/* exercises the demux + animation API folded into the single header */
#include <stdio.h>
#include <stdlib.h>

#define WEBPDEC_IMPLEMENTATION
#include "webpdec.h"

static unsigned char* slurp(const char* p, size_t* n){
  FILE* f=fopen(p,"rb"); if(!f) return 0;
  fseek(f,0,SEEK_END); long L=ftell(f); fseek(f,0,SEEK_SET);
  unsigned char* b=malloc(L); if(fread(b,1,L,f)!=(size_t)L){} fclose(f); *n=L; return b;
}

int main(int argc,char**argv){
  size_t n; unsigned char* buf=slurp(argv[1],&n);
  if(!buf){ printf("no file\n"); return 1; }

  WebPData data = { buf, n };

  /* --- demux: report canvas + frame/loop count --- */
  WebPDemuxer* dmux = WebPDemux(&data);
  if(!dmux){ printf("WebPDemux failed\n"); return 1; }
  unsigned cw = WebPDemuxGetI(dmux, WEBP_FF_CANVAS_WIDTH);
  unsigned ch = WebPDemuxGetI(dmux, WEBP_FF_CANVAS_HEIGHT);
  unsigned nf = WebPDemuxGetI(dmux, WEBP_FF_FRAME_COUNT);
  unsigned lp = WebPDemuxGetI(dmux, WEBP_FF_LOOP_COUNT);
  unsigned fl = WebPDemuxGetI(dmux, WEBP_FF_FORMAT_FLAGS);
  printf("demux: canvas=%ux%u frames=%u loop=%u flags=0x%x\n", cw,ch,nf,lp,fl);
  WebPDemuxDelete(dmux);

  /* --- animation: decode every frame via WebPAnimDecoder --- */
  WebPAnimDecoderOptions opt;
  WebPAnimDecoderOptionsInit(&opt);
  opt.color_mode = MODE_RGBA;
  WebPAnimDecoder* adec = WebPAnimDecoderNew(&data, &opt);
  if(!adec){ printf("WebPAnimDecoderNew failed\n"); return 1; }
  WebPAnimInfo info;
  WebPAnimDecoderGetInfo(adec, &info);
  printf("anim: %ux%u frames=%u loops=%u bgcolor=0x%08x\n",
         info.canvas_width, info.canvas_height, info.frame_count,
         info.loop_count, info.bgcolor);
  int prev = 0, got = 0;
  while (WebPAnimDecoderHasMoreFrames(adec)) {
    uint8_t* frgba; int ts;
    if (!WebPAnimDecoderGetNext(adec, &frgba, &ts)) { printf("GetNext failed\n"); break; }
    long c = ((long)info.canvas_height/2*info.canvas_width + info.canvas_width/2)*4;
    printf("  frame %d  ts=%dms (+%dms)  centerRGBA=%d,%d,%d,%d\n",
           got, ts, ts-prev, frgba[c],frgba[c+1],frgba[c+2],frgba[c+3]);
    prev = ts; got++;
  }
  printf("decoded %d/%u frames -> %s\n", got, info.frame_count,
         (got==(int)info.frame_count)?"OK":"MISMATCH");
  WebPAnimDecoderDelete(adec);
  free(buf);
  return 0;
}