#include <assert.h>
#include <setjmp.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>

#include "CuTest.h"

/*-------------------------------------------------------------------------*
 * CuStr
 *-------------------------------------------------------------------------*/

char *
CuStrAlloc(int size)
{
    char *newStr = (char *) malloc(sizeof(char) * (size));
    return newStr;
}

char *
CuStrCopy(const char *old)
{
    int len = strlen(old);
    char *newStr = CuStrAlloc(len + 1);
    strcpy(newStr, old);
    return newStr;
}

/*-------------------------------------------------------------------------*
 * CuString
 *-------------------------------------------------------------------------*/

void
CuStringInit(CuString * str)
{
    str->length = 0;
    str->size = STRING_MAX;
    str->buffer = (char *) malloc(sizeof(char) * str->size);
    str->buffer[0] = '\0';
}

CuString *
CuStringNew(void)
{
    CuString *str = (CuString *) malloc(sizeof(CuString));
    str->length = 0;
    str->size = STRING_MAX;
    str->buffer = (char *) malloc(sizeof(char) * str->size);
    str->buffer[0] = '\0';
    return str;
}

void
CuStringResize(CuString * str, int newSize)
{
    str->buffer = (char *) realloc(str->buffer, sizeof(char) * newSize);
    str->size = newSize;
}

void
CuStringAppend(CuString * str, const char *text)
{
    int length;

    if (text == NULL)
    {
        text = "NULL";
    }

    length = strlen(text);

    if (str->length + length + 1 >= str->size)
        CuStringResize(str, str->length + length + 1 + STRING_INC);

    str->length += length;
    strcat(str->buffer, text);
}

void
CuStringAppendChar(CuString * str, char ch)
{
    char text[2];
    text[0] = ch;
    text[1] = '\0';
    CuStringAppend(str, text);
}

void
CuStringAppendFormat(CuString * str, const char *format, ...)
{
    va_list argp;
    char buf[HUGE_STRING_LEN];
    va_start(argp, format);
    vsprintf(buf, format, argp);
    va_end(argp);
    CuStringAppend(str, buf);
}

void
CuStringInsert(CuString * str, const char *text, int pos)
{
    int length = strlen(text);

    if (pos > str->length)
        pos = str->length;

    if (str->length + length + 1 >= str->size)
        CuStringResize(str, str->length + length + 1 + STRING_INC);

    memmove(str->buffer + pos + length, str->buffer + pos,
            (str->length - pos) + 1);
    str->length += length;
    memcpy(str->buffer + pos, text, length);
}

/*-------------------------------------------------------------------------*
 * CuTest
 *-------------------------------------------------------------------------*/

void
CuTestInit(CuTest * t, const char *name, TestFunction function)
{
    t->name = CuStrCopy(name);
    t->failed = 0;
    t->ran = 0;
    t->message = NULL;
    t->function = function;
    t->jumpBuf = NULL;
}

CuTest *
CuTestNew(const char *name, TestFunction function)
{
    CuTest *tc = CU_ALLOC(CuTest);
    CuTestInit(tc, name, function);
    return tc;
}

void
CuTestRun(CuTest * tc)
{
    jmp_buf buf;
    tc->jumpBuf = &buf;

    if (setjmp(buf) == 0)
    {
        tc->ran = 1;
        (tc->function)(tc);
    }

    tc->jumpBuf = 0;
}

static void
CuFailInternal(CuTest * tc, const char *file, int line, CuString * string)
{
    char buf[HUGE_STRING_LEN];

    sprintf(buf, "%s:%d: ", file, line);
    CuStringInsert(string, buf, 0);

    tc->failed = 1;
    tc->message = string->buffer;

    if (tc->jumpBuf != 0)
        longjmp(*(tc->jumpBuf), 0);
}

void
CuFail_Line(CuTest * tc, const char *file, int line, const char *message2,
            const char *message)
{
    CuString string;

    CuStringInit(&string);

    if (message2 != NULL)
    {
        CuStringAppend(&string, message2);
        CuStringAppend(&string, ": ");
    }

    CuStringAppend(&string, message);
    CuFailInternal(tc, file, line, &string);
}

void
CuAssert_Line(CuTest * tc, const char *file, int line, const char *message,
              int condition)
{
    if (condition)
        return;

    CuFail_Line(tc, file, line, NULL, message);
}

void
CuAssertStrEquals_LineMsg(CuTest * tc, const char *file, int line,
                          const char *message, const char *expected,
                          const char *actual)
{
    CuString string;

    if ((expected == NULL && actual == NULL) ||
            (expected != NULL && actual != NULL &&
             strcmp(expected, actual) == 0))
    {
        return;
    }

    CuStringInit(&string);

    if (message != NULL)
    {
        CuStringAppend(&string, message);
        CuStringAppend(&string, ": ");
    }

    CuStringAppend(&string, "expected <");
    CuStringAppend(&string, expected);
    CuStringAppend(&string, "> but was <");
    CuStringAppend(&string, actual);
    CuStringAppend(&string, ">");
    CuFailInternal(tc, file, line, &string);
}

void
CuAssertIntEquals_LineMsg(CuTest * tc, const char *file, int line,
                          const char *message, int expected, int actual)
{
    char buf[STRING_MAX];

    if (expected == actual)
        return;

    sprintf(buf, "expected <%d> but was <%d>", expected, actual);
    CuFail_Line(tc, file, line, message, buf);
}

void
CuAssertDblEquals_LineMsg(CuTest * tc, const char *file, int line,
                          const char *message, double expected,
                          double actual, double delta)
{
    char buf[STRING_MAX];

    if (fabs(expected - actual) <= delta)
        return;

    sprintf(buf, "expected <%lf> but was <%lf>", expected, actual);
    CuFail_Line(tc, file, line, message, buf);
}

void
CuAssertPtrEquals_LineMsg(CuTest * tc, const char *file, int line,
                          const char *message, void *expected, void *actual)
{
    char buf[STRING_MAX];

    if (expected == actual)
        return;

    sprintf(buf, "expected pointer <0x%p> but was <0x%p>", expected, actual);
    CuFail_Line(tc, file, line, message, buf);
}


/*-------------------------------------------------------------------------*
 * CuSuite
 *-------------------------------------------------------------------------*/

void
CuSuiteInit(CuSuite * testSuite)
{
    testSuite->count = 0;
    testSuite->failCount = 0;
}

CuSuite *
CuSuiteNew(void)
{
    CuSuite *testSuite = CU_ALLOC(CuSuite);
    CuSuiteInit(testSuite);
    return testSuite;
}

void
CuSuiteAdd(CuSuite * testSuite, CuTest * testCase)
{
    assert(testSuite->count < MAX_TEST_CASES);
    testSuite->list[testSuite->count] = testCase;
    testSuite->count++;
}

void
CuSuiteAddSuite(CuSuite * testSuite, CuSuite * testSuite2)
{
    int i;

    for (i = 0; i < testSuite2->count; ++i)
    {
        CuTest *testCase = testSuite2->list[i];
        CuSuiteAdd(testSuite, testCase);
    }
}

void
CuSuiteRun(CuSuite * testSuite)
{
    int i;

    for (i = 0; i < testSuite->count; ++i)
    {
        CuTest *testCase = testSuite->list[i];
        CuTestRun(testCase);

        if (testCase->failed)
        {
            testSuite->failCount += 1;
        }
    }
}

void
CuSuiteSummary(CuSuite * testSuite, CuString * summary)
{
    int i;

    for (i = 0; i < testSuite->count; ++i)
    {
        CuTest *testCase = testSuite->list[i];
        CuStringAppend(summary, testCase->failed ? "F" : ".");
    }

    CuStringAppend(summary, "\n\n");
}

void
CuSuiteDetails(CuSuite * testSuite, CuString * details)
{
    int i;
    int failCount = 0;

    if (testSuite->failCount == 0)
    {
        int passCount = testSuite->count - testSuite->failCount;
        const char *testWord = passCount == 1 ? "test" : "tests";
        CuStringAppendFormat(details, "OK (%d %s)\n", passCount, testWord);
    }
    else
    {
        if (testSuite->failCount == 1)
            CuStringAppend(details, "There was 1 failure:\n");
        else
            CuStringAppendFormat(details, "There were %d failures:\n",
                                 testSuite->failCount);

        for (i = 0; i < testSuite->count; ++i)
        {
            CuTest *testCase = testSuite->list[i];

            if (testCase->failed)
            {
                failCount++;
                CuStringAppendFormat(details, "%d) %s: %s\n",
                                     failCount, testCase->name,
                                     testCase->message);
            }
        }

        CuStringAppend(details, "\n!!!FAILURES!!!\n");

        CuStringAppendFormat(details, "Runs: %d ", testSuite->count);
        CuStringAppendFormat(details, "Passes: %d ",
                             testSuite->count - testSuite->failCount);
        CuStringAppendFormat(details, "Fails: %d\n", testSuite->failCount);
    }
}
