///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////


//-----------------------------------------------------------------------------
//
//	exrmakepreview -- a program that inserts a
//	preview image into an OpenEXR file's header.
//
//-----------------------------------------------------------------------------

#include "makePreview.h"

#include <iostream>
#include <exception>
#include <stdlib.h>
#include <string.h>

using namespace std;


void
usageMessage (const char argv0[], bool verbose = false)
{
    cerr << "usage: " << argv0 << " [options] infile outfile" << endl;

    if (verbose)
    {
	cerr << "\n"
		"Reads an OpenEXR image from infile, generates a preview\n"
		"image, adds it to the image's header, and saves the result\n"
		"in outfile.  Infile and outfile must not refer to the same\n"
		"file (the program cannot edit an image file \"in place\").\n"
		"\n"
		"Options:\n"
		"\n"
		"-w x      sets the width of the preview image to x pixels\n"
		"          (default is 100)\n"
		"\n"
		"-e s      adjusts the preview image's exposure by s f-stops\n"
		"          (default is 0).  Positive values make the image\n"
		"          brighter, negative values make it darker.\n"
		"\n"
		"-v        verbose mode\n"
		"\n"
		"-h        prints this message\n";

	 cerr << endl;
    }

    exit (1);
}


int
main(int argc, char **argv)
{
    const char *inFile = 0;
    const char *outFile = 0;
    int previewWidth = 100;
    float exposure = 0;
    bool verbose = false;

    //
    // Parse the command line.
    //

    if (argc < 2)
	usageMessage (argv[0], true);

    int i = 1;

    while (i < argc)
    {
	if (!strcmp (argv[i], "-w"))
	{
	    //
	    // Set preview image width
	    //

	    if (i > argc - 2)
		usageMessage (argv[0]);

	    previewWidth = strtol (argv[i + 1], 0, 0);
	    i += 2;
	}
	else if (!strcmp (argv[i], "-e"))
	{
	    //
	    // Set preview image width
	    //

	    if (i > argc - 2)
		usageMessage (argv[0]);

	    exposure = strtod (argv[i + 1], 0);
	    i += 2;
	}
	else if (!strcmp (argv[i], "-v"))
	{
	    //
	    // Verbose mode
	    //

	    verbose = true;
	    i += 1;
	}
	else if (!strcmp (argv[i], "-h"))
	{
	    //
	    // Print help message
	    //

	    usageMessage (argv[0], true);
	}
	else
	{
	    //
	    // Image file name
	    //

	    if (inFile == 0)
		inFile = argv[i];
	    else
		outFile = argv[i];

	    i += 1;
	}
    }

    if (inFile == 0 || outFile == 0)
	usageMessage (argv[0]);

    if (!strcmp (inFile, outFile))
    {
	cerr << "Input and output cannot be the same file." << endl;
	return 1;
    }

    if (previewWidth <= 0)
    {
	cerr << "Preview image width must be greather than zero." << endl;
	return 1;
    }

    //
    // Load inFile, add a preview image, and save the result in outFile.
    //

    int exitStatus = 0;

    try
    {
	makePreview (inFile, outFile, previewWidth, exposure, verbose);
    }
    catch (const exception &e)
    {
	cerr << e.what() << endl;
	exitStatus = 1;
    }

    return exitStatus;
}