/**
 * Original code: automated SDL platform test written by Edgar Simo "bobbens"
 * Extended and updated by aschiffler at ferzkopp dot net
 */

#include <stdio.h>

#include "SDL.h"
#include "SDL_test.h"

/* ================= Test Case Implementation ================== */

/* Helper functions */

/**
 * @brief Compare sizes of types.
 *
 * @note Watcom C flags these as Warning 201: "Unreachable code" if you just
 *  compare them directly, so we push it through a function to keep the
 *  compiler quiet.  --ryan.
 */
static int _compareSizeOfType( size_t sizeoftype, size_t hardcodetype )
{
    return sizeoftype != hardcodetype;
}

/* Test case functions */

/**
 * @brief Tests type sizes.
 */
int platform_testTypes(void *arg)
{
   int ret;

   ret = _compareSizeOfType( sizeof(Uint8), 1 );
   SDLTest_AssertCheck( ret == 0, "sizeof(Uint8) = %lu, expected  1", (unsigned long)sizeof(Uint8) );

   ret = _compareSizeOfType( sizeof(Uint16), 2 );
   SDLTest_AssertCheck( ret == 0, "sizeof(Uint16) = %lu, expected 2", (unsigned long)sizeof(Uint16) );

   ret = _compareSizeOfType( sizeof(Uint32), 4 );
   SDLTest_AssertCheck( ret == 0, "sizeof(Uint32) = %lu, expected 4", (unsigned long)sizeof(Uint32) );

   ret = _compareSizeOfType( sizeof(Uint64), 8 );
   SDLTest_AssertCheck( ret == 0, "sizeof(Uint64) = %lu, expected 8", (unsigned long)sizeof(Uint64) );

   return TEST_COMPLETED;
}

/**
 * @brief Tests platform endianness and SDL_SwapXY functions.
 */
int platform_testEndianessAndSwap(void *arg)
{
    int real_byteorder;
    Uint16 value = 0x1234;
    Uint16 value16 = 0xCDAB;
    Uint16 swapped16 = 0xABCD;
    Uint32 value32 = 0xEFBEADDE;
    Uint32 swapped32 = 0xDEADBEEF;

    Uint64 value64, swapped64;
    value64 = 0xEFBEADDE;
    value64 <<= 32;
    value64 |= 0xCDAB3412;
    swapped64 = 0x1234ABCD;
    swapped64 <<= 32;
    swapped64 |= 0xDEADBEEF;

    if ((*((char *) &value) >> 4) == 0x1) {
        real_byteorder = SDL_BIG_ENDIAN;
    } else {
        real_byteorder = SDL_LIL_ENDIAN;
    }

    /* Test endianness. */
    SDLTest_AssertCheck( real_byteorder == SDL_BYTEORDER,
             "Machine detected as %s endian, appears to be %s endian.",
             (SDL_BYTEORDER == SDL_LIL_ENDIAN) ? "little" : "big",
             (real_byteorder == SDL_LIL_ENDIAN) ? "little" : "big" );

    /* Test 16 swap. */
    SDLTest_AssertCheck( SDL_Swap16(value16) == swapped16,
             "SDL_Swap16(): 16 bit swapped: 0x%X => 0x%X",
             value16, SDL_Swap16(value16) );

    /* Test 32 swap. */
    SDLTest_AssertCheck( SDL_Swap32(value32) == swapped32,
             "SDL_Swap32(): 32 bit swapped: 0x%X => 0x%X",
             value32, SDL_Swap32(value32) );

    /* Test 64 swap. */
    SDLTest_AssertCheck( SDL_Swap64(value64) == swapped64,
             "SDL_Swap64(): 64 bit swapped: 0x%"SDL_PRIX64" => 0x%"SDL_PRIX64,
             value64, SDL_Swap64(value64) );

   return TEST_COMPLETED;
}

/* !
 * \brief Tests SDL_GetXYZ() functions
 * \sa
 * https://github.com/libsdl-org/SDL/wiki/SDL_GetPlatform
 * https://github.com/libsdl-org/SDL/wiki/SDL_GetCPUCount
 * https://github.com/libsdl-org/SDL/wiki/SDL_GetCPUCacheLineSize
 * https://github.com/libsdl-org/SDL/wiki/SDL_GetRevision
 * https://github.com/libsdl-org/SDL/wiki/SDL_GetRevisionNumber
 */
int platform_testGetFunctions (void *arg)
{
   char *platform;
   char *revision;
   int ret;
   size_t len;

   platform = (char *)SDL_GetPlatform();
   SDLTest_AssertPass("SDL_GetPlatform()");
   SDLTest_AssertCheck(platform != NULL, "SDL_GetPlatform() != NULL");
   if (platform != NULL) {
     len = SDL_strlen(platform);
     SDLTest_AssertCheck(len > 0,
             "SDL_GetPlatform(): expected non-empty platform, was platform: '%s', len: %i",
             platform,
             (int) len);
   }

   ret = SDL_GetCPUCount();
   SDLTest_AssertPass("SDL_GetCPUCount()");
   SDLTest_AssertCheck(ret > 0,
             "SDL_GetCPUCount(): expected count > 0, was: %i",
             ret);

   ret = SDL_GetCPUCacheLineSize();
   SDLTest_AssertPass("SDL_GetCPUCacheLineSize()");
   SDLTest_AssertCheck(ret >= 0,
             "SDL_GetCPUCacheLineSize(): expected size >= 0, was: %i",
             ret);

   revision = (char *)SDL_GetRevision();
   SDLTest_AssertPass("SDL_GetRevision()");
   SDLTest_AssertCheck(revision != NULL, "SDL_GetRevision() != NULL");

   return TEST_COMPLETED;
}

/* !
 * \brief Tests SDL_HasXYZ() functions
 * \sa
 * https://github.com/libsdl-org/SDL/wiki/SDL_Has3DNow
 * https://github.com/libsdl-org/SDL/wiki/SDL_HasAltiVec
 * https://github.com/libsdl-org/SDL/wiki/SDL_HasMMX
 * https://github.com/libsdl-org/SDL/wiki/SDL_HasRDTSC
 * https://github.com/libsdl-org/SDL/wiki/SDL_HasSSE
 * https://github.com/libsdl-org/SDL/wiki/SDL_HasSSE2
 * https://github.com/libsdl-org/SDL/wiki/SDL_HasSSE3
 * https://github.com/libsdl-org/SDL/wiki/SDL_HasSSE41
 * https://github.com/libsdl-org/SDL/wiki/SDL_HasSSE42
 * https://github.com/libsdl-org/SDL/wiki/SDL_HasAVX
 */
int platform_testHasFunctions (void *arg)
{
   int ret;

   /* TODO: independently determine and compare values as well */

   ret = SDL_HasRDTSC();
   SDLTest_AssertPass("SDL_HasRDTSC()");

   ret = SDL_HasAltiVec();
   SDLTest_AssertPass("SDL_HasAltiVec()");

   ret = SDL_HasMMX();
   SDLTest_AssertPass("SDL_HasMMX()");

   ret = SDL_Has3DNow();
   SDLTest_AssertPass("SDL_Has3DNow()");

   ret = SDL_HasSSE();
   SDLTest_AssertPass("SDL_HasSSE()");

   ret = SDL_HasSSE2();
   SDLTest_AssertPass("SDL_HasSSE2()");

   ret = SDL_HasSSE3();
   SDLTest_AssertPass("SDL_HasSSE3()");

   ret = SDL_HasSSE41();
   SDLTest_AssertPass("SDL_HasSSE41()");

   ret = SDL_HasSSE42();
   SDLTest_AssertPass("SDL_HasSSE42()");

   ret = SDL_HasAVX();
   SDLTest_AssertPass("SDL_HasAVX()");

   return TEST_COMPLETED;
}

/* !
 * \brief Tests SDL_GetVersion
 * \sa
 * https://github.com/libsdl-org/SDL/wiki/SDL_GetVersion
 */
int platform_testGetVersion(void *arg)
{
   SDL_version linked;
   int major = SDL_MAJOR_VERSION;
   int minor = SDL_MINOR_VERSION;

   SDL_GetVersion(&linked);
   SDLTest_AssertCheck( linked.major >= major,
             "SDL_GetVersion(): returned major %i (>= %i)",
             linked.major,
             major);
   SDLTest_AssertCheck( linked.minor >= minor,
             "SDL_GetVersion(): returned minor %i (>= %i)",
             linked.minor,
             minor);

   return TEST_COMPLETED;
}


/* !
 * \brief Tests SDL_VERSION macro
 */
int platform_testSDLVersion(void *arg)
{
   SDL_version compiled;
   int major = SDL_MAJOR_VERSION;
   int minor = SDL_MINOR_VERSION;

   SDL_VERSION(&compiled);
   SDLTest_AssertCheck( compiled.major >= major,
             "SDL_VERSION() returned major %i (>= %i)",
             compiled.major,
             major);
   SDLTest_AssertCheck( compiled.minor >= minor,
             "SDL_VERSION() returned minor %i (>= %i)",
             compiled.minor,
             minor);

   return TEST_COMPLETED;
}


/* !
 * \brief Tests default SDL_Init
 */
int platform_testDefaultInit(void *arg)
{
   int ret;
   int subsystem;

   subsystem = SDL_WasInit(SDL_INIT_EVERYTHING);
   SDLTest_AssertCheck( subsystem != 0,
             "SDL_WasInit(0): returned %i, expected != 0",
             subsystem);

   ret = SDL_Init(SDL_WasInit(SDL_INIT_EVERYTHING));
   SDLTest_AssertCheck( ret == 0,
             "SDL_Init(0): returned %i, expected 0, error: %s",
             ret,
             SDL_GetError());

   return TEST_COMPLETED;
}

/* !
 * \brief Tests SDL_Get/Set/ClearError
 * \sa
 * https://github.com/libsdl-org/SDL/wiki/SDL_GetError
 * https://github.com/libsdl-org/SDL/wiki/SDL_SetError
 * https://github.com/libsdl-org/SDL/wiki/SDL_ClearError
 */
int platform_testGetSetClearError(void *arg)
{
   int result;
   const char *testError = "Testing";
   char *lastError;
   size_t len;

   SDL_ClearError();
   SDLTest_AssertPass("SDL_ClearError()");

   lastError = (char *)SDL_GetError();
   SDLTest_AssertPass("SDL_GetError()");
   SDLTest_AssertCheck(lastError != NULL,
             "SDL_GetError() != NULL");
   if (lastError != NULL)
   {
     len = SDL_strlen(lastError);
     SDLTest_AssertCheck(len == 0,
             "SDL_GetError(): no message expected, len: %i", (int) len);
   }

   result = SDL_SetError("%s", testError);
   SDLTest_AssertPass("SDL_SetError()");
   SDLTest_AssertCheck(result == -1, "SDL_SetError: expected -1, got: %i", result);
   lastError = (char *)SDL_GetError();
   SDLTest_AssertCheck(lastError != NULL,
             "SDL_GetError() != NULL");
   if (lastError != NULL)
   {
     len = SDL_strlen(lastError);
     SDLTest_AssertCheck(len == SDL_strlen(testError),
             "SDL_GetError(): expected message len %i, was len: %i",
             (int) SDL_strlen(testError),
             (int) len);
     SDLTest_AssertCheck(SDL_strcmp(lastError, testError) == 0,
             "SDL_GetError(): expected message %s, was message: %s",
             testError,
             lastError);
   }

   /* Clean up */
   SDL_ClearError();
   SDLTest_AssertPass("SDL_ClearError()");

   return TEST_COMPLETED;
}

/* !
 * \brief Tests SDL_SetError with empty input
 * \sa
 * https://github.com/libsdl-org/SDL/wiki/SDL_SetError
 */
int platform_testSetErrorEmptyInput(void *arg)
{
   int result;
   const char *testError = "";
   char *lastError;
   size_t len;

   result = SDL_SetError("%s", testError);
   SDLTest_AssertPass("SDL_SetError()");
   SDLTest_AssertCheck(result == -1, "SDL_SetError: expected -1, got: %i", result);
   lastError = (char *)SDL_GetError();
   SDLTest_AssertCheck(lastError != NULL,
             "SDL_GetError() != NULL");
   if (lastError != NULL)
   {
     len = SDL_strlen(lastError);
     SDLTest_AssertCheck(len == SDL_strlen(testError),
             "SDL_GetError(): expected message len %i, was len: %i",
             (int) SDL_strlen(testError),
             (int) len);
     SDLTest_AssertCheck(SDL_strcmp(lastError, testError) == 0,
             "SDL_GetError(): expected message '%s', was message: '%s'",
             testError,
             lastError);
   }

   /* Clean up */
   SDL_ClearError();
   SDLTest_AssertPass("SDL_ClearError()");

   return TEST_COMPLETED;
}

/* !
 * \brief Tests SDL_SetError with invalid input
 * \sa
 * https://github.com/libsdl-org/SDL/wiki/SDL_SetError
 */
int platform_testSetErrorInvalidInput(void *arg)
{
   int result;
   const char *invalidError = NULL;
   const char *probeError = "Testing";
   char *lastError;
   size_t len;

   /* Reset */
   SDL_ClearError();
   SDLTest_AssertPass("SDL_ClearError()");

   /* Check for no-op */
   result = SDL_SetError("%s", invalidError);
   SDLTest_AssertPass("SDL_SetError()");
   SDLTest_AssertCheck(result == -1, "SDL_SetError: expected -1, got: %i", result);
   lastError = (char *)SDL_GetError();
   SDLTest_AssertCheck(lastError != NULL,
             "SDL_GetError() != NULL");
   if (lastError != NULL)
   {
     len = SDL_strlen(lastError);
     SDLTest_AssertCheck(len == 0,
             "SDL_GetError(): expected message len 0, was len: %i",
             (int) len);
   }

   /* Set */
   result = SDL_SetError("%s", probeError);
   SDLTest_AssertPass("SDL_SetError('%s')", probeError);
   SDLTest_AssertCheck(result == -1, "SDL_SetError: expected -1, got: %i", result);

   /* Check for no-op */
   result = SDL_SetError("%s", invalidError);
   SDLTest_AssertPass("SDL_SetError(NULL)");
   SDLTest_AssertCheck(result == -1, "SDL_SetError: expected -1, got: %i", result);
   lastError = (char *)SDL_GetError();
   SDLTest_AssertCheck(lastError != NULL,
             "SDL_GetError() != NULL");
   if (lastError != NULL)
   {
     len = SDL_strlen(lastError);
     SDLTest_AssertCheck(len == 0,
             "SDL_GetError(): expected message len 0, was len: %i",
             (int) len);
   }

   /* Reset */
   SDL_ClearError();
   SDLTest_AssertPass("SDL_ClearError()");

   /* Set and check */
   result = SDL_SetError("%s", probeError);
   SDLTest_AssertPass("SDL_SetError()");
   SDLTest_AssertCheck(result == -1, "SDL_SetError: expected -1, got: %i", result);
   lastError = (char *)SDL_GetError();
   SDLTest_AssertCheck(lastError != NULL,
             "SDL_GetError() != NULL");
   if (lastError != NULL)
   {
     len = SDL_strlen(lastError);
     SDLTest_AssertCheck(len == SDL_strlen(probeError),
             "SDL_GetError(): expected message len %i, was len: %i",
             (int) SDL_strlen(probeError),
             (int) len);
     SDLTest_AssertCheck(SDL_strcmp(lastError, probeError) == 0,
             "SDL_GetError(): expected message '%s', was message: '%s'",
             probeError,
             lastError);
   }
   
   /* Clean up */
   SDL_ClearError();
   SDLTest_AssertPass("SDL_ClearError()");

   return TEST_COMPLETED;
}

/* !
 * \brief Tests SDL_GetPowerInfo
 * \sa
 * https://github.com/libsdl-org/SDL/wiki/SDL_GetPowerInfo
 */
int platform_testGetPowerInfo(void *arg)
{
   SDL_PowerState state;
   SDL_PowerState stateAgain;
   int secs;
   int secsAgain;
   int pct;
   int pctAgain;

   state = SDL_GetPowerInfo(&secs, &pct);
   SDLTest_AssertPass("SDL_GetPowerInfo()");
   SDLTest_AssertCheck(
       state==SDL_POWERSTATE_UNKNOWN ||
       state==SDL_POWERSTATE_ON_BATTERY ||
       state==SDL_POWERSTATE_NO_BATTERY ||
       state==SDL_POWERSTATE_CHARGING ||
       state==SDL_POWERSTATE_CHARGED,
       "SDL_GetPowerInfo(): state %i is one of the expected values",
       (int)state);

   if (state==SDL_POWERSTATE_ON_BATTERY)
   {
      SDLTest_AssertCheck(
         secs >= 0,
         "SDL_GetPowerInfo(): on battery, secs >= 0, was: %i",
         secs);
      SDLTest_AssertCheck(
         (pct >= 0) && (pct <= 100),
         "SDL_GetPowerInfo(): on battery, pct=[0,100], was: %i",
         pct);
   }

   if (state==SDL_POWERSTATE_UNKNOWN ||
       state==SDL_POWERSTATE_NO_BATTERY)
   {
      SDLTest_AssertCheck(
         secs == -1,
         "SDL_GetPowerInfo(): no battery, secs == -1, was: %i",
         secs);
      SDLTest_AssertCheck(
         pct == -1,
         "SDL_GetPowerInfo(): no battery, pct == -1, was: %i",
         pct);
   }

   /* Partial return value variations */
   stateAgain = SDL_GetPowerInfo(&secsAgain, NULL);
   SDLTest_AssertCheck(
        state==stateAgain,
        "State %i returned when only 'secs' requested",
        stateAgain);
   SDLTest_AssertCheck(
        secs==secsAgain,
        "Value %i matches when only 'secs' requested",
        secsAgain);
   stateAgain = SDL_GetPowerInfo(NULL, &pctAgain);
   SDLTest_AssertCheck(
        state==stateAgain,
        "State %i returned when only 'pct' requested",
        stateAgain);
   SDLTest_AssertCheck(
        pct==pctAgain,
        "Value %i matches when only 'pct' requested",
        pctAgain);
   stateAgain = SDL_GetPowerInfo(NULL, NULL);
   SDLTest_AssertCheck(
        state==stateAgain,
        "State %i returned when no value requested",
        stateAgain);

   return TEST_COMPLETED;
}

/* ================= Test References ================== */

/* Platform test cases */
static const SDLTest_TestCaseReference platformTest1 =
        { (SDLTest_TestCaseFp)platform_testTypes, "platform_testTypes", "Tests predefined types", TEST_ENABLED};

static const SDLTest_TestCaseReference platformTest2 =
        { (SDLTest_TestCaseFp)platform_testEndianessAndSwap, "platform_testEndianessAndSwap", "Tests endianess and swap functions", TEST_ENABLED};

static const SDLTest_TestCaseReference platformTest3 =
        { (SDLTest_TestCaseFp)platform_testGetFunctions, "platform_testGetFunctions", "Tests various SDL_GetXYZ functions", TEST_ENABLED};

static const SDLTest_TestCaseReference platformTest4 =
        { (SDLTest_TestCaseFp)platform_testHasFunctions, "platform_testHasFunctions", "Tests various SDL_HasXYZ functions", TEST_ENABLED};

static const SDLTest_TestCaseReference platformTest5 =
        { (SDLTest_TestCaseFp)platform_testGetVersion, "platform_testGetVersion", "Tests SDL_GetVersion function", TEST_ENABLED};

static const SDLTest_TestCaseReference platformTest6 =
        { (SDLTest_TestCaseFp)platform_testSDLVersion, "platform_testSDLVersion", "Tests SDL_VERSION macro", TEST_ENABLED};

static const SDLTest_TestCaseReference platformTest7 =
        { (SDLTest_TestCaseFp)platform_testDefaultInit, "platform_testDefaultInit", "Tests default SDL_Init", TEST_ENABLED};

static const SDLTest_TestCaseReference platformTest8 =
        { (SDLTest_TestCaseFp)platform_testGetSetClearError, "platform_testGetSetClearError", "Tests SDL_Get/Set/ClearError", TEST_ENABLED};

static const SDLTest_TestCaseReference platformTest9 =
        { (SDLTest_TestCaseFp)platform_testSetErrorEmptyInput, "platform_testSetErrorEmptyInput", "Tests SDL_SetError with empty input", TEST_ENABLED};

static const SDLTest_TestCaseReference platformTest10 =
        { (SDLTest_TestCaseFp)platform_testSetErrorInvalidInput, "platform_testSetErrorInvalidInput", "Tests SDL_SetError with invalid input", TEST_ENABLED};

static const SDLTest_TestCaseReference platformTest11 =
        { (SDLTest_TestCaseFp)platform_testGetPowerInfo, "platform_testGetPowerInfo", "Tests SDL_GetPowerInfo function", TEST_ENABLED };

/* Sequence of Platform test cases */
static const SDLTest_TestCaseReference *platformTests[] =  {
    &platformTest1,
    &platformTest2,
    &platformTest3,
    &platformTest4,
    &platformTest5,
    &platformTest6,
    &platformTest7,
    &platformTest8,
    &platformTest9,
    &platformTest10,
    &platformTest11,
    NULL
};

/* Platform test suite (global) */
SDLTest_TestSuiteReference platformTestSuite = {
    "Platform",
    NULL,
    platformTests,
    NULL
};