#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <math.h>

#include "config.h"
#include "mp_msg.h"
#include "cpudetect.h"

#include "img_format.h"
#include "mp_image.h"
#include "vf.h"

#include "libvo/video_out.h"

#include "m_option.h"
#include "m_struct.h"

static struct vf_priv_s {
	uint8_t *buf[2];
	float hue;
	float saturation;
} const vf_priv_dflt = {
  {NULL, NULL},
  0.0,
  1.0,
};

static void process_C(uint8_t *udst, uint8_t *vdst, uint8_t *usrc, uint8_t *vsrc, int dststride, int srcstride,
		    int w, int h, float hue, float sat)
{
	int i;
	const int s= rint(sin(hue) * (1<<16) * sat);
	const int c= rint(cos(hue) * (1<<16) * sat);

	while (h--) {
		for (i = 0; i<w; i++)
		{
			const int u= usrc[i] - 128;
			const int v= vsrc[i] - 128;
			int new_u= (c*u - s*v + (1<<15) + (128<<16))>>16;
			int new_v= (s*u + c*v + (1<<15) + (128<<16))>>16;
			if(new_u & 768) new_u= (-new_u)>>31;
			if(new_v & 768) new_v= (-new_v)>>31;
			udst[i]= new_u;
			vdst[i]= new_v;
		}
		usrc += srcstride;
		vsrc += srcstride;
		udst += dststride;
		vdst += dststride;
	}
}

static void (*process)(uint8_t *udst, uint8_t *vdst, uint8_t *usrc, uint8_t *vsrc, int dststride, int srcstride,
		    int w, int h, float hue, float sat);

/* FIXME: add packed yuv version of process */

static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts)
{
	mp_image_t *dmpi;

	dmpi=vf_get_image(vf->next, mpi->imgfmt,
			  MP_IMGTYPE_EXPORT, 0,
			  mpi->w, mpi->h);
	
	dmpi->planes[0] = mpi->planes[0];
	dmpi->stride[0] = mpi->stride[0];
	dmpi->stride[1] = mpi->stride[1];
	dmpi->stride[2] = mpi->stride[2];

	if (!vf->priv->buf[0]){
		vf->priv->buf[0] = malloc(mpi->stride[1]*mpi->h >> mpi->chroma_y_shift);
		vf->priv->buf[1] = malloc(mpi->stride[2]*mpi->h >> mpi->chroma_y_shift);
	}
	
	if (vf->priv->hue == 0 && vf->priv->saturation == 1){
		dmpi->planes[1] = mpi->planes[1];
		dmpi->planes[2] = mpi->planes[2];
	}else {
		dmpi->planes[1] = vf->priv->buf[0];
		dmpi->planes[2] = vf->priv->buf[1];
		process(dmpi->planes[1], dmpi->planes[2],
			mpi->planes[1], mpi->planes[2],
			dmpi->stride[1],mpi->stride[1],
			mpi->w>> mpi->chroma_x_shift, mpi->h>> mpi->chroma_y_shift, 
			vf->priv->hue, vf->priv->saturation);
	}

	return vf_next_put_image(vf,dmpi, pts);
}

static int control(struct vf_instance_s* vf, int request, void* data)
{
	vf_equalizer_t *eq;

	switch (request) {
	case VFCTRL_SET_EQUALIZER:
		eq = data;
		if (!strcmp(eq->item,"hue")) {
			vf->priv->hue = eq->value * M_PI / 100;
			return CONTROL_TRUE;
		} else if (!strcmp(eq->item,"saturation")) {
			vf->priv->saturation = (eq->value + 100)/100.0;
			return CONTROL_TRUE;
		}
		break;
	case VFCTRL_GET_EQUALIZER:
		eq = data;
		if (!strcmp(eq->item,"hue")) {
			eq->value = rint(vf->priv->hue *100 / M_PI);
			return CONTROL_TRUE;
		}else if (!strcmp(eq->item,"saturation")) {
			eq->value = rint(vf->priv->saturation*100 - 100);
			return CONTROL_TRUE;
		}
		break;
	}
	return vf_next_control(vf, request, data);
}

static int query_format(struct vf_instance_s* vf, unsigned int fmt)
{
	switch (fmt) {
	case IMGFMT_YVU9:
	case IMGFMT_IF09:
	case IMGFMT_YV12:
	case IMGFMT_I420:
	case IMGFMT_IYUV:
	case IMGFMT_CLPL:
	case IMGFMT_444P:
	case IMGFMT_422P:
	case IMGFMT_411P:
		return vf_next_query_format(vf, fmt);
	}
	return 0;
}

static void uninit(struct vf_instance_s* vf)
{
	if (vf->priv->buf[0]) free(vf->priv->buf[0]);
	if (vf->priv->buf[1]) free(vf->priv->buf[1]);
	free(vf->priv);
}

static int open(vf_instance_t *vf, char* args)
{
	vf->control=control;
	vf->query_format=query_format;
	vf->put_image=put_image;
	vf->uninit=uninit;
	
	if(!vf->priv) {
	vf->priv = malloc(sizeof(struct vf_priv_s));
	memset(vf->priv, 0, sizeof(struct vf_priv_s));
	}
	if (args) sscanf(args, "%f:%f", &vf->priv->hue, &vf->priv->saturation);
        vf->priv->hue *= M_PI / 180.0;

	process = process_C;
	return 1;
}

#define ST_OFF(f) M_ST_OFF(struct vf_priv_s,f)
static m_option_t vf_opts_fields[] = {
  {"hue", ST_OFF(hue), CONF_TYPE_FLOAT, M_OPT_RANGE,-180.0 ,180.0, NULL},
  {"saturation", ST_OFF(saturation), CONF_TYPE_FLOAT, M_OPT_RANGE,-10.0 ,10.0, NULL},
  { NULL, NULL, 0, 0, 0, 0,  NULL }
};

static m_struct_t vf_opts = {
  "hue",
  sizeof(struct vf_priv_s),
  &vf_priv_dflt,
  vf_opts_fields
};

const vf_info_t vf_info_hue = {
	"hue changer",
	"hue",
	"Michael Niedermayer",
	"",
	open,
	&vf_opts
};

