/*
  Copyright 2008 Larry Gritz and the other authors and contributors.
  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 the software's owners 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.

  (This is the Modified BSD License)
*/

/// \file
/// Implementation of ImageBufAlgo algorithms that merely move pixels
/// or channels between images without altering their values.


#include <OpenEXR/half.h>

#include <cmath>
#include <iostream>

#include <OpenImageIO/deepdata.h>
#include <OpenImageIO/imagebuf.h>
#include <OpenImageIO/imagebufalgo.h>
#include <OpenImageIO/imagebufalgo_util.h>
#include <OpenImageIO/thread.h>

#include "imageio_pvt.h"


OIIO_NAMESPACE_BEGIN


template<class D, class S = D>
static bool
flip_(ImageBuf& dst, const ImageBuf& src, ROI dst_roi, int nthreads)
{
    ROI src_roi_full = src.roi_full();
    ROI dst_roi_full = dst.roi_full();
    ImageBuf::ConstIterator<S, D> s(src);
    ImageBuf::Iterator<D, D> d(dst, dst_roi);
    for (; !d.done(); ++d) {
        int yy = d.y() - dst_roi_full.ybegin;
        s.pos(d.x(), src_roi_full.yend - 1 - yy, d.z());
        for (int c = dst_roi.chbegin; c < dst_roi.chend; ++c)
            d[c] = s[c];
    }
    return true;
}


bool
ImageBufAlgo::flip(ImageBuf& dst, const ImageBuf& src, ROI roi, int nthreads)
{
    if (&dst == &src) {  // Handle in-place operation
        ImageBuf tmp;
        tmp.swap(const_cast<ImageBuf&>(src));
        return flip(dst, tmp, roi, nthreads);
    }
    pvt::LoggedTimer logtime("IBA::flip");

    ROI src_roi      = roi.defined() ? roi : src.roi();
    ROI src_roi_full = src.roi_full();
    int offset       = src_roi.ybegin - src_roi_full.ybegin;
    int start        = src_roi_full.yend - offset - src_roi.height();
    ROI dst_roi(src_roi.xbegin, src_roi.xend, start, start + src_roi.height(),
                src_roi.zbegin, src_roi.zend, src_roi.chbegin, src_roi.chend);
    ASSERT(dst_roi.width() == src_roi.width()
           && dst_roi.height() == src_roi.height());

    // Compute the destination ROI, it's the source ROI reflected across
    // the midline of the display window.
    if (!IBAprep(dst_roi, &dst, &src))
        return false;
    bool ok;
    OIIO_DISPATCH_COMMON_TYPES2(ok, "flip", flip_, dst.spec().format,
                                src.spec().format, dst, src, dst_roi, nthreads);
    return ok;
}



template<class D, class S = D>
static bool
flop_(ImageBuf& dst, const ImageBuf& src, ROI dst_roi, int nthreads)
{
    ROI src_roi_full = src.roi_full();
    ROI dst_roi_full = dst.roi_full();
    ImageBuf::ConstIterator<S, D> s(src);
    ImageBuf::Iterator<D, D> d(dst, dst_roi);
    for (; !d.done(); ++d) {
        int xx = d.x() - dst_roi_full.xbegin;
        s.pos(src_roi_full.xend - 1 - xx, d.y(), d.z());
        for (int c = dst_roi.chbegin; c < dst_roi.chend; ++c)
            d[c] = s[c];
    }
    return true;
}


bool
ImageBufAlgo::flop(ImageBuf& dst, const ImageBuf& src, ROI roi, int nthreads)
{
    if (&dst == &src) {  // Handle in-place operation
        ImageBuf tmp;
        tmp.swap(const_cast<ImageBuf&>(src));
        return flop(dst, tmp, roi, nthreads);
    }

    pvt::LoggedTimer logtime("IBA::flop");
    ROI src_roi      = roi.defined() ? roi : src.roi();
    ROI src_roi_full = src.roi_full();
    int offset       = src_roi.xbegin - src_roi_full.xbegin;
    int start        = src_roi_full.xend - offset - src_roi.width();
    ROI dst_roi(start, start + src_roi.width(), src_roi.ybegin, src_roi.yend,
                src_roi.zbegin, src_roi.zend, src_roi.chbegin, src_roi.chend);
    ASSERT(dst_roi.width() == src_roi.width()
           && dst_roi.height() == src_roi.height());

    // Compute the destination ROI, it's the source ROI reflected across
    // the midline of the display window.
    if (!IBAprep(dst_roi, &dst, &src))
        return false;
    bool ok;
    OIIO_DISPATCH_COMMON_TYPES2(ok, "flop", flop_, dst.spec().format,
                                src.spec().format, dst, src, dst_roi, nthreads);
    return ok;
}



ImageBuf
ImageBufAlgo::flip(const ImageBuf& src, ROI roi, int nthreads)
{
    ImageBuf result;
    bool ok = flip(result, src, roi, nthreads);
    if (!ok && !result.has_error())
        result.error("ImageBufAlgo::flip() error");
    return result;
}



ImageBuf
ImageBufAlgo::flop(const ImageBuf& src, ROI roi, int nthreads)
{
    ImageBuf result;
    bool ok = flop(result, src, roi, nthreads);
    if (!ok && !result.has_error())
        result.error("ImageBufAlgo::flop() error");
    return result;
}



template<class D, class S = D>
static bool
rotate90_(ImageBuf& dst, const ImageBuf& src, ROI dst_roi, int nthreads)
{
    ROI dst_roi_full = dst.roi_full();
    ImageBuf::ConstIterator<S, D> s(src);
    ImageBuf::Iterator<D, D> d(dst, dst_roi);
    for (; !d.done(); ++d) {
        s.pos(d.y(), dst_roi_full.xend - d.x() - 1, d.z());
        for (int c = dst_roi.chbegin; c < dst_roi.chend; ++c)
            d[c] = s[c];
    }
    return true;
}


bool
ImageBufAlgo::rotate90(ImageBuf& dst, const ImageBuf& src, ROI roi,
                       int nthreads)
{
    if (&dst == &src) {  // Handle in-place operation
        ImageBuf tmp;
        tmp.swap(const_cast<ImageBuf&>(src));
        return rotate90(dst, tmp, roi, nthreads);
    }

    pvt::LoggedTimer logtime("IBA::rotate90");
    ROI src_roi      = roi.defined() ? roi : src.roi();
    ROI src_roi_full = src.roi_full();

    // Rotated full ROI swaps width and height, and keeps its origin
    // where the original origin was.
    ROI dst_roi_full(src_roi_full.xbegin,
                     src_roi_full.xbegin + src_roi_full.height(),
                     src_roi_full.ybegin,
                     src_roi_full.ybegin + src_roi_full.width(),
                     src_roi_full.zbegin, src_roi_full.zend,
                     src_roi_full.chbegin, src_roi_full.chend);

    ROI dst_roi(src_roi_full.yend - src_roi.yend,
                src_roi_full.yend - src_roi.ybegin, src_roi.xbegin,
                src_roi.xend, src_roi.zbegin, src_roi.zend, src_roi.chbegin,
                src_roi.chend);
    ASSERT(dst_roi.width() == src_roi.height()
           && dst_roi.height() == src_roi.width());

    bool dst_initialized = dst.initialized();
    if (!IBAprep(dst_roi, &dst, &src))
        return false;
    if (!dst_initialized)
        dst.set_roi_full(dst_roi_full);

    bool ok;
    OIIO_DISPATCH_COMMON_TYPES2(ok, "rotate90", rotate90_, dst.spec().format,
                                src.spec().format, dst, src, dst_roi, nthreads);
    return ok;
}



template<class D, class S = D>
static bool
rotate180_(ImageBuf& dst, const ImageBuf& src, ROI dst_roi, int nthreads)
{
    ROI src_roi_full = src.roi_full();
    ROI dst_roi_full = dst.roi_full();
    ImageBuf::ConstIterator<S, D> s(src);
    ImageBuf::Iterator<D, D> d(dst, dst_roi);
    for (; !d.done(); ++d) {
        int xx = d.x() - dst_roi_full.xbegin;
        int yy = d.y() - dst_roi_full.ybegin;
        s.pos(src_roi_full.xend - 1 - xx, src_roi_full.yend - 1 - yy, d.z());
        for (int c = dst_roi.chbegin; c < dst_roi.chend; ++c)
            d[c] = s[c];
    }
    return true;
}


bool
ImageBufAlgo::rotate180(ImageBuf& dst, const ImageBuf& src, ROI roi,
                        int nthreads)
{
    if (&dst == &src) {  // Handle in-place operation
        ImageBuf tmp;
        tmp.swap(const_cast<ImageBuf&>(src));
        return rotate180(dst, tmp, roi, nthreads);
    }

    pvt::LoggedTimer logtime("IBA::rotate180");
    ROI src_roi      = roi.defined() ? roi : src.roi();
    ROI src_roi_full = src.roi_full();
    int xoffset      = src_roi.xbegin - src_roi_full.xbegin;
    int xstart       = src_roi_full.xend - xoffset - src_roi.width();
    int yoffset      = src_roi.ybegin - src_roi_full.ybegin;
    int ystart       = src_roi_full.yend - yoffset - src_roi.height();
    ROI dst_roi(xstart, xstart + src_roi.width(), ystart,
                ystart + src_roi.height(), src_roi.zbegin, src_roi.zend,
                src_roi.chbegin, src_roi.chend);
    ASSERT(dst_roi.width() == src_roi.width()
           && dst_roi.height() == src_roi.height());

    // Compute the destination ROI, it's the source ROI reflected across
    // the midline of the display window.
    if (!IBAprep(dst_roi, &dst, &src))
        return false;
    bool ok;
    OIIO_DISPATCH_COMMON_TYPES2(ok, "rotate180", rotate180_, dst.spec().format,
                                src.spec().format, dst, src, dst_roi, nthreads);
    return ok;
}



template<class D, class S = D>
static bool
rotate270_(ImageBuf& dst, const ImageBuf& src, ROI dst_roi, int nthreads)
{
    ROI dst_roi_full = dst.roi_full();
    ImageBuf::ConstIterator<S, D> s(src);
    ImageBuf::Iterator<D, D> d(dst, dst_roi);
    for (; !d.done(); ++d) {
        s.pos(dst_roi_full.yend - d.y() - 1, d.x(), d.z());
        for (int c = dst_roi.chbegin; c < dst_roi.chend; ++c)
            d[c] = s[c];
    }
    return true;
}


bool
ImageBufAlgo::rotate270(ImageBuf& dst, const ImageBuf& src, ROI roi,
                        int nthreads)
{
    if (&dst == &src) {  // Handle in-place operation
        ImageBuf tmp;
        tmp.swap(const_cast<ImageBuf&>(src));
        return rotate270(dst, tmp, roi, nthreads);
    }

    pvt::LoggedTimer logtime("IBA::rotate270");
    ROI src_roi      = roi.defined() ? roi : src.roi();
    ROI src_roi_full = src.roi_full();

    // Rotated full ROI swaps width and height, and keeps its origin
    // where the original origin was.
    ROI dst_roi_full(src_roi_full.xbegin,
                     src_roi_full.xbegin + src_roi_full.height(),
                     src_roi_full.ybegin,
                     src_roi_full.ybegin + src_roi_full.width(),
                     src_roi_full.zbegin, src_roi_full.zend,
                     src_roi_full.chbegin, src_roi_full.chend);

    ROI dst_roi(src_roi.ybegin, src_roi.yend, src_roi_full.xend - src_roi.xend,
                src_roi_full.xend - src_roi.xbegin, src_roi.zbegin,
                src_roi.zend, src_roi.chbegin, src_roi.chend);

    ASSERT(dst_roi.width() == src_roi.height()
           && dst_roi.height() == src_roi.width());

    bool dst_initialized = dst.initialized();
    if (!IBAprep(dst_roi, &dst, &src))
        return false;
    if (!dst_initialized)
        dst.set_roi_full(dst_roi_full);

    bool ok;
    OIIO_DISPATCH_COMMON_TYPES2(ok, "rotate270", rotate270_, dst.spec().format,
                                src.spec().format, dst, src, dst_roi, nthreads);
    return ok;
}



ImageBuf
ImageBufAlgo::rotate90(const ImageBuf& src, ROI roi, int nthreads)
{
    ImageBuf result;
    bool ok = rotate90(result, src, roi, nthreads);
    if (!ok && !result.has_error())
        result.error("ImageBufAlgo::rotate90() error");
    return result;
}



ImageBuf
ImageBufAlgo::rotate180(const ImageBuf& src, ROI roi, int nthreads)
{
    ImageBuf result;
    bool ok = rotate180(result, src, roi, nthreads);
    if (!ok && !result.has_error())
        result.error("ImageBufAlgo::rotate180() error");
    return result;
}



ImageBuf
ImageBufAlgo::rotate270(const ImageBuf& src, ROI roi, int nthreads)
{
    ImageBuf result;
    bool ok = rotate270(result, src, roi, nthreads);
    if (!ok && !result.has_error())
        result.error("ImageBufAlgo::rotate270() error");
    return result;
}



bool
ImageBufAlgo::reorient(ImageBuf& dst, const ImageBuf& src, int nthreads)
{
    ImageBuf tmp;
    bool ok = false;
    switch (src.orientation()) {
    case 1: ok = dst.copy(src); break;
    case 2: ok = ImageBufAlgo::flop(dst, src); break;
    case 3: ok = ImageBufAlgo::rotate180(dst, src); break;
    case 4: ok = ImageBufAlgo::flip(dst, src); break;
    case 5:
        ok = ImageBufAlgo::rotate270(tmp, src);
        if (ok)
            ok = ImageBufAlgo::flop(dst, tmp);
        else
            dst.error("%s", tmp.geterror());
        break;
    case 6: ok = ImageBufAlgo::rotate90(dst, src); break;
    case 7:
        ok = ImageBufAlgo::flip(tmp, src);
        if (ok)
            ok = ImageBufAlgo::rotate90(dst, tmp);
        else
            dst.error("%s", tmp.geterror());
        break;
    case 8: ok = ImageBufAlgo::rotate270(dst, src); break;
    }
    dst.set_orientation(1);
    return ok;
}



ImageBuf
ImageBufAlgo::reorient(const ImageBuf& src, int nthreads)
{
    ImageBuf result;
    bool ok = reorient(result, src, nthreads);
    if (!ok && !result.has_error())
        result.error("ImageBufAlgo::reorient() error");
    return result;
}



template<typename DSTTYPE, typename SRCTYPE = DSTTYPE>
static bool
transpose_(ImageBuf& dst, const ImageBuf& src, ROI roi, int nthreads)
{
    ImageBufAlgo::parallel_image(roi, nthreads, [&](ROI roi) {
        ImageBuf::ConstIterator<SRCTYPE, DSTTYPE> s(src, roi);
        ImageBuf::Iterator<DSTTYPE, DSTTYPE> d(dst);
        for (; !s.done(); ++s) {
            d.pos(s.y(), s.x(), s.z());
            if (!d.exists())
                continue;
            for (int c = roi.chbegin; c < roi.chend; ++c)
                d[c] = s[c];
        }
    });
    return true;
}



bool
ImageBufAlgo::transpose(ImageBuf& dst, const ImageBuf& src, ROI roi,
                        int nthreads)
{
    pvt::LoggedTimer logtime("IBA::transpose");
    if (!roi.defined())
        roi = get_roi(src.spec());
    roi.chend = std::min(roi.chend, src.nchannels());
    ROI dst_roi(roi.ybegin, roi.yend, roi.xbegin, roi.xend, roi.zbegin,
                roi.zend, roi.chbegin, roi.chend);
    bool dst_initialized = dst.initialized();
    if (!IBAprep(dst_roi, &dst))
        return false;
    if (!dst_initialized) {
        ROI r = src.roi_full();
        ROI dst_roi_full(r.ybegin, r.yend, r.xbegin, r.xend, r.zbegin, r.zend,
                         r.chbegin, r.chend);
        dst.set_roi_full(dst_roi_full);
    }
    bool ok;
    if (dst.spec().format == src.spec().format) {
        OIIO_DISPATCH_TYPES(ok, "transpose", transpose_, dst.spec().format, dst,
                            src, roi, nthreads);
    } else {
        OIIO_DISPATCH_COMMON_TYPES2(ok, "transpose", transpose_,
                                    dst.spec().format, src.spec().format, dst,
                                    src, roi, nthreads);
    }
    return ok;
}


ImageBuf
ImageBufAlgo::transpose(const ImageBuf& src, ROI roi, int nthreads)
{
    ImageBuf result;
    bool ok = transpose(result, src, roi, nthreads);
    if (!ok && !result.has_error())
        result.error("ImageBufAlgo::transpose() error");
    return result;
}

OIIO_NAMESPACE_END