/*
*****************************************************************************************
*
*   Copyright (C) 1996-2000, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*****************************************************************************************
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <stdarg.h>

/* NOTES:
   3/20/1999 srl - strncpy called w/o setting nulls at the end
 */

#define MAXTESTNAME 128
#define MAXTESTS  512
#define MAX_TEST_LOG 4096

struct TestNode
{
  char name[MAXTESTNAME];
  void (*test)(void);
  struct TestNode* sibling;
  struct TestNode* child;
};


static const struct TestNode* currentTest;

typedef enum { RUNTESTS, SHOWTESTS } TestMode;
#define TEST_SEPARATOR '/'

#ifndef C_TEST_IMPL
#define C_TEST_IMPL
#endif

#include "unicode/ctest.h"

static char ERROR_LOG[MAX_TEST_LOG][MAXTESTNAME];

static TestNode* addTestNode( TestNode *root, const char *name );

static TestNode* createTestNode();

static int strncmp_nullcheck( const char* s1,
                  const char* s2,
                  int n );

static void getNextLevel( const char* name,
              int* nameLen,
              const char** nextName );

static void iterateTestsWithLevel( const TestNode *root, int len,
                   const TestNode** list,
                   TestMode mode);
/* If we need to make the framework multi-thread safe
   we need to pass around the following 3 vars
*/

static void help ( const char *argv0 );

static int ERRONEOUS_FUNCTION_COUNT = 0;
static int ERROR_COUNT = 0; /* Count of errors from all tests. */
static int INDENT_LEVEL = 0;
int REPEAT_TESTS_INIT = 0; /* Was REPEAT_TESTS initialized? */
int REPEAT_TESTS = 1; /* Number of times to run the test */
int VERBOSITY = 0; /* be No-verbose by default */
int ERR_MSG =1; /* error messages will be displayed by default*/
int QUICK = 1;  /* Skip some of the slower tests? */
/*-------------------------------------------*/

/* strncmp that also makes sure there's a \0 at s2[0] */
static int strncmp_nullcheck( const char* s1,
               const char* s2,
               int n )
{
    if (((int)strlen(s2) >= n) && s2[n] != 0) {
        return 3; /* null check fails */
    }
    else {
        return strncmp ( s1, s2, n );
    }
}

static void getNextLevel( const char* name,
           int* nameLen,
           const char** nextName )
{
    /* Get the next component of the name */
    *nextName = strchr(name, TEST_SEPARATOR);

    if( *nextName != 0 )
    {
        char n[255];
        *nameLen = (int)((*nextName) - name);
        (*nextName)++; /* skip '/' */
        strncpy(n, name, *nameLen);
        n[*nameLen] = 0;
        /*printf("->%s-< [%d] -> [%s]\n", name, *nameLen, *nextName);*/
    }
    else {
        *nameLen = (int)strlen(name);
    }
}

static TestNode *createTestNode( )
{
    TestNode *newNode;

    newNode = (TestNode*)malloc ( sizeof ( TestNode ) );

    newNode->name[0]  = '\0';
    newNode->test = NULL;
    newNode->sibling = NULL;
    newNode->child = NULL;

    return  newNode;
}

void cleanUpTestTree(TestNode *tn) {
    if(tn->child != NULL) {
        cleanUpTestTree(tn->child);
    }
    if(tn->sibling != NULL) {
        cleanUpTestTree(tn->sibling);
    }

    free(tn);
}


void addTest ( TestNode** root,
              TestFunctionPtr test,
              const char* name )
{
    TestNode *newNode;

    /*if this is the first Test created*/
    if (*root == NULL)
        *root = createTestNode();

    newNode = addTestNode( *root, name );
    assert(newNode != 0 );
    /*  printf("addTest: nreName = %s\n", newNode->name );*/

    newNode->test = test;
}

/* non recursive insert function */
static TestNode *addTestNode ( TestNode *root, const char *name )
{
    const char* nextName;
    TestNode *nextNode, *curNode;
    int nameLen; /* length of current 'name' */

    /* remove leading slash */
    if ( *name == TEST_SEPARATOR )
        name++;

    curNode = root;

    for(;;)
    {
        /* Start with the next child */
        nextNode = curNode->child;

        getNextLevel ( name, &nameLen, &nextName );

        /*      printf("* %s\n", name );*/

        /* if nextNode is already null, then curNode has no children
        -- add them */
        if( nextNode == NULL )
        {
            /* Add all children of the node */
            do
            {
                curNode->child = createTestNode ( );

                /* Get the next component of the name */
                getNextLevel ( name, &nameLen, &nextName );

                /* update curName to have the next name segment */
                strncpy ( curNode->child->name , name, nameLen );
                curNode->child->name[nameLen] = 0;
                /* printf("*** added %s\n", curNode->child->name );*/
                curNode = curNode->child;
                name = nextName;
            }
            while( name != NULL );

            return curNode;
        }

        /* Search across for the name */
        while (strncmp_nullcheck ( name, nextNode->name, nameLen) != 0 )
        {
            curNode = nextNode;
            nextNode = nextNode -> sibling;

            if ( nextNode == NULL )
            {
                /* Did not find 'name' on this level. */
                nextNode = createTestNode ( );
                strncpy( nextNode->name, name, nameLen );
                nextNode->name[nameLen] = 0;
                curNode->sibling = nextNode;
                break;
            }
        }

        /* nextNode matches 'name' */

        if (nextName == NULL) /* end of the line */
        {
            return nextNode;
        }

        /* Loop again with the next item */
        name = nextName;
        curNode = nextNode;
    }
}

static void iterateTestsWithLevel ( const TestNode* root,
                 int len,
                 const TestNode** list,
                 TestMode mode)
{
    int i;
    int saveIndent;

    char pathToFunction[MAXTESTNAME] = "";
    char separatorString[2] = { TEST_SEPARATOR, '\0'};

    if ( root == NULL )
        return;

    list[len++] = root;

    for ( i=0;i<(len-1);i++ )
    {
        strcat(pathToFunction, list[i]->name);
        strcat(pathToFunction, separatorString);
    }

    strcat(pathToFunction, list[i]->name);

    INDENT_LEVEL = len;
    if ( (mode == RUNTESTS) && (root->test != NULL))
    {
        int myERROR_COUNT = ERROR_COUNT;
        currentTest = root;
        root->test();
        currentTest = NULL;
        if (myERROR_COUNT != ERROR_COUNT)
        {

            log_info("---[%d ERRORS] ", ERROR_COUNT - myERROR_COUNT);
            strcpy(ERROR_LOG[ERRONEOUS_FUNCTION_COUNT++], pathToFunction);
        }
        else
            log_info("---[OK] ");
    }


    /* we want these messages to be at 0 indent. so just push the indent level breifly. */
    saveIndent = INDENT_LEVEL;
    INDENT_LEVEL = 0;
    log_info("%s%s%c\n", (list[i]->test||mode==SHOWTESTS)?"---":"",pathToFunction, list[i]->test?' ':TEST_SEPARATOR );
    INDENT_LEVEL = saveIndent;

    iterateTestsWithLevel ( root->child, len, list, mode );

    len--;

    if ( len != 0 ) /* DO NOT iterate over siblings of the root. */
        iterateTestsWithLevel ( root->sibling, len, list, mode );
}


void showTests ( const TestNode *root )
{
    /* make up one for them */
    const TestNode *aList[MAXTESTS];

    if (root == NULL)
        log_err("TEST CAN'T BE FOUND!");

    iterateTestsWithLevel ( root, 0, aList, SHOWTESTS );

}

void runTests ( const TestNode *root )
{
    int i;
    const TestNode *aList[MAXTESTS];
    /* make up one for them */


    if (root == NULL)
        log_err("TEST CAN'T BE FOUND!\n");

    ERRONEOUS_FUNCTION_COUNT = ERROR_COUNT = 0;
    iterateTestsWithLevel ( root, 0, aList, RUNTESTS );

    /*print out result summary*/

    if (ERROR_COUNT)
    {
        log_info("\nSUMMARY:\n******* [Total error count:\t%d]\n Errors in\n", ERROR_COUNT);
        for (i=0;i < ERRONEOUS_FUNCTION_COUNT; i++)
            log_info("[%s]\n",ERROR_LOG[i]);
    }
    else
    {
        log_info("\n[All tests passed successfully...]\n");
    }

}

const char* getTestName(void)
{
  if(currentTest != NULL) {
    return currentTest->name;
  } else {
    return NULL;
  }
}

const TestNode* getTest(const TestNode* root, const char* name)
{
    const char* nextName;
    TestNode *nextNode;
    const TestNode* curNode;
    int nameLen; /* length of current 'name' */

    if (root == NULL)
        log_err("TEST CAN'T BE FOUND!\n");
    /* remove leading slash */
    if ( *name == TEST_SEPARATOR )
        name++;

    curNode = root;

    for(;;)
    {
        /* Start with the next child */
        nextNode = curNode->child;

        getNextLevel ( name, &nameLen, &nextName );

        /*      printf("* %s\n", name );*/

        /* if nextNode is already null, then curNode has no children
        -- add them */
        if( nextNode == NULL )
        {
            return NULL;
        }

        /* Search across for the name */
        while (strncmp_nullcheck ( name, nextNode->name, nameLen) != 0 )
        {
            curNode = nextNode;
            nextNode = nextNode -> sibling;

            if ( nextNode == NULL )
            {
                /* Did not find 'name' on this level. */
                return NULL;
            }
        }

        /* nextNode matches 'name' */

        if (nextName == NULL) /* end of the line */
        {
            return nextNode;
        }

        /* Loop again with the next item */
        name = nextName;
        curNode = nextNode;
    }
}

void log_err(const char* pattern, ...)
{
    va_list ap;
    if(strchr(pattern, '\n') != NULL) {
        /*
         * Count errors only if there is a line feed in the pattern
         * so that we do not exaggerate our error count.
         */
        ++ERROR_COUNT;
    }
    if( ERR_MSG == FALSE){
        return;
    }
    va_start(ap, pattern);
    fprintf(stderr, "%-*s", INDENT_LEVEL," " );
    vfprintf(stderr, pattern, ap);
    fflush(stderr);
    va_end(ap);
}

void log_info(const char* pattern, ...)
{
    va_list ap;

    va_start(ap, pattern);
    fprintf(stdout, "%-*s", INDENT_LEVEL," " );
    vfprintf(stdout, pattern, ap);
    fflush(stdout);
    va_end(ap);
}

void log_verbose(const char* pattern, ...)
{
    va_list ap;

    if ( VERBOSITY == FALSE )
        return;

    va_start(ap, pattern);
    fprintf(stdout, "%-*s", INDENT_LEVEL," " );
    vfprintf(stdout, pattern, ap);
    fflush(stdout);
    va_end(ap);
}


int processArgs(const TestNode* root,
             int argc,
             const char* const argv[])
{
    /**
     * This main will parse the l, v, h, n, and path arguments
     */
    const TestNode*    toRun;
    int                i;
    int                doList = FALSE;
    int                subtreeOptionSeen = FALSE;

    int                errorCount = 0;

    toRun = root;
    VERBOSITY = FALSE;
    ERR_MSG = TRUE;

    for( i=1; i<argc; i++)
    {
        if ( argv[i][0] == '/' )
        {
            printf("Selecting subtree '%s'\n", argv[i]);

            if ( argv[i][1] == 0 )
                toRun = root;
            else
                toRun = getTest(root, argv[i]);

            if ( toRun == NULL )
            {
                printf("* Could not find any matching subtree\n");
                return -1;
            }

            if( doList == TRUE)
                showTests(toRun);
            else
                runTests(toRun);

            errorCount += ERROR_COUNT;

            subtreeOptionSeen = TRUE;
        }
        else if (strcmp( argv[i], "-v" )==0 || strcmp( argv[i], "-verbose")==0)
        {
            VERBOSITY = TRUE;
        }
        else if (strcmp( argv[i], "-l" )==0 )
        {
            doList = TRUE;
        }
        else if (strcmp( argv[i], "-e") ==0)
        {
            QUICK = FALSE;
        }
        else if(strcmp( argv[i], "-n") == 0 || strcmp( argv[i], "-no_err_msg") == 0)
        {
            ERR_MSG = FALSE;
        }
        else if (strcmp( argv[i], "-r") == 0)
        {
            if (!REPEAT_TESTS_INIT) {
                REPEAT_TESTS++;
            }
        }
        else if (strcmp( argv[1], "-h" )==0 )
        {
            help( argv[0] );
            return 0;
        }
        else
        {
            printf("* unknown option: %s\n", argv[i]);
            help( argv[0] );
            return -1;
        }
    }

    if( subtreeOptionSeen == FALSE) /* no other subtree given, run the default */
    {
        if( doList == TRUE)
            showTests(toRun);
        else
            runTests(toRun);

        errorCount += ERROR_COUNT;
    }
    else
    {
        if( ( doList == FALSE ) && ( errorCount > 0 ) )
            printf(" Total errors: %d\n", errorCount );
    }

    REPEAT_TESTS_INIT = 1;

    return errorCount; /* total error count */
}

/**
 * Display program invocation arguments
 */

static void help ( const char *argv0 )
{
    printf("Usage: %s [ -l ] [ -v ] [ -verbose] [-a] [ -all] [-n] \n [ -no_err_msg] [ -h ] [ /path/to/test ]\n",
            argv0);
    printf("    -l To get a list of test names\n");
    printf("    -e to do exhaustive testing\n");
    printf("    -verbose To turn ON verbosity\n");
    printf("    -v To turn ON verbosity(same as -verbose)\n");
    printf("    -h To print this message\n");
    printf("    -n To turn OFF printing error messages\n");
    printf("    -no_err_msg (same as -n) \n");
    printf("    -r repeat tests after calling u_cleanup \n");
    printf("    -[/subtest] To run a subtest \n");
    printf("    eg: to run just the utility tests type: cintltest /tsutil) \n");
}