testSuites Suites containing the test case.

 * \param userRunSeed Custom run seed provided by user, or NULL to autogenerate one.

 * \param userExecKey Custom execution key provided by user, or 0 to autogenerate one.

 * \param testIterations Number of iterations to run each test case.

 *

 * \returns Test run result; 0 when all tests passed, 1 if any tests failed.

 */

int

SDLTest_RunSuites(SDLTest_TestSuiteReference *testSuites, char *userRunSeed, Uint64 userExecKey, int testIterations)

{

	int suiteCounter;

	int testCounter;

	int iterationCounter;

	SDLTest_TestSuiteReference *testSuite;

	SDLTest_TestCaseReference *testCase;

	char *runSeed;

	Uint64 execKey;

	Uint32 runStartTicks;

	time_t runStartTimestamp;

	Uint32 suiteStartTicks;

	time_t suiteStartTimestamp;

	Uint32 testStartTicks;

	time_t testStartTimestamp;

	Uint32 runEndTicks;

	time_t runEndTimestamp;

	Uint32 suiteEndTicks;

	time_t suiteEndTimestamp;

	Uint32 testEndTicks;

	time_t testEndTimestamp;

	int testResult;

	int totalTestFailedCount, totalTestPassedCount, totalTestSkippedCount;

	int testFailedCount, testPassedCount, testSkippedCount;

	// Sanitize test iterations

	if (testIterations < 1) {

		testIterations = 1;

	}

	// Generate run see if we don't have one already

	if (userRunSeed == NULL || strlen(userRunSeed) == 0) {

		runSeed = SDLTest_GenerateRunSeed(16);

		if (runSeed == NULL) {

			SDLTest_LogError("Generating a random run seed failed");

			return 2;

		}

	}

	// Reset per-run counters

	totalTestFailedCount = totalTestPassedCount = totalTestSkippedCount = 0;

	// Take time - run start

	runStartTicks = SDL_GetTicks();

	runStartTimestamp = time(0);

	// TODO log run started

	// Loop over all suites

	suiteCounter = 0;

	while(&testSuites[suiteCounter]) {

		testSuite=&testSuites[suiteCounter];

		suiteCounter++;

		// Reset per-suite counters

		testFailedCount = testPassedCount = testSkippedCount = 0;

		// Take time - suite start

		suiteStartTicks = SDL_GetTicks();

		suiteStartTimestamp = time(0);

		// TODO log suite started

		SDLTest_Log("Test Suite %i - %s\n", suiteCounter, 

			(testSuite->name) ? testSuite->name : SDLTest_InvalidNameFmt);

		// Loop over all test cases

		testCounter = 0;

		while(testSuite->testCases[testCounter])

		{

			testCase=(SDLTest_TestCaseReference *)testSuite->testCases[testCounter];

			testCounter++;

			// Take time - test start

			testStartTicks = SDL_GetTicks();

			testStartTimestamp = time(0);

			// TODO log test started

			SDLTest_Log("Test Case %i - %s: %s", testCounter, 

				(testCase->name) ? testCase->name : SDLTest_InvalidNameFmt, 

				(testCase->description) ? testCase->description : SDLTest_InvalidNameFmt);

			// Loop over all iterations

			iterationCounter = 0;

			while(iterationCounter < testIterations)

			{

				iterationCounter++;

				if(userExecKey != 0) {

					execKey = userExecKey;

				} else {

					execKey = SDLTest_GenerateExecKey(runSeed, testSuite->name, testCase->name, iterationCounter);

				}

				SDLTest_Log("Test Iteration %i: execKey %d", iterationCounter, execKey);

				testResult = SDLTest_RunTest(testSuite, testCase, execKey);

				if (testResult == TEST_RESULT_PASSED) {

					testPassedCount++;

					totalTestPassedCount++;

				} else if (testResult == TEST_RESULT_SKIPPED) {

					testSkippedCount++;

					totalTestSkippedCount++;

				} else {

					testFailedCount++;

					totalTestFailedCount++;

				}

			}

			// Take time - test end

			testEndTicks = SDL_GetTicks();

			testEndTimestamp = time(0);

			// TODO log test ended

		}

		// Take time - suite end

		suiteEndTicks = SDL_GetTicks();

		suiteEndTimestamp = time(0);

		// TODO log suite ended

	}

	// Take time - run end

	runEndTicks = SDL_GetTicks();

	runEndTimestamp = time(0);

	// TODO log run ended

	return (totalTestFailedCount ? 1 : 0);

}