/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "prio.h"
#include "prmem.h"
#include "prprf.h"
#include "prinit.h"
#include "prerror.h"
#include "prthread.h"

#include "plerror.h"
#include "plgetopt.h"

#define DEFAULT_COUNT 10
#define DEFAULT_FILESIZE 1
#define BUFFER_SIZE 1000000

typedef enum {v_silent, v_whisper, v_shout} Verbosity;
static void Verbose(Verbosity, const char*, const char*, PRIntn);

#define VERBOSE(_l, _m) Verbose(_l, _m, __FILE__, __LINE__)

static PRIntn test_result = 2;
static PRFileDesc *output = NULL;
static PRIntn verbose = v_silent;
static PRIntn filesize = DEFAULT_FILESIZE;

static PRIntn Usage(void)
{
    PR_fprintf(output, "Bigfile test usage:\n");
    PR_fprintf(output, ">bigfile [-G] [-d] [-v[*v]] [-s <n>] <filename>\n");
    PR_fprintf(output, "\td\tdebug mode (equivalent to -vvv)\t(false)\n");
    PR_fprintf(output, "\tv\tAdditional levels of output\t(none)\n");
    PR_fprintf(output, "\tk\tKeep data file after exit\t(false)\n");
    PR_fprintf(output, "\ts <n>\tFile size in megabytes\t\t(1 megabyte)\n");
    PR_fprintf(output, "\t<filename>\tName of test file\t(none)\n");
    return 2;  /* nothing happened */
}  /* Usage */

static PRStatus DeleteIfFound(const char *filename)
{
    PRStatus rv;
    VERBOSE(v_shout, "Checking for existing file");
    rv = PR_Access(filename, PR_ACCESS_WRITE_OK);
    if (PR_SUCCESS == rv)
    {
        VERBOSE(v_shout, "Deleting existing file");
        rv = PR_Delete(filename);
        if (PR_FAILURE == rv) {
            VERBOSE(v_shout, "Cannot delete big file");
        }
    }
    else if (PR_FILE_NOT_FOUND_ERROR !=  PR_GetError()) {
        VERBOSE(v_shout, "Cannot access big file");
    }
    else {
        rv = PR_SUCCESS;
    }
    return rv;
}  /* DeleteIfFound */

static PRIntn Error(const char *msg, const char *filename)
{
    PRInt32 error = PR_GetError();
    if (NULL != msg)
    {
        if (0 == error) {
            PR_fprintf(output, msg);
        }
        else {
            PL_FPrintError(output, msg);
        }
    }
    (void)DeleteIfFound(filename);
    if (v_shout == verbose) {
        PR_Abort();
    }
    return 1;
}  /* Error */

static void Verbose(
    Verbosity level, const char *msg, const char *file, PRIntn line)
{
    if (level <= verbose) {
        PR_fprintf(output, "[%s : %d]: %s\n", file, line, msg);
    }
}  /* Verbose */

static void PrintInfo(PRFileInfo64 *info, const char *filename)
{
    PRExplodedTime tm;
    char ctime[40], mtime[40];
    static const char *types[] = {"FILE", "DIRECTORY", "OTHER"};
    PR_fprintf(
        output, "[%s : %d]: File info for %s\n",
        __FILE__, __LINE__, filename);
    PR_fprintf(
        output, "    type: %s, size: %llu bytes,\n",
        types[info->type - 1], info->size);

    PR_ExplodeTime(info->creationTime, PR_GMTParameters, &tm);
    (void)PR_FormatTime(ctime, sizeof(ctime), "%c GMT", &tm);
    PR_ExplodeTime(info->modifyTime, PR_GMTParameters, &tm);
    (void)PR_FormatTime(mtime, sizeof(mtime), "%c GMT", &tm);

    PR_fprintf(
        output, "    creation: %s,\n    modify: %s\n", ctime, mtime);
}  /* PrintInfo */

int main(int argc, char **argv)
{
    PRStatus rv;
    char *buffer;
    PLOptStatus os;
    PRInt32 loop, bytes;
    PRFileInfo small_info;
    PRFileInfo64 big_info;
    PRBool keep = PR_FALSE;
    PRFileDesc *file = NULL;
    const char *filename = NULL;
    PRIntn count = DEFAULT_COUNT;
    PRInt64 filesize64, big_answer, big_size, one_meg, zero_meg, big_fragment;
    PRInt64 sevenFox = LL_INIT(0,0x7fffffff);

    PLOptState *opt = PL_CreateOptState(argc, argv, "dtvhs:");

    output = PR_GetSpecialFD(PR_StandardError);
    PR_STDIO_INIT();

    while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
    {
        if (PL_OPT_BAD == os) {
            continue;
        }
        switch (opt->option)
        {
            case 0:
                filename = opt->value;
                break;
            case 'd':  /* debug mode */
                verbose = v_shout;
                break;
            case 'k':  /* keep file */
                keep = PR_TRUE;
                break;
            case 'v':  /* verbosity */
                if (v_shout > verbose) {
                    verbose += 1;
                }
                break;
            case 'c':  /* loop counter */
                count = atoi(opt->value);
                break;
            case 's':  /* filesize */
                filesize = atoi(opt->value);
                break;
            case 'h':  /* confused */
            default:
                return Usage();
        }
    }
    PL_DestroyOptState(opt);

    if (0 == count) {
        count = DEFAULT_COUNT;
    }
    if (0 == filesize) {
        filesize = DEFAULT_FILESIZE;
    }
    if (NULL == filename)
    {
#define FILE_NAME "bigfile.dat"
        if (DEFAULT_FILESIZE != filesize) {
            return Usage();
        }
        else {
            filename = FILE_NAME;
        }
    }

    if (PR_FAILURE == DeleteIfFound(filename)) {
        return 1;
    }

    test_result = 0;

    LL_I2L(zero_meg, 0);
    LL_I2L(one_meg, 1000000);
    LL_I2L(filesize64, filesize);
    buffer = (char*)PR_MALLOC(BUFFER_SIZE);
    LL_I2L(big_fragment, BUFFER_SIZE);
    LL_MUL(filesize64, filesize64, one_meg);

    for (loop = 0; loop < BUFFER_SIZE; ++loop) {
        buffer[loop] = (char)loop;
    }

    VERBOSE(v_whisper, "Creating big file");
    file = PR_Open(filename, PR_CREATE_FILE | PR_WRONLY, 0666);
    if (NULL == file) {
        return Error("PR_Open()", filename);
    }

    VERBOSE(v_whisper, "Testing available space in empty file");
    big_answer = file->methods->available64(file);
    if (!LL_IS_ZERO(big_answer)) {
        return Error("empty available64()", filename);
    }

    LL_SUB(big_size, filesize64, one_meg);
    VERBOSE(v_whisper, "Creating sparse big file by seeking to end");
    big_answer = file->methods->seek64(file, big_size, PR_SEEK_SET);
    if (!LL_EQ(big_answer, big_size)) {
        return Error("seek", filename);
    }

    VERBOSE(v_whisper, "Writing block at end of sparse file");
    bytes = file->methods->write(file, buffer, BUFFER_SIZE);
    if (bytes != BUFFER_SIZE) {
        return Error("write", filename);
    }

    VERBOSE(v_whisper, "Testing available space at end of sparse file");
    big_answer = file->methods->available64(file);
    if (!LL_IS_ZERO(big_answer)) {
        return Error("eof available64()", filename);
    }

    VERBOSE(v_whisper, "Getting big info on sparse big file");
    rv = file->methods->fileInfo64(file, &big_info);
    if (PR_FAILURE == rv) {
        return Error("fileInfo64()", filename);
    }
    if (v_shout <= verbose) {
        PrintInfo(&big_info, filename);
    }

    VERBOSE(v_whisper, "Getting small info on sparse big file");
    rv = file->methods->fileInfo(file, &small_info);
    if (LL_CMP(sevenFox, <, filesize64) && (PR_SUCCESS == rv))
    {
        VERBOSE(v_whisper, "Should have failed and didn't");
        return Error("fileInfo()", filename);
    }
    else if (LL_CMP(sevenFox, >, filesize64) && (PR_FAILURE == rv))
    {
        VERBOSE(v_whisper, "Should have succeeded and didn't");
        return Error("fileInfo()", filename);
    }

    VERBOSE(v_whisper, "Rewinding big file");
    big_answer = file->methods->seek64(file, zero_meg, PR_SEEK_SET);
    if (!LL_IS_ZERO(big_answer)) {
        return Error("rewind seek64()", filename);
    }

    VERBOSE(v_whisper, "Establishing available space in rewound file");
    big_answer = file->methods->available64(file);
    if (LL_NE(filesize64, big_answer)) {
        return Error("bof available64()", filename);
    }

    VERBOSE(v_whisper, "Closing big file");
    rv = file->methods->close(file);
    if (PR_FAILURE == rv) {
        return Error("close()", filename);
    }

    VERBOSE(v_whisper, "Reopening big file");
    file = PR_Open(filename, PR_RDWR, 0666);
    if (NULL == file) {
        return Error("open failed", filename);
    }

    VERBOSE(v_whisper, "Checking available data in reopened file");
    big_answer = file->methods->available64(file);
    if (LL_NE(filesize64, big_answer)) {
        return Error("reopened available64()", filename);
    }

    big_answer = zero_meg;
    VERBOSE(v_whisper, "Rewriting every byte of big file data");
    do
    {
        bytes = file->methods->write(file, buffer, BUFFER_SIZE);
        if (bytes != BUFFER_SIZE) {
            return Error("write", filename);
        }
        LL_ADD(big_answer, big_answer, big_fragment);
    } while (LL_CMP(big_answer, <, filesize64));

    VERBOSE(v_whisper, "Checking position at eof");
    big_answer = file->methods->seek64(file, zero_meg, PR_SEEK_CUR);
    if (LL_NE(big_answer, filesize64)) {
        return Error("file size error", filename);
    }

    VERBOSE(v_whisper, "Testing available space at eof");
    big_answer = file->methods->available64(file);
    if (!LL_IS_ZERO(big_answer)) {
        return Error("eof available64()", filename);
    }

    VERBOSE(v_whisper, "Rewinding full file");
    big_answer = file->methods->seek64(file, zero_meg, PR_SEEK_SET);
    if (!LL_IS_ZERO(big_answer)) {
        return Error("bof seek64()", filename);
    }

    VERBOSE(v_whisper, "Testing available space in rewound file");
    big_answer = file->methods->available64(file);
    if (LL_NE(big_answer, filesize64)) {
        return Error("bof available64()", filename);
    }

    VERBOSE(v_whisper, "Seeking to end of big file");
    big_answer = file->methods->seek64(file, filesize64, PR_SEEK_SET);
    if (LL_NE(big_answer, filesize64)) {
        return Error("eof seek64()", filename);
    }

    VERBOSE(v_whisper, "Getting info on big file while it's open");
    rv = file->methods->fileInfo64(file, &big_info);
    if (PR_FAILURE == rv) {
        return Error("fileInfo64()", filename);
    }
    if (v_shout <= verbose) {
        PrintInfo(&big_info, filename);
    }

    VERBOSE(v_whisper, "Closing big file");
    rv = file->methods->close(file);
    if (PR_FAILURE == rv) {
        return Error("close()", filename);
    }

    VERBOSE(v_whisper, "Getting info on big file after it's closed");
    rv = PR_GetFileInfo64(filename, &big_info);
    if (PR_FAILURE == rv) {
        return Error("fileInfo64()", filename);
    }
    if (v_shout <= verbose) {
        PrintInfo(&big_info, filename);
    }

    VERBOSE(v_whisper, "Deleting big file");
    rv = PR_Delete(filename);
    if (PR_FAILURE == rv) {
        return Error("PR_Delete()", filename);
    }

    PR_DELETE(buffer);
    return test_result;
} /* main */

/* bigfile.c */