#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include <errno.h>

#ifdef WIN32

#include <io.h>

#endif

#include <fcntl.h>

#include <gclib/gclib.h>

#include "testcase.h"

#if !HAVE_MKSTEMP

/*

 * An insecure implementation of mkstemp(), for those platforms that

 * don't support it.

 */

int mkstemp(char *template)

{

    int fd;

    char *s;

    for(;;)

    {

	s=str_dup(template);

	mktemp(s);

	if (!*s)

	{

	    errno=EEXIST;

	    mem_free(s);

	    return -1;

	}

	fd=open(s,O_RDWR|O_CREAT|O_EXCL,0600);

	if (fd>0)

	{

	    strcpy(template,s);

	    mem_free(s);

	    return fd;

	}

	else

	    mem_free(s);

    }

}

#endif	/* !HAVE_MKSTEMP */

/*

 * As write(), but always convert NL to CR NL.

 */

static size_t write_text(int fd,const char *buf,size_t count)

{

    size_t i;

    FILE *fp;

    fd=dup(fd);

    if (fd<0)

	return -1;

#ifdef WIN32

    if (_setmode(fd,_O_BINARY)<0)

    {

	close(fd);

	return -1;

    }

#endif

    fp=fdopen(fd,"wb");

    if (!fp)

    {

	close(fd);

	return -1;

    }

    for(i=0;i<count;i++)

    {

	if (buf[i]=='\n')

	    if (putc('\r',fp)==EOF)

	    {

		(void)fclose(fp);

		return -1;

	    }

	if (putc(buf[i],fp)==EOF)

	{

	    (void)fclose(fp);

	    return -1;

	}

    }

    if (fclose(fp))

	return -1;

    return count;

}

/*

 * Return the length (in bytes) or any common prefix between s1 and s2.

 */

size_t common_prefix_length(const char *s1,const char *s2)

{

    size_t i;

    for(i=0;s1[i] && s2[i] && s1[i]==s2[i];i++)

	;

    return i;

}

/*

 * Run a testcase, returning FALSE on fail or error and

 * TRUE on pass or expected-fail.

 * Suitable message(s) will be printed in all cases.

 */

boolean testcase_run(Testcase *testcase)

{

    boolean r;

    int fd,exit_status,col;

    size_t n,pos,offset,header_len;

    FILE *fp;

    char input[]="TEST-XXXXXX";

    char *endp,*bol;

    char *command[3];

    String *expected,*report;

    char *output;

    fd=mkstemp(input);

    if (testcase->input)

	n=strlen(testcase->input);

    else

	n=0;

    if (n && write_text(fd,testcase->input,n)!=n)

    {

	perror(input);

	close(fd);

	(void)remove(input);

	return FALSE;

    }

    close(fd);

    command[0]=getenv("GUTCHECK");

    if (!command[0])

	command[0]="." GC_DIR_SEPARATOR_S "gutcheck";

    command[1]=input;

    command[2]=NULL;

    if (testcase->expected)

	r=spawn_sync(command,&output,&exit_status);

    else

    {

	r=spawn_sync(command,NULL,&exit_status);

	output=NULL;

    }

    (void)remove(input);

    if (!r)

	return FALSE;

    if (testcase->expected)

    {

	expected=string_new("\n\nFile: ");

	string_append(expected,input);

	string_append(expected,"\n\n\n");

	header_len=expected->len;

	string_append(expected,testcase->expected);

    }

    else

    {

	expected=NULL;

	header_len=0;

    }

    if (expected && strcmp(output,expected->str))

    {

	fprintf(stderr,"%s: FAIL\n",testcase->basename);

	offset=common_prefix_length(output,expected->str);

	if (offset==header_len && !output[offset])

	    fprintf(stderr,"Unexpected zero warnings from gutcheck.\n");

	else

	{

	    endp=strchr(output+offset,'\n');

	    if (!endp)

		endp=output+strlen(output);

	    report=string_new(NULL);

	    string_append_len(report,output,endp-output);

	    bol=strrchr(report->str,'\n');

	    if (bol)

		bol++;

	    else

		bol=report->str;

	    col=offset-(bol-report->str);

	    fprintf(stderr,"Unexpected output from gutcheck:\n");

	    if (report->len>=header_len)

		fprintf(stderr,"%s\n%*s^\n",report->str+header_len,col,"");

	    else

		fprintf(stderr,"%s\n%*s^\n",report->str,col,"");

	    string_free(report,TRUE);

	}

	string_free(expected,TRUE);

	mem_free(output);

	return FALSE;

    }

    string_free(expected,TRUE);

    mem_free(output);

    if (exit_status)

	fprintf(stderr,"gutcheck exited with code %d\n",r);

    if (!exit_status)

	fprintf(stderr,"%s: PASS\n",testcase->basename);

    return !exit_status;

}

/*

 * Free a testcase.

 */

void testcase_free(Testcase *testcase)

{

    mem_free(testcase->basename);

    mem_free(testcase->input);

    mem_free(testcase->expected);

    mem_free(testcase);

}