#include "vips.h"
#include <string.h>

#define VIPS_SUPPORT_AVIF_SPEED \
  (VIPS_MAJOR_VERSION > 8 || \
    (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION > 10) || \
    (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION >= 10 && VIPS_MICRO_VERSION >= 2))

#define VIPS_SUPPORT_AVIF_EFFORT \
  (VIPS_MAJOR_VERSION > 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION >= 12))

#define VIPS_SUPPORT_GIFSAVE \
  (VIPS_MAJOR_VERSION > 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION >= 12))

#define VIPS_GIF_RESOLUTION_LIMITED \
  (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION <= 12)

int
vips_initialize() {
  return vips_init("imgproxy");
}

void
clear_image(VipsImage **in) {
  if (G_IS_OBJECT(*in)) g_clear_object(in);
}

void
g_free_go(void **buf) {
  g_free(*buf);
}

void
swap_and_clear(VipsImage **in, VipsImage *out) {
  clear_image(in);
  *in = out;
}

int
gif_resolution_limit() {
#if VIPS_GIF_RESOLUTION_LIMITED
  // https://github.com/libvips/libvips/blob/v8.12.2/libvips/foreign/cgifsave.c#L437-L442
  return 2000 * 2000;
#else
  return INT_MAX / 4;
#endif
}

int
vips_jpegload_go(void *buf, size_t len, int shrink, VipsImage **out) {
  if (shrink > 1)
    return vips_jpegload_buffer(buf, len, out, "access", VIPS_ACCESS_SEQUENTIAL, "shrink", shrink, NULL);

  return vips_jpegload_buffer(buf, len, out, "access", VIPS_ACCESS_SEQUENTIAL, NULL);
}

int
vips_pngload_go(void *buf, size_t len, VipsImage **out) {
  return vips_pngload_buffer(buf, len, out, "access", VIPS_ACCESS_SEQUENTIAL, NULL);
}

int
vips_webpload_go(void *buf, size_t len, double scale, int pages, VipsImage **out) {
  return vips_webpload_buffer(
    buf, len, out,
    "access", VIPS_ACCESS_SEQUENTIAL,
    "scale", scale,
    "n", pages,
    NULL
  );
}

int
vips_gifload_go(void *buf, size_t len, int pages, VipsImage **out) {
  return vips_gifload_buffer(buf, len, out, "access", VIPS_ACCESS_SEQUENTIAL, "n", pages, NULL);
}

int
vips_svgload_go(void *buf, size_t len, double scale, VipsImage **out) {
  // libvips limits the minimal scale to 0.001, so we have to scale down dpi
  // for lower scale values
  double dpi = 72.0;
  if (scale < 0.001) {
    dpi *= VIPS_MAX(scale / 0.001, 0.001);
    scale = 0.001;
  }

  return vips_svgload_buffer(
    buf, len, out,
    "access", VIPS_ACCESS_SEQUENTIAL,
    "scale", scale,
    "dpi", dpi,
    NULL
  );
}

int
vips_heifload_go(void *buf, size_t len, VipsImage **out, int thumbnail) {
  return vips_heifload_buffer(
    buf, len, out,
    "access", VIPS_ACCESS_SEQUENTIAL,
    "thumbnail", thumbnail,
    NULL
  );
}

int
vips_tiffload_go(void *buf, size_t len, VipsImage **out) {
  return vips_tiffload_buffer(buf, len, out, "access", VIPS_ACCESS_SEQUENTIAL, NULL);
}

int
vips_black_go(VipsImage **out, int width, int height, int bands) {
  VipsImage *tmp;

  int res = vips_black(&tmp, width, height, "bands", bands, NULL) ||
    vips_copy(tmp, out, "interpretation", VIPS_INTERPRETATION_sRGB, NULL);

  clear_image(&tmp);

  return res;
}

int
vips_get_orientation(VipsImage *image) {
  int orientation;

  if (
    vips_image_get_typeof(image, VIPS_META_ORIENTATION) == G_TYPE_INT &&
    vips_image_get_int(image, VIPS_META_ORIENTATION, &orientation) == 0
  ) return orientation;

  return 1;
}

int
vips_get_palette_bit_depth(VipsImage *image) {
  int palette_bit_depth;

  if (
    vips_image_get_typeof(image, "palette-bit-depth") == G_TYPE_INT &&
    vips_image_get_int(image, "palette-bit-depth", &palette_bit_depth) == 0
  ) return palette_bit_depth;

  return 0;
}

VipsBandFormat
vips_band_format(VipsImage *in) {
  return in->BandFmt;
}

gboolean
vips_is_animated(VipsImage * in) {
  int n_pages;

  return( vips_image_get_typeof(in, "delay") != G_TYPE_INVALID &&
          vips_image_get_typeof(in, "loop") != G_TYPE_INVALID &&
          vips_image_get_typeof(in, "page-height") == G_TYPE_INT &&
          vips_image_get_typeof(in, "n-pages") == G_TYPE_INT &&
          vips_image_get_int(in, "n-pages", &n_pages) == 0 &&
          n_pages > 1 );
}

int
vips_image_get_array_int_go(VipsImage *image, const char *name, int **out, int *n) {
  return vips_image_get_array_int(image, name, out, n);
}

void
vips_image_set_array_int_go(VipsImage *image, const char *name, const int *array, int n) {
  vips_image_set_array_int(image, name, array, n);
}

int
vips_addalpha_go(VipsImage *in, VipsImage **out) {
  return vips_addalpha(in, out, NULL);
}

int
vips_premultiply_go(VipsImage *in, VipsImage **out) {
  if (!vips_image_hasalpha(in))
    return vips_copy(in, out, NULL);

  return vips_premultiply(in, out, NULL);
}

int
vips_unpremultiply_go(VipsImage *in, VipsImage **out) {
  if (!vips_image_hasalpha(in))
    return vips_copy(in, out, NULL);

  return vips_unpremultiply(in, out, NULL);
}

int
vips_copy_go(VipsImage *in, VipsImage **out) {
  return vips_copy(in, out, NULL);
}

int
vips_cast_go(VipsImage *in, VipsImage **out, VipsBandFormat format) {
  return vips_cast(in, out, format, NULL);
}

int
vips_rad2float_go(VipsImage *in, VipsImage **out) {
  return vips_rad2float(in, out, NULL);
}

int
vips_resize_go(VipsImage *in, VipsImage **out, double wscale, double hscale) {
  if (!vips_image_hasalpha(in))
    return vips_resize(in, out, wscale, "vscale", hscale, NULL);

  VipsBandFormat format = vips_band_format(in);

  VipsImage *base = vips_image_new();
  VipsImage **t = (VipsImage **) vips_object_local_array(VIPS_OBJECT(base), 3);

  int res =
    vips_premultiply(in, &t[0], NULL) ||
    vips_resize(t[0], &t[1], wscale, "vscale", hscale, NULL) ||
    vips_unpremultiply(t[1], &t[2], NULL) ||
    vips_cast(t[2], out, format, NULL);

  clear_image(&base);

  return 0;
}

int
vips_pixelate(VipsImage *in, VipsImage **out, int pixels) {
  VipsImage *base = vips_image_new();
  VipsImage **t = (VipsImage **) vips_object_local_array(VIPS_OBJECT(base), 3);

  int w, h, tw, th;

  w = in->Xsize;
  h = in->Ysize;

  tw = (int)((double)(w + pixels - 1) / pixels) * pixels;
  th = (int)((double)(h + pixels - 1) / pixels) * pixels;

  if (tw > w || th > h) {
    if (vips_embed(in, &t[0], 0, 0, tw, th, "extend", VIPS_EXTEND_COPY, NULL)) {
      clear_image(&base);
      return 1;
    }
  } else {
    if (vips_copy(in, &t[0], NULL)) {
      clear_image(&base);
      return 1;
    }
  }

  if (
    vips_shrink(t[0], &t[1], pixels, pixels, NULL) ||
    vips_zoom(t[1], &t[2], pixels, pixels, NULL)
  ) {
      clear_image(&base);
      return 1;
  }

  if (tw > w || th > h) {
    if (vips_extract_area(t[2], out, 0, 0, w, h, NULL)) {
        clear_image(&base);
        return 1;
    }
  } else {
    if (vips_copy(t[2], out, NULL)) {
        clear_image(&base);
        return 1;
    }
  }

  clear_image(&base);
  return 0;
}

int
vips_icc_is_srgb_iec61966(VipsImage *in) {
  const void *data;
  size_t data_len;

  // 1998-12-01
  static char date[] = { 7, 206, 0, 2, 0, 9 };
  // 2.1
  static char version[] = { 2, 16, 0, 0 };

  // The image had no profile and built-in CMYK was imported.
  // Vips gives us an invalid data pointer when the built-in profile was imported,
  // so we check this mark before receiving an actual profile.
  // if (vips_image_get_typeof(in, "icc-cmyk-no-profile"))
  //   return FALSE;

  if (vips_image_get_blob(in, VIPS_META_ICC_NAME, &data, &data_len))
    return FALSE;

  // Less than header size
  if (data_len < 128)
    return FALSE;

  // Predict it is sRGB IEC61966 2.1 by checking some header fields
  return ((memcmp(data + 48, "IEC ",  4) == 0) && // Device manufacturer
          (memcmp(data + 52, "sRGB",  4) == 0) && // Device model
          (memcmp(data + 80, "HP  ",  4) == 0) && // Profile creator
          (memcmp(data + 24, date,    6) == 0) && // Date of creation
          (memcmp(data + 8,  version, 4) == 0));  // Version
}

int
vips_has_embedded_icc(VipsImage *in) {
  return vips_image_get_typeof(in, VIPS_META_ICC_NAME) != 0;
}

int
vips_icc_import_go(VipsImage *in, VipsImage **out) {
  return vips_icc_import(in, out, "embedded", TRUE, "pcs", VIPS_PCS_LAB, NULL);
}

int
vips_icc_export_go(VipsImage *in, VipsImage **out) {
  return vips_icc_export(in, out, "pcs", VIPS_PCS_LAB, NULL);
}

int
vips_icc_export_srgb(VipsImage *in, VipsImage **out) {
  return vips_icc_export(in, out, "output_profile", "sRGB", "pcs", VIPS_PCS_LAB, NULL);
}

int
vips_icc_transform_go(VipsImage *in, VipsImage **out) {
  return vips_icc_transform(in, out, "sRGB", "embedded", TRUE, "pcs", VIPS_PCS_LAB, NULL);
}

int
vips_icc_remove(VipsImage *in, VipsImage **out) {
  if (vips_copy(in, out, NULL)) return 1;

  vips_image_remove(*out, VIPS_META_ICC_NAME);

  return 0;
}

int
vips_colourspace_go(VipsImage *in, VipsImage **out, VipsInterpretation cs) {
  return vips_colourspace(in, out, cs, NULL);
}

int
vips_rot_go(VipsImage *in, VipsImage **out, VipsAngle angle) {
  return vips_rot(in, out, angle, NULL);
}

int
vips_flip_horizontal_go(VipsImage *in, VipsImage **out) {
  return vips_flip(in, out, VIPS_DIRECTION_HORIZONTAL, NULL);
}

int
vips_smartcrop_go(VipsImage *in, VipsImage **out, int width, int height) {
  return vips_smartcrop(in, out, width, height, NULL);
}

int
vips_gaussblur_go(VipsImage *in, VipsImage **out, double sigma) {
  return vips_gaussblur(in, out, sigma, NULL);
}

int
vips_sharpen_go(VipsImage *in, VipsImage **out, double sigma) {
  return vips_sharpen(in, out, "sigma", sigma, NULL);
}

int
vips_flatten_go(VipsImage *in, VipsImage **out, double r, double g, double b) {
  if (!vips_image_hasalpha(in))
    return vips_copy(in, out, NULL);

  VipsArrayDouble *bg = vips_array_double_newv(3, r, g, b);
  int res = vips_flatten(in, out, "background", bg, NULL);
  vips_area_unref((VipsArea *)bg);
  return res;
}

int
vips_extract_area_go(VipsImage *in, VipsImage **out, int left, int top, int width, int height) {
  return vips_extract_area(in, out, left, top, width, height, NULL);
}

int
vips_trim(VipsImage *in, VipsImage **out, double threshold,
          gboolean smart, double r, double g, double b,
          gboolean equal_hor, gboolean equal_ver) {

  VipsImage *base = vips_image_new();
  VipsImage **t = (VipsImage **) vips_object_local_array(VIPS_OBJECT(base), 2);

  VipsImage *tmp = in;

  if (vips_image_guess_interpretation(in) != VIPS_INTERPRETATION_sRGB) {
    if (vips_colourspace(in, &t[0], VIPS_INTERPRETATION_sRGB, NULL)) {
      clear_image(&base);
      return 1;
    }
    tmp = t[0];
  }

  if (vips_image_hasalpha(tmp)) {
    if (vips_flatten_go(tmp, &t[1], 255.0, 0, 255.0)) {
      clear_image(&base);
      return 1;
    }
    tmp = t[1];
  }

  double *bg = NULL;
  int bgn;
  VipsArrayDouble *bga;

  if (smart) {
    if (vips_getpoint(tmp, &bg, &bgn, 0, 0, NULL)) {
      clear_image(&base);
      return 1;
    }
    bga = vips_array_double_new(bg, bgn);
  } else {
    bga = vips_array_double_newv(3, r, g, b);
  }

  int left, right, top, bot, width, height, diff;
  int res = vips_find_trim(tmp, &left, &top, &width, &height, "background", bga, "threshold", threshold, NULL);

  clear_image(&base);
  vips_area_unref((VipsArea *)bga);
  g_free(bg);

  if (res) {
    return 1;
  }

  if (equal_hor) {
    right = in->Xsize - left - width;
    diff = right - left;
    if (diff > 0) {
      width += diff;
    } else if (diff < 0) {
      left = right;
      width -= diff;
    }
  }

  if (equal_ver) {
    bot = in->Ysize - top - height;
    diff = bot - top;
    if (diff > 0) {
      height += diff;
    } else if (diff < 0) {
      top = bot;
      height -= diff;
    }
  }

  if (width == 0 || height == 0) {
    return vips_copy(in, out, NULL);
  }

  return vips_extract_area(in, out, left, top, width, height, NULL);
}

int
vips_replicate_go(VipsImage *in, VipsImage **out, int width, int height) {
  VipsImage *tmp;

  if (vips_replicate(in, &tmp, 1 + width / in->Xsize, 1 + height / in->Ysize, NULL))
    return 1;

  if (vips_extract_area(tmp, out, 0, 0, width, height, NULL)) {
    clear_image(&tmp);
    return 1;
  }

  clear_image(&tmp);

  return 0;
}

int
vips_embed_go(VipsImage *in, VipsImage **out, int x, int y, int width, int height) {
  VipsImage *tmp;

  int ret =
    vips_ensure_alpha(in, &tmp) ||
    vips_embed(tmp, out, x, y, width, height, "extend", VIPS_EXTEND_BLACK, NULL);

  clear_image(&tmp);

  return ret;
}

int
vips_ensure_alpha(VipsImage *in, VipsImage **out) {
  if (vips_image_hasalpha(in))
    return vips_copy(in, out, NULL);

  return vips_bandjoin_const1(in, out, 255, NULL);
}

int
vips_apply_watermark(VipsImage *in, VipsImage *watermark, VipsImage **out, double opacity) {
  VipsImage *base = vips_image_new();
  VipsImage **t = (VipsImage **) vips_object_local_array(VIPS_OBJECT(base), 6);

  if (vips_ensure_alpha(watermark, &t[0])) {
    clear_image(&base);
    return 1;
  }

  if (opacity < 1) {
    if (
      vips_extract_band(t[0], &t[1], 0, "n", t[0]->Bands - 1, NULL) ||
      vips_extract_band(t[0], &t[2], t[0]->Bands - 1, "n", 1, NULL) ||
      vips_linear1(t[2], &t[3], opacity, 0, NULL) ||
      vips_bandjoin2(t[1], t[3], &t[4], NULL)
    ) {
      clear_image(&base);
      return 1;
    }
  } else {
    if (vips_copy(t[0], &t[4], NULL)) {
      clear_image(&base);
      return 1;
    }
  }

  int res =
    vips_composite2(in, t[4], &t[5], VIPS_BLEND_MODE_OVER, "compositing_space", in->Type, NULL) ||
    vips_cast(t[5], out, vips_image_get_format(in), NULL);

  clear_image(&base);

  return res;
}

int
vips_arrayjoin_go(VipsImage **in, VipsImage **out, int n) {
  return vips_arrayjoin(in, out, n, "across", 1, NULL);
}

int
vips_strip(VipsImage *in, VipsImage **out, int keep_exif_copyright) {
  static double default_resolution = 72.0 / 25.4;

  if (vips_copy(
    in, out,
    "xres", default_resolution,
    "yres", default_resolution,
    NULL
  )) return 1;

  gchar **fields = vips_image_get_fields(in);

  for (int i = 0; fields[i] != NULL; i++) {
    gchar *name = fields[i];

    if (strcmp(name, VIPS_META_ICC_NAME) == 0) continue;
    if (strcmp(name, "palette-bit-depth") == 0) continue;

    if (keep_exif_copyright) {
      if (strcmp(name, VIPS_META_EXIF_NAME) == 0) continue;
      if (strcmp(name, "exif-ifd0-Copyright") == 0) continue;
      if (strcmp(name, "exif-ifd0-Artist") == 0) continue;
    }

    vips_image_remove(*out, name);
  }

  g_strfreev(fields);

  return 0;
}

int
vips_jpegsave_go(VipsImage *in, void **buf, size_t *len, int quality, int interlace) {
  return vips_jpegsave_buffer(
    in, buf, len,
    "Q", quality,
    "optimize_coding", TRUE,
    "interlace", interlace,
    NULL
  );
}

int
vips_pngsave_go(VipsImage *in, void **buf, size_t *len, int interlace, int quantize, int colors) {
  int bitdepth;

  if (quantize) {
    bitdepth = 1;
    if (colors > 16) bitdepth = 8;
    else if (colors > 4) bitdepth = 4;
    else if (colors > 2) bitdepth = 2;
  } else {
    bitdepth = vips_get_palette_bit_depth(in);
    if (bitdepth) {
      if (bitdepth > 4) bitdepth = 8;
      else if (bitdepth > 2) bitdepth = 4;
      quantize = 1;
      colors = 1 << bitdepth;
    }
  }

  if (!quantize)
    return vips_pngsave_buffer(
      in, buf, len,
      "filter", VIPS_FOREIGN_PNG_FILTER_NONE,
      "interlace", interlace,
      NULL
    );

  return vips_pngsave_buffer(
    in, buf, len,
    "filter", VIPS_FOREIGN_PNG_FILTER_NONE,
    "interlace", interlace,
    "palette", quantize,
    "bitdepth", bitdepth,
    NULL
  );
}

int
vips_webpsave_go(VipsImage *in, void **buf, size_t *len, int quality) {
  return vips_webpsave_buffer(
    in, buf, len,
    "Q", quality,
    NULL
  );
}

int
vips_gifsave_go(VipsImage *in, void **buf, size_t *len) {
#if VIPS_SUPPORT_GIFSAVE
  return vips_gifsave_buffer(in, buf, len, NULL);
#else
  vips_error("vips_gifsave_go", "Saving GIF is not supported (libvips 8.12+ reuired)");
  return 1;
#endif
}

int
vips_tiffsave_go(VipsImage *in, void **buf, size_t *len, int quality) {
  return vips_tiffsave_buffer(in, buf, len, "Q", quality, NULL);
}

int
vips_avifsave_go(VipsImage *in, void **buf, size_t *len, int quality, int speed) {
  return vips_heifsave_buffer(
    in, buf, len,
    "Q", quality,
    "compression", VIPS_FOREIGN_HEIF_COMPRESSION_AV1,
  #if VIPS_SUPPORT_AVIF_EFFORT
    "effort", 9-speed,
  #elif VIPS_SUPPORT_AVIF_SPEED
    "speed", speed,
  #endif
    NULL);
}

void
vips_cleanup() {
  vips_error_clear();
  vips_thread_shutdown();
}