#include "skunk-gate.h"

#if defined(SKUNK_4WAY)

#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include "algo/skein/skein-hash-4way.h"
#include "algo/gost/sph_gost.h"
#include "algo/fugue/sph_fugue.h"
#include "algo/cubehash/cubehash_sse2.h"

typedef struct {
    skein512_4way_context skein;
    cubehashParam         cube;
    sph_fugue512_context  fugue;
    sph_gost512_context   gost;
} skunk_4way_ctx_holder;

static __thread skunk_4way_ctx_holder skunk_4way_ctx;

void skunk_4way_hash( void *output, const void *input )
{
     uint64_t hash0[8] __attribute__ ((aligned (64)));
     uint64_t hash1[8] __attribute__ ((aligned (64)));
     uint64_t hash2[8] __attribute__ ((aligned (64)));
     uint64_t hash3[8] __attribute__ ((aligned (64)));
     uint64_t vhash[8*4] __attribute__ ((aligned (64)));

     skunk_4way_ctx_holder ctx __attribute__ ((aligned (64)));
     memcpy( &ctx, &skunk_4way_ctx, sizeof(skunk_4way_ctx) );

     skein512_4way( &ctx.skein, input, 80 );
     skein512_4way_close( &ctx.skein, vhash );
     mm256_deinterleave_4x64( hash0, hash1, hash2, hash3, vhash, 512 );

     cubehashUpdateDigest( &ctx.cube, (byte*) hash0, (const byte*)hash0, 64 );
     memcpy( &ctx.cube, &skunk_4way_ctx.cube, sizeof(cubehashParam) );
     cubehashUpdateDigest( &ctx.cube, (byte*)hash1, (const byte*) hash1, 64 );
     memcpy( &ctx.cube, &skunk_4way_ctx.cube, sizeof(cubehashParam) );
     cubehashUpdateDigest( &ctx.cube, (byte*)hash2, (const byte*) hash2, 64 );
     memcpy( &ctx.cube, &skunk_4way_ctx.cube, sizeof(cubehashParam) );
     cubehashUpdateDigest( &ctx.cube, (byte*)hash3, (const byte*) hash3, 64 );

     sph_fugue512( &ctx.fugue, hash0, 64 );
     sph_fugue512_close( &ctx.fugue, hash0 );
     sph_fugue512_init( &ctx.fugue );
     sph_fugue512( &ctx.fugue, hash1, 64 );
     sph_fugue512_close( &ctx.fugue, hash1 );
     sph_fugue512_init( &ctx.fugue );
     sph_fugue512( &ctx.fugue, hash2, 64 );
     sph_fugue512_close( &ctx.fugue, hash2 );
     sph_fugue512_init( &ctx.fugue );
     sph_fugue512( &ctx.fugue, hash3, 64 );
     sph_fugue512_close( &ctx.fugue, hash3 );

     sph_gost512( &ctx.gost, hash0, 64 );
     sph_gost512_close( &ctx.gost, hash0 );
     sph_gost512_init( &ctx.gost );
     sph_gost512( &ctx.gost, hash1, 64 );
     sph_gost512_close( &ctx.gost, hash1 );
     sph_gost512_init( &ctx.gost );
     sph_gost512( &ctx.gost, hash2, 64 );
     sph_gost512_close( &ctx.gost, hash2 );
     sph_gost512_init( &ctx.gost );
     sph_gost512( &ctx.gost, hash3, 64 );
     sph_gost512_close( &ctx.gost, hash3 );

     memcpy( output,    hash0, 32 );
     memcpy( output+32, hash1, 32 );
     memcpy( output+64, hash2, 32 );
     memcpy( output+96, hash3, 32 );
}

int scanhash_skunk_4way( int thr_id, struct work *work, uint32_t max_nonce,
                    uint64_t *hashes_done )
{
   uint32_t hash[4*8] __attribute__ ((aligned (64)));
   uint32_t vdata[24*4] __attribute__ ((aligned (64)));
   uint32_t endiandata[20] __attribute__((aligned(64)));
   uint32_t *pdata = work->data;
   uint32_t *ptarget = work->target;
   const uint32_t first_nonce = pdata[19];
   uint32_t n = first_nonce;
   uint32_t *nonces = work->nonces;
   int num_found = 0;
   uint32_t *noncep = vdata + 73;   // 9*8 + 1
   const uint32_t Htarg = ptarget[7];
   volatile uint8_t *restart = &(work_restart[thr_id].restart);

   if ( opt_benchmark )
      ((uint32_t*)ptarget)[7] = 0x0cff;
   for ( int k = 0; k < 19; k++ )
      be32enc( &endiandata[k], pdata[k] );

   uint64_t *edata = (uint64_t*)endiandata;
   mm256_interleave_4x64( (uint64_t*)vdata, edata, edata, edata, edata, 640 );
   do
   {
      be32enc( noncep,   n   );
      be32enc( noncep+2, n+1 );
      be32enc( noncep+4, n+2 );
      be32enc( noncep+6, n+3 );

      skunk_4way_hash( hash, vdata );
      pdata[19] = n;

      for ( int i = 0; i < 4; i++ )
      if ( (hash+(i<<3))[7] <= Htarg && fulltest( hash+(i<<3), ptarget ) )
      {
         pdata[19] = n+i;
         nonces[ num_found++ ] = n+i;
         work_set_target_ratio( work, hash+(i<<3) );
      }
      n +=4;
   } while ( ( num_found == 0 ) && ( n < max_nonce ) && !(*restart) );

   *hashes_done = n - first_nonce + 1;
   return num_found;
}

bool skunk_4way_thread_init()
{
   skein512_4way_init( &skunk_4way_ctx.skein );
   cubehashInit( &skunk_4way_ctx.cube, 512, 16, 32 );
   sph_fugue512_init( &skunk_4way_ctx.fugue );
   sph_gost512_init( &skunk_4way_ctx.gost );
   return true;
}

#endif