/*
 * Copyright (c) 1988-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 * Copyright (c) 2003, Andrey Kiselev <dron@ak4719.spb.edu>
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 *
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include "libport.h"
#include "tif_config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_OPENGL_GL_H
#include <OpenGL/gl.h>
#else
#ifdef _WIN32
#include <windows.h>
#endif
#include <GL/gl.h>
#endif
#ifdef HAVE_GLUT_GLUT_H
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

#include "tiffio.h"
#include "tiffiop.h"

#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif
#ifndef EXIT_FAILURE
#define EXIT_FAILURE 1
#endif

static uint32_t width = 0, height = 0; /* window width & height */
static uint32_t *raster = NULL;        /* displayable image */
static TIFFRGBAImage img;
static int order0 = 0, order;
static uint16_t photo0 = (uint16_t)-1, photo;
static int stoponerr = 0; /* stop on read error */
static int verbose = 0;
#define TITLE_LENGTH 1024
static char title[TITLE_LENGTH]; /* window title line */
static uint32_t xmax, ymax;
static char **filelist = NULL;
static int fileindex;
static int filenum;
static TIFFErrorHandler oerror;
static TIFFErrorHandler owarning;

static void cleanup_and_exit(int);
static int initImage(void);
static int prevImage(void);
static int nextImage(void);
static void setWindowSize(void);
static void usage(int);
static uint16_t photoArg(const char *);
static void raster_draw(void);
static void raster_reshape(int, int);
static void raster_keys(unsigned char, int, int);
static void raster_special(int, int, int);

#if !HAVE_DECL_OPTARG
extern char *optarg;
extern int optind;
#endif

/* GLUT framework on MacOS X produces deprecation warnings */
#if defined(__GNUC__) && defined(__APPLE__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif

static TIFF *tif = NULL;

int main(int argc, char *argv[])
{
    int c;
    int dirnum = -1;
    uint32_t diroff = 0;

    oerror = TIFFSetErrorHandler(NULL);
    owarning = TIFFSetWarningHandler(NULL);
    while ((c = getopt(argc, argv, "d:o:p:eflmsvwh")) != -1)
        switch (c)
        {
            case 'd':
                dirnum = atoi(optarg);
                break;
            case 'e':
                oerror = TIFFSetErrorHandler(oerror);
                break;
            case 'l':
                order0 = FILLORDER_LSB2MSB;
                break;
            case 'm':
                order0 = FILLORDER_MSB2LSB;
                break;
            case 'o':
                diroff = strtoul(optarg, NULL, 0);
                break;
            case 'p':
                photo0 = photoArg(optarg);
                break;
            case 's':
                stoponerr = 1;
                break;
            case 'w':
                owarning = TIFFSetWarningHandler(owarning);
                break;
            case 'v':
                verbose = 1;
                break;
            case 'h':
                usage(EXIT_SUCCESS);
                /*NOTREACHED*/
                break;
            case '?':
                usage(EXIT_FAILURE);
                /*NOTREACHED*/
                break;
        }
    filenum = argc - optind;
    if (filenum < 1)
        usage(EXIT_FAILURE);

    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

    /*
     * Get the screen size
     */
    xmax = glutGet(GLUT_SCREEN_WIDTH);
    ymax = glutGet(GLUT_SCREEN_HEIGHT);

    /*
     * Use 90% of the screen size
     */
    xmax = xmax - xmax / 10.0;
    ymax = ymax - ymax / 10.0;

    filelist = (char **)_TIFFmalloc(filenum * sizeof(char *));
    if (!filelist)
    {
        TIFFError(argv[0], "Can not allocate space for the file list.");
        return EXIT_FAILURE;
    }
    _TIFFmemcpy(filelist, argv + optind, filenum * sizeof(char *));
    fileindex = -1;
    if (nextImage() < 0)
    {
        _TIFFfree(filelist);
        return EXIT_FAILURE;
    }
    /*
     * Set initial directory if user-specified
     * file was opened successfully.
     */
    if (dirnum != -1 && !TIFFSetDirectory(tif, dirnum))
        TIFFError(argv[0], "Error, seeking to directory %d", dirnum);
    if (diroff != 0 && !TIFFSetSubDirectory(tif, diroff))
        TIFFError(argv[0], "Error, setting subdirectory at %#x", diroff);
    order = order0;
    photo = photo0;
    if (initImage() < 0)
    {
        _TIFFfree(filelist);
        return EXIT_FAILURE;
    }
    /*
     * Create a new window or reconfigure an existing
     * one to suit the image to be displayed.
     */
    glutInitWindowSize(width, height);
    snprintf(title, TITLE_LENGTH - 1, "%s [%u]", filelist[fileindex],
             TIFFCurrentDirectory(tif));
    glutCreateWindow(title);
    glutDisplayFunc(raster_draw);
    glutReshapeFunc(raster_reshape);
    glutKeyboardFunc(raster_keys);
    glutSpecialFunc(raster_special);
    glutMainLoop();

    cleanup_and_exit(EXIT_SUCCESS);
    return EXIT_SUCCESS;
}

static void cleanup_and_exit(int code)
{
    TIFFRGBAImageEnd(&img);
    if (filelist != NULL)
        _TIFFfree(filelist);
    if (raster != NULL)
        _TIFFfree(raster);
    if (tif != NULL)
        TIFFClose(tif);
    exit(code);
}

static int initImage(void)
{
    uint32_t w, h;

    if (order)
        TIFFSetField(tif, TIFFTAG_FILLORDER, order);
    if (photo != (uint16_t)-1)
        TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, photo);
    if (!TIFFRGBAImageBegin(&img, tif, stoponerr, title))
    {
        TIFFError(filelist[fileindex], "%s", title);
        TIFFClose(tif);
        tif = NULL;
        return -1;
    }

    /*
     * Setup the image raster as required.
     */
    h = img.height;
    w = img.width;
    if (h > ymax)
    {
        w = (int)(w * ((float)ymax / h));
        h = ymax;
    }
    if (w > xmax)
    {
        h = (int)(h * ((float)xmax / w));
        w = xmax;
    }

    if (w != width || h != height)
    {
        uint32_t rastersize = _TIFFMultiply32(tif, img.width, img.height,
                                              "allocating raster buffer");
        if (raster != NULL)
            _TIFFfree(raster), raster = NULL;
        raster = (uint32_t *)_TIFFCheckMalloc(tif, rastersize, sizeof(uint32_t),
                                              "allocating raster buffer");
        if (raster == NULL)
        {
            width = height = 0;
            TIFFError(filelist[fileindex], "No space for raster buffer");
            cleanup_and_exit(EXIT_FAILURE);
        }
        width = w;
        height = h;
    }
    TIFFRGBAImageGet(&img, raster, img.width, img.height);
#if HOST_BIGENDIAN
    TIFFSwabArrayOfLong(raster, img.width * img.height);
#endif
    return 0;
}

static int prevImage(void)
{
    if (fileindex > 0)
        fileindex--;
    else if (tif)
        return fileindex;
    if (tif)
        TIFFClose(tif);
    tif = TIFFOpen(filelist[fileindex], "r");
    if (tif == NULL)
        return -1;
    return fileindex;
}

static int nextImage(void)
{
    if (fileindex < filenum - 1)
        fileindex++;
    else if (tif)
        return fileindex;
    if (tif)
        TIFFClose(tif);
    tif = TIFFOpen(filelist[fileindex], "r");
    if (tif == NULL)
        return -1;
    return fileindex;
}

static void setWindowSize(void) { glutReshapeWindow(width, height); }

static void raster_draw(void)
{
    glDrawPixels(img.width, img.height, GL_RGBA, GL_UNSIGNED_BYTE,
                 (const GLvoid *)raster);
    glFlush();
}

static void raster_reshape(int win_w, int win_h)
{
    GLfloat xratio = (GLfloat)win_w / img.width;
    GLfloat yratio = (GLfloat)win_h / img.height;
    int ratio = (int)(((xratio > yratio) ? xratio : yratio) * 100);

    glPixelZoom(xratio, yratio);
    glViewport(0, 0, win_w, win_h);
    snprintf(title, 1024, "%s [%u] %d%%", filelist[fileindex],
             TIFFCurrentDirectory(tif), ratio);
    glutSetWindowTitle(title);
}

static void raster_keys(unsigned char key, int x, int y)
{
    (void)x;
    (void)y;
    switch (key)
    {
        case 'b': /* photometric MinIsBlack */
            photo = PHOTOMETRIC_MINISBLACK;
            initImage();
            break;
        case 'l': /* lsb-to-msb FillOrder */
            order = FILLORDER_LSB2MSB;
            initImage();
            break;
        case 'm': /* msb-to-lsb FillOrder */
            order = FILLORDER_MSB2LSB;
            initImage();
            break;
        case 'w': /* photometric MinIsWhite */
            photo = PHOTOMETRIC_MINISWHITE;
            initImage();
            break;
        case 'W': /* toggle warnings */
            owarning = TIFFSetWarningHandler(owarning);
            initImage();
            break;
        case 'E': /* toggle errors */
            oerror = TIFFSetErrorHandler(oerror);
            initImage();
            break;
        case 'z': /* reset to defaults */
        case 'Z':
            order = order0;
            photo = photo0;
            if (owarning == NULL)
                owarning = TIFFSetWarningHandler(NULL);
            if (oerror == NULL)
                oerror = TIFFSetErrorHandler(NULL);
            initImage();
            break;
        case 'q': /* exit */
        case '\033':
            cleanup_and_exit(EXIT_SUCCESS);
    }
    glutPostRedisplay();
}

static void raster_special(int key, int x, int y)
{
    (void)x;
    (void)y;
    switch (key)
    {
        case GLUT_KEY_PAGE_UP: /* previous logical image */
            if (TIFFCurrentDirectory(tif) > 0)
            {
                if (TIFFSetDirectory(tif, TIFFCurrentDirectory(tif) - 1))
                {
                    initImage();
                    setWindowSize();
                }
            }
            else
            {
                TIFFRGBAImageEnd(&img);
                prevImage();
                initImage();
                setWindowSize();
            }
            break;
        case GLUT_KEY_PAGE_DOWN: /* next logical image */
            if (!TIFFLastDirectory(tif))
            {
                if (TIFFReadDirectory(tif))
                {
                    initImage();
                    setWindowSize();
                }
            }
            else
            {
                TIFFRGBAImageEnd(&img);
                nextImage();
                initImage();
                setWindowSize();
            }
            break;
        case GLUT_KEY_HOME: /* 1st image in current file */
            if (TIFFSetDirectory(tif, 0))
            {
                TIFFRGBAImageEnd(&img);
                initImage();
                setWindowSize();
            }
            break;
        case GLUT_KEY_END: /* last image in current file */
            TIFFRGBAImageEnd(&img);
            while (!TIFFLastDirectory(tif))
                TIFFReadDirectory(tif);
            initImage();
            setWindowSize();
            break;
    }
    glutPostRedisplay();
}

/* GLUT framework on MacOS X produces deprecation warnings */
#if defined(__GNUC__) && defined(__APPLE__)
#pragma GCC diagnostic pop
#endif

static const char *stuff[] = {
    "usage: tiffgt [options] file.tif",
    "where options are:",
    " -c            use colormap visual",
    " -d dirnum     set initial directory (default is 0)",
    " -e            enable display of TIFF error messages",
    " -l            force lsb-to-msb FillOrder",
    " -m            force msb-to-lsb FillOrder",
    " -o offset     set initial directory offset",
    " -p photo      override photometric interpretation",
    " -r            use fullcolor visual",
    " -s            stop decoding on first error (default is ignore errors)",
    " -v            enable verbose mode",
    " -w            enable display of TIFF warning messages",
    NULL};

static void usage(int code)
{
    int i;
    FILE *out = (code == EXIT_SUCCESS) ? stdout : stderr;

    fprintf(out, "%s\n\n", TIFFGetVersion());
    for (i = 0; stuff[i] != NULL; i++)
        fprintf(out, "%s\n", stuff[i]);
    exit(code);
}

static uint16_t photoArg(const char *arg)
{
    if (strcmp(arg, "miniswhite") == 0)
        return (PHOTOMETRIC_MINISWHITE);
    else if (strcmp(arg, "minisblack") == 0)
        return (PHOTOMETRIC_MINISBLACK);
    else if (strcmp(arg, "rgb") == 0)
        return (PHOTOMETRIC_RGB);
    else if (strcmp(arg, "palette") == 0)
        return (PHOTOMETRIC_PALETTE);
    else if (strcmp(arg, "mask") == 0)
        return (PHOTOMETRIC_MASK);
    else if (strcmp(arg, "separated") == 0)
        return (PHOTOMETRIC_SEPARATED);
    else if (strcmp(arg, "ycbcr") == 0)
        return (PHOTOMETRIC_YCBCR);
    else if (strcmp(arg, "cielab") == 0)
        return (PHOTOMETRIC_CIELAB);
    else if (strcmp(arg, "logl") == 0)
        return (PHOTOMETRIC_LOGL);
    else if (strcmp(arg, "logluv") == 0)
        return (PHOTOMETRIC_LOGLUV);
    else
        return ((uint16_t)-1);
}