///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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///////////////////////////////////////////////////////////////////////////


//-----------------------------------------------------------------------------
//
//      exrenvmap -- makes OpenEXR environment maps
//
//-----------------------------------------------------------------------------

#include <makeCubeMap.h>
#include <makeLatLongMap.h>
#include <blurImage.h>
#include <EnvmapImage.h>
#include <ImfEnvmap.h>
#include <ImfHeader.h>

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

#include "namespaceAlias.h"
using namespace IMF;
using namespace std;


namespace {

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

    if (verbose)
    {
        cerr << "\n"
                "Converts OpenEXR latitude-longitude environment maps\n"
                "into cube-face environment maps or vice versa.\n"
                "Reads an environment map image from infile, converts\n"
                "it, and stores the result in outfile.\n"
                "\n"
                "If the input file name contains a '%' character, then an\n"
                "input cube-face environment map is assembled from six\n"
                "square sub-images that represent the six faces of the cube.\n"
                "The names of the six image files are generated by replacing\n"
                "the % with +X, -X, +Y, -Y, +Z and -Z respectively.\n"
                "\n"
                "If the output file name contains a '%' character and\n"
                "the program has been instructed to produce a cube-face\n"
                "environment map, then the output image is split into six\n"
                "square sub-images that are saved in six separate output\n"
                "files.  The names of the files are generated by replacing\n"
                "the % with +X, -X, +Y, -Y, +Z and -Z respectively.\n"
                "\n"
                "Options:\n"
                "\n"
                "-o         produces a ONE_LEVEL output file (default)\n"
                "\n"
                "-m         produces a MIPMAP_LEVELS output file (-m has\n"
                "           no effect if the output image is split into\n"
                "           multiple files)\n"
                "\n"
                "-c         the output file will be a cube-face environment\n"
                "           map (default)\n"
                "\n"
                "-l         the output file will be a latitude-longitude\n"
                "           environment map\n"
                "\n"
                "-ci        the input file is interpreted as a cube-face\n"
                "           environment map, regardless of its envmap\n"
                "           attribute\n"
                "\n"
                "-li        the input file is interpreted as a latitude-\n"
                "           longitude environment map, regardless of its\n"
                "           envmap attribute (-li has no effect if the\n"
                "           input image is assembled from multiple files)\n"
                "\n"
                "-w x       sets the width of the output image to x pixels\n"
                "           (default is 256).  The height of the output image\n"
                "           will be x*6 pixels for a cube-face map, or x/2\n"
                "           pixels for a latitude-longitude map.\n"
                "\n"
                "-f r n     sets the antialiasing filter radius to r\n"
                "           (default is 1.0) and the sampling rate to\n"
                "           n by n (default is 5 by 5).  Increasing r\n"
                "           makes the output image blurrier; decreasing r\n"
                "           makes the image sharper but may cause aliasing.\n"
                "           Increasing n improves antialiasing, but\n"
                "           generating the output image takes longer.\n"
                "\n"
                "-b         blurs the environment map image by applying a\n"
                "           180-degree-wide filter kernel such that point-\n"
                "           sampling the blurred image at a location that\n"
                "           corresponds to 3D direction N returns the color\n"
                "           that a white diffuse reflector with surface\n"
                "           normal N would have if it was illuminated using\n"
                "           the original non-blurred image.\n"
                "           Generating the blurred image can be fairly slow.\n"
                "\n"
                "-t x y     sets the output file's tile size to x by y pixels\n"
                "           (default is 64 by 64)\n"
                "\n"
                "-p t b     if the input image is a latitude-longitude map,\n"
                "           pad the image at the top and bottom with t*h\n"
                "           and b*h extra scan lines, where h is the height\n"
                "           of the input image.  This is useful for images\n"
                "           from 360-degree panoramic scans that cover\n"
                "           less than 180 degrees vertically.\n"
                "\n"
                "-d         sets level size rounding to ROUND_DOWN (default)\n"
                "\n"
                "-u         sets level size rounding to ROUND_UP\n"
                "\n"
                "-z x       sets the data compression method to x\n"
                "           (none/rle/zip/piz/pxr24/b44/b44a/dwaa/dwab,\n"
                "           default is zip)\n"
                "\n"
                "-v         verbose mode\n"
                "\n"
                "-h         prints this message\n";

         cerr << endl;
    }

    exit (1);
}


Compression
getCompression (const string &str)
{
    Compression c;

    if (str == "no" || str == "none" || str == "NO" || str == "NONE")
    {
        c = NO_COMPRESSION;
    }
    else if (str == "rle" || str == "RLE")
    {
        c = RLE_COMPRESSION;
    }
    else if (str == "zip" || str == "ZIP")
    {
        c = ZIP_COMPRESSION;
    }
    else if (str == "piz" || str == "PIZ")
    {
        c = PIZ_COMPRESSION;
    }
    else if (str == "pxr24" || str == "PXR24")
    {
        c = PXR24_COMPRESSION;
    }
    else if (str == "b44" || str == "B44")
    {
        c = B44_COMPRESSION;
    }
    else if (str == "b44a" || str == "B44A")
    {
        c = B44A_COMPRESSION;
    }
    else if (str == "dwaa" || str == "DWAA")
    {
        c = DWAA_COMPRESSION;
    }
    else if (str == "dwab" || str == "DWAB")
    {
        c = DWAB_COMPRESSION;
    }
    else
    {
        cerr << "Unknown compression method \"" << str << "\"." << endl;
        exit (1);
    }

    return c;
}

} // namespace


int
main(int argc, char **argv)
{
    const char *inFile = 0;
    const char *outFile = 0;
    Envmap type = ENVMAP_CUBE;
    Envmap overrideInputType = NUM_ENVMAPTYPES;
    LevelMode levelMode = ONE_LEVEL;
    LevelRoundingMode roundingMode = ROUND_DOWN;
    Compression compression = ZIP_COMPRESSION;
    int mapWidth = 256;
    int tileWidth = 64;
    int tileHeight = 64;
    float padTop = 0;
    float padBottom = 0;
    float filterRadius = 1;
    int numSamples = 5;
    bool diffuseBlur = false;
    bool verbose = false;

    //
    // Parse the command line.
    //

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

    int i = 1;

    while (i < argc)
    {
        if (!strcmp (argv[i], "-o"))    
        {
            //
            // generate a ONE_LEVEL image
            //

            levelMode = ONE_LEVEL;
            i += 1;
        }
        else if (!strcmp (argv[i], "-m"))
        {
            //
            // Generate a MIPMAP_LEVELS image
            //

            levelMode = MIPMAP_LEVELS;
            i += 1;
        }
        else if (!strcmp (argv[i], "-c"))
        {
            //
            // Generate a cube-face map
            //

            type = ENVMAP_CUBE;
            i += 1;
        }
        else if (!strcmp (argv[i], "-l"))
        {
            //
            // Generate a latitude-longitude map
            //

            type = ENVMAP_LATLONG;
            i += 1;
        }
        else if (!strcmp (argv[i], "-ci"))
        {
            //
            // Assume input is a cube-face map
            //

            overrideInputType = ENVMAP_CUBE;
            i += 1;
        }
        else if (!strcmp (argv[i], "-li"))
        {
            //
            // Assume input is a latitude-longitude map
            //

            overrideInputType = ENVMAP_LATLONG;
            i += 1;
        }
        else if (!strcmp (argv[i], "-w"))
        {
            //
            // Set output image width
            //

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

            mapWidth = strtol (argv[i + 1], 0, 0);

            if (mapWidth <= 0)
            {
                cerr << "Output image width must be greater than zero." << endl;
                return 1;
            }

            i += 2;
        }
        else if (!strcmp (argv[i], "-f"))
        {
            //
            // Set filter radius and supersampling rate
            //

            if (i > argc - 3)
                usageMessage (argv[0]);

            filterRadius = strtod (argv[i + 1], 0);
            numSamples   = strtol (argv[i + 2], 0, 0);

            if (filterRadius < 0)
            {
                cerr << "Filter radius must not be less than zero." << endl;
                return 1;
            }

            if (numSamples <= 0)
            {
                cerr << "Sampling rate must be greater than zero." << endl;
                return 1;
            }

            i += 3;
        }
        else if (!strcmp (argv[i], "-b"))
        {
            //
            // Diffuse blur
            //

            diffuseBlur = true;
            i += 1;
        }
        else if (!strcmp (argv[i], "-t"))
        {
            //
            // Set tile size
            //

            if (i > argc - 3)
                usageMessage (argv[0]);

            tileWidth  = strtol (argv[i + 1], 0, 0);
            tileHeight = strtol (argv[i + 2], 0, 0);

            if (tileWidth <= 0 || tileHeight <= 0)
            {
                cerr << "Tile size must be greater than zero." << endl;
                return 1;
            }

            i += 3;
        }
        else if (!strcmp (argv[i], "-p"))
        {
            //
            // Set top and bottom padding
            //

            if (i > argc - 3)
                usageMessage (argv[0]);

            padTop    = strtod (argv[i + 1], 0);
            padBottom = strtod (argv[i + 2], 0);

            if (padTop < 0 || padBottom < 0)
            {
                cerr << "Padding must not be less than zero." << endl;
                return 1;
            }

            i += 3;
        }
        else if (!strcmp (argv[i], "-d"))
        {
            //
            // Round down
            //

            roundingMode = ROUND_DOWN;
            i += 1;
        }
        else if (!strcmp (argv[i], "-u"))
        {
            //
            // Round down
            //

            roundingMode = ROUND_UP;
            i += 1;
        }
        else if (!strcmp (argv[i], "-z"))
        {
            //
            // Set compression method
            //

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

            compression = getCompression (argv[i + 1]);
            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]);

    //
    // Load inFile, convert it, and save the result in outFile.
    //

    int exitStatus = 0;

    try
    {
        EnvmapImage image;
        Header header;
        RgbaChannels channels;

        readInputImage (inFile, padTop, padBottom,
                        overrideInputType, verbose,
                        image, header, channels);

        if (diffuseBlur)
            blurImage (image, verbose);

        if (type == ENVMAP_CUBE)
        {
            makeCubeMap (image, header, channels,
                         outFile,
                         tileWidth, tileHeight,
                         levelMode, roundingMode,
                         compression, mapWidth,
                         filterRadius, numSamples,
                         verbose);
        }
        else
        {
            makeLatLongMap (image, header, channels,
                            outFile,
                            tileWidth, tileHeight,
                            levelMode, roundingMode,
                            compression, mapWidth,
                            filterRadius, numSamples,
                            verbose);
        }
    }
    catch (const exception &e)
    {
        cerr << e.what() << endl;
        exitStatus = 1;
    }

    return exitStatus;
}